lib/libc/sys-minix/getppid.c

   1 #include <sys/cdefs.h>
   2 #include "namespace.h"
   3 #include <lib.h>
   4
   5 #include <unistd.h>
   6
   7 #ifdef __weak_alias
   8 __weak_alias(getppid, _getppid)
   9 #endif
  10
  11 pid_t getppid()
  12 {
  13   message m;
  14
  15   /* POSIX says that this function is always successful and that no
  16    * return value is reserved to indicate an error.  Minix syscalls
  17    * are not always successful and Minix returns the reserved value
  18    * (pid_t) -1 when there is an error.
  19    */
  20   if (_syscall(PM_PROC_NR, MINIX_GETPID, &m) < 0) return ( (pid_t) -1);
  21   return( (pid_t) m.m2_i1);
  22 }