1 /* $OpenBSD: atfork.c,v 1.2 2015/11/10 04:14:03 guenther Exp $ */ 2 3 /* 4 * Copyright (c) 2008 Kurt Miller <kurt@openbsd.org> 5 * Copyright (c) 2008 Philip Guenther <guenther@openbsd.org> 6 * Copyright (c) 2003 Daniel Eischen <deischen@freebsd.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Neither the name of the author nor the names of any co-contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD: /repoman/r/ncvs/src/lib/libc_r/uthread/uthread_atfork.c,v 1.1 2004/12/10 03:36:45 grog Exp $ 31 */ 32 33 #include <errno.h> 34 #include <stdlib.h> 35 #include <pthread.h> 36 37 #include "thread_private.h" 38 #include "atfork.h" 39 40 int _thread_atfork(void (*_prepare)(void), void (*_parent)(void), 41 void (*_child)(void), void *_dso); 42 PROTO_NORMAL(_thread_atfork); 43 44 int 45 _thread_atfork(void (*prepare)(void), void (*parent)(void), 46 void (*child)(void), void *dso) 47 { 48 struct atfork_fn *af; 49 50 if ((af = malloc(sizeof *af)) == NULL) 51 return (ENOMEM); 52 53 af->fn_prepare = prepare; 54 af->fn_parent = parent; 55 af->fn_child = child; 56 af->fn_dso = dso; 57 _ATFORK_LOCK(); 58 TAILQ_INSERT_TAIL(&_atfork_list, af, fn_next); 59 _ATFORK_UNLOCK(); 60 return (0); 61 } 62 DEF_STRONG(_thread_atfork); 63 64 /* 65 * Copy of pthread_atfork() used by libc and anything staticly linked 66 * into the executable. This passes NULL for the dso, so the callbacks 67 * are never removed by dlclose() 68 */ 69 int 70 pthread_atfork(void (*prep)(void), void (*parent)(void), void (*child)(void)) 71 { 72 return (_thread_atfork(prep, parent, child, NULL)); 73 } 74