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/* $OpenBSD: w_fork.c,v 1.3 2016/05/07 19:05:22 guenther Exp $ */ |
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/* |
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* Copyright (c) 2008 Kurt Miller <kurt@openbsd.org> |
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* Copyright (c) 2008 Philip Guenther <guenther@openbsd.org> |
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* Copyright (c) 2003 Daniel Eischen <deischen@freebsd.org> |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Neither the name of the author nor the names of any co-contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* $FreeBSD: /repoman/r/ncvs/src/lib/libc_r/uthread/uthread_atfork.c,v 1.1 2004/12/10 03:36:45 grog Exp $ |
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*/ |
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#include <tib.h> |
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#include <unistd.h> |
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#include "thread_private.h" |
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#include "atfork.h" |
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pid_t |
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WRAP(fork)(void) |
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{ |
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struct atfork_fn *p; |
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pid_t newid; |
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/* |
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* In the common case the list is empty; remain async-signal-safe |
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* then by skipping the locking and just forking |
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*/ |
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if (TAILQ_FIRST(&_atfork_list) == NULL) { |
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if (_thread_cb.tc_fork != NULL) |
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return _thread_cb.tc_fork(); |
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newid = fork(); |
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if (newid == 0) |
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TIB_GET()->tib_tid = getthrid(); |
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return newid; |
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} |
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_ATFORK_LOCK(); |
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TAILQ_FOREACH_REVERSE(p, &_atfork_list, atfork_listhead, fn_next) |
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if (p->fn_prepare) |
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p->fn_prepare(); |
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if (_thread_cb.tc_fork != NULL) |
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newid = _thread_cb.tc_fork(); |
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else { |
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newid = fork(); |
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if (newid == 0) |
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TIB_GET()->tib_tid = getthrid(); |
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} |
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if (newid == 0) { |
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TAILQ_FOREACH(p, &_atfork_list, fn_next) |
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if (p->fn_child) |
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p->fn_child(); |
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} else { |
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TAILQ_FOREACH(p, &_atfork_list, fn_next) |
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if (p->fn_parent) |
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p->fn_parent(); |
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} |
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_ATFORK_UNLOCK(); |
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return (newid); |
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} |
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DEF_WRAP(fork); |