lib/other/sysconf.c

   1 /* sysconf.c                                            POSIX 4.8.1
   2  *      long int sysconf(int name);
   3  *
   4  *      POSIX allows some of the values in <limits.h> to be increased at
   5  *      run time.  The sysconf() function allows such values to be checked
   6  *      at run time.  MINIX does not use this facility - the run time
   7  *      limits are those given in <limits.h>.
   8  */
   9
  10 #include <lib.h>
  11 #include <unistd.h>
  12 #include <time.h>
  13
  14 PUBLIC long int sysconf(name)
  15 int name;                       /* property being inspected */
  16 {
  17   switch(name) {
  18         case _SC_ARG_MAX:
  19                 return (long) ARG_MAX;
  20
  21         case _SC_CHILD_MAX:
  22                 return (long) CHILD_MAX;
  23
  24         case _SC_CLK_TCK:
  25                 return (long) CLOCKS_PER_SEC;
  26
  27         case _SC_NGROUPS_MAX:
  28                 return (long) NGROUPS_MAX;
  29
  30         case _SC_OPEN_MAX:
  31                 return (long) OPEN_MAX;
  32
  33         case _SC_JOB_CONTROL:
  34                 return -1L;                     /* no job control */
  35
  36         case _SC_SAVED_IDS:
  37                 return -1L;                     /* no saved uid/gid */
  38
  39         case _SC_VERSION:
  40                 return (long) _POSIX_VERSION;
  41
  42         case _SC_STREAM_MAX:
  43                 return (long) STREAM_MAX;
  44
  45         case _SC_TZNAME_MAX:
  46                 return (long) TZNAME_MAX;
  47
  48         case _SC_PAGESIZE:
  49                 return getpagesize();
  50
  51         default:
  52                 errno = EINVAL;
  53                 return -1L;
  54   }
  55 }