libsanitizer/tsan/tsan_interceptors.cc

   1 //===-- tsan_interceptors.cc ----------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is a part of ThreadSanitizer (TSan), a race detector.
   9 //
  10 // FIXME: move as many interceptors as possible into
  11 // sanitizer_common/sanitizer_common_interceptors.h
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "sanitizer_common/sanitizer_atomic.h"
  15 #include "sanitizer_common/sanitizer_libc.h"
  16 #include "sanitizer_common/sanitizer_placement_new.h"
  17 #include "sanitizer_common/sanitizer_stacktrace.h"
  18 #include "interception/interception.h"
  19 #include "tsan_interface.h"
  20 #include "tsan_platform.h"
  21 #include "tsan_rtl.h"
  22 #include "tsan_mman.h"
  23 #include "tsan_fd.h"
  24
  25 using namespace __tsan;  // NOLINT
  26
  27 const int kSigCount = 128;
  28
  29 struct my_siginfo_t {
  30   int opaque[128];
  31 };
  32
  33 struct sigset_t {
  34   u64 val[1024 / 8 / sizeof(u64)];
  35 };
  36
  37 struct ucontext_t {
  38   uptr opaque[117];
  39 };
  40
  41 extern "C" int pthread_attr_init(void *attr);
  42 extern "C" int pthread_attr_destroy(void *attr);
  43 extern "C" int pthread_attr_getdetachstate(void *attr, int *v);
  44 extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
  45 extern "C" int pthread_attr_getstacksize(void *attr, uptr *stacksize);
  46 extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
  47 extern "C" int pthread_setspecific(unsigned key, const void *v);
  48 extern "C" int pthread_mutexattr_gettype(void *a, int *type);
  49 extern "C" int pthread_yield();
  50 extern "C" int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);
  51 extern "C" int sigfillset(sigset_t *set);
  52 extern "C" void *pthread_self();
  53 extern "C" void _exit(int status);
  54 extern "C" int *__errno_location();
  55 extern "C" int fileno_unlocked(void *stream);
  56 extern "C" void *__libc_malloc(uptr size);
  57 extern "C" void *__libc_calloc(uptr size, uptr n);
  58 extern "C" void *__libc_realloc(void *ptr, uptr size);
  59 extern "C" void __libc_free(void *ptr);
  60 const int PTHREAD_MUTEX_RECURSIVE = 1;
  61 const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
  62 const int kPthreadAttrSize = 56;
  63 const int EINVAL = 22;
  64 const int EBUSY = 16;
  65 const int EPOLL_CTL_ADD = 1;
  66 const int SIGILL = 4;
  67 const int SIGABRT = 6;
  68 const int SIGFPE = 8;
  69 const int SIGSEGV = 11;
  70 const int SIGPIPE = 13;
  71 const int SIGBUS = 7;
  72 void *const MAP_FAILED = (void*)-1;
  73 const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
  74 const int MAP_FIXED = 0x10;
  75 typedef long long_t;  // NOLINT
  76
  77 // From /usr/include/unistd.h
  78 # define F_ULOCK 0      /* Unlock a previously locked region.  */
  79 # define F_LOCK  1      /* Lock a region for exclusive use.  */
  80 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
  81 # define F_TEST  3      /* Test a region for other processes locks.  */
  82
  83 typedef void (*sighandler_t)(int sig);
  84
  85 #define errno (*__errno_location())
  86
  87 union pthread_attr_t {
  88   char size[kPthreadAttrSize];
  89   void *align;
  90 };
  91
  92 struct sigaction_t {
  93   union {
  94     sighandler_t sa_handler;
  95     void (*sa_sigaction)(int sig, my_siginfo_t *siginfo, void *uctx);
  96   };
  97   sigset_t sa_mask;
  98   int sa_flags;
  99   void (*sa_restorer)();
 100 };
 101
 102 const sighandler_t SIG_DFL = (sighandler_t)0;
 103 const sighandler_t SIG_IGN = (sighandler_t)1;
 104 const sighandler_t SIG_ERR = (sighandler_t)-1;
 105 const int SA_SIGINFO = 4;
 106 const int SIG_SETMASK = 2;
 107
 108 namespace std {
 109 struct nothrow_t {};
 110 }  // namespace std
 111
 112 static sigaction_t sigactions[kSigCount];
 113
 114 namespace __tsan {
 115 struct SignalDesc {
 116   bool armed;
 117   bool sigaction;
 118   my_siginfo_t siginfo;
 119   ucontext_t ctx;
 120 };
 121
 122 struct SignalContext {
 123   int in_blocking_func;
 124   int int_signal_send;
 125   int pending_signal_count;
 126   SignalDesc pending_signals[kSigCount];
 127 };
 128 }  // namespace __tsan
 129
 130 static SignalContext *SigCtx(ThreadState *thr) {
 131   SignalContext *ctx = (SignalContext*)thr->signal_ctx;
 132   if (ctx == 0 && thr->is_alive) {
 133     ScopedInRtl in_rtl;
 134     ctx = (SignalContext*)MmapOrDie(sizeof(*ctx), "SignalContext");
 135     MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
 136     thr->signal_ctx = ctx;
 137   }
 138   return ctx;
 139 }
 140
 141 static unsigned g_thread_finalize_key;
 142
 143 class ScopedInterceptor {
 144  public:
 145   ScopedInterceptor(ThreadState *thr, const char *fname, uptr pc);
 146   ~ScopedInterceptor();
 147  private:
 148   ThreadState *const thr_;
 149   const int in_rtl_;
 150 };
 151
 152 ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
 153                                      uptr pc)
 154     : thr_(thr)
 155     , in_rtl_(thr->in_rtl) {
 156   if (thr_->in_rtl == 0) {
 157     Initialize(thr);
 158     FuncEntry(thr, pc);
 159     thr_->in_rtl++;
 160     DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
 161   } else {
 162     thr_->in_rtl++;
 163   }
 164 }
 165
 166 ScopedInterceptor::~ScopedInterceptor() {
 167   thr_->in_rtl--;
 168   if (thr_->in_rtl == 0) {
 169     FuncExit(thr_);
 170     ProcessPendingSignals(thr_);
 171   }
 172   CHECK_EQ(in_rtl_, thr_->in_rtl);
 173 }
 174
 175 #define SCOPED_INTERCEPTOR_RAW(func, ...) \
 176     ThreadState *thr = cur_thread(); \
 177     StatInc(thr, StatInterceptor); \
 178     StatInc(thr, StatInt_##func); \
 179     const uptr caller_pc = GET_CALLER_PC(); \
 180     ScopedInterceptor si(thr, #func, caller_pc); \
 181     const uptr pc = __sanitizer::StackTrace::GetPreviousInstructionPc( \
 182         __sanitizer::StackTrace::GetCurrentPc()); \
 183     (void)pc; \
 184 /**/
 185
 186 #define SCOPED_TSAN_INTERCEPTOR(func, ...) \
 187     SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
 188     if (REAL(func) == 0) { \
 189       Printf("FATAL: ThreadSanitizer: failed to intercept %s\n", #func); \
 190       Die(); \
 191     } \
 192     if (thr->in_rtl > 1) \
 193       return REAL(func)(__VA_ARGS__); \
 194 /**/
 195
 196 #define TSAN_INTERCEPTOR(ret, func, ...) INTERCEPTOR(ret, func, __VA_ARGS__)
 197 #define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
 198
 199 #define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
 200
 201 struct BlockingCall {
 202   explicit BlockingCall(ThreadState *thr)
 203       : ctx(SigCtx(thr)) {
 204     ctx->in_blocking_func++;
 205   }
 206
 207   ~BlockingCall() {
 208     ctx->in_blocking_func--;
 209   }
 210
 211   SignalContext *ctx;
 212 };
 213
 214 TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
 215   SCOPED_TSAN_INTERCEPTOR(sleep, sec);
 216   unsigned res = BLOCK_REAL(sleep)(sec);
 217   AfterSleep(thr, pc);
 218   return res;
 219 }
 220
 221 TSAN_INTERCEPTOR(int, usleep, long_t usec) {
 222   SCOPED_TSAN_INTERCEPTOR(usleep, usec);
 223   int res = BLOCK_REAL(usleep)(usec);
 224   AfterSleep(thr, pc);
 225   return res;
 226 }
 227
 228 TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
 229   SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
 230   int res = BLOCK_REAL(nanosleep)(req, rem);
 231   AfterSleep(thr, pc);
 232   return res;
 233 }
 234
 235 class AtExitContext {
 236  public:
 237   AtExitContext()
 238     : mtx_(MutexTypeAtExit, StatMtxAtExit)
 239     , pos_() {
 240   }
 241
 242   typedef void(*atexit_t)();
 243
 244   int atexit(ThreadState *thr, uptr pc, bool is_on_exit,
 245              atexit_t f, void *arg) {
 246     Lock l(&mtx_);
 247     if (pos_ == kMaxAtExit)
 248       return 1;
 249     Release(thr, pc, (uptr)this);
 250     stack_[pos_] = f;
 251     args_[pos_] = arg;
 252     is_on_exits_[pos_] = is_on_exit;
 253     pos_++;
 254     return 0;
 255   }
 256
 257   void exit(ThreadState *thr, uptr pc) {
 258     CHECK_EQ(thr->in_rtl, 0);
 259     for (;;) {
 260       atexit_t f = 0;
 261       void *arg = 0;
 262       bool is_on_exit = false;
 263       {
 264         Lock l(&mtx_);
 265         if (pos_) {
 266           pos_--;
 267           f = stack_[pos_];
 268           arg = args_[pos_];
 269           is_on_exit = is_on_exits_[pos_];
 270           ScopedInRtl in_rtl;
 271           Acquire(thr, pc, (uptr)this);
 272         }
 273       }
 274       if (f == 0)
 275         break;
 276       DPrintf("#%d: executing atexit func %p\n", thr->tid, f);
 277       CHECK_EQ(thr->in_rtl, 0);
 278       if (is_on_exit)
 279         ((void(*)(int status, void *arg))f)(0, arg);
 280       else
 281         ((void(*)(void *arg, void *dso))f)(arg, 0);
 282     }
 283   }
 284
 285  private:
 286   static const int kMaxAtExit = 128;
 287   Mutex mtx_;
 288   atexit_t stack_[kMaxAtExit];
 289   void *args_[kMaxAtExit];
 290   bool is_on_exits_[kMaxAtExit];
 291   int pos_;
 292 };
 293
 294 static AtExitContext *atexit_ctx;
 295
 296 static void finalize(void *arg) {
 297   ThreadState * thr = cur_thread();
 298   uptr pc = 0;
 299   atexit_ctx->exit(thr, pc);
 300   int status = Finalize(cur_thread());
 301   if (status)
 302     _exit(status);
 303 }
 304
 305 TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
 306   if (cur_thread()->in_symbolizer)
 307     return 0;
 308   SCOPED_TSAN_INTERCEPTOR(atexit, f);
 309   return atexit_ctx->atexit(thr, pc, false, (void(*)())f, 0);
 310 }
 311
 312 TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
 313   if (cur_thread()->in_symbolizer)
 314     return 0;
 315   SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
 316   return atexit_ctx->atexit(thr, pc, true, (void(*)())f, arg);
 317 }
 318
 319 TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {
 320   if (cur_thread()->in_symbolizer)
 321     return 0;
 322   SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
 323   if (dso)
 324     return REAL(__cxa_atexit)(f, arg, dso);
 325   return atexit_ctx->atexit(thr, pc, false, (void(*)())f, arg);
 326 }
 327
 328 TSAN_INTERCEPTOR(void, longjmp, void *env, int val) {
 329   SCOPED_TSAN_INTERCEPTOR(longjmp, env, val);
 330   Printf("ThreadSanitizer: longjmp() is not supported\n");
 331   Die();
 332 }
 333
 334 TSAN_INTERCEPTOR(void, siglongjmp, void *env, int val) {
 335   SCOPED_TSAN_INTERCEPTOR(siglongjmp, env, val);
 336   Printf("ThreadSanitizer: siglongjmp() is not supported\n");
 337   Die();
 338 }
 339
 340 TSAN_INTERCEPTOR(void*, malloc, uptr size) {
 341   if (cur_thread()->in_symbolizer)
 342     return __libc_malloc(size);
 343   void *p = 0;
 344   {
 345     SCOPED_INTERCEPTOR_RAW(malloc, size);
 346     p = user_alloc(thr, pc, size);
 347   }
 348   invoke_malloc_hook(p, size);
 349   return p;
 350 }
 351
 352 TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
 353   SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
 354   return user_alloc(thr, pc, sz, align);
 355 }
 356
 357 TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
 358   if (cur_thread()->in_symbolizer)
 359     return __libc_calloc(size, n);
 360   if (__sanitizer::CallocShouldReturnNullDueToOverflow(size, n)) return 0;
 361   void *p = 0;
 362   {
 363     SCOPED_INTERCEPTOR_RAW(calloc, size, n);
 364     p = user_alloc(thr, pc, n * size);
 365     if (p) internal_memset(p, 0, n * size);
 366   }
 367   invoke_malloc_hook(p, n * size);
 368   return p;
 369 }
 370
 371 TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
 372   if (cur_thread()->in_symbolizer)
 373     return __libc_realloc(p, size);
 374   if (p)
 375     invoke_free_hook(p);
 376   {
 377     SCOPED_INTERCEPTOR_RAW(realloc, p, size);
 378     p = user_realloc(thr, pc, p, size);
 379   }
 380   invoke_malloc_hook(p, size);
 381   return p;
 382 }
 383
 384 TSAN_INTERCEPTOR(void, free, void *p) {
 385   if (p == 0)
 386     return;
 387   if (cur_thread()->in_symbolizer)
 388     return __libc_free(p);
 389   invoke_free_hook(p);
 390   SCOPED_INTERCEPTOR_RAW(free, p);
 391   user_free(thr, pc, p);
 392 }
 393
 394 TSAN_INTERCEPTOR(void, cfree, void *p) {
 395   if (p == 0)
 396     return;
 397   if (cur_thread()->in_symbolizer)
 398     return __libc_free(p);
 399   invoke_free_hook(p);
 400   SCOPED_INTERCEPTOR_RAW(cfree, p);
 401   user_free(thr, pc, p);
 402 }
 403
 404 #define OPERATOR_NEW_BODY(mangled_name) \
 405   if (cur_thread()->in_symbolizer) \
 406     return __libc_malloc(size); \
 407   void *p = 0; \
 408   {  \
 409     SCOPED_INTERCEPTOR_RAW(mangled_name, size); \
 410     p = user_alloc(thr, pc, size); \
 411   }  \
 412   invoke_malloc_hook(p, size);  \
 413   return p;
 414
 415 void *operator new(__sanitizer::uptr size) {
 416   OPERATOR_NEW_BODY(_Znwm);
 417 }
 418 void *operator new[](__sanitizer::uptr size) {
 419   OPERATOR_NEW_BODY(_Znam);
 420 }
 421 void *operator new(__sanitizer::uptr size, std::nothrow_t const&) {
 422   OPERATOR_NEW_BODY(_ZnwmRKSt9nothrow_t);
 423 }
 424 void *operator new[](__sanitizer::uptr size, std::nothrow_t const&) {
 425   OPERATOR_NEW_BODY(_ZnamRKSt9nothrow_t);
 426 }
 427
 428 #define OPERATOR_DELETE_BODY(mangled_name) \
 429   if (ptr == 0) return;  \
 430   if (cur_thread()->in_symbolizer) \
 431     return __libc_free(ptr); \
 432   invoke_free_hook(ptr);  \
 433   SCOPED_INTERCEPTOR_RAW(mangled_name, ptr);  \
 434   user_free(thr, pc, ptr);
 435
 436 void operator delete(void *ptr) {
 437   OPERATOR_DELETE_BODY(_ZdlPv);
 438 }
 439 void operator delete[](void *ptr) {
 440   OPERATOR_DELETE_BODY(_ZdlPvRKSt9nothrow_t);
 441 }
 442 void operator delete(void *ptr, std::nothrow_t const&) {
 443   OPERATOR_DELETE_BODY(_ZdaPv);
 444 }
 445 void operator delete[](void *ptr, std::nothrow_t const&) {
 446   OPERATOR_DELETE_BODY(_ZdaPvRKSt9nothrow_t);
 447 }
 448
 449 TSAN_INTERCEPTOR(uptr, strlen, const char *s) {
 450   SCOPED_TSAN_INTERCEPTOR(strlen, s);
 451   uptr len = internal_strlen(s);
 452   MemoryAccessRange(thr, pc, (uptr)s, len + 1, false);
 453   return len;
 454 }
 455
 456 TSAN_INTERCEPTOR(void*, memset, void *dst, int v, uptr size) {
 457   SCOPED_TSAN_INTERCEPTOR(memset, dst, v, size);
 458   MemoryAccessRange(thr, pc, (uptr)dst, size, true);
 459   return internal_memset(dst, v, size);
 460 }
 461
 462 TSAN_INTERCEPTOR(void*, memcpy, void *dst, const void *src, uptr size) {
 463   SCOPED_TSAN_INTERCEPTOR(memcpy, dst, src, size);
 464   MemoryAccessRange(thr, pc, (uptr)dst, size, true);
 465   MemoryAccessRange(thr, pc, (uptr)src, size, false);
 466   return internal_memcpy(dst, src, size);
 467 }
 468
 469 TSAN_INTERCEPTOR(int, memcmp, const void *s1, const void *s2, uptr n) {
 470   SCOPED_TSAN_INTERCEPTOR(memcmp, s1, s2, n);
 471   int res = 0;
 472   uptr len = 0;
 473   for (; len < n; len++) {
 474     if ((res = ((unsigned char*)s1)[len] - ((unsigned char*)s2)[len]))
 475       break;
 476   }
 477   MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
 478   MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
 479   return res;
 480 }
 481
 482 TSAN_INTERCEPTOR(int, strcmp, const char *s1, const char *s2) {
 483   SCOPED_TSAN_INTERCEPTOR(strcmp, s1, s2);
 484   uptr len = 0;
 485   for (; s1[len] && s2[len]; len++) {
 486     if (s1[len] != s2[len])
 487       break;
 488   }
 489   MemoryAccessRange(thr, pc, (uptr)s1, len + 1, false);
 490   MemoryAccessRange(thr, pc, (uptr)s2, len + 1, false);
 491   return s1[len] - s2[len];
 492 }
 493
 494 TSAN_INTERCEPTOR(int, strncmp, const char *s1, const char *s2, uptr n) {
 495   SCOPED_TSAN_INTERCEPTOR(strncmp, s1, s2, n);
 496   uptr len = 0;
 497   for (; len < n && s1[len] && s2[len]; len++) {
 498     if (s1[len] != s2[len])
 499       break;
 500   }
 501   MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
 502   MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
 503   return len == n ? 0 : s1[len] - s2[len];
 504 }
 505
 506 TSAN_INTERCEPTOR(void*, memchr, void *s, int c, uptr n) {
 507   SCOPED_TSAN_INTERCEPTOR(memchr, s, c, n);
 508   void *res = REAL(memchr)(s, c, n);
 509   uptr len = res ? (char*)res - (char*)s + 1 : n;
 510   MemoryAccessRange(thr, pc, (uptr)s, len, false);
 511   return res;
 512 }
 513
 514 TSAN_INTERCEPTOR(void*, memrchr, char *s, int c, uptr n) {
 515   SCOPED_TSAN_INTERCEPTOR(memrchr, s, c, n);
 516   MemoryAccessRange(thr, pc, (uptr)s, n, false);
 517   return REAL(memrchr)(s, c, n);
 518 }
 519
 520 TSAN_INTERCEPTOR(void*, memmove, void *dst, void *src, uptr n) {
 521   SCOPED_TSAN_INTERCEPTOR(memmove, dst, src, n);
 522   MemoryAccessRange(thr, pc, (uptr)dst, n, true);
 523   MemoryAccessRange(thr, pc, (uptr)src, n, false);
 524   return REAL(memmove)(dst, src, n);
 525 }
 526
 527 TSAN_INTERCEPTOR(char*, strchr, char *s, int c) {
 528   SCOPED_TSAN_INTERCEPTOR(strchr, s, c);
 529   char *res = REAL(strchr)(s, c);
 530   uptr len = res ? (char*)res - (char*)s + 1 : internal_strlen(s) + 1;
 531   MemoryAccessRange(thr, pc, (uptr)s, len, false);
 532   return res;
 533 }
 534
 535 TSAN_INTERCEPTOR(char*, strchrnul, char *s, int c) {
 536   SCOPED_TSAN_INTERCEPTOR(strchrnul, s, c);
 537   char *res = REAL(strchrnul)(s, c);
 538   uptr len = (char*)res - (char*)s + 1;
 539   MemoryAccessRange(thr, pc, (uptr)s, len, false);
 540   return res;
 541 }
 542
 543 TSAN_INTERCEPTOR(char*, strrchr, char *s, int c) {
 544   SCOPED_TSAN_INTERCEPTOR(strrchr, s, c);
 545   MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s) + 1, false);
 546   return REAL(strrchr)(s, c);
 547 }
 548
 549 TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) {  // NOLINT
 550   SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);  // NOLINT
 551   uptr srclen = internal_strlen(src);
 552   MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
 553   MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
 554   return REAL(strcpy)(dst, src);  // NOLINT
 555 }
 556
 557 TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
 558   SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
 559   uptr srclen = internal_strnlen(src, n);
 560   MemoryAccessRange(thr, pc, (uptr)dst, n, true);
 561   MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
 562   return REAL(strncpy)(dst, src, n);
 563 }
 564
 565 TSAN_INTERCEPTOR(const char*, strstr, const char *s1, const char *s2) {
 566   SCOPED_TSAN_INTERCEPTOR(strstr, s1, s2);
 567   const char *res = REAL(strstr)(s1, s2);
 568   uptr len1 = internal_strlen(s1);
 569   uptr len2 = internal_strlen(s2);
 570   MemoryAccessRange(thr, pc, (uptr)s1, len1 + 1, false);
 571   MemoryAccessRange(thr, pc, (uptr)s2, len2 + 1, false);
 572   return res;
 573 }
 574
 575 static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
 576   if (*addr) {
 577     if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
 578       if (flags & MAP_FIXED) {
 579         errno = EINVAL;
 580         return false;
 581       } else {
 582         *addr = 0;
 583       }
 584     }
 585   }
 586   return true;
 587 }
 588
 589 TSAN_INTERCEPTOR(void*, mmap, void *addr, long_t sz, int prot,
 590                          int flags, int fd, unsigned off) {
 591   SCOPED_TSAN_INTERCEPTOR(mmap, addr, sz, prot, flags, fd, off);
 592   if (!fix_mmap_addr(&addr, sz, flags))
 593     return MAP_FAILED;
 594   void *res = REAL(mmap)(addr, sz, prot, flags, fd, off);
 595   if (res != MAP_FAILED) {
 596     if (fd > 0)
 597       FdAccess(thr, pc, fd);
 598     MemoryResetRange(thr, pc, (uptr)res, sz);
 599   }
 600   return res;
 601 }
 602
 603 TSAN_INTERCEPTOR(void*, mmap64, void *addr, long_t sz, int prot,
 604                            int flags, int fd, u64 off) {
 605   SCOPED_TSAN_INTERCEPTOR(mmap64, addr, sz, prot, flags, fd, off);
 606   if (!fix_mmap_addr(&addr, sz, flags))
 607     return MAP_FAILED;
 608   void *res = REAL(mmap64)(addr, sz, prot, flags, fd, off);
 609   if (res != MAP_FAILED) {
 610     if (fd > 0)
 611       FdAccess(thr, pc, fd);
 612     MemoryResetRange(thr, pc, (uptr)res, sz);
 613   }
 614   return res;
 615 }
 616
 617 TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
 618   SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
 619   int res = REAL(munmap)(addr, sz);
 620   return res;
 621 }
 622
 623 TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
 624   SCOPED_TSAN_INTERCEPTOR(memalign, align, sz);
 625   return user_alloc(thr, pc, sz, align);
 626 }
 627
 628 TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
 629   SCOPED_TSAN_INTERCEPTOR(valloc, sz);
 630   return user_alloc(thr, pc, sz, GetPageSizeCached());
 631 }
 632
 633 TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
 634   SCOPED_TSAN_INTERCEPTOR(pvalloc, sz);
 635   sz = RoundUp(sz, GetPageSizeCached());
 636   return user_alloc(thr, pc, sz, GetPageSizeCached());
 637 }
 638
 639 TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
 640   SCOPED_TSAN_INTERCEPTOR(posix_memalign, memptr, align, sz);
 641   *memptr = user_alloc(thr, pc, sz, align);
 642   return 0;
 643 }
 644
 645 // Used in thread-safe function static initialization.
 646 extern "C" int INTERFACE_ATTRIBUTE __cxa_guard_acquire(atomic_uint32_t *g) {
 647   SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
 648   for (;;) {
 649     u32 cmp = atomic_load(g, memory_order_acquire);
 650     if (cmp == 0) {
 651       if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
 652         return 1;
 653     } else if (cmp == 1) {
 654       Acquire(thr, pc, (uptr)g);
 655       return 0;
 656     } else {
 657       internal_sched_yield();
 658     }
 659   }
 660 }
 661
 662 extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_release(atomic_uint32_t *g) {
 663   SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
 664   Release(thr, pc, (uptr)g);
 665   atomic_store(g, 1, memory_order_release);
 666 }
 667
 668 extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_abort(atomic_uint32_t *g) {
 669   SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
 670   atomic_store(g, 0, memory_order_relaxed);
 671 }
 672
 673 static void thread_finalize(void *v) {
 674   uptr iter = (uptr)v;
 675   if (iter > 1) {
 676     if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
 677       Printf("ThreadSanitizer: failed to set thread key\n");
 678       Die();
 679     }
 680     return;
 681   }
 682   {
 683     ScopedInRtl in_rtl;
 684     ThreadState *thr = cur_thread();
 685     ThreadFinish(thr);
 686     SignalContext *sctx = thr->signal_ctx;
 687     if (sctx) {
 688       thr->signal_ctx = 0;
 689       UnmapOrDie(sctx, sizeof(*sctx));
 690     }
 691   }
 692 }
 693
 694
 695 struct ThreadParam {
 696   void* (*callback)(void *arg);
 697   void *param;
 698   atomic_uintptr_t tid;
 699 };
 700
 701 extern "C" void *__tsan_thread_start_func(void *arg) {
 702   ThreadParam *p = (ThreadParam*)arg;
 703   void* (*callback)(void *arg) = p->callback;
 704   void *param = p->param;
 705   int tid = 0;
 706   {
 707     ThreadState *thr = cur_thread();
 708     ScopedInRtl in_rtl;
 709     if (pthread_setspecific(g_thread_finalize_key, (void*)4)) {
 710       Printf("ThreadSanitizer: failed to set thread key\n");
 711       Die();
 712     }
 713     while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
 714       pthread_yield();
 715     atomic_store(&p->tid, 0, memory_order_release);
 716     ThreadStart(thr, tid, GetTid());
 717     CHECK_EQ(thr->in_rtl, 1);
 718   }
 719   void *res = callback(param);
 720   // Prevent the callback from being tail called,
 721   // it mixes up stack traces.
 722   volatile int foo = 42;
 723   foo++;
 724   return res;
 725 }
 726
 727 TSAN_INTERCEPTOR(int, pthread_create,
 728     void *th, void *attr, void *(*callback)(void*), void * param) {
 729   SCOPED_TSAN_INTERCEPTOR(pthread_create, th, attr, callback, param);
 730   pthread_attr_t myattr;
 731   if (attr == 0) {
 732     pthread_attr_init(&myattr);
 733     attr = &myattr;
 734   }
 735   int detached = 0;
 736   pthread_attr_getdetachstate(attr, &detached);
 737   uptr stacksize = 0;
 738   pthread_attr_getstacksize(attr, &stacksize);
 739   // We place the huge ThreadState object into TLS, account for that.
 740   const uptr minstacksize = GetTlsSize() + 128*1024;
 741   if (stacksize < minstacksize) {
 742     DPrintf("ThreadSanitizer: stacksize %zu->%zu\n", stacksize, minstacksize);
 743     pthread_attr_setstacksize(attr, minstacksize);
 744   }
 745   ThreadParam p;
 746   p.callback = callback;
 747   p.param = param;
 748   atomic_store(&p.tid, 0, memory_order_relaxed);
 749   int res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
 750   if (res == 0) {
 751     int tid = ThreadCreate(thr, pc, *(uptr*)th, detached);
 752     CHECK_NE(tid, 0);
 753     atomic_store(&p.tid, tid, memory_order_release);
 754     while (atomic_load(&p.tid, memory_order_acquire) != 0)
 755       pthread_yield();
 756   }
 757   if (attr == &myattr)
 758     pthread_attr_destroy(&myattr);
 759   return res;
 760 }
 761
 762 TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
 763   SCOPED_TSAN_INTERCEPTOR(pthread_join, th, ret);
 764   int tid = ThreadTid(thr, pc, (uptr)th);
 765   int res = BLOCK_REAL(pthread_join)(th, ret);
 766   if (res == 0) {
 767     ThreadJoin(thr, pc, tid);
 768   }
 769   return res;
 770 }
 771
 772 TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
 773   SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
 774   int tid = ThreadTid(thr, pc, (uptr)th);
 775   int res = REAL(pthread_detach)(th);
 776   if (res == 0) {
 777     ThreadDetach(thr, pc, tid);
 778   }
 779   return res;
 780 }
 781
 782 TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
 783   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
 784   int res = REAL(pthread_mutex_init)(m, a);
 785   if (res == 0) {
 786     bool recursive = false;
 787     if (a) {
 788       int type = 0;
 789       if (pthread_mutexattr_gettype(a, &type) == 0)
 790         recursive = (type == PTHREAD_MUTEX_RECURSIVE
 791             || type == PTHREAD_MUTEX_RECURSIVE_NP);
 792     }
 793     MutexCreate(thr, pc, (uptr)m, false, recursive, false);
 794   }
 795   return res;
 796 }
 797
 798 TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
 799   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
 800   int res = REAL(pthread_mutex_destroy)(m);
 801   if (res == 0 || res == EBUSY) {
 802     MutexDestroy(thr, pc, (uptr)m);
 803   }
 804   return res;
 805 }
 806
 807 TSAN_INTERCEPTOR(int, pthread_mutex_lock, void *m) {
 808   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_lock, m);
 809   int res = REAL(pthread_mutex_lock)(m);
 810   if (res == 0) {
 811     MutexLock(thr, pc, (uptr)m);
 812   }
 813   return res;
 814 }
 815
 816 TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
 817   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
 818   int res = REAL(pthread_mutex_trylock)(m);
 819   if (res == 0) {
 820     MutexLock(thr, pc, (uptr)m);
 821   }
 822   return res;
 823 }
 824
 825 TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
 826   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
 827   int res = REAL(pthread_mutex_timedlock)(m, abstime);
 828   if (res == 0) {
 829     MutexLock(thr, pc, (uptr)m);
 830   }
 831   return res;
 832 }
 833
 834 TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {
 835   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_unlock, m);
 836   MutexUnlock(thr, pc, (uptr)m);
 837   int res = REAL(pthread_mutex_unlock)(m);
 838   return res;
 839 }
 840
 841 TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
 842   SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
 843   int res = REAL(pthread_spin_init)(m, pshared);
 844   if (res == 0) {
 845     MutexCreate(thr, pc, (uptr)m, false, false, false);
 846   }
 847   return res;
 848 }
 849
 850 TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
 851   SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
 852   int res = REAL(pthread_spin_destroy)(m);
 853   if (res == 0) {
 854     MutexDestroy(thr, pc, (uptr)m);
 855   }
 856   return res;
 857 }
 858
 859 TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
 860   SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
 861   int res = REAL(pthread_spin_lock)(m);
 862   if (res == 0) {
 863     MutexLock(thr, pc, (uptr)m);
 864   }
 865   return res;
 866 }
 867
 868 TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
 869   SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
 870   int res = REAL(pthread_spin_trylock)(m);
 871   if (res == 0) {
 872     MutexLock(thr, pc, (uptr)m);
 873   }
 874   return res;
 875 }
 876
 877 TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
 878   SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
 879   MutexUnlock(thr, pc, (uptr)m);
 880   int res = REAL(pthread_spin_unlock)(m);
 881   return res;
 882 }
 883
 884 TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
 885   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
 886   int res = REAL(pthread_rwlock_init)(m, a);
 887   if (res == 0) {
 888     MutexCreate(thr, pc, (uptr)m, true, false, false);
 889   }
 890   return res;
 891 }
 892
 893 TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
 894   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
 895   int res = REAL(pthread_rwlock_destroy)(m);
 896   if (res == 0) {
 897     MutexDestroy(thr, pc, (uptr)m);
 898   }
 899   return res;
 900 }
 901
 902 TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
 903   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
 904   int res = REAL(pthread_rwlock_rdlock)(m);
 905   if (res == 0) {
 906     MutexReadLock(thr, pc, (uptr)m);
 907   }
 908   return res;
 909 }
 910
 911 TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
 912   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
 913   int res = REAL(pthread_rwlock_tryrdlock)(m);
 914   if (res == 0) {
 915     MutexReadLock(thr, pc, (uptr)m);
 916   }
 917   return res;
 918 }
 919
 920 TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
 921   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
 922   int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
 923   if (res == 0) {
 924     MutexReadLock(thr, pc, (uptr)m);
 925   }
 926   return res;
 927 }
 928
 929 TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
 930   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
 931   int res = REAL(pthread_rwlock_wrlock)(m);
 932   if (res == 0) {
 933     MutexLock(thr, pc, (uptr)m);
 934   }
 935   return res;
 936 }
 937
 938 TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
 939   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
 940   int res = REAL(pthread_rwlock_trywrlock)(m);
 941   if (res == 0) {
 942     MutexLock(thr, pc, (uptr)m);
 943   }
 944   return res;
 945 }
 946
 947 TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
 948   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
 949   int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
 950   if (res == 0) {
 951     MutexLock(thr, pc, (uptr)m);
 952   }
 953   return res;
 954 }
 955
 956 TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
 957   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
 958   MutexReadOrWriteUnlock(thr, pc, (uptr)m);
 959   int res = REAL(pthread_rwlock_unlock)(m);
 960   return res;
 961 }
 962
 963 // libpthread.so contains several versions of pthread_cond_init symbol.
 964 // When we just dlsym() it, we get the wrong (old) version.
 965 /*
 966 TSAN_INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
 967   SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, c, a);
 968   int res = REAL(pthread_cond_init)(c, a);
 969   return res;
 970 }
 971 */
 972
 973 TSAN_INTERCEPTOR(int, pthread_cond_destroy, void *c) {
 974   SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, c);
 975   int res = REAL(pthread_cond_destroy)(c);
 976   return res;
 977 }
 978
 979 TSAN_INTERCEPTOR(int, pthread_cond_signal, void *c) {
 980   SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, c);
 981   int res = REAL(pthread_cond_signal)(c);
 982   return res;
 983 }
 984
 985 TSAN_INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
 986   SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, c);
 987   int res = REAL(pthread_cond_broadcast)(c);
 988   return res;
 989 }
 990
 991 TSAN_INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
 992   SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, c, m);
 993   MutexUnlock(thr, pc, (uptr)m);
 994   int res = REAL(pthread_cond_wait)(c, m);
 995   MutexLock(thr, pc, (uptr)m);
 996   return res;
 997 }
 998
 999 TSAN_INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m, void *abstime) {
1000   SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, c, m, abstime);
1001   MutexUnlock(thr, pc, (uptr)m);
1002   int res = REAL(pthread_cond_timedwait)(c, m, abstime);
1003   MutexLock(thr, pc, (uptr)m);
1004   return res;
1005 }
1006
1007 TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1008   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1009   MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1010   int res = REAL(pthread_barrier_init)(b, a, count);
1011   return res;
1012 }
1013
1014 TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1015   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1016   MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1017   int res = REAL(pthread_barrier_destroy)(b);
1018   return res;
1019 }
1020
1021 TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1022   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1023   Release(thr, pc, (uptr)b);
1024   MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1025   int res = REAL(pthread_barrier_wait)(b);
1026   MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1027   if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1028     Acquire(thr, pc, (uptr)b);
1029   }
1030   return res;
1031 }
1032
1033 TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1034   SCOPED_TSAN_INTERCEPTOR(pthread_once, o, f);
1035   if (o == 0 || f == 0)
1036     return EINVAL;
1037   atomic_uint32_t *a = static_cast<atomic_uint32_t*>(o);
1038   u32 v = atomic_load(a, memory_order_acquire);
1039   if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1040                                                memory_order_relaxed)) {
1041     const int old_in_rtl = thr->in_rtl;
1042     thr->in_rtl = 0;
1043     (*f)();
1044     CHECK_EQ(thr->in_rtl, 0);
1045     thr->in_rtl = old_in_rtl;
1046     Release(thr, pc, (uptr)o);
1047     atomic_store(a, 2, memory_order_release);
1048   } else {
1049     while (v != 2) {
1050       pthread_yield();
1051       v = atomic_load(a, memory_order_acquire);
1052     }
1053     Acquire(thr, pc, (uptr)o);
1054   }
1055   return 0;
1056 }
1057
1058 TSAN_INTERCEPTOR(int, sem_init, void *s, int pshared, unsigned value) {
1059   SCOPED_TSAN_INTERCEPTOR(sem_init, s, pshared, value);
1060   int res = REAL(sem_init)(s, pshared, value);
1061   return res;
1062 }
1063
1064 TSAN_INTERCEPTOR(int, sem_destroy, void *s) {
1065   SCOPED_TSAN_INTERCEPTOR(sem_destroy, s);
1066   int res = REAL(sem_destroy)(s);
1067   return res;
1068 }
1069
1070 TSAN_INTERCEPTOR(int, sem_wait, void *s) {
1071   SCOPED_TSAN_INTERCEPTOR(sem_wait, s);
1072   int res = BLOCK_REAL(sem_wait)(s);
1073   if (res == 0) {
1074     Acquire(thr, pc, (uptr)s);
1075   }
1076   return res;
1077 }
1078
1079 TSAN_INTERCEPTOR(int, sem_trywait, void *s) {
1080   SCOPED_TSAN_INTERCEPTOR(sem_trywait, s);
1081   int res = BLOCK_REAL(sem_trywait)(s);
1082   if (res == 0) {
1083     Acquire(thr, pc, (uptr)s);
1084   }
1085   return res;
1086 }
1087
1088 TSAN_INTERCEPTOR(int, sem_timedwait, void *s, void *abstime) {
1089   SCOPED_TSAN_INTERCEPTOR(sem_timedwait, s, abstime);
1090   int res = BLOCK_REAL(sem_timedwait)(s, abstime);
1091   if (res == 0) {
1092     Acquire(thr, pc, (uptr)s);
1093   }
1094   return res;
1095 }
1096
1097 TSAN_INTERCEPTOR(int, sem_post, void *s) {
1098   SCOPED_TSAN_INTERCEPTOR(sem_post, s);
1099   Release(thr, pc, (uptr)s);
1100   int res = REAL(sem_post)(s);
1101   return res;
1102 }
1103
1104 TSAN_INTERCEPTOR(int, sem_getvalue, void *s, int *sval) {
1105   SCOPED_TSAN_INTERCEPTOR(sem_getvalue, s, sval);
1106   int res = REAL(sem_getvalue)(s, sval);
1107   if (res == 0) {
1108     Acquire(thr, pc, (uptr)s);
1109   }
1110   return res;
1111 }
1112
1113 TSAN_INTERCEPTOR(int, __xstat, int version, const char *path, void *buf) {
1114   SCOPED_TSAN_INTERCEPTOR(__xstat, version, path, buf);
1115   return REAL(__xstat)(version, path, buf);
1116 }
1117
1118 TSAN_INTERCEPTOR(int, stat, const char *path, void *buf) {
1119   SCOPED_TSAN_INTERCEPTOR(__xstat, 0, path, buf);
1120   return REAL(__xstat)(0, path, buf);
1121 }
1122
1123 TSAN_INTERCEPTOR(int, __xstat64, int version, const char *path, void *buf) {
1124   SCOPED_TSAN_INTERCEPTOR(__xstat64, version, path, buf);
1125   return REAL(__xstat64)(version, path, buf);
1126 }
1127
1128 TSAN_INTERCEPTOR(int, stat64, const char *path, void *buf) {
1129   SCOPED_TSAN_INTERCEPTOR(__xstat64, 0, path, buf);
1130   return REAL(__xstat64)(0, path, buf);
1131 }
1132
1133 TSAN_INTERCEPTOR(int, __lxstat, int version, const char *path, void *buf) {
1134   SCOPED_TSAN_INTERCEPTOR(__lxstat, version, path, buf);
1135   return REAL(__lxstat)(version, path, buf);
1136 }
1137
1138 TSAN_INTERCEPTOR(int, lstat, const char *path, void *buf) {
1139   SCOPED_TSAN_INTERCEPTOR(__lxstat, 0, path, buf);
1140   return REAL(__lxstat)(0, path, buf);
1141 }
1142
1143 TSAN_INTERCEPTOR(int, __lxstat64, int version, const char *path, void *buf) {
1144   SCOPED_TSAN_INTERCEPTOR(__lxstat64, version, path, buf);
1145   return REAL(__lxstat64)(version, path, buf);
1146 }
1147
1148 TSAN_INTERCEPTOR(int, lstat64, const char *path, void *buf) {
1149   SCOPED_TSAN_INTERCEPTOR(__lxstat64, 0, path, buf);
1150   return REAL(__lxstat64)(0, path, buf);
1151 }
1152
1153 TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1154   SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1155   if (fd > 0)
1156     FdAccess(thr, pc, fd);
1157   return REAL(__fxstat)(version, fd, buf);
1158 }
1159
1160 TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1161   SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
1162   if (fd > 0)
1163     FdAccess(thr, pc, fd);
1164   return REAL(__fxstat)(0, fd, buf);
1165 }
1166
1167 TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1168   SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1169   if (fd > 0)
1170     FdAccess(thr, pc, fd);
1171   return REAL(__fxstat64)(version, fd, buf);
1172 }
1173
1174 TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1175   SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
1176   if (fd > 0)
1177     FdAccess(thr, pc, fd);
1178   return REAL(__fxstat64)(0, fd, buf);
1179 }
1180
1181 TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1182   SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1183   int fd = REAL(open)(name, flags, mode);
1184   if (fd >= 0)
1185     FdFileCreate(thr, pc, fd);
1186   return fd;
1187 }
1188
1189 TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
1190   SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
1191   int fd = REAL(open64)(name, flags, mode);
1192   if (fd >= 0)
1193     FdFileCreate(thr, pc, fd);
1194   return fd;
1195 }
1196
1197 TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1198   SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1199   int fd = REAL(creat)(name, mode);
1200   if (fd >= 0)
1201     FdFileCreate(thr, pc, fd);
1202   return fd;
1203 }
1204
1205 TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1206   SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1207   int fd = REAL(creat64)(name, mode);
1208   if (fd >= 0)
1209     FdFileCreate(thr, pc, fd);
1210   return fd;
1211 }
1212
1213 TSAN_INTERCEPTOR(int, dup, int oldfd) {
1214   SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1215   int newfd = REAL(dup)(oldfd);
1216   if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1217     FdDup(thr, pc, oldfd, newfd);
1218   return newfd;
1219 }
1220
1221 TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1222   SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1223   int newfd2 = REAL(dup2)(oldfd, newfd);
1224   if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1225     FdDup(thr, pc, oldfd, newfd2);
1226   return newfd2;
1227 }
1228
1229 TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1230   SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1231   int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1232   if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1233     FdDup(thr, pc, oldfd, newfd2);
1234   return newfd2;
1235 }
1236
1237 TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1238   SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1239   int fd = REAL(eventfd)(initval, flags);
1240   if (fd >= 0)
1241     FdEventCreate(thr, pc, fd);
1242   return fd;
1243 }
1244
1245 TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1246   SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1247   if (fd >= 0)
1248     FdClose(thr, pc, fd);
1249   fd = REAL(signalfd)(fd, mask, flags);
1250   if (fd >= 0)
1251     FdSignalCreate(thr, pc, fd);
1252   return fd;
1253 }
1254
1255 TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1256   SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1257   int fd = REAL(inotify_init)(fake);
1258   if (fd >= 0)
1259     FdInotifyCreate(thr, pc, fd);
1260   return fd;
1261 }
1262
1263 TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1264   SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1265   int fd = REAL(inotify_init1)(flags);
1266   if (fd >= 0)
1267     FdInotifyCreate(thr, pc, fd);
1268   return fd;
1269 }
1270
1271 TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1272   SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1273   int fd = REAL(socket)(domain, type, protocol);
1274   if (fd >= 0)
1275     FdSocketCreate(thr, pc, fd);
1276   return fd;
1277 }
1278
1279 TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1280   SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1281   int res = REAL(socketpair)(domain, type, protocol, fd);
1282   if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1283     FdPipeCreate(thr, pc, fd[0], fd[1]);
1284   return res;
1285 }
1286
1287 TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1288   SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1289   FdSocketConnecting(thr, pc, fd);
1290   int res = REAL(connect)(fd, addr, addrlen);
1291   if (res == 0 && fd >= 0)
1292     FdSocketConnect(thr, pc, fd);
1293   return res;
1294 }
1295
1296 TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
1297   SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
1298   int res = REAL(bind)(fd, addr, addrlen);
1299   if (fd > 0 && res == 0)
1300     FdAccess(thr, pc, fd);
1301   return res;
1302 }
1303
1304 TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
1305   SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
1306   int res = REAL(listen)(fd, backlog);
1307   if (fd > 0 && res == 0)
1308     FdAccess(thr, pc, fd);
1309   return res;
1310 }
1311
1312 TSAN_INTERCEPTOR(int, accept, int fd, void *addr, unsigned *addrlen) {
1313   SCOPED_TSAN_INTERCEPTOR(accept, fd, addr, addrlen);
1314   int fd2 = REAL(accept)(fd, addr, addrlen);
1315   if (fd >= 0 && fd2 >= 0)
1316     FdSocketAccept(thr, pc, fd, fd2);
1317   return fd2;
1318 }
1319
1320 TSAN_INTERCEPTOR(int, accept4, int fd, void *addr, unsigned *addrlen, int f) {
1321   SCOPED_TSAN_INTERCEPTOR(accept4, fd, addr, addrlen, f);
1322   int fd2 = REAL(accept4)(fd, addr, addrlen, f);
1323   if (fd >= 0 && fd2 >= 0)
1324     FdSocketAccept(thr, pc, fd, fd2);
1325   return fd2;
1326 }
1327
1328 TSAN_INTERCEPTOR(int, epoll_create, int size) {
1329   SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1330   int fd = REAL(epoll_create)(size);
1331   if (fd >= 0)
1332     FdPollCreate(thr, pc, fd);
1333   return fd;
1334 }
1335
1336 TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1337   SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1338   int fd = REAL(epoll_create1)(flags);
1339   if (fd >= 0)
1340     FdPollCreate(thr, pc, fd);
1341   return fd;
1342 }
1343
1344 TSAN_INTERCEPTOR(int, close, int fd) {
1345   SCOPED_TSAN_INTERCEPTOR(close, fd);
1346   if (fd >= 0)
1347     FdClose(thr, pc, fd);
1348   return REAL(close)(fd);
1349 }
1350
1351 TSAN_INTERCEPTOR(int, __close, int fd) {
1352   SCOPED_TSAN_INTERCEPTOR(__close, fd);
1353   if (fd >= 0)
1354     FdClose(thr, pc, fd);
1355   return REAL(__close)(fd);
1356 }
1357
1358 // glibc guts
1359 TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
1360   SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
1361   int fds[64];
1362   int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
1363   for (int i = 0; i < cnt; i++) {
1364     if (fds[i] > 0)
1365       FdClose(thr, pc, fds[i]);
1366   }
1367   REAL(__res_iclose)(state, free_addr);
1368 }
1369
1370 TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1371   SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1372   int res = REAL(pipe)(pipefd);
1373   if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1374     FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1375   return res;
1376 }
1377
1378 TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1379   SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1380   int res = REAL(pipe2)(pipefd, flags);
1381   if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1382     FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1383   return res;
1384 }
1385
1386 TSAN_INTERCEPTOR(long_t, readv, int fd, void *vec, int cnt) {
1387   SCOPED_TSAN_INTERCEPTOR(readv, fd, vec, cnt);
1388   int res = REAL(readv)(fd, vec, cnt);
1389   if (res >= 0 && fd >= 0) {
1390     FdAcquire(thr, pc, fd);
1391   }
1392   return res;
1393 }
1394
1395 TSAN_INTERCEPTOR(long_t, preadv64, int fd, void *vec, int cnt, u64 off) {
1396   SCOPED_TSAN_INTERCEPTOR(preadv64, fd, vec, cnt, off);
1397   int res = REAL(preadv64)(fd, vec, cnt, off);
1398   if (res >= 0 && fd >= 0) {
1399     FdAcquire(thr, pc, fd);
1400   }
1401   return res;
1402 }
1403
1404 TSAN_INTERCEPTOR(long_t, writev, int fd, void *vec, int cnt) {
1405   SCOPED_TSAN_INTERCEPTOR(writev, fd, vec, cnt);
1406   if (fd >= 0)
1407     FdRelease(thr, pc, fd);
1408   int res = REAL(writev)(fd, vec, cnt);
1409   return res;
1410 }
1411
1412 TSAN_INTERCEPTOR(long_t, pwritev64, int fd, void *vec, int cnt, u64 off) {
1413   SCOPED_TSAN_INTERCEPTOR(pwritev64, fd, vec, cnt, off);
1414   if (fd >= 0)
1415     FdRelease(thr, pc, fd);
1416   int res = REAL(pwritev64)(fd, vec, cnt, off);
1417   return res;
1418 }
1419
1420 TSAN_INTERCEPTOR(long_t, send, int fd, void *buf, long_t len, int flags) {
1421   SCOPED_TSAN_INTERCEPTOR(send, fd, buf, len, flags);
1422   if (fd >= 0)
1423     FdRelease(thr, pc, fd);
1424   int res = REAL(send)(fd, buf, len, flags);
1425   return res;
1426 }
1427
1428 TSAN_INTERCEPTOR(long_t, sendmsg, int fd, void *msg, int flags) {
1429   SCOPED_TSAN_INTERCEPTOR(sendmsg, fd, msg, flags);
1430   if (fd >= 0)
1431     FdRelease(thr, pc, fd);
1432   int res = REAL(sendmsg)(fd, msg, flags);
1433   return res;
1434 }
1435
1436 TSAN_INTERCEPTOR(long_t, recv, int fd, void *buf, long_t len, int flags) {
1437   SCOPED_TSAN_INTERCEPTOR(recv, fd, buf, len, flags);
1438   int res = REAL(recv)(fd, buf, len, flags);
1439   if (res >= 0 && fd >= 0) {
1440     FdAcquire(thr, pc, fd);
1441   }
1442   return res;
1443 }
1444
1445 TSAN_INTERCEPTOR(long_t, recvmsg, int fd, void *msg, int flags) {
1446   SCOPED_TSAN_INTERCEPTOR(recvmsg, fd, msg, flags);
1447   int res = REAL(recvmsg)(fd, msg, flags);
1448   if (res >= 0 && fd >= 0) {
1449     FdAcquire(thr, pc, fd);
1450   }
1451   return res;
1452 }
1453
1454 TSAN_INTERCEPTOR(int, unlink, char *path) {
1455   SCOPED_TSAN_INTERCEPTOR(unlink, path);
1456   Release(thr, pc, File2addr(path));
1457   int res = REAL(unlink)(path);
1458   return res;
1459 }
1460
1461 TSAN_INTERCEPTOR(void*, fopen, char *path, char *mode) {
1462   SCOPED_TSAN_INTERCEPTOR(fopen, path, mode);
1463   void *res = REAL(fopen)(path, mode);
1464   Acquire(thr, pc, File2addr(path));
1465   if (res) {
1466     int fd = fileno_unlocked(res);
1467     if (fd >= 0)
1468       FdFileCreate(thr, pc, fd);
1469   }
1470   return res;
1471 }
1472
1473 TSAN_INTERCEPTOR(void*, freopen, char *path, char *mode, void *stream) {
1474   SCOPED_TSAN_INTERCEPTOR(freopen, path, mode, stream);
1475   if (stream) {
1476     int fd = fileno_unlocked(stream);
1477     if (fd >= 0)
1478       FdClose(thr, pc, fd);
1479   }
1480   void *res = REAL(freopen)(path, mode, stream);
1481   Acquire(thr, pc, File2addr(path));
1482   if (res) {
1483     int fd = fileno_unlocked(res);
1484     if (fd >= 0)
1485       FdFileCreate(thr, pc, fd);
1486   }
1487   return res;
1488 }
1489
1490 TSAN_INTERCEPTOR(int, fclose, void *stream) {
1491   {
1492     SCOPED_TSAN_INTERCEPTOR(fclose, stream);
1493     if (stream) {
1494       int fd = fileno_unlocked(stream);
1495       if (fd >= 0)
1496         FdClose(thr, pc, fd);
1497     }
1498   }
1499   return REAL(fclose)(stream);
1500 }
1501
1502 TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1503   {
1504     SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1505     MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1506   }
1507   return REAL(fread)(ptr, size, nmemb, f);
1508 }
1509
1510 TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1511   {
1512     SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1513     MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1514   }
1515   return REAL(fwrite)(p, size, nmemb, f);
1516 }
1517
1518 TSAN_INTERCEPTOR(int, puts, const char *s) {
1519   SCOPED_TSAN_INTERCEPTOR(puts, s);
1520   MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1521   return REAL(puts)(s);
1522 }
1523
1524 TSAN_INTERCEPTOR(int, rmdir, char *path) {
1525   SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1526   Release(thr, pc, Dir2addr(path));
1527   int res = REAL(rmdir)(path);
1528   return res;
1529 }
1530
1531 TSAN_INTERCEPTOR(void*, opendir, char *path) {
1532   SCOPED_TSAN_INTERCEPTOR(opendir, path);
1533   void *res = REAL(opendir)(path);
1534   if (res != 0)
1535     Acquire(thr, pc, Dir2addr(path));
1536   return res;
1537 }
1538
1539 TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1540   SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1541   if (op == EPOLL_CTL_ADD && epfd >= 0) {
1542     FdRelease(thr, pc, epfd);
1543   }
1544   int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1545   if (fd >= 0)
1546     FdAccess(thr, pc, fd);
1547   return res;
1548 }
1549
1550 TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1551   SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1552   int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1553   if (res > 0 && epfd >= 0) {
1554     FdAcquire(thr, pc, epfd);
1555   }
1556   return res;
1557 }
1558
1559 TSAN_INTERCEPTOR(int, poll, void *fds, long_t nfds, int timeout) {
1560   SCOPED_TSAN_INTERCEPTOR(poll, fds, nfds, timeout);
1561   int res = BLOCK_REAL(poll)(fds, nfds, timeout);
1562   return res;
1563 }
1564
1565 static void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1566     my_siginfo_t *info, void *ctx) {
1567   ThreadState *thr = cur_thread();
1568   SignalContext *sctx = SigCtx(thr);
1569   // Don't mess with synchronous signals.
1570   if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1571       sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE ||
1572       // If we are sending signal to ourselves, we must process it now.
1573       (sctx && sig == sctx->int_signal_send) ||
1574       // If we are in blocking function, we can safely process it now
1575       // (but check if we are in a recursive interceptor,
1576       // i.e. pthread_join()->munmap()).
1577       (sctx && sctx->in_blocking_func == 1 && thr->in_rtl == 1)) {
1578     CHECK(thr->in_rtl == 0 || thr->in_rtl == 1);
1579     int in_rtl = thr->in_rtl;
1580     thr->in_rtl = 0;
1581     CHECK_EQ(thr->in_signal_handler, false);
1582     thr->in_signal_handler = true;
1583     if (sigact)
1584       sigactions[sig].sa_sigaction(sig, info, ctx);
1585     else
1586       sigactions[sig].sa_handler(sig);
1587     CHECK_EQ(thr->in_signal_handler, true);
1588     thr->in_signal_handler = false;
1589     thr->in_rtl = in_rtl;
1590     return;
1591   }
1592
1593   if (sctx == 0)
1594     return;
1595   SignalDesc *signal = &sctx->pending_signals[sig];
1596   if (signal->armed == false) {
1597     signal->armed = true;
1598     signal->sigaction = sigact;
1599     if (info)
1600       internal_memcpy(&signal->siginfo, info, sizeof(*info));
1601     if (ctx)
1602       internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1603     sctx->pending_signal_count++;
1604   }
1605 }
1606
1607 static void rtl_sighandler(int sig) {
1608   rtl_generic_sighandler(false, sig, 0, 0);
1609 }
1610
1611 static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1612   rtl_generic_sighandler(true, sig, info, ctx);
1613 }
1614
1615 TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1616   SCOPED_TSAN_INTERCEPTOR(sigaction, sig, act, old);
1617   if (old)
1618     internal_memcpy(old, &sigactions[sig], sizeof(*old));
1619   if (act == 0)
1620     return 0;
1621   internal_memcpy(&sigactions[sig], act, sizeof(*act));
1622   sigaction_t newact;
1623   internal_memcpy(&newact, act, sizeof(newact));
1624   sigfillset(&newact.sa_mask);
1625   if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1626     if (newact.sa_flags & SA_SIGINFO)
1627       newact.sa_sigaction = rtl_sigaction;
1628     else
1629       newact.sa_handler = rtl_sighandler;
1630   }
1631   int res = REAL(sigaction)(sig, &newact, 0);
1632   return res;
1633 }
1634
1635 TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1636   sigaction_t act;
1637   act.sa_handler = h;
1638   REAL(memset)(&act.sa_mask, -1, sizeof(act.sa_mask));
1639   act.sa_flags = 0;
1640   sigaction_t old;
1641   int res = sigaction(sig, &act, &old);
1642   if (res)
1643     return SIG_ERR;
1644   return old.sa_handler;
1645 }
1646
1647 TSAN_INTERCEPTOR(int, raise, int sig) {
1648   SCOPED_TSAN_INTERCEPTOR(raise, sig);
1649   SignalContext *sctx = SigCtx(thr);
1650   CHECK_NE(sctx, 0);
1651   int prev = sctx->int_signal_send;
1652   sctx->int_signal_send = sig;
1653   int res = REAL(raise)(sig);
1654   CHECK_EQ(sctx->int_signal_send, sig);
1655   sctx->int_signal_send = prev;
1656   return res;
1657 }
1658
1659 TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1660   SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1661   SignalContext *sctx = SigCtx(thr);
1662   CHECK_NE(sctx, 0);
1663   int prev = sctx->int_signal_send;
1664   if (pid == GetPid()) {
1665     sctx->int_signal_send = sig;
1666   }
1667   int res = REAL(kill)(pid, sig);
1668   if (pid == GetPid()) {
1669     CHECK_EQ(sctx->int_signal_send, sig);
1670     sctx->int_signal_send = prev;
1671   }
1672   return res;
1673 }
1674
1675 TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1676   SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1677   SignalContext *sctx = SigCtx(thr);
1678   CHECK_NE(sctx, 0);
1679   int prev = sctx->int_signal_send;
1680   if (tid == pthread_self()) {
1681     sctx->int_signal_send = sig;
1682   }
1683   int res = REAL(pthread_kill)(tid, sig);
1684   if (tid == pthread_self()) {
1685     CHECK_EQ(sctx->int_signal_send, sig);
1686     sctx->int_signal_send = prev;
1687   }
1688   return res;
1689 }
1690
1691 TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
1692   SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
1693   // It's intercepted merely to process pending signals.
1694   return REAL(gettimeofday)(tv, tz);
1695 }
1696
1697 // Linux kernel has a bug that leads to kernel deadlock if a process
1698 // maps TBs of memory and then calls mlock().
1699 static void MlockIsUnsupported() {
1700   static atomic_uint8_t printed;
1701   if (atomic_exchange(&printed, 1, memory_order_relaxed))
1702     return;
1703   Printf("INFO: ThreadSanitizer ignores mlock/mlockall/munlock/munlockall\n");
1704 }
1705
1706 TSAN_INTERCEPTOR(int, mlock, const void *addr, uptr len) {
1707   MlockIsUnsupported();
1708   return 0;
1709 }
1710
1711 TSAN_INTERCEPTOR(int, munlock, const void *addr, uptr len) {
1712   MlockIsUnsupported();
1713   return 0;
1714 }
1715
1716 TSAN_INTERCEPTOR(int, mlockall, int flags) {
1717   MlockIsUnsupported();
1718   return 0;
1719 }
1720
1721 TSAN_INTERCEPTOR(int, munlockall, void) {
1722   MlockIsUnsupported();
1723   return 0;
1724 }
1725
1726 TSAN_INTERCEPTOR(int, fork, int fake) {
1727   SCOPED_TSAN_INTERCEPTOR(fork, fake);
1728   // It's intercepted merely to process pending signals.
1729   int pid = REAL(fork)(fake);
1730   if (pid == 0) {
1731     // child
1732     FdOnFork(thr, pc);
1733   } else if (pid > 0) {
1734     // parent
1735   }
1736   return pid;
1737 }
1738
1739 struct TsanInterceptorContext {
1740   ThreadState *thr;
1741   const uptr caller_pc;
1742   const uptr pc;
1743 };
1744
1745 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
1746     MemoryAccessRange(((TsanInterceptorContext*)ctx)->thr,  \
1747                       ((TsanInterceptorContext*)ctx)->pc,   \
1748                       (uptr)ptr, size, true)
1749 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size)       \
1750     MemoryAccessRange(((TsanInterceptorContext*)ctx)->thr,  \
1751                       ((TsanInterceptorContext*)ctx)->pc,   \
1752                       (uptr)ptr, size, false)
1753 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
1754     SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__) \
1755     TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
1756     ctx = (void*)&_ctx; \
1757     (void)ctx;
1758 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1759     FdAcquire(((TsanInterceptorContext*)ctx)->thr, pc, fd)
1760 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1761     FdRelease(((TsanInterceptorContext*)ctx)->thr, pc, fd)
1762 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1763     ThreadSetName(((TsanInterceptorContext*)ctx)->thr, name)
1764 #include "sanitizer_common/sanitizer_common_interceptors.inc"
1765
1766 namespace __tsan {
1767
1768 void ProcessPendingSignals(ThreadState *thr) {
1769   CHECK_EQ(thr->in_rtl, 0);
1770   SignalContext *sctx = SigCtx(thr);
1771   if (sctx == 0 || sctx->pending_signal_count == 0 || thr->in_signal_handler)
1772     return;
1773   Context *ctx = CTX();
1774   thr->in_signal_handler = true;
1775   sctx->pending_signal_count = 0;
1776   // These are too big for stack.
1777   static THREADLOCAL sigset_t emptyset, oldset;
1778   sigfillset(&emptyset);
1779   pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
1780   for (int sig = 0; sig < kSigCount; sig++) {
1781     SignalDesc *signal = &sctx->pending_signals[sig];
1782     if (signal->armed) {
1783       signal->armed = false;
1784       if (sigactions[sig].sa_handler != SIG_DFL
1785           && sigactions[sig].sa_handler != SIG_IGN) {
1786         // Insure that the handler does not spoil errno.
1787         const int saved_errno = errno;
1788         errno = 0;
1789         if (signal->sigaction)
1790           sigactions[sig].sa_sigaction(sig, &signal->siginfo, &signal->ctx);
1791         else
1792           sigactions[sig].sa_handler(sig);
1793         if (flags()->report_bugs && errno != 0) {
1794           ScopedInRtl in_rtl;
1795           __tsan::StackTrace stack;
1796           uptr pc = signal->sigaction ?
1797               (uptr)sigactions[sig].sa_sigaction :
1798               (uptr)sigactions[sig].sa_handler;
1799           stack.Init(&pc, 1);
1800           Lock l(&ctx->thread_mtx);
1801           ScopedReport rep(ReportTypeErrnoInSignal);
1802           if (!IsFiredSuppression(ctx, rep, stack)) {
1803             rep.AddStack(&stack);
1804             OutputReport(ctx, rep, rep.GetReport()->stacks[0]);
1805           }
1806         }
1807         errno = saved_errno;
1808       }
1809     }
1810   }
1811   pthread_sigmask(SIG_SETMASK, &oldset, 0);
1812   CHECK_EQ(thr->in_signal_handler, true);
1813   thr->in_signal_handler = false;
1814 }
1815
1816 static void unreachable() {
1817   Printf("FATAL: ThreadSanitizer: unreachable called\n");
1818   Die();
1819 }
1820
1821 void InitializeInterceptors() {
1822   CHECK_GT(cur_thread()->in_rtl, 0);
1823
1824   // We need to setup it early, because functions like dlsym() can call it.
1825   REAL(memset) = internal_memset;
1826   REAL(memcpy) = internal_memcpy;
1827   REAL(memcmp) = internal_memcmp;
1828
1829   SANITIZER_COMMON_INTERCEPTORS_INIT;
1830
1831   TSAN_INTERCEPT(longjmp);
1832   TSAN_INTERCEPT(siglongjmp);
1833
1834   TSAN_INTERCEPT(malloc);
1835   TSAN_INTERCEPT(__libc_memalign);
1836   TSAN_INTERCEPT(calloc);
1837   TSAN_INTERCEPT(realloc);
1838   TSAN_INTERCEPT(free);
1839   TSAN_INTERCEPT(cfree);
1840   TSAN_INTERCEPT(mmap);
1841   TSAN_INTERCEPT(mmap64);
1842   TSAN_INTERCEPT(munmap);
1843   TSAN_INTERCEPT(memalign);
1844   TSAN_INTERCEPT(valloc);
1845   TSAN_INTERCEPT(pvalloc);
1846   TSAN_INTERCEPT(posix_memalign);
1847
1848   TSAN_INTERCEPT(strlen);
1849   TSAN_INTERCEPT(memset);
1850   TSAN_INTERCEPT(memcpy);
1851   TSAN_INTERCEPT(strcmp);
1852   TSAN_INTERCEPT(memchr);
1853   TSAN_INTERCEPT(memrchr);
1854   TSAN_INTERCEPT(memmove);
1855   TSAN_INTERCEPT(memcmp);
1856   TSAN_INTERCEPT(strchr);
1857   TSAN_INTERCEPT(strchrnul);
1858   TSAN_INTERCEPT(strrchr);
1859   TSAN_INTERCEPT(strncmp);
1860   TSAN_INTERCEPT(strcpy);  // NOLINT
1861   TSAN_INTERCEPT(strncpy);
1862   TSAN_INTERCEPT(strstr);
1863
1864   TSAN_INTERCEPT(pthread_create);
1865   TSAN_INTERCEPT(pthread_join);
1866   TSAN_INTERCEPT(pthread_detach);
1867
1868   TSAN_INTERCEPT(pthread_mutex_init);
1869   TSAN_INTERCEPT(pthread_mutex_destroy);
1870   TSAN_INTERCEPT(pthread_mutex_lock);
1871   TSAN_INTERCEPT(pthread_mutex_trylock);
1872   TSAN_INTERCEPT(pthread_mutex_timedlock);
1873   TSAN_INTERCEPT(pthread_mutex_unlock);
1874
1875   TSAN_INTERCEPT(pthread_spin_init);
1876   TSAN_INTERCEPT(pthread_spin_destroy);
1877   TSAN_INTERCEPT(pthread_spin_lock);
1878   TSAN_INTERCEPT(pthread_spin_trylock);
1879   TSAN_INTERCEPT(pthread_spin_unlock);
1880
1881   TSAN_INTERCEPT(pthread_rwlock_init);
1882   TSAN_INTERCEPT(pthread_rwlock_destroy);
1883   TSAN_INTERCEPT(pthread_rwlock_rdlock);
1884   TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
1885   TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
1886   TSAN_INTERCEPT(pthread_rwlock_wrlock);
1887   TSAN_INTERCEPT(pthread_rwlock_trywrlock);
1888   TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
1889   TSAN_INTERCEPT(pthread_rwlock_unlock);
1890
1891   // TSAN_INTERCEPT(pthread_cond_init);
1892   TSAN_INTERCEPT(pthread_cond_destroy);
1893   TSAN_INTERCEPT(pthread_cond_signal);
1894   TSAN_INTERCEPT(pthread_cond_broadcast);
1895   TSAN_INTERCEPT(pthread_cond_wait);
1896   TSAN_INTERCEPT(pthread_cond_timedwait);
1897
1898   TSAN_INTERCEPT(pthread_barrier_init);
1899   TSAN_INTERCEPT(pthread_barrier_destroy);
1900   TSAN_INTERCEPT(pthread_barrier_wait);
1901
1902   TSAN_INTERCEPT(pthread_once);
1903
1904   TSAN_INTERCEPT(sem_init);
1905   TSAN_INTERCEPT(sem_destroy);
1906   TSAN_INTERCEPT(sem_wait);
1907   TSAN_INTERCEPT(sem_trywait);
1908   TSAN_INTERCEPT(sem_timedwait);
1909   TSAN_INTERCEPT(sem_post);
1910   TSAN_INTERCEPT(sem_getvalue);
1911
1912   TSAN_INTERCEPT(stat);
1913   TSAN_INTERCEPT(__xstat);
1914   TSAN_INTERCEPT(stat64);
1915   TSAN_INTERCEPT(__xstat64);
1916   TSAN_INTERCEPT(lstat);
1917   TSAN_INTERCEPT(__lxstat);
1918   TSAN_INTERCEPT(lstat64);
1919   TSAN_INTERCEPT(__lxstat64);
1920   TSAN_INTERCEPT(fstat);
1921   TSAN_INTERCEPT(__fxstat);
1922   TSAN_INTERCEPT(fstat64);
1923   TSAN_INTERCEPT(__fxstat64);
1924   TSAN_INTERCEPT(open);
1925   TSAN_INTERCEPT(open64);
1926   TSAN_INTERCEPT(creat);
1927   TSAN_INTERCEPT(creat64);
1928   TSAN_INTERCEPT(dup);
1929   TSAN_INTERCEPT(dup2);
1930   TSAN_INTERCEPT(dup3);
1931   TSAN_INTERCEPT(eventfd);
1932   TSAN_INTERCEPT(signalfd);
1933   TSAN_INTERCEPT(inotify_init);
1934   TSAN_INTERCEPT(inotify_init1);
1935   TSAN_INTERCEPT(socket);
1936   TSAN_INTERCEPT(socketpair);
1937   TSAN_INTERCEPT(connect);
1938   TSAN_INTERCEPT(bind);
1939   TSAN_INTERCEPT(listen);
1940   TSAN_INTERCEPT(accept);
1941   TSAN_INTERCEPT(accept4);
1942   TSAN_INTERCEPT(epoll_create);
1943   TSAN_INTERCEPT(epoll_create1);
1944   TSAN_INTERCEPT(close);
1945   TSAN_INTERCEPT(__close);
1946   TSAN_INTERCEPT(__res_iclose);
1947   TSAN_INTERCEPT(pipe);
1948   TSAN_INTERCEPT(pipe2);
1949
1950   TSAN_INTERCEPT(readv);
1951   TSAN_INTERCEPT(preadv64);
1952   TSAN_INTERCEPT(writev);
1953   TSAN_INTERCEPT(pwritev64);
1954   TSAN_INTERCEPT(send);
1955   TSAN_INTERCEPT(sendmsg);
1956   TSAN_INTERCEPT(recv);
1957   TSAN_INTERCEPT(recvmsg);
1958
1959   TSAN_INTERCEPT(unlink);
1960   TSAN_INTERCEPT(fopen);
1961   TSAN_INTERCEPT(freopen);
1962   TSAN_INTERCEPT(fclose);
1963   TSAN_INTERCEPT(fread);
1964   TSAN_INTERCEPT(fwrite);
1965   TSAN_INTERCEPT(puts);
1966   TSAN_INTERCEPT(rmdir);
1967   TSAN_INTERCEPT(opendir);
1968
1969   TSAN_INTERCEPT(epoll_ctl);
1970   TSAN_INTERCEPT(epoll_wait);
1971   TSAN_INTERCEPT(poll);
1972
1973   TSAN_INTERCEPT(sigaction);
1974   TSAN_INTERCEPT(signal);
1975   TSAN_INTERCEPT(raise);
1976   TSAN_INTERCEPT(kill);
1977   TSAN_INTERCEPT(pthread_kill);
1978   TSAN_INTERCEPT(sleep);
1979   TSAN_INTERCEPT(usleep);
1980   TSAN_INTERCEPT(nanosleep);
1981   TSAN_INTERCEPT(gettimeofday);
1982
1983   TSAN_INTERCEPT(mlock);
1984   TSAN_INTERCEPT(munlock);
1985   TSAN_INTERCEPT(mlockall);
1986   TSAN_INTERCEPT(munlockall);
1987
1988   TSAN_INTERCEPT(fork);
1989   TSAN_INTERCEPT(on_exit);
1990   TSAN_INTERCEPT(__cxa_atexit);
1991
1992   // Need to setup it, because interceptors check that the function is resolved.
1993   // But atexit is emitted directly into the module, so can't be resolved.
1994   REAL(atexit) = (int(*)(void(*)()))unreachable;
1995   atexit_ctx = new(internal_alloc(MBlockAtExit, sizeof(AtExitContext)))
1996       AtExitContext();
1997
1998   if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
1999     Printf("ThreadSanitizer: failed to setup atexit callback\n");
2000     Die();
2001   }
2002
2003   if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
2004     Printf("ThreadSanitizer: failed to create thread key\n");
2005     Die();
2006   }
2007
2008   FdInit();
2009 }
2010
2011 void internal_start_thread(void(*func)(void *arg), void *arg) {
2012   void *th;
2013   REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
2014   REAL(pthread_detach)(th);
2015 }
2016
2017 }  // namespace __tsan