minix/lib/libc/sys/wait4.c

   1 #include <sys/cdefs.h>
   2 #include <lib.h>
   3 #include "namespace.h"
   4
   5 #include <string.h>
   6 #include <sys/wait.h>
   7
   8 #ifdef __weak_alias
   9 __weak_alias(wait4, __wait450)
  10 #endif
  11
  12 pid_t
  13 wait4(pid_t pid, int * status, int options, struct rusage * rusage)
  14 {
  15         message m;
  16
  17         memset(&m, 0, sizeof(m));
  18         m.m_lc_pm_wait4.pid = pid;
  19         m.m_lc_pm_wait4.options = options;
  20         m.m_lc_pm_wait4.addr = (vir_bytes)rusage;
  21
  22         if (_syscall(PM_PROC_NR, PM_WAIT4, &m) < 0) return(-1);
  23
  24         if (status != NULL) *status = m.m_pm_lc_wait4.status;
  25         return m.m_type;
  26 }