Fix bug, the computation of cpuset_nentries was incorrect, we must do +1
to be able to address the last 32 bits.

On a machine with 80 CPUs, this caused "cpuctl identify >64" to return
garbage.

Avoid undefined behavior in an cpuset.c

Do not change the signedness bit with a left shift operation.
Switch to unsigned integer to prevent this.

cpuset.c:112:18, left shift of 1 by 31 places cannot be represented in type 'int'

Detected with micro-UBSan in the user mode.

branches: 1.19.2; 1.19.4;
Add bunch of missing includes of namespace.h in libc

The NetBSD Standard C Library uses internally some of its functions with
a mangled symbol name, usually "_symbol". The internal functions shall not
use the global (public) symbols.

This change eliminates usage of the global changes of the following symbols:
- strlcat -> _strlcat
- sysconf -> __sysconf
- closedir -> _closedir
- fparseln -> _fparseln
- kill -> _kill
- mkstemp -> _mkstemp
- reallocarr -> _reallocarr
- strcasecmp -> _strcasecmp
- strncasecmp -> _strncasecmp
- strptime -> _strptime
- strtok_r -> _strtok_r
- sysctl -> _sysctl
- dlopen -> __dlopen
- dlclose -> __dlclose
- dlsym -> __dlsym

Sponsored by <The NetBSD Foundation>

branches: 1.18.26;
Casts and type changes to fix portability issues.
- int -> size_t
- adjust width of RHS of shift
- adjust widths of types

branches: 1.17.2;
Add kcpuset(9) - a reworked dynamic CPU set implementation for kernel.
Suitable for use during the early boot. MD and other implementations
should be replaced with this interface.

Discussed on: tech-kern@

_cpuset_create: initialize size argument for sysctl call.
From PR/43837 by Sandy Snaman.

- Add kcpuset_iszero().
- Fix kcpuset_match().

- Add kcpuset_fill(), kcpuset_set() and kcpuset_match().
- KNF while here.

make this work with pcc. The previous construct is not valid c99.

branches: 1.12.4; 1.12.6;
Don't convert cpuid_t through int while testing it for being in range.
(Might truncate it, for one thing. Also, if the shift result is < 0 the
demons have already flown out of our nose.)

Fixes some -Wsign-compare warnings.

Add few KASSERTs.

branches: 1.10.2;
Be consistent in how cpuset_nentries is computed in the kernel and
in user-land. This fixes the user-land part. Now "cpuctl identify 0"
gives a result instead of getting EINVAL from the set-affinity syscall.

kcpuset_isset: remove if-check. It is not reasonable for kernel,
saves few cycles, and it is better for CPU cache.

Separate cpuset and kcpuset, and only use the bits in userland. Requested
by yamt

branches: 1.7.2;
We don't need any of this in standalone mode.

little more lint

make lint happy

- Add general cpuset macros.
- Use kcpuset name for kernel-only functions.
- Use cpuid_t to specify CPU ID.
- Unify all cpuset users.

API is expected to be stable now.

cpuset_create: check the return value of calloc().

- cpuset_create: pass correct argument to sysctl(3).
- Constify few variables.

cpuset related functions, shared between the kernel and userland.