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9bc48e5ebf
Our approach is to have the parent wait for SIGUSR2, and send that from the child just before it calls exec* or _exit.
47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 2008 by Denys Vlasenko <vda.linux@googlemail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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/* Keeping it separate allows to NOT suck in stdio for VERY small applets.
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* Try building busybox with only "true" enabled... */
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#include "libbb.h"
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int die_sleep;
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#if ENABLE_FEATURE_PREFER_APPLETS || ENABLE_HUSH
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jmp_buf die_jmp;
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#endif
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void FAST_FUNC xfunc_die(void)
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{
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int forked;
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if (die_sleep) {
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if ((ENABLE_FEATURE_PREFER_APPLETS || ENABLE_HUSH)
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&& die_sleep < 0
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) {
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/* Special case. We arrive here if NOFORK applet
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* calls xfunc, which then decides to die.
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* We don't die, but jump instead back to caller.
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* NOFORK applets still cannot carelessly call xfuncs:
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* p = xmalloc(10);
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* q = xmalloc(10); // BUG! if this dies, we leak p!
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*/
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/* -2222 means "zero" (longjmp can't pass 0)
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* run_nofork_applet() catches -2222. */
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longjmp(die_jmp, xfunc_error_retval ? xfunc_error_retval : -2222);
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}
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sleep(die_sleep);
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}
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forked = signal_parent_to_resume();
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if (!forked)
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exit(xfunc_error_retval);
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else
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_exit(xfunc_error_retval);
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}
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