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 __cxa_atexit(void (*func)(void *arg), void *arg, void *dso);
  57 extern "C" int *__errno_location();
  58 extern "C" int fileno_unlocked(void *stream);
  59 const int PTHREAD_MUTEX_RECURSIVE = 1;
  60 const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
  61 const int kPthreadAttrSize = 56;
  62 const int EINVAL = 22;
  63 const int EBUSY = 16;
  64 const int EPOLL_CTL_ADD = 1;
  65 const int SIGILL = 4;
  66 const int SIGABRT = 6;
  67 const int SIGFPE = 8;
  68 const int SIGSEGV = 11;
  69 const int SIGPIPE = 13;
  70 const int SIGBUS = 7;
  71 void *const MAP_FAILED = (void*)-1;
  72 const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
  73 const int MAP_FIXED = 0x10;
  74 typedef long long_t;  // NOLINT
  75
  76 // From /usr/include/unistd.h
  77 # define F_ULOCK 0      /* Unlock a previously locked region.  */
  78 # define F_LOCK  1      /* Lock a region for exclusive use.  */
  79 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
  80 # define F_TEST  3      /* Test a region for other processes locks.  */
  81
  82 typedef void (*sighandler_t)(int sig);
  83
  84 #define errno (*__errno_location())
  85
  86 union pthread_attr_t {
  87   char size[kPthreadAttrSize];
  88   void *align;
  89 };
  90
  91 struct sigaction_t {
  92   union {
  93     sighandler_t sa_handler;
  94     void (*sa_sigaction)(int sig, my_siginfo_t *siginfo, void *uctx);
  95   };
  96   sigset_t sa_mask;
  97   int sa_flags;
  98   void (*sa_restorer)();
  99 };
 100
 101 const sighandler_t SIG_DFL = (sighandler_t)0;
 102 const sighandler_t SIG_IGN = (sighandler_t)1;
 103 const sighandler_t SIG_ERR = (sighandler_t)-1;
 104 const int SA_SIGINFO = 4;
 105 const int SIG_SETMASK = 2;
 106
 107 namespace std {
 108 struct nothrow_t {};
 109 }  // namespace std
 110
 111 static sigaction_t sigactions[kSigCount];
 112
 113 namespace __tsan {
 114 struct SignalDesc {
 115   bool armed;
 116   bool sigaction;
 117   my_siginfo_t siginfo;
 118   ucontext_t ctx;
 119 };
 120
 121 struct SignalContext {
 122   int in_blocking_func;
 123   int int_signal_send;
 124   int pending_signal_count;
 125   SignalDesc pending_signals[kSigCount];
 126 };
 127 }
 128
 129 static SignalContext *SigCtx(ThreadState *thr) {
 130   SignalContext *ctx = (SignalContext*)thr->signal_ctx;
 131   if (ctx == 0 && thr->is_alive) {
 132     ScopedInRtl in_rtl;
 133     ctx = (SignalContext*)MmapOrDie(sizeof(*ctx), "SignalContext");
 134     MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
 135     thr->signal_ctx = ctx;
 136   }
 137   return ctx;
 138 }
 139
 140 static unsigned g_thread_finalize_key;
 141
 142 class ScopedInterceptor {
 143  public:
 144   ScopedInterceptor(ThreadState *thr, const char *fname, uptr pc);
 145   ~ScopedInterceptor();
 146  private:
 147   ThreadState *const thr_;
 148   const int in_rtl_;
 149 };
 150
 151 ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
 152                                      uptr pc)
 153     : thr_(thr)
 154     , in_rtl_(thr->in_rtl) {
 155   if (thr_->in_rtl == 0) {
 156     Initialize(thr);
 157     FuncEntry(thr, pc);
 158     thr_->in_rtl++;
 159     DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
 160   } else {
 161     thr_->in_rtl++;
 162   }
 163 }
 164
 165 ScopedInterceptor::~ScopedInterceptor() {
 166   thr_->in_rtl--;
 167   if (thr_->in_rtl == 0) {
 168     FuncExit(thr_);
 169     ProcessPendingSignals(thr_);
 170   }
 171   CHECK_EQ(in_rtl_, thr_->in_rtl);
 172 }
 173
 174 #define SCOPED_INTERCEPTOR_RAW(func, ...) \
 175     ThreadState *thr = cur_thread(); \
 176     StatInc(thr, StatInterceptor); \
 177     StatInc(thr, StatInt_##func); \
 178     const uptr caller_pc = GET_CALLER_PC(); \
 179     ScopedInterceptor si(thr, #func, caller_pc); \
 180     const uptr pc = __sanitizer::StackTrace::GetPreviousInstructionPc( \
 181         __sanitizer::StackTrace::GetCurrentPc()); \
 182     (void)pc; \
 183 /**/
 184
 185 #define SCOPED_TSAN_INTERCEPTOR(func, ...) \
 186     SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
 187     if (REAL(func) == 0) { \
 188       Printf("FATAL: ThreadSanitizer: failed to intercept %s\n", #func); \
 189       Die(); \
 190     } \
 191     if (thr->in_rtl > 1) \
 192       return REAL(func)(__VA_ARGS__); \
 193 /**/
 194
 195 #define TSAN_INTERCEPTOR(ret, func, ...) INTERCEPTOR(ret, func, __VA_ARGS__)
 196 #define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
 197
 198 #define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
 199
 200 struct BlockingCall {
 201   explicit BlockingCall(ThreadState *thr)
 202       : ctx(SigCtx(thr)) {
 203     ctx->in_blocking_func++;
 204   }
 205
 206   ~BlockingCall() {
 207     ctx->in_blocking_func--;
 208   }
 209
 210   SignalContext *ctx;
 211 };
 212
 213 TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
 214   SCOPED_TSAN_INTERCEPTOR(sleep, sec);
 215   unsigned res = BLOCK_REAL(sleep)(sec);
 216   AfterSleep(thr, pc);
 217   return res;
 218 }
 219
 220 TSAN_INTERCEPTOR(int, usleep, long_t usec) {
 221   SCOPED_TSAN_INTERCEPTOR(usleep, usec);
 222   int res = BLOCK_REAL(usleep)(usec);
 223   AfterSleep(thr, pc);
 224   return res;
 225 }
 226
 227 TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
 228   SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
 229   int res = BLOCK_REAL(nanosleep)(req, rem);
 230   AfterSleep(thr, pc);
 231   return res;
 232 }
 233
 234 class AtExitContext {
 235  public:
 236   AtExitContext()
 237     : mtx_(MutexTypeAtExit, StatMtxAtExit)
 238     , pos_() {
 239   }
 240
 241   typedef void(*atexit_t)();
 242
 243   int atexit(ThreadState *thr, uptr pc, atexit_t f) {
 244     Lock l(&mtx_);
 245     if (pos_ == kMaxAtExit)
 246       return 1;
 247     Release(thr, pc, (uptr)this);
 248     stack_[pos_] = f;
 249     pos_++;
 250     return 0;
 251   }
 252
 253   void exit(ThreadState *thr, uptr pc) {
 254     CHECK_EQ(thr->in_rtl, 0);
 255     for (;;) {
 256       atexit_t f = 0;
 257       {
 258         Lock l(&mtx_);
 259         if (pos_) {
 260           pos_--;
 261           f = stack_[pos_];
 262           ScopedInRtl in_rtl;
 263           Acquire(thr, pc, (uptr)this);
 264         }
 265       }
 266       if (f == 0)
 267         break;
 268       DPrintf("#%d: executing atexit func %p\n", thr->tid, f);
 269       CHECK_EQ(thr->in_rtl, 0);
 270       f();
 271     }
 272   }
 273
 274  private:
 275   static const int kMaxAtExit = 128;
 276   Mutex mtx_;
 277   atexit_t stack_[kMaxAtExit];
 278   int pos_;
 279 };
 280
 281 static AtExitContext *atexit_ctx;
 282
 283 static void finalize(void *arg) {
 284   ThreadState * thr = cur_thread();
 285   uptr pc = 0;
 286   atexit_ctx->exit(thr, pc);
 287   {
 288     ScopedInRtl in_rtl;
 289     DestroyAndFree(atexit_ctx);
 290   }
 291   int status = Finalize(cur_thread());
 292   if (status)
 293     _exit(status);
 294 }
 295
 296 TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
 297   SCOPED_TSAN_INTERCEPTOR(atexit, f);
 298   return atexit_ctx->atexit(thr, pc, f);
 299 }
 300
 301 TSAN_INTERCEPTOR(void, longjmp, void *env, int val) {
 302   SCOPED_TSAN_INTERCEPTOR(longjmp, env, val);
 303   Printf("ThreadSanitizer: longjmp() is not supported\n");
 304   Die();
 305 }
 306
 307 TSAN_INTERCEPTOR(void, siglongjmp, void *env, int val) {
 308   SCOPED_TSAN_INTERCEPTOR(siglongjmp, env, val);
 309   Printf("ThreadSanitizer: siglongjmp() is not supported\n");
 310   Die();
 311 }
 312
 313 TSAN_INTERCEPTOR(void*, malloc, uptr size) {
 314   void *p = 0;
 315   {
 316     SCOPED_INTERCEPTOR_RAW(malloc, size);
 317     p = user_alloc(thr, pc, size);
 318   }
 319   invoke_malloc_hook(p, size);
 320   return p;
 321 }
 322
 323 TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
 324   SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
 325   return user_alloc(thr, pc, sz, align);
 326 }
 327
 328 TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
 329   void *p = 0;
 330   {
 331     SCOPED_INTERCEPTOR_RAW(calloc, size, n);
 332     p = user_alloc(thr, pc, n * size);
 333     if (p) internal_memset(p, 0, n * size);
 334   }
 335   invoke_malloc_hook(p, n * size);
 336   return p;
 337 }
 338
 339 TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
 340   if (p)
 341     invoke_free_hook(p);
 342   {
 343     SCOPED_INTERCEPTOR_RAW(realloc, p, size);
 344     p = user_realloc(thr, pc, p, size);
 345   }
 346   invoke_malloc_hook(p, size);
 347   return p;
 348 }
 349
 350 TSAN_INTERCEPTOR(void, free, void *p) {
 351   if (p == 0)
 352     return;
 353   invoke_free_hook(p);
 354   SCOPED_INTERCEPTOR_RAW(free, p);
 355   user_free(thr, pc, p);
 356 }
 357
 358 TSAN_INTERCEPTOR(void, cfree, void *p) {
 359   if (p == 0)
 360     return;
 361   invoke_free_hook(p);
 362   SCOPED_INTERCEPTOR_RAW(cfree, p);
 363   user_free(thr, pc, p);
 364 }
 365
 366 #define OPERATOR_NEW_BODY(mangled_name) \
 367   void *p = 0; \
 368   {  \
 369     SCOPED_INTERCEPTOR_RAW(mangled_name, size); \
 370     p = user_alloc(thr, pc, size); \
 371   }  \
 372   invoke_malloc_hook(p, size);  \
 373   return p;
 374
 375 void *operator new(__sanitizer::uptr size) {
 376   OPERATOR_NEW_BODY(_Znwm);
 377 }
 378 void *operator new[](__sanitizer::uptr size) {
 379   OPERATOR_NEW_BODY(_Znam);
 380 }
 381 void *operator new(__sanitizer::uptr size, std::nothrow_t const&) {
 382   OPERATOR_NEW_BODY(_ZnwmRKSt9nothrow_t);
 383 }
 384 void *operator new[](__sanitizer::uptr size, std::nothrow_t const&) {
 385   OPERATOR_NEW_BODY(_ZnamRKSt9nothrow_t);
 386 }
 387
 388 #define OPERATOR_DELETE_BODY(mangled_name) \
 389   if (ptr == 0) return;  \
 390   invoke_free_hook(ptr);  \
 391   SCOPED_INTERCEPTOR_RAW(mangled_name, ptr);  \
 392   user_free(thr, pc, ptr);
 393
 394 void operator delete(void *ptr) {
 395   OPERATOR_DELETE_BODY(_ZdlPv);
 396 }
 397 void operator delete[](void *ptr) {
 398   OPERATOR_DELETE_BODY(_ZdlPvRKSt9nothrow_t);
 399 }
 400 void operator delete(void *ptr, std::nothrow_t const&) {
 401   OPERATOR_DELETE_BODY(_ZdaPv);
 402 }
 403 void operator delete[](void *ptr, std::nothrow_t const&) {
 404   OPERATOR_DELETE_BODY(_ZdaPvRKSt9nothrow_t);
 405 }
 406
 407 TSAN_INTERCEPTOR(uptr, strlen, const char *s) {
 408   SCOPED_TSAN_INTERCEPTOR(strlen, s);
 409   uptr len = internal_strlen(s);
 410   MemoryAccessRange(thr, pc, (uptr)s, len + 1, false);
 411   return len;
 412 }
 413
 414 TSAN_INTERCEPTOR(void*, memset, void *dst, int v, uptr size) {
 415   SCOPED_TSAN_INTERCEPTOR(memset, dst, v, size);
 416   MemoryAccessRange(thr, pc, (uptr)dst, size, true);
 417   return internal_memset(dst, v, size);
 418 }
 419
 420 TSAN_INTERCEPTOR(void*, memcpy, void *dst, const void *src, uptr size) {
 421   SCOPED_TSAN_INTERCEPTOR(memcpy, dst, src, size);
 422   MemoryAccessRange(thr, pc, (uptr)dst, size, true);
 423   MemoryAccessRange(thr, pc, (uptr)src, size, false);
 424   return internal_memcpy(dst, src, size);
 425 }
 426
 427 TSAN_INTERCEPTOR(int, memcmp, const void *s1, const void *s2, uptr n) {
 428   SCOPED_TSAN_INTERCEPTOR(memcmp, s1, s2, n);
 429   int res = 0;
 430   uptr len = 0;
 431   for (; len < n; len++) {
 432     if ((res = ((unsigned char*)s1)[len] - ((unsigned char*)s2)[len]))
 433       break;
 434   }
 435   MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
 436   MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
 437   return res;
 438 }
 439
 440 TSAN_INTERCEPTOR(int, strcmp, const char *s1, const char *s2) {
 441   SCOPED_TSAN_INTERCEPTOR(strcmp, s1, s2);
 442   uptr len = 0;
 443   for (; s1[len] && s2[len]; len++) {
 444     if (s1[len] != s2[len])
 445       break;
 446   }
 447   MemoryAccessRange(thr, pc, (uptr)s1, len + 1, false);
 448   MemoryAccessRange(thr, pc, (uptr)s2, len + 1, false);
 449   return s1[len] - s2[len];
 450 }
 451
 452 TSAN_INTERCEPTOR(int, strncmp, const char *s1, const char *s2, uptr n) {
 453   SCOPED_TSAN_INTERCEPTOR(strncmp, s1, s2, n);
 454   uptr len = 0;
 455   for (; len < n && s1[len] && s2[len]; len++) {
 456     if (s1[len] != s2[len])
 457       break;
 458   }
 459   MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
 460   MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
 461   return len == n ? 0 : s1[len] - s2[len];
 462 }
 463
 464 TSAN_INTERCEPTOR(void*, memchr, void *s, int c, uptr n) {
 465   SCOPED_TSAN_INTERCEPTOR(memchr, s, c, n);
 466   void *res = REAL(memchr)(s, c, n);
 467   uptr len = res ? (char*)res - (char*)s + 1 : n;
 468   MemoryAccessRange(thr, pc, (uptr)s, len, false);
 469   return res;
 470 }
 471
 472 TSAN_INTERCEPTOR(void*, memrchr, char *s, int c, uptr n) {
 473   SCOPED_TSAN_INTERCEPTOR(memrchr, s, c, n);
 474   MemoryAccessRange(thr, pc, (uptr)s, n, false);
 475   return REAL(memrchr)(s, c, n);
 476 }
 477
 478 TSAN_INTERCEPTOR(void*, memmove, void *dst, void *src, uptr n) {
 479   SCOPED_TSAN_INTERCEPTOR(memmove, dst, src, n);
 480   MemoryAccessRange(thr, pc, (uptr)dst, n, true);
 481   MemoryAccessRange(thr, pc, (uptr)src, n, false);
 482   return REAL(memmove)(dst, src, n);
 483 }
 484
 485 TSAN_INTERCEPTOR(char*, strchr, char *s, int c) {
 486   SCOPED_TSAN_INTERCEPTOR(strchr, s, c);
 487   char *res = REAL(strchr)(s, c);
 488   uptr len = res ? (char*)res - (char*)s + 1 : internal_strlen(s) + 1;
 489   MemoryAccessRange(thr, pc, (uptr)s, len, false);
 490   return res;
 491 }
 492
 493 TSAN_INTERCEPTOR(char*, strchrnul, char *s, int c) {
 494   SCOPED_TSAN_INTERCEPTOR(strchrnul, s, c);
 495   char *res = REAL(strchrnul)(s, c);
 496   uptr len = (char*)res - (char*)s + 1;
 497   MemoryAccessRange(thr, pc, (uptr)s, len, false);
 498   return res;
 499 }
 500
 501 TSAN_INTERCEPTOR(char*, strrchr, char *s, int c) {
 502   SCOPED_TSAN_INTERCEPTOR(strrchr, s, c);
 503   MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s) + 1, false);
 504   return REAL(strrchr)(s, c);
 505 }
 506
 507 TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) {  // NOLINT
 508   SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);  // NOLINT
 509   uptr srclen = internal_strlen(src);
 510   MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
 511   MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
 512   return REAL(strcpy)(dst, src);  // NOLINT
 513 }
 514
 515 TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
 516   SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
 517   uptr srclen = internal_strnlen(src, n);
 518   MemoryAccessRange(thr, pc, (uptr)dst, n, true);
 519   MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
 520   return REAL(strncpy)(dst, src, n);
 521 }
 522
 523 TSAN_INTERCEPTOR(const char*, strstr, const char *s1, const char *s2) {
 524   SCOPED_TSAN_INTERCEPTOR(strstr, s1, s2);
 525   const char *res = REAL(strstr)(s1, s2);
 526   uptr len1 = internal_strlen(s1);
 527   uptr len2 = internal_strlen(s2);
 528   MemoryAccessRange(thr, pc, (uptr)s1, len1 + 1, false);
 529   MemoryAccessRange(thr, pc, (uptr)s2, len2 + 1, false);
 530   return res;
 531 }
 532
 533 static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
 534   if (*addr) {
 535     if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
 536       if (flags & MAP_FIXED) {
 537         errno = EINVAL;
 538         return false;
 539       } else {
 540         *addr = 0;
 541       }
 542     }
 543   }
 544   return true;
 545 }
 546
 547 TSAN_INTERCEPTOR(void*, mmap, void *addr, long_t sz, int prot,
 548                          int flags, int fd, unsigned off) {
 549   SCOPED_TSAN_INTERCEPTOR(mmap, addr, sz, prot, flags, fd, off);
 550   if (!fix_mmap_addr(&addr, sz, flags))
 551     return MAP_FAILED;
 552   void *res = REAL(mmap)(addr, sz, prot, flags, fd, off);
 553   if (res != MAP_FAILED) {
 554     MemoryResetRange(thr, pc, (uptr)res, sz);
 555   }
 556   return res;
 557 }
 558
 559 TSAN_INTERCEPTOR(void*, mmap64, void *addr, long_t sz, int prot,
 560                            int flags, int fd, u64 off) {
 561   SCOPED_TSAN_INTERCEPTOR(mmap64, addr, sz, prot, flags, fd, off);
 562   if (!fix_mmap_addr(&addr, sz, flags))
 563     return MAP_FAILED;
 564   void *res = REAL(mmap64)(addr, sz, prot, flags, fd, off);
 565   if (res != MAP_FAILED) {
 566     MemoryResetRange(thr, pc, (uptr)res, sz);
 567   }
 568   return res;
 569 }
 570
 571 TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
 572   SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
 573   int res = REAL(munmap)(addr, sz);
 574   return res;
 575 }
 576
 577 TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
 578   SCOPED_TSAN_INTERCEPTOR(memalign, align, sz);
 579   return user_alloc(thr, pc, sz, align);
 580 }
 581
 582 TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
 583   SCOPED_TSAN_INTERCEPTOR(valloc, sz);
 584   return user_alloc(thr, pc, sz, GetPageSizeCached());
 585 }
 586
 587 TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
 588   SCOPED_TSAN_INTERCEPTOR(pvalloc, sz);
 589   sz = RoundUp(sz, GetPageSizeCached());
 590   return user_alloc(thr, pc, sz, GetPageSizeCached());
 591 }
 592
 593 TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
 594   SCOPED_TSAN_INTERCEPTOR(posix_memalign, memptr, align, sz);
 595   *memptr = user_alloc(thr, pc, sz, align);
 596   return 0;
 597 }
 598
 599 // Used in thread-safe function static initialization.
 600 extern "C" int INTERFACE_ATTRIBUTE __cxa_guard_acquire(atomic_uint32_t *g) {
 601   SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
 602   for (;;) {
 603     u32 cmp = atomic_load(g, memory_order_acquire);
 604     if (cmp == 0) {
 605       if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
 606         return 1;
 607     } else if (cmp == 1) {
 608       Acquire(thr, pc, (uptr)g);
 609       return 0;
 610     } else {
 611       internal_sched_yield();
 612     }
 613   }
 614 }
 615
 616 extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_release(atomic_uint32_t *g) {
 617   SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
 618   Release(thr, pc, (uptr)g);
 619   atomic_store(g, 1, memory_order_release);
 620 }
 621
 622 extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_abort(atomic_uint32_t *g) {
 623   SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
 624   atomic_store(g, 0, memory_order_relaxed);
 625 }
 626
 627 static void thread_finalize(void *v) {
 628   uptr iter = (uptr)v;
 629   if (iter > 1) {
 630     if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
 631       Printf("ThreadSanitizer: failed to set thread key\n");
 632       Die();
 633     }
 634     return;
 635   }
 636   {
 637     ScopedInRtl in_rtl;
 638     ThreadState *thr = cur_thread();
 639     ThreadFinish(thr);
 640     SignalContext *sctx = thr->signal_ctx;
 641     if (sctx) {
 642       thr->signal_ctx = 0;
 643       UnmapOrDie(sctx, sizeof(*sctx));
 644     }
 645   }
 646 }
 647
 648
 649 struct ThreadParam {
 650   void* (*callback)(void *arg);
 651   void *param;
 652   atomic_uintptr_t tid;
 653 };
 654
 655 extern "C" void *__tsan_thread_start_func(void *arg) {
 656   ThreadParam *p = (ThreadParam*)arg;
 657   void* (*callback)(void *arg) = p->callback;
 658   void *param = p->param;
 659   int tid = 0;
 660   {
 661     ThreadState *thr = cur_thread();
 662     ScopedInRtl in_rtl;
 663     if (pthread_setspecific(g_thread_finalize_key, (void*)4)) {
 664       Printf("ThreadSanitizer: failed to set thread key\n");
 665       Die();
 666     }
 667     while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
 668       pthread_yield();
 669     atomic_store(&p->tid, 0, memory_order_release);
 670     ThreadStart(thr, tid, GetTid());
 671     CHECK_EQ(thr->in_rtl, 1);
 672   }
 673   void *res = callback(param);
 674   // Prevent the callback from being tail called,
 675   // it mixes up stack traces.
 676   volatile int foo = 42;
 677   foo++;
 678   return res;
 679 }
 680
 681 TSAN_INTERCEPTOR(int, pthread_create,
 682     void *th, void *attr, void *(*callback)(void*), void * param) {
 683   SCOPED_TSAN_INTERCEPTOR(pthread_create, th, attr, callback, param);
 684   pthread_attr_t myattr;
 685   if (attr == 0) {
 686     pthread_attr_init(&myattr);
 687     attr = &myattr;
 688   }
 689   int detached = 0;
 690   pthread_attr_getdetachstate(attr, &detached);
 691   uptr stacksize = 0;
 692   pthread_attr_getstacksize(attr, &stacksize);
 693   // We place the huge ThreadState object into TLS, account for that.
 694   const uptr minstacksize = GetTlsSize() + 128*1024;
 695   if (stacksize < minstacksize) {
 696     DPrintf("ThreadSanitizer: stacksize %zu->%zu\n", stacksize, minstacksize);
 697     pthread_attr_setstacksize(attr, minstacksize);
 698   }
 699   ThreadParam p;
 700   p.callback = callback;
 701   p.param = param;
 702   atomic_store(&p.tid, 0, memory_order_relaxed);
 703   int res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
 704   if (res == 0) {
 705     int tid = ThreadCreate(thr, pc, *(uptr*)th, detached);
 706     CHECK_NE(tid, 0);
 707     atomic_store(&p.tid, tid, memory_order_release);
 708     while (atomic_load(&p.tid, memory_order_acquire) != 0)
 709       pthread_yield();
 710   }
 711   if (attr == &myattr)
 712     pthread_attr_destroy(&myattr);
 713   return res;
 714 }
 715
 716 TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
 717   SCOPED_TSAN_INTERCEPTOR(pthread_join, th, ret);
 718   int tid = ThreadTid(thr, pc, (uptr)th);
 719   int res = BLOCK_REAL(pthread_join)(th, ret);
 720   if (res == 0) {
 721     ThreadJoin(thr, pc, tid);
 722   }
 723   return res;
 724 }
 725
 726 TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
 727   SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
 728   int tid = ThreadTid(thr, pc, (uptr)th);
 729   int res = REAL(pthread_detach)(th);
 730   if (res == 0) {
 731     ThreadDetach(thr, pc, tid);
 732   }
 733   return res;
 734 }
 735
 736 TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
 737   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
 738   int res = REAL(pthread_mutex_init)(m, a);
 739   if (res == 0) {
 740     bool recursive = false;
 741     if (a) {
 742       int type = 0;
 743       if (pthread_mutexattr_gettype(a, &type) == 0)
 744         recursive = (type == PTHREAD_MUTEX_RECURSIVE
 745             || type == PTHREAD_MUTEX_RECURSIVE_NP);
 746     }
 747     MutexCreate(thr, pc, (uptr)m, false, recursive, false);
 748   }
 749   return res;
 750 }
 751
 752 TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
 753   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
 754   int res = REAL(pthread_mutex_destroy)(m);
 755   if (res == 0 || res == EBUSY) {
 756     MutexDestroy(thr, pc, (uptr)m);
 757   }
 758   return res;
 759 }
 760
 761 TSAN_INTERCEPTOR(int, pthread_mutex_lock, void *m) {
 762   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_lock, m);
 763   int res = REAL(pthread_mutex_lock)(m);
 764   if (res == 0) {
 765     MutexLock(thr, pc, (uptr)m);
 766   }
 767   return res;
 768 }
 769
 770 TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
 771   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
 772   int res = REAL(pthread_mutex_trylock)(m);
 773   if (res == 0) {
 774     MutexLock(thr, pc, (uptr)m);
 775   }
 776   return res;
 777 }
 778
 779 TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
 780   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
 781   int res = REAL(pthread_mutex_timedlock)(m, abstime);
 782   if (res == 0) {
 783     MutexLock(thr, pc, (uptr)m);
 784   }
 785   return res;
 786 }
 787
 788 TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {
 789   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_unlock, m);
 790   MutexUnlock(thr, pc, (uptr)m);
 791   int res = REAL(pthread_mutex_unlock)(m);
 792   return res;
 793 }
 794
 795 TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
 796   SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
 797   int res = REAL(pthread_spin_init)(m, pshared);
 798   if (res == 0) {
 799     MutexCreate(thr, pc, (uptr)m, false, false, false);
 800   }
 801   return res;
 802 }
 803
 804 TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
 805   SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
 806   int res = REAL(pthread_spin_destroy)(m);
 807   if (res == 0) {
 808     MutexDestroy(thr, pc, (uptr)m);
 809   }
 810   return res;
 811 }
 812
 813 TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
 814   SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
 815   int res = REAL(pthread_spin_lock)(m);
 816   if (res == 0) {
 817     MutexLock(thr, pc, (uptr)m);
 818   }
 819   return res;
 820 }
 821
 822 TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
 823   SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
 824   int res = REAL(pthread_spin_trylock)(m);
 825   if (res == 0) {
 826     MutexLock(thr, pc, (uptr)m);
 827   }
 828   return res;
 829 }
 830
 831 TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
 832   SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
 833   MutexUnlock(thr, pc, (uptr)m);
 834   int res = REAL(pthread_spin_unlock)(m);
 835   return res;
 836 }
 837
 838 TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
 839   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
 840   int res = REAL(pthread_rwlock_init)(m, a);
 841   if (res == 0) {
 842     MutexCreate(thr, pc, (uptr)m, true, false, false);
 843   }
 844   return res;
 845 }
 846
 847 TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
 848   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
 849   int res = REAL(pthread_rwlock_destroy)(m);
 850   if (res == 0) {
 851     MutexDestroy(thr, pc, (uptr)m);
 852   }
 853   return res;
 854 }
 855
 856 TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
 857   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
 858   int res = REAL(pthread_rwlock_rdlock)(m);
 859   if (res == 0) {
 860     MutexReadLock(thr, pc, (uptr)m);
 861   }
 862   return res;
 863 }
 864
 865 TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
 866   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
 867   int res = REAL(pthread_rwlock_tryrdlock)(m);
 868   if (res == 0) {
 869     MutexReadLock(thr, pc, (uptr)m);
 870   }
 871   return res;
 872 }
 873
 874 TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
 875   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
 876   int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
 877   if (res == 0) {
 878     MutexReadLock(thr, pc, (uptr)m);
 879   }
 880   return res;
 881 }
 882
 883 TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
 884   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
 885   int res = REAL(pthread_rwlock_wrlock)(m);
 886   if (res == 0) {
 887     MutexLock(thr, pc, (uptr)m);
 888   }
 889   return res;
 890 }
 891
 892 TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
 893   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
 894   int res = REAL(pthread_rwlock_trywrlock)(m);
 895   if (res == 0) {
 896     MutexLock(thr, pc, (uptr)m);
 897   }
 898   return res;
 899 }
 900
 901 TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
 902   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
 903   int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
 904   if (res == 0) {
 905     MutexLock(thr, pc, (uptr)m);
 906   }
 907   return res;
 908 }
 909
 910 TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
 911   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
 912   MutexReadOrWriteUnlock(thr, pc, (uptr)m);
 913   int res = REAL(pthread_rwlock_unlock)(m);
 914   return res;
 915 }
 916
 917 // libpthread.so contains several versions of pthread_cond_init symbol.
 918 // When we just dlsym() it, we get the wrong (old) version.
 919 /*
 920 TSAN_INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
 921   SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, c, a);
 922   int res = REAL(pthread_cond_init)(c, a);
 923   return res;
 924 }
 925 */
 926
 927 TSAN_INTERCEPTOR(int, pthread_cond_destroy, void *c) {
 928   SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, c);
 929   int res = REAL(pthread_cond_destroy)(c);
 930   return res;
 931 }
 932
 933 TSAN_INTERCEPTOR(int, pthread_cond_signal, void *c) {
 934   SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, c);
 935   int res = REAL(pthread_cond_signal)(c);
 936   return res;
 937 }
 938
 939 TSAN_INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
 940   SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, c);
 941   int res = REAL(pthread_cond_broadcast)(c);
 942   return res;
 943 }
 944
 945 TSAN_INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
 946   SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, c, m);
 947   MutexUnlock(thr, pc, (uptr)m);
 948   int res = REAL(pthread_cond_wait)(c, m);
 949   MutexLock(thr, pc, (uptr)m);
 950   return res;
 951 }
 952
 953 TSAN_INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m, void *abstime) {
 954   SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, c, m, abstime);
 955   MutexUnlock(thr, pc, (uptr)m);
 956   int res = REAL(pthread_cond_timedwait)(c, m, abstime);
 957   MutexLock(thr, pc, (uptr)m);
 958   return res;
 959 }
 960
 961 TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
 962   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
 963   MemoryWrite1Byte(thr, pc, (uptr)b);
 964   int res = REAL(pthread_barrier_init)(b, a, count);
 965   return res;
 966 }
 967
 968 TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
 969   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
 970   MemoryWrite1Byte(thr, pc, (uptr)b);
 971   int res = REAL(pthread_barrier_destroy)(b);
 972   return res;
 973 }
 974
 975 TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
 976   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
 977   Release(thr, pc, (uptr)b);
 978   MemoryRead1Byte(thr, pc, (uptr)b);
 979   int res = REAL(pthread_barrier_wait)(b);
 980   MemoryRead1Byte(thr, pc, (uptr)b);
 981   if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
 982     Acquire(thr, pc, (uptr)b);
 983   }
 984   return res;
 985 }
 986
 987 TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
 988   SCOPED_TSAN_INTERCEPTOR(pthread_once, o, f);
 989   if (o == 0 || f == 0)
 990     return EINVAL;
 991   atomic_uint32_t *a = static_cast<atomic_uint32_t*>(o);
 992   u32 v = atomic_load(a, memory_order_acquire);
 993   if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
 994                                                memory_order_relaxed)) {
 995     const int old_in_rtl = thr->in_rtl;
 996     thr->in_rtl = 0;
 997     (*f)();
 998     CHECK_EQ(thr->in_rtl, 0);
 999     thr->in_rtl = old_in_rtl;
1000     Release(thr, pc, (uptr)o);
1001     atomic_store(a, 2, memory_order_release);
1002   } else {
1003     while (v != 2) {
1004       pthread_yield();
1005       v = atomic_load(a, memory_order_acquire);
1006     }
1007     Acquire(thr, pc, (uptr)o);
1008   }
1009   return 0;
1010 }
1011
1012 TSAN_INTERCEPTOR(int, sem_init, void *s, int pshared, unsigned value) {
1013   SCOPED_TSAN_INTERCEPTOR(sem_init, s, pshared, value);
1014   int res = REAL(sem_init)(s, pshared, value);
1015   return res;
1016 }
1017
1018 TSAN_INTERCEPTOR(int, sem_destroy, void *s) {
1019   SCOPED_TSAN_INTERCEPTOR(sem_destroy, s);
1020   int res = REAL(sem_destroy)(s);
1021   return res;
1022 }
1023
1024 TSAN_INTERCEPTOR(int, sem_wait, void *s) {
1025   SCOPED_TSAN_INTERCEPTOR(sem_wait, s);
1026   int res = BLOCK_REAL(sem_wait)(s);
1027   if (res == 0) {
1028     Acquire(thr, pc, (uptr)s);
1029   }
1030   return res;
1031 }
1032
1033 TSAN_INTERCEPTOR(int, sem_trywait, void *s) {
1034   SCOPED_TSAN_INTERCEPTOR(sem_trywait, s);
1035   int res = BLOCK_REAL(sem_trywait)(s);
1036   if (res == 0) {
1037     Acquire(thr, pc, (uptr)s);
1038   }
1039   return res;
1040 }
1041
1042 TSAN_INTERCEPTOR(int, sem_timedwait, void *s, void *abstime) {
1043   SCOPED_TSAN_INTERCEPTOR(sem_timedwait, s, abstime);
1044   int res = BLOCK_REAL(sem_timedwait)(s, abstime);
1045   if (res == 0) {
1046     Acquire(thr, pc, (uptr)s);
1047   }
1048   return res;
1049 }
1050
1051 TSAN_INTERCEPTOR(int, sem_post, void *s) {
1052   SCOPED_TSAN_INTERCEPTOR(sem_post, s);
1053   Release(thr, pc, (uptr)s);
1054   int res = REAL(sem_post)(s);
1055   return res;
1056 }
1057
1058 TSAN_INTERCEPTOR(int, sem_getvalue, void *s, int *sval) {
1059   SCOPED_TSAN_INTERCEPTOR(sem_getvalue, s, sval);
1060   int res = REAL(sem_getvalue)(s, sval);
1061   if (res == 0) {
1062     Acquire(thr, pc, (uptr)s);
1063   }
1064   return res;
1065 }
1066
1067 TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1068   SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1069   int fd = REAL(open)(name, flags, mode);
1070   if (fd >= 0)
1071     FdFileCreate(thr, pc, fd);
1072   return fd;
1073 }
1074
1075 TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
1076   SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
1077   int fd = REAL(open64)(name, flags, mode);
1078   if (fd >= 0)
1079     FdFileCreate(thr, pc, fd);
1080   return fd;
1081 }
1082
1083 TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1084   SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1085   int fd = REAL(creat)(name, mode);
1086   if (fd >= 0)
1087     FdFileCreate(thr, pc, fd);
1088   return fd;
1089 }
1090
1091 TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1092   SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1093   int fd = REAL(creat64)(name, mode);
1094   if (fd >= 0)
1095     FdFileCreate(thr, pc, fd);
1096   return fd;
1097 }
1098
1099 TSAN_INTERCEPTOR(int, dup, int oldfd) {
1100   SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1101   int newfd = REAL(dup)(oldfd);
1102   if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1103     FdDup(thr, pc, oldfd, newfd);
1104   return newfd;
1105 }
1106
1107 TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1108   SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1109   int newfd2 = REAL(dup2)(oldfd, newfd);
1110   if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1111     FdDup(thr, pc, oldfd, newfd2);
1112   return newfd2;
1113 }
1114
1115 TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1116   SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1117   int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1118   if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1119     FdDup(thr, pc, oldfd, newfd2);
1120   return newfd2;
1121 }
1122
1123 TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1124   SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1125   int fd = REAL(eventfd)(initval, flags);
1126   if (fd >= 0)
1127     FdEventCreate(thr, pc, fd);
1128   return fd;
1129 }
1130
1131 TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1132   SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1133   if (fd >= 0)
1134     FdClose(thr, pc, fd);
1135   fd = REAL(signalfd)(fd, mask, flags);
1136   if (fd >= 0)
1137     FdSignalCreate(thr, pc, fd);
1138   return fd;
1139 }
1140
1141 TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1142   SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1143   int fd = REAL(inotify_init)(fake);
1144   if (fd >= 0)
1145     FdInotifyCreate(thr, pc, fd);
1146   return fd;
1147 }
1148
1149 TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1150   SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1151   int fd = REAL(inotify_init1)(flags);
1152   if (fd >= 0)
1153     FdInotifyCreate(thr, pc, fd);
1154   return fd;
1155 }
1156
1157 TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1158   SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1159   int fd = REAL(socket)(domain, type, protocol);
1160   if (fd >= 0)
1161     FdSocketCreate(thr, pc, fd);
1162   return fd;
1163 }
1164
1165 TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1166   SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1167   int res = REAL(socketpair)(domain, type, protocol, fd);
1168   if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1169     FdPipeCreate(thr, pc, fd[0], fd[1]);
1170   return res;
1171 }
1172
1173 TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1174   SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1175   FdSocketConnecting(thr, pc, fd);
1176   int res = REAL(connect)(fd, addr, addrlen);
1177   if (res == 0 && fd >= 0)
1178     FdSocketConnect(thr, pc, fd);
1179   return res;
1180 }
1181
1182 TSAN_INTERCEPTOR(int, accept, int fd, void *addr, unsigned *addrlen) {
1183   SCOPED_TSAN_INTERCEPTOR(accept, fd, addr, addrlen);
1184   int fd2 = REAL(accept)(fd, addr, addrlen);
1185   if (fd >= 0 && fd2 >= 0)
1186     FdSocketAccept(thr, pc, fd, fd2);
1187   return fd2;
1188 }
1189
1190 TSAN_INTERCEPTOR(int, accept4, int fd, void *addr, unsigned *addrlen, int f) {
1191   SCOPED_TSAN_INTERCEPTOR(accept4, fd, addr, addrlen, f);
1192   int fd2 = REAL(accept4)(fd, addr, addrlen, f);
1193   if (fd >= 0 && fd2 >= 0)
1194     FdSocketAccept(thr, pc, fd, fd2);
1195   return fd2;
1196 }
1197
1198 TSAN_INTERCEPTOR(int, epoll_create, int size) {
1199   SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1200   int fd = REAL(epoll_create)(size);
1201   if (fd >= 0)
1202     FdPollCreate(thr, pc, fd);
1203   return fd;
1204 }
1205
1206 TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1207   SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1208   int fd = REAL(epoll_create1)(flags);
1209   if (fd >= 0)
1210     FdPollCreate(thr, pc, fd);
1211   return fd;
1212 }
1213
1214 TSAN_INTERCEPTOR(int, close, int fd) {
1215   SCOPED_TSAN_INTERCEPTOR(close, fd);
1216   if (fd >= 0)
1217     FdClose(thr, pc, fd);
1218   return REAL(close)(fd);
1219 }
1220
1221 TSAN_INTERCEPTOR(int, __close, int fd) {
1222   SCOPED_TSAN_INTERCEPTOR(__close, fd);
1223   if (fd >= 0)
1224     FdClose(thr, pc, fd);
1225   return REAL(__close)(fd);
1226 }
1227
1228 TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1229   SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1230   int res = REAL(pipe)(pipefd);
1231   if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1232     FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1233   return res;
1234 }
1235
1236 TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1237   SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1238   int res = REAL(pipe2)(pipefd, flags);
1239   if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1240     FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1241   return res;
1242 }
1243
1244 TSAN_INTERCEPTOR(long_t, read, int fd, void *buf, long_t sz) {
1245   SCOPED_TSAN_INTERCEPTOR(read, fd, buf, sz);
1246   int res = REAL(read)(fd, buf, sz);
1247   if (res >= 0 && fd >= 0) {
1248     FdAcquire(thr, pc, fd);
1249   }
1250   return res;
1251 }
1252
1253 TSAN_INTERCEPTOR(long_t, pread, int fd, void *buf, long_t sz, unsigned off) {
1254   SCOPED_TSAN_INTERCEPTOR(pread, fd, buf, sz, off);
1255   int res = REAL(pread)(fd, buf, sz, off);
1256   if (res >= 0 && fd >= 0) {
1257     FdAcquire(thr, pc, fd);
1258   }
1259   return res;
1260 }
1261
1262 TSAN_INTERCEPTOR(long_t, pread64, int fd, void *buf, long_t sz, u64 off) {
1263   SCOPED_TSAN_INTERCEPTOR(pread64, fd, buf, sz, off);
1264   int res = REAL(pread64)(fd, buf, sz, off);
1265   if (res >= 0 && fd >= 0) {
1266     FdAcquire(thr, pc, fd);
1267   }
1268   return res;
1269 }
1270
1271 TSAN_INTERCEPTOR(long_t, readv, int fd, void *vec, int cnt) {
1272   SCOPED_TSAN_INTERCEPTOR(readv, fd, vec, cnt);
1273   int res = REAL(readv)(fd, vec, cnt);
1274   if (res >= 0 && fd >= 0) {
1275     FdAcquire(thr, pc, fd);
1276   }
1277   return res;
1278 }
1279
1280 TSAN_INTERCEPTOR(long_t, preadv64, int fd, void *vec, int cnt, u64 off) {
1281   SCOPED_TSAN_INTERCEPTOR(preadv64, fd, vec, cnt, off);
1282   int res = REAL(preadv64)(fd, vec, cnt, off);
1283   if (res >= 0 && fd >= 0) {
1284     FdAcquire(thr, pc, fd);
1285   }
1286   return res;
1287 }
1288
1289 TSAN_INTERCEPTOR(long_t, write, int fd, void *buf, long_t sz) {
1290   SCOPED_TSAN_INTERCEPTOR(write, fd, buf, sz);
1291   if (fd >= 0)
1292     FdRelease(thr, pc, fd);
1293   int res = REAL(write)(fd, buf, sz);
1294   return res;
1295 }
1296
1297 TSAN_INTERCEPTOR(long_t, pwrite, int fd, void *buf, long_t sz, unsigned off) {
1298   SCOPED_TSAN_INTERCEPTOR(pwrite, fd, buf, sz, off);
1299   if (fd >= 0)
1300     FdRelease(thr, pc, fd);
1301   int res = REAL(pwrite)(fd, buf, sz, off);
1302   return res;
1303 }
1304
1305 TSAN_INTERCEPTOR(long_t, pwrite64, int fd, void *buf, long_t sz, u64 off) {
1306   SCOPED_TSAN_INTERCEPTOR(pwrite64, fd, buf, sz, off);
1307   if (fd >= 0)
1308     FdRelease(thr, pc, fd);
1309   int res = REAL(pwrite64)(fd, buf, sz, off);
1310   return res;
1311 }
1312
1313 TSAN_INTERCEPTOR(long_t, writev, int fd, void *vec, int cnt) {
1314   SCOPED_TSAN_INTERCEPTOR(writev, fd, vec, cnt);
1315   if (fd >= 0)
1316     FdRelease(thr, pc, fd);
1317   int res = REAL(writev)(fd, vec, cnt);
1318   return res;
1319 }
1320
1321 TSAN_INTERCEPTOR(long_t, pwritev64, int fd, void *vec, int cnt, u64 off) {
1322   SCOPED_TSAN_INTERCEPTOR(pwritev64, fd, vec, cnt, off);
1323   if (fd >= 0)
1324     FdRelease(thr, pc, fd);
1325   int res = REAL(pwritev64)(fd, vec, cnt, off);
1326   return res;
1327 }
1328
1329 TSAN_INTERCEPTOR(long_t, send, int fd, void *buf, long_t len, int flags) {
1330   SCOPED_TSAN_INTERCEPTOR(send, fd, buf, len, flags);
1331   if (fd >= 0)
1332     FdRelease(thr, pc, fd);
1333   int res = REAL(send)(fd, buf, len, flags);
1334   return res;
1335 }
1336
1337 TSAN_INTERCEPTOR(long_t, sendmsg, int fd, void *msg, int flags) {
1338   SCOPED_TSAN_INTERCEPTOR(sendmsg, fd, msg, flags);
1339   if (fd >= 0)
1340     FdRelease(thr, pc, fd);
1341   int res = REAL(sendmsg)(fd, msg, flags);
1342   return res;
1343 }
1344
1345 TSAN_INTERCEPTOR(long_t, recv, int fd, void *buf, long_t len, int flags) {
1346   SCOPED_TSAN_INTERCEPTOR(recv, fd, buf, len, flags);
1347   int res = REAL(recv)(fd, buf, len, flags);
1348   if (res >= 0 && fd >= 0) {
1349     FdAcquire(thr, pc, fd);
1350   }
1351   return res;
1352 }
1353
1354 TSAN_INTERCEPTOR(long_t, recvmsg, int fd, void *msg, int flags) {
1355   SCOPED_TSAN_INTERCEPTOR(recvmsg, fd, msg, flags);
1356   int res = REAL(recvmsg)(fd, msg, flags);
1357   if (res >= 0 && fd >= 0) {
1358     FdAcquire(thr, pc, fd);
1359   }
1360   return res;
1361 }
1362
1363 TSAN_INTERCEPTOR(int, unlink, char *path) {
1364   SCOPED_TSAN_INTERCEPTOR(unlink, path);
1365   Release(thr, pc, File2addr(path));
1366   int res = REAL(unlink)(path);
1367   return res;
1368 }
1369
1370 TSAN_INTERCEPTOR(void*, fopen, char *path, char *mode) {
1371   SCOPED_TSAN_INTERCEPTOR(fopen, path, mode);
1372   void *res = REAL(fopen)(path, mode);
1373   Acquire(thr, pc, File2addr(path));
1374   if (res) {
1375     int fd = fileno_unlocked(res);
1376     if (fd >= 0)
1377       FdFileCreate(thr, pc, fd);
1378   }
1379   return res;
1380 }
1381
1382 TSAN_INTERCEPTOR(void*, freopen, char *path, char *mode, void *stream) {
1383   SCOPED_TSAN_INTERCEPTOR(freopen, path, mode, stream);
1384   if (stream) {
1385     int fd = fileno_unlocked(stream);
1386     if (fd >= 0)
1387       FdClose(thr, pc, fd);
1388   }
1389   void *res = REAL(freopen)(path, mode, stream);
1390   Acquire(thr, pc, File2addr(path));
1391   if (res) {
1392     int fd = fileno_unlocked(res);
1393     if (fd >= 0)
1394       FdFileCreate(thr, pc, fd);
1395   }
1396   return res;
1397 }
1398
1399 TSAN_INTERCEPTOR(int, fclose, void *stream) {
1400   {
1401     SCOPED_TSAN_INTERCEPTOR(fclose, stream);
1402     if (stream) {
1403       int fd = fileno_unlocked(stream);
1404       if (fd >= 0)
1405         FdClose(thr, pc, fd);
1406     }
1407   }
1408   return REAL(fclose)(stream);
1409 }
1410
1411 TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1412   {
1413     SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1414     MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1415   }
1416   return REAL(fread)(ptr, size, nmemb, f);
1417 }
1418
1419 TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1420   {
1421     SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1422     MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1423   }
1424   return REAL(fwrite)(p, size, nmemb, f);
1425 }
1426
1427 TSAN_INTERCEPTOR(int, puts, const char *s) {
1428   SCOPED_TSAN_INTERCEPTOR(puts, s);
1429   MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1430   return REAL(puts)(s);
1431 }
1432
1433 TSAN_INTERCEPTOR(int, rmdir, char *path) {
1434   SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1435   Release(thr, pc, Dir2addr(path));
1436   int res = REAL(rmdir)(path);
1437   return res;
1438 }
1439
1440 TSAN_INTERCEPTOR(void*, opendir, char *path) {
1441   SCOPED_TSAN_INTERCEPTOR(opendir, path);
1442   void *res = REAL(opendir)(path);
1443   if (res != 0)
1444     Acquire(thr, pc, Dir2addr(path));
1445   return res;
1446 }
1447
1448 TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1449   SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1450   if (op == EPOLL_CTL_ADD && epfd >= 0) {
1451     FdRelease(thr, pc, epfd);
1452   }
1453   int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1454   FdAccess(thr, pc, fd);
1455   return res;
1456 }
1457
1458 TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1459   SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1460   int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1461   if (res > 0 && epfd >= 0) {
1462     FdAcquire(thr, pc, epfd);
1463   }
1464   return res;
1465 }
1466
1467 TSAN_INTERCEPTOR(int, poll, void *fds, long_t nfds, int timeout) {
1468   SCOPED_TSAN_INTERCEPTOR(poll, fds, nfds, timeout);
1469   int res = BLOCK_REAL(poll)(fds, nfds, timeout);
1470   return res;
1471 }
1472
1473 static void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1474     my_siginfo_t *info, void *ctx) {
1475   ThreadState *thr = cur_thread();
1476   SignalContext *sctx = SigCtx(thr);
1477   // Don't mess with synchronous signals.
1478   if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1479       sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE ||
1480       // If we are sending signal to ourselves, we must process it now.
1481       (sctx && sig == sctx->int_signal_send) ||
1482       // If we are in blocking function, we can safely process it now
1483       // (but check if we are in a recursive interceptor,
1484       // i.e. pthread_join()->munmap()).
1485       (sctx && sctx->in_blocking_func == 1 && thr->in_rtl == 1)) {
1486     CHECK(thr->in_rtl == 0 || thr->in_rtl == 1);
1487     int in_rtl = thr->in_rtl;
1488     thr->in_rtl = 0;
1489     CHECK_EQ(thr->in_signal_handler, false);
1490     thr->in_signal_handler = true;
1491     if (sigact)
1492       sigactions[sig].sa_sigaction(sig, info, ctx);
1493     else
1494       sigactions[sig].sa_handler(sig);
1495     CHECK_EQ(thr->in_signal_handler, true);
1496     thr->in_signal_handler = false;
1497     thr->in_rtl = in_rtl;
1498     return;
1499   }
1500
1501   if (sctx == 0)
1502     return;
1503   SignalDesc *signal = &sctx->pending_signals[sig];
1504   if (signal->armed == false) {
1505     signal->armed = true;
1506     signal->sigaction = sigact;
1507     if (info)
1508       internal_memcpy(&signal->siginfo, info, sizeof(*info));
1509     if (ctx)
1510       internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1511     sctx->pending_signal_count++;
1512   }
1513 }
1514
1515 static void rtl_sighandler(int sig) {
1516   rtl_generic_sighandler(false, sig, 0, 0);
1517 }
1518
1519 static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1520   rtl_generic_sighandler(true, sig, info, ctx);
1521 }
1522
1523 TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1524   SCOPED_TSAN_INTERCEPTOR(sigaction, sig, act, old);
1525   if (old)
1526     internal_memcpy(old, &sigactions[sig], sizeof(*old));
1527   if (act == 0)
1528     return 0;
1529   internal_memcpy(&sigactions[sig], act, sizeof(*act));
1530   sigaction_t newact;
1531   internal_memcpy(&newact, act, sizeof(newact));
1532   sigfillset(&newact.sa_mask);
1533   if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1534     if (newact.sa_flags & SA_SIGINFO)
1535       newact.sa_sigaction = rtl_sigaction;
1536     else
1537       newact.sa_handler = rtl_sighandler;
1538   }
1539   int res = REAL(sigaction)(sig, &newact, 0);
1540   return res;
1541 }
1542
1543 TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1544   sigaction_t act;
1545   act.sa_handler = h;
1546   REAL(memset)(&act.sa_mask, -1, sizeof(act.sa_mask));
1547   act.sa_flags = 0;
1548   sigaction_t old;
1549   int res = sigaction(sig, &act, &old);
1550   if (res)
1551     return SIG_ERR;
1552   return old.sa_handler;
1553 }
1554
1555 TSAN_INTERCEPTOR(int, raise, int sig) {
1556   SCOPED_TSAN_INTERCEPTOR(raise, sig);
1557   SignalContext *sctx = SigCtx(thr);
1558   CHECK_NE(sctx, 0);
1559   int prev = sctx->int_signal_send;
1560   sctx->int_signal_send = sig;
1561   int res = REAL(raise)(sig);
1562   CHECK_EQ(sctx->int_signal_send, sig);
1563   sctx->int_signal_send = prev;
1564   return res;
1565 }
1566
1567 TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1568   SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1569   SignalContext *sctx = SigCtx(thr);
1570   CHECK_NE(sctx, 0);
1571   int prev = sctx->int_signal_send;
1572   if (pid == GetPid()) {
1573     sctx->int_signal_send = sig;
1574   }
1575   int res = REAL(kill)(pid, sig);
1576   if (pid == GetPid()) {
1577     CHECK_EQ(sctx->int_signal_send, sig);
1578     sctx->int_signal_send = prev;
1579   }
1580   return res;
1581 }
1582
1583 TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1584   SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1585   SignalContext *sctx = SigCtx(thr);
1586   CHECK_NE(sctx, 0);
1587   int prev = sctx->int_signal_send;
1588   if (tid == pthread_self()) {
1589     sctx->int_signal_send = sig;
1590   }
1591   int res = REAL(pthread_kill)(tid, sig);
1592   if (tid == pthread_self()) {
1593     CHECK_EQ(sctx->int_signal_send, sig);
1594     sctx->int_signal_send = prev;
1595   }
1596   return res;
1597 }
1598
1599 TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
1600   SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
1601   // It's intercepted merely to process pending signals.
1602   return REAL(gettimeofday)(tv, tz);
1603 }
1604
1605 // Linux kernel has a bug that leads to kernel deadlock if a process
1606 // maps TBs of memory and then calls mlock().
1607 static void MlockIsUnsupported() {
1608   static atomic_uint8_t printed;
1609   if (atomic_exchange(&printed, 1, memory_order_relaxed))
1610     return;
1611   Printf("INFO: ThreadSanitizer ignores mlock/mlockall/munlock/munlockall\n");
1612 }
1613
1614 TSAN_INTERCEPTOR(int, mlock, const void *addr, uptr len) {
1615   MlockIsUnsupported();
1616   return 0;
1617 }
1618
1619 TSAN_INTERCEPTOR(int, munlock, const void *addr, uptr len) {
1620   MlockIsUnsupported();
1621   return 0;
1622 }
1623
1624 TSAN_INTERCEPTOR(int, mlockall, int flags) {
1625   MlockIsUnsupported();
1626   return 0;
1627 }
1628
1629 TSAN_INTERCEPTOR(int, munlockall, void) {
1630   MlockIsUnsupported();
1631   return 0;
1632 }
1633
1634 TSAN_INTERCEPTOR(int, fork, int fake) {
1635   SCOPED_TSAN_INTERCEPTOR(fork, fake);
1636   // It's intercepted merely to process pending signals.
1637   int pid = REAL(fork)(fake);
1638   if (pid == 0) {
1639     // child
1640     FdOnFork(thr, pc);
1641   } else if (pid > 0) {
1642     // parent
1643   }
1644   return pid;
1645 }
1646
1647 namespace __tsan {
1648
1649 void ProcessPendingSignals(ThreadState *thr) {
1650   CHECK_EQ(thr->in_rtl, 0);
1651   SignalContext *sctx = SigCtx(thr);
1652   if (sctx == 0 || sctx->pending_signal_count == 0 || thr->in_signal_handler)
1653     return;
1654   Context *ctx = CTX();
1655   thr->in_signal_handler = true;
1656   sctx->pending_signal_count = 0;
1657   // These are too big for stack.
1658   static THREADLOCAL sigset_t emptyset, oldset;
1659   sigfillset(&emptyset);
1660   pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
1661   for (int sig = 0; sig < kSigCount; sig++) {
1662     SignalDesc *signal = &sctx->pending_signals[sig];
1663     if (signal->armed) {
1664       signal->armed = false;
1665       if (sigactions[sig].sa_handler != SIG_DFL
1666           && sigactions[sig].sa_handler != SIG_IGN) {
1667         // Insure that the handler does not spoil errno.
1668         const int saved_errno = errno;
1669         errno = 0;
1670         if (signal->sigaction)
1671           sigactions[sig].sa_sigaction(sig, &signal->siginfo, &signal->ctx);
1672         else
1673           sigactions[sig].sa_handler(sig);
1674         if (flags()->report_bugs && errno != 0) {
1675           ScopedInRtl in_rtl;
1676           __tsan::StackTrace stack;
1677           uptr pc = signal->sigaction ?
1678               (uptr)sigactions[sig].sa_sigaction :
1679               (uptr)sigactions[sig].sa_handler;
1680           stack.Init(&pc, 1);
1681           ScopedReport rep(ReportTypeErrnoInSignal);
1682           if (!IsFiredSuppression(ctx, rep, stack)) {
1683             rep.AddStack(&stack);
1684             OutputReport(ctx, rep, rep.GetReport()->stacks[0]);
1685           }
1686         }
1687         errno = saved_errno;
1688       }
1689     }
1690   }
1691   pthread_sigmask(SIG_SETMASK, &oldset, 0);
1692   CHECK_EQ(thr->in_signal_handler, true);
1693   thr->in_signal_handler = false;
1694 }
1695
1696 static void unreachable() {
1697   Printf("FATAL: ThreadSanitizer: unreachable called\n");
1698   Die();
1699 }
1700
1701 void InitializeInterceptors() {
1702   CHECK_GT(cur_thread()->in_rtl, 0);
1703
1704   // We need to setup it early, because functions like dlsym() can call it.
1705   REAL(memset) = internal_memset;
1706   REAL(memcpy) = internal_memcpy;
1707   REAL(memcmp) = internal_memcmp;
1708
1709   TSAN_INTERCEPT(longjmp);
1710   TSAN_INTERCEPT(siglongjmp);
1711
1712   TSAN_INTERCEPT(malloc);
1713   TSAN_INTERCEPT(__libc_memalign);
1714   TSAN_INTERCEPT(calloc);
1715   TSAN_INTERCEPT(realloc);
1716   TSAN_INTERCEPT(free);
1717   TSAN_INTERCEPT(cfree);
1718   TSAN_INTERCEPT(mmap);
1719   TSAN_INTERCEPT(mmap64);
1720   TSAN_INTERCEPT(munmap);
1721   TSAN_INTERCEPT(memalign);
1722   TSAN_INTERCEPT(valloc);
1723   TSAN_INTERCEPT(pvalloc);
1724   TSAN_INTERCEPT(posix_memalign);
1725
1726   TSAN_INTERCEPT(strlen);
1727   TSAN_INTERCEPT(memset);
1728   TSAN_INTERCEPT(memcpy);
1729   TSAN_INTERCEPT(strcmp);
1730   TSAN_INTERCEPT(memchr);
1731   TSAN_INTERCEPT(memrchr);
1732   TSAN_INTERCEPT(memmove);
1733   TSAN_INTERCEPT(memcmp);
1734   TSAN_INTERCEPT(strchr);
1735   TSAN_INTERCEPT(strchrnul);
1736   TSAN_INTERCEPT(strrchr);
1737   TSAN_INTERCEPT(strncmp);
1738   TSAN_INTERCEPT(strcpy);  // NOLINT
1739   TSAN_INTERCEPT(strncpy);
1740   TSAN_INTERCEPT(strstr);
1741
1742   TSAN_INTERCEPT(pthread_create);
1743   TSAN_INTERCEPT(pthread_join);
1744   TSAN_INTERCEPT(pthread_detach);
1745
1746   TSAN_INTERCEPT(pthread_mutex_init);
1747   TSAN_INTERCEPT(pthread_mutex_destroy);
1748   TSAN_INTERCEPT(pthread_mutex_lock);
1749   TSAN_INTERCEPT(pthread_mutex_trylock);
1750   TSAN_INTERCEPT(pthread_mutex_timedlock);
1751   TSAN_INTERCEPT(pthread_mutex_unlock);
1752
1753   TSAN_INTERCEPT(pthread_spin_init);
1754   TSAN_INTERCEPT(pthread_spin_destroy);
1755   TSAN_INTERCEPT(pthread_spin_lock);
1756   TSAN_INTERCEPT(pthread_spin_trylock);
1757   TSAN_INTERCEPT(pthread_spin_unlock);
1758
1759   TSAN_INTERCEPT(pthread_rwlock_init);
1760   TSAN_INTERCEPT(pthread_rwlock_destroy);
1761   TSAN_INTERCEPT(pthread_rwlock_rdlock);
1762   TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
1763   TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
1764   TSAN_INTERCEPT(pthread_rwlock_wrlock);
1765   TSAN_INTERCEPT(pthread_rwlock_trywrlock);
1766   TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
1767   TSAN_INTERCEPT(pthread_rwlock_unlock);
1768
1769   // TSAN_INTERCEPT(pthread_cond_init);
1770   TSAN_INTERCEPT(pthread_cond_destroy);
1771   TSAN_INTERCEPT(pthread_cond_signal);
1772   TSAN_INTERCEPT(pthread_cond_broadcast);
1773   TSAN_INTERCEPT(pthread_cond_wait);
1774   TSAN_INTERCEPT(pthread_cond_timedwait);
1775
1776   TSAN_INTERCEPT(pthread_barrier_init);
1777   TSAN_INTERCEPT(pthread_barrier_destroy);
1778   TSAN_INTERCEPT(pthread_barrier_wait);
1779
1780   TSAN_INTERCEPT(pthread_once);
1781
1782   TSAN_INTERCEPT(sem_init);
1783   TSAN_INTERCEPT(sem_destroy);
1784   TSAN_INTERCEPT(sem_wait);
1785   TSAN_INTERCEPT(sem_trywait);
1786   TSAN_INTERCEPT(sem_timedwait);
1787   TSAN_INTERCEPT(sem_post);
1788   TSAN_INTERCEPT(sem_getvalue);
1789
1790   TSAN_INTERCEPT(open);
1791   TSAN_INTERCEPT(open64);
1792   TSAN_INTERCEPT(creat);
1793   TSAN_INTERCEPT(creat64);
1794   TSAN_INTERCEPT(dup);
1795   TSAN_INTERCEPT(dup2);
1796   TSAN_INTERCEPT(dup3);
1797   TSAN_INTERCEPT(eventfd);
1798   TSAN_INTERCEPT(signalfd);
1799   TSAN_INTERCEPT(inotify_init);
1800   TSAN_INTERCEPT(inotify_init1);
1801   TSAN_INTERCEPT(socket);
1802   TSAN_INTERCEPT(socketpair);
1803   TSAN_INTERCEPT(connect);
1804   TSAN_INTERCEPT(accept);
1805   TSAN_INTERCEPT(accept4);
1806   TSAN_INTERCEPT(epoll_create);
1807   TSAN_INTERCEPT(epoll_create1);
1808   TSAN_INTERCEPT(close);
1809   TSAN_INTERCEPT(pipe);
1810   TSAN_INTERCEPT(pipe2);
1811
1812   TSAN_INTERCEPT(read);
1813   TSAN_INTERCEPT(pread);
1814   TSAN_INTERCEPT(pread64);
1815   TSAN_INTERCEPT(readv);
1816   TSAN_INTERCEPT(preadv64);
1817   TSAN_INTERCEPT(write);
1818   TSAN_INTERCEPT(pwrite);
1819   TSAN_INTERCEPT(pwrite64);
1820   TSAN_INTERCEPT(writev);
1821   TSAN_INTERCEPT(pwritev64);
1822   TSAN_INTERCEPT(send);
1823   TSAN_INTERCEPT(sendmsg);
1824   TSAN_INTERCEPT(recv);
1825   TSAN_INTERCEPT(recvmsg);
1826
1827   TSAN_INTERCEPT(unlink);
1828   TSAN_INTERCEPT(fopen);
1829   TSAN_INTERCEPT(freopen);
1830   TSAN_INTERCEPT(fclose);
1831   TSAN_INTERCEPT(fread);
1832   TSAN_INTERCEPT(fwrite);
1833   TSAN_INTERCEPT(puts);
1834   TSAN_INTERCEPT(rmdir);
1835   TSAN_INTERCEPT(opendir);
1836
1837   TSAN_INTERCEPT(epoll_ctl);
1838   TSAN_INTERCEPT(epoll_wait);
1839   TSAN_INTERCEPT(poll);
1840
1841   TSAN_INTERCEPT(sigaction);
1842   TSAN_INTERCEPT(signal);
1843   TSAN_INTERCEPT(raise);
1844   TSAN_INTERCEPT(kill);
1845   TSAN_INTERCEPT(pthread_kill);
1846   TSAN_INTERCEPT(sleep);
1847   TSAN_INTERCEPT(usleep);
1848   TSAN_INTERCEPT(nanosleep);
1849   TSAN_INTERCEPT(gettimeofday);
1850
1851   TSAN_INTERCEPT(mlock);
1852   TSAN_INTERCEPT(munlock);
1853   TSAN_INTERCEPT(mlockall);
1854   TSAN_INTERCEPT(munlockall);
1855
1856   TSAN_INTERCEPT(fork);
1857
1858   // Need to setup it, because interceptors check that the function is resolved.
1859   // But atexit is emitted directly into the module, so can't be resolved.
1860   REAL(atexit) = (int(*)(void(*)()))unreachable;
1861   atexit_ctx = new(internal_alloc(MBlockAtExit, sizeof(AtExitContext)))
1862       AtExitContext();
1863
1864   if (__cxa_atexit(&finalize, 0, 0)) {
1865     Printf("ThreadSanitizer: failed to setup atexit callback\n");
1866     Die();
1867   }
1868
1869   if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
1870     Printf("ThreadSanitizer: failed to create thread key\n");
1871     Die();
1872   }
1873
1874   FdInit();
1875 }
1876
1877 void internal_start_thread(void(*func)(void *arg), void *arg) {
1878   void *th;
1879   REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
1880   REAL(pthread_detach)(th);
1881 }
1882
1883 }  // namespace __tsan