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 <signal.h>
  15
  16 #ifdef HAVE_SYS_WAIT_H
  17 # include <sys/wait.h>
  18 #endif
  19
  20 int
  21 pidwait (pid_t id, int sigsok)
  22 {
  23     pid_t pid;
  24     SIGNAL_HANDLER istat, qstat;
  25
  26 #ifdef WAITINT
  27     int status;
  28 #else
  29     union wait status;
  30 #endif
  31
  32     if (sigsok == -1) {
  33         /* ignore a couple of signals */
  34         istat = SIGNAL (SIGINT, SIG_IGN);
  35         qstat = SIGNAL (SIGQUIT, SIG_IGN);
  36     }
  37
  38 #ifdef HAVE_WAITPID
  39     pid = waitpid(id, &status, 0);
  40 #else
  41     while ((pid = wait(&status)) != -1 && pid != id)
  42         continue;
  43 #endif
  44
  45     if (sigsok == -1) {
  46         /* reset the signal handlers */
  47         SIGNAL (SIGINT, istat);
  48         SIGNAL (SIGQUIT, qstat);
  49     }
  50
  51 #ifdef WAITINT
  52     return (pid == -1 ? -1 : status);
  53 #else
  54     return (pid == -1 ? -1 : status.w_status);
  55 #endif
  56 }