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 #include "lint.h" 28 #include <mtlib.h> 29 #include <sys/types.h> 30 #include <synch.h> 31 #include <thread.h> 32 #include <pthread.h> 33 #include "libc.h" 34 35 /* 36 * fork1-safety. 37 * These three routines were used to make some libc interfaces fork1-safe. 38 * With the merge of libthread into libc, almost all libc internal-only 39 * locks are acquired via lmutex_lock() or lrw_rdlock()/lrw_wrlock(), 40 * which makes them automatically fork1-safe (as well as async-signal 41 * safe), so these functions are now used only for the locks that cannot 42 * be used with lmutex_lock or lrw_rdlock()/lrw_wrlock(). 43 */ 44 45 extern void atexit_locks(void); 46 extern void atexit_unlocks(void); 47 48 extern void stdio_locks(void); 49 extern void stdio_unlocks(void); 50 51 extern void malloc_locks(void); 52 extern void malloc_unlocks(void); 53 54 static void libc_prepare_atfork(void)55libc_prepare_atfork(void) 56 { 57 atexit_locks(); 58 stdio_locks(); 59 malloc_locks(); 60 } 61 62 static void libc_child_atfork(void)63libc_child_atfork(void) 64 { 65 malloc_unlocks(); 66 stdio_unlocks(); 67 atexit_unlocks(); 68 } 69 70 static void libc_parent_atfork(void)71libc_parent_atfork(void) 72 { 73 malloc_unlocks(); 74 stdio_unlocks(); 75 atexit_unlocks(); 76 } 77 78 /* called from libc_init() */ 79 void atfork_init(void)80atfork_init(void) 81 { 82 (void) pthread_atfork(libc_prepare_atfork, 83 libc_parent_atfork, libc_child_atfork); 84 } 85