1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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_ONE 0x01 34 #define RTLI_VERSION 0x02 35 36 #define MAX_RTLD_LOCKS 8 37 38 /* 39 * This structure is part of the ABI between rtld and threading 40 * libraries, like libthr and even libc_r. Its layout is fixed and 41 * can be changed only by appending new fields at the end, with the 42 * bump of RTLI_VERSION. 43 */ 44 struct RtldLockInfo 45 { 46 /* 47 * Valid if the object calling _rtld_thread_init() exported 48 * symbol _pli_rtli_version. Otherwise assume RTLI_VERSION_ONE. 49 */ 50 unsigned int rtli_version; 51 52 void *(*lock_create)(void); 53 void (*lock_destroy)(void *); 54 void (*rlock_acquire)(void *); 55 void (*wlock_acquire)(void *); 56 void (*lock_release)(void *); 57 int (*thread_set_flag)(int); 58 int (*thread_clr_flag)(int); 59 void (*at_fork)(void); 60 61 /* Version 2 fields */ 62 char *(*dlerror_loc)(void); 63 int *(*dlerror_seen)(void); 64 int dlerror_loc_sz; 65 }; 66 67 #if defined(IN_RTLD) || defined(PTHREAD_KERNEL) 68 69 void _rtld_thread_init(struct RtldLockInfo *) __exported; 70 void _rtld_atfork_pre(int *) __exported; 71 void _rtld_atfork_post(int *) __exported; 72 73 #endif /* IN_RTLD || PTHREAD_KERNEL */ 74 75 #ifdef IN_RTLD 76 77 struct rtld_lock; 78 typedef struct rtld_lock *rtld_lock_t; 79 80 extern rtld_lock_t rtld_bind_lock; 81 extern rtld_lock_t rtld_libc_lock; 82 extern rtld_lock_t rtld_phdr_lock; 83 84 extern struct RtldLockInfo lockinfo; 85 86 #define RTLD_LOCK_UNLOCKED 0 87 #define RTLD_LOCK_RLOCKED 1 88 #define RTLD_LOCK_WLOCKED 2 89 90 struct Struct_RtldLockState; 91 typedef struct Struct_RtldLockState RtldLockState; 92 93 void rlock_acquire(rtld_lock_t, RtldLockState *); 94 void wlock_acquire(rtld_lock_t, RtldLockState *); 95 void lock_release(rtld_lock_t, RtldLockState *); 96 void lock_upgrade(rtld_lock_t, RtldLockState *); 97 void lock_restart_for_upgrade(RtldLockState *); 98 99 void dlerror_dflt_init(void); 100 101 #endif /* IN_RTLD */ 102 103 #endif 104