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

   1 /* push.c - push a fork into the background */
   2 #ifndef lint
   3 static char ident[] = "@(#)$Id: push.c,v 1.3 1992/12/15 00:20:22 jromine Exp $";
   4 #endif  /* lint */
   5
   6 #include "../h/mh.h"
   7 #include <stdio.h>
   8 #include <signal.h>
   9
  10
  11 void    push () {
  12     register int     i;
  13
  14     for (i = 0; i < 5; i++) {
  15         switch (fork ()) {
  16             case NOTOK:
  17                 sleep (5);
  18                 continue;
  19
  20             case OK:
  21                 (void) signal (SIGHUP, SIG_IGN);
  22                 (void) signal (SIGINT, SIG_IGN);
  23                 (void) signal (SIGQUIT, SIG_IGN);
  24                 (void) signal (SIGTERM, SIG_IGN);
  25 #ifdef  SIGTSTP
  26                 (void) signal (SIGTSTP, SIG_IGN);
  27                 (void) signal (SIGTTIN, SIG_IGN);
  28                 (void) signal (SIGTTOU, SIG_IGN);
  29 #endif  /* SIGTSTP */
  30                 (void) freopen ("/dev/null", "r", stdin);
  31                 (void) freopen ("/dev/null", "w", stdout);
  32                 break;
  33
  34             default:
  35                 done (0);
  36         }
  37         break;
  38     }
  39     if (i >= 5)
  40         advise (NULLCP, "unable to fork, so can't push...");
  41 }