release/src/router/busybox/libbb/xfunc_die.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Utility routines.
   4  *
   5  * Copyright (C) 2008 by Denys Vlasenko <vda.linux@googlemail.com>
   6  *
   7  * Licensed under GPLv2, see file LICENSE in this source tree.
   8  */
   9
  10 /* Keeping it separate allows to NOT suck in stdio for VERY small applets.
  11  * Try building busybox with only "true" enabled... */
  12
  13 #include "libbb.h"
  14
  15 int die_sleep;
  16 #if ENABLE_FEATURE_PREFER_APPLETS || ENABLE_HUSH
  17 jmp_buf die_jmp;
  18 #endif
  19
  20 void FAST_FUNC xfunc_die(void)
  21 {
  22         if (die_sleep) {
  23                 if ((ENABLE_FEATURE_PREFER_APPLETS || ENABLE_HUSH)
  24                  && die_sleep < 0
  25                 ) {
  26                         /* Special case. We arrive here if NOFORK applet
  27                          * calls xfunc, which then decides to die.
  28                          * We don't die, but jump instead back to caller.
  29                          * NOFORK applets still cannot carelessly call xfuncs:
  30                          * p = xmalloc(10);
  31                          * q = xmalloc(10); // BUG! if this dies, we leak p!
  32                          */
  33                         /* -2222 means "zero" (longjmp can't pass 0)
  34                          * run_nofork_applet() catches -2222. */
  35                         longjmp(die_jmp, xfunc_error_retval ? xfunc_error_retval : -2222);
  36                 }
  37                 sleep(die_sleep);
  38         }
  39         exit(xfunc_error_retval);
  40 }