Use sysctl CTL_NET.PF_INET6 to check if IPv6 is available or not.
With this sysconf(3) no longer needs the inet pledge.
The kernel has been updated for this for a while now.
OK sthen@ deraadt@

mib[2] is no longer used; ok guenther

Add hw.ncpuonline to count the number of online CPUs.

The introduction of hw.smt means that logical CPUs can be disabled
after boot and prior to suspend/resume. If hw.smt=0 (the default),
there needs to be a way to count the number of hardware threads
available on the system at any given time.

So, import HW_NCPUONLINE/hw.ncpuonline from NetBSD and document it.
hw.ncpu becomes equal to the number of CPUs given to sched_init_cpu()
during boot, while hw.ncpuonline is equal to the number of CPUs available
to the scheduler in the cpuset "sched_all_cpus". Set_SC_NPROCESSORS_ONLN
equal to this new sysctl and keep _SC_NPROCESSORS_CONF equal to hw.ncpu.

This is preferable to adding a new sysctl to count the number of
configured CPUs and keeping hw.ncpu equal to the number of online
CPUs because such a change would break software in the ecosystem
that relies on HW_NCPU/hw.ncpu to measure CPU usage and the like.
Such software in base includes top(1), systat(1), and snmpd(8),
and perhaps others.

We don't need additional locking to count the cardinality of a cpuset
in this case because the only interfaces that can modify said cardinality
are sysctl(2) and ioctl(2), both of which are under the KERNEL_LOCK.

Software using HW_NCPU/hw.ncpu to determine optimal parallism will need
to be updated to use HW_NCPUONLINE/hw.ncpuonline. Until then, such software
may perform suboptimally. However, most changes will be similar to the
change included here for libcxx's std::thread:hardware_concurrency():
using HW_NCPUONLINE in lieu of HW_NCPU should be sufficient for determining
optimal parallelism for most software if the change to _SC_NPROCESSORS_ONLN
is insufficient.

Prompted by deraadt. Discussed at length with kettenis, deraadt, and sthen.
Lots of patch tweaks from kettenis.

ok kettenis, "proceed" deraadt

shm_open(), sysconf(), tcflow(), and tcsendbreak() are not permitted to be
cancellation points in POSIX, so change them to invoke the non-cancellation
point versions of open(), close(), nanosleep(), and write()

ok deraadt@ millert@

Rearrange C runtime bits: now that ld.so exports environ and __progname,
move their definitions and initialization in static links to libc.a
Make crt0 always invoke a new func _csu_finish() in libc to process the auxv
and to either register the ld.so cleanup function (in dynamic links) or
initialize environ and __progname and do MC_DISABLE_KBIND (in static links).
In libc, get pagesize from auxv; cache that between getpagesize() and
sysconf(_SC_PAGESIZE)

ok mpi@ "good time" deraadt@

Wrap <unistd.h> so that internal calls go direct and they're all weak symbols
Delete unused 'fd' argument from internal function oldttyname()

Replace HOST_NAME_MAX+1-1 with HOST_NAME_MAX. OK deraad@

Move to the <limits.h> universe.
review by millert, binary checking process with doug, concept with guenther

decouple struct uvmexp into a new file, so that uvm_extern.h and sysctl.h
don't need to be married.
ok guenther miod beck jsing kettenis

Use VM_UVMEXP instead of VM_METER for memory usages and directly
include <sys/vmmeter.h> where it is needed instead of relying on
it being included by <uvm/uvm_extern.h>.

miod@ likes it, ok guenther@

sysconf(_SC_SEM_VALUE_MAX) should return SEM_VALUE_MAX, not some
unrelated sysv sem limit. Similarly, sysconf(_SC_SEM_NSEMS_MAX)
should return -1 instead of another sysv sem limit.

Fix _SC_CHILD_MAX, _SC_OPEN_MAX, and _SC_STREAM_MAX to correctly
handle rlim_cur set to RLIM_INFINITY or values greater than LONG_MAX,
as unlikely as those are to happen. Further limit _SC_STREAM_MAX to
at most SHRT_MAX, because struct __sFILE uses a short int for storing
the file descriptor.

While here, also remove a dead label that Clang complains about.

From FreeBSD via Brad.

In sysconf(), don't bother querying the kernel for userspace-only
values or features that POSIX now requires to always be provided.

From Brad; ok guenther and me; incorporates feedback from millert too

More sysconf(3)-y and pathconf(3)-y goodness from Brad.
ok guenther, millert (and me); bulk build test by naddy

Add the _POSIX_MONOTONIC_CLOCK symbol and the sysconf(3)
_SC_MONOTONIC_CLOCK variable.
from Brad

No libc minor crank needed, as no API has been changed, per se (deraadt).

ports bulk testing by landry@
small man rewording from thib@
ok millert@ otto@ deraadt@

Teach sysconf(_SC_GETGR_R_SIZE_MAX) the correct size of a buffer for the
reentrant getgrent functions (getgrgid_r, getgrnam_r).

seems reasonable to millert@, ok deraadt@

support _SC_HOST_NAME_MAX; from brad
a libc crank is happening in < 24 hours

Add support to sysconf(3) for the variables _SC_NPROCESSORS_CONF and
_SC_NPROCESSORS_ONLN, implemented by AIX/Tru64/Solaris/Linux/SCO/FreeBSD/NetBSD.
Bump libc minor.

From Brad, ok deraadt@ guenther@

Implement _SC_GETGR_R_SIZE_MAX, _SC_GETPW_R_SIZE_MAX, _SC_LOGIN_NAME_MAX,
and _SC_THREAD_SAFE_FUNCTIONS for sysconf(3). OK deraadt@

Add the semi-standard _SC_PHYS_PAGES and _SC_AVPHYS_PAGES, sysconf(3) variable.

ok espie@

zap remaining rcsid.

Kill old files that are no longer compiled.

okay theo

ansify function definitions and zap some `register'

ok millert@

Implement _SC_SEM_NSEMS_MAX and _SC_SEM_VALUE_MAX.
Based on a diff from Jean-G�rard Pailloncy.

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

add sysctl and sysconf support for sysvsem, sysvshm, sysvmsg, and fsync; mostly from kleink

Remove dead code
Remove unused variables
Silence some warnings
lint(1) is your friend

Fix RCS ids
Make sure everything uses {SYS,}LIBC_SCCS properly

branches: 1.1.1;
Initial revision

mib[2] is no longer used; ok guenther

Add hw.ncpuonline to count the number of online CPUs.

The introduction of hw.smt means that logical CPUs can be disabled
after boot and prior to suspend/resume. If hw.smt=0 (the default),
there needs to be a way to count the number of hardware threads
available on the system at any given time.

So, import HW_NCPUONLINE/hw.ncpuonline from NetBSD and document it.
hw.ncpu becomes equal to the number of CPUs given to sched_init_cpu()
during boot, while hw.ncpuonline is equal to the number of CPUs available
to the scheduler in the cpuset "sched_all_cpus". Set_SC_NPROCESSORS_ONLN
equal to this new sysctl and keep _SC_NPROCESSORS_CONF equal to hw.ncpu.

This is preferable to adding a new sysctl to count the number of
configured CPUs and keeping hw.ncpu equal to the number of online
CPUs because such a change would break software in the ecosystem
that relies on HW_NCPU/hw.ncpu to measure CPU usage and the like.
Such software in base includes top(1), systat(1), and snmpd(8),
and perhaps others.

We don't need additional locking to count the cardinality of a cpuset
in this case because the only interfaces that can modify said cardinality
are sysctl(2) and ioctl(2), both of which are under the KERNEL_LOCK.

Software using HW_NCPU/hw.ncpu to determine optimal parallism will need
to be updated to use HW_NCPUONLINE/hw.ncpuonline. Until then, such software
may perform suboptimally. However, most changes will be similar to the
change included here for libcxx's std::thread:hardware_concurrency():
using HW_NCPUONLINE in lieu of HW_NCPU should be sufficient for determining
optimal parallelism for most software if the change to _SC_NPROCESSORS_ONLN
is insufficient.

Prompted by deraadt. Discussed at length with kettenis, deraadt, and sthen.
Lots of patch tweaks from kettenis.

ok kettenis, "proceed" deraadt

shm_open(), sysconf(), tcflow(), and tcsendbreak() are not permitted to be
cancellation points in POSIX, so change them to invoke the non-cancellation
point versions of open(), close(), nanosleep(), and write()

ok deraadt@ millert@

Rearrange C runtime bits: now that ld.so exports environ and __progname,
move their definitions and initialization in static links to libc.a
Make crt0 always invoke a new func _csu_finish() in libc to process the auxv
and to either register the ld.so cleanup function (in dynamic links) or
initialize environ and __progname and do MC_DISABLE_KBIND (in static links).
In libc, get pagesize from auxv; cache that between getpagesize() and
sysconf(_SC_PAGESIZE)

ok mpi@ "good time" deraadt@

Wrap <unistd.h> so that internal calls go direct and they're all weak symbols
Delete unused 'fd' argument from internal function oldttyname()

Replace HOST_NAME_MAX+1-1 with HOST_NAME_MAX. OK deraad@

Move to the <limits.h> universe.
review by millert, binary checking process with doug, concept with guenther

decouple struct uvmexp into a new file, so that uvm_extern.h and sysctl.h
don't need to be married.
ok guenther miod beck jsing kettenis

Use VM_UVMEXP instead of VM_METER for memory usages and directly
include <sys/vmmeter.h> where it is needed instead of relying on
it being included by <uvm/uvm_extern.h>.

miod@ likes it, ok guenther@

sysconf(_SC_SEM_VALUE_MAX) should return SEM_VALUE_MAX, not some
unrelated sysv sem limit. Similarly, sysconf(_SC_SEM_NSEMS_MAX)
should return -1 instead of another sysv sem limit.

Fix _SC_CHILD_MAX, _SC_OPEN_MAX, and _SC_STREAM_MAX to correctly
handle rlim_cur set to RLIM_INFINITY or values greater than LONG_MAX,
as unlikely as those are to happen. Further limit _SC_STREAM_MAX to
at most SHRT_MAX, because struct __sFILE uses a short int for storing
the file descriptor.

While here, also remove a dead label that Clang complains about.

From FreeBSD via Brad.

In sysconf(), don't bother querying the kernel for userspace-only
values or features that POSIX now requires to always be provided.

From Brad; ok guenther and me; incorporates feedback from millert too

More sysconf(3)-y and pathconf(3)-y goodness from Brad.
ok guenther, millert (and me); bulk build test by naddy

Add the _POSIX_MONOTONIC_CLOCK symbol and the sysconf(3)
_SC_MONOTONIC_CLOCK variable.
from Brad

No libc minor crank needed, as no API has been changed, per se (deraadt).

ports bulk testing by landry@
small man rewording from thib@
ok millert@ otto@ deraadt@

Teach sysconf(_SC_GETGR_R_SIZE_MAX) the correct size of a buffer for the
reentrant getgrent functions (getgrgid_r, getgrnam_r).

seems reasonable to millert@, ok deraadt@

support _SC_HOST_NAME_MAX; from brad
a libc crank is happening in < 24 hours

Add support to sysconf(3) for the variables _SC_NPROCESSORS_CONF and
_SC_NPROCESSORS_ONLN, implemented by AIX/Tru64/Solaris/Linux/SCO/FreeBSD/NetBSD.
Bump libc minor.

From Brad, ok deraadt@ guenther@

Implement _SC_GETGR_R_SIZE_MAX, _SC_GETPW_R_SIZE_MAX, _SC_LOGIN_NAME_MAX,
and _SC_THREAD_SAFE_FUNCTIONS for sysconf(3). OK deraadt@

Add the semi-standard _SC_PHYS_PAGES and _SC_AVPHYS_PAGES, sysconf(3) variable.

ok espie@

zap remaining rcsid.

Kill old files that are no longer compiled.

okay theo

ansify function definitions and zap some `register'

ok millert@

Implement _SC_SEM_NSEMS_MAX and _SC_SEM_VALUE_MAX.
Based on a diff from Jean-G�rard Pailloncy.

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

add sysctl and sysconf support for sysvsem, sysvshm, sysvmsg, and fsync; mostly from kleink

Remove dead code
Remove unused variables
Silence some warnings
lint(1) is your friend

Fix RCS ids
Make sure everything uses {SYS,}LIBC_SCCS properly

branches: 1.1.1;
Initial revision

Add hw.ncpuonline to count the number of online CPUs.

The introduction of hw.smt means that logical CPUs can be disabled
after boot and prior to suspend/resume. If hw.smt=0 (the default),
there needs to be a way to count the number of hardware threads
available on the system at any given time.

So, import HW_NCPUONLINE/hw.ncpuonline from NetBSD and document it.
hw.ncpu becomes equal to the number of CPUs given to sched_init_cpu()
during boot, while hw.ncpuonline is equal to the number of CPUs available
to the scheduler in the cpuset "sched_all_cpus". Set_SC_NPROCESSORS_ONLN
equal to this new sysctl and keep _SC_NPROCESSORS_CONF equal to hw.ncpu.

This is preferable to adding a new sysctl to count the number of
configured CPUs and keeping hw.ncpu equal to the number of online
CPUs because such a change would break software in the ecosystem
that relies on HW_NCPU/hw.ncpu to measure CPU usage and the like.
Such software in base includes top(1), systat(1), and snmpd(8),
and perhaps others.

We don't need additional locking to count the cardinality of a cpuset
in this case because the only interfaces that can modify said cardinality
are sysctl(2) and ioctl(2), both of which are under the KERNEL_LOCK.

Software using HW_NCPU/hw.ncpu to determine optimal parallism will need
to be updated to use HW_NCPUONLINE/hw.ncpuonline. Until then, such software
may perform suboptimally. However, most changes will be similar to the
change included here for libcxx's std::thread:hardware_concurrency():
using HW_NCPUONLINE in lieu of HW_NCPU should be sufficient for determining
optimal parallelism for most software if the change to _SC_NPROCESSORS_ONLN
is insufficient.

Prompted by deraadt. Discussed at length with kettenis, deraadt, and sthen.
Lots of patch tweaks from kettenis.

ok kettenis, "proceed" deraadt

shm_open(), sysconf(), tcflow(), and tcsendbreak() are not permitted to be
cancellation points in POSIX, so change them to invoke the non-cancellation
point versions of open(), close(), nanosleep(), and write()

ok deraadt@ millert@

Rearrange C runtime bits: now that ld.so exports environ and __progname,
move their definitions and initialization in static links to libc.a
Make crt0 always invoke a new func _csu_finish() in libc to process the auxv
and to either register the ld.so cleanup function (in dynamic links) or
initialize environ and __progname and do MC_DISABLE_KBIND (in static links).
In libc, get pagesize from auxv; cache that between getpagesize() and
sysconf(_SC_PAGESIZE)

ok mpi@ "good time" deraadt@

Wrap <unistd.h> so that internal calls go direct and they're all weak symbols
Delete unused 'fd' argument from internal function oldttyname()

Replace HOST_NAME_MAX+1-1 with HOST_NAME_MAX. OK deraad@

Move to the <limits.h> universe.
review by millert, binary checking process with doug, concept with guenther

decouple struct uvmexp into a new file, so that uvm_extern.h and sysctl.h
don't need to be married.
ok guenther miod beck jsing kettenis

Use VM_UVMEXP instead of VM_METER for memory usages and directly
include <sys/vmmeter.h> where it is needed instead of relying on
it being included by <uvm/uvm_extern.h>.

miod@ likes it, ok guenther@

sysconf(_SC_SEM_VALUE_MAX) should return SEM_VALUE_MAX, not some
unrelated sysv sem limit. Similarly, sysconf(_SC_SEM_NSEMS_MAX)
should return -1 instead of another sysv sem limit.

Fix _SC_CHILD_MAX, _SC_OPEN_MAX, and _SC_STREAM_MAX to correctly
handle rlim_cur set to RLIM_INFINITY or values greater than LONG_MAX,
as unlikely as those are to happen. Further limit _SC_STREAM_MAX to
at most SHRT_MAX, because struct __sFILE uses a short int for storing
the file descriptor.

While here, also remove a dead label that Clang complains about.

From FreeBSD via Brad.

In sysconf(), don't bother querying the kernel for userspace-only
values or features that POSIX now requires to always be provided.

From Brad; ok guenther and me; incorporates feedback from millert too

More sysconf(3)-y and pathconf(3)-y goodness from Brad.
ok guenther, millert (and me); bulk build test by naddy

Add the _POSIX_MONOTONIC_CLOCK symbol and the sysconf(3)
_SC_MONOTONIC_CLOCK variable.
from Brad

No libc minor crank needed, as no API has been changed, per se (deraadt).

ports bulk testing by landry@
small man rewording from thib@
ok millert@ otto@ deraadt@

Teach sysconf(_SC_GETGR_R_SIZE_MAX) the correct size of a buffer for the
reentrant getgrent functions (getgrgid_r, getgrnam_r).

seems reasonable to millert@, ok deraadt@

support _SC_HOST_NAME_MAX; from brad
a libc crank is happening in < 24 hours

Add support to sysconf(3) for the variables _SC_NPROCESSORS_CONF and
_SC_NPROCESSORS_ONLN, implemented by AIX/Tru64/Solaris/Linux/SCO/FreeBSD/NetBSD.
Bump libc minor.

From Brad, ok deraadt@ guenther@

Implement _SC_GETGR_R_SIZE_MAX, _SC_GETPW_R_SIZE_MAX, _SC_LOGIN_NAME_MAX,
and _SC_THREAD_SAFE_FUNCTIONS for sysconf(3). OK deraadt@

Add the semi-standard _SC_PHYS_PAGES and _SC_AVPHYS_PAGES, sysconf(3) variable.

ok espie@

zap remaining rcsid.

Kill old files that are no longer compiled.

okay theo

ansify function definitions and zap some `register'

ok millert@

Implement _SC_SEM_NSEMS_MAX and _SC_SEM_VALUE_MAX.
Based on a diff from Jean-G�rard Pailloncy.

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

add sysctl and sysconf support for sysvsem, sysvshm, sysvmsg, and fsync; mostly from kleink

Remove dead code
Remove unused variables
Silence some warnings
lint(1) is your friend

Fix RCS ids
Make sure everything uses {SYS,}LIBC_SCCS properly

branches: 1.1.1;
Initial revision

shm_open(), sysconf(), tcflow(), and tcsendbreak() are not permitted to be
cancellation points in POSIX, so change them to invoke the non-cancellation
point versions of open(), close(), nanosleep(), and write()

ok deraadt@ millert@

Rearrange C runtime bits: now that ld.so exports environ and __progname,
move their definitions and initialization in static links to libc.a
Make crt0 always invoke a new func _csu_finish() in libc to process the auxv
and to either register the ld.so cleanup function (in dynamic links) or
initialize environ and __progname and do MC_DISABLE_KBIND (in static links).
In libc, get pagesize from auxv; cache that between getpagesize() and
sysconf(_SC_PAGESIZE)

ok mpi@ "good time" deraadt@

Wrap <unistd.h> so that internal calls go direct and they're all weak symbols
Delete unused 'fd' argument from internal function oldttyname()

Replace HOST_NAME_MAX+1-1 with HOST_NAME_MAX. OK deraad@

Move to the <limits.h> universe.
review by millert, binary checking process with doug, concept with guenther

decouple struct uvmexp into a new file, so that uvm_extern.h and sysctl.h
don't need to be married.
ok guenther miod beck jsing kettenis

Use VM_UVMEXP instead of VM_METER for memory usages and directly
include <sys/vmmeter.h> where it is needed instead of relying on
it being included by <uvm/uvm_extern.h>.

miod@ likes it, ok guenther@

sysconf(_SC_SEM_VALUE_MAX) should return SEM_VALUE_MAX, not some
unrelated sysv sem limit. Similarly, sysconf(_SC_SEM_NSEMS_MAX)
should return -1 instead of another sysv sem limit.

Fix _SC_CHILD_MAX, _SC_OPEN_MAX, and _SC_STREAM_MAX to correctly
handle rlim_cur set to RLIM_INFINITY or values greater than LONG_MAX,
as unlikely as those are to happen. Further limit _SC_STREAM_MAX to
at most SHRT_MAX, because struct __sFILE uses a short int for storing
the file descriptor.

While here, also remove a dead label that Clang complains about.

From FreeBSD via Brad.

In sysconf(), don't bother querying the kernel for userspace-only
values or features that POSIX now requires to always be provided.

From Brad; ok guenther and me; incorporates feedback from millert too

More sysconf(3)-y and pathconf(3)-y goodness from Brad.
ok guenther, millert (and me); bulk build test by naddy

Add the _POSIX_MONOTONIC_CLOCK symbol and the sysconf(3)
_SC_MONOTONIC_CLOCK variable.
from Brad

No libc minor crank needed, as no API has been changed, per se (deraadt).

ports bulk testing by landry@
small man rewording from thib@
ok millert@ otto@ deraadt@

Teach sysconf(_SC_GETGR_R_SIZE_MAX) the correct size of a buffer for the
reentrant getgrent functions (getgrgid_r, getgrnam_r).

seems reasonable to millert@, ok deraadt@

support _SC_HOST_NAME_MAX; from brad
a libc crank is happening in < 24 hours

Add support to sysconf(3) for the variables _SC_NPROCESSORS_CONF and
_SC_NPROCESSORS_ONLN, implemented by AIX/Tru64/Solaris/Linux/SCO/FreeBSD/NetBSD.
Bump libc minor.

From Brad, ok deraadt@ guenther@

Implement _SC_GETGR_R_SIZE_MAX, _SC_GETPW_R_SIZE_MAX, _SC_LOGIN_NAME_MAX,
and _SC_THREAD_SAFE_FUNCTIONS for sysconf(3). OK deraadt@

Add the semi-standard _SC_PHYS_PAGES and _SC_AVPHYS_PAGES, sysconf(3) variable.

ok espie@

zap remaining rcsid.

Kill old files that are no longer compiled.

okay theo

ansify function definitions and zap some `register'

ok millert@

Implement _SC_SEM_NSEMS_MAX and _SC_SEM_VALUE_MAX.
Based on a diff from Jean-G�rard Pailloncy.

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

add sysctl and sysconf support for sysvsem, sysvshm, sysvmsg, and fsync; mostly from kleink

Remove dead code
Remove unused variables
Silence some warnings
lint(1) is your friend

Fix RCS ids
Make sure everything uses {SYS,}LIBC_SCCS properly

branches: 1.1.1;
Initial revision