lib/libc/gen/_pthread_stubs.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2001 Daniel Eischen <deischen@FreeBSD.org>.
   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 DANIEL EISCHEN AND CONTRIBUTORS ``AS IS''
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <signal.h>
  33 #include <pthread.h>
  34 #include <stdlib.h>
  35 #include <errno.h>
  36
  37 #include "libc_private.h"
  38
  39 /*
  40  * Weak symbols: All libc internal usage of these functions should
  41  * use the weak symbol versions (_pthread_XXX).  If libpthread is
  42  * linked, it will override these functions with (non-weak) routines.
  43  * The _pthread_XXX functions are provided solely for internal libc
  44  * usage to avoid unwanted cancellation points and to differentiate
  45  * between application locks and libc locks (threads holding the
  46  * latter can't be allowed to exit/terminate).
  47  */
  48
  49 /* Define a null pthread structure just to satisfy _pthread_self. */
  50 struct pthread {
  51 };
  52
  53 static struct pthread   main_thread;
  54
  55 static int              stub_main(void);
  56 static void             *stub_null(void);
  57 static struct pthread   *stub_self(void);
  58 static int              stub_zero(void);
  59 static int              stub_fail(void);
  60 static int              stub_true(void);
  61 static void             stub_exit(void);
  62
  63 #define PJT_DUAL_ENTRY(entry)   \
  64         (pthread_func_t)entry, (pthread_func_t)entry
  65
  66 pthread_func_entry_t __thr_jtable[PJT_MAX] = {
  67         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATFORK */
  68         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_DESTROY */
  69         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_GETDETACHSTATE */
  70         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_GETGUARDSIZE */
  71         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_GETINHERITSCHED */
  72         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_GETSCHEDPARAM */
  73         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_GETSCHEDPOLICY */
  74         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_GETSCOPE */
  75         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_GETSTACKADDR */
  76         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_GETSTACKSIZE */
  77         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_INIT */
  78         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_SETDETACHSTATE */
  79         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_SETGUARDSIZE */
  80         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_SETINHERITSCHED */
  81         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_SETSCHEDPARAM */
  82         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_SETSCHEDPOLICY */
  83         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_SETSCOPE */
  84         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_SETSTACKADDR */
  85         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_ATTR_SETSTACKSIZE */
  86         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_CANCEL */
  87         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_CLEANUP_POP */
  88         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_CLEANUP_PUSH */
  89         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_COND_BROADCAST */
  90         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_COND_DESTROY */
  91         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_COND_INIT */
  92         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_COND_SIGNAL */
  93         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_COND_TIMEDWAIT */
  94         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_COND_WAIT */
  95         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_DETACH */
  96         {PJT_DUAL_ENTRY(stub_true)},    /* PJT_EQUAL */
  97         {PJT_DUAL_ENTRY(stub_exit)},    /* PJT_EXIT */
  98         {PJT_DUAL_ENTRY(stub_null)},    /* PJT_GETSPECIFIC */
  99         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_JOIN */
 100         {PJT_DUAL_ENTRY(stub_fail)},    /* PJT_KEY_CREATE */
 101         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_KEY_DELETE */
 102         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_KILL */
 103         {PJT_DUAL_ENTRY(stub_main)},    /* PJT_MAIN_NP */
 104         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_MUTEXATTR_DESTROY */
 105         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_MUTEXATTR_INIT */
 106         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_MUTEXATTR_SETTYPE */
 107         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_MUTEX_DESTROY */
 108         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_MUTEX_INIT */
 109         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_MUTEX_LOCK */
 110         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_MUTEX_TRYLOCK */
 111         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_MUTEX_UNLOCK */
 112         {PJT_DUAL_ENTRY(stub_fail)},    /* PJT_ONCE */
 113         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_RWLOCK_DESTROY */
 114         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_RWLOCK_INIT */
 115         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_RWLOCK_RDLOCK */
 116         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_RWLOCK_TRYRDLOCK */
 117         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_RWLOCK_TRYWRLOCK */
 118         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_RWLOCK_UNLOCK */
 119         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_RWLOCK_WRLOCK */
 120         {PJT_DUAL_ENTRY(stub_self)},    /* PJT_SELF */
 121         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_SETCANCELSTATE */
 122         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_SETCANCELTYPE */
 123         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_SETSPECIFIC */
 124         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_SIGMASK */
 125         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_TESTCANCEL */
 126         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_CLEANUP_POP_IMP */
 127         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_CLEANUP_PUSH_IMP */
 128         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_CANCEL_ENTER */
 129         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_CANCEL_LEAVE */
 130         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_MUTEX_CONSISTENT */
 131         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_MUTEXATTR_GETROBUST */
 132         {PJT_DUAL_ENTRY(stub_zero)},    /* PJT_MUTEXATTR_SETROBUST */
 133 };
 134
 135 /*
 136  * Weak aliases for exported (pthread_*) and internal (_pthread_*) routines.
 137  */
 138 #define WEAK_REF(sym, alias)    __weak_reference(sym, alias)
 139
 140 #define FUNC_TYPE(name)         __CONCAT(name, _func_t)
 141 #define FUNC_INT(name)          __CONCAT(name, _int)
 142 #define FUNC_EXP(name)          __CONCAT(name, _exp)
 143
 144 #define STUB_FUNC(name, idx, ret)                               \
 145         static ret FUNC_EXP(name)(void) __used;                 \
 146         static ret FUNC_INT(name)(void) __used;                 \
 147         WEAK_REF(FUNC_EXP(name), name);                         \
 148         WEAK_REF(FUNC_INT(name), __CONCAT(_, name));            \
 149         typedef ret (*FUNC_TYPE(name))(void);                   \
 150         static ret FUNC_EXP(name)(void)                         \
 151         {                                                       \
 152                 FUNC_TYPE(name) func;                           \
 153                 func = (FUNC_TYPE(name))__thr_jtable[idx][0];   \
 154                 return (func());                                \
 155         }                                                       \
 156         static ret FUNC_INT(name)(void)                         \
 157         {                                                       \
 158                 FUNC_TYPE(name) func;                           \
 159                 func = (FUNC_TYPE(name))__thr_jtable[idx][1];   \
 160                 return (func());                                \
 161         }
 162
 163 #define STUB_FUNC1(name, idx, ret, p0_type)                     \
 164         static ret FUNC_EXP(name)(p0_type) __used;              \
 165         static ret FUNC_INT(name)(p0_type) __used;              \
 166         WEAK_REF(FUNC_EXP(name), name);                         \
 167         WEAK_REF(FUNC_INT(name), __CONCAT(_, name));            \
 168         typedef ret (*FUNC_TYPE(name))(p0_type);                \
 169         static ret FUNC_EXP(name)(p0_type p0)                   \
 170         {                                                       \
 171                 FUNC_TYPE(name) func;                           \
 172                 func = (FUNC_TYPE(name))__thr_jtable[idx][0];   \
 173                 return (func(p0));                              \
 174         }                                                       \
 175         static ret FUNC_INT(name)(p0_type p0)                   \
 176         {                                                       \
 177                 FUNC_TYPE(name) func;                           \
 178                 func = (FUNC_TYPE(name))__thr_jtable[idx][1];   \
 179                 return (func(p0));                              \
 180         }
 181
 182 #define STUB_FUNC2(name, idx, ret, p0_type, p1_type)            \
 183         static ret FUNC_EXP(name)(p0_type, p1_type) __used;     \
 184         static ret FUNC_INT(name)(p0_type, p1_type) __used;     \
 185         WEAK_REF(FUNC_EXP(name), name);                         \
 186         WEAK_REF(FUNC_INT(name), __CONCAT(_, name));            \
 187         typedef ret (*FUNC_TYPE(name))(p0_type, p1_type);       \
 188         static ret FUNC_EXP(name)(p0_type p0, p1_type p1)       \
 189         {                                                       \
 190                 FUNC_TYPE(name) func;                           \
 191                 func = (FUNC_TYPE(name))__thr_jtable[idx][0];   \
 192                 return (func(p0, p1));                          \
 193         }                                                       \
 194         static ret FUNC_INT(name)(p0_type p0, p1_type p1)       \
 195         {                                                       \
 196                 FUNC_TYPE(name) func;                           \
 197                 func = (FUNC_TYPE(name))__thr_jtable[idx][1];   \
 198                 return (func(p0, p1));                          \
 199         }
 200
 201 #define STUB_FUNC3(name, idx, ret, p0_type, p1_type, p2_type)   \
 202         static ret FUNC_EXP(name)(p0_type, p1_type, p2_type) __used; \
 203         static ret FUNC_INT(name)(p0_type, p1_type, p2_type) __used; \
 204         WEAK_REF(FUNC_EXP(name), name);                         \
 205         WEAK_REF(FUNC_INT(name), __CONCAT(_, name));            \
 206         typedef ret (*FUNC_TYPE(name))(p0_type, p1_type, p2_type); \
 207         static ret FUNC_EXP(name)(p0_type p0, p1_type p1, p2_type p2) \
 208         {                                                       \
 209                 FUNC_TYPE(name) func;                           \
 210                 func = (FUNC_TYPE(name))__thr_jtable[idx][0];   \
 211                 return (func(p0, p1, p2));                      \
 212         }                                                       \
 213         static ret FUNC_INT(name)(p0_type p0, p1_type p1, p2_type p2) \
 214         {                                                       \
 215                 FUNC_TYPE(name) func;                           \
 216                 func = (FUNC_TYPE(name))__thr_jtable[idx][1];   \
 217                 return (func(p0, p1, p2));                      \
 218         }
 219
 220 STUB_FUNC1(pthread_cond_broadcast, PJT_COND_BROADCAST, int, void *)
 221 STUB_FUNC1(pthread_cond_destroy, PJT_COND_DESTROY, int, void *)
 222 STUB_FUNC2(pthread_cond_init,   PJT_COND_INIT, int, void *, void *)
 223 STUB_FUNC1(pthread_cond_signal, PJT_COND_SIGNAL, int, void *)
 224 STUB_FUNC2(pthread_cond_wait,   PJT_COND_WAIT, int, void *, void *)
 225 STUB_FUNC1(pthread_getspecific, PJT_GETSPECIFIC, void *, pthread_key_t)
 226 STUB_FUNC2(pthread_key_create,  PJT_KEY_CREATE, int, void *, void *)
 227 STUB_FUNC1(pthread_key_delete,  PJT_KEY_DELETE, int, pthread_key_t)
 228 STUB_FUNC(pthread_main_np,      PJT_MAIN_NP, int)
 229 STUB_FUNC1(pthread_mutex_destroy, PJT_MUTEX_DESTROY, int, void *)
 230 STUB_FUNC2(pthread_mutex_init,  PJT_MUTEX_INIT, int, void *, void *)
 231 STUB_FUNC1(pthread_mutex_lock,  PJT_MUTEX_LOCK, int, void *)
 232 STUB_FUNC1(pthread_mutex_trylock, PJT_MUTEX_TRYLOCK, int, void *)
 233 STUB_FUNC1(pthread_mutex_unlock, PJT_MUTEX_UNLOCK, int, void *)
 234 STUB_FUNC1(pthread_mutex_consistent, PJT_MUTEX_CONSISTENT, int, void *)
 235 STUB_FUNC1(pthread_mutexattr_destroy, PJT_MUTEXATTR_DESTROY, int, void *)
 236 STUB_FUNC1(pthread_mutexattr_init, PJT_MUTEXATTR_INIT, int, void *)
 237 STUB_FUNC2(pthread_mutexattr_settype, PJT_MUTEXATTR_SETTYPE, int, void *, int)
 238 STUB_FUNC2(pthread_mutexattr_getrobust, PJT_MUTEXATTR_GETROBUST, int, void *,
 239     int *)
 240 STUB_FUNC2(pthread_mutexattr_setrobust, PJT_MUTEXATTR_SETROBUST, int, void *,
 241     int)
 242 STUB_FUNC2(pthread_once,        PJT_ONCE, int, void *, void *)
 243 STUB_FUNC1(pthread_rwlock_destroy, PJT_RWLOCK_DESTROY, int, void *)
 244 STUB_FUNC2(pthread_rwlock_init, PJT_RWLOCK_INIT, int, void *, void *)
 245 STUB_FUNC1(pthread_rwlock_rdlock, PJT_RWLOCK_RDLOCK, int, void *)
 246 STUB_FUNC1(pthread_rwlock_tryrdlock, PJT_RWLOCK_TRYRDLOCK, int, void *)
 247 STUB_FUNC1(pthread_rwlock_trywrlock, PJT_RWLOCK_TRYWRLOCK, int, void *)
 248 STUB_FUNC1(pthread_rwlock_unlock, PJT_RWLOCK_UNLOCK, int, void *)
 249 STUB_FUNC1(pthread_rwlock_wrlock, PJT_RWLOCK_WRLOCK, int, void *)
 250 STUB_FUNC(pthread_self,         PJT_SELF, pthread_t)
 251 STUB_FUNC2(pthread_setspecific, PJT_SETSPECIFIC, int, pthread_key_t, void *)
 252 STUB_FUNC3(pthread_sigmask, PJT_SIGMASK, int, int, void *, void *)
 253 STUB_FUNC3(pthread_atfork, PJT_ATFORK, int, void *, void *, void*)
 254 STUB_FUNC1(pthread_attr_destroy, PJT_ATTR_DESTROY, int, void *);
 255 STUB_FUNC2(pthread_attr_getdetachstate, PJT_ATTR_GETDETACHSTATE, int, void *, void *)
 256 STUB_FUNC2(pthread_attr_getguardsize, PJT_ATTR_GETGUARDSIZE, int, void *, void *)
 257 STUB_FUNC2(pthread_attr_getstackaddr, PJT_ATTR_GETSTACKADDR, int, void *, void *)
 258 STUB_FUNC2(pthread_attr_getstacksize, PJT_ATTR_GETSTACKSIZE, int, void *, void *)
 259 STUB_FUNC2(pthread_attr_getinheritsched, PJT_ATTR_GETINHERITSCHED, int, void *, void *)
 260 STUB_FUNC2(pthread_attr_getschedparam, PJT_ATTR_GETSCHEDPARAM, int, void *, void *)
 261 STUB_FUNC2(pthread_attr_getschedpolicy, PJT_ATTR_GETSCHEDPOLICY, int, void *, void *)
 262 STUB_FUNC2(pthread_attr_getscope, PJT_ATTR_GETSCOPE, int, void *, void *)
 263 STUB_FUNC1(pthread_attr_init, PJT_ATTR_INIT, int, void *)
 264 STUB_FUNC2(pthread_attr_setdetachstate, PJT_ATTR_SETDETACHSTATE, int, void *, int)
 265 STUB_FUNC2(pthread_attr_setguardsize, PJT_ATTR_SETGUARDSIZE, int, void *, size_t)
 266 STUB_FUNC2(pthread_attr_setstackaddr, PJT_ATTR_SETSTACKADDR, int, void *, void *)
 267 STUB_FUNC2(pthread_attr_setstacksize, PJT_ATTR_SETSTACKSIZE, int, void *, size_t)
 268 STUB_FUNC2(pthread_attr_setinheritsched, PJT_ATTR_SETINHERITSCHED, int, void *, int)
 269 STUB_FUNC2(pthread_attr_setschedparam, PJT_ATTR_SETSCHEDPARAM, int, void *, void *)
 270 STUB_FUNC2(pthread_attr_setschedpolicy, PJT_ATTR_SETSCHEDPOLICY, int, void *, int)
 271 STUB_FUNC2(pthread_attr_setscope, PJT_ATTR_SETSCOPE, int, void *, int)
 272 STUB_FUNC1(pthread_cancel, PJT_CANCEL, int, void *)
 273 STUB_FUNC1(pthread_cleanup_pop, PJT_CLEANUP_POP, int, int)
 274 STUB_FUNC2(pthread_cleanup_push, PJT_CLEANUP_PUSH, void, void *, void *)
 275 STUB_FUNC3(pthread_cond_timedwait, PJT_COND_TIMEDWAIT, int, void *, void *, void *)
 276 STUB_FUNC1(pthread_detach, PJT_DETACH, int, void *)
 277 STUB_FUNC2(pthread_equal, PJT_EQUAL, int, void *, void *)
 278 STUB_FUNC1(pthread_exit, PJT_EXIT, void, void *)
 279 STUB_FUNC2(pthread_join, PJT_JOIN, int, void *, void *)
 280 STUB_FUNC2(pthread_kill, PJT_KILL, int, void *, int)
 281 STUB_FUNC2(pthread_setcancelstate, PJT_SETCANCELSTATE, int, int, void *)
 282 STUB_FUNC2(pthread_setcanceltype, PJT_SETCANCELTYPE, int, int, void *)
 283 STUB_FUNC(pthread_testcancel, PJT_TESTCANCEL, void)
 284 STUB_FUNC1(__pthread_cleanup_pop_imp, PJT_CLEANUP_POP_IMP, void, int)
 285 STUB_FUNC3(__pthread_cleanup_push_imp, PJT_CLEANUP_PUSH_IMP, void, void *,
 286     void *, void *);
 287 STUB_FUNC1(_pthread_cancel_enter, PJT_CANCEL_ENTER, void, int)
 288 STUB_FUNC1(_pthread_cancel_leave, PJT_CANCEL_LEAVE, void, int)
 289
 290 static int
 291 stub_zero(void)
 292 {
 293         return (0);
 294 }
 295
 296 static void *
 297 stub_null(void)
 298 {
 299         return (NULL);
 300 }
 301
 302 static struct pthread *
 303 stub_self(void)
 304 {
 305         return (&main_thread);
 306 }
 307
 308 static int
 309 stub_fail(void)
 310 {
 311         return (ENOSYS);
 312 }
 313
 314 static int
 315 stub_main(void)
 316 {
 317         return (-1);
 318 }
 319
 320 static int
 321 stub_true(void)
 322 {
 323         return (1);
 324 }
 325
 326 static void
 327 stub_exit(void)
 328 {
 329         exit(0);
 330 }