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

   1 /*
   2  * pidwait.c -- wait for child to exit
   3  *
   4  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   5  * COPYRIGHT file in the root directory of the nmh distribution for
   6  * complete copyright information.
   7  */
   8
   9 #include <h/mh.h>
  10 #include <h/signals.h>
  11
  12 int
  13 pidwait (pid_t id, int sigsok)
  14 {
  15     pid_t pid;
  16     SIGNAL_HANDLER istat = NULL, qstat = NULL;
  17
  18     int status;
  19
  20     if (sigsok == -1) {
  21         /* ignore a couple of signals */
  22         istat = SIGNAL (SIGINT, SIG_IGN);
  23         qstat = SIGNAL (SIGQUIT, SIG_IGN);
  24     }
  25
  26     while ((pid = waitpid(id, &status, 0)) == -1 && errno == EINTR)
  27         ;
  28
  29     if (sigsok == -1) {
  30         /* reset the signal handlers */
  31         SIGNAL (SIGINT, istat);
  32         SIGNAL (SIGQUIT, qstat);
  33     }
  34
  35     return (pid == -1 ? -1 : status);
  36 }