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 <errno.h>
  13 #include <signal.h>
  14 #include <sys/wait.h>
  15
  16 int
  17 pidwait (pid_t id, int sigsok)
  18 {
  19     pid_t pid;
  20     SIGNAL_HANDLER istat = NULL, qstat = NULL;
  21
  22     int status;
  23
  24     if (sigsok == -1) {
  25         /* ignore a couple of signals */
  26         istat = SIGNAL (SIGINT, SIG_IGN);
  27         qstat = SIGNAL (SIGQUIT, SIG_IGN);
  28     }
  29
  30     while ((pid = waitpid(id, &status, 0)) == -1 && errno == EINTR)
  31         ;
  32
  33     if (sigsok == -1) {
  34         /* reset the signal handlers */
  35         SIGNAL (SIGINT, istat);
  36         SIGNAL (SIGQUIT, qstat);
  37     }
  38
  39     return (pid == -1 ? -1 : status);
  40 }