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

   1
   2 /*
   3  * pidwait.c -- wait for child to exit
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #include <h/mh.h>
  11 #include <h/signals.h>
  12 #include <signal.h>
  13
  14 int
  15 pidwait (pid_t id, int sigsok)
  16 {
  17     pid_t pid;
  18     SIGNAL_HANDLER istat = NULL, qstat = NULL;
  19
  20     int status;
  21
  22     if (sigsok == -1) {
  23         /* ignore a couple of signals */
  24         istat = SIGNAL (SIGINT, SIG_IGN);
  25         qstat = SIGNAL (SIGQUIT, SIG_IGN);
  26     }
  27
  28     while ((pid = waitpid(id, &status, 0)) == -1 && errno == EINTR)
  29         ;
  30
  31     if (sigsok == -1) {
  32         /* reset the signal handlers */
  33         SIGNAL (SIGINT, istat);
  34         SIGNAL (SIGQUIT, qstat);
  35     }
  36
  37     return (pid == -1 ? -1 : status);
  38 }