1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include "synonyms.h" 30 #include <mtlib.h> 31 #include <sys/types.h> 32 #include <synch.h> 33 #include <thread.h> 34 #include "libc.h" 35 36 /* 37 * fork1-safety. 38 * These three routines were used to make some libc interfaces fork1-safe. 39 * With the merge of libthread into libc, almost all libc internal-only 40 * locks are acquired via lmutex_lock() or lrw_rdlock()/lrw_wrlock(), 41 * which makes them automatically fork1-safe (as well as async-signal 42 * safe), so these functions are now used only for the locks that cannot 43 * be used with lmutex_lock or lrw_rdlock()/lrw_wrlock(). 44 */ 45 46 extern void atexit_locks(void); 47 extern void atexit_unlocks(void); 48 49 extern void stdio_locks(void); 50 extern void stdio_unlocks(void); 51 52 static void 53 libc_prepare_atfork(void) 54 { 55 atexit_locks(); 56 stdio_locks(); 57 } 58 59 static void 60 libc_child_atfork(void) 61 { 62 stdio_unlocks(); 63 atexit_unlocks(); 64 } 65 66 static void 67 libc_parent_atfork(void) 68 { 69 stdio_unlocks(); 70 atexit_unlocks(); 71 } 72 73 /* called from libc_init() */ 74 void 75 atfork_init(void) 76 { 77 /* same as pthread_atfork() but private to libc */ 78 extern int _private_pthread_atfork(void (*)(void), 79 void (*)(void), void (*)(void)); 80 81 (void) _private_pthread_atfork(libc_prepare_atfork, 82 libc_parent_atfork, libc_child_atfork); 83 } 84