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

   1
   2 /*
   3  * pidwait.c -- wait for child to exit
   4  *
   5  * $Id$
   6  *
   7  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   8  * COPYRIGHT file in the root directory of the nmh distribution for
   9  * complete copyright information.
  10  */
  11
  12 #include <h/mh.h>
  13 #include <h/signals.h>
  14 #include <errno.h>
  15 #include <signal.h>
  16
  17 #ifdef HAVE_SYS_WAIT_H
  18 # include <sys/wait.h>
  19 #endif
  20
  21 int
  22 pidwait (pid_t id, int sigsok)
  23 {
  24     pid_t pid;
  25     SIGNAL_HANDLER istat, qstat;
  26
  27 #ifdef WAITINT
  28     int status;
  29 #else
  30     union wait status;
  31 #endif
  32
  33     if (sigsok == -1) {
  34         /* ignore a couple of signals */
  35         istat = SIGNAL (SIGINT, SIG_IGN);
  36         qstat = SIGNAL (SIGQUIT, SIG_IGN);
  37     }
  38
  39 #ifdef HAVE_WAITPID
  40     while ((pid = waitpid(id, &status, 0)) == -1 && errno == EINTR)
  41         ;
  42 #else
  43     while ((pid = wait(&status)) != -1 && pid != id)
  44         continue;
  45 #endif
  46
  47     if (sigsok == -1) {
  48         /* reset the signal handlers */
  49         SIGNAL (SIGINT, istat);
  50         SIGNAL (SIGQUIT, qstat);
  51     }
  52
  53 #ifdef WAITINT
  54     return (pid == -1 ? -1 : status);
  55 #else
  56     return (pid == -1 ? -1 : status.w_status);
  57 #endif
  58 }