1 /* 2 * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the author nor the names of any co-contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: head/lib/libc/include/libc_private.h 213153 2010-09-25 01:57:47Z davidxu $ 30 * 31 * Private definitions for libc and libpthread. 32 */ 33 34 #ifndef _LIBC_PRIVATE_H_ 35 #define _LIBC_PRIVATE_H_ 36 37 #include <sys/_pthreadtypes.h> 38 #include <machine/stdint.h> 39 40 /* 41 * With this attribute set, do not require a function call for accessing 42 * this variable when the code is compiled -fPIC. Use in combination 43 * with __thread. 44 * 45 * Must be empty for libc_rtld. 46 */ 47 #ifdef __LIBC_RTLD 48 #define TLS_ATTRIBUTE 49 #else 50 #define TLS_ATTRIBUTE __attribute__ ((tls_model ("initial-exec"))) 51 #endif 52 53 /* 54 * This global flag is non-zero when a process has created one 55 * or more threads. It is used to avoid calling locking functions 56 * when they are not required. 57 */ 58 #ifndef __LIBC_ISTHREADED_DECLARED 59 #define __LIBC_ISTHREADED_DECLARED 60 extern int __isthreaded; 61 #endif 62 63 /* 64 * File lock contention is difficult to diagnose without knowing 65 * where locks were set. Allow a debug library to be built which 66 * records the source file and line number of each lock call. 67 */ 68 #ifdef _FLOCK_DEBUG 69 #define _FLOCKFILE(x) _flockfile_debug(x, __FILE__, __LINE__) 70 #else 71 #define _FLOCKFILE(x) _flockfile(x) 72 #endif 73 74 /* 75 * Macros for locking and unlocking FILEs. These test if the 76 * process is threaded to avoid locking when not required. 77 */ 78 #define FLOCKFILE(fp) if (__isthreaded) _FLOCKFILE(fp) 79 #define FUNLOCKFILE(fp) if (__isthreaded) _funlockfile(fp) 80 81 /* 82 * Initialise TLS static programs 83 */ 84 int __get_errno_GS_offset(void); 85 void *__get_errno_GOT_ptr(void); 86 87 struct statfs; 88 struct statvfs; 89 90 /* 91 * yplib internal interfaces 92 */ 93 #ifdef YP 94 int _yp_check(char **); 95 #endif 96 97 /* 98 * This is a pointer in the C run-time startup code. It is used 99 * by getprogname() and setprogname(). 100 */ 101 extern const char *__progname; 102 extern int __isexiting; 103 104 /* 105 * Notify libc that thread is exiting and its TLS destructors can be called. 106 */ 107 void _thread_finalize(void); 108 109 /* 110 * Function to clean up streams, called from abort() and exit(). 111 */ 112 extern void (*__cleanup)(void); 113 114 /* execve() with PATH processing to implement posix_spawnp() */ 115 int _execvpe(const char *, char * const *, char * const *); 116 void _libc_thr_init(void); 117 void _nmalloc_thr_init(void); 118 void _upmap_thr_init(void); 119 void _nmalloc_thr_prepfork(void); 120 void _nmalloc_thr_parentfork(void); 121 void _nmalloc_thr_childfork(void); 122 123 struct dl_phdr_info; 124 int __elf_phdr_match_addr(struct dl_phdr_info *, void *); 125 void __libc_distribute_static_tls(__size_t, void *, __size_t, __size_t); 126 __uintptr_t __libc_static_tls_base(__size_t); 127 128 /* 129 * libc should use libc_dlopen internally, which respects a global 130 * flag where loading of new shared objects can be restricted. 131 */ 132 void *libc_dlopen(const char *, int); 133 134 /* 135 * For dynamic linker 136 */ 137 void _rtld_error(const char *fmt, ...); 138 139 /* 140 * Provides pthread_once()-like functionality for both single-threaded 141 * and multi-threaded applications 142 */ 143 int _once(pthread_once_t *, void (*)(void)); 144 145 void __throw_constraint_handler_s(const char * restrict msg, int error); 146 147 #endif /* _LIBC_PRIVATE_H_ */ 148