17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 52333b8a2Sraf * Common Development and Distribution License (the "License"). 62333b8a2Sraf * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 212333b8a2Sraf 227c478bd9Sstevel@tonic-gate /* 238cd45542Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 247c478bd9Sstevel@tonic-gate * Use is subject to license terms. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate 27*7257d1b4Sraf #include "lint.h" 287c478bd9Sstevel@tonic-gate #include <mtlib.h> 297c478bd9Sstevel@tonic-gate #include <sys/types.h> 307c478bd9Sstevel@tonic-gate #include <synch.h> 317c478bd9Sstevel@tonic-gate #include <thread.h> 328cd45542Sraf #include <pthread.h> 337c478bd9Sstevel@tonic-gate #include "libc.h" 347c478bd9Sstevel@tonic-gate 357c478bd9Sstevel@tonic-gate /* 367c478bd9Sstevel@tonic-gate * fork1-safety. 377c478bd9Sstevel@tonic-gate * These three routines were used to make some libc interfaces fork1-safe. 387c478bd9Sstevel@tonic-gate * With the merge of libthread into libc, almost all libc internal-only 397c478bd9Sstevel@tonic-gate * locks are acquired via lmutex_lock() or lrw_rdlock()/lrw_wrlock(), 407c478bd9Sstevel@tonic-gate * which makes them automatically fork1-safe (as well as async-signal 417c478bd9Sstevel@tonic-gate * safe), so these functions are now used only for the locks that cannot 427c478bd9Sstevel@tonic-gate * be used with lmutex_lock or lrw_rdlock()/lrw_wrlock(). 437c478bd9Sstevel@tonic-gate */ 447c478bd9Sstevel@tonic-gate 457c478bd9Sstevel@tonic-gate extern void atexit_locks(void); 467c478bd9Sstevel@tonic-gate extern void atexit_unlocks(void); 477c478bd9Sstevel@tonic-gate 487c478bd9Sstevel@tonic-gate extern void stdio_locks(void); 497c478bd9Sstevel@tonic-gate extern void stdio_unlocks(void); 507c478bd9Sstevel@tonic-gate 512333b8a2Sraf extern void malloc_locks(void); 522333b8a2Sraf extern void malloc_unlocks(void); 532333b8a2Sraf 547c478bd9Sstevel@tonic-gate static void libc_prepare_atfork(void)557c478bd9Sstevel@tonic-gatelibc_prepare_atfork(void) 567c478bd9Sstevel@tonic-gate { 577c478bd9Sstevel@tonic-gate atexit_locks(); 587c478bd9Sstevel@tonic-gate stdio_locks(); 592333b8a2Sraf malloc_locks(); 607c478bd9Sstevel@tonic-gate } 617c478bd9Sstevel@tonic-gate 627c478bd9Sstevel@tonic-gate static void libc_child_atfork(void)637c478bd9Sstevel@tonic-gatelibc_child_atfork(void) 647c478bd9Sstevel@tonic-gate { 652333b8a2Sraf malloc_unlocks(); 667c478bd9Sstevel@tonic-gate stdio_unlocks(); 677c478bd9Sstevel@tonic-gate atexit_unlocks(); 687c478bd9Sstevel@tonic-gate } 697c478bd9Sstevel@tonic-gate 707c478bd9Sstevel@tonic-gate static void libc_parent_atfork(void)717c478bd9Sstevel@tonic-gatelibc_parent_atfork(void) 727c478bd9Sstevel@tonic-gate { 732333b8a2Sraf malloc_unlocks(); 747c478bd9Sstevel@tonic-gate stdio_unlocks(); 757c478bd9Sstevel@tonic-gate atexit_unlocks(); 767c478bd9Sstevel@tonic-gate } 777c478bd9Sstevel@tonic-gate 787c478bd9Sstevel@tonic-gate /* called from libc_init() */ 797c478bd9Sstevel@tonic-gate void atfork_init(void)807c478bd9Sstevel@tonic-gateatfork_init(void) 817c478bd9Sstevel@tonic-gate { 828cd45542Sraf (void) pthread_atfork(libc_prepare_atfork, 838cd45542Sraf libc_parent_atfork, libc_child_atfork); 847c478bd9Sstevel@tonic-gate } 85