1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright 2003 Alexander Kabaev. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #ifndef _RTLD_LOCK_H_ 31 #define _RTLD_LOCK_H_ 32 33 #define RTLI_VERSION 0x01 34 #define MAX_RTLD_LOCKS 8 35 36 struct RtldLockInfo 37 { 38 unsigned int rtli_version; 39 void *(*lock_create)(void); 40 void (*lock_destroy)(void *); 41 void (*rlock_acquire)(void *); 42 void (*wlock_acquire)(void *); 43 void (*lock_release)(void *); 44 int (*thread_set_flag)(int); 45 int (*thread_clr_flag)(int); 46 void (*at_fork)(void); 47 }; 48 49 extern void _rtld_thread_init(struct RtldLockInfo *) __exported; 50 extern void _rtld_atfork_pre(int *) __exported; 51 extern void _rtld_atfork_post(int *) __exported; 52 53 #ifdef IN_RTLD 54 55 struct rtld_lock; 56 typedef struct rtld_lock *rtld_lock_t; 57 58 extern rtld_lock_t rtld_bind_lock; 59 extern rtld_lock_t rtld_libc_lock; 60 extern rtld_lock_t rtld_phdr_lock; 61 62 #define RTLD_LOCK_UNLOCKED 0 63 #define RTLD_LOCK_RLOCKED 1 64 #define RTLD_LOCK_WLOCKED 2 65 66 struct Struct_RtldLockState; 67 typedef struct Struct_RtldLockState RtldLockState; 68 69 void rlock_acquire(rtld_lock_t, RtldLockState *); 70 void wlock_acquire(rtld_lock_t, RtldLockState *); 71 void lock_release(rtld_lock_t, RtldLockState *); 72 void lock_upgrade(rtld_lock_t, RtldLockState *); 73 void lock_restart_for_upgrade(RtldLockState *); 74 75 #endif /* IN_RTLD */ 76 77 #endif 78