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102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright 2003 Alexander Kabaev.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _RTLD_LOCK_H_
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#define _RTLD_LOCK_H_
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#define RTLI_VERSION_ONE 0x01
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#define RTLI_VERSION 0x02
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#define MAX_RTLD_LOCKS 8
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/*
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* This structure is part of the ABI between rtld and threading
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* libraries, like libthr and even libc_r. Its layout is fixed and
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* can be changed only by appending new fields at the end, with the
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* bump of RTLI_VERSION.
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*/
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struct RtldLockInfo
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{
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/*
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* Valid if the object calling _rtld_thread_init() exported
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* symbol _pli_rtli_version. Otherwise assume RTLI_VERSION_ONE.
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*/
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unsigned int rtli_version;
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void *(*lock_create)(void);
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void (*lock_destroy)(void *);
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void (*rlock_acquire)(void *);
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void (*wlock_acquire)(void *);
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void (*lock_release)(void *);
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int (*thread_set_flag)(int);
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int (*thread_clr_flag)(int);
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void (*at_fork)(void);
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/* Version 2 fields */
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char *(*dlerror_loc)(void);
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int *(*dlerror_seen)(void);
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int dlerror_loc_sz;
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};
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#if defined(IN_RTLD) || defined(PTHREAD_KERNEL)
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void _rtld_thread_init(struct RtldLockInfo *) __exported;
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void _rtld_atfork_pre(int *) __exported;
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void _rtld_atfork_post(int *) __exported;
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#endif /* IN_RTLD || PTHREAD_KERNEL */
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#ifdef IN_RTLD
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struct rtld_lock;
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typedef struct rtld_lock *rtld_lock_t;
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extern rtld_lock_t rtld_bind_lock;
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extern rtld_lock_t rtld_libc_lock;
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extern rtld_lock_t rtld_phdr_lock;
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extern struct RtldLockInfo lockinfo;
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#define RTLD_LOCK_UNLOCKED 0
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#define RTLD_LOCK_RLOCKED 1
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#define RTLD_LOCK_WLOCKED 2
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struct Struct_RtldLockState;
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typedef struct Struct_RtldLockState RtldLockState;
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void rlock_acquire(rtld_lock_t, RtldLockState *);
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void wlock_acquire(rtld_lock_t, RtldLockState *);
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void lock_release(rtld_lock_t, RtldLockState *);
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void lock_upgrade(rtld_lock_t, RtldLockState *);
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void lock_restart_for_upgrade(RtldLockState *);
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void dlerror_dflt_init(void);
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#endif /* IN_RTLD */
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#endif
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