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

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