Cross Reference: /src/sys/kern/kern

History log of /src/sys/kern/kern_proc.c
Revision	Date	Author	Comments
1.280	02-Jun-2025	andvar	s/pratical/practical/ in comments.
1.279	17-Mar-2025	riastradh	kern_proc.c: Fix mistakes in SET_ERROR sprinkling. To avoid triggering a SET_ERROR probe, I moved an initial rval = EPERM; to a separate label `eperm', and then adjusted all the `goto done' lines that didn't initialize rval themselves to do `goto eperm' instead. However, I was sloppy and missed some cases, so some spuriously failed when they should have succeeded. Annoyingly, we don't seem to have any automatic tests for this bug! So the releng test bed hasn't discovered the problem.
1.278	16-Mar-2025	riastradh	kern_proc.c: Sprinkle SET_ERROR.
1.277	16-Mar-2025	riastradh	kern_proc.c: Sort includes. No functional change intended.
1.276	14-Jul-2024	kre	PR kern/58425 -- Disallow INT_MIN as a (negative) pid arg. Since -INT_MIN is undefined, and to point of negative pid args is to negate them, and use the result as a pgrp id instead, we need to avoid accidentally negating INT_MIN. Since pid_t is just an integral type, of unspecified width, when testing pid_t value test for <= INT_MIN (or > INT_MIN sometimes) rather than == INT_MIN. When testing int values, just == INT_MIN is all that is needed, < INT_MIN cannot occur. XXX pullup -9, -10
1.275	02-Jun-2024	andvar	Fix various typos, mainly triple letters.
1.274	05-Oct-2023	ad	Arrange to update cached LWP credentials in userret() rather than during syscall/trap entry, eliminating a test+branch on every syscall/trap. This wasn't possible in the 3.99.x timeframe when l->l_cred came about because there wasn't a reliable/timely way to force an ONPROC LWP running on a remote CPU into the kernel (which is just about the only new thing in this scheme).
1.273	04-Oct-2023	ad	kauth_cred_hold(): return cred verbatim so that donating a reference to another data structure can be done more elegantly.
1.272	04-Oct-2023	ad	Eliminate l->l_ncsw and l->l_nivcsw. From memory think they were added before we had per-LWP struct rusage; the same is now tracked there.
1.271	04-Sep-2023	simonb	Whitespace nit.
1.270	09-Apr-2023	riastradh	kern: KASSERT(A && B) -> KASSERT(A); KASSERT(B)
1.269	26-Oct-2022	riastradh	branches: 1.269.2; kern/exec_elf.c: Get emul_netbsd from sys/proc.h.
1.268	01-Jul-2022	riastradh	kern: Omit stale locking comment in proc_crmod_leave.
1.267	07-May-2022	mrg	bump maxthreads default. bump the default MAXLWP to 4096 from 2048, and adjust the default limits seen to be 2048 cur / 4096 max. remove the linkage to maxuprc entirely. remove cpu_maxlwp() that isn't implemented anywhere. instead, grow the maxlwp for larger memory systems, picking 1 lwp per 1MiB of ram, limited to 65535 like the system limit. remove some magic numbers. i've been having weird firefox issues for a few months now and it turns out i was having pthread_create() failures and since bumping the defaults i've had none of the recent issues.
1.266	07-Apr-2022	andvar	fix various typos in comments.
1.265	13-Mar-2022	riastradh	kern: Fix ordering of loads for pid_table and pid_tbl_mask. This introduces a load-acquire where there was none before. This is a simple correctness change. We could avoid the load-acquire, and use only load-consume, if we used a pointer indirection for _both_ pid_table and pid_tbl_mask. Takes a little more work, and probably costs an additional cache line of memory traffic, but might be worth it to avoid the load-acquire for pid lookup. Reported-by: syzbot+c49e405d0b977aeed663@syzkaller.appspotmail.com Reported-by: syzbot+1c88ee7086f93607cea1@syzkaller.appspotmail.com Reported-by: syzbot+da4e9ed1319b75fe2ef3@syzkaller.appspotmail.com
1.264	10-Mar-2022	riastradh	kern: Use atomic_store_release/atomic_load_consume for pid_table. This is read without the lock, so ordering is required.
1.263	12-Feb-2022	thorpej	Add inline functions to manipulate the klists that link up knotes via kn_selnext: - klist_init() - klist_fini() - klist_insert() - klist_remove() These provide some API insulation from the implementation details of these lists (but not completely; see vn_knote_attach() and vn_knote_detach()). Currently just a wrapper around SLIST(9). This will make it significantly easier to switch kn_selnext linkage to a different kind of list.
1.262	24-Dec-2020	nia	Avoid negating the minimum size of pid_t (this overflows). Reported-by: syzbot+e2eb02f9dfaf4f2e6626@syzkaller.appspotmail.com
1.261	17-Sep-2020	martin	branches: 1.261.2; PR kern/55665: temporarily comment out an assertion that is known to trigger in some conditions (where ignoring the wrap around does no harm for now)
1.260	05-Sep-2020	riastradh	Round of uvm.h cleanup. The poorly named uvm.h is generally supposed to be for uvm-internal users only. - Narrow it to files that actually need it -- mostly files that need to query whether curlwp is the pagedaemon, which should maybe be exposed by an external header. - Use uvm_extern.h where feasible and uvm_*.h for things not exposed by it. We should split up uvm_extern.h but this will serve for now to reduce the uvm.h dependencies. - Use uvm_stat.h and #ifdef UVMHIST uvm.h for files that use UVMHIST(ubchist), since ubchist is declared in uvm.h but the reference evaporates if UVMHIST is not defined, so we reduce header file dependencies. - Make uvm_device.h and uvm_swap.h independently includable while here. ok chs@
1.259	28-Aug-2020	riastradh	Fix pasto in previous -- pass the right size to memset...
1.258	28-Aug-2020	riastradh	Nix trailing whitespace.
1.257	28-Aug-2020	riastradh	Zero out more lock snapshots in sysctl exposure.
1.256	26-Aug-2020	christos	Instead of returning 0 when sysctl kern.expose_address=0, return a random hashed value of the data. This allows sockstat to work without exposing kernel addresses or being setgid kmem.
1.255	11-Jun-2020	ad	uvm_availmem(): give it a boolean argument to specify whether a recent cached value will do, or if the very latest total must be fetched. It can be called thousands of times a second and fetching the totals impacts not only the calling LWP but other CPUs doing unrelated activity in the VM system.
1.254	26-May-2020	kamil	Catch up with the usage of struct vmspace::vm_refcnt Use the dedicated reference counting routines. Change the type of struct vmspace::vm_refcnt and struct vm_map::ref_count to volatile. Remove the unnecessary vm->vm_map.misc_lock locking in process_domem(). Reviewed by <ad>
1.253	23-May-2020	ad	Move proc_lock into the data segment. It was dynamically allocated because at the time we had mutex_obj_alloc() but not __cacheline_aligned.
1.252	23-May-2020	ad	- Replace pid_table_lock with a lockless lookup covered by pserialize, with the "writer" side being pid_table expansion. The basic idea is that when doing an LWP lookup there is usually already a lock held (p->p_lock), or a spin mutex that needs to be taken (l->l_mutex), and either can be used to get the found LWP stable and confidently determine that all is correct. - For user processes LSLARVAL implies the same thing as LSIDL ("not visible by ID"), and lookup by ID in proc0 doesn't really happen. In-tree the new state should be understood by top(1), the tty subsystem and so on, and would attract the attention of 3rd party kernel grovellers in time, so remove it and just rely on LSIDL.
1.251	29-Apr-2020	thorpej	- proc_find() retains traditional semantics of requiring the canonical PID to look up a proc. Add a separate proc_find_lwpid() to look up a proc by the ID of any of its LWPs. - Add proc_find_lwp_acquire_proc(), which enables looking up the LWP and a proc given the ID of any LWP. Returns with the proc::p_lock held. - Rewrite lwp_find2() in terms of proc_find_lwp_acquire_proc(), and add allow the proc to be wildcarded, rather than just curproc or specific proc. - lwp_find2() now subsumes the original intent of lwp_getref_lwpid(), but in a much nicer way, so garbage-collect the remnants of that recently added mechanism.
1.250	26-Apr-2020	thorpej	Add a NetBSD native futex implementation, mostly written by riastradh@. Map the COMPAT_LINUX futex calls to the native ones.
1.249	26-Apr-2020	thorpej	In expand_pid_table(), calculate the current pid table size before releasing the lock.
1.248	24-Apr-2020	thorpej	Make sure PT_F_* bits are uintptr_t.
1.247	24-Apr-2020	thorpej	Overhaul the way LWP IDs are allocated. Instead of each LWP having it's own LWP ID space, LWP IDs came from the same number space as PIDs. The lead LWP of a process gets the PID as its LID. If a multi-LWP process's lead LWP exits, the PID persists for the process. In addition to providing system-wide unique thread IDs, this also lets us eliminate the per-process LWP radix tree, and some associated locks. Remove the separate "global thread ID" map added previously; it is no longer needed to provide this functionality. Nudged in this direction by ad@ and chs@.
1.246	21-Apr-2020	ad	Revert the changes made in February to make cwdinfo use mostly lockless, which relied on taking extra vnode refs. Having benchmarked various experimental changes over the past few months it seems that it's better to avoid vnode refs as much as possible. cwdi_lock as a RW lock already did that to some extent for getcwd() and will permit the same for namei() too.
1.245	20-Apr-2020	maxv	Add three KASSERTs, to detect refcount bugs. This narrows down an unknown bug in some place near, that has manifested itself in various forms (use-after-frees, uninit accesses, page faults, segmentation faults), all pointed out by syzbot. The first KASSERT in fixjobc() fires when the bug is encountered.
1.244	19-Apr-2020	thorpej	- Only increment nprocs when we're creating a new process, not just when allocating a PID. - Per above, proc_free_pid() no longer decrements nprocs. It's now done in proc_free() right after proc_free_pid(). - Ensure nprocs is accessed using atomics everywhere.
1.243	06-Apr-2020	kamil	branches: 1.243.2; Reintroduce struct proc::p_oppid Relying on p_opptr is not safe as there is a race between: - spawner giving a birth to a child process and being killed - spawnee accessng p_opptr and reporting TRAP_CHLD PR kern/54786 by Andreas Gustafsson
1.242	23-Feb-2020	ad	Merge from ad-namecache: - Have a stab at clustering the members of vnode_t and vnode_impl_t in a more cache-conscious way. With that done, go back to adjusting v_usecount with atomics and keep vi_lock directly in vnode_impl_t (saves KVA). - Allow VOP_LOCK(LK_NONE) for the benefit of VFS_VGET() and VFS_ROOT(). Make sure LK_UPGRADE always comes with LK_NOWAIT. - Make cwdinfo use mostly lockless.
1.241	21-Feb-2020	joerg	Explicitly cast pointers to uintptr_t before casting to enums. They are not necessarily the same size. Don't cast pointers to bool, check for NULL instead.
1.240	29-Jan-2020	ad	- Track LWPs in a per-process radixtree. It uses no extra memory in the single threaded case. Replace scans of p->p_lwps with lookups in the tree. Find free LIDs for new LWPs in the tree. Replace the hashed sleep queues for park/unpark with lookups in the tree under cover of a RW lock. - lwp_wait(): if waiting on a specific LWP, find the LWP via tree lookup and return EINVAL if it's detached, not ESRCH. - Group the locks in struct proc at the end of the struct in their own cache line. - Add some comments.
1.239	31-Dec-2019	ad	branches: 1.239.2; Rename uvm_free() -> uvm_availmem().
1.238	21-Dec-2019	ad	uvmexp.free -> uvm_free()
1.237	06-Dec-2019	kamil	Correct signals in siglist+sigmask passed in kinfo_lwp Make the union of LWP and PROC pending signals correctly.
1.236	12-Oct-2019	kamil	Remove p_oppid from struct proc This field is not needed as it duplicated p_opptr that is alread safe to use, unless proven otherwise. eventswitch() already contained a check for != initproc (pid1). Ride ABI bump for 9.99.16.
1.235	30-Sep-2019	kamil	Move TRAP_CHLD/TRAP_LWP ptrace information from struct proc to siginfo Storing struct ptrace_state information inside struct proc was vulnerable to synchronization bugs, as multiple events emitted in the same time were overwritting other ones. Cache the original parent process id in p_oppid. Reusing here p_opptr is in theory prone to slight race codition. Change the semantics of PT_GET_PROCESS_STATE, reutning EINVAL for calls prompting for the value in cases when there wasn't registered an appropriate event. Add an alternative approach to check the ptrace_state information, directly from the siginfo_t value returned from PT_GET_SIGINFO. The original PT_GET_PROCESS_STATE approach is kept for compat with older NetBSD and OpenBSD. New code is recommended to keep using PT_GET_PROCESS_STATE. Add a couple of compile-time asserts for assumptions in the code. No functional change intended in existing ptrace(2) software. All ATF ptrace(2) and ATF GDB tests pass. This change improves reliability of the threading ptrace(2) code.
1.234	02-Aug-2019	kamil	Update our vm resource use for sysctl(3) call reading kinfo_proc* Without this change RSS properties are zeroed unless a process exits or calls getrusage(2).
1.233	11-Jun-2019	kamil	branches: 1.233.2; Add support for PTRACE_POSIX_SPAWN to report posix_spawn(3) events posix_spawn(3) is a first class syscall in NetBSD, different to (V)FORK+EXEC as these operations are executed in one go. This differs to Linux and FreeBSD, where posix_spawn(3) is implemented with existing kernel primitives (clone(2), vfork(2), exec(3)) inside libc. Typically LLDB and GDB software is aware of FORK/VFORK events. As discussed with the LLDB community, instead of slicing the posix_spawn(3) operation into phases emulating (V)FORK+EXEC(+VFORK_DONE) and returning intermediate state to the debugger, that might have abnormal state, introduce new event type: PTRACE_POSIX_SPAWN. A debugger implementor can easily map it into existing fork+exec semantics or treat as a distinct event. There is no functional change for existing debuggers as there was no support for reporting posix_spawn(3) events on the kernel side.
1.232	01-Jun-2019	kamil	Align the KERN_PROC_CWD interface to semantics closer to KERN_PROC_PATHNAME Allow specifying oldlenp as 0 and return size with success for oldp != NULL
1.231	01-Jun-2019	kamil	fill_cwd() Drop GETCWD_CHECK_ACCESS This additional check is not needed and actually prevents from checking the path. This follows the protection rules of /proc/*/cwd.
1.230	31-May-2019	kamil	Use proper copylen for copyout in fill_cwd()
1.229	31-May-2019	kamil	Implement KERN_PROC_CWD in sysctl(3) Retrieve specified process current working directory. Fixes PR kern/50620 by Thomas Klausner.
1.228	01-Mar-2019	pgoyette	Rename the MODULE__HOOK() macros to MODULE_HOOK_() as briefly discussed on irc. NFCI intended. Ride the earlier kernel bump - it;s getting crowded.
1.227	01-Mar-2019	christos	no more p_nsems.
1.226	29-Jan-2019	pgoyette	Normalize all the compat hooks' names to the form <subsystem>_<function>_<version>_hook NFCI XXX Note that although this introduces a change in the kernel-to- XXX module interface, we are NOT bumping the kernel version number. XXX We will bump the version number once the interface stabilizes.
1.225	27-Jan-2019	pgoyette	Merge the [pgoyette-compat] branch
1.224	10-Dec-2018	maxv	Remove unused mbuf.h includes.
1.223	06-Dec-2018	christos	Typo fix (Geoff Wing)
1.222	05-Dec-2018	christos	As discussed in tech-kern: - make sysctl kern.expose_address tri-state: 0: no access 1: access to processes with open /dev/kmem 2: access to everyone defaults: 0: KASLR kernels 1: non-KASLR kernels - improve efficiency by calling get_expose_address() per sysctl, not per process. - don't expose addresses for linux procfs - welcome to 8.99.27, changes to fill_*proc ABI
1.221	24-Nov-2018	christos	- instead of zeroing struct proc on each allocation, provide a pool cache constructor. - instead of sprinkling memsets, zalloc the whole buffer.
1.220	24-Nov-2018	maxv	Fix kernel info leak, we do a blunt copy of struct proc, but it has padding. So zero out the structure on each allocation. And copy field by field while here, because many fields should be hidden by COND_SET_VALUE.
1.219	12-Nov-2018	maxv	Fix buffer overflow, which can lead to severe information leak. Detected by kASan.
1.218	05-Oct-2018	christos	Provide a sysctl kern.expose_address to expose kernel addresses in sysctl structure returns for non-root. Defaults to off. Turning it on will restore sockstat/fstat and friends for regular users.
1.217	04-Sep-2018	maxv	Clear the kernel pointers from kern.proc and kern.proc2 when the user is not privileged.
1.216	04-Sep-2018	maxv	Use p->p_session instead of ep->e_sess, no real functional change.
1.215	04-Sep-2018	maxv	Introduce KAUTH_REQ_PROCESS_CANSEE_KPTR, and use it in the already-existing modstat code. No real functional change.
1.214	03-Sep-2018	riastradh	Rename min/max -> uimin/uimax for better honesty. These functions are defined on unsigned int. The generic name min/max should not silently truncate to 32 bits on 64-bit systems. This is purely a name change -- no functional change intended. HOWEVER! Some subsystems have #define min(a, b) ((a) < (b) ? (a) : (b)) #define max(a, b) ((a) > (b) ? (a) : (b)) even though our standard name for that is MIN/MAX. Although these may invite multiple evaluation bugs, these do _not_ cause integer truncation. To avoid `fixing' these cases, I first changed the name in libkern, and then compile-tested every file where min/max occurred in order to confirm that it failed -- and thus confirm that nothing shadowed min/max -- before changing it. I have left a handful of bootloaders that are too annoying to compile-test, and some dead code: cobalt ews4800mips hp300 hppa ia64 luna68k vax acorn32/if_ie.c (not included in any kernels) macppc/if_gm.c (superseded by gem(4)) It should be easy to fix the fallout once identified -- this way of doing things fails safe, and the goal here, after all, is to _avoid_ silent integer truncations, not introduce them. Maybe one day we can reintroduce min/max as type-generic things that never silently truncate. But we should avoid doing that for a while, so that existing code has a chance to be detected by the compiler for conversion to uimin/uimax without changing the semantics until we can properly audit it all. (Who knows, maybe in some cases integer truncation is actually intended!)
1.213	25-Aug-2018	maxv	Add KAUTH_REQ_PROCESS_CANSEE_EPROC, and use it for the kern.proc node. Same permission as before, so no functional change.
1.212	14-Apr-2018	kamil	branches: 1.212.2; Don't set errno ESRCH for empty result of KINFO_PROC[2] Restore the previous behavior as it's prefered. This new behavior was introduced in 1.210. Code should check for length of the result. Requested by <mlelstv>
1.211	13-Mar-2018	kamil	Make sysctl_doeproc() more predictable Swap the order of looking into zombie and all process lists, start now with the zombie one. This prevents a race observed previously that the same process could be detected on both lists during a single polling call. While there: - Short-circuit break for KERN_PROC_PID, once a pid has been detected. - Removal of redundant "if (kbuf)" and "if (marker)" checks. - Update of comments regarding potential optimization, explaining why we don't want to it as of now. Performance gain from lookup call vs iteration over a list is neglible on a regular system. - Return ESRCH when no results have been found. This allows more easily to implement a retry or abandon algorithm. This corrects races observed in the existing ATF ptrace(2) tests, related to await_zombie(). This function was expecting to check whether a process has been transformed into a zombie, however it was causing occasional crashes as it was overflowing the return buffer, returning the same pid twice: once from allproc list and the second time from zombieproc one. Fix suggested by <christos> Short-circuit break suggested by <kre> Discussed on tech-kern. Sponsored by <The NetBSD Foundation>
1.210	11-Mar-2018	kre	Make a comment meaningful. ie: s/Ditto/what it was copying/ (more or less) That is, there was a comment "Ditto" - which once upon a time, was used to indicate the the previous comment applied here as well. Time passed, and software mutated, and the previous comment was unfortunately sacrificed. Poor little Ditto was left all alone. Noticed while doing some software archaeology.
1.209	30-Nov-2017	maxv	branches: 1.209.2; If no auxv is present, don't kmem_alloc(0). Easy to panic the kernel by typing 'cat /proc/aout_pid/auxv' on whatever a.out binary you're running. Fortunately, amd64 does not enable EXEC_AOUT by default. Unfortunately, i386 does enable it by default.
1.208	07-Nov-2017	christos	Store full executable path in p->p_path as discussed in tech-kern. This means that the full executable path is always available. - exec_elf.c: use p->path to set AT_SUN_EXECNAME, and since this is always set, do so unconditionally. - kern_exec.c: simplify pathexec, use kmem_strfree where appropriate and set p->p_path - kern_exit.c: free p->p_path - kern_fork.c: set p->p_path for the child. - kern_proc.c: use p->p_path to return the executable pathname; the NULL check for p->p_path, should be a KASSERT? - exec.h: gc ep_path, it is not used anymore - param.h: bump version, 'struct proc' size change TODO: 1. reference count the path string, to save copy at fork and free just before exec? 2. canonicalize the pathname by changing namei() to LOCKPARENT vnode and then using getcwd() on the parent directory?
1.207	28-Aug-2017	kamil	Remove the filesystem tracing feature This is a legacy interface from 4.4BSD, and it was introduced to overcome shortcomings of ptrace(2) at that time, which are no longer relevant (performance). Today /proc/#/ctl offers a narrow subset of ptrace(2) commands and is not applicable for modern applications use beyond simplistic tracing scenarios. This removal will simplify kernel internals. Users will still be able to use all the other /proc files. This change won't affect other procfs files neither Linux compat features within mount_procfs(8). /proc/#/ctl isn't available on Linux. Remove: - /proc/#/ctl from mount_procfs(8) - P_FSTRACE note from the documentation of ps(1) - /proc/#/ctl and filesystem tracing documentation from mount_procfs(8) - KAUTH_REQ_PROCESS_PROCFS_CTL documentation from kauth(9) - source code file miscfs/procfs/procfs_ctl.c - PFSctl and procfs_doctl() from sys/miscfs/procfs/procfs.h - KAUTH_REQ_PROCESS_PROCFS_CTL from sys/sys/kauth.h - PSL_FSTRACE (0x00010000) from sys/sys/proc.h - P_FSTRACE (0x00010000) from sys/sys/sysctl.h Reduce code complexity after removal of this functionality. Update TODO.ptrace accordingly: remove two entries about /proc tracing. Do not keep legacy notes as comments in the headers about removed PSL_FSTRACE / P_FSTRACE, as this interface had little number of users (close or equal to zero). Proposed on tech-kern@. All filesystem tracing utility users are encouraged to switch to ptrace(2). Sponsored by <The NetBSD Foundation>
1.206	30-Mar-2017	christos	branches: 1.206.6; factor out getauxv code.
1.205	28-Jan-2017	christos	We need to define COMPAT_NETBSD32 before we include other files; otherwise things like ucontext32_t will be missing.
1.204	27-Jan-2017	christos	rump does not have ucontext32_t
1.203	26-Jan-2017	christos	use __HAVE_COMPAT_NETBSD32
1.202	26-Jan-2017	martin	Restrict the forcing of COMPAT_NETBSD32 to _LP64 kernels - this is probably not the right thing to do, but unbreaks the build for now.
1.201	26-Jan-2017	martin	No COMPAT_NETBSD32 for rump
1.200	26-Jan-2017	christos	always compile in the COMPAT32 code; it is tiny and if we don't it breaks the modules.
1.199	14-Nov-2016	kre	branches: 1.199.2; Return the "true" parent's pid as the parent pid (ppid) via the various sysctl/procfs interfaces that allow it to be interrogated. (This is rather than the temporary parent's pid when a process is being traced and has been reparented.) XXX The ppid in elf32 core files has not been similarly adjusted, XXX Should it be ?
1.198	29-Sep-2016	christos	Introduce and use PROC_PTRSZ() to handle differing pointer size 64->32 emulation.
1.197	17-Sep-2016	maxv	Use VM_MAXUSER_ADDRESS for proc0, not VM_MAX_ADDRESS. It normally does not change anything, since kernel processes use the shared kernel map instead of the one they are given here. For consistency though, it is better to make sure UVM will not be tempted to access machine-dependent reserved areas (e.g., the PTE space on x86).
1.196	25-May-2016	christos	branches: 1.196.2; Introduce security.pax.mprotect.ptrace sysctl which can be used to bypass mprotect settings so that debuggers can write to the text segment of traced processes so that they can insert breakpoints. Turned off by default. Ok: chuq (for now)
1.195	04-Apr-2016	christos	Split p_xstat (composite wait(2) status code, or signal number depending on context) into: 1. p_xexit: exit code 2. p_xsig: signal number 3. p_sflag & WCOREFLAG bit to indicated that the process core-dumped. Fix the documentation of the flag bits in <sys/proc.h>
1.194	24-Sep-2015	christos	implementation of KERN_PROC_PATHNAME, some refactoring for KERN_PROC.
1.193	12-Jul-2014	njoly	branches: 1.193.4; Allow fill_kproc2() to be used by more than sysctl.
1.192	25-Feb-2014	pooka	branches: 1.192.2; Ensure that the top level sysctl nodes (kern, vfs, net, ...) exist before the sysctl link sets are processed, and remove redundancy. Shaves >13kB off of an amd64 GENERIC, not to mention >1k duplicate lines of code.
1.191	25-Jan-2014	christos	__USING_TOPDOWN_VM is no more, __USE_TOPDOWN_VM...
1.190	14-Nov-2013	martin	As discussed on tech-kern: make TOPDOWN-VM runtime selectable per process (offer MD code or emulations to override it).
1.189	25-Oct-2013	martin	Mark a diagnostic-only variable
1.188	10-Sep-2013	matt	Support an optional MARCH ELF tag. Store the MACHINE_ARCH of the executable in mdproc and override sysctl so that value returned.
1.187	10-Jun-2013	pooka	branches: 1.187.2; g/c unused static variable
1.186	09-Jun-2012	christos	branches: 1.186.2; Add a new resource to limit the number of lwps per user, RLIMIT_NTHR. There is a global sysctl kern.maxlwp to control this, which is by default 2048. The first lwp of each process or kernel threads are not counted against the limit. To show the current resource usage per user, I added a new sysctl that dumps the uidinfo structure fields.
1.185	06-Jun-2012	martin	Henning Petersen in PR kern/46552: include cosmetics
1.184	05-Jun-2012	martin	Measure kinfo_proc2::p_vm_vsize in pages, as it was always documented. This value seems to never have been used anywhere. This makes it consistent with it's cousin p_vm_msize (which is in pages as well and has several uses).
1.183	13-Apr-2012	yamt	comment
1.182	19-Feb-2012	rmind	Remove COMPAT_SA / KERN_SA. Welcome to 6.99.3! Approved by core@.
1.181	11-Feb-2012	martin	branches: 1.181.2; Add a posix_spawn syscall, as discussed on tech-kern. Based on the summer of code project by Charles Zhang, heavily reworked later by me - all bugs are likely mine. Ok: core, releng.
1.180	13-May-2011	rmind	branches: 1.180.4; 1.180.8; Sprinkle __cacheline_aligned and __read_mostly, also const-ify.
1.179	01-May-2011	rmind	- Remove FORK_SHARELIMIT and PL_SHAREMOD, simplify lim_privatise(). - Use kmem(9) for struct plimit::pl_corename.
1.178	01-May-2011	rmind	Merge duplicate code fragments into a new lim_setcorename() routine.
1.177	01-May-2011	rmind	Rename limfree() to lim_free(), misc clean up. No functional change.
1.176	27-Apr-2011	rmind	G/C M_EMULDATA
1.175	18-Apr-2011	rmind	Replace malloc with kmem, and remove M_SUBPROC.
1.174	05-Apr-2011	rmind	sysctl_kern_proc_args: fix the deadlock (hi joerg!).
1.173	05-Mar-2011	matt	Simplify copyin_psstrings a bit.
1.172	04-Mar-2011	joerg	Refactor ps_strings access. Based on PK_32, write either the normal version or the 32bit compat layout in execve1. Introduce a new function copyin_psstrings for reading it back from userland and converting it to the native layout. Refactor procfs to share most of the code with the kern.proc_args sysctl handler. This material is based upon work partially supported by The NetBSD Foundation under a contract with Joerg Sonnenberger.
1.171	28-Jan-2011	pooka	migrate compat32 handling with previous pointed out by Lars Heidieker
1.170	28-Jan-2011	pooka	Move sysctl routines from init_sysctl.c to kern_descrip.c (for descriptors) and kern_proc.c (for processes). This makes them usable in a rump kernel, in case somebody was wondering.
1.169	17-Jan-2011	uebayasi	branches: 1.169.2; Include internal definitions (uvm/uvm.h) only where necessary.
1.168	07-Jul-2010	chs	branches: 1.168.2; many changes for COMPAT_LINUX: - update the linux syscall table for each platform. - support new-style (NPTL) linux pthreads on all platforms. clone() with CLONE_THREAD uses 1 process with many LWPs instead of separate processes. - move the contents of sys__lwp_setprivate() into a new lwp_setprivate() and use that everywhere. - update linux_release[] and linux32_release[] to "2.6.18". - adjust placement of emul fork/exec/exit hooks as needed and adjust other emul code to match. - convert all struct emul definitions to use named initializers. - change the pid allocator to allow multiple pids to refer to the same proc. - remove a few fields from struct proc that are no longer needed. - disable the non-functional "vdso" code in linux32/amd64, glibc works fine without it. - fix a race in the futex code where we could miss a wakeup after a requeue operation. - redo futex locking to be a little more efficient.
1.167	01-Jul-2010	rmind	Remove pfind() and pgfind(), fix locking in various broken uses of these. Rename real routines to proc_find() and pgrp_find(), remove PFIND_* flags and have consistent behaviour. Provide proc_find_raw() for special cases. Fix memory leak in sysctl_proc_corename(). COMPAT_LINUX: rework ptrace() locking, minimise differences between different versions per-arch. Note: while this change adds some formal cosmetics for COMPAT_DARWIN and COMPAT_IRIX - locking there is utterly broken (for ages). Fixes PR/43176.
1.166	10-Jun-2010	pooka	lwp0 seems like an lwp instead of a process, so move bits related to it from kern_proc.c to kern_lwp.c. This makes kern_proc "scheduling-clean" and more easily usable in environments with a non-integrated scheduler (like, to take a random example, rump).
1.165	10-Jun-2010	pooka	smoke the smoke, hack the hack, beep the beep, _KERNEL_OPT the _KERNEL_POT
1.164	04-Jun-2010	rmind	proc_alloc: move kdtrace_proc_ctor() out of the proc_lock.
1.163	26-Feb-2010	jym	branches: 1.163.2; Change RSS (resident set size) limit. Instead of setting it arbitrarily to the total free memory available to the system, use the smallest value between VM_MAXUSER_ADDRESS and total free memory (having a RSS limit bigger than VM_MAXUSER_ADDRESS has no real meaning). Fix a possible int overflow when ptoa(uvmexp.free) is bigger than 4GB with a 32 bits vaddr_t. This change is similar to the one made in rev 1.144 of uvm/uvm_glue.c.
1.162	23-Feb-2010	darran	DTrace: Get rid of the KDTRACE_HOOKS ifdefs in the kernel. Replace the functions with inline function that are empty when KDTRACE_HOOKS is not defined.
1.161	21-Feb-2010	darran	Added a defflag option for KDTRACE_HOOKS and included opt_dtrace.h in the relevant files. (Per Quentin Garnier - thanks!).
1.160	21-Feb-2010	darran	Add the DTrace hooks to the kernel (KDTRACE_HOOKS config option). DTrace adds a pointer to the lwp and proc structures which it uses to manage its state. These are opaque from the kernel perspective to keep the kernel free of CDDL code. The state arenas are kmem_alloced and freed as proccesses and threads are created and destoyed. Also add a check for trap06 (privileged/illegal instruction) so that DTrace can check for D scripts that may have triggered the trap so it can clean up after them and resume normal operation. Ok with core@.
1.159	17-Dec-2009	rmind	branches: 1.159.2; Replace few USER_TO_UAREA/UAREA_TO_USER uses, reduce sys/user.h inclusions.
1.158	26-Nov-2009	matt	Kill proc0paddr. Use lwp0.l_addr instead.
1.157	04-Nov-2009	pooka	nuke unused local variable
1.156	01-Nov-2009	rmind	orphanpg: remove no longer user variable.
1.155	21-Oct-2009	rmind	Remove uarea swap-out functionality: - Addresses the issue described in PR/38828. - Some simplification in threading and sleepq subsystems. - Eliminates pmap_collect() and, as a side note, allows pmap optimisations. - Eliminates XS_CTL_DATA_ONSTACK in scsipi code. - Avoids few scans on LWP list and thus potentially long holds of proc_lock. - Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k. - Removes __SWAP_BROKEN cases. Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on acorn26 (thanks to <bjh21>). Discussed on <tech-kern>, reviewed by <ad>.
1.154	04-Oct-2009	elad	Install floppies (haha) don't get built with ktrace/ptrace, so they don't include kern/sys_process.c. Move proc_uidmatch() to kern/kern_proc.c which always gets built instead. Pointed out by Kurt Schreiner on current-users@: http://mail-index.netbsd.org/current-users/2009/10/03/msg010745.html
1.153	03-Oct-2009	elad	Move policies for KAUTH_PROCESS_{CANSEE,CORENAME,STOPFLAG,FORK} back to the subsystem. Note: Consider killing the signal listener and sticking KAUTH_PROCESS_SIGNAL here as well.
1.152	23-May-2009	ad	Make descriptor access and file allocation cheaper in many cases, mostly by avoiding a bunch of atomic operations.
1.151	25-Apr-2009	rmind	- Rearrange pg_delete() and pg_remove() (renamed pg_free), thus proc_enterpgrp() with proc_leavepgrp() to free process group and/or session without proc_lock held. - Rename SESSHOLD() and SESSRELE() to to proc_sesshold() and proc_sessrele(). The later releases proc_lock now. Quick OK by <ad>.
1.150	16-Apr-2009	rmind	- Manage pid_table with kmem(9). - Remove M_PROC and unused M_SESSION.
1.149	16-Apr-2009	rmind	Avoid few #ifdef KSTACK_CHECK_MAGIC.
1.148	28-Mar-2009	rmind	Make inferior() function static, rename to p_inferior(), return bool.
1.147	24-Jan-2009	rmind	branches: 1.147.2; Set l_psid to PS_NONE for lwp0 (consistency change).
1.146	17-Dec-2008	cegger	kill MALLOC and FREE macros.
1.145	19-Nov-2008	ad	Make the emulations, exec formats, coredump, NFS, and the NFS server into modules. By and large this commit: - shuffles header files and ifdefs - splits code out where necessary to be modular - adds module glue for each of the components - adds/replaces hooks for things that can be installed at runtime
1.144	15-Oct-2008	wrstuden	branches: 1.144.2; Merge wrstuden-revivesa into HEAD.
1.143	24-Jun-2008	gmcgarry	branches: 1.143.2; The conversion to c99-style designated initialisers brought in the gcc extension of specifying an array range. Revert to runtime initialization of limit0. See here for details: http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html
1.142	19-May-2008	ad	branches: 1.142.2; Reduce ifdefs due to MULTIPROCESSOR slightly.
1.141	03-May-2008	yamt	branches: 1.141.2; enterpgrp: 0 -> NULL for pointers. no functional changes.
1.140	28-Apr-2008	martin	Remove clause 3 and 4 from TNF licenses
1.139	27-Apr-2008	ad	branches: 1.139.2; Adjust previous: orphang() shouldn't have been playing about with tty_lock. It was a bit of code that I accidenally left in.
1.138	27-Apr-2008	christos	orphanpg wants the tty lock held.
1.137	24-Apr-2008	ad	Merge proc::p_mutex and proc::p_smutex into a single adaptive mutex, since we no longer need to guard against access from hardware interrupt handlers. Additionally, if cloning a process with CLONE_SIGHAND, arrange to have the child process share the parent's lock so that signal state may be kept in sync. Partially addresses PR kern/37437.
1.136	24-Apr-2008	ad	Network protocol interrupts can now block on locks, so merge the globals proclist_mutex and proclist_lock into a single adaptive mutex (proc_lock). Implications: - Inspecting process state requires thread context, so signals can no longer be sent from a hardware interrupt handler. Signal activity must be deferred to a soft interrupt or kthread. - As the proc state locking is simplified, it's now safe to take exit() and wait() out from under kernel_lock. - The system spends less time at IPL_SCHED, and there is less lock activity.
1.135	17-Apr-2008	yamt	branches: 1.135.2; pidtbl_dump: use queue.h macros. no functional change.
1.134	17-Apr-2008	yamt	enterpgrp: update a comment.
1.133	22-Mar-2008	ad	LWP_CACHE_CREDS: instead of testing (l_cred != p_cred), use a per-LWP flag bit to indicate a pending cred update. Avoids touching one item of shared state in the syscall path.
1.132	21-Mar-2008	ad	Catch up with descriptor handling changes. See kern_descrip.c revision 1.173 for details.
1.131	17-Mar-2008	ad	Process group and session structures are allocated so infrequently that there is no point having seperate caches for them. Just use kmem_alloc().
1.130	17-Mar-2008	rmind	- Initialize uihashtbl in resource_init(); - Make some variables static, remove the externs from header; - Wrap few long lines, misc; No functional changes are intended.
1.129	02-Jan-2008	ad	branches: 1.129.2; 1.129.6; Merge vmlocking2 to head.
1.128	26-Dec-2007	ad	Merge more changes from vmlocking2, mainly: - Locking improvements. - Use pool_cache for more items.
1.127	05-Dec-2007	ad	branches: 1.127.4; Match the docs: MUTEX_DRIVER/SPIN are now only for porting code written for Solaris.
1.126	04-Dec-2007	ad	Use atomics to maintain nprocs.
1.125	03-Dec-2007	ad	branches: 1.125.2; Soft interrupts can now take proclist_lock, so there is no need to double-lock alllwp or allproc.
1.124	11-Nov-2007	matt	Change some initialization of static queues to compile time. (xxx_INIT to xxx_HEAD_INITIALIZER). Drop code which inits non-auto (global or static) variables to 0 since that's already implied by being non-auto. Init some static/global cpu_simple_locks at compile time.
1.123	07-Nov-2007	matt	Use C99 structures initializers when possible. [from matt-armv6]
1.122	07-Nov-2007	ad	Merge from vmlocking: - pool_cache changes. - Debugger/procfs locking fixes. - Other minor changes.
1.121	06-Nov-2007	ad	Merge scheduler changes from the vmlocking branch. All discussed on tech-kern: - Invert priority space so that zero is the lowest priority. Rearrange number and type of priority levels into bands. Add new bands like 'kernel real time'. - Ignore the priority level passed to tsleep. Compute priority for sleep dynamically. - For SCHED_4BSD, make priority adjustment per-LWP, not per-process.
1.120	24-Oct-2007	ad	branches: 1.120.2; Make ras_lookup() lockless.
1.119	23-Oct-2007	yamt	proc0_init: change lwp0's priority from PRIBIO to PUSER so that init and its children has a user priority. uvm_scheduler adjusts its own priority later.
1.118	12-Oct-2007	ad	branches: 1.118.2; Merge from vmlocking: fix a deadlock with (threaded) soft interrupts and process exit.
1.117	29-Sep-2007	dsl	Change the way p->p_limit (and hence p->p_rlimit) is locked. Should fix PR/36939 and make the rlimit code MP safe. Posted for comment to tech-kern (non received!) The p_limit field (for a process) is only be changed once (on the first write), and a reference to the old structure is kept (for code paths that have cached the pointer). Only p->p_limit is now locked by p->p_mutex, and since the referenced memory will not go away, is only needed if the pointer is to be changed. The contents of 'struct plimit' are all locked by pl_mutex, except that the code doesn't bother to acquire it for reads (which are basically atomic). Add FORK_SHARELIMIT that causes fork1() to share the limits between parent and child, use it for the IRIX_PR_SULIMIT. Fix borked test for both IRIX_PR_SUMASK and IRIX_PR_SDIR being set.
1.116	21-Sep-2007	dsl	branches: 1.116.2; Rename members of 'struct plimit' so that the fields are 'pl_xxx' and no longer have the same names as members of 'struct proc'.
1.115	06-Sep-2007	ad	- Fix sleepq_block() to return EINTR if the LWP is cancelled. Pointed out by yamt@. - Introduce SOBJ_SLEEPQ_LIFO, and use for LWPs sleeping via _lwp_park. libpthread enqueues most waiters in LIFO order to try and wake LWPs that ran recently, since their working set is more likely to be in cache. Matching the order of insertion reduces the time spent searching queues in the kernel. - Do not boost the priority of LWPs sleeping in _lwp_park, just let them sleep at their user priority level. LWPs waiting for some I/O event in the kernel still wait with kernel priority and get woken more quickly. This needs more evaluation and is to be revisited, but the effect on a variety of benchmarks is positive. - When waking LWPs, do not send an IPI to remote CPUs or arrange for the current LWP to be preempted unless (a) the thread being awoken has kernel priority and has higher priority than the currently running thread or (b) the remote CPU is idle.
1.114	10-Aug-2007	dyoung	branches: 1.114.2; Fix kernel compilation with 'options KSTACK_CHECK_MAGIC': change 'void ' to 'char ' so pointer arithmetic will work.
1.113	09-Jul-2007	ad	branches: 1.113.2; 1.113.6; Merge some of the less invasive changes from the vmlocking branch: - kthread, callout, devsw API changes - select()/poll() improvements - miscellaneous MT safety improvements
1.112	15-Jun-2007	ad	splstatclock, spllock -> splhigh
1.111	14-Jun-2007	yamt	proc_drainrefs: fix the case of exec failure.
1.110	17-May-2007	yamt	merge yamt-idlelwp branch. asked by core@. some ports still needs work. from doc/BRANCHES: idle lwp, and some changes depending on it. 1. separate context switching and thread scheduling. (cf. gmcgarry_ctxsw) 2. implement idle lwp. 3. clean up related MD/MI interfaces. 4. make scheduler(s) modular.
1.109	30-Apr-2007	dsl	Remove proc->p_ru and the 'rusage' pool. I think it existed to cache the numbers in kernel memory of a zombie when proc->p_stats was part of the 'u' area - so got freed earlier and wouldn't (easily) be accessible from a separate process. However since both the p_ru and p_stats fields are freed at the same time it is no longer needed. Ride the recent 4.99.19 version change.
1.108	12-Mar-2007	ad	branches: 1.108.2; Pass an ipl argument to pool_init/POOL_INIT to be used when initializing the pool's lock.
1.107	09-Mar-2007	ad	branches: 1.107.2; - Make the proclist_lock a mutex. The write:read ratio is unfavourable, and mutexes are cheaper use than RW locks. - LOCK_ASSERT -> KASSERT in some places. - Hold proclist_lock/kernel_lock longer in a couple of places.
1.106	04-Mar-2007	christos	Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.
1.105	26-Feb-2007	yamt	implement priority inheritance.
1.104	21-Feb-2007	thorpej	Pick up some additional files that were missed before due to conflicts with newlock2 merge: Replace the Mach-derived boolean_t type with the C99 bool type. A future commit will replace use of TRUE and FALSE with true and false.
1.103	18-Feb-2007	dsl	Add code to support per-system call statistics: option SYSCALL_STATS counts the number of times each system call is made option SYSCALL_TIMES counts the amount of time spent in each system call Currently the counting hooks have only been added to the i386 system call handler, and the time spent in interrupts is not subtracted. It ought also be possible to add the times to the processes profiling counters in order to get a more accurate user/system/interrupt split. The counts themselves are readable via the sysctl interface.
1.102	17-Feb-2007	pavel	Change the process/lwp flags seen by userland via sysctl back to the P_/L_ naming convention, and rename the in-kernel flags to avoid conflict. (P_ -> PK_, L_ -> LW_ ). Add back the (now unused) LSDEAD constant. Restores source compatibility with pre-newlock2 tools like ps or top. Reviewed by Andrew Doran.
1.101	17-Feb-2007	dsl	Acquire proclist_lock in pgid_in_session() so we don't reference potentially stale proc & pgrp pointers.
1.100	09-Feb-2007	ad	branches: 1.100.2; Merge newlock2 to head.
1.99	21-Oct-2006	pooka	branches: 1.99.2; pool_get(): use PR_WAITOK, not M_WAITOK (which happens to be PR_NOWAIT ..) XXX: not the first time this mistake has been made
1.98	11-Oct-2006	thorpej	Don't free specificdata in lwp_exit2(); it's not safe to block there. Instead, free an LWP's specificdata from lwp_exit() (if it is not the last LWP) or exit1() (if it is the last LWP). For consistency, free the proc's specificdata from exit1() as well. Add lwp_finispecific() and proc_finispecific() functions to make this more convenient.
1.97	09-Oct-2006	martin	Remove unused variables.
1.96	08-Oct-2006	christos	add {proc,lwp}_initspecific and use them to init proc0 and lwp0.
1.95	08-Oct-2006	thorpej	Add specificdata support to procs and lwps, each providing their own wrappers around the speicificdata subroutines. Also: - Call the new lwpinit() function from main() after calling procinit(). - Move some pool initialization out of kern_proc.c and into files that are directly related to the pools in question (kern_lwp.c and kern_ras.c). - Convert uipc_sem.c to proc_{get,set}specific(), and eliminate the p_ksems member from struct proc.
1.94	30-Jul-2006	ad	branches: 1.94.4; 1.94.6; Single-thread updates to the process credential.
1.93	27-Jul-2006	christos	PR/34094: Jorge Acereda: Kernel option KSTACK_CHECK_MAGIC doesn't build
1.92	19-Jul-2006	ad	- Hold a reference to the process credentials in each struct lwp. - Update the reference on syscall and user trap if p_cred has changed. - Collect accounting flags in the LWP, and collate on LWP exit.
1.91	25-Jun-2006	yamt	move SA related pools to where they are used. make them static.
1.90	11-Jun-2006	rjs	branches: 1.90.2; Add includes of opt_multiprocessor.h and opt_lockdebug.h where missing.
1.89	14-May-2006	elad	branches: 1.89.2; integrate kauth.
1.88	10-Apr-2006	onoe	Move "opt_maxuprc.h" from init_main.c to kern_proc.c, as the definition of maxuprc has been moved to kern_proc.c (rev. 1.80).
1.87	12-Mar-2006	yamt	branches: 1.87.2; proc_vmspace_getref: treat curproc specially to fix coredump problem pointed by Christos Zoulas.
1.86	01-Mar-2006	yamt	branches: 1.86.2; 1.86.4; merge yamt-uio_vmspace branch. - use vmspace rather than proc or lwp where appropriate. the latter is more natural to specify an address space. (and less likely to be abused for random purposes.) - fix a swdmover race.
1.85	26-Dec-2005	perry	branches: 1.85.2; 1.85.4; 1.85.6; u_intN_t -> uintN_t
1.84	24-Dec-2005	perry	Remove leading __ from __(const\|inline\|signed\|volatile) -- it is obsolete.
1.83	26-Nov-2005	simonb	Convert malloc/free of struct ptimers to pools. Move the ptimer pool to kern_time.c to keep like pools together, and it wasn't used in kern_proc.c
1.82	05-Aug-2005	junyoung	branches: 1.82.6; Cosmetic changes.
1.81	05-Aug-2005	junyoung	Move proc0 initialization from main() in init_main.c and proc0_insert() in kern_proc.c into a new function proc0_init() in kern_proc.c, as suggested on tech-kern@ days ago.
1.80	03-Oct-2004	yamt	branches: 1.80.12; proclist_foreach_call: tweak an assertion to deal with the case that spinlockmgr is no-op. PR/27125 from Andreas Wrede.
1.79	01-Oct-2004	yamt	introduce a function, proclist_foreach_call, to iterate all procs on a proclist and call the specified function for each of them. primarily to fix a procfs locking problem, but i think that it's useful for others as well. while i'm here, introduce PROCLIST_FOREACH macro, which is similar to LIST_FOREACH but skips marker entries which are used by proclist_foreach_call.
1.78	06-May-2004	pk	Provide a mutex for the process limits data structure.
1.77	25-Apr-2004	simonb	Initialise (most) pools from a link set instead of explicit calls to pool_init. Untouched pools are ones that either in arch-specific code, or aren't initialiased during initial system startup. Convert struct session, ucred and lockf to pools.
1.76	17-Apr-2004	christos	PR/9347: Eric E. Fair: socket buffer pool exhaustion leads to system deadlock and unkillable processes. 1. Introduce new SBSIZE resource limit from FreeBSD to limit socket buffer size resource. 2. make sokvareserve interruptible, so processes ltsleeping on it can be killed.
1.75	14-Mar-2004	cl	add kernel part of concurrency support for SA on MP systems - move per VP data into struct sadata_vp referenced from l->l_savp * VP id * lock on VP data * LWP on VP * recently blocked LWP on VP * queue of LWPs woken which ran on this VP before sleep * faultaddr * LWP cache for upcalls * upcall queue - add current concurrency and requested concurrency variables - make process exit run LWP on all VPs - make signal delivery consider all VPs - make timer events consider all VPs - add sa_newsavp to allocate new sadata_vp structure - add sa_increaseconcurrency to prepare new VP - make sys_sa_setconcurrency request new VP or wakeup idle VP - make sa_yield lower current concurrency - set sa_cpu = VP id in upcalls - maintain cached LWPs per VP
1.74	27-Feb-2004	junyoung	More typos in comments.
1.73	26-Feb-2004	junyoung	pgrpdump() is gone.
1.72	26-Feb-2004	junyoung	- Fix typos. - De-__P(). - Remove trailing spaces.
1.71	06-Feb-2004	pk	pg_delete: re-arrange SESSRELE() calls to allow for better code generation.
1.70	04-Jan-2004	jdolecek	Rearrange process exit path to avoid need to free resources from different process context ('reaper'). From within the exiting process context: * deactivate pmap and free vmspace while we can still block * introduce MD cpu_lwp_free() - this cleans all MD-specific context (such as FPU state), and is the last potentially blocking operation; all of cpu_wait(), and most of cpu_exit(), is now folded into cpu_lwp_free() * process is now immediatelly marked as zombie and made available for pickup by parent; the remaining last lwp continues the exit as fully detached * MI (rather than MD) code bumps uvmexp.swtch, cpu_exit() is now same for both 'process' and 'lwp' exit uvm_lwp_exit() is modified to never block; the u-area memory is now always just linked to the list of available u-areas. Introduce (blocking) uvm_uarea_drain(), which is called to release the excessive u-area memory; this is called by parent within wait4(), or by pagedaemon on memory shortage. uvm_uarea_free() is now private function within uvm_glue.c. MD process/lwp exit code now always calls lwp_exit2() immediatelly after switching away from the exiting lwp. g/c now unneeded routines and variables, including the reaper kernel thread
1.69	17-Nov-2003	cl	- use list to keep track of free stacks. - use splay tree for the pagefault check if the thread was running on an upcall stack. => removes the limitation that all upcall stacks need to be adjoining and that all upcall stacks have to be loaded with the 1st sys_sa_stacks call. => enables keeping information associated with a stack in the kernel which makes it simpler to find out which LWP is using a stack. => allows increasing the SA_MAXNUMSTACKS without having to allocate an array of that size.
1.68	12-Nov-2003	dsl	- Count number of zombies and stopped children and requeue them at the top of the sibling list so that find_stopped_child can be optimised to avoid traversing the entire sibling list - helps when a process has a lot of children. - Modify locking in pfind() and pgfind() to that the caller can rely on the result being valid, allow caller to request that zombies be findable. - Rename pfind() to p_find() to ensure we break binary compatibility. - Remove svr4_pfind since p_find willnow do the job. - Modify some of the SMP locking of the proc lists - signals are still stuffed. Welcome to 1.6ZF
1.67	04-Nov-2003	dsl	Remove p_nras from struct proc - use LIST_EMPTY(&p->p_raslist) instead. Remove p_raslock and rename p_lwplock p_lock (one lock is enough). Simplify window test when adding a ras and correct test on VM_MAXUSER_ADDRESS. Avoid unpredictable branch in i386 locore.S (pad fields left in struct proc to avoid kernel bump)
1.66	16-Sep-2003	christos	add initialization of siginfo lock and queue. Also initialize the lock for lwps, although it is not used for proc0 for code consistency.
1.65	07-Aug-2003	agc	Move UCB-licensed code from 4-clause to 3-clause licence. Patches provided by Joel Baker in PR 22364, verified by myself.
1.64	19-Mar-2003	dsl	branches: 1.64.2; Indentation fixes
1.63	19-Mar-2003	christos	- use __predict_false for DIAGNOSTIC code. - #ifdef out a DIAGNOSTIC printf() that was too annoying (rule of thumb, don't make DIAGNOSTIC printfs() that print very frequently...) - fix DIAGNOSTIC test that would always get triggered on a new session.
1.62	19-Mar-2003	christos	make this compile again (-DDIAGNOSTIC)
1.61	19-Mar-2003	dsl	Alternative pid/proc allocater, removes all searches associated with pid lookup and allocation, and any dependency on NPROC or MAXUSERS. NO_PID changed to -1 (and renamed NO_PGID) to remove artificial limit on PID_MAX. As discussed on tech-kern.
1.60	12-Mar-2003	dsl	Add pgid_in_session() for validating TIOCSPGRP requests (approved by christos)
1.59	12-Mar-2003	dsl	KNF function prototypes
1.58	15-Feb-2003	dsl	Fix support of 15 and 16 character lognames. Warn if the logname is changed within a session - usually a missing setsid. (approved by christos)
1.57	01-Feb-2003	thorpej	Add extensible malloc types, adapted from FreeBSD. This turns malloc types into a structure, a pointer to which is passed around, instead of an int constant. Allow the limit to be adjusted when the malloc type is defined, or with a function call, as suggested by Jonathan Stone.
1.56	22-Jan-2003	yamt	make KSTACK_CHECK_* compile after sa merge.
1.55	18-Jan-2003	thorpej	Merge the nathanw_sa branch.
1.54	27-Sep-2002	provos	branches: 1.54.2; remove trailing \n in panic(). approved perry.
1.53	25-Sep-2002	thorpej	Don't include <sys/map.h>.
1.52	04-Sep-2002	matt	Use the queue macros from <sys/queue.h> instead of referring to the queue members directly. Use *_FOREACH whenever possible.
1.51	28-Aug-2002	gmcgarry	MI kernel support for user-level Restartable Atomic Sequences (RAS).
1.50	26-Jul-2002	enami	Cosmetic changes.
1.49	26-Jul-2002	enami	Add some necessary but missing resource deallocation.
1.48	02-Jul-2002	yamt	add KSTACK_CHECK_MAGIC. discussed on tech-kern.
1.47	12-Apr-2002	christos	branches: 1.47.2; Use SESSHOLD and SESSRELE consistently. Add SESSHOLD and SESSRELE to the t_session, so that we don't have dangling references [inspired by OpenBSD].
1.46	08-Mar-2002	thorpej	branches: 1.46.2; Pool deals fairly well with physical memory shortage, but it doesn't deal with shortages of the VM maps where the backing pages are mapped (usually kmem_map). Try to deal with this: * Group all information about the backend allocator for a pool in a separate structure. The pool references this structure, rather than the individual fields. * Change the pool_init() API accordingly, and adjust all callers. * Link all pools using the same backend allocator on a list. * The backend allocator is responsible for waiting for physical memory to become available, but will still fail if it cannot callocate KVA space for the pages. If this happens, carefully drain all pools using the same backend allocator, so that some KVA space can be freed. * Change pool_reclaim() to indicate if it actually succeeded in freeing some pages, and use that information to make draining easier and more efficient. * Get rid of PR_URGENT. There was only one use of it, and it could be dealt with by the caller. From art@openbsd.org.
1.45	12-Nov-2001	lukem	add RCSIDs
1.44	04-Feb-2001	pk	branches: 1.44.2; 1.44.4; 1.44.8; When freeing a session, remove the reference to it from the associated tty.
1.43	08-Nov-2000	ad	Update for hashinit() change.
1.42	17-Aug-2000	thorpej	If maniuplating a read lock on the proc list, we no longer need to go to splclock() -- spinlockmgr() handles the interrupt blocking while holding the interlock for us, now.
1.41	27-May-2000	sommerfeld	branches: 1.41.4; Reduce use of curproc in several places: - Change ktrace interface to pass in the current process, rather than p->p_tracep, since the various ktr* function need curproc anyway. - Add curproc as a parameter to mi_switch() since all callers had it handy anyway. - Add a second proc argument for inferior() since callers all had curproc handy. Also, miscellaneous cleanups in ktrace: - ktrace now always uses file-based, rather than vnode-based I/O (simplifies, increases type safety); eliminate KTRFLAG_FD & KTRFAC_FD. Do non-blocking I/O, and yield a finite number of times when receiving EWOULDBLOCK before giving up. - move code duplicated between sys_fktrace and sys_ktrace into ktrace_common. - simplify interface to ktrwrite()
1.40	08-May-2000	thorpej	__predict_false() the DIAGNOSTIC error checks.
1.39	30-Mar-2000	augustss	Get rid of register declarations.
1.38	22-Jan-2000	thorpej	After some discussion with Mycroft, change splstatclock() to splclock(). The rule is that you don't get to call scheduler-related functions (e.g. wakeup()) above the clock interrupt. Going to statclock unnecessarily hoses e.g. serial interrupts on the SPARC.
1.37	22-Jan-2000	thorpej	Back out rev 1.36... what was I thinking? Also, update the comment that led me astray to reflect reality.
1.36	13-Jan-2000	thorpej	Per my comment earlier in the file, we only need to go do splsoftclock() when write-locking the proclist; splstatclock() is a wee bit overkill.
1.35	28-Sep-1999	bouyer	branches: 1.35.2; Remplace kern.shortcorename sysctl with a more flexible sheme, core filename format, which allow to change the name of the core dump, and to relocate it in a directory. Credits to Bill Sommerfeld for giving me the idea :) The default core filename format can be changed by options DEFCORENAME and/or kern.defcorename Create a new sysctl tree, proc, which holds per-process values (for now the corename format, and resources limits). Process is designed by its pid at the second level name. These values are inherited on fork, and the corename fomat is reset to defcorename on suid/sgid exec. Create a p_sugid() function, to take appropriate actions on suid/sgid exec (for now set the P_SUGID flag and reset the per-proc corename). Adjust dosetrlimit() to allow changing limits of one proc by another, with credential controls.
1.34	25-Jul-1999	thorpej	Turn the proclist lock into a read/write spinlock. Update proclist locking calls to reflect this. Also, block statclock rather than softclock during in the proclist locking functions, to address a problem reported on current-users by Sean Doran.
1.33	22-Jul-1999	thorpej	Add a read/write lock to the proclists and PID hash table. Use the write lock when doing PID allocation, and during the process exit path. Use a read lock every where else, including within schedcpu() (interrupt context). Note that holding the write lock implies blocking schedcpu() from running (blocks softclock). PID allocation is now MP-safe. Note this actually fixes a bug on single processor systems that was probably extremely difficult to tickle; it was possible that schedcpu() would run off a bad pointer if the right clock interrupt happened to come in the middle of a LIST_INSERT_HEAD() or LIST_REMOVE() to/from allproc.
1.32	22-Jul-1999	thorpej	Rework the process exit path, in preparation for making process exit and PID allocation MP-safe. A new process state is added: SDEAD. This state indicates that a process is dead, but not yet a zombie (has not yet been processed by the process reaper). SDEAD processes exist on both the zombproc list (via p_list) and deadproc (via p_hash; the proc has been removed from the pidhash earlier in the exit path). When the reaper deals with a process, it changes the state to SZOMB, so that wait4 can process it. Add a P_ZOMBIE() macro, which treats a proc in SZOMB or SDEAD as a zombie, and update various parts of the kernel to reflect the new state.
1.31	08-Sep-1998	thorpej	branches: 1.31.8; - Add a new proclist, deadproc, which holds dead-but-not-yet-zombie processes. - Create a new data structure, the proclist_desc, which contains a pointer to a proclist, and eventually, a pointer to the lock for that proclist. Declare a static array of proclist_descs, proclists[], consisting of allproc, deadproc, and zombproc.
1.30	01-Sep-1998	thorpej	Use the pool allocator and the "nointr" pool page allocator for rusage structures.
1.29	01-Sep-1998	thorpej	Use the pool allocator and the "nointr" pool page allocator for pgrp structures.
1.28	31-Aug-1998	thorpej	Use the pool allocator and "nointr" pool page allocator for pcred and plimit structures.
1.27	28-Aug-1998	thorpej	Use the "nointr" pool page allocator.
1.26	18-Aug-1998	thorpej	Add some braces to make egcs happy (ambiguous else warning).
1.25	04-Aug-1998	perry	Abolition of bcopy, ovbcopy, bcmp, and bzero, phase one. bcopy(x, y, z) -> memcpy(y, x, z) ovbcopy(x, y, z) -> memmove(y, x, z) bcmp(x, y, z) -> memcmp(x, y, z) bzero(x, y) -> memset(x, 0, y)
1.24	02-Aug-1998	thorpej	Use a pool for proc structures.
1.23	01-Mar-1998	fvdl	Merge with Lite2 + local changes
1.22	14-Feb-1998	kleink	Fix variable declarations: register -> register int.
1.21	14-Feb-1998	thorpej	Prevent the session ID from disappearing if the session leader exits (thus causing s_leader to become NULL) by storing the session ID separately in the session structure. Export the session ID to userspace in the eproc structure. Submitted by Tom Proett <proett@nas.nasa.gov>.
1.20	07-Feb-1998	chs	add flags arg to hashinit(), to pass to malloc().
1.19	21-May-1997	gwr	Moved db_kill_proc() and db_show_all_procs() to ddb/db_xxx.c
1.18	08-May-1997	kleink	Pull in the declarations of db_expression() and db_error(), used by db_kill_proc().
1.17	07-May-1997	gwr	Add db_kill_proc() for DDB (and move db_show_all_procs here so all the "proc" debugging stuff is here in one place).
1.16	13-Oct-1996	christos	backout previous kprintf change
1.15	10-Oct-1996	christos	printf -> kprintf, sprintf -> ksprintf
1.14	09-Feb-1996	christos	More proto fixes
1.13	04-Feb-1996	christos	First pass at prototyping
1.12	19-Mar-1995	mycroft	Use %p.
1.11	24-Dec-1994	cgd	various cleanups for -Wall. some inspired by James Jegers.
1.10	30-Aug-1994	mycroft	Convert process, file, and namei lists and hash tables to use queue.h.
1.9	29-Jun-1994	cgd	New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'
1.8	08-Jun-1994	mycroft	Update to 4.4-Lite fs code.
1.7	19-May-1994	cgd	update to lite
1.6	04-May-1994	cgd	Rename a lot of process flags.
1.5	18-Dec-1993	mycroft	Canonicalize all #includes.
1.4	27-Jun-1993	andrew	branches: 1.4.4; ANSIfications - removed all implicit function return types and argument definitions. Ensured that all files include "systm.h" to gain access to general prototypes. Casts where necessary.
1.3	22-May-1993	cgd	add include of select.h if necessary for protos, or delete if extraneous
1.2	18-May-1993	cgd	make kernel select interface be one-stop shopping & clean it all up.
1.1	21-Mar-1993	cgd	branches: 1.1.1; Initial revision
1.1.1.3	01-Mar-1998	fvdl	Import 4.4BSD-Lite2
1.1.1.2	01-Mar-1998	fvdl	Import 4.4BSD-Lite for reference
1.1.1.1	21-Mar-1993	cgd	initial import of 386bsd-0.1 sources
1.4.4.1	14-Nov-1993	mycroft	Canonicalize all #includes.
1.31.8.1	02-Aug-1999	thorpej	Update from trunk.
1.35.2.3	11-Feb-2001	bouyer	Sync with HEAD.
1.35.2.2	22-Nov-2000	bouyer	Sync with HEAD.
1.35.2.1	20-Nov-2000	bouyer	Update thorpej_scsipi to -current as of a month ago
1.41.4.2	26-Apr-2002	he	Pull up revision 1.47 (requested by christos): Use SESSHOLD and SESSRELE consistently, and add them to t_session, so that we do not have dangling references.
1.41.4.1	29-Jul-2001	he	Pull up revision 1.44 (requested by pk): When freeing a session, remove the reference to it from the associated tty.
1.44.8.1	12-Nov-2001	thorpej	Sync the thorpej-mips-cache branch with -current.
1.44.4.5	10-Oct-2002	jdolecek	sync kqueue with -current; this includes merge of gehenna-devsw branch, merge of i386 MP branch, and part of autoconf rototil work
1.44.4.4	06-Sep-2002	jdolecek	sync kqueue branch with HEAD
1.44.4.3	23-Jun-2002	jdolecek	catch up with -current on kqueue branch
1.44.4.2	16-Mar-2002	jdolecek	Catch up with -current.
1.44.4.1	10-Jan-2002	thorpej	Sync kqueue branch with -current.
1.44.2.11	18-Oct-2002	nathanw	Catch up to -current.
1.44.2.10	17-Sep-2002	nathanw	Catch up to -current.
1.44.2.9	01-Aug-2002	nathanw	Catch up to -current.
1.44.2.8	12-Jul-2002	nathanw	No longer need to pull in lwp.h; proc.h pulls it in for us.
1.44.2.7	24-Jun-2002	nathanw	Curproc->curlwp renaming. Change uses of "curproc->l_proc" back to "curproc", which is more like the original use. Bare uses of "curproc" are now "curlwp". "curproc" is now #defined in proc.h as ((curlwp) ? (curlwp)->l_proc) : NULL) so that it is always safe to reference curproc (dereferencing curproc is another story, but that's always been true).
1.44.2.6	17-Apr-2002	nathanw	Catch up to -current.
1.44.2.5	01-Apr-2002	nathanw	Catch up to -current. (CVS: It's not just a program. It's an adventure!)
1.44.2.4	17-Nov-2001	nathanw	Implement POSIX realtime timers, and reimplement getitimer() and setitimer() in terms of them.
1.44.2.3	14-Nov-2001	nathanw	Catch up to -current.
1.44.2.2	09-Jul-2001	nathanw	Move upcall processing to the point of userret() rather than invocation time.
1.44.2.1	05-Mar-2001	nathanw	Initial commit of scheduler activations and lightweight process support.
1.46.2.1	10-Mar-2002	thorpej	Make sure proc structures are aligned to 16 byte boundaries. This ensures that the lower 4 bits of a proc's address are zero. Forthcoming new locking primitives rely on this.
1.47.2.2	29-Aug-2002	gehenna	catch up with -current.
1.47.2.1	15-Jul-2002	gehenna	catch up with -current.
1.54.2.1	18-Dec-2002	gmcgarry	Merge pcred and ucred, and poolify. TBD: check backward compatibility and factor-out some higher-level functionality.
1.64.2.6	11-Dec-2005	christos	Sync with head.
1.64.2.5	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.64.2.4	19-Oct-2004	skrll	Sync with HEAD
1.64.2.3	21-Sep-2004	skrll	Fix the sync with head I botched.
1.64.2.2	18-Sep-2004	skrll	Sync with HEAD.
1.64.2.1	03-Aug-2004	skrll	Sync with HEAD
1.80.12.10	24-Mar-2008	yamt	sync with head.
1.80.12.9	17-Mar-2008	yamt	sync with head.
1.80.12.8	21-Jan-2008	yamt	sync with head
1.80.12.7	07-Dec-2007	yamt	sync with head
1.80.12.6	15-Nov-2007	yamt	sync with head.
1.80.12.5	27-Oct-2007	yamt	sync with head.
1.80.12.4	03-Sep-2007	yamt	sync with head.
1.80.12.3	26-Feb-2007	yamt	sync with head.
1.80.12.2	30-Dec-2006	yamt	sync with head.
1.80.12.1	21-Jun-2006	yamt	sync with head.
1.82.6.1	29-Nov-2005	yamt	sync with head.
1.85.6.2	01-Jun-2006	kardel	Sync with head.
1.85.6.1	22-Apr-2006	simonb	Sync with head.
1.85.4.1	09-Sep-2006	rpaulo	sync with head
1.85.2.1	31-Dec-2005	yamt	uio_segflg/uio_lwp -> uio_vmspace.
1.86.4.5	19-Apr-2006	elad	sync with head.
1.86.4.4	30-Mar-2006	elad	Get rid of some stuff we no longer need here: - suser() - groupmember() - pcred/ucred memory pools - crget(), crfree(), crcmp(), crcopy(), crdup(), crcvt()
1.86.4.3	10-Mar-2006	elad	No need to call kauth_cred_setngroups() here.
1.86.4.2	09-Mar-2006	elad	Namespace cleanup, as requested by yamt@.
1.86.4.1	08-Mar-2006	elad	Adapt to kernel authorization KPI.
1.86.2.5	11-Aug-2006	yamt	sync with head
1.86.2.4	26-Jun-2006	yamt	sync with head.
1.86.2.3	24-May-2006	yamt	sync with head.
1.86.2.2	11-Apr-2006	yamt	sync with head
1.86.2.1	13-Mar-2006	yamt	sync with head.
1.87.2.1	24-May-2006	tron	Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.
1.89.2.1	19-Jun-2006	chap	Sync with head.
1.90.2.1	13-Jul-2006	gdamore	Merge from HEAD.
1.94.6.1	22-Oct-2006	yamt	sync with head
1.94.4.15	08-Feb-2007	skrll	Another typo in a comment.
1.94.4.14	05-Feb-2007	ad	- When clearing signals dequeue siginfo first and free later, once outside the lock permiter. - Push kernel_lock back in a a couple of places. - Adjust limcopy() to be MP safe (this needs redoing). - Fix a couple of bugs noticed along the way. - Catch up with condvar changes.
1.94.4.13	01-Feb-2007	ad	Get sh3 compiling.
1.94.4.12	31-Jan-2007	ad	- Have callers to mi_switch() drop the kernel lock. - Fix a deadlock and some typos. - Unbreak ptrace().
1.94.4.11	30-Jan-2007	ad	Remove support for SA. Ok core@.
1.94.4.10	28-Jan-2007	ad	- Fix sequence error between saving/raising the SPL. - Changes for JavaStation. - Fix bugs with mips & sparc support routines.
1.94.4.9	27-Jan-2007	ad	Drop proclist_mutex and proc::p_smutex back to IPL_VM.
1.94.4.8	25-Jan-2007	ad	Eliminate some uses of mtsleep().
1.94.4.7	29-Dec-2006	ad	Checkpoint work in progress.
1.94.4.6	18-Nov-2006	ad	Sync with head.
1.94.4.5	17-Nov-2006	ad	Checkpoint work in progress.
1.94.4.4	24-Oct-2006	ad	- Redo LWP locking slightly and fix some races. - Fix some locking botches. - Make signal mask / stack per-proc for SA processes. - Add _lwp_kill().
1.94.4.3	21-Oct-2006	ad	Checkpoint work in progress on locking and per-LWP signals. Very much a a work in progress and there is still a lot to do.
1.94.4.2	11-Sep-2006	ad	Grab proclist_mutex in a few more places.
1.94.4.1	11-Sep-2006	ad	- Allocate and free turnstiles where needed. - Split proclist_mutex and alllwp_mutex out of the proclist_lock, and use in interrupt context. - Fix an MP race in enterpgrp()/setsid(). - Acquire proclist_lock and p_crmutex in some obvious places.
1.99.2.1	01-Apr-2007	bouyer	Apply patch (requested by chs in ticket #554): sys/kern/kern_exit.c patch sys/kern/kern_lwp.c patch sys/kern/kern_proc.c patch sys/sys/proc.h patch Add a new SDYING process state. In exit1() release structures before curlwp is NULL. It should fix the problem described in PR 34892.
1.100.2.7	07-May-2007	yamt	sync with head.
1.100.2.6	21-Apr-2007	ad	Some changes mainly for top/ps: - Add an optional name field to struct lwp. - Count the total number of context switches + involuntary, not voluntary + involuntary. - Mark the idle threads as LSIDL when not running, otherwise they show up funny in a top(1) that shows threads. - Make pctcpu and cpticks per-LWP attributes. - Add to kinfo_lwp: cpticks, pctcpu, pid, name.
1.100.2.5	24-Mar-2007	yamt	sync with head.
1.100.2.4	24-Mar-2007	rmind	Checkpoint: - Abstract for per-CPU locking of runqueues. As a workaround for SCHED_4BSD global runqueue, covered by sched_mutex, spc_mutex is a pointer for now. After making SCHED_4BSD runqueues per-CPU, it will became a storage mutex. - suspendsched: Locking is not necessary for cpu_need_resched(). - Remove mutex_spin_exit() prototype in patch.c and LOCK_ASSERT() check in runqueue_nextlwp() in sched_4bsd.c to make them compile again.
1.100.2.3	12-Mar-2007	rmind	Sync with HEAD.
1.100.2.2	27-Feb-2007	yamt	- sync with head. - move sched_changepri back to kern_synch.c as it doesn't know PPQ anymore.
1.100.2.1	17-Feb-2007	yamt	- separate context switching and thread scheduling. - introduce idle lwp. - change some related MD/MI interfaces and implement i386 version.
1.107.2.18	01-Nov-2007	ad	- Fix interactivity problems under high load. Beacuse soft interrupts are being stacked on top of regular LWPs, more often than not aston() was being called on a soft interrupt thread instead of a user thread, meaning that preemption was not happening on EOI. - Don't use bool in a couple of data structures. Sub-word writes are not always atomic and may clobber other fields in the containing word. - For SCHED_4BSD, make p_estcpu per thread (l_estcpu). Rework how the dynamic priority level is calculated - it's much better behaved now. - Kill the l_usrpri/l_priority split now that priorities are no longer directly assigned by tsleep(). There are three fields describing LWP priority: l_priority: Dynamic priority calculated by the scheduler. This does not change for kernel/realtime threads, and always stays within the correct band. Eg for timeshared LWPs it never moves out of the user priority range. This is basically what l_usrpri was before. l_inheritedprio: Lent to the LWP due to priority inheritance (turnstiles). l_kpriority: A boolean value set true the first time an LWP sleeps within the kernel. This indicates that the LWP should get a priority boost as compensation for blocking. lwp_eprio() now does the equivalent of sched_kpri() if the flag is set. The flag is cleared in userret(). - Keep track of scheduling class (OTHER, FIFO, RR) in struct lwp, and use this to make decisions in a few places where we previously tested for a kernel thread. - Partially fix itimers and usr/sys/intr time accounting in the presence of software interrupts. - Use kthread_create() to create idle LWPs. Move priority definitions from the various modules into sys/param.h. - newlwp -> lwp_create
1.107.2.17	27-Oct-2007	yamt	fix priorities for some kernel threads. advised and ok'ed by Andrew Doran.
1.107.2.16	25-Oct-2007	ad	- Simplify debugger/procfs reference counting of processes. Use a per-proc rwlock: rw_tryenter(RW_READER) to gain a reference, and rw_enter(RW_WRITER) by the process itself to drain out reference holders before major changes like exiting. - Fix numerous bugs and locking issues in procfs. - Mark procfs MPSAFE.
1.107.2.15	09-Oct-2007	ad	Sync with head.
1.107.2.14	09-Oct-2007	ad	Sync with head.
1.107.2.13	20-Aug-2007	ad	Sync with HEAD.
1.107.2.12	19-Aug-2007	yamt	proc_free: release proclist_lock earlier as suggested by Andrew Doran. calling lwp_free with the lock held leads a deadlock. 1. CPU1: do_sys_wait -> lwp_free busy-waits for an LWP exiting on CPU2, holding proclist_lock. 2. CPU2: the exiting LWP is interrupted by softclock. 3. CPU2: softclock -> sched_pstats tries to acquire proclist_lock. it also busy-waits because the owning LWP is running.
1.107.2.11	15-Jul-2007	ad	Sync with head.
1.107.2.10	15-Jul-2007	ad	Sync with head.
1.107.2.9	01-Jul-2007	ad	Adapt to callout API change.
1.107.2.8	17-Jun-2007	ad	- Increase the number of thread priorities from 128 to 256. How the space is set up is to be revisited. - Implement soft interrupts as kernel threads. A generic implementation is provided, with hooks for fast-path MD code that can run the interrupt threads over the top of other threads executing in the kernel. - Split vnode::v_flag into three fields, depending on how the flag is locked (by the interlock, by the vnode lock, by the file system). - Miscellaneous locking fixes and improvements.
1.107.2.7	08-Jun-2007	ad	Sync with head.
1.107.2.6	28-Apr-2007	ad	select/poll: - Don't try to awaken LWPs more than once. Prevents unnecessary locking. - Tidy slightly.
1.107.2.5	10-Apr-2007	ad	Changes to select/poll: - Make them MP safe and decouple from the proc locks. - selwakeup: don't call p_find, or traverse per-proc LWP lists (ouch). - selwakeup: don't lock the sleep queue unless we need to.
1.107.2.4	09-Apr-2007	ad	- Add two new arguments to kthread_create1: pri_t pri, bool mpsafe. - Fork kthreads off proc0 as new LWPs, not new processes.
1.107.2.3	05-Apr-2007	ad	- Make context switch counters 64-bit, and count the total number of context switches + voluntary, instead of involuntary + voluntary. - Add lwp::l_swaplock for uvm. - PHOLD/PRELE are replaced.
1.107.2.2	21-Mar-2007	ad	- Put a lock around the proc's CWD info (work in progress). - Replace some more simplelocks. - Make lbolt a condvar.
1.107.2.1	13-Mar-2007	ad	Sync with head.
1.108.2.1	11-Jul-2007	mjf	Sync with head.
1.113.6.8	09-Dec-2007	jmcneill	Sync with HEAD.
1.113.6.7	14-Nov-2007	joerg	Sync with HEAD.
1.113.6.6	11-Nov-2007	joerg	Sync with HEAD.
1.113.6.5	06-Nov-2007	joerg	Sync with HEAD.
1.113.6.4	28-Oct-2007	joerg	Sync with HEAD.
1.113.6.3	26-Oct-2007	joerg	Sync with HEAD. Follow the merge of pmap.c on i386 and amd64 and move pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup code to restore CR4 before jumping back into kernel space as the large page option might cover that.
1.113.6.2	02-Oct-2007	joerg	Sync with HEAD.
1.113.6.1	16-Aug-2007	jmcneill	Sync with HEAD.
1.113.2.2	10-Sep-2007	skrll	Sync with HEAD.
1.113.2.1	15-Aug-2007	skrll	Sync with HEAD.
1.114.2.6	23-Mar-2008	matt	sync with HEAD
1.114.2.5	09-Jan-2008	matt	sync with HEAD
1.114.2.4	08-Nov-2007	matt	sync with -HEAD
1.114.2.3	06-Nov-2007	matt	sync with HEAD
1.114.2.2	30-Aug-2007	matt	Fix inverted test #ifndef -> #ifdef
1.114.2.1	28-Aug-2007	matt	Pre-init the static structures (lwp0,proc0,session0,etc.) whenever possible. Use curlwp_set()
1.116.2.2	14-Oct-2007	yamt	sync with head.
1.116.2.1	06-Oct-2007	yamt	sync with head.
1.118.2.1	13-Nov-2007	bouyer	Sync with HEAD
1.120.2.3	18-Feb-2008	mjf	Sync with HEAD.
1.120.2.2	08-Dec-2007	mjf	Sync with HEAD.
1.120.2.1	19-Nov-2007	mjf	Sync with HEAD.
1.125.2.4	26-Dec-2007	ad	- Push kernel_lock back into exit, wait and sysctl system calls, mainly for visibility. - Serialize calls to brk() from within the same process. - Mark more syscalls MPSAFE.
1.125.2.3	21-Dec-2007	ad	Protect process groups and sessions with tty_lock.
1.125.2.2	15-Dec-2007	ad	- Use pool_cache for a few more items and make those caches static. - Mark another 10 syscalls MPSAFE including execve(). A small bit of work is required to fix a couple of issues (tty, kqueue).
1.125.2.1	08-Dec-2007	ad	Sync with head.
1.127.4.1	02-Jan-2008	bouyer	Sync with HEAD
1.129.6.4	17-Jan-2009	mjf	Sync with HEAD.
1.129.6.3	29-Jun-2008	mjf	Sync with HEAD.
1.129.6.2	02-Jun-2008	mjf	Sync with HEAD.
1.129.6.1	03-Apr-2008	mjf	Sync with HEAD.
1.129.2.1	24-Mar-2008	keiichi	sync with head.
1.135.2.2	04-Jun-2008	yamt	sync with head
1.135.2.1	18-May-2008	yamt	sync with head.
1.139.2.5	11-Aug-2010	yamt	sync with head.
1.139.2.4	11-Mar-2010	yamt	sync with head
1.139.2.3	20-Jun-2009	yamt	sync with head
1.139.2.2	04-May-2009	yamt	sync with head.
1.139.2.1	16-May-2008	yamt	sync with head.
1.141.2.3	18-Sep-2008	wrstuden	Sync with wrstuden-revivesa-base-2.
1.141.2.2	23-Jun-2008	wrstuden	Sync w/ -current. 34 merge conflicts to follow.
1.141.2.1	10-May-2008	wrstuden	Initial checkin of re-adding SA. Everything except kern_sa.c compiles in GENERIC for i386. This is still a work-in-progress, but this checkin covers most of the mechanical work (changing signalling to be able to accomidate SA's process-wide signalling and re-adding includes of sys/sa.h and savar.h). Subsequent changes will be much more interesting. Also, kern_sa.c has received partial cleanup. There's still more to do, though.
1.142.2.1	27-Jun-2008	simonb	Sync with head.
1.143.2.2	13-Dec-2008	haad	Update haad-dm branch to haad-dm-base2.
1.143.2.1	19-Oct-2008	haad	Sync with HEAD.
1.144.2.3	28-Apr-2009	skrll	Sync with HEAD.
1.144.2.2	03-Mar-2009	skrll	Sync with HEAD.
1.144.2.1	19-Jan-2009	skrll	Sync with HEAD.
1.147.2.2	23-Jul-2009	jym	Sync with HEAD.
1.147.2.1	13-May-2009	jym	Sync with HEAD. Commit is split, to avoid a "too many arguments" protocol error.
1.159.2.2	17-Aug-2010	uebayasi	Sync with HEAD.
1.159.2.1	30-Apr-2010	uebayasi	Sync with HEAD.
1.163.2.4	31-May-2011	rmind	sync with head
1.163.2.3	21-Apr-2011	rmind	sync with head
1.163.2.2	05-Mar-2011	rmind	sync with head
1.163.2.1	03-Jul-2010	rmind	sync with head
1.168.2.1	06-Jun-2011	jruoho	Sync with HEAD.
1.169.2.2	05-Mar-2011	bouyer	Sync with HEAD
1.169.2.1	08-Feb-2011	bouyer	Sync with HEAD
1.180.8.3	29-Apr-2012	mrg	sync to latest -current.
1.180.8.2	24-Feb-2012	mrg	sync to -current.
1.180.8.1	18-Feb-2012	mrg	merge to -current.
1.180.4.3	22-May-2014	yamt	sync with head. for a reference, the tree before this commit was tagged as yamt-pagecache-tag8. this commit was splitted into small chunks to avoid a limitation of cvs. ("Protocol error: too many arguments")
1.180.4.2	30-Oct-2012	yamt	sync with head
1.180.4.1	17-Apr-2012	yamt	sync with head
1.181.2.1	12-Jun-2012	riz	Pull up following revision(s) (requested by martin in ticket #310): sys/kern/kern_proc.c: revision 1.184 lib/libkvm/kvm_proc.c: revision 1.89 Measure kinfo_proc2::p_vm_vsize in pages, as it was always documented. This value seems to never have been used anywhere. This makes it consistent with it's cousin p_vm_msize (which is in pages as well and has several uses).
1.186.2.3	03-Dec-2017	jdolecek	update from HEAD
1.186.2.2	20-Aug-2014	tls	Rebase to HEAD as of a few days ago.
1.186.2.1	23-Jun-2013	tls	resync from head
1.187.2.1	18-May-2014	rmind	sync with head
1.192.2.1	10-Aug-2014	tls	Rebase.
1.193.4.7	28-Aug-2017	skrll	Sync with HEAD
1.193.4.6	05-Feb-2017	skrll	Sync with HEAD
1.193.4.5	05-Dec-2016	skrll	Sync with HEAD
1.193.4.4	05-Oct-2016	skrll	Sync with HEAD
1.193.4.3	29-May-2016	skrll	Sync with HEAD
1.193.4.2	22-Apr-2016	skrll	Sync with HEAD
1.193.4.1	27-Dec-2015	skrll	Sync with HEAD (as of 26th Dec)
1.196.2.4	26-Apr-2017	pgoyette	Sync with HEAD
1.196.2.3	20-Mar-2017	pgoyette	Sync with HEAD
1.196.2.2	07-Jan-2017	pgoyette	Sync with HEAD. (Note that most of these changes are simply $NetBSD$ tag issues.)
1.196.2.1	04-Nov-2016	pgoyette	Sync with HEAD
1.199.2.1	21-Apr-2017	bouyer	Sync with HEAD
1.206.6.5	12-Nov-2018	martin	Pull up following revision(s) (requested by maxv in ticket #1088): sys/kern/kern_proc.c: revision 1.219 (via patch) Fix buffer overflow, which can lead to severe information leak. Detected by kASan.
1.206.6.4	16-Apr-2018	martin	Pull up following revision(s) (requested by kamil in ticket #758): sys/kern/kern_proc.c: revision 1.212 Don't set errno ESRCH for empty result of KINFO_PROC[2] Restore the previous behavior as it's prefered. This new behavior was introduced in 1.210. Code should check for length of the result. Requested by <mlelstv>
1.206.6.3	12-Apr-2018	martin	Pull up following revision(s) (requested by kamil in ticket #713): sys/modules/procfs/Makefile: revision 1.4 sys/miscfs/procfs/procfs_vfsops.c: revision 1.98 bin/ps/ps.1: revision 1.108 sys/compat/linux/arch/i386/linux_ptrace.c: revision 1.32 sys/miscfs/procfs/procfs_vnops.c: revision 1.198 sys/kern/sys_ptrace_common.c: revision 1.23 sys/kern/sys_ptrace_common.c: revision 1.24 sbin/mount_procfs/mount_procfs.8: revision 1.36 sys/kern/sys_ptrace_common.c: revision 1.25 sys/kern/sys_ptrace.c: revision 1.5 sys/compat/linux/arch/powerpc/linux_ptrace.c: revision 1.30 sys/sys/proc.h: revision 1.342 sys/kern/sys_ptrace_common.c: revision 1.26 sys/miscfs/procfs/procfs_ctl.c: file removal sys/kern/sys_ptrace_common.c: revision 1.27 sys/miscfs/procfs/procfs_subr.c: revision 1.109 sys/kern/sys_ptrace_common.c: revision 1.28 sys/secmodel/extensions/secmodel_extensions.c: revision 1.8 sys/kern/sys_ptrace_common.c: revision 1.29 sys/sys/ptrace.h: revision 1.62 sys/compat/netbsd32/netbsd32_signal.c: revision 1.45 share/man/man9/kauth.9: revision 1.109 sys/miscfs/procfs/files.procfs: revision 1.12 sys/compat/netbsd32/netbsd32.h: revision 1.115 sys/miscfs/procfs/procfs.h: revision 1.72 sys/compat/netbsd32/netbsd32_ptrace.c: revision 1.5 sys/kern/kern_sig.c: revision 1.337 sys/sys/kauth.h: revision 1.75 sys/sys/sysctl.h: revision 1.224 sys/kern/sys_ptrace_common.c: revision 1.30 sys/kern/sys_ptrace_common.c: revision 1.31 sys/kern/sys_ptrace_common.c: revision 1.32 sys/kern/sys_ptrace_common.c: revision 1.33 sys/compat/linux/arch/arm/linux_ptrace.c: revision 1.20 sys/kern/sys_ptrace_common.c: revision 1.34 sys/kern/sys_ptrace_common.c: revision 1.36 sys/kern/kern_proc.c: revision 1.207 sys/kern/kern_exit.c: revision 1.269 doc/TODO.ptrace: revision 1.29 Make {s,g}et{db,fp,}regs work again for PK_32 processes XXX: pullup-8 add disgusting magic to handle compat_netbsd32 as a module. use process_reg32 instead of struct reg32. Remove the filesystem tracing feature This is a legacy interface from 4.4BSD, and it was introduced to overcome shortcomings of ptrace(2) at that time, which are no longer relevant (performance). Today /proc/#/ctl offers a narrow subset of ptrace(2) commands and is not applicable for modern applications use beyond simplistic tracing scenarios. This removal will simplify kernel internals. Users will still be able to use all the other /proc files. This change won't affect other procfs files neither Linux compat features within mount_procfs(8). /proc/#/ctl isn't available on Linux. Remove: - /proc/#/ctl from mount_procfs(8) - P_FSTRACE note from the documentation of ps(1) - /proc/#/ctl and filesystem tracing documentation from mount_procfs(8) - KAUTH_REQ_PROCESS_PROCFS_CTL documentation from kauth(9) - source code file miscfs/procfs/procfs_ctl.c - PFSctl and procfs_doctl() from sys/miscfs/procfs/procfs.h - KAUTH_REQ_PROCESS_PROCFS_CTL from sys/sys/kauth.h - PSL_FSTRACE (0x00010000) from sys/sys/proc.h - P_FSTRACE (0x00010000) from sys/sys/sysctl.h Reduce code complexity after removal of this functionality. Update TODO.ptrace accordingly: remove two entries about /proc tracing. Do not keep legacy notes as comments in the headers about removed PSL_FSTRACE / P_FSTRACE, as this interface had little number of users (close or equal to zero). Proposed on tech-kern@. All filesystem tracing utility users are encouraged to switch to ptrace(2). Sponsored by <The NetBSD Foundation> untangle the mess: - factor out common code - break each ptrace subcall to its own sub-function .. more to come ... - reduce ifdef ugliness by moving it up top. - factor out PT_IO and make PT_{READ,WRITE}_{I,D} use it - factor out PT_DUMPCORE - factor out sendsig code .. more to come ... handle siginfo requests for ptrace32 ptrace: Partially undo PT_{READ,WRITE}_{I,D} and unbreak these commands The refactored code did not work and was generating EFAULT. Sponsored by <The NetBSD Foundation> Merge the code back; the problem was that since we are reading/writing to a kernel address for PT_{READ,WRITE}_{I,D} we need the kernel vmspace. provide separate read and write functions to accomodate register functions that need a size argument. don't ignore error from copyout_piod Use the proper process (the tracee) to get information about lwps and registers and the tracer for vmspace. Add new sysctl(3) entry: security.models.extensions.user_set_dbregs Model this new sysctl(3) entry after "user_set_cpu_affinity" in the same level of sysctl(3) switches. Allow to read unconditionally Debug Registers (no change here). This is convenient as even if a user of a debugger does not use hardware assisted watchpoints/breakpoints, a debugger can still prompt these values to store in an internal cache with context of registers. Reading them should have no security concerns. Add a paranoid MI switch that prohibits by default setting these registers by a regular user (non-superuser). Make this switch disabled by default. There are enough reserved bits out there to allow using them unconditionally on hardened hosts. Features shipped with Debug Registers are optional features in debuggers. There is no reduction in elementary functionality. Reviewed by <christos> Sponsored by <The NetBSD Foundation>
1.206.6.2	01-Apr-2018	martin	Pull up following revision(s) (requested by kamil in ticket #679): sys/kern/kern_proc.c: revision 1.211 Make sysctl_doeproc() more predictable Swap the order of looking into zombie and all process lists, start now with the zombie one. This prevents a race observed previously that the same process could be detected on both lists during a single polling call. While there: - Short-circuit break for KERN_PROC_PID, once a pid has been detected. - Removal of redundant "if (kbuf)" and "if (marker)" checks. - Update of comments regarding potential optimization, explaining why we don't want to it as of now. Performance gain from lookup call vs iteration over a list is neglible on a regular system. - Return ESRCH when no results have been found. This allows more easily to implement a retry or abandon algorithm. This corrects races observed in the existing ATF ptrace(2) tests, related to await_zombie(). This function was expecting to check whether a process has been transformed into a zombie, however it was causing occasional crashes as it was overflowing the return buffer, returning the same pid twice: once from allproc list and the second time from zombieproc one. Fix suggested by <christos> Short-circuit break suggested by <kre> Discussed on tech-kern. Sponsored by <The NetBSD Foundation>
1.206.6.1	01-Jan-2018	snj	Pull up following revision(s) (requested by maxv in ticket #465): sys/kern/kern_proc.c: revision 1.209 If no auxv is present, don't kmem_alloc(0). Easy to panic the kernel by typing 'cat /proc/aout_pid/auxv' on whatever a.out binary you're running. Fortunately, amd64 does not enable EXEC_AOUT by default. Unfortunately, i386 does enable it by default.
1.209.2.15	22-Jan-2019	pgoyette	Convert the MODULE_{,VOID_}HOOK_CALL macros to do everything in-line rather than defining an intermediate hook##call function. Almost all of the hooks are called only once, and although we lose the ability of doing things like if (MODULE_HOOK_CALL(...) == 0) ... we simplify things quite a bit. With this change, we no longer need to have both declaration and definition macros, and the definition no longer needs to have both prototype argument list and a "real" argument list. FWIW, the above if now needs to written as int ret; MODULE_HOOK_CALL(..., ret); if (ret == 0) ... with appropriate use of braces {}.
1.209.2.14	21-Jan-2019	pgoyette	No need to declare the hook_call() function for void hooks. So remove and simplify.
1.209.2.13	18-Jan-2019	pgoyette	Don't restrict hooks to having only int or void types. Pass the hook's type to the various macros, as needed. Allows us to reduce diffs to original in at least one or two places (we no longer have to provide an additional parameter to the hook routine for returning a non-int return value).
1.209.2.12	14-Jan-2019	pgoyette	Create a variant of the HOOK macros that handles hook routines of type void, and use them where appropriate.
1.209.2.11	13-Jan-2019	pgoyette	Remove the HOOK2 versions of the MODULE_HOOK macros. There were only a few uses, and using them led to some lack of clarity in the code. Instead, we now use two separate hooks, with names that make it clear(er) what we're doing. This also positions us to start unraveling some of the rtsock_50 mess, which will need (at least) five hooks.
1.209.2.10	26-Dec-2018	pgoyette	Sync with HEAD, resolve a few conflicts
1.209.2.9	26-Nov-2018	pgoyette	Sync with HEAD, resolve a couple of conflicts
1.209.2.8	20-Oct-2018	pgoyette	Sync with head
1.209.2.7	29-Sep-2018	pgoyette	In MODULE_HOOK_CALL_DECL we don't need to provide the actual argument list for calling the hook function, nor do we need to provide the default value (for when the hook has not been set).
1.209.2.6	23-Sep-2018	pgoyette	Use the proper test: _RUMPKERNEL vs _RUMP_KERNEL
1.209.2.5	23-Sep-2018	pgoyette	This hook doesn't exist for _RUMPSERVER
1.209.2.4	23-Sep-2018	pgoyette	More work on kern_proc_32
1.209.2.3	06-Sep-2018	pgoyette	Sync with HEAD Resolve a couple of conflicts (result of the uimin/uimax changes)
1.209.2.2	16-Apr-2018	pgoyette	Sync with HEAD, resolve some conflicts
1.209.2.1	15-Mar-2018	pgoyette	Synch with HEAD
1.212.2.3	21-Apr-2020	martin	Sync with HEAD
1.212.2.2	13-Apr-2020	martin	Mostly merge changes from HEAD upto 20200411
1.212.2.1	10-Jun-2019	christos	Sync with HEAD
1.233.2.2	07-Aug-2024	martin	Pull up following revision(s) (requested by kre in ticket #1859): sys/kern/kern_proc.c: revision 1.276 (via patch) sys/kern/kern_ktrace.c: revision 1.185 (via patch) sys/kern/sys_sig.c: revision 1.58 (via patch) sys/kern/kern_descrip.c: revision 1.263 (via patch) lib/libc/compat-43/killpg.c: revision 1.10 sys/kern/tty.c: revision 1.313 (via patch) tests/lib/libc/sys/t_kill.c: revision 1.2 PR kern/58425 -- Disallow INT_MIN as a (negative) pid arg. Since -INT_MIN is undefined, and to point of negative pid args is to negate them, and use the result as a pgrp id instead, we need to avoid accidentally negating INT_MIN. Since pid_t is just an integral type, of unspecified width, when testing pid_t value test for <= INT_MIN (or > INT_MIN sometimes) rather than == INT_MIN. When testing int values, just == INT_MIN is all that is needed, < INT_MIN cannot occur. tests/lib/libc/sys/t_kill: Test kill(INT_MIN, ...) fails with ESRCH. PR kern/58425
1.233.2.1	06-Aug-2019	martin	Pull up following revision(s) (requested by kamil in ticket #20): sys/kern/kern_proc.c: revision 1.234 Update our vm resource use for sysctl(3) call reading kinfo_proc* Without this change RSS properties are zeroed unless a process exits or calls getrusage(2).
1.239.2.2	29-Feb-2020	ad	Sync with head.
1.239.2.1	25-Jan-2020	ad	Make cwdinfo use mostly lockless, and largely hide the details in vfs_cwd.c.
1.243.2.2	25-Apr-2020	bouyer	Sync with bouyer-xenpvh-base2 (HEAD)
1.243.2.1	20-Apr-2020	bouyer	Sync with HEAD
1.261.2.1	03-Jan-2021	thorpej	Sync w/ HEAD.
1.269.2.1	07-Aug-2024	martin	Pull up following revision(s) (requested by kre in ticket #773): sys/kern/kern_proc.c: revision 1.276 sys/kern/kern_ktrace.c: revision 1.185 sys/kern/sys_sig.c: revision 1.58 sys/kern/kern_descrip.c: revision 1.263 lib/libc/compat-43/killpg.c: revision 1.10 sys/kern/tty.c: revision 1.313 tests/lib/libc/sys/t_kill.c: revision 1.2 PR kern/58425 -- Disallow INT_MIN as a (negative) pid arg. Since -INT_MIN is undefined, and to point of negative pid args is to negate them, and use the result as a pgrp id instead, we need to avoid accidentally negating INT_MIN. Since pid_t is just an integral type, of unspecified width, when testing pid_t value test for <= INT_MIN (or > INT_MIN sometimes) rather than == INT_MIN. When testing int values, just == INT_MIN is all that is needed, < INT_MIN cannot occur. tests/lib/libc/sys/t_kill: Test kill(INT_MIN, ...) fails with ESRCH. PR kern/58425

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