sysconf man page on 4.4BSD

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SYSCONF(3)		 BSD Library Functions Manual		    SYSCONF(3)

NAME
     sysconf — get configurable system variables

SYNOPSIS
     #include <unistd.h>

     long
     sysconf(int name);

DESCRIPTION
     This interface is defined by IEEE Std 1003.1-1988 (“POSIX.1”).  A far
     more complete interface is available using sysctl(3).

     The sysconf() function provides a method for applications to determine
     the current value of a configurable system limit or option variable.  The
     name argument specifies the system variable to be queried.	 Symbolic con‐
     stants for each name value are found in the include file <unistd.h>.

     The available values are as follows:

     _SC_ARG_MAX
	     The maximum bytes of argument to exec(2).

     _SC_CHILD_MAX
	     The maximum number of simultaneous processes per user id.

     _SC_CLK_TCK
	     Number of micro-seconds per hz tick.

     _SC_NGROUPS_MAX
	     The maximum number of supplemental groups.

     _SC_OPEN_MAX
	     The maximum number of open files per user id.

     _SC_STREAM_MAX
	     The minimum maximum number of streams that a process may have
	     open at any one time.

     _SC_TZNAME_MAX
	     The minimum maximum number of types supported for the name of a
	     timezone.

     _SC_JOB_CONTROL
	     Return 1 if job control is available on this system, otherwise
	     -1.

     _SC_SAVED_IDS
	     Returns 1 if saved set-group and saved set-user ID is available,
	     otherwise -1.

     _SC_VERSION
	     The version of ISO/IEC 9945 (POSIX 1003.1) with which the system
	     attempts to comply.

     _SC_BC_BASE_MAX
	     The maximum ibase/obase values in the bc(1) utility.

     _SC_BC_DIM_MAX
	     The maximum array size in the bc(1) utility.

     _SC_BC_SCALE_MAX
	     The maximum scale value in the bc(1) utility.

     _SC_BC_STRING_MAX
	     The maximum string length in the bc(1) utility.

     _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.

     _SC_EXPR_NEST_MAX
	     The maximum number of expressions that can be nested within
	     parenthesis by the expr(1) utility.

     _SC_LINE_MAX
	     The maximum length in bytes of a text-processing utility's input
	     line.

     _SC_RE_DUP_MAX
	     The maximum number of repeated occurrences of a regular expres‐
	     sion permitted when using interval notation.

     _SC_2_VERSION
	     The version of POSIX 1003.2 with which the system attempts to
	     comply.

     _SC_2_C_BIND
	     Return 1 if the system's C-language development facilities sup‐
	     port the C-Language Bindings Option, otherwise -1.

     _SC_2_C_DEV
	     Return 1 if the system supports the C-Language Development Utili‐
	     ties Option, otherwise -1.

     _SC_2_CHAR_TERM
	     Return 1 if the system supports at least one terminal type capa‐
	     ble of all operations described in POSIX 1003.2, otherwise -1.

     _SC_2_FORT_DEV
	     Return 1 if the system supports the FORTRAN Development Utilities
	     Option, otherwise -1.

     _SC_2_FORT_RUN
	     Return 1 if the system supports the FORTRAN Runtime Utilities
	     Option, otherwise -1.

     _SC_2_LOCALEDEF
	     Return 1 if the system supports the creation of locales, other‐
	     wise -1.

     _SC_2_SW_DEV
	     Return 1 if the system supports the Software Development Utili‐
	     ties Option, otherwise -1.

     _SC_2_UPE
	     Return 1 if the system supports the User Portability Utilities
	     Option, otherwise -1.

RETURN VALUES
     If the call to sysconf is not successful, -1 is returned and errno is set
     appropriately.  Otherwise, if the variable is associated with functional‐
     ity that is not supported, -1 is returned and errno is not modified.
     Otherwise, the current variable value is returned.

ERRORS
     The sysconf() function may fail and set errno for any of the errors spec‐
     ified for the library functions sysctl(3).	 In addition, the following
     error may be reported:

     [EINVAL]		The value of the name argument is invalid.

SEE ALSO
     sysctl(3)

BUGS
     The value for _SC_STREAM_MAX is a minimum maximum, and required to be the
     same as ANSI C's FOPEN_MAX, so the returned value is a ridiculously small
     and misleading number.

STANDARDS
     The sysconf() function conforms to IEEE Std 1003.1-1988 (“POSIX.1”).

HISTORY
     The sysconf function first appeared in 4.4BSD.

4th Berkeley Distribution	April 19, 1994	     4th Berkeley Distribution
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