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
  15 #ifdef HAVE_SYS_WAIT_H
  16 # include <sys/wait.h>
  17 #endif
  18
  19 int
  20 pidwait (pid_t id, int sigsok)
  21 {
  22     pid_t pid;
  23     SIGNAL_HANDLER istat = NULL, qstat = NULL;
  24
  25 #ifdef HAVE_UNION_WAIT
  26     union wait status;
  27 #else
  28     int status;
  29 #endif
  30
  31     if (sigsok == -1) {
  32         /* ignore a couple of signals */
  33         istat = SIGNAL (SIGINT, SIG_IGN);
  34         qstat = SIGNAL (SIGQUIT, SIG_IGN);
  35     }
  36
  37 #ifdef HAVE_WAITPID
  38     while ((pid = waitpid(id, &status, 0)) == -1 && errno == EINTR)
  39         ;
  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 HAVE_UNION_WAIT
  52     return (pid == -1 ? -1 : status.w_status);
  53 #else
  54     return (pid == -1 ? -1 : status);
  55 #endif
  56 }