SYSCONF(3C-SVR4)    RISC/os Reference Manual     SYSCONF(3C-SVR4)



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

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 func-
     tion will return a value of -1 without changing the value of
     errno.

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




                        Printed 11/19/92                   Page 1