sysconf(3C)         (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   |
                      |_______________________________________|
                      | SCARGMAX         ARGMAX           |
                      | SCCHILDMAX       CHILDMAX         |
                      | SCCLKTCK         CLKTCK           |
                      | SCNGROUPSMAX     NGROUPSMAX       |
                      | SCOPENMAX        OPENMAX          |
                      | SCPASSMAX        PASSMAX          |
                      | SCPAGESIZE        PAGESIZE          |
                      | SCJOBCONTROL     POSIXJOBCONTROL|
                      | SCSAVEDIDS       POSIXSAVEDIDS  |
                      | SCVERSION         POSIXVERSION    |
                      | SCXOPENVERSION   XOPENVERSION    |
                      | SCLOGNAMEMAX     LOGNAMEMAX       |
                      |_______________________________________|

         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(3C).

   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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