Rework the way kernel include files are installed. In the new method,
as with user-land programs, include files are installed by each directory
in the tree that has includes to install. (This allows more flexibility
as to what gets installed, makes 'partial installs' easier, and gives us
more options as to which machines' includes get installed at any given
time.) The old SYS_INCLUDES={symlinks,copies} behaviours are _both_
still supported, though at least one bug in the 'symlinks' case is
fixed by this change. Include files can't be build before installation,
so directories that have includes as targets (e.g. dev/pci) have to move
those targets into a different Makefile.

g/c, it's outdated and the info wouldn't belong here anyway

PR/7143: Jaromir Docelek: Add procfs/cmdline from Linux emulation

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Update to 4.4-Lite fs code, with local changes.

Make procfs really work for debugging.
Implement not & notepg files in procfs.

branches: 1.1.1;
add new procfs code, from Jan-Simon Pendry, jsp@sequent.com.
This is pretty-much "virgin", so that diffs can be done later.

add a node for the process resource limits.

branches: 1.12.4;
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>

branches: 1.11.6;
add an auxv node.

branches: 1.10.2;
* Split sys/kern/sys_process.c into three parts:
1 - ptrace(2) syscall for native emulation
2 - common ptrace(2) syscall code (shared with compat_netbsd32)
3 - support routines that are shared with PROCFS and/or KTRACE

* Add module glue for #1 and #2. Both modules will be built-in to the
kernel if "options PTRACE" is included in the config file (this is
the default, defined in sys/conf/std).

* Mark the ptrace(2) syscall as modular in syscalls.master (generated
files will be committed shortly).

* Conditionalize all remaining portions of PTRACE code on a new kernel
option PTRACE_HOOKS.

XXX Instead of PROCFS depending on 'options PTRACE', we should probably
just add a procfs attribute to the sys/kern/sys_process.c file's
entry in files.kern, and add PROCFS to the "#if defineds" for
process_domem(). It's really confusing to have two different ways
of requiring this file.

branches: 1.9.2; 1.9.4;
Define filesystem attributes with vfs dependency.

branches: 1.8.102;
Restore dependency on PTRACE for PROCFS.
Bump required config(1) version.

revert previous as it breaks the build due to invalid syntax

Make PTRACE and COREDUMP optional. Make the default (status quo) by putting
them in conf/std.

branches: 1.5.4; 1.5.8;
merge ktrace-lwp.

branches: 1.4.4;
nuke trailing whitespace

branches: 1.3.2; 1.3.10; 1.3.12;
Implement /proc/<pid>/fd/<n>. This is work in progress. Questionable things:
- Is it ok to convert DTYPE_PIPE to VFIFO and DTYPE_SOCKET to VSOCK?
- XXX: Avoid locking issue in ls -Rl /proc by avoiding curproc
- Does I/O to pipes work?
- XXX: Are there security implications?

branches: 1.2.6; 1.2.8;
Move code shared by procfs and the kernel proper out of procfs and
into the kernel proper (renaming functions from procfs_* to process_*).

Cleanup how file system configuration information is declared, grouping
related information together, with the file system code itself.

This is just low-hanging fruit -- more to come.

Clean up deleted files.

Changes to VFS readdir semantics
NFS changes for better cookie support
ISOFS changes for better Rockridge support and support for generation numbers

Implement setattr: mode for process entries; mode + uid/gid for the
PROCFS root directory.
Fixed omission in pfs_root() which came to light as a result of the above:
hold on to vnode for root dir.

Fixed improperly initialized nfsnode in pfs_lookup()

copyright update.

Rcs Id added.

Initial version of a proc filesystem.

Add linux POSIX message queue support (Ricardo Branco)

branches: 1.86.2;
PR/58227: Ricardo Branco: Add support for proc/sysvipc in Linux emulator

PR/58240: Ricardo Branco: Add support for proc/self/limits as used by Linux

Using the exechook to revoke procfs nodes is racy and may deadlock:

one thread runs doexechooks() -> procfs_revoke_vnodes() and wants to suspend
the file system for vgone(), while another thread runs a forced unmount,
has the file system suspended, tries to disestablish the exechook and
waits for doexechooks() to complete.

Establish/disestablish the exechook on module load/unload instead
mount/unmount and use the hashmap to access all procfs nodes for this pid.

May fix PR kern/57775 ""panic: unmount: dangling vnode" while umounting procfs"

Add a hashmap to access all procfs nodes by pid.

branches: 1.82.4;
Now that an inline function dereferences it, make sure struct proc
is declared by including sys/proc.h here.

If the calling process is running under linux emulation, make /proc/xxx/fd/
return only symlinks pointing to the original file in the filesystem,
instead of a hard link. This matches the linux behavior, and some
linux programs relies on it (they unconditionally call readlink() on
/proc/xxx/fd/yy and don't deal with it returning EINVAL).
Proposed on tech-kern@ in
http://mail-index.netbsd.org/tech-kern/2022/01/11/msg027877.html

Put forward declaration a little further forward to unbreak build.

If the procfs mount is marked as linux-compat, then allow proc lookup
by any LWP ID in the proc, not just the canonical PID.

VFS_VGET(), VFS_ROOT(), VFS_FHTOVP(): give them a "int lktype" argument, to
allow us to get shared locks (or no lock) on the returned vnode. Matches
FreeBSD.

branches: 1.77.2;
Rewrite the procfs_fileno as an inline function to make it more clear what
it does...

Restore mapping of file id to pid/type/fd.
Use 64bit file id to allow for 32bit fd and 25-26bit pid.

add a node for the process resource limits.

branches: 1.74.4;
rename some "cmdline" stuff now that it is used to print environment too

Add an environ node

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>

branches: 1.71.6;
add an auxv node.

branches: 1.70.4; 1.70.8; 1.70.12;
Change procfs from hashlist to vcache.
- Key is (type, pid, fd)
- Remove argument "p" from procfs_allocvp(). It is only used
when "type == PFSfd". Lookup the proc with proc_find() when
procfs_loadvnode() needs it.
- Use a vfs_vnode_iterator for procfs_revoke_vnodes().

branches: 1.69.2;
On my 24 proc box I got ENOSPC, so make the routine return the size it wants
and try again.

branches: 1.68.2; 1.68.4;
add a task process subdirectory for emul linux

branches: 1.67.2; 1.67.6;
define PROCFS_MAXNAMLEN and use it.

PR# kern/45021: Please support /emul/linux/proc/version

Add /proc/version for procfs with -o linux. The version reported depends
on the emulation type of the calling process:

$ cat /proc/version
NetBSD version 5.99.55 (netbsd@localhost) (gcc version 4.1.3 20080704 prerelease (NetBSD nb2 20081120)) NetBSD 5.99.55 (GENERIC) #39: Sun Sep 4 09:10:05 EDT 2011

$ /emul/linux/bin/cat /proc/version
Linux version 2.6.18 (linux@localhost) (gcc version 4.1.3 20080704 prerelease (NetBSD nb2 20081120)) #0 Wed Mar 3 03:03:03 PST 2010

$ /emul/linux32/bin/cat /proc/version
Linux version 2.6.18 (linux32@localhost) (gcc version 4.1.3 20080704 prerelease (NetBSD nb2 20081120)) #0 Wed Mar 3 03:03:03 PST 2010

Create sysctl entries during module initialisation and destroy them
appropriately.

Many of these file systems are now ready for modularisation.

branches: 1.64.28; 1.64.32; 1.64.34; 1.64.36;
Extend the Linux emulation of /proc to include

/proc/stat
/proc/loadavg and
/proc/<pid>/statm.

These are only present when -o linux is specified as a mount option
to procfs.

Factor out some common code so that it can be used by a number of
functions.

XXX The values returned in the statm emulation need to be verified.

branches: 1.63.6; 1.63.8;
Merge newlock2 to head.

add an "emul" file node.

1. fix procfs_validfile{,_linux} to test for NULL pointers properly.
2. make "exe" entry be a symlink to the executable, instead of pointing
directly to the vnode of the executable.
3. factor out commonly used code.

Emulate Linux's /proc/devices

branches: 1.59.20; 1.59.22;
merge ktrace-lwp.

Add "cwd" and "root" symlinks to each process's directory. The cwd
link points to the process's current working directory, and the root
link points to the process's root directory. What else would you
expect?

For directories that are out of reach (caller is in a chroot, target
process is in a different chroot, etc), the links point to "/"
instead.

Remove __P()

branches: 1.56.12;
add 'mounts' file for -o linux, which lists all currently mounted
filesystems; Linux glibc statvfs() uses this to get some of mount flags,
and this file is also useful as /emul/linux/etc/mtab (via symlink)

Do previous slightly differently - just pass a struct lwp * and derive the
struct proc *.

OK'd by Jaromir.

fix process used for /proc/<pid>/stat contents - it should be process
<pid>, not the current process looking at the information

Tweak sysctl setup functions (the macros, actually) for use in lkms,
and tweak lkminit_*.c (where applicable) to call them, and to call
sysctl_teardown() when being unloaded.

This consists of (1) making setup functions not be static when being
compiled as lkms (change to sys/sysctl.h), (2) making prototypes
visible for the various setup functions in header files (changes to
various header files), and (3) making simple "load" and "unload"
functions in the actual lkminit stuff.

linux_sysctl.c also needs its root exposed (ie, made not static) for
this (when built as an lkm).

branches: 1.52.2;
a little bit more namespace sanity

terminate snprintb 'new' format strings correctly.
(fixes overrun in mount_*)

Put pfsnode in the #ifdef _KERNEL too, so this actually compiles.

Changes as discussed with itojun on tech-kern. I have modified the enums
to have KFS or PFS differentiators. Further I have wrapped the enum in
procfs in "#ifdef _KERNEL" as it is done in kernfs.

To see the discussion go to http://mail-index.NetBSD.org/tech-kern/2003/09/
and look for "Mismatched enums in include files" in the list.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.47.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Undo part of the ktrace/lwp changes. In particular:
* Remove the "lwp *" argument that was added to vget(). Turns out
that nothing actually used it!
* Remove the "lwp *" arguments that were added to VFS_ROOT(), VFS_VGET(),
and VFS_FHTOVP(); all they did was pass it to vget() (which, as noted
above, didn't use it).
* Remove all of the "lwp *" arguments to internal functions that were added
just to appease the above.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Add /proc/<pid>/stat for linux compat. j2sdk1.4.2 depends on it.

change PROCFS_FILENO() to use 5 bits for 'type', since there are more than
16 types nowadays (i.e. Pfd is 17)

use fd_getfile() in procfs_getfp(), and FILE_USE()/FILE_UNUSE() the
returned file descriptor pointer appropriately

This addresses PR kerm/19989. Thanks to hamajima@nagoya.ydc.co.jp for submitting this patch which enables /proc/uptime for linux emul. Patch reviewed by atatat@netbsd.org and tron@netbsd.org, approved by tron@netbsd.org.

Merge the nathanw_sa branch.

Implement /proc/<pid>/fd/<n>. This is work in progress. Questionable things:
- Is it ok to convert DTYPE_PIPE to VFIFO and DTYPE_SOCKET to VSOCK?
- XXX: Avoid locking issue in ls -Rl /proc by avoiding curproc
- Does I/O to pipes work?
- XXX: Are there security implications?

MNT_GETARGS support

Move code shared by procfs and the kernel proper out of procfs and
into the kernel proper (renaming functions from procfs_* to process_*).

* Allow machine-dependent code to specify hooks for ptrace(2)
(__HAVE_PTRACE_MACHDEP) and procfs (__HAVE_PROCFS_MACHDEP).
These changes will allow platforms like x86 (XMM) and PowerPC
(AltiVec) to export extended register sets in a sane manner.

* Use __HAVE_PTRACE_MACHDEP to export x86 XMM registers (standard
FP + SSE/SSE2) using PT_{GET,SET}XMMREGS (in the machdep
ptrace request space).
* Use __HAVE_PROCFS_MACHDEP to export x86 XMM registers via
/proc/N/xmmregs in procfs.

add a new VFS op, vfs_reinit, which is called when desiredvnodes is
adjusted via sysctl. file systems that have hash tables which are
sized based on the value of this variable now resize those hash tables
using the new value. the max number of FFS softdeps is also recalculated.

convert various file systems to use the <sys/queue.h> macros for
their hash tables.

branches: 1.34.2; 1.34.4;
For -o linux mounts, add some code to emulate /proc/#/maps.
Needs NAMECACHE_ENTER_REVERSE to include filenames.

branches: 1.33.2;
g/c pmnt_mp in struct procfs_args

constify

Add a few linux-style files, only enabled when -o linux is specified
for the mount. Currently these are /proc/cpuinfo and /proc/meminfo.
The former only does something on i386 right now.

remove dead code and other misc cleanup.

branches: 1.29.4;
Add new VFS op routine - vfs_done and call it on filesystem detach
in vfs_detach(). vfs_done may free global filesystem's resources,
typically those allocated in respective filesystem's init function.
Needed so those filesystems which went in via LKM have a chance to
clean after themselves before unloading. This fixes random panics
when LKM for filesystem using pools was loaded and unloaded several
times.

For each leaf filesystem, add appropriate vfs_done routine.

At mount/unmount time, add an exec hook to revoke all vnodes iff the
process is about to exec a sugid binary.

To speed up things, use hashing for vnode allocation, like other filesystems
do. This avoids walking the whole procfs node list in the revoke case too.

branches: 1.27.2;
Make /proc/self a symlink to /proc/curproc. I've observed Linux programs
that expect /proc/self/cmdline to exist.

branches: 1.26.2;
completely remove Mach VM support. all that is left is the all the
header files as UVM still uses (most of) these.

Expose procfs_rwmem(). (This function will go away entirely when we
delete Mach VM.)

PR/7143: Jaromir Docelek: Add procfs/cmdline from Linux emulation

Add /proc/#/map. From FreeBSD.

bzero->memset, bcopy->memcpy, bcmp->memcmp

Merge with Lite2 + local changes

Fix a reversed argument which caused procfs_checkioperm() to always return
"OK". Add a few comments to avoid further confusion.

Fix the procfs hole described on current-users, similar to a fix for
FreeBSD by Sean Eric Fagan, but a bit different. This makes the checks
in the same places as sef's FreeBSD patch, but does not hardcode the
"kmem" group into the kernel, and also does a check identical to the
(3) and (4) checks in the NetBSD ptrace(2):

(1) it's not owned by you, or is set-id on exec (unless
you're root), or

(2) it's init, which controls the security level of the
entire system, and the system was not compiled with
permanently insecure mode turned on.

branches: 1.18.4;
Pass the vnode type to vaccess(), and use it when checking VEXEC. Make sure
that the mode bits passed to vaccess() and returned by foo_getattr() contain
only permission bits.

close PR/2063: procfs_rw prototyped twice with different prototypes

miscfs prototype changes

Fix vop_link, vop_symlink, and vop_remove semantics in several ways:
* Change the argument names to vop_link so they actually make sense.
* Implement vop_link and vop_symlink for all file systems, so they do proper
cleanup.
* Require the file system to decide whether or not linking and unlinking of
directories is allowed, and disable it for all current file systems.

Add support for cookies, mostly from Greg Hudson.

KERNEL -> _KERNEL

light clean; make sure headers are properly included, types are OK, etc.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Minor update from JSP after merging my changes.

Update to 4.4-Lite fs code, with local changes.

be a bit smarter about determining if files shouldn't be seen by the user.
Also, DON'T allow a lookup to succeed on a file that's not visible!

If you add files, be sure to have enough bits to encode an inode number!

make a fpregs file.

Make procfs really work for debugging.
Implement not & notepg files in procfs.

Fix ugliness left over from my last mod

Bug fixes and enhancements:
Make NFS serving work (BUT DON'T USE "attach" TO /proc/*/ctl FOR NOW!!!)
Make `curproc' a symbolic link
Add `.' and `..' entries to the directories.
Return better guesses on the size of the files.

fix UFS vs 'real' fs type mixups

branches: 1.1.1;
add new procfs code, from Jan-Simon Pendry, jsp@sequent.com.
This is pretty-much "virgin", so that diffs can be done later.

Instead of casting to size_t, cast to uintmax_t to prevent truncation
(pointed out by chuq). In all these cases uio_offset can't be negative.

fix sign-compare issues: uio->uio_offset (off_t) is compared with (size_t):
cast the offset to size_t.

branches: 1.2.4; 1.2.6; 1.2.14; 1.2.18; 1.2.22;
remove comment.

add an auxv node.

Remove unnecessary include of <sys/malloc.h>.

Instead of casting to size_t, cast to uintmax_t to prevent truncation
(pointed out by chuq). In all these cases uio_offset can't be negative.

fix sign-compare issues: uio->uio_offset (off_t) is compared with (size_t):
cast the offset to size_t.

branches: 1.30.4;
rename some "cmdline" stuff now that it is used to print environment too

Add an environ node

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.

branches: 1.27.22; 1.27.28; 1.27.30;
Remove clause 3 and 4 from TNF licenses

branches: 1.26.38; 1.26.40; 1.26.42;
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.

branches: 1.25.2;
Merge newlock2 to head.

PR/32877: Geoff C. Wing: mount_procfs(8) doesn't null-terminate cmdline
output

Patch applied, thanks!

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.21.14; 1.21.16;
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.

branches: 1.20.2; 1.20.4; 1.20.6;
merge ktrace-lwp.

branches: 1.19.4;
nuke trailing whitespace

branches: 1.18.4; 1.18.6;
sprintf -> snprintf

branches: 1.17.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Fix signed/unsigned comparison warnings.

Move code shared by procfs and the kernel proper out of procfs and
into the kernel proper (renaming functions from procfs_* to process_*).

don't need <sys/types.h> when including <sys/param.h>

add RCSIDs

branches: 1.11.2; 1.11.4; 1.11.8;
Add support for variable end of user stacks needed to support COMPAT_NETBSD32:

`struct vmspace' has a new field `vm_minsaddr' which is the user TOS.

PS_STRINGS is deprecated in favor of curproc->p_pstr which is derived
from `vm_minsaddr'.

Bump the kernel version number.

PHOLD/PRELE around uvm_io() to user address space is unnecessary. There
is nothing in the U-area that we need.

<vm/vm.h> -> <uvm/uvm_extern.h>

branches: 1.8.2;
Fix a possible kernel memory leak - if the cmdline of a process was
requested after it had started to exit but before it became a zombie
a page of kernel memory wouldn't be free'd.

branches: 1.7.2;
Apply patch from Robert Elz in PR kern/10113. This fixes two problems
with procfs's cmdline - from the PR:

The cmdline implementation in procfs is bogus. It's possible that
part of the fix is a workaround of a UVM problem - that is, when
(internally) accessing the top of the process VM (the end of the
args) a request for I/0 of a PAGE_SIZE'd block starting at less
than a PAGE_SIZE from the end of the mem space returns EINVAL
rather than the data that is available. Whether this is a bug
in UVM or not depends upon how it is defined to work, and I was
unable to determine that. (Simon Burge found that problem, and
provided the basis of the workaround/fix).

Then, the cmdline function is unable to read more than one
page of args, and a good thing too, as the way it is written
attempting to get more than that would reference into lala land.

And, on an attempt to read a lot of data when the above is
fixed, most of the data won't be returned, only the final block
of any read.

Tested on alpha, pmax, i386 and sparc.

branches: 1.6.2;
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.

Fix excessive memory usage, and fix handling of SZOMB processes. PR #7164,
Jaromir Dolecek.

branches: 1.4.2;
completely remove Mach VM support. all that is left is the all the
header files as UVM still uses (most of) these.

malloc the arg temporary buffer, rather than declaring it as an automatic
array of ARG_MAX size. ARG_MAX is currently 256k, which causes a rather
serious stack overflow (kernel stacks are not very large, usually 8k).

Fixes memory corruption problems observed after accessig /proc/1/cmdline
during tests. Problem in my case manifested itself as massive lossage
in ffs_sync(), resulting in a crash, and sometimes, pooched file systems.

XXX This could, and probably should, be rewritten to use a much smaller
temporary buffer, and a loop around uiomove().

Some changes to `cmdline' to make it work properly:
- Don't error out on P_SYSTEM or SZOMB processes; instead, do what ps(1)
would do, i.e. the p_comm in parenthesis.
- Use uvm_io() (or procfs_rwmem() if !UVM) to read the target process's
psstrings and argument vector. Using copyin() is problematic, because
it operates on the current processes! That is, the old code would
always get the `cmdline' of the process reading the file, not that of
the target process.

PR/7143: Jaromir Docelek: Add procfs/cmdline from Linux emulation

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>

branches: 1.48.10;
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>

branches: 1.47.22; 1.47.40;
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>.

ANSIfy another 1261 function definitions.
The only ones left in sys are beyond by sed script!
(or in sys/dist or sys/external)
Mostly they have function pointer parameters.

branches: 1.45.2; 1.45.10; 1.45.16;
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.

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.

branches: 1.43.6; 1.43.8;
Tons of process scope changes.

- Add a KAUTH_PROCESS_SCHEDULER action, to handle scheduler related
requests, and add specific requests for set/get scheduler policy and
set/get scheduler parameters.

- Add a KAUTH_PROCESS_KEVENT_FILTER action, to handle kevent(2) related
requests.

- Add a KAUTH_DEVICE_TTY_STI action to handle requests to TIOCSTI.

- Add requests for the KAUTH_PROCESS_CANSEE action, indicating what
process information is being looked at (entry itself, args, env,
open files).

- Add requests for the KAUTH_PROCESS_RLIMIT action indicating set/get.

- Add requests for the KAUTH_PROCESS_CORENAME action indicating set/get.

- Make bsd44 secmodel code handle the newly added rqeuests appropriately.

All of the above make it possible to issue finer-grained kauth(9) calls in
many places, removing some KAUTH_GENERIC_ISSUSER requests.

- Remove the "CAN" from KAUTH_PROCESS_CAN{KTRACE,PROCFS,PTRACE,SIGNAL}.

Discussed with christos@ and yamt@.

branches: 1.42.6;
Merge from vmlocking:

- pool_cache changes.
- Debugger/procfs locking fixes.
- Other minor changes.

branches: 1.41.6; 1.41.8; 1.41.12; 1.41.14;
Merge some of the less invasive changes from the vmlocking branch:

- kthread, callout, devsw API changes
- select()/poll() improvements
- miscellaneous MT safety improvements

branches: 1.40.2; 1.40.4;
- 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.

branches: 1.39.2;
Merge newlock2 to head.

Some changes to get rid of another KAUTH_GENERIC_ISSUSER usage:
- Make procfs_control() in procfs_ctl.c static,
- Add an argument to the above, 'pfs', for the pfsnode,
- Add another request type to KAUTH_PROCESS_CANPROCFS named
KAUTH_REQ_PROCESS_CANPROCFS_CTL (and update documentation),
- Use the above combination in a call to kauth_authorize_process().

branches: 1.37.2;
Remove redundant securelevel check; this is already done in procfs_rw()
and we can't get here (procfs_control()) without being there first.

Pointed out by yamt@.

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.34.2; 1.34.4;
add missing initializers

Use the LWP cached credentials where sane.

integrate kauth.

branches: 1.31.2; 1.31.4;
cleanup more SET/CLR/ISSET lossage

branches: 1.30.4; 1.30.6; 1.30.8;
merge ktrace-lwp.

Remove __P()

branches: 1.28.4;
nuke trailing whitespace

branches: 1.27.8; 1.27.10;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.26.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Merge the nathanw_sa branch.

branches: 1.23.2;
Make sure that the pointer to old parent process for ptraced children
gets reset properly when the old parent exits before the child. A flag
is set in old parent process when the child is reparented in ptrace(2).
If it's set when process is exiting, all running processes have their
'old parent process' pointer checked and reset if appropriate. Also
change to use 'struct proc *' pointer directly, rather than pid_t.
This fixes security/14444 by David Sainty.

Reviewed by Christos Zoulas.

branches: 1.22.8; 1.22.10;
Apply the same P_INEXEC test to avoid the execve/trace problem using
the procfs ptrace calls.

* Allow machine-dependent code to specify hooks for ptrace(2)
(__HAVE_PTRACE_MACHDEP) and procfs (__HAVE_PROCFS_MACHDEP).
These changes will allow platforms like x86 (XMM) and PowerPC
(AltiVec) to export extended register sets in a sane manner.

* Use __HAVE_PTRACE_MACHDEP to export x86 XMM registers (standard
FP + SSE/SSE2) using PT_{GET,SET}XMMREGS (in the machdep
ptrace request space).
* Use __HAVE_PROCFS_MACHDEP to export x86 XMM registers via
/proc/N/xmmregs in procfs.

add RCSIDs

branches: 1.19.2; 1.19.4; 1.19.8;
constify

Add a lock around the scheduler, and use it as necessary, including
in the non-MULTIPROCESSOR case (LOCKDEBUG requires it). Scheduler
lock is held upon entry to mi_switch() and cpu_switch(), and
cpu_switch() releases the lock before returning.

Largely from Bill Sommerfeld, with some minor bug fixes and
machine-dependent code hacking from me.

branches: 1.17.2; 1.17.12;
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.

branches: 1.16.16; 1.16.18;
Reinstate P_FSTRACE, with different semantics:
* Never send a SIGCHLD to the parent if P_FSTRACE is set.
* Do not permit mixing ptrace(2) and procfs; only permit using the one that
was attached.

Fix several deficiencies, as compared to ptrace(2):
* Did not check for P_SUGID on ATTACH.
* Did not check for tracing of init on ATTACH.
* Did not turn off single-step mode on RUN or DETACH.
* Might have screwed up reparenting in some cases.
* Allowed anyone to detach the process.

miscfs prototype changes

Lock the process in core before operating on it.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Minor update from JSP after merging my changes.

Update to 4.4-Lite fs code, with local changes.

setrun rename

Rename a lot of process flags.

Make procfs really work for debugging.
Implement not & notepg files in procfs.

fix some of my more recent botches, and clean up slightly.

oops. fix that last

minor cleanup; kill a few assignments

Bug fixes and enhancements:
Make NFS serving work (BUT DON'T USE "attach" TO /proc/*/ctl FOR NOW!!!)
Make `curproc' a symbolic link
Add `.' and `..' entries to the directories.
Return better guesses on the size of the files.

reorganization of ptrace/procfs code

branches: 1.1.1;
add new procfs code, from Jan-Simon Pendry, jsp@sequent.com.
This is pretty-much "virgin", so that diffs can be done later.

Remove clause 3 and 4 from TNF licenses

branches: 1.13.2; 1.13.4;
Catch up with descriptor handling changes. See kern_descrip.c revision
1.173 for details.

branches: 1.12.14;
Merge from vmlocking:

- pool_cache changes.
- Debugger/procfs locking fixes.
- Other minor changes.

branches: 1.11.6; 1.11.18; 1.11.20; 1.11.24; 1.11.26;
Merge newlock2 to head.

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.8.4; 1.8.6;
Use the LWP cached credentials where sane.

integrate kauth.

branches: 1.6.4; 1.6.6; 1.6.8; 1.6.10; 1.6.12;
merge ktrace-lwp.

branches: 1.5.2; 1.5.18;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Add breaks which were forgotten in rev. 1.2 change.
Inspired from a report by HIRATSUKA Kouichirou in tech-pkg-ja mailing list.

use fd_getfile() in procfs_getfp(), and FILE_USE()/FILE_UNUSE() the
returned file descriptor pointer appropriately

branches: 1.1.2;
Implement /proc/<pid>/fd/<n>. This is work in progress. Questionable things:
- Is it ok to convert DTYPE_PIPE to VFIFO and DTYPE_SOCKET to VSOCK?
- XXX: Avoid locking issue in ls -Rl /proc by avoiding curproc
- Does I/O to pipes work?
- XXX: Are there security implications?

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.15.20; 1.15.22;
merge ktrace-lwp.

branches: 1.14.16;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.13.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Merge the nathanw_sa branch.

Move code shared by procfs and the kernel proper out of procfs and
into the kernel proper (renaming functions from procfs_* to process_*).

* Allow machine-dependent code to specify hooks for ptrace(2)
(__HAVE_PTRACE_MACHDEP) and procfs (__HAVE_PROCFS_MACHDEP).
These changes will allow platforms like x86 (XMM) and PowerPC
(AltiVec) to export extended register sets in a sane manner.

* Use __HAVE_PTRACE_MACHDEP to export x86 XMM registers (standard
FP + SSE/SSE2) using PT_{GET,SET}XMMREGS (in the machdep
ptrace request space).
* Use __HAVE_PROCFS_MACHDEP to export x86 XMM registers via
/proc/N/xmmregs in procfs.

add RCSIDs

branches: 1.7.2; 1.7.4; 1.7.8;
Add a few linux-style files, only enabled when -o linux is specified
for the mount. Currently these are /proc/cpuinfo and /proc/meminfo.
The former only does something on i386 right now.

branches: 1.6.18; 1.6.28;
Fix a reversed argument which caused procfs_checkioperm() to always return
"OK". Add a few comments to avoid further confusion.

Fix the procfs hole described on current-users, similar to a fix for
FreeBSD by Sean Eric Fagan, but a bit different. This makes the checks
in the same places as sef's FreeBSD patch, but does not hardcode the
"kmem" group into the kernel, and also does a check identical to the
(3) and (4) checks in the NetBSD ptrace(2):

(1) it's not owned by you, or is set-id on exec (unless
you're root), or

(2) it's init, which controls the security level of the
entire system, and the system was not compiled with
permanently insecure mode turned on.

branches: 1.4.14;
Lock the process in core before operating on it.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Minor update from JSP after merging my changes.

branches: 1.1.1;
Update to 4.4-Lite fs code, with local changes.

PR/58240: Ricardo Branco: Add support for proc/self/limits as used by Linux

Move proc_lock into the data segment. It was dynamically allocated because
at the time we had mutex_obj_alloc() but not __cacheline_aligned.

Instead of casting to size_t, cast to uintmax_t to prevent truncation
(pointed out by chuq). In all these cases uio_offset can't be negative.

fix sign-compare issues: uio->uio_offset (off_t) is compared with (size_t):
cast the offset to size_t.

branches: 1.1.4;
add a node for the process resource limits.

Define dependencies based on build options.

Add linux POSIX message queue support (Ricardo Branco)

branches: 1.88.2;
PR/58227: Ricardo Branco: Add support for proc/sysvipc in Linux emulator

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@

Counter tweaks:

- Don't need to count anonpages+filepages any more; clean+unknown+dirty for
each kind of page can be summed to get the totals.

- Track the number of free pages with a counter so that it's one less thing
for the allocator to do, which opens up further options there.

- Remove cpu_count_sync_one(). It has no users and doesn't save a whole lot.
For the cheap option, give cpu_count_sync() a boolean parameter indicating
that a cached value is okay, and rate limit the updates for cached values
to hz.

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.

struct statvfs is too large for stack. Use malloc(9) instead.

XXX
Switch to kmem(9) for entire this file.

Frame size, e.g. for m68k, becomes:
3292 --> 12

Move proc_lock into the data segment. It was dynamically allocated because
at the time we had mutex_obj_alloc() but not __cacheline_aligned.

Add missing include of <sys/atomic.h> to fix the build

- 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.

branches: 1.80.6;
- Eliminate the global "boottime" variable, which was being accessed
without any synchronization against changes by e.g. clock_settime().
- Replace with new getbinboottime() / getnanoboottime() / getmicroboottime()
functions (naming mirrors that of other time access functions in kern_tc.c).
It returns the (maybe-converted) value of timebasebin, which also tracks
our estimate of when the system was booted (i.e. the legacy "boottime" was
redundant).

XXX There needs to be a lockless synchronization mechanism for reading
timebasebin, but this is a problem in kern_tc.c that pre-existed these
"boottime" changes. At least now the problem is centralized in one location.

Rename uvm_free() -> uvm_availmem().

uvmexp.free -> uvm_free()

- Extend the per-CPU counters matt@ did to include all of the hot counters
in UVM, excluding uvmexp.free, which needs special treatment and will be
done with a separate commit. Cuts system time for a build by 20-25% on
a 48 CPU machine w/DIAGNOSTIC.

- Avoid 64-bit integer divide on every fault (for rnd_add_uint32).

have procfs_do_pid_stat() pass the proc's map to get_proc_size_info(),
rather than having the latter look up the map again and not check
for an error.

Fix info leaks.

branches: 1.74.4;
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

branches: 1.73.4; 1.73.10; 1.73.12;
Switch procfs_domounts() to mountlist iterator.

branches: 1.72.2; 1.72.4;
Align /proc/<pid>/statm data with /proc/<pid>/stat and
provide RSS information. There is no data about shared
pages.

Helps PR 50801.

Unused inits (harmless).

Found by Brainy.

branches: 1.70.2; 1.70.4; 1.70.10;
#include <sys/cpu.h>

Use kproc2 to provide sensible informations for /proc/<pid>/stat.

Use NZERO instead of hard-coded "20" value.

branches: 1.67.2;
On my 24 proc box I got ENOSPC, so make the routine return the size it wants
and try again.

Change the queue.3 *_END(&head) macros to NULL. Since we don't have CIRCLEQ
anymore, all the macros expand to NULL anyway, so this improves readability.
Requested by rmind@

change the mountlist CIRCLEQ into a TAILQ

branches: 1.64.6; 1.64.10;
don't produce different output if we are super user.

provide a root entry if one was not found.

PR/45700: use dostatvfs instead of grabbing the latest cached copy of
struct statvfs from the mount point, so that chroot is handled properly.

branches: 1.61.2; 1.61.6;
PR# kern/45021: Please support /emul/linux/proc/version

Add /proc/version for procfs with -o linux. The version reported depends
on the emulation type of the calling process:

$ cat /proc/version
NetBSD version 5.99.55 (netbsd@localhost) (gcc version 4.1.3 20080704 prerelease (NetBSD nb2 20081120)) NetBSD 5.99.55 (GENERIC) #39: Sun Sep 4 09:10:05 EDT 2011

$ /emul/linux/bin/cat /proc/version
Linux version 2.6.18 (linux@localhost) (gcc version 4.1.3 20080704 prerelease (NetBSD nb2 20081120)) #0 Wed Mar 3 03:03:03 PST 2010

$ /emul/linux32/bin/cat /proc/version
Linux version 2.6.18 (linux32@localhost) (gcc version 4.1.3 20080704 prerelease (NetBSD nb2 20081120)) #0 Wed Mar 3 03:03:03 PST 2010

both LINUX_USRSTACK32 and USRSTACK32 need to be defined for linux32

Move counting of faults, traps, intrs, soft[intr]s, syscalls, and nswtch
from uvmexp to per-cpu cpu_data and move them to 64bits. Remove unneeded
includes of <uvm/uvm_extern.h> and/or <uvm/uvm.h>.

branches: 1.58.4;
Avoid leaking pages. Fixes PR 42053 from SHIMIZU Ryo.

this change was somehow missed.

merge christos-time_t

Rename specfs_lock as device_lock and move it from specfs to devsw.
Relaxes kernel dependency on vfs.

branches: 1.54.6; 1.54.8; 1.54.14;
Kill devsw_lock and just use specfs_lock. The two would need merging
in order to prevent unload of modules when a device that they provide
is still open.

branches: 1.53.2;
PR kern/38141 lookup/vfs_busy acquire rwlock recursively

Simplify the mount locking. Remove all the crud to deal with recursion on
the mount lock, and crud to deal with unmount as another weirdo lock.

Hopefully this will once and for all fix the deadlocks with this. With this
commit there are two locks on each mount:

- krwlock_t mnt_unmounting. This is used to prevent unmount across critical
sections like getnewvnode(). It's only ever read locked with rw_tryenter(),
and is only ever write locked in dounmount(). A write hold can't be taken
on this lock if the current LWP could hold a vnode lock.

- kmutex_t mnt_updating. This is taken by threads updating the mount, for
example when going r/o -> r/w, and is only present to serialize updates.
In order to take this lock, a read hold must first be taken on
mnt_unmounting, and the two need to be held across the operation.

One effect of this change: previously if an unmount failed, we would make a
half hearted attempt to back out of it gracefully, but that was unlikely to
work in a lot of cases. Now while an unmount that will be aborted is in
progress, new file operations within the mount will fail instead of being
delayed. That is unlikely to be a problem though, because if the admin
requests unmount of a file system then s(he) has made a decision to deny
access to the resource.

PR kern/38135 vfs_busy/vfs_trybusy confusion

The previous fix worked, but it opened a window where mounts could have
disappeared from mountlist while the caller was traversing it using
vfs_trybusy(). Fix that.

kern/38135 vfs_busy/vfs_trybusy confusion

The symptom was that sometimes file systems would occasionally not appear
in output from 'df' or 'mount' if the system was busy. Resolution:

- Make mount locks work somewhat like vm_map locks.
- vfs_trybusy() now only fails if the mount is gone, or if someone is
unmounting the file system. Simple contention on mnt_lock doesn't
cause it to fail.
- vfs_busy() will wait even if the file system is being unmounted.

branches: 1.50.2;
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.

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.

branches: 1.48.6; 1.48.8; 1.48.10;
PR kern/37706 (forced unmount of file systems is unsafe):

- Do reference counting for 'struct mount'. Each vnode associated with a
mount takes a reference, and in turn the mount takes a reference to the
vfsops.
- Now that mounts are reference counted, replace the overcomplicated mount
locking inherited from 4.4BSD with a recursable rwlock.

procfs_douptime: simply use microuptime() instead of a mysterious calculation.

procfs_docpustat: g/c a write-only variable.

branches: 1.45.2; 1.45.6;
Revision 1.42 was lost. Pointed out by Nicolas Joly:

This was using mutex_exit where mutex_enter was required.

report the proper stack size on 32 bit emulations.

Merge from vmlocking:

- pool_cache changes.
- Debugger/procfs locking fixes.
- Other minor changes.

branches: 1.42.2; 1.42.4;
This was using mutex_exit where mutex_enter was required.

Merge from vmlocking:

- Split vnode::v_flag into three fields, depending on field locking.
- simple_lock -> kmutex in a few places.
- Fix some simple locking problems.

Merge run time accounting changes from the vmlocking branch. These make
the LWP "start time" per-thread instead of per-CPU.

branches: 1.39.6; 1.39.8; 1.39.10;
In /proc/<pid>/statm, avoid leaking buffer space if the attempt to get
vmspace information fails.

Return the nice value properly to userland via the /proc/<pid>/stat entry.

Use vm sizes from vmspace, rather than rusage structs, for the same
reasons as mentioned previously - see the comment in
kvm_proc.c::kvm_getproc2() about rusage values and zombie processes.

Use a bit more common code for the MULTIPROCESSOR and !MULTIPROCESSOR
cases.

Use the lwp's priority when returning the priority value, rather than
returning the nice value.

Various changes for better Linux emulation:

+ in /proc/<pid>/statm emulation, use the memory values from vmspace,
rather than struct rusage, since the rusage values appear to be 0 for
all processes except zombies. cf dsl's comment in
kvm_proc.c::kvm_getproc2()

+ in /proc/<pid>/stat, instead of returning the tv_sec value, return the
number of ticks we've had (roughly equivalent to the Linux jiffies).
Calculate these values from the tv_usec values.

Also:

+ enclose CPU_INFO_ITERATOR and CPU_INFO_FOREACH usage in #ifdef
MULTIPROCESSOR, at the request of Nick Hudson

Together, these changes allow htop to work on NetBSD.

use PRIu64, not llu, to unbork on 64-bit platforms.

Extend the Linux emulation of /proc to include

/proc/stat
/proc/loadavg and
/proc/<pid>/statm.

These are only present when -o linux is specified as a mount option
to procfs.

Factor out some common code so that it can be used by a number of
functions.

XXX The values returned in the statm emulation need to be verified.

return a page less than the actual top of stack so that linux-java works.

branches: 1.33.2; 1.33.4;
- 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.

branches: 1.32.2;
Merge newlock2 to head.

Add two comments. No functional change.

__unused removal on arguments; approved by core.

don't allocate large buffers on the stack.

PR/34888: Nicolas Joly: kernel panic while trying to access
/emul/linux/proc/0/stat

Patch applied, thanks for the report!

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

Emulate Linux's /proc/devices

branches: 1.25.4; 1.25.6;
PR/33815: Nicolas Joly: /emul/linux/proc/#/stat always report current
process status

branches: 1.24.4; 1.24.8; 1.24.16;
merge ktrace-lwp.

branches: 1.23.2;
- sprinkle const
- avoid shadowed variables.

branches: 1.22.2; 1.22.4;
Remove bogus len setting noted by J. Chapman Flack.

Give more space for cpu info and allocate it dynamically.

nuke trailing whitespace

branches: 1.19.4; 1.19.6;
add 'mounts' file for -o linux, which lists all currently mounted
filesystems; Linux glibc statvfs() uses this to get some of mount flags,
and this file is also useful as /emul/linux/etc/mtab (via symlink)

Do previous slightly differently - just pass a struct lwp * and derive the
struct proc *.

OK'd by Jaromir.

fix process used for /proc/<pid>/stat contents - it should be process
<pid>, not the current process looking at the information

sprintf -> snprintf

branches: 1.15.2;
t_pgrp can be null.

Add casts of LINUX_USRSTACK and USRSTACK to handle the cases
where these are not constants.

LINUX_USRSTACK is only defined on i386. Thanks Izumi!

Only choose the linux usrstack if the netbsd usrstack was higher.

Change the way we compute the top of the stack. This makes java-1.4.2 work.

branches: 1.10.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Change "%qu" to "PRIu64" to make it compile on sparc64.

Add /proc/<pid>/stat for linux compat. j2sdk1.4.2 depends on it.

Change "%llu" to "PRIu64" to make it compile on sparc64.

This addresses PR kerm/19989. Thanks to hamajima@nagoya.ydc.co.jp for submitting this patch which enables /proc/uptime for linux emul. Patch reviewed by atatat@netbsd.org and tron@netbsd.org, approved by tron@netbsd.org.

replace "vnode" and "vtext" with "file" and "exec" in uvmexp field names.

add RCSIDs

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.10;
No-op revision to force update of this file to a non-"-kk" version.

branches: 1.1.2;
Add a few linux-style files, only enabled when -o linux is specified
for the mount. Currently these are /proc/cpuinfo and /proc/meminfo.
The former only does something on i386 right now.

Instead of casting to size_t, cast to uintmax_t to prevent truncation
(pointed out by chuq). In all these cases uio_offset can't be negative.

fix sign-compare issues: uio->uio_offset (off_t) is compared with (size_t):
cast the offset to size_t.

branches: 1.45.20;
Maps don't change that frequently between reads, so don't give up and
do what linux does (support reading from an offset).

branches: 1.44.4; 1.44.8;
Merge riastradh-drm2 to HEAD.

PR/48048: Add a missing vm_map_unlock_read() and uvmspace_free() to the ENOMEM error case in procfs_domap()d

branches: 1.42.2; 1.42.4; 1.42.10;
- match format with the linux map printing
- fix PK_32 map printing for linux processes
should fix 32 bit java stack guard setting.

branches: 1.41.2; 1.41.6; 1.41.8; 1.41.12; 1.41.14;
VOP_GETATTR() needs a shared lock at least.

fix a botch in PRIxVADDR change (rev.1.38)

Use PRIxVADDR to print vaddr_t elements. Wrap lines.

branches: 1.38.2; 1.38.4;
gimpy invented PRIxVADDR format specifier.

merge christos-time_t

branches: 1.36.2; 1.36.6; 1.36.12;
use bufsize instead of BUFFERSIZE

Handle files with a large number of mappings gracefully. Reported by Nicholas
Joly.

branches: 1.34.6; 1.34.10; 1.34.12; 1.34.14; 1.34.16;
use vnode_to_path.

branches: 1.33.2; 1.33.6;
Remove the "struct lwp *" argument from all VFS and VOP interfaces.
The general trend is to remove it from all kernel interfaces and
this is a start. In case the calling lwp is desired, curlwp should
be used.

quick consensus on tech-kern

branches: 1.32.4; 1.32.6; 1.32.12; 1.32.14;
nuke homegrown getcwd_common() decl

branches: 1.31.4;
Instead of reading and writing little by little, allocate memory and
write the whole map in one shot so that we don't have to deal with the
map changing under us. Fixes the linux emulated jdk-1.6 where it was
losing the last map entry and could not find the stack on startup.

branches: 1.30.4; 1.30.6;
procfs_map():

- Drop the target's vm_map lock before calling uiomove(). We could
deadlock if inspecting /proc/curproc/map.
- If the vm_map might have changed, restart the operation, but give
up after 250 retries if the map keeps changing. XXX This is not
ideal.

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.

branches: 1.28.2;
Merge newlock2 to head.

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.25.4; 1.25.6;
Use the LWP cached credentials where sane.

integrate kauth.

branches: 1.23.4; 1.23.6; 1.23.8; 1.23.10; 1.23.12;
merge ktrace-lwp.

Remove __P()

branches: 1.21.4;
nuke trailing whitespace

branches: 1.20.8; 1.20.10;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.19.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Undo part of the ktrace/lwp changes. In particular:
* Remove the "lwp *" argument that was added to vget(). Turns out
that nothing actually used it!
* Remove the "lwp *" arguments that were added to VFS_ROOT(), VFS_VGET(),
and VFS_FHTOVP(); all they did was pass it to vget() (which, as noted
above, didn't use it).
* Remove all of the "lwp *" arguments to internal functions that were added
just to appease the above.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Fix signed/unsigned comparison warnings.

add RCSIDs

Remove some variables that are set but never used.

branches: 1.13.2; 1.13.6;
replace vm_map{,_entry}_t with struct vm_map{,_entry} *.

Cast `field-width' arguments to type `int'.

For -o linux mounts, add some code to emulate /proc/#/maps.
Needs NAMECACHE_ENTER_REVERSE to include filenames.

branches: 1.10.2;
Add a few linux-style files, only enabled when -o linux is specified
for the mount. Currently these are /proc/cpuinfo and /proc/meminfo.
The former only does something on i386 right now.

remove dead code and other misc cleanup.

<vm/vm.h> -> <uvm/uvm_extern.h>

remove redudant <vm/pmap.h> includes. <vm/pmap.h> -> <uvm/uvm_pmap.h>

remove some redundant <vm/vm_xxx.h> includes

branches: 1.5.2; 1.5.12;
remove unneeded <vm/vm_object.h>

branches: 1.4.4;
completely remove Mach VM support. all that is left is the all the
header files as UVM still uses (most of) these.

sprintf->snprintf

make it compile with !UVM

Add /proc/#/map. From FreeBSD.

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.35.20; 1.35.22;
merge ktrace-lwp.

branches: 1.34.16;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.33.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Move code shared by procfs and the kernel proper out of procfs and
into the kernel proper (renaming functions from procfs_* to process_*).

When checking for permissions, include the P_INEXEC test and return
EAGAIN if the process is exec'ing.

add RCSIDs

In procfs_domem() the addr variable is only needed if PMAP_NEED_PROCWR is
defined.

branches: 1.27.2; 1.27.4; 1.27.8;
remove dead code and other misc cleanup.

PHOLD/PRELE around uvm_io() to user address space is unnecessary. There
is nothing in the U-area that we need.

<vm/vm.h> -> <uvm/uvm_extern.h>

remove/move more mach vm header files:

<vm/pglist.h> -> <uvm/uvm_pglist.h>
<vm/vm_inherit.h> -> <uvm/uvm_inherit.h>
<vm/vm_kern.h> -> into <uvm/uvm_extern.h>
<vm/vm_object.h> -> nothing
<vm/vm_pager.h> -> into <uvm/uvm_pager.h>

also includes a bunch of <vm/vm_page.h> include removals (due to redudancy
with <vm/vm.h>), and a scattering of other similar headers.

branches: 1.23.2; 1.23.8; 1.23.18;
Disallow tracing of processes unless tracer's root directory is at or
above tracee's root directory.

completely remove Mach VM support. all that is left is the all the
header files as UVM still uses (most of) these.

Expose procfs_rwmem(). (This function will go away entirely when we
delete Mach VM.)

Machine independent part of fix for PR 6152 (gdb doesn't work on machines
with UVM and seperate I&D-Cache). Mostly by Michael Hitch, but pass struct
proc * instead of the pmap. Reason: said machine will need a method to do
the syncing operation for "curproc", too; this way more code can be shared.

Merge paddr_t changes into the main branch.

branches: 1.18.2;
- add defopt's for UVM, UVMHIST and PMAP_NEW.
- remove unnecessary UVMHIST_DECL's.

initial import of the new virtual memory system, UVM, into -current.

UVM was written by chuck cranor <chuck@maria.wustl.edu>, with some
minor portions derived from the old Mach code. i provided some help
getting swap and paging working, and other bug fixes/ideas. chuck
silvers <chuq@chuq.com> also provided some other fixes.

this is the rest of the MI portion changes.

this will be KNF'd shortly. :-)

Use the same indentation as other two place, sys_ptrace() and
procfs_control().

Ok'ed by Jason R. Thorpe.

PR/4098: Alan Barrett: Fix diagnostic printf formatting.

Fix a reversed argument which caused procfs_checkioperm() to always return
"OK". Add a few comments to avoid further confusion.

Move procfs_checkioperm() from procvs_subr.c to procfs_mem.c, since _subr is
not included in a kernel without procfs, and it seems wrong to pull
all of procfs_subr.c in for just that one function. Perhaps this
should go into a new file instead?

Fix the procfs hole described on current-users, similar to a fix for
FreeBSD by Sean Eric Fagan, but a bit different. This makes the checks
in the same places as sef's FreeBSD patch, but does not hardcode the
"kmem" group into the kernel, and also does a check identical to the
(3) and (4) checks in the NetBSD ptrace(2):

(1) it's not owned by you, or is set-id on exec (unless
you're root), or

(2) it's init, which controls the security level of the
entire system, and the system was not compiled with
permanently insecure mode turned on.

branches: 1.11.10;
backout previous kprintf changes

printf -> kprintf, sprintf -> ksprintf

Add a missing PHOLD()/PRELE() pair.

branches: 1.8.4;
miscfs prototype changes

initialize variable as pointed out by David Jones <dej@qpoint.torfree.net>
this should fix pr #699

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Minor update from JSP after merging my changes.

Update to 4.4-Lite fs code, with local changes.

PG_COW -> PG_COPYONWRITE to match earlier changes in vm_page.h.

make it compile (cleanly) for us

branches: 1.1.1;
add new procfs code, from Jan-Simon Pendry, jsp@sequent.com.
This is pretty-much "virgin", so that diffs can be done later.

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.13.20; 1.13.22;
merge ktrace-lwp.

branches: 1.12.16;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.11.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

add RCSIDs

branches: 1.8.46; 1.8.48; 1.8.52;
New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Minor update from JSP after merging my changes.

Update to 4.4-Lite fs code, with local changes.

lots of changes: prototype migration, move lots of variables, definitions,
and structure elements around. kill some unnecessary type and macro
definitions. standardize clock handling. More changes than you'd want.

kill obvious bug; glad to know this was tested!

Rename a lot of process flags.

Make procfs really work for debugging.
Implement not & notepg files in procfs.

branches: 1.1.1;
add new procfs code, from Jan-Simon Pendry, jsp@sequent.com.
This is pretty-much "virgin", so that diffs can be done later.

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.21.20; 1.21.22;
merge ktrace-lwp.

branches: 1.20.16;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.19.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Merge the nathanw_sa branch.

Move code shared by procfs and the kernel proper out of procfs and
into the kernel proper (renaming functions from procfs_* to process_*).

Don't hide the real return code with EPERM.

* Allow machine-dependent code to specify hooks for ptrace(2)
(__HAVE_PTRACE_MACHDEP) and procfs (__HAVE_PROCFS_MACHDEP).
These changes will allow platforms like x86 (XMM) and PowerPC
(AltiVec) to export extended register sets in a sane manner.

* Use __HAVE_PTRACE_MACHDEP to export x86 XMM registers (standard
FP + SSE/SSE2) using PT_{GET,SET}XMMREGS (in the machdep
ptrace request space).
* Use __HAVE_PROCFS_MACHDEP to export x86 XMM registers via
/proc/N/xmmregs in procfs.

add RCSIDs

branches: 1.12.2; 1.12.4; 1.12.8;
Add a few linux-style files, only enabled when -o linux is specified
for the mount. Currently these are /proc/cpuinfo and /proc/meminfo.
The former only does something on i386 right now.

branches: 1.11.12; 1.11.18; 1.11.28;
Fix a reversed argument which caused procfs_checkioperm() to always return
"OK". Add a few comments to avoid further confusion.

Fix the procfs hole described on current-users, similar to a fix for
FreeBSD by Sean Eric Fagan, but a bit different. This makes the checks
in the same places as sef's FreeBSD patch, but does not hardcode the
"kmem" group into the kernel, and also does a check identical to the
(3) and (4) checks in the NetBSD ptrace(2):

(1) it's not owned by you, or is set-id on exec (unless
you're root), or

(2) it's init, which controls the security level of the
entire system, and the system was not compiled with
permanently insecure mode turned on.

branches: 1.9.14;
Lock the process in core before operating on it.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Minor update from JSP after merging my changes.

Update to 4.4-Lite fs code, with local changes.

Rename a lot of process flags.

be a bit smarter about determining if files shouldn't be seen by the user.
Also, DON'T allow a lookup to succeed on a file that's not visible!

make a fpregs file.

reorganization of ptrace/procfs code

branches: 1.1.1;
add new procfs code, from Jan-Simon Pendry, jsp@sequent.com.
This is pretty-much "virgin", so that diffs can be done later.

Move proc_lock into the data segment. It was dynamically allocated because
at the time we had mutex_obj_alloc() but not __cacheline_aligned.

Use %ju and (intmax_t) to unbreak i386 build.

Split the status printing routines (one for NetBSD and one for Linux) for
simplicity (Robert Swindelis)

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 ?

branches: 1.36.22; 1.36.40; 1.36.44;
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>.

merge christos-time_t

branches: 1.34.2; 1.34.10;
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.

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.

branches: 1.32.36; 1.32.38; 1.32.40;
- 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.

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.

branches: 1.30.2;
Merge newlock2 to head.

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.27.8; 1.27.10;
integrate kauth.

branches: 1.26.4; 1.26.6; 1.26.8; 1.26.10; 1.26.12;
merge ktrace-lwp.

branches: 1.25.2;
- sprinkle const
- avoid shadowed variables.

nuke trailing whitespace

branches: 1.23.4; 1.23.6;
sprintf -> snprintf

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.21.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Merge the nathanw_sa branch.

Fix signed/unsigned comparison warnings.

add RCSIDs

branches: 1.16.2; 1.16.4; 1.16.6; 1.16.8;
Increase psbuf size as in FreeBSD patch. We don't have jail(8), so the
recent bugtraq exploit doesn't apply, but it could be exploitable in
other ways.

branches: 1.15.12;
bzero->memset, bcopy->memcpy, bcmp->memcmp

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>.

backout previous kprintf changes

printf -> kprintf, sprintf -> ksprintf

Fix printf format follies.

Moved egid credential from cr_groups[0] to new field cr_gid. POSIX.1
requires that sgid executables and the setuid() syscall *not* change
the supplemental group list.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Minor update from JSP after merging my changes.

Fix a bug pointed out by JSP.

Update to 4.4-Lite fs code, with local changes.

lots of changes: prototype migration, move lots of variables, definitions,
and structure elements around. kill some unnecessary type and macro
definitions. standardize clock handling. More changes than you'd want.

Rename a lot of process flags.

Fix sign extension bug

Bug fixes and enhancements:
Make NFS serving work (BUT DON'T USE "attach" TO /proc/*/ctl FOR NOW!!!)
Make `curproc' a symbolic link
Add `.' and `..' entries to the directories.
Return better guesses on the size of the files.

branches: 1.1.1;
add new procfs code, from Jan-Simon Pendry, jsp@sequent.com.
This is pretty-much "virgin", so that diffs can be done later.

Add linux POSIX message queue support (Ricardo Branco)

branches: 1.119.2;
PR/58227: Ricardo Branco: Add support for proc/sysvipc in Linux emulator

PR/58240: Ricardo Branco: Add support for proc/self/limits as used by Linux

Using the exechook to revoke procfs nodes is racy and may deadlock:

one thread runs doexechooks() -> procfs_revoke_vnodes() and wants to suspend
the file system for vgone(), while another thread runs a forced unmount,
has the file system suspended, tries to disestablish the exechook and
waits for doexechooks() to complete.

Establish/disestablish the exechook on module load/unload instead
mount/unmount and use the hashmap to access all procfs nodes for this pid.

May fix PR kern/57775 ""panic: unmount: dangling vnode" while umounting procfs"

branches: 1.116.20;
Move proc_lock into the data segment. It was dynamically allocated because
at the time we had mutex_obj_alloc() but not __cacheline_aligned.

If the procfs mount is marked as linux-compat, then allow proc lookup
by any LWP ID in the proc, not just the canonical PID.

fix sign-compare issues: uio->uio_offset (off_t) is compared with (size_t):
cast the offset to size_t.

add a node for the process resource limits.

branches: 1.112.2;
Change procfs_revoke_vnodes() to use vrecycle()/vgone() instead
of VOP_REVOKE().

Gets rid of a bunch of suspensions on /proc as vrecycle() will
succeed most time and we suspend at most once per call.

branches: 1.111.2;
rename some "cmdline" stuff now that it is used to print environment too

Add an environ node

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>

branches: 1.108.6;
KASSERT(mutex_owned(vp->v_interlock)) in vnode iterator selector.

add an auxv node.

branches: 1.106.2; 1.106.4; 1.106.6;
Do not uselessly include <sys/malloc.h>.

branches: 1.105.2;
Change procfs from hashlist to vcache.
- Key is (type, pid, fd)
- Remove argument "p" from procfs_allocvp(). It is only used
when "type == PFSfd". Lookup the proc with proc_find() when
procfs_loadvnode() needs it.
- Use a vfs_vnode_iterator for procfs_revoke_vnodes().

branches: 1.104.2;
Change vnode operation lookup to return the resulting vnode *vpp unlocked.
Change cache_lookup() to return an unlocked vnode.

Discussed on tech-kern@

Welcome to 6.99.31

Vnode API cleanup pass 1.

- Make these defines and functions private to vfs_vnode.c:

VC_MASK, VC_LOCK, DOCLOSE, VI_IANCTREDO and VI_INACTNOW
vclean() and vrelel()

- Remove the long time unused lwp argument from vrecycle().

- Remove vtryget(), it is responsible for ugly hacks and doesn't
look that effective.

Presented on tech-kern.

Welcome to 6.99.25

branches: 1.102.2;
do something reasonable with kernel semaphores.

branches: 1.101.2;
add a task process subdirectory for emul linux

branches: 1.100.2; 1.100.6;
PR# kern/45021: Please support /emul/linux/proc/version

Add /proc/version for procfs with -o linux. The version reported depends
on the emulation type of the calling process:

$ cat /proc/version
NetBSD version 5.99.55 (netbsd@localhost) (gcc version 4.1.3 20080704 prerelease (NetBSD nb2 20081120)) NetBSD 5.99.55 (GENERIC) #39: Sun Sep 4 09:10:05 EDT 2011

$ /emul/linux/bin/cat /proc/version
Linux version 2.6.18 (linux@localhost) (gcc version 4.1.3 20080704 prerelease (NetBSD nb2 20081120)) #0 Wed Mar 3 03:03:03 PST 2010

$ /emul/linux32/bin/cat /proc/version
Linux version 2.6.18 (linux32@localhost) (gcc version 4.1.3 20080704 prerelease (NetBSD nb2 20081120)) #0 Wed Mar 3 03:03:03 PST 2010

Welcome to 5.99.53! Merge rmind-uvmplock branch:

- Reorganize locking in UVM and provide extra serialisation for pmap(9).
New lock order: [vmpage-owner-lock] -> pmap-lock.

- Simplify locking in some pmap(9) modules by removing P->V locking.

- Use lock object on vmobjlock (and thus vnode_t::v_interlock) to share
the locks amongst UVM objects where necessary (tmpfs, layerfs, unionfs).

- Rewrite and optimise x86 TLB shootdown code, make it simpler and cleaner.
Add TLBSTATS option for x86 to collect statistics about TLB shootdowns.

- Unify /dev/mem et al in MI code and provide required locking (removes
kernel-lock on some ports). Also, avoid cache-aliasing issues.

Thanks to Andrew Doran and Joerg Sonnenberger, as their initial patches
formed the core changes of this branch.

branches: 1.98.6;
Make holding v_interlock mandatory for callers of vget().

Announced some time ago on tech-kern.

Remove vlockmgr(). Generic vnode lock operations now use a rwlock located
in the vnode. All LK_* flags move from sys/lock.h to sys/vnode.h. Calls
to vlockmgr() in file systems get replaced with VOP_LOCK() or VOP_UNLOCK().

Welcome to 5.99.34.

Discussed on tech-kern.

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.

branches: 1.95.2; 1.95.4;
ansify function definitions

Change about 4500 of the K&R function definitions to ANSI ones.
There are still about 1600 left, but they have ',' or /* ... */
in the actual variable definitions - which my awk script doesn't handle.
There are also many that need () -> (void).
(The script does handle misordered arguments.)

branches: 1.93.2;
kill MALLOC and FREE macros.

branches: 1.92.2;
PR/39324 kernel diagnostic assertion "l->l_stat != LSZOMB" failed.

Ignore procs with zero or all LSZOMB LWPs. Get a non-LSZOMB LWP to perform
operations against as part of the deal.

procfs really needs to be updated to support multi-threading fully.
Hi Antti!

branches: 1.91.2;
Remove proc_representative_lwp(), use a simple LIST_FIRST() instead.
OK by <ad>.

branches: 1.90.2; 1.90.4;
- Convert hashinit() to use kmem_alloc(). The hash tables can be large
and it's better to not have them in kmem_map.
- Convert a couple of minor items along the way to kmem_alloc().
- Fix some memory leaks.

Remove clause 3 and 4 from TNF licenses

branches: 1.88.2;
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.

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.

branches: 1.86.2;
Catch up with descriptor handling changes. See kern_descrip.c revision
1.173 for details.

branches: 1.85.6;
Replace struct lock on vnodes with a simpler lock object built on
krwlock_t. This is a step towards removing lockmgr and simplifying
vnode locking. Discussed on tech-kern.

Tons of process scope changes.

- Add a KAUTH_PROCESS_SCHEDULER action, to handle scheduler related
requests, and add specific requests for set/get scheduler policy and
set/get scheduler parameters.

- Add a KAUTH_PROCESS_KEVENT_FILTER action, to handle kevent(2) related
requests.

- Add a KAUTH_DEVICE_TTY_STI action to handle requests to TIOCSTI.

- Add requests for the KAUTH_PROCESS_CANSEE action, indicating what
process information is being looked at (entry itself, args, env,
open files).

- Add requests for the KAUTH_PROCESS_RLIMIT action indicating set/get.

- Add requests for the KAUTH_PROCESS_CORENAME action indicating set/get.

- Make bsd44 secmodel code handle the newly added rqeuests appropriately.

All of the above make it possible to issue finer-grained kauth(9) calls in
many places, removing some KAUTH_GENERIC_ISSUSER requests.

- Remove the "CAN" from KAUTH_PROCESS_CAN{KTRACE,PROCFS,PTRACE,SIGNAL}.

Discussed with christos@ and yamt@.

Merge vmlocking2 to head.

branches: 1.82.2; 1.82.6;
Merge from vmlocking:

- pool_cache changes.
- Debugger/procfs locking fixes.
- Other minor changes.

branches: 1.81.2; 1.81.4;
Merge from vmlocking:

- Split vnode::v_flag into three fields, depending on field locking.
- simple_lock -> kmutex in a few places.
- Fix some simple locking problems.