tsan_interceptors.cc revision 68230a12bbd22c9402dd8f9af027fcb2e119f978 
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//===----------------------------------------------------------------------===//
13
14#include "sanitizer_common/sanitizer_atomic.h"
15#include "sanitizer_common/sanitizer_libc.h"
16#include "sanitizer_common/sanitizer_placement_new.h"
17#include "sanitizer_common/sanitizer_stacktrace.h"
18#include "interception/interception.h"
19#include "tsan_interface.h"
20#include "tsan_platform.h"
21#include "tsan_rtl.h"
22#include "tsan_mman.h"
23
24using namespace __tsan;  // NOLINT
25
26const int kSigCount = 128;
27
28struct my_siginfo_t {
29  int opaque[128];
30};
31
32struct sigset_t {
33  u64 val[1024 / 8 / sizeof(u64)];
34};
35
36struct ucontext_t {
37  uptr opaque[117];
38};
39
40extern "C" int pthread_attr_init(void *attr);
41extern "C" int pthread_attr_destroy(void *attr);
42extern "C" int pthread_attr_getdetachstate(void *attr, int *v);
43extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
44extern "C" int pthread_attr_getstacksize(void *attr, uptr *stacksize);
45extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
46extern "C" int pthread_setspecific(unsigned key, const void *v);
47extern "C" int pthread_mutexattr_gettype(void *a, int *type);
48extern "C" int pthread_yield();
49extern "C" int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);
50extern "C" int sigfillset(sigset_t *set);
51extern "C" void *pthread_self();
52extern "C" void _exit(int status);
53extern "C" int __cxa_atexit(void (*func)(void *arg), void *arg, void *dso);
54extern "C" int *__errno_location();
55const int PTHREAD_MUTEX_RECURSIVE = 1;
56const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
57const int kPthreadAttrSize = 56;
58const int EINVAL = 22;
59const int EBUSY = 16;
60const int EPOLL_CTL_ADD = 1;
61const int SIGILL = 4;
62const int SIGABRT = 6;
63const int SIGFPE = 8;
64const int SIGSEGV = 11;
65const int SIGPIPE = 13;
66const int SIGBUS = 7;
67void *const MAP_FAILED = (void*)-1;
68const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
69const int MAP_FIXED = 0x10;
70typedef long long_t;  // NOLINT
71
72// From /usr/include/unistd.h
73# define F_ULOCK 0      /* Unlock a previously locked region.  */
74# define F_LOCK  1      /* Lock a region for exclusive use.  */
75# define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
76# define F_TEST  3      /* Test a region for other processes locks.  */
77
78typedef void (*sighandler_t)(int sig);
79
80#define errno (*__errno_location())
81
82union pthread_attr_t {
83  char size[kPthreadAttrSize];
84  void *align;
85};
86
87struct sigaction_t {
88  union {
89    sighandler_t sa_handler;
90    void (*sa_sigaction)(int sig, my_siginfo_t *siginfo, void *uctx);
91  };
92  sigset_t sa_mask;
93  int sa_flags;
94  void (*sa_restorer)();
95};
96
97const sighandler_t SIG_DFL = (sighandler_t)0;
98const sighandler_t SIG_IGN = (sighandler_t)1;
99const sighandler_t SIG_ERR = (sighandler_t)-1;
100const int SA_SIGINFO = 4;
101const int SIG_SETMASK = 2;
102
103namespace std {
104struct nothrow_t {};
105}  // namespace std
106
107static sigaction_t sigactions[kSigCount];
108
109namespace __tsan {
110struct SignalDesc {
111  bool armed;
112  bool sigaction;
113  my_siginfo_t siginfo;
114  ucontext_t ctx;
115};
116
117struct SignalContext {
118  int in_blocking_func;
119  int int_signal_send;
120  int pending_signal_count;
121  SignalDesc pending_signals[kSigCount];
122};
123}
124
125static SignalContext *SigCtx(ThreadState *thr) {
126  SignalContext *ctx = (SignalContext*)thr->signal_ctx;
127  if (ctx == 0 && thr->is_alive) {
128    ScopedInRtl in_rtl;
129    ctx = (SignalContext*)internal_alloc(
130        MBlockSignal, sizeof(*ctx));
131    MemoryResetRange(thr, 0, (uptr)ctx, sizeof(*ctx));
132    internal_memset(ctx, 0, sizeof(*ctx));
133    thr->signal_ctx = ctx;
134  }
135  return ctx;
136}
137
138static unsigned g_thread_finalize_key;
139
140class ScopedInterceptor {
141 public:
142  ScopedInterceptor(ThreadState *thr, const char *fname, uptr pc);
143  ~ScopedInterceptor();
144 private:
145  ThreadState *const thr_;
146  const int in_rtl_;
147};
148
149ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
150                                     uptr pc)
151    : thr_(thr)
152    , in_rtl_(thr->in_rtl) {
153  if (thr_->in_rtl == 0) {
154    Initialize(thr);
155    FuncEntry(thr, pc);
156    thr_->in_rtl++;
157    DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
158  } else {
159    thr_->in_rtl++;
160  }
161}
162
163ScopedInterceptor::~ScopedInterceptor() {
164  thr_->in_rtl--;
165  if (thr_->in_rtl == 0) {
166    FuncExit(thr_);
167    ProcessPendingSignals(thr_);
168  }
169  CHECK_EQ(in_rtl_, thr_->in_rtl);
170}
171
172#define SCOPED_INTERCEPTOR_RAW(func, ...) \
173    ThreadState *thr = cur_thread(); \
174    StatInc(thr, StatInterceptor); \
175    StatInc(thr, StatInt_##func); \
176    const uptr caller_pc = GET_CALLER_PC(); \
177    ScopedInterceptor si(thr, #func, caller_pc); \
178    /* Subtract one from pc as we need current instruction address */ \
179    const uptr pc = __sanitizer::StackTrace::GetCurrentPc() - 1; \
180    (void)pc; \
181/**/
182
183#define SCOPED_TSAN_INTERCEPTOR(func, ...) \
184    SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
185    if (REAL(func) == 0) { \
186      Printf("FATAL: ThreadSanitizer: failed to intercept %s\n", #func); \
187      Die(); \
188    } \
189    if (thr->in_rtl > 1) \
190      return REAL(func)(__VA_ARGS__); \
191/**/
192
193#define TSAN_INTERCEPTOR(ret, func, ...) INTERCEPTOR(ret, func, __VA_ARGS__)
194#define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
195
196#define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
197
198struct BlockingCall {
199  explicit BlockingCall(ThreadState *thr)
200      : ctx(SigCtx(thr)) {
201    ctx->in_blocking_func++;
202  }
203
204  ~BlockingCall() {
205    ctx->in_blocking_func--;
206  }
207
208  SignalContext *ctx;
209};
210
211TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
212  SCOPED_TSAN_INTERCEPTOR(sleep, sec);
213  unsigned res = BLOCK_REAL(sleep)(sec);
214  AfterSleep(thr, pc);
215  return res;
216}
217
218TSAN_INTERCEPTOR(int, usleep, long_t usec) {
219  SCOPED_TSAN_INTERCEPTOR(usleep, usec);
220  int res = BLOCK_REAL(usleep)(usec);
221  AfterSleep(thr, pc);
222  return res;
223}
224
225TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
226  SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
227  int res = BLOCK_REAL(nanosleep)(req, rem);
228  AfterSleep(thr, pc);
229  return res;
230}
231
232class AtExitContext {
233 public:
234  AtExitContext()
235    : mtx_(MutexTypeAtExit, StatMtxAtExit)
236    , pos_() {
237  }
238
239  typedef void(*atexit_t)();
240
241  int atexit(ThreadState *thr, uptr pc, atexit_t f) {
242    Lock l(&mtx_);
243    if (pos_ == kMaxAtExit)
244      return 1;
245    Release(thr, pc, (uptr)this);
246    stack_[pos_] = f;
247    pos_++;
248    return 0;
249  }
250
251  void exit(ThreadState *thr, uptr pc) {
252    CHECK_EQ(thr->in_rtl, 0);
253    for (;;) {
254      atexit_t f = 0;
255      {
256        Lock l(&mtx_);
257        if (pos_) {
258          pos_--;
259          f = stack_[pos_];
260          ScopedInRtl in_rtl;
261          Acquire(thr, pc, (uptr)this);
262        }
263      }
264      if (f == 0)
265        break;
266      DPrintf("#%d: executing atexit func %p\n", thr->tid, f);
267      CHECK_EQ(thr->in_rtl, 0);
268      f();
269    }
270  }
271
272 private:
273  static const int kMaxAtExit = 128;
274  Mutex mtx_;
275  atexit_t stack_[kMaxAtExit];
276  int pos_;
277};
278
279static AtExitContext *atexit_ctx;
280
281static void finalize(void *arg) {
282  ThreadState * thr = cur_thread();
283  uptr pc = 0;
284  atexit_ctx->exit(thr, pc);
285  {
286    ScopedInRtl in_rtl;
287    DestroyAndFree(atexit_ctx);
288  }
289  int status = Finalize(cur_thread());
290  if (status)
291    _exit(status);
292}
293
294TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
295  SCOPED_TSAN_INTERCEPTOR(atexit, f);
296  return atexit_ctx->atexit(thr, pc, f);
297}
298
299TSAN_INTERCEPTOR(void, longjmp, void *env, int val) {
300  SCOPED_TSAN_INTERCEPTOR(longjmp, env, val);
301  Printf("ThreadSanitizer: longjmp() is not supported\n");
302  Die();
303}
304
305TSAN_INTERCEPTOR(void, siglongjmp, void *env, int val) {
306  SCOPED_TSAN_INTERCEPTOR(siglongjmp, env, val);
307  Printf("ThreadSanitizer: siglongjmp() is not supported\n");
308  Die();
309}
310
311enum FdType {
312  FdGlobal,  // Something we don't know about, global sync.
313  FdNone,  // Does not require any sync.
314  FdFile,
315  FdSock,
316  FdPipe,
317  FdEvent,  // see eventfd()
318  FdPoll,
319};
320
321struct FdDesc {
322  FdType type;
323  u64 sync;
324};
325
326struct FdContext {
327  static const int kMaxFds = 10 * 1024;  // Everything else is synced globally.
328  FdDesc desc[kMaxFds];
329  // Addresses used for synchronization.
330  u64 fdglobal;
331  u64 fdfile;
332  u64 fdsock;
333  u64 fdpipe;
334  u64 fdpoll;
335  u64 fdevent;
336};
337
338static FdContext fdctx;
339
340static void FdInit() {
341  fdctx.desc[0].type = FdNone;
342  fdctx.desc[1].type = FdNone;
343  fdctx.desc[2].type = FdNone;
344}
345
346static void *FdAddr(int fd) {
347  if (fd >= FdContext::kMaxFds)
348    return &fdctx.fdglobal;
349  FdDesc *desc = &fdctx.desc[fd];
350  if (desc->type == FdNone)
351    return 0;
352  if (desc->type == FdGlobal)
353    return &fdctx.fdglobal;
354  if (desc->type == FdFile)
355    return &fdctx.fdfile;
356  if (desc->type == FdSock)
357    return &fdctx.fdsock;
358  if (desc->type == FdPipe)
359    return &fdctx.fdpipe;
360  if (desc->type == FdEvent)
361    return &fdctx.fdevent;
362  if (desc->type == FdPoll)
363    return &fdctx.fdpoll;
364  CHECK(0);
365  return 0;
366}
367
368static void FdAcquire(ThreadState *thr, uptr pc, int fd) {
369  void *addr = FdAddr(fd);
370  DPrintf("#%d: FdAcquire(%d) -> %p\n", thr->tid, fd, addr);
371  if (addr)
372    Acquire(thr, pc, (uptr)addr);
373  if (fd < FdContext::kMaxFds)
374    MemoryRead8Byte(thr, pc, (uptr)&fdctx.desc[fd].sync);
375}
376
377static void FdRelease(ThreadState *thr, uptr pc, int fd) {
378  void *addr = FdAddr(fd);
379  DPrintf("#%d: FdRelease(%d) -> %p\n", thr->tid, fd, addr);
380  if (addr)
381    Release(thr, pc, (uptr)addr);
382  if (fd < FdContext::kMaxFds)
383    MemoryRead8Byte(thr, pc, (uptr)&fdctx.desc[fd].sync);
384}
385
386static void FdClose(ThreadState *thr, uptr pc, int fd) {
387  if (fd >= FdContext::kMaxFds)
388    return;
389  FdDesc *desc = &fdctx.desc[fd];
390  SyncVar *s = CTX()->synctab.GetAndRemove(thr, pc, (uptr)&desc->sync);
391  if (s)
392    DestroyAndFree(s);
393  // FIXME(dvyukov): change to FdNone once we handle all fd operations.
394  desc->type = FdGlobal;
395  // To catch races between fd usage and close.
396  MemoryWrite8Byte(thr, pc, (uptr)&desc->sync);
397  // We need to clear it, because if we do not intercept any call out there
398  // that creates fd, we will hit false postives.
399  MemoryResetRange(thr, pc, (uptr)&desc->sync, sizeof(desc->sync));
400}
401
402static void FdFileCreate(ThreadState *thr, uptr pc, int fd) {
403  if (fd >= FdContext::kMaxFds)
404    return;
405  FdDesc *desc = &fdctx.desc[fd];
406  desc->type = FdFile;
407  // To catch races between fd usage and open.
408  MemoryRangeImitateWrite(thr, pc, (uptr)&desc->sync, sizeof(desc->sync));
409}
410
411static void FdDup(ThreadState *thr, uptr pc, int oldfd, int newfd) {
412  if (oldfd >= FdContext::kMaxFds || newfd >= FdContext::kMaxFds) {
413    if (oldfd < FdContext::kMaxFds) {
414      // FIXME(dvyukov): here we lose old sync object associated with the fd,
415      // this can lead to false positives.
416      FdDesc *odesc = &fdctx.desc[oldfd];
417      odesc->type = FdGlobal;
418    }
419    if (newfd < FdContext::kMaxFds) {
420      FdClose(thr, pc, newfd);
421      FdDesc *ndesc = &fdctx.desc[newfd];
422      ndesc->type = FdGlobal;
423    }
424    return;
425  }
426
427  FdClose(thr, pc, newfd);
428  FdDesc *ndesc = &fdctx.desc[newfd];
429  ndesc->type = FdFile;
430  // To catch races between fd usage and open.
431  MemoryRangeImitateWrite(thr, pc, (uptr)&ndesc->sync, sizeof(ndesc->sync));
432}
433
434static void FdPipeCreate(ThreadState *thr, uptr pc, int rfd, int wfd) {
435  if (rfd >= FdContext::kMaxFds || wfd >= FdContext::kMaxFds) {
436    if (rfd < FdContext::kMaxFds) {
437      FdDesc *rdesc = &fdctx.desc[rfd];
438      rdesc->type = FdGlobal;
439    }
440    if (wfd < FdContext::kMaxFds) {
441      FdDesc *wdesc = &fdctx.desc[wfd];
442      wdesc->type = FdGlobal;
443    }
444    return;
445  }
446
447  FdDesc *rdesc = &fdctx.desc[rfd];
448  rdesc->type = FdPipe;
449  // To catch races between fd usage and open.
450  MemoryRangeImitateWrite(thr, pc, (uptr)&rdesc->sync, sizeof(rdesc->sync));
451
452  FdDesc *wdesc = &fdctx.desc[wfd];
453  wdesc->type = FdPipe;
454  // To catch races between fd usage and open.
455  MemoryRangeImitateWrite(thr, pc, (uptr)&wdesc->sync, sizeof(rdesc->sync));
456
457  DPrintf("#%d: FdCreatePipe(%d, %d)\n", thr->tid, rfd, wfd);
458}
459
460static void FdEventCreate(ThreadState *thr, uptr pc, int fd) {
461  if (fd >= FdContext::kMaxFds)
462    return;
463  FdDesc *desc = &fdctx.desc[fd];
464  desc->type = FdEvent;
465  // To catch races between fd usage and open.
466  MemoryRangeImitateWrite(thr, pc, (uptr)&desc->sync, sizeof(desc->sync));
467}
468
469static void FdPollCreate(ThreadState *thr, uptr pc, int fd) {
470  if (fd >= FdContext::kMaxFds)
471    return;
472  FdDesc *desc = &fdctx.desc[fd];
473  desc->type = FdPoll;
474  // To catch races between fd usage and open.
475  MemoryRangeImitateWrite(thr, pc, (uptr)&desc->sync, sizeof(desc->sync));
476}
477
478static void FdSocketCreate(ThreadState *thr, uptr pc, int fd) {
479  if (fd >= FdContext::kMaxFds)
480    return;
481  FdDesc *desc = &fdctx.desc[fd];
482  // It can be UDP socket, let's assume they are not used for synchronization.
483  desc->type = FdNone;
484  // To catch races between fd usage and open.
485  MemoryRangeImitateWrite(thr, pc, (uptr)&desc->sync, sizeof(desc->sync));
486}
487
488static void FdSocketAccept(ThreadState *thr, uptr pc, int fd, int newfd) {
489  if (fd < FdContext::kMaxFds) {
490    FdDesc *desc = &fdctx.desc[fd];
491    desc->type = FdNone;
492    MemoryRead8Byte(thr, pc, (uptr)&desc->sync);
493  }
494  if (newfd < FdContext::kMaxFds) {
495    FdDesc *desc = &fdctx.desc[newfd];
496    desc->type = FdSock;
497    MemoryWrite8Byte(thr, pc, (uptr)&desc->sync);
498  }
499}
500
501static void FdSocketConnect(ThreadState *thr, uptr pc, int fd) {
502  if (fd >= FdContext::kMaxFds)
503    return;
504  FdDesc *desc = &fdctx.desc[fd];
505  desc->type = FdSock;
506  MemoryWrite8Byte(thr, pc, (uptr)&desc->sync);
507}
508
509static uptr file2addr(char *path) {
510  (void)path;
511  static u64 addr;
512  return (uptr)&addr;
513}
514
515static uptr dir2addr(char *path) {
516  (void)path;
517  static u64 addr;
518  return (uptr)&addr;
519}
520
521TSAN_INTERCEPTOR(void*, malloc, uptr size) {
522  void *p = 0;
523  {
524    SCOPED_INTERCEPTOR_RAW(malloc, size);
525    p = user_alloc(thr, pc, size);
526  }
527  invoke_malloc_hook(p, size);
528  return p;
529}
530
531TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
532  SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
533  return user_alloc(thr, pc, sz, align);
534}
535
536TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
537  void *p = 0;
538  {
539    SCOPED_INTERCEPTOR_RAW(calloc, size, n);
540    p = user_alloc(thr, pc, n * size);
541    if (p) internal_memset(p, 0, n * size);
542  }
543  invoke_malloc_hook(p, n * size);
544  return p;
545}
546
547TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
548  if (p)
549    invoke_free_hook(p);
550  {
551    SCOPED_INTERCEPTOR_RAW(realloc, p, size);
552    p = user_realloc(thr, pc, p, size);
553  }
554  invoke_malloc_hook(p, size);
555  return p;
556}
557
558TSAN_INTERCEPTOR(void, free, void *p) {
559  if (p == 0)
560    return;
561  invoke_free_hook(p);
562  SCOPED_INTERCEPTOR_RAW(free, p);
563  user_free(thr, pc, p);
564}
565
566TSAN_INTERCEPTOR(void, cfree, void *p) {
567  if (p == 0)
568    return;
569  invoke_free_hook(p);
570  SCOPED_INTERCEPTOR_RAW(cfree, p);
571  user_free(thr, pc, p);
572}
573
574#define OPERATOR_NEW_BODY(mangled_name) \
575  void *p = 0; \
576  {  \
577    SCOPED_INTERCEPTOR_RAW(mangled_name, size); \
578    p = user_alloc(thr, pc, size); \
579  }  \
580  invoke_malloc_hook(p, size);  \
581  return p;
582
583void *operator new(__sanitizer::uptr size) {
584  OPERATOR_NEW_BODY(_Znwm);
585}
586void *operator new[](__sanitizer::uptr size) {
587  OPERATOR_NEW_BODY(_Znam);
588}
589void *operator new(__sanitizer::uptr size, std::nothrow_t const&) {
590  OPERATOR_NEW_BODY(_ZnwmRKSt9nothrow_t);
591}
592void *operator new[](__sanitizer::uptr size, std::nothrow_t const&) {
593  OPERATOR_NEW_BODY(_ZnamRKSt9nothrow_t);
594}
595
596#define OPERATOR_DELETE_BODY(mangled_name) \
597  if (ptr == 0) return;  \
598  invoke_free_hook(ptr);  \
599  SCOPED_INTERCEPTOR_RAW(mangled_name, ptr);  \
600  user_free(thr, pc, ptr);
601
602void operator delete(void *ptr) {
603  OPERATOR_DELETE_BODY(_ZdlPv);
604}
605void operator delete[](void *ptr) {
606  OPERATOR_DELETE_BODY(_ZdlPvRKSt9nothrow_t);
607}
608void operator delete(void *ptr, std::nothrow_t const&) {
609  OPERATOR_DELETE_BODY(_ZdaPv);
610}
611void operator delete[](void *ptr, std::nothrow_t const&) {
612  OPERATOR_DELETE_BODY(_ZdaPvRKSt9nothrow_t);
613}
614
615TSAN_INTERCEPTOR(uptr, strlen, const char *s) {
616  SCOPED_TSAN_INTERCEPTOR(strlen, s);
617  uptr len = internal_strlen(s);
618  MemoryAccessRange(thr, pc, (uptr)s, len + 1, false);
619  return len;
620}
621
622TSAN_INTERCEPTOR(void*, memset, void *dst, int v, uptr size) {
623  SCOPED_TSAN_INTERCEPTOR(memset, dst, v, size);
624  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
625  return internal_memset(dst, v, size);
626}
627
628TSAN_INTERCEPTOR(void*, memcpy, void *dst, const void *src, uptr size) {
629  SCOPED_TSAN_INTERCEPTOR(memcpy, dst, src, size);
630  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
631  MemoryAccessRange(thr, pc, (uptr)src, size, false);
632  return internal_memcpy(dst, src, size);
633}
634
635TSAN_INTERCEPTOR(int, memcmp, const void *s1, const void *s2, uptr n) {
636  SCOPED_TSAN_INTERCEPTOR(memcmp, s1, s2, n);
637  int res = 0;
638  uptr len = 0;
639  for (; len < n; len++) {
640    if ((res = ((unsigned char*)s1)[len] - ((unsigned char*)s2)[len]))
641      break;
642  }
643  MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
644  MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
645  return res;
646}
647
648TSAN_INTERCEPTOR(int, strcmp, const char *s1, const char *s2) {
649  SCOPED_TSAN_INTERCEPTOR(strcmp, s1, s2);
650  uptr len = 0;
651  for (; s1[len] && s2[len]; len++) {
652    if (s1[len] != s2[len])
653      break;
654  }
655  MemoryAccessRange(thr, pc, (uptr)s1, len + 1, false);
656  MemoryAccessRange(thr, pc, (uptr)s2, len + 1, false);
657  return s1[len] - s2[len];
658}
659
660TSAN_INTERCEPTOR(int, strncmp, const char *s1, const char *s2, uptr n) {
661  SCOPED_TSAN_INTERCEPTOR(strncmp, s1, s2, n);
662  uptr len = 0;
663  for (; len < n && s1[len] && s2[len]; len++) {
664    if (s1[len] != s2[len])
665      break;
666  }
667  MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
668  MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
669  return len == n ? 0 : s1[len] - s2[len];
670}
671
672TSAN_INTERCEPTOR(void*, memchr, void *s, int c, uptr n) {
673  SCOPED_TSAN_INTERCEPTOR(memchr, s, c, n);
674  void *res = REAL(memchr)(s, c, n);
675  uptr len = res ? (char*)res - (char*)s + 1 : n;
676  MemoryAccessRange(thr, pc, (uptr)s, len, false);
677  return res;
678}
679
680TSAN_INTERCEPTOR(void*, memrchr, char *s, int c, uptr n) {
681  SCOPED_TSAN_INTERCEPTOR(memrchr, s, c, n);
682  MemoryAccessRange(thr, pc, (uptr)s, n, false);
683  return REAL(memrchr)(s, c, n);
684}
685
686TSAN_INTERCEPTOR(void*, memmove, void *dst, void *src, uptr n) {
687  SCOPED_TSAN_INTERCEPTOR(memmove, dst, src, n);
688  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
689  MemoryAccessRange(thr, pc, (uptr)src, n, false);
690  return REAL(memmove)(dst, src, n);
691}
692
693TSAN_INTERCEPTOR(char*, strchr, char *s, int c) {
694  SCOPED_TSAN_INTERCEPTOR(strchr, s, c);
695  char *res = REAL(strchr)(s, c);
696  uptr len = res ? (char*)res - (char*)s + 1 : internal_strlen(s) + 1;
697  MemoryAccessRange(thr, pc, (uptr)s, len, false);
698  return res;
699}
700
701TSAN_INTERCEPTOR(char*, strchrnul, char *s, int c) {
702  SCOPED_TSAN_INTERCEPTOR(strchrnul, s, c);
703  char *res = REAL(strchrnul)(s, c);
704  uptr len = (char*)res - (char*)s + 1;
705  MemoryAccessRange(thr, pc, (uptr)s, len, false);
706  return res;
707}
708
709TSAN_INTERCEPTOR(char*, strrchr, char *s, int c) {
710  SCOPED_TSAN_INTERCEPTOR(strrchr, s, c);
711  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s) + 1, false);
712  return REAL(strrchr)(s, c);
713}
714
715TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) {  // NOLINT
716  SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);  // NOLINT
717  uptr srclen = internal_strlen(src);
718  MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
719  MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
720  return REAL(strcpy)(dst, src);  // NOLINT
721}
722
723TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
724  SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
725  uptr srclen = internal_strnlen(src, n);
726  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
727  MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
728  return REAL(strncpy)(dst, src, n);
729}
730
731TSAN_INTERCEPTOR(const char*, strstr, const char *s1, const char *s2) {
732  SCOPED_TSAN_INTERCEPTOR(strstr, s1, s2);
733  const char *res = REAL(strstr)(s1, s2);
734  uptr len1 = internal_strlen(s1);
735  uptr len2 = internal_strlen(s2);
736  MemoryAccessRange(thr, pc, (uptr)s1, len1 + 1, false);
737  MemoryAccessRange(thr, pc, (uptr)s2, len2 + 1, false);
738  return res;
739}
740
741static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
742  if (*addr) {
743    if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
744      if (flags & MAP_FIXED) {
745        errno = EINVAL;
746        return false;
747      } else {
748        *addr = 0;
749      }
750    }
751  }
752  return true;
753}
754
755TSAN_INTERCEPTOR(void*, mmap, void *addr, long_t sz, int prot,
756                         int flags, int fd, unsigned off) {
757  SCOPED_TSAN_INTERCEPTOR(mmap, addr, sz, prot, flags, fd, off);
758  if (!fix_mmap_addr(&addr, sz, flags))
759    return MAP_FAILED;
760  void *res = REAL(mmap)(addr, sz, prot, flags, fd, off);
761  if (res != MAP_FAILED) {
762    MemoryResetRange(thr, pc, (uptr)res, sz);
763  }
764  return res;
765}
766
767TSAN_INTERCEPTOR(void*, mmap64, void *addr, long_t sz, int prot,
768                           int flags, int fd, u64 off) {
769  SCOPED_TSAN_INTERCEPTOR(mmap64, addr, sz, prot, flags, fd, off);
770  if (!fix_mmap_addr(&addr, sz, flags))
771    return MAP_FAILED;
772  void *res = REAL(mmap64)(addr, sz, prot, flags, fd, off);
773  if (res != MAP_FAILED) {
774    MemoryResetRange(thr, pc, (uptr)res, sz);
775  }
776  return res;
777}
778
779TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
780  SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
781  int res = REAL(munmap)(addr, sz);
782  return res;
783}
784
785TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
786  SCOPED_TSAN_INTERCEPTOR(memalign, align, sz);
787  return user_alloc(thr, pc, sz, align);
788}
789
790TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
791  SCOPED_TSAN_INTERCEPTOR(valloc, sz);
792  return user_alloc(thr, pc, sz, GetPageSizeCached());
793}
794
795TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
796  SCOPED_TSAN_INTERCEPTOR(pvalloc, sz);
797  sz = RoundUp(sz, GetPageSizeCached());
798  return user_alloc(thr, pc, sz, GetPageSizeCached());
799}
800
801TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
802  SCOPED_TSAN_INTERCEPTOR(posix_memalign, memptr, align, sz);
803  *memptr = user_alloc(thr, pc, sz, align);
804  return 0;
805}
806
807// Used in thread-safe function static initialization.
808extern "C" int INTERFACE_ATTRIBUTE __cxa_guard_acquire(atomic_uint32_t *g) {
809  SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
810  for (;;) {
811    u32 cmp = atomic_load(g, memory_order_acquire);
812    if (cmp == 0) {
813      if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
814        return 1;
815    } else if (cmp == 1) {
816      Acquire(thr, pc, (uptr)g);
817      return 0;
818    } else {
819      internal_sched_yield();
820    }
821  }
822}
823
824extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_release(atomic_uint32_t *g) {
825  SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
826  Release(thr, pc, (uptr)g);
827  atomic_store(g, 1, memory_order_release);
828}
829
830extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_abort(atomic_uint32_t *g) {
831  SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
832  atomic_store(g, 0, memory_order_relaxed);
833}
834
835static void thread_finalize(void *v) {
836  uptr iter = (uptr)v;
837  if (iter > 1) {
838    if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
839      Printf("ThreadSanitizer: failed to set thread key\n");
840      Die();
841    }
842    return;
843  }
844  {
845    ScopedInRtl in_rtl;
846    ThreadState *thr = cur_thread();
847    ThreadFinish(thr);
848    SignalContext *sctx = thr->signal_ctx;
849    if (sctx) {
850      thr->signal_ctx = 0;
851      internal_free(sctx);
852    }
853  }
854}
855
856
857struct ThreadParam {
858  void* (*callback)(void *arg);
859  void *param;
860  atomic_uintptr_t tid;
861};
862
863extern "C" void *__tsan_thread_start_func(void *arg) {
864  ThreadParam *p = (ThreadParam*)arg;
865  void* (*callback)(void *arg) = p->callback;
866  void *param = p->param;
867  int tid = 0;
868  {
869    ThreadState *thr = cur_thread();
870    ScopedInRtl in_rtl;
871    if (pthread_setspecific(g_thread_finalize_key, (void*)4)) {
872      Printf("ThreadSanitizer: failed to set thread key\n");
873      Die();
874    }
875    while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
876      pthread_yield();
877    atomic_store(&p->tid, 0, memory_order_release);
878    ThreadStart(thr, tid, GetTid());
879    CHECK_EQ(thr->in_rtl, 1);
880  }
881  void *res = callback(param);
882  // Prevent the callback from being tail called,
883  // it mixes up stack traces.
884  volatile int foo = 42;
885  foo++;
886  return res;
887}
888
889TSAN_INTERCEPTOR(int, pthread_create,
890    void *th, void *attr, void *(*callback)(void*), void * param) {
891  SCOPED_TSAN_INTERCEPTOR(pthread_create, th, attr, callback, param);
892  pthread_attr_t myattr;
893  if (attr == 0) {
894    pthread_attr_init(&myattr);
895    attr = &myattr;
896  }
897  int detached = 0;
898  pthread_attr_getdetachstate(attr, &detached);
899  uptr stacksize = 0;
900  pthread_attr_getstacksize(attr, &stacksize);
901  // We place the huge ThreadState object into TLS, account for that.
902  const uptr minstacksize = GetTlsSize() + 128*1024;
903  if (stacksize < minstacksize) {
904    DPrintf("ThreadSanitizer: stacksize %zu->%zu\n", stacksize, minstacksize);
905    pthread_attr_setstacksize(attr, minstacksize);
906  }
907  ThreadParam p;
908  p.callback = callback;
909  p.param = param;
910  atomic_store(&p.tid, 0, memory_order_relaxed);
911  int res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
912  if (res == 0) {
913    int tid = ThreadCreate(thr, pc, *(uptr*)th, detached);
914    CHECK_NE(tid, 0);
915    atomic_store(&p.tid, tid, memory_order_release);
916    while (atomic_load(&p.tid, memory_order_acquire) != 0)
917      pthread_yield();
918  }
919  if (attr == &myattr)
920    pthread_attr_destroy(&myattr);
921  return res;
922}
923
924TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
925  SCOPED_TSAN_INTERCEPTOR(pthread_join, th, ret);
926  int tid = ThreadTid(thr, pc, (uptr)th);
927  int res = BLOCK_REAL(pthread_join)(th, ret);
928  if (res == 0) {
929    ThreadJoin(thr, pc, tid);
930  }
931  return res;
932}
933
934TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
935  SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
936  int tid = ThreadTid(thr, pc, (uptr)th);
937  int res = REAL(pthread_detach)(th);
938  if (res == 0) {
939    ThreadDetach(thr, pc, tid);
940  }
941  return res;
942}
943
944TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
945  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
946  int res = REAL(pthread_mutex_init)(m, a);
947  if (res == 0) {
948    bool recursive = false;
949    if (a) {
950      int type = 0;
951      if (pthread_mutexattr_gettype(a, &type) == 0)
952        recursive = (type == PTHREAD_MUTEX_RECURSIVE
953            || type == PTHREAD_MUTEX_RECURSIVE_NP);
954    }
955    MutexCreate(thr, pc, (uptr)m, false, recursive, false);
956  }
957  return res;
958}
959
960TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
961  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
962  int res = REAL(pthread_mutex_destroy)(m);
963  if (res == 0 || res == EBUSY) {
964    MutexDestroy(thr, pc, (uptr)m);
965  }
966  return res;
967}
968
969TSAN_INTERCEPTOR(int, pthread_mutex_lock, void *m) {
970  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_lock, m);
971  int res = REAL(pthread_mutex_lock)(m);
972  if (res == 0) {
973    MutexLock(thr, pc, (uptr)m);
974  }
975  return res;
976}
977
978TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
979  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
980  int res = REAL(pthread_mutex_trylock)(m);
981  if (res == 0) {
982    MutexLock(thr, pc, (uptr)m);
983  }
984  return res;
985}
986
987TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
988  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
989  int res = REAL(pthread_mutex_timedlock)(m, abstime);
990  if (res == 0) {
991    MutexLock(thr, pc, (uptr)m);
992  }
993  return res;
994}
995
996TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {
997  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_unlock, m);
998  MutexUnlock(thr, pc, (uptr)m);
999  int res = REAL(pthread_mutex_unlock)(m);
1000  return res;
1001}
1002
1003TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
1004  SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
1005  int res = REAL(pthread_spin_init)(m, pshared);
1006  if (res == 0) {
1007    MutexCreate(thr, pc, (uptr)m, false, false, false);
1008  }
1009  return res;
1010}
1011
1012TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
1013  SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
1014  int res = REAL(pthread_spin_destroy)(m);
1015  if (res == 0) {
1016    MutexDestroy(thr, pc, (uptr)m);
1017  }
1018  return res;
1019}
1020
1021TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
1022  SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
1023  int res = REAL(pthread_spin_lock)(m);
1024  if (res == 0) {
1025    MutexLock(thr, pc, (uptr)m);
1026  }
1027  return res;
1028}
1029
1030TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
1031  SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
1032  int res = REAL(pthread_spin_trylock)(m);
1033  if (res == 0) {
1034    MutexLock(thr, pc, (uptr)m);
1035  }
1036  return res;
1037}
1038
1039TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
1040  SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
1041  MutexUnlock(thr, pc, (uptr)m);
1042  int res = REAL(pthread_spin_unlock)(m);
1043  return res;
1044}
1045
1046TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
1047  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
1048  int res = REAL(pthread_rwlock_init)(m, a);
1049  if (res == 0) {
1050    MutexCreate(thr, pc, (uptr)m, true, false, false);
1051  }
1052  return res;
1053}
1054
1055TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
1056  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
1057  int res = REAL(pthread_rwlock_destroy)(m);
1058  if (res == 0) {
1059    MutexDestroy(thr, pc, (uptr)m);
1060  }
1061  return res;
1062}
1063
1064TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
1065  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
1066  int res = REAL(pthread_rwlock_rdlock)(m);
1067  if (res == 0) {
1068    MutexReadLock(thr, pc, (uptr)m);
1069  }
1070  return res;
1071}
1072
1073TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
1074  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
1075  int res = REAL(pthread_rwlock_tryrdlock)(m);
1076  if (res == 0) {
1077    MutexReadLock(thr, pc, (uptr)m);
1078  }
1079  return res;
1080}
1081
1082TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
1083  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
1084  int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
1085  if (res == 0) {
1086    MutexReadLock(thr, pc, (uptr)m);
1087  }
1088  return res;
1089}
1090
1091TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
1092  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
1093  int res = REAL(pthread_rwlock_wrlock)(m);
1094  if (res == 0) {
1095    MutexLock(thr, pc, (uptr)m);
1096  }
1097  return res;
1098}
1099
1100TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
1101  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
1102  int res = REAL(pthread_rwlock_trywrlock)(m);
1103  if (res == 0) {
1104    MutexLock(thr, pc, (uptr)m);
1105  }
1106  return res;
1107}
1108
1109TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
1110  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
1111  int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
1112  if (res == 0) {
1113    MutexLock(thr, pc, (uptr)m);
1114  }
1115  return res;
1116}
1117
1118TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
1119  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
1120  MutexReadOrWriteUnlock(thr, pc, (uptr)m);
1121  int res = REAL(pthread_rwlock_unlock)(m);
1122  return res;
1123}
1124
1125TSAN_INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
1126  SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, c, a);
1127  int res = REAL(pthread_cond_init)(c, a);
1128  return res;
1129}
1130
1131TSAN_INTERCEPTOR(int, pthread_cond_destroy, void *c) {
1132  SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, c);
1133  int res = REAL(pthread_cond_destroy)(c);
1134  return res;
1135}
1136
1137TSAN_INTERCEPTOR(int, pthread_cond_signal, void *c) {
1138  SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, c);
1139  int res = REAL(pthread_cond_signal)(c);
1140  return res;
1141}
1142
1143TSAN_INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
1144  SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, c);
1145  int res = REAL(pthread_cond_broadcast)(c);
1146  return res;
1147}
1148
1149TSAN_INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
1150  SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, c, m);
1151  MutexUnlock(thr, pc, (uptr)m);
1152  int res = REAL(pthread_cond_wait)(c, m);
1153  MutexLock(thr, pc, (uptr)m);
1154  return res;
1155}
1156
1157TSAN_INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m, void *abstime) {
1158  SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, c, m, abstime);
1159  MutexUnlock(thr, pc, (uptr)m);
1160  int res = REAL(pthread_cond_timedwait)(c, m, abstime);
1161  MutexLock(thr, pc, (uptr)m);
1162  return res;
1163}
1164
1165TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1166  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1167  MemoryWrite1Byte(thr, pc, (uptr)b);
1168  int res = REAL(pthread_barrier_init)(b, a, count);
1169  return res;
1170}
1171
1172TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1173  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1174  MemoryWrite1Byte(thr, pc, (uptr)b);
1175  int res = REAL(pthread_barrier_destroy)(b);
1176  return res;
1177}
1178
1179TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1180  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1181  Release(thr, pc, (uptr)b);
1182  MemoryRead1Byte(thr, pc, (uptr)b);
1183  int res = REAL(pthread_barrier_wait)(b);
1184  MemoryRead1Byte(thr, pc, (uptr)b);
1185  if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1186    Acquire(thr, pc, (uptr)b);
1187  }
1188  return res;
1189}
1190
1191TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1192  SCOPED_TSAN_INTERCEPTOR(pthread_once, o, f);
1193  if (o == 0 || f == 0)
1194    return EINVAL;
1195  atomic_uint32_t *a = static_cast<atomic_uint32_t*>(o);
1196  u32 v = atomic_load(a, memory_order_acquire);
1197  if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1198                                               memory_order_relaxed)) {
1199    const int old_in_rtl = thr->in_rtl;
1200    thr->in_rtl = 0;
1201    (*f)();
1202    CHECK_EQ(thr->in_rtl, 0);
1203    thr->in_rtl = old_in_rtl;
1204    Release(thr, pc, (uptr)o);
1205    atomic_store(a, 2, memory_order_release);
1206  } else {
1207    while (v != 2) {
1208      pthread_yield();
1209      v = atomic_load(a, memory_order_acquire);
1210    }
1211    Acquire(thr, pc, (uptr)o);
1212  }
1213  return 0;
1214}
1215
1216TSAN_INTERCEPTOR(int, sem_init, void *s, int pshared, unsigned value) {
1217  SCOPED_TSAN_INTERCEPTOR(sem_init, s, pshared, value);
1218  int res = REAL(sem_init)(s, pshared, value);
1219  return res;
1220}
1221
1222TSAN_INTERCEPTOR(int, sem_destroy, void *s) {
1223  SCOPED_TSAN_INTERCEPTOR(sem_destroy, s);
1224  int res = REAL(sem_destroy)(s);
1225  return res;
1226}
1227
1228TSAN_INTERCEPTOR(int, sem_wait, void *s) {
1229  SCOPED_TSAN_INTERCEPTOR(sem_wait, s);
1230  int res = BLOCK_REAL(sem_wait)(s);
1231  if (res == 0) {
1232    Acquire(thr, pc, (uptr)s);
1233  }
1234  return res;
1235}
1236
1237TSAN_INTERCEPTOR(int, sem_trywait, void *s) {
1238  SCOPED_TSAN_INTERCEPTOR(sem_trywait, s);
1239  int res = BLOCK_REAL(sem_trywait)(s);
1240  if (res == 0) {
1241    Acquire(thr, pc, (uptr)s);
1242  }
1243  return res;
1244}
1245
1246TSAN_INTERCEPTOR(int, sem_timedwait, void *s, void *abstime) {
1247  SCOPED_TSAN_INTERCEPTOR(sem_timedwait, s, abstime);
1248  int res = BLOCK_REAL(sem_timedwait)(s, abstime);
1249  if (res == 0) {
1250    Acquire(thr, pc, (uptr)s);
1251  }
1252  return res;
1253}
1254
1255TSAN_INTERCEPTOR(int, sem_post, void *s) {
1256  SCOPED_TSAN_INTERCEPTOR(sem_post, s);
1257  Release(thr, pc, (uptr)s);
1258  int res = REAL(sem_post)(s);
1259  return res;
1260}
1261
1262TSAN_INTERCEPTOR(int, sem_getvalue, void *s, int *sval) {
1263  SCOPED_TSAN_INTERCEPTOR(sem_getvalue, s, sval);
1264  int res = REAL(sem_getvalue)(s, sval);
1265  if (res == 0) {
1266    Acquire(thr, pc, (uptr)s);
1267  }
1268  return res;
1269}
1270
1271TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1272  SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1273  int fd = REAL(open)(name, flags, mode);
1274  if (fd >= 0)
1275    FdFileCreate(thr, pc, fd);
1276  return fd;
1277}
1278
1279TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1280  SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1281  int fd = REAL(creat)(name, mode);
1282  if (fd >= 0)
1283    FdFileCreate(thr, pc, fd);
1284  return fd;
1285}
1286
1287TSAN_INTERCEPTOR(int, dup, int oldfd) {
1288  SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1289  int newfd = REAL(dup)(oldfd);
1290  if (newfd >= 0 && newfd != oldfd)
1291    FdDup(thr, pc, oldfd, newfd);
1292  return newfd;
1293}
1294
1295TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1296  SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1297  int newfd2 = REAL(dup2)(oldfd, newfd);
1298  if (newfd2 >= 0 && newfd2 != oldfd)
1299    FdDup(thr, pc, oldfd, newfd2);
1300  return newfd2;
1301}
1302
1303TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1304  SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1305  int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1306  if (newfd2 >= 0 && newfd2 != oldfd)
1307    FdDup(thr, pc, oldfd, newfd2);
1308  return newfd2;
1309}
1310
1311TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1312  SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1313  int fd = REAL(eventfd)(initval, flags);
1314  if (fd >= 0)
1315    FdEventCreate(thr, pc, fd);
1316  return fd;
1317}
1318
1319TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1320  SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1321  int fd = REAL(socket)(domain, type, protocol);
1322  if (fd >= 0)
1323    FdSocketCreate(thr, pc, fd);
1324  return fd;
1325}
1326
1327TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1328  SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1329  int res = REAL(connect)(fd, addr, addrlen);
1330  if (res == 0)
1331    FdSocketConnect(thr, pc, fd);
1332  return res;
1333}
1334
1335TSAN_INTERCEPTOR(int, accept, int fd, void *addr, unsigned *addrlen) {
1336  SCOPED_TSAN_INTERCEPTOR(accept, fd, addr, addrlen);
1337  int fd2 = REAL(accept)(fd, addr, addrlen);
1338  if (fd2 >= 0)
1339    FdSocketAccept(thr, pc, fd, fd2);
1340  return fd2;
1341}
1342
1343TSAN_INTERCEPTOR(int, accept4, int fd, void *addr, unsigned *addrlen, int f) {
1344  SCOPED_TSAN_INTERCEPTOR(accept4, fd, addr, addrlen, f);
1345  int fd2 = REAL(accept4)(fd, addr, addrlen, f);
1346  if (fd2 >= 0)
1347    FdSocketAccept(thr, pc, fd, fd2);
1348  return fd2;
1349}
1350
1351TSAN_INTERCEPTOR(int, epoll_create, int size) {
1352  SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1353  int fd = REAL(epoll_create)(size);
1354  if (fd >= 0)
1355    FdPollCreate(thr, pc, fd);
1356  return fd;
1357}
1358
1359TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1360  SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1361  int fd = REAL(epoll_create1)(flags);
1362  if (fd >= 0)
1363    FdPollCreate(thr, pc, fd);
1364  return fd;
1365}
1366
1367TSAN_INTERCEPTOR(int, close, int fd) {
1368  SCOPED_TSAN_INTERCEPTOR(close, fd);
1369  FdClose(thr, pc, fd);
1370  return REAL(close)(fd);
1371}
1372
1373TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1374  SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1375  int res = REAL(pipe)(pipefd);
1376  if (res == 0)
1377    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1378  return res;
1379}
1380
1381TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1382  SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1383  int res = REAL(pipe2)(pipefd, flags);
1384  if (res == 0)
1385    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1386  return res;
1387}
1388
1389TSAN_INTERCEPTOR(long_t, read, int fd, void *buf, long_t sz) {
1390  SCOPED_TSAN_INTERCEPTOR(read, fd, buf, sz);
1391  int res = REAL(read)(fd, buf, sz);
1392  if (res >= 0) {
1393    FdAcquire(thr, pc, fd);
1394  }
1395  return res;
1396}
1397
1398TSAN_INTERCEPTOR(long_t, pread, int fd, void *buf, long_t sz, unsigned off) {
1399  SCOPED_TSAN_INTERCEPTOR(pread, fd, buf, sz, off);
1400  int res = REAL(pread)(fd, buf, sz, off);
1401  if (res >= 0) {
1402    FdAcquire(thr, pc, fd);
1403  }
1404  return res;
1405}
1406
1407TSAN_INTERCEPTOR(long_t, pread64, int fd, void *buf, long_t sz, u64 off) {
1408  SCOPED_TSAN_INTERCEPTOR(pread64, fd, buf, sz, off);
1409  int res = REAL(pread64)(fd, buf, sz, off);
1410  if (res >= 0) {
1411    FdAcquire(thr, pc, fd);
1412  }
1413  return res;
1414}
1415
1416TSAN_INTERCEPTOR(long_t, readv, int fd, void *vec, int cnt) {
1417  SCOPED_TSAN_INTERCEPTOR(readv, fd, vec, cnt);
1418  int res = REAL(readv)(fd, vec, cnt);
1419  if (res >= 0) {
1420    FdAcquire(thr, pc, fd);
1421  }
1422  return res;
1423}
1424
1425TSAN_INTERCEPTOR(long_t, preadv64, int fd, void *vec, int cnt, u64 off) {
1426  SCOPED_TSAN_INTERCEPTOR(preadv64, fd, vec, cnt, off);
1427  int res = REAL(preadv64)(fd, vec, cnt, off);
1428  if (res >= 0) {
1429    FdAcquire(thr, pc, fd);
1430  }
1431  return res;
1432}
1433
1434TSAN_INTERCEPTOR(long_t, write, int fd, void *buf, long_t sz) {
1435  SCOPED_TSAN_INTERCEPTOR(write, fd, buf, sz);
1436  FdRelease(thr, pc, fd);
1437  int res = REAL(write)(fd, buf, sz);
1438  return res;
1439}
1440
1441TSAN_INTERCEPTOR(long_t, pwrite, int fd, void *buf, long_t sz, unsigned off) {
1442  SCOPED_TSAN_INTERCEPTOR(pwrite, fd, buf, sz, off);
1443  FdRelease(thr, pc, fd);
1444  int res = REAL(pwrite)(fd, buf, sz, off);
1445  return res;
1446}
1447
1448TSAN_INTERCEPTOR(long_t, pwrite64, int fd, void *buf, long_t sz, u64 off) {
1449  SCOPED_TSAN_INTERCEPTOR(pwrite64, fd, buf, sz, off);
1450  FdRelease(thr, pc, fd);
1451  int res = REAL(pwrite64)(fd, buf, sz, off);
1452  return res;
1453}
1454
1455TSAN_INTERCEPTOR(long_t, writev, int fd, void *vec, int cnt) {
1456  SCOPED_TSAN_INTERCEPTOR(writev, fd, vec, cnt);
1457  FdRelease(thr, pc, fd);
1458  int res = REAL(writev)(fd, vec, cnt);
1459  return res;
1460}
1461
1462TSAN_INTERCEPTOR(long_t, pwritev64, int fd, void *vec, int cnt, u64 off) {
1463  SCOPED_TSAN_INTERCEPTOR(pwritev64, fd, vec, cnt, off);
1464  FdRelease(thr, pc, fd);
1465  int res = REAL(pwritev64)(fd, vec, cnt, off);
1466  return res;
1467}
1468
1469TSAN_INTERCEPTOR(long_t, send, int fd, void *buf, long_t len, int flags) {
1470  SCOPED_TSAN_INTERCEPTOR(send, fd, buf, len, flags);
1471  FdRelease(thr, pc, fd);
1472  int res = REAL(send)(fd, buf, len, flags);
1473  return res;
1474}
1475
1476TSAN_INTERCEPTOR(long_t, sendmsg, int fd, void *msg, int flags) {
1477  SCOPED_TSAN_INTERCEPTOR(sendmsg, fd, msg, flags);
1478  FdRelease(thr, pc, fd);
1479  int res = REAL(sendmsg)(fd, msg, flags);
1480  return res;
1481}
1482
1483TSAN_INTERCEPTOR(long_t, recv, int fd, void *buf, long_t len, int flags) {
1484  SCOPED_TSAN_INTERCEPTOR(recv, fd, buf, len, flags);
1485  int res = REAL(recv)(fd, buf, len, flags);
1486  if (res >= 0) {
1487    FdAcquire(thr, pc, fd);
1488  }
1489  return res;
1490}
1491
1492TSAN_INTERCEPTOR(long_t, recvmsg, int fd, void *msg, int flags) {
1493  SCOPED_TSAN_INTERCEPTOR(recvmsg, fd, msg, flags);
1494  int res = REAL(recvmsg)(fd, msg, flags);
1495  if (res >= 0) {
1496    FdAcquire(thr, pc, fd);
1497  }
1498  return res;
1499}
1500
1501TSAN_INTERCEPTOR(int, unlink, char *path) {
1502  SCOPED_TSAN_INTERCEPTOR(unlink, path);
1503  Release(thr, pc, file2addr(path));
1504  int res = REAL(unlink)(path);
1505  return res;
1506}
1507
1508TSAN_INTERCEPTOR(void*, fopen, char *path, char *mode) {
1509  SCOPED_TSAN_INTERCEPTOR(fopen, path, mode);
1510  void *res = REAL(fopen)(path, mode);
1511  Acquire(thr, pc, file2addr(path));
1512  return res;
1513}
1514
1515TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1516  SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1517  MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1518  return REAL(fread)(ptr, size, nmemb, f);
1519}
1520
1521TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1522  SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1523  MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1524  return REAL(fwrite)(p, size, nmemb, f);
1525}
1526
1527TSAN_INTERCEPTOR(int, puts, const char *s) {
1528  SCOPED_TSAN_INTERCEPTOR(puts, s);
1529  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1530  return REAL(puts)(s);
1531}
1532
1533TSAN_INTERCEPTOR(int, rmdir, char *path) {
1534  SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1535  Release(thr, pc, dir2addr(path));
1536  int res = REAL(rmdir)(path);
1537  return res;
1538}
1539
1540TSAN_INTERCEPTOR(void*, opendir, char *path) {
1541  SCOPED_TSAN_INTERCEPTOR(opendir, path);
1542  void *res = REAL(opendir)(path);
1543  Acquire(thr, pc, dir2addr(path));
1544  return res;
1545}
1546
1547TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1548  SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1549  if (op == EPOLL_CTL_ADD) {
1550    FdRelease(thr, pc, epfd);
1551  }
1552  int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1553  return res;
1554}
1555
1556TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1557  SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1558  int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1559  if (res > 0) {
1560    FdAcquire(thr, pc, epfd);
1561  }
1562  return res;
1563}
1564
1565TSAN_INTERCEPTOR(int, poll, void *fds, long_t nfds, int timeout) {
1566  SCOPED_TSAN_INTERCEPTOR(poll, fds, nfds, timeout);
1567  int res = BLOCK_REAL(poll)(fds, nfds, timeout);
1568  return res;
1569}
1570
1571static void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1572    my_siginfo_t *info, void *ctx) {
1573  ThreadState *thr = cur_thread();
1574  SignalContext *sctx = SigCtx(thr);
1575  // Don't mess with synchronous signals.
1576  if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1577      sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE ||
1578      // If we are sending signal to ourselves, we must process it now.
1579      (sctx && sig == sctx->int_signal_send) ||
1580      // If we are in blocking function, we can safely process it now
1581      // (but check if we are in a recursive interceptor,
1582      // i.e. pthread_join()->munmap()).
1583      (sctx && sctx->in_blocking_func == 1 && thr->in_rtl == 1)) {
1584    CHECK(thr->in_rtl == 0 || thr->in_rtl == 1);
1585    int in_rtl = thr->in_rtl;
1586    thr->in_rtl = 0;
1587    CHECK_EQ(thr->in_signal_handler, false);
1588    thr->in_signal_handler = true;
1589    if (sigact)
1590      sigactions[sig].sa_sigaction(sig, info, ctx);
1591    else
1592      sigactions[sig].sa_handler(sig);
1593    CHECK_EQ(thr->in_signal_handler, true);
1594    thr->in_signal_handler = false;
1595    thr->in_rtl = in_rtl;
1596    return;
1597  }
1598
1599  if (sctx == 0)
1600    return;
1601  SignalDesc *signal = &sctx->pending_signals[sig];
1602  if (signal->armed == false) {
1603    signal->armed = true;
1604    signal->sigaction = sigact;
1605    if (info)
1606      internal_memcpy(&signal->siginfo, info, sizeof(*info));
1607    if (ctx)
1608      internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1609    sctx->pending_signal_count++;
1610  }
1611}
1612
1613static void rtl_sighandler(int sig) {
1614  rtl_generic_sighandler(false, sig, 0, 0);
1615}
1616
1617static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1618  rtl_generic_sighandler(true, sig, info, ctx);
1619}
1620
1621TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1622  SCOPED_TSAN_INTERCEPTOR(sigaction, sig, act, old);
1623  if (old)
1624    internal_memcpy(old, &sigactions[sig], sizeof(*old));
1625  if (act == 0)
1626    return 0;
1627  internal_memcpy(&sigactions[sig], act, sizeof(*act));
1628  sigaction_t newact;
1629  internal_memcpy(&newact, act, sizeof(newact));
1630  sigfillset(&newact.sa_mask);
1631  if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1632    if (newact.sa_flags & SA_SIGINFO)
1633      newact.sa_sigaction = rtl_sigaction;
1634    else
1635      newact.sa_handler = rtl_sighandler;
1636  }
1637  int res = REAL(sigaction)(sig, &newact, 0);
1638  return res;
1639}
1640
1641TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1642  sigaction_t act;
1643  act.sa_handler = h;
1644  REAL(memset)(&act.sa_mask, -1, sizeof(act.sa_mask));
1645  act.sa_flags = 0;
1646  sigaction_t old;
1647  int res = sigaction(sig, &act, &old);
1648  if (res)
1649    return SIG_ERR;
1650  return old.sa_handler;
1651}
1652
1653TSAN_INTERCEPTOR(int, raise, int sig) {
1654  SCOPED_TSAN_INTERCEPTOR(raise, sig);
1655  SignalContext *sctx = SigCtx(thr);
1656  CHECK_NE(sctx, 0);
1657  int prev = sctx->int_signal_send;
1658  sctx->int_signal_send = sig;
1659  int res = REAL(raise)(sig);
1660  CHECK_EQ(sctx->int_signal_send, sig);
1661  sctx->int_signal_send = prev;
1662  return res;
1663}
1664
1665TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1666  SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1667  SignalContext *sctx = SigCtx(thr);
1668  CHECK_NE(sctx, 0);
1669  int prev = sctx->int_signal_send;
1670  if (pid == GetPid()) {
1671    sctx->int_signal_send = sig;
1672  }
1673  int res = REAL(kill)(pid, sig);
1674  if (pid == GetPid()) {
1675    CHECK_EQ(sctx->int_signal_send, sig);
1676    sctx->int_signal_send = prev;
1677  }
1678  return res;
1679}
1680
1681TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1682  SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1683  SignalContext *sctx = SigCtx(thr);
1684  CHECK_NE(sctx, 0);
1685  int prev = sctx->int_signal_send;
1686  if (tid == pthread_self()) {
1687    sctx->int_signal_send = sig;
1688  }
1689  int res = REAL(pthread_kill)(tid, sig);
1690  if (tid == pthread_self()) {
1691    CHECK_EQ(sctx->int_signal_send, sig);
1692    sctx->int_signal_send = prev;
1693  }
1694  return res;
1695}
1696
1697TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
1698  SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
1699  // It's intercepted merely to process pending signals.
1700  return REAL(gettimeofday)(tv, tz);
1701}
1702
1703// Linux kernel has a bug that leads to kernel deadlock if a process
1704// maps TBs of memory and then calls mlock().
1705static void MlockIsUnsupported() {
1706  static atomic_uint8_t printed;
1707  if (atomic_exchange(&printed, 1, memory_order_relaxed))
1708    return;
1709  Printf("INFO: ThreadSanitizer ignores mlock/mlockall/munlock/munlockall\n");
1710}
1711
1712TSAN_INTERCEPTOR(int, mlock, const void *addr, uptr len) {
1713  MlockIsUnsupported();
1714  return 0;
1715}
1716
1717TSAN_INTERCEPTOR(int, munlock, const void *addr, uptr len) {
1718  MlockIsUnsupported();
1719  return 0;
1720}
1721
1722TSAN_INTERCEPTOR(int, mlockall, int flags) {
1723  MlockIsUnsupported();
1724  return 0;
1725}
1726
1727TSAN_INTERCEPTOR(int, munlockall, void) {
1728  MlockIsUnsupported();
1729  return 0;
1730}
1731
1732namespace __tsan {
1733
1734void ProcessPendingSignals(ThreadState *thr) {
1735  CHECK_EQ(thr->in_rtl, 0);
1736  SignalContext *sctx = SigCtx(thr);
1737  if (sctx == 0 || sctx->pending_signal_count == 0 || thr->in_signal_handler)
1738    return;
1739  Context *ctx = CTX();
1740  thr->in_signal_handler = true;
1741  sctx->pending_signal_count = 0;
1742  // These are too big for stack.
1743  static THREADLOCAL sigset_t emptyset, oldset;
1744  sigfillset(&emptyset);
1745  pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
1746  for (int sig = 0; sig < kSigCount; sig++) {
1747    SignalDesc *signal = &sctx->pending_signals[sig];
1748    if (signal->armed) {
1749      signal->armed = false;
1750      if (sigactions[sig].sa_handler != SIG_DFL
1751          && sigactions[sig].sa_handler != SIG_IGN) {
1752        // Insure that the handler does not spoil errno.
1753        const int saved_errno = errno;
1754        errno = 0;
1755        if (signal->sigaction)
1756          sigactions[sig].sa_sigaction(sig, &signal->siginfo, &signal->ctx);
1757        else
1758          sigactions[sig].sa_handler(sig);
1759        if (flags()->report_bugs && errno != 0) {
1760          ScopedInRtl in_rtl;
1761          __tsan::StackTrace stack;
1762          uptr pc = signal->sigaction ?
1763              (uptr)sigactions[sig].sa_sigaction :
1764              (uptr)sigactions[sig].sa_handler;
1765          stack.Init(&pc, 1);
1766          ScopedReport rep(ReportTypeErrnoInSignal);
1767          if (!IsFiredSuppression(ctx, rep, stack)) {
1768            rep.AddStack(&stack);
1769            OutputReport(ctx, rep, rep.GetReport()->stacks[0]);
1770          }
1771        }
1772        errno = saved_errno;
1773      }
1774    }
1775  }
1776  pthread_sigmask(SIG_SETMASK, &oldset, 0);
1777  CHECK_EQ(thr->in_signal_handler, true);
1778  thr->in_signal_handler = false;
1779}
1780
1781static void unreachable() {
1782  Printf("FATAL: ThreadSanitizer: unreachable called\n");
1783  Die();
1784}
1785
1786void InitializeInterceptors() {
1787  CHECK_GT(cur_thread()->in_rtl, 0);
1788
1789  // We need to setup it early, because functions like dlsym() can call it.
1790  REAL(memset) = internal_memset;
1791  REAL(memcpy) = internal_memcpy;
1792  REAL(memcmp) = internal_memcmp;
1793
1794  TSAN_INTERCEPT(longjmp);
1795  TSAN_INTERCEPT(siglongjmp);
1796
1797  TSAN_INTERCEPT(malloc);
1798  TSAN_INTERCEPT(__libc_memalign);
1799  TSAN_INTERCEPT(calloc);
1800  TSAN_INTERCEPT(realloc);
1801  TSAN_INTERCEPT(free);
1802  TSAN_INTERCEPT(cfree);
1803  TSAN_INTERCEPT(mmap);
1804  TSAN_INTERCEPT(mmap64);
1805  TSAN_INTERCEPT(munmap);
1806  TSAN_INTERCEPT(memalign);
1807  TSAN_INTERCEPT(valloc);
1808  TSAN_INTERCEPT(pvalloc);
1809  TSAN_INTERCEPT(posix_memalign);
1810
1811  TSAN_INTERCEPT(strlen);
1812  TSAN_INTERCEPT(memset);
1813  TSAN_INTERCEPT(memcpy);
1814  TSAN_INTERCEPT(strcmp);
1815  TSAN_INTERCEPT(memchr);
1816  TSAN_INTERCEPT(memrchr);
1817  TSAN_INTERCEPT(memmove);
1818  TSAN_INTERCEPT(memcmp);
1819  TSAN_INTERCEPT(strchr);
1820  TSAN_INTERCEPT(strchrnul);
1821  TSAN_INTERCEPT(strrchr);
1822  TSAN_INTERCEPT(strncmp);
1823  TSAN_INTERCEPT(strcpy);  // NOLINT
1824  TSAN_INTERCEPT(strncpy);
1825  TSAN_INTERCEPT(strstr);
1826
1827  TSAN_INTERCEPT(pthread_create);
1828  TSAN_INTERCEPT(pthread_join);
1829  TSAN_INTERCEPT(pthread_detach);
1830
1831  TSAN_INTERCEPT(pthread_mutex_init);
1832  TSAN_INTERCEPT(pthread_mutex_destroy);
1833  TSAN_INTERCEPT(pthread_mutex_lock);
1834  TSAN_INTERCEPT(pthread_mutex_trylock);
1835  TSAN_INTERCEPT(pthread_mutex_timedlock);
1836  TSAN_INTERCEPT(pthread_mutex_unlock);
1837
1838  TSAN_INTERCEPT(pthread_spin_init);
1839  TSAN_INTERCEPT(pthread_spin_destroy);
1840  TSAN_INTERCEPT(pthread_spin_lock);
1841  TSAN_INTERCEPT(pthread_spin_trylock);
1842  TSAN_INTERCEPT(pthread_spin_unlock);
1843
1844  TSAN_INTERCEPT(pthread_rwlock_init);
1845  TSAN_INTERCEPT(pthread_rwlock_destroy);
1846  TSAN_INTERCEPT(pthread_rwlock_rdlock);
1847  TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
1848  TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
1849  TSAN_INTERCEPT(pthread_rwlock_wrlock);
1850  TSAN_INTERCEPT(pthread_rwlock_trywrlock);
1851  TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
1852  TSAN_INTERCEPT(pthread_rwlock_unlock);
1853
1854  TSAN_INTERCEPT(pthread_cond_init);
1855  TSAN_INTERCEPT(pthread_cond_destroy);
1856  TSAN_INTERCEPT(pthread_cond_signal);
1857  TSAN_INTERCEPT(pthread_cond_broadcast);
1858  TSAN_INTERCEPT(pthread_cond_wait);
1859  TSAN_INTERCEPT(pthread_cond_timedwait);
1860
1861  TSAN_INTERCEPT(pthread_barrier_init);
1862  TSAN_INTERCEPT(pthread_barrier_destroy);
1863  TSAN_INTERCEPT(pthread_barrier_wait);
1864
1865  TSAN_INTERCEPT(pthread_once);
1866
1867  TSAN_INTERCEPT(sem_init);
1868  TSAN_INTERCEPT(sem_destroy);
1869  TSAN_INTERCEPT(sem_wait);
1870  TSAN_INTERCEPT(sem_trywait);
1871  TSAN_INTERCEPT(sem_timedwait);
1872  TSAN_INTERCEPT(sem_post);
1873  TSAN_INTERCEPT(sem_getvalue);
1874
1875  TSAN_INTERCEPT(open);
1876  TSAN_INTERCEPT(creat);
1877  TSAN_INTERCEPT(dup);
1878  TSAN_INTERCEPT(dup2);
1879  TSAN_INTERCEPT(dup3);
1880  TSAN_INTERCEPT(eventfd);
1881  TSAN_INTERCEPT(socket);
1882  TSAN_INTERCEPT(connect);
1883  TSAN_INTERCEPT(accept);
1884  TSAN_INTERCEPT(accept4);
1885  TSAN_INTERCEPT(epoll_create);
1886  TSAN_INTERCEPT(epoll_create1);
1887  TSAN_INTERCEPT(close);
1888  TSAN_INTERCEPT(pipe);
1889  TSAN_INTERCEPT(pipe2);
1890
1891  TSAN_INTERCEPT(read);
1892  TSAN_INTERCEPT(pread);
1893  TSAN_INTERCEPT(pread64);
1894  TSAN_INTERCEPT(readv);
1895  TSAN_INTERCEPT(preadv64);
1896  TSAN_INTERCEPT(write);
1897  TSAN_INTERCEPT(pwrite);
1898  TSAN_INTERCEPT(pwrite64);
1899  TSAN_INTERCEPT(writev);
1900  TSAN_INTERCEPT(pwritev64);
1901  TSAN_INTERCEPT(send);
1902  TSAN_INTERCEPT(sendmsg);
1903  TSAN_INTERCEPT(recv);
1904  TSAN_INTERCEPT(recvmsg);
1905
1906  TSAN_INTERCEPT(unlink);
1907  TSAN_INTERCEPT(fopen);
1908  TSAN_INTERCEPT(fread);
1909  TSAN_INTERCEPT(fwrite);
1910  TSAN_INTERCEPT(puts);
1911  TSAN_INTERCEPT(rmdir);
1912  TSAN_INTERCEPT(opendir);
1913
1914  TSAN_INTERCEPT(epoll_ctl);
1915  TSAN_INTERCEPT(epoll_wait);
1916  TSAN_INTERCEPT(poll);
1917
1918  TSAN_INTERCEPT(sigaction);
1919  TSAN_INTERCEPT(signal);
1920  TSAN_INTERCEPT(raise);
1921  TSAN_INTERCEPT(kill);
1922  TSAN_INTERCEPT(pthread_kill);
1923  TSAN_INTERCEPT(sleep);
1924  TSAN_INTERCEPT(usleep);
1925  TSAN_INTERCEPT(nanosleep);
1926  TSAN_INTERCEPT(gettimeofday);
1927
1928  TSAN_INTERCEPT(mlock);
1929  TSAN_INTERCEPT(munlock);
1930  TSAN_INTERCEPT(mlockall);
1931  TSAN_INTERCEPT(munlockall);
1932
1933  // Need to setup it, because interceptors check that the function is resolved.
1934  // But atexit is emitted directly into the module, so can't be resolved.
1935  REAL(atexit) = (int(*)(void(*)()))unreachable;
1936  atexit_ctx = new(internal_alloc(MBlockAtExit, sizeof(AtExitContext)))
1937      AtExitContext();
1938
1939  if (__cxa_atexit(&finalize, 0, 0)) {
1940    Printf("ThreadSanitizer: failed to setup atexit callback\n");
1941    Die();
1942  }
1943
1944  if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
1945    Printf("ThreadSanitizer: failed to create thread key\n");
1946    Die();
1947  }
1948
1949  FdInit();
1950}
1951
1952void internal_start_thread(void(*func)(void *arg), void *arg) {
1953  void *th;
1954  REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
1955  REAL(pthread_detach)(th);
1956}
1957
1958}  // namespace __tsan
1959