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Document some more sysconf(3) variables.

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Rebecca Cran 2011-02-13 17:43:56 +00:00
parent 1325ba9d01
commit dcdb209924
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59
lib/libc/gen/sysconf.3
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@ -28,7 +28,7 @@
.\" @(#)sysconf.3 8.3 (Berkeley) 4/19/94
.\" $FreeBSD$
.\"
.Dd December 14, 2006
.Dd February 13, 2011
.Dt SYSCONF 3
.Os
.Sh NAME
@ -85,6 +85,9 @@ The number of processors currently online.
The maximum number of open files per user id.
.It Li _SC_PAGESIZE
The size of a system page in bytes.
.It Li _SC_PAGE_SIZE
Equivalent to
.Li _SC_PAGESIZE .
.It Li _SC_STREAM_MAX
The minimum maximum number of streams that a process may have open
at any one time.
@ -160,10 +163,64 @@ otherwise \-1.
.It Li _SC_2_UPE
Return 1 if the system supports the User Portability Utilities Option,
otherwise \-1.
.It Li _SC_AIO_LISTIO_MAX
Maximum number of I/O operations in a single list I/O call supported.
.It Li _SC_AIO_MAX
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_DELAYTIMER_MAX
Maximum number of timer expiration overruns.
.It Li _SC_MQ_OPEN_MAX
The maximum number of open message queue descriptors a process may hold.
.It Li _SC_RTSIG_MAX
Maximum number of realtime signals reserved for application use.
.It Li _SC_SEM_NSEMS_MAX
Maximum number of semaphores that a process may have.
.It Li _SC_SEM_VALUE_MAX
The maximum value a semaphore may have.
.It Li _SC_SIGQUEUE_MAX
Maximum number of queued signals that a process may send and have pending at
the receiver(s) at any time.
.It Li _SC_TIMER_MAX
Maximum number of timers per process supported.
.It Li _SC_GETGR_R_SIZE_MAX
Suggested initial value for the size of the group entry buffer.
.It Li _SC_GETPW_R_SIZE_MAX
Suggested initial value for the size of the password entry buffer.
.It Li _SC_HOST_NAME_MAX
Maximum length of a host name (not including the terminating null) as
returned from the
.Fn gethostname
function.
.It Li _SC_LOGIN_NAME_MAX
Maximum length of a login name.
.It Li _SC_THREAD_STACK_MIN
Minimum size in bytes of thread stack storage.
.It Li _SC_THREAD_THREADS_MAX
Maximum number of threads that can be created per process.
.It Li _SC_TTY_NAME_MAX
Maximum length of terminal device name.
.It Li _SC_SYMLOOP_MAX
Maximum number of symbolic links that can be reliably traversed in the
resolution of a pathname in the absence of a loop.
.It Li _SC_ATEXIT_MAX
Maximum number of functions that may be registered with
.Fn atexit .
.It Li _SC_XOPEN_VERSION
An integer value greater than or equal to 4,
indicating the version of the X/Open Portability Guide to which this
system conforms.
.It Li _SC_XOPEN_XCU_VERSION
An integer value indicating the version of the XCU Specification to which
this system conforms.
.El
.Pp
These values also exist, but may not be standard:
.Bl -tag -width 6n
.It Li _SC_CPUSET_SIZE
Size of the kernel cpuset.
.It Li _SC_PHYS_PAGES
The number of pages of physical memory.
Note that it is possible that the product of this value and the value of