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Document many of the missing posix.1b options.

Browse Source 
PR:		20528
Submitted by:	bms (original version)
Requested by:	mike (awhile ago)
This commit is contained in:
Tom Rhodes 2003-12-23 17:29:35 +00:00
parent 84394e7fa9
commit a0137e7055
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=123773
1 changed files with 138 additions and 72 deletions
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210
lib/libc/gen/sysconf.3
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@ -67,78 +67,6 @@ The available values are as follows:
.Pp
.Bl -tag -width 6n
.Pp
.It Li _SC_ARG_MAX
The maximum bytes of argument to
.Xr execve 2 .
.It Li _SC_CHILD_MAX
The maximum number of simultaneous processes per user id.
.It Li _SC_CLK_TCK
The frequency of the statistics clock in ticks per second.
.It Li _SC_IOV_MAX
The maximum number of elements in the I/O vector used by
.Xr readv 2 ,
.Xr writev 2 ,
.Xr recvmsg 2 ,
and
.Xr sendmsg 2 .
.It Li _SC_NGROUPS_MAX
The maximum number of supplemental groups.
.It Li _SC_NPROCESSORS_CONF
The number of processors configured.
.It Li _SC_NPROCESSORS_ONLN
The number of processors currently online.
.It Li _SC_OPEN_MAX
The maximum number of open files per user id.
.It Li _SC_STREAM_MAX
The minimum maximum number of streams that a process may have open
at any one time.
.It Li _SC_TZNAME_MAX
The minimum maximum number of types supported for the name of a
timezone.
.It Li _SC_JOB_CONTROL
Return 1 if job control is available on this system, otherwise \-1.
.It Li _SC_SAVED_IDS
Returns 1 if saved set-group and saved set-user ID is available,
otherwise \-1.
.It Li _SC_VERSION
The version of
.St -p1003.1
with which the system
attempts to comply.
.It Li _SC_BC_BASE_MAX
The maximum ibase/obase values in the
.Xr bc 1
utility.
.It Li _SC_BC_DIM_MAX
The maximum array size in the
.Xr bc 1
utility.
.It Li _SC_BC_SCALE_MAX
The maximum scale value in the
.Xr bc 1
utility.
.It Li _SC_BC_STRING_MAX
The maximum string length in the
.Xr bc 1
utility.
.It Li _SC_COLL_WEIGHTS_MAX
The maximum number of weights that can be assigned to any entry of
the LC_COLLATE order keyword in the locale definition file.
.It Li _SC_EXPR_NEST_MAX
The maximum number of expressions that can be nested within
parenthesis by the
.Xr expr 1
utility.
.It Li _SC_LINE_MAX
The maximum length in bytes of a text-processing utility's input
line.
.It Li _SC_RE_DUP_MAX
The maximum number of repeated occurrences of a regular expression
permitted when using interval notation.
.It Li _SC_2_VERSION
The version of
.St -p1003.2
with which the system attempts to comply.
.It Li _SC_2_C_BIND
Return 1 if the system's C-language development facilities support the
C-Language Bindings Option, otherwise \-1.
@ -164,6 +92,144 @@ otherwise \-1.
.It Li _SC_2_UPE
Return 1 if the system supports the User Portability Utilities Option,
otherwise \-1.
.It Li _SC_2_VERSION
The version of
.St -p1003.2
with which the system attempts to comply.
.It Li _SC_AIO_LISTIO_MAX
The maximum number of POSIX asynchronous I/O operations supported.
.It Li _SC_AIO_MAX
The maximum number of outstanding asynchronous I/O operations supported.
.It Li _SC_AIO_PRIO_DELTA_MAX
The maximum amount by which a process can decrease its asynchronous
I/O priority level from its own scheduling priority.
.It Li _SC_ARG_MAX
The maximum bytes of argument to
.Xr execve 2 .
.It Li _SC_ASYNCHRONOUS_IO
Return 1 if the system supports Asynchronous I/O facilities as described in
.St -p1003.1 ,
otherwise \-1.
.It Li _SC_ATEXIT_MAX
The maximum number of functions that a process may register with the
.Fn atexit
function.
.It Li _SC_BC_BASE_MAX
The maximum ibase/obase values in the
.Xr bc 1
utility.
.It Li _SC_BC_DIM_MAX
The maximum array size in the
.Xr bc 1
utility.
.It Li _SC_BC_SCALE_MAX
The maximum scale value in the
.Xr bc 1
utility.
.It Li _SC_BC_STRING_MAX
The maximum string length in the
.Xr bc 1
utility.
.It Li _SC_CHILD_MAX
The maximum number of simultaneous processes per user id.
.It Li _SC_CLK_TCK
The frequency of the statistics clock in ticks per second.
.It Li _SC_COLL_WEIGHTS_MAX
The maximum number of weights that can be assigned to any entry of
the LC_COLLATE order keyword in the locale definition file.
.It Li _SC_DELAYTIMER_MAX
The maximum number of timer expiration overruns permitted for each process.
.It Li _SC_EXPR_NEST_MAX
The maximum number of expressions that can be nested within
parenthesis by the
.Xr expr 1
utility.
.It Li _SC_FSYNC
Return 1 if the system supports file synchronization, otherwise \-1.
.It Li _SC_IOV_MAX
The maximum number of iovec structures that one process may use with the
.Fn readv
and
.Fn writev
functions.
.It Li _SC_IPV6
Return 1 if the system supports Internet Protocol version 6, otherwise \-1.
.It Li _SC_JOB_CONTROL
Return 1 if job control is available on this system, otherwise \-1.
.It Li _SC_LINE_MAX
The maximum length in bytes of a text-processing utility's input
line.
.It Li _SC_MAPPED_FILES
Return 1 if the system supports memory mapped files, otherwise \-1.
.It Li _SC_MEMLOCK
Return 1 if the system supports process memory locking, otherwise \-1.
.It Li _SC_MEMLOCK_RANGE
Return 1 if the system supports range memory locking, otherwise \-1.
.It Li _SC_MEMORY_PROTECTION
Return 1 if the system supports memory protection, otherwise \-1.
.It Li _SC_MESSAGE_PASSING
Return 1 if the system supports POSIX message queues, otherwise \-1.
.It Li _SC_MQ_OPEN_MAX
The maximum number of open POSIX message queues which a process may hold.
.It Li _SC_NGROUPS_MAX
The maximum number of supplemental groups.
.It Li _SC_NPROCESSORS_CONF
The number of processors configured.
.It Li _SC_NPROCESSORS_ONLN
The number of processors currently online.
.It Li _SC_OPEN_MAX
The maximum number of open files per user id.
.It Li _SC_PAGE_SIZE
This is a synonym for
.Dv _SC_PAGESIZE .
.It Li _SC_PAGESIZE
The system memory page size.
.It Li _SC_PRIORITIZED_IO
Return 1 if the system supports POSIX prioritized I/O, otherwise \-1.
.It Li _SC_PRIORITY_SCHEDULING
Return 1 if the system supports POSIX priority scheduling, otherwise \-1.
.It Li _SC_RAW_SOCKETS
Return 1 if the system supports
.Dv SOCK_RAW
style raw sockets, otherwise \-1.
.It Li _SC_RE_DUP_MAX
The maximum number of repeated occurrences of a regular expression
permitted when using interval notation.
.It Li _SC_REALTIME_SIGNALS
Return 1 if the system supports POSIX realtime signals, otherwise \-1.
.It Li _SC_RTSIG_MAX
The number of the highest POSIX realtime signal supported.
.It Li _SC_SAVED_IDS
Returns 1 if saved set-group and saved set-user ID is available,
otherwise \-1.
.It Li _SC_SEM_NSEMS_MAX
The maximum number of POSIX semaphores that a process may have.
.It Li _SC_SEM_VALUE_MAX
The maximum value that a POSIX semaphore may have.
.It Li _SC_SEMAPHORES
Return 1 if the system supports POSIX semaphores, otherwise \-1.
.It Li _SC_SHARED_MEMORY_OBJECTS
Return 1 if the system supports POSIX shared memory objects, otherwise \-1.
.It Li _SC_SIGQUEUE_MAX
The maximum number of POSIX queued signals that a process may send and
have pending at receiver(s) at any given time.
.It Li _SC_STREAM_MAX
The minimum maximum number of streams that a process may have open
at any one time.
.It Li _SC_SYNCHRONIZED_IO
Return 1 if the system supports POSIX synchronized I/O, otherwise \-1.
.It Li _SC_TIMER_MAX
The maximum number of POSIX timers that a process may request.
.It Li _SC_TIMERS
Return 1 if the system supports POSIX timers, otherwise \-1.
.It Li _SC_TZNAME_MAX
The minimum maximum number of types supported for the name of a
timezone.
.It Li _SC_VERSION
The version of
.St -p1003.1
with which the system
attempts to comply.
.El
.Sh RETURN VALUES
If the call to