10Sstevel@tonic-gate /* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 52186Sraf * Common Development and Distribution License (the "License"). 62186Sraf * You may not use this file except in compliance with the License. 70Sstevel@tonic-gate * 80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 100Sstevel@tonic-gate * See the License for the specific language governing permissions 110Sstevel@tonic-gate * and limitations under the License. 120Sstevel@tonic-gate * 130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 180Sstevel@tonic-gate * 190Sstevel@tonic-gate * CDDL HEADER END 200Sstevel@tonic-gate */ 212186Sraf 220Sstevel@tonic-gate /* 236515Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 240Sstevel@tonic-gate * Use is subject to license terms. 250Sstevel@tonic-gate */ 260Sstevel@tonic-gate 270Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 280Sstevel@tonic-gate 29*6812Sraf #include "lint.h" 300Sstevel@tonic-gate #include <mtlib.h> 310Sstevel@tonic-gate #include <sys/types.h> 320Sstevel@tonic-gate #include <synch.h> 330Sstevel@tonic-gate #include <thread.h> 346515Sraf #include <pthread.h> 350Sstevel@tonic-gate #include "libc.h" 360Sstevel@tonic-gate 370Sstevel@tonic-gate /* 380Sstevel@tonic-gate * fork1-safety. 390Sstevel@tonic-gate * These three routines were used to make some libc interfaces fork1-safe. 400Sstevel@tonic-gate * With the merge of libthread into libc, almost all libc internal-only 410Sstevel@tonic-gate * locks are acquired via lmutex_lock() or lrw_rdlock()/lrw_wrlock(), 420Sstevel@tonic-gate * which makes them automatically fork1-safe (as well as async-signal 430Sstevel@tonic-gate * safe), so these functions are now used only for the locks that cannot 440Sstevel@tonic-gate * be used with lmutex_lock or lrw_rdlock()/lrw_wrlock(). 450Sstevel@tonic-gate */ 460Sstevel@tonic-gate 470Sstevel@tonic-gate extern void atexit_locks(void); 480Sstevel@tonic-gate extern void atexit_unlocks(void); 490Sstevel@tonic-gate 500Sstevel@tonic-gate extern void stdio_locks(void); 510Sstevel@tonic-gate extern void stdio_unlocks(void); 520Sstevel@tonic-gate 532186Sraf extern void malloc_locks(void); 542186Sraf extern void malloc_unlocks(void); 552186Sraf 560Sstevel@tonic-gate static void libc_prepare_atfork(void)570Sstevel@tonic-gatelibc_prepare_atfork(void) 580Sstevel@tonic-gate { 590Sstevel@tonic-gate atexit_locks(); 600Sstevel@tonic-gate stdio_locks(); 612186Sraf malloc_locks(); 620Sstevel@tonic-gate } 630Sstevel@tonic-gate 640Sstevel@tonic-gate static void libc_child_atfork(void)650Sstevel@tonic-gatelibc_child_atfork(void) 660Sstevel@tonic-gate { 672186Sraf malloc_unlocks(); 680Sstevel@tonic-gate stdio_unlocks(); 690Sstevel@tonic-gate atexit_unlocks(); 700Sstevel@tonic-gate } 710Sstevel@tonic-gate 720Sstevel@tonic-gate static void libc_parent_atfork(void)730Sstevel@tonic-gatelibc_parent_atfork(void) 740Sstevel@tonic-gate { 752186Sraf malloc_unlocks(); 760Sstevel@tonic-gate stdio_unlocks(); 770Sstevel@tonic-gate atexit_unlocks(); 780Sstevel@tonic-gate } 790Sstevel@tonic-gate 800Sstevel@tonic-gate /* called from libc_init() */ 810Sstevel@tonic-gate void atfork_init(void)820Sstevel@tonic-gateatfork_init(void) 830Sstevel@tonic-gate { 846515Sraf (void) pthread_atfork(libc_prepare_atfork, 856515Sraf libc_parent_atfork, libc_child_atfork); 860Sstevel@tonic-gate } 87