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