sysconf(3C)     UNIX System V(C Programming Language Utilities)     sysconf(3C)


NAME
      sysconf - get configurable system variables

SYNOPSIS
      #include <unistd.h>
      long sysconf(int name);

DESCRIPTION
      The sysconf function provides a method for the application to determine
      the current value of a configurable system limit or option (variable).

      The name argument represents the system variable to be queried.  The
      following table lists the minimal set of system variables from <limits.h>
      and <unistd.h> that can be returned by sysconf, and the symbolic
      constants, defined in <unistd.h> that are the corresponding values used
      for name.
                      ________________________________________
                     |       NAME             RETURN VALUE   |
                     |_______________________________________|
                     | _SC_ARG_MAX         ARG_MAX           |
                     | _SC_CHILD_MAX       CHILD_MAX         |
                     | _SC_CLK_TCK         CLK_TCK           |
                     | _SC_NGROUPS_MAX     NGROUPS_MAX       |
                     | _SC_OPEN_MAX        OPEN_MAX          |
                     | _SC_PASS_MAX        PASS_MAX          |
                     | _SC_PAGESIZE        PAGESIZE          |
                     | _SC_JOB_CONTROL     _POSIX_JOB_CONTROL|
                     | _SC_SAVED_IDS       _POSIX_SAVED_IDS  |
                     | _SC_VERSION         _POSIX_VERSION    |
                     | _SC_XOPEN_VERSION   _XOPEN_VERSION    |
                     | _SC_LOGNAME_MAX     LOGNAME_MAX       |
                     |_______________________________________|

      The value of CLKTCK may be variable and it should not be assumed that
      CLKTCK is a compile-time constant.  The value of CLKTCK is the same as
      the value of sysconf(SCCLKTCK).

SEE ALSO
      fpathconf(2).

DIAGNOSTICS
      If name is an invalid value, sysconf will return -1 and set errno to
      indicate the error.  If sysconf fails due to a value of name that is not
      defined on the system, the function will return a value of -1 without
      changing the value of errno.

NOTES
      A call to setrlimit may cause the value of OPENMAX to change.






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