diplodocus.org Git - nmh/blob - docs/historical/mh-6.8.5/sbr/pidwait.c

   1 /* pidwait.c - wait for child to exit */
   2 #ifndef lint
   3 static char ident[] = "@(#)$Id: pidwait.c,v 1.10 1992/12/15 00:20:22 jromine Exp $";
   4 #endif  /* lint */
   5
   6 #include "../h/mh.h"
   7 #include <signal.h>
   8 #include <stdio.h>
   9 #if defined (BSD42) || defined (SVR4)
  10 #include <sys/wait.h>
  11 #endif
  12
  13
  14 int     pidwait (id, sigsok)
  15 register int     id,
  16                  sigsok;
  17 {
  18     register int    pid;
  19     TYPESIG (*hstat) (), (*istat) (), (*qstat) (), (*tstat) ();
  20 #if     defined(BSD42) && !defined(WAITINT)
  21     union wait status;
  22 #else
  23     int     status;
  24 #endif
  25
  26     if (sigsok == NOTOK) {
  27 #ifdef  notdef          /* I don't see why to trap these... */
  28         hstat = signal (SIGHUP, SIG_IGN);
  29         tstat = signal (SIGTERM, SIG_IGN);
  30 #endif
  31         istat = signal (SIGINT, SIG_IGN);
  32         qstat = signal (SIGQUIT, SIG_IGN);
  33     }
  34
  35 #ifdef  SVR4
  36     pid = waitpid (id, &status, WUNTRACED);
  37 #else
  38     while ((pid = wait (&status)) != NOTOK && pid != id)
  39         continue;
  40 #endif
  41
  42     if (sigsok == NOTOK) {
  43 #ifdef  notdef
  44         (void) signal (SIGHUP, hstat);
  45         (void) signal (SIGTERM, tstat);
  46 #endif
  47         (void) signal (SIGINT, istat);
  48         (void) signal (SIGQUIT, qstat);
  49     }
  50
  51 #if defined(BSD42) && !defined(WAITINT)
  52     return (pid == NOTOK ? NOTOK : status.w_status);
  53 #else
  54     return (pid == NOTOK ? NOTOK : status);
  55 #endif
  56 }