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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 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 "lint.h" 30 #include <mtlib.h> 31 #include <sys/types.h> 32 #include <synch.h> 33 #include <thread.h> 34 #include <pthread.h> 35 #include "libc.h" 36 37 /* 38 * fork1-safety. 39 * These three routines were used to make some libc interfaces fork1-safe. 40 * With the merge of libthread into libc, almost all libc internal-only 41 * locks are acquired via lmutex_lock() or lrw_rdlock()/lrw_wrlock(), 42 * which makes them automatically fork1-safe (as well as async-signal 43 * safe), so these functions are now used only for the locks that cannot 44 * be used with lmutex_lock or lrw_rdlock()/lrw_wrlock(). 45 */ 46 47 extern void atexit_locks(void); 48 extern void atexit_unlocks(void); 49 50 extern void stdio_locks(void); 51 extern void stdio_unlocks(void); 52 53 extern void malloc_locks(void); 54 extern void malloc_unlocks(void); 55 56 static void 57 libc_prepare_atfork(void) 58 { 59 atexit_locks(); 60 stdio_locks(); 61 malloc_locks(); 62 } 63 64 static void 65 libc_child_atfork(void) 66 { 67 malloc_unlocks(); 68 stdio_unlocks(); 69 atexit_unlocks(); 70 } 71 72 static void 73 libc_parent_atfork(void) 74 { 75 malloc_unlocks(); 76 stdio_unlocks(); 77 atexit_unlocks(); 78 } 79 80 /* called from libc_init() */ 81 void 82 atfork_init(void) 83 { 84 (void) pthread_atfork(libc_prepare_atfork, 85 libc_parent_atfork, libc_child_atfork); 86 } 87