diplodocus.org Git - nmh/blob - sbr/pidwait.c

   1 /* pidwait.c -- wait for child to exit
   2  *
   3  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   4  * COPYRIGHT file in the root directory of the nmh distribution for
   5  * complete copyright information.
   6  */
   7
   8 #include <h/mh.h>
   9 #include <h/signals.h>
  10
  11 int
  12 pidwait (pid_t id, int sigsok)
  13 {
  14     pid_t pid;
  15     SIGNAL_HANDLER istat = NULL, qstat = NULL;
  16
  17     int status;
  18
  19     if (sigsok == -1) {
  20         /* ignore a couple of signals */
  21         istat = SIGNAL (SIGINT, SIG_IGN);
  22         qstat = SIGNAL (SIGQUIT, SIG_IGN);
  23     }
  24
  25     while ((pid = waitpid(id, &status, 0)) == -1 && errno == EINTR)
  26         ;
  27
  28     if (sigsok == -1) {
  29         /* reset the signal handlers */
  30         SIGNAL (SIGINT, istat);
  31         SIGNAL (SIGQUIT, qstat);
  32     }
  33
  34     return pid == -1 ? -1 : status;
  35 }