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          sysconf(2P)      INTERACTIVE UNIX System (POSIX)      sysconf(2P)



          NAME
               sysconf - get system configuration information

          SYNOPSIS
               #include <unistd.h>
               long sysconf (name)
               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 name values are symbolic constants, defined in
               <unistd.h>, that should be used.  The variables in the table
               come from <limits.h> and <unistd.h>:

                    Configurable System Variables
                     Variable            Name Value
               {ARG_MAX}              {_SC_ARG_MAX}
               {CHILD_MAX}            {_SC_CHILD_MAX}
               {CLK_TCK}              {_SC_CLK_TCK}
               {NGROUPS_MAX}          {_SC_NGROUPS_MAX}
               {OPEN_MAX}             {_SC_OPEN_MAX}
               {_POSIX_JOB_CONTROL}   {_SC_JOB_CONTROL}
               {_POSIX_SAVED_IDS}     {_SC_SAVED_IDS}
               {_POSIX_VERSION}       {_SC_VERSION}

          DIAGNOSTICS
               If name is an invalid value, sysconf() shall return -1.  If
               the variable corresponding to name is not defined on the
               system, sysconf() will return -1 without changing the value
               of errno.

               Otherwise, the sysconf() function returns the current vari-
               able value on the system.  The value returned shall not be
               more restrictive than the corresponding value described to
               the application when it was compiled with the
               implementation's <limits.h> or <unistd.h>.  The value shall
               not change during the lifetime of the calling process.

          ERROR MESSAGES
               If any of the following conditions occur, the sysconf()
               function returns -1 and sets errno to:

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








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