minix/lib/libc/sys/getppid.c

   1 #include <sys/cdefs.h>
   2 #include "namespace.h"
   3 #include <lib.h>
   4
   5 #include <string.h>
   6 #include <unistd.h>
   7
   8 pid_t getppid(void)
   9 {
  10   message m;
  11
  12   memset(&m, 0, sizeof(m));
  13   /* POSIX says that this function is always successful and that no
  14    * return value is reserved to indicate an error.  Minix syscalls
  15    * are not always successful and Minix returns the reserved value
  16    * (pid_t) -1 when there is an error.
  17    */
  18   if (_syscall(PM_PROC_NR, PM_GETPID, &m) < 0) return(-1);
  19   return(m.m_pm_lc_getpid.parent_pid);
  20 }