lib/tsan/rtl/tsan_interceptors.cc

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