source: trunk/minix/lib/other/sysconf.c@ 10

/* sysconf.c                                            POSIX 4.8.1
 *      long int sysconf(int name);
 *
 *      POSIX allows some of the values in <limits.h> to be increased at
 *      run time.  The sysconf() function allows such values to be checked
 *      at run time.  MINIX does not use this facility - the run time
 *      limits are those given in <limits.h>.
 */

#include <lib.h>
#include <unistd.h>
#include <time.h>

PUBLIC long int sysconf(name)
int name;                       /* property being inspected */
{
  switch(name) {
        case _SC_ARG_MAX:
                return (long) ARG_MAX;

        case _SC_CHILD_MAX:
                return (long) CHILD_MAX;

        case _SC_CLK_TCK:
                return (long) CLOCKS_PER_SEC;

        case _SC_NGROUPS_MAX:
                return (long) NGROUPS_MAX;

        case _SC_OPEN_MAX:
                return (long) OPEN_MAX;

        case _SC_JOB_CONTROL:
                return -1L;                     /* no job control */

        case _SC_SAVED_IDS:
                return -1L;                     /* no saved uid/gid */

        case _SC_VERSION:
                return (long) _POSIX_VERSION;

        case _SC_STREAM_MAX:
                return (long) STREAM_MAX;

        case _SC_TZNAME_MAX:
                return (long) TZNAME_MAX;

        case _SC_PAGESIZE:
                return getpagesize();

        default:
                errno = EINVAL;
                return -1L;
  }
}