LXR busybox/libbb/xfunc

   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 tarball for details.
   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
  15int die_sleep;
  16#if ENABLE_FEATURE_PREFER_APPLETS || ENABLE_HUSH
  17jmp_buf die_jmp;
  18#endif
  19
  20void 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}
  41