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
  13 int
  14 pidwait (pid_t id, int sigsok)
  15 {
  16     pid_t pid;
  17     SIGNAL_HANDLER istat = NULL, qstat = NULL;
  18
  19     int status;
  20
  21     if (sigsok == -1) {
  22         /* ignore a couple of signals */
  23         istat = SIGNAL (SIGINT, SIG_IGN);
  24         qstat = SIGNAL (SIGQUIT, SIG_IGN);
  25     }
  26
  27     while ((pid = waitpid(id, &status, 0)) == -1 && errno == EINTR)
  28         ;
  29
  30     if (sigsok == -1) {
  31         /* reset the signal handlers */
  32         SIGNAL (SIGINT, istat);
  33         SIGNAL (SIGQUIT, qstat);
  34     }
  35
  36     return (pid == -1 ? -1 : status);
  37 }