lib/libc/sys-minix/priority.c

   1 /*
   2 priority.c
   3 */
   4
   5 #include <sys/cdefs.h>
   6 #include "namespace.h"
   7 #include <errno.h>
   8 #include <sys/types.h>
   9 #include <sys/resource.h>
  10 #include <lib.h>
  11 #include <unistd.h>
  12 #include <string.h>
  13 #include <stddef.h>
  14
  15
  16 int getpriority(int which, int who)
  17 {
  18         int v;
  19         message m;
  20
  21         m.m1_i1 = which;
  22         m.m1_i2 = who;
  23
  24         /* GETPRIORITY returns negative for error.
  25          * Otherwise, it returns the priority plus the minimum
  26          * priority, to distiginuish from error. We have to
  27          * correct for this. (The user program has to check errno
  28          * to see if something really went wrong.)
  29          */
  30
  31         if((v = _syscall(PM_PROC_NR, GETPRIORITY, &m)) < 0) {
  32                 return v;
  33         }
  34
  35         return v + PRIO_MIN;
  36 }
  37
  38 int setpriority(int which, int who, int prio)
  39 {
  40         message m;
  41
  42         m.m1_i1 = which;
  43         m.m1_i2 = who;
  44         m.m1_i3 = prio;
  45
  46         return _syscall(PM_PROC_NR, SETPRIORITY, &m);
  47 }
  48