tsan_interceptors.cc revision 917f62eaa5c2839155f703dee114a767ff81cca5 
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.inc
14//===----------------------------------------------------------------------===//
15
16#include "sanitizer_common/sanitizer_atomic.h"
17#include "sanitizer_common/sanitizer_libc.h"
18#include "sanitizer_common/sanitizer_linux.h"
19#include "sanitizer_common/sanitizer_platform_limits_posix.h"
20#include "sanitizer_common/sanitizer_placement_new.h"
21#include "sanitizer_common/sanitizer_stacktrace.h"
22#include "interception/interception.h"
23#include "tsan_interface.h"
24#include "tsan_platform.h"
25#include "tsan_rtl.h"
26#include "tsan_mman.h"
27#include "tsan_fd.h"
28
29using namespace __tsan;  // NOLINT
30
31const int kSigCount = 64;
32
33struct my_siginfo_t {
34  // The size is determined by looking at sizeof of real siginfo_t on linux.
35  u64 opaque[128 / sizeof(u64)];
36};
37
38struct sigset_t {
39  // The size is determined by looking at sizeof of real sigset_t on linux.
40  u64 val[128 / sizeof(u64)];
41};
42
43struct ucontext_t {
44  // The size is determined by looking at sizeof of real ucontext_t on linux.
45  u64 opaque[936 / sizeof(u64) + 1];
46};
47
48extern "C" int pthread_attr_init(void *attr);
49extern "C" int pthread_attr_destroy(void *attr);
50extern "C" int pthread_attr_getdetachstate(void *attr, int *v);
51extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
52extern "C" int pthread_attr_getstacksize(void *attr, uptr *stacksize);
53extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
54extern "C" int pthread_setspecific(unsigned key, const void *v);
55extern "C" int pthread_mutexattr_gettype(void *a, int *type);
56extern "C" int pthread_yield();
57extern "C" int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);
58extern "C" int sigfillset(sigset_t *set);
59extern "C" void *pthread_self();
60extern "C" void _exit(int status);
61extern "C" int *__errno_location();
62extern "C" int fileno_unlocked(void *stream);
63extern "C" void *__libc_malloc(uptr size);
64extern "C" void *__libc_calloc(uptr size, uptr n);
65extern "C" void *__libc_realloc(void *ptr, uptr size);
66extern "C" void __libc_free(void *ptr);
67extern "C" int mallopt(int param, int value);
68const int PTHREAD_MUTEX_RECURSIVE = 1;
69const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
70const int kPthreadAttrSize = 56;
71const int EINVAL = 22;
72const int EBUSY = 16;
73const int EPOLL_CTL_ADD = 1;
74const int SIGILL = 4;
75const int SIGABRT = 6;
76const int SIGFPE = 8;
77const int SIGSEGV = 11;
78const int SIGPIPE = 13;
79const int SIGBUS = 7;
80void *const MAP_FAILED = (void*)-1;
81const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
82const int MAP_FIXED = 0x10;
83typedef long long_t;  // NOLINT
84
85// From /usr/include/unistd.h
86# define F_ULOCK 0      /* Unlock a previously locked region.  */
87# define F_LOCK  1      /* Lock a region for exclusive use.  */
88# define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
89# define F_TEST  3      /* Test a region for other processes locks.  */
90
91typedef void (*sighandler_t)(int sig);
92
93#define errno (*__errno_location())
94
95struct sigaction_t {
96  union {
97    sighandler_t sa_handler;
98    void (*sa_sigaction)(int sig, my_siginfo_t *siginfo, void *uctx);
99  };
100  sigset_t sa_mask;
101  int sa_flags;
102  void (*sa_restorer)();
103};
104
105const sighandler_t SIG_DFL = (sighandler_t)0;
106const sighandler_t SIG_IGN = (sighandler_t)1;
107const sighandler_t SIG_ERR = (sighandler_t)-1;
108const int SA_SIGINFO = 4;
109const int SIG_SETMASK = 2;
110
111namespace std {
112struct nothrow_t {};
113}  // namespace std
114
115static sigaction_t sigactions[kSigCount];
116
117namespace __tsan {
118struct SignalDesc {
119  bool armed;
120  bool sigaction;
121  my_siginfo_t siginfo;
122  ucontext_t ctx;
123};
124
125struct SignalContext {
126  int in_blocking_func;
127  int int_signal_send;
128  int pending_signal_count;
129  SignalDesc pending_signals[kSigCount];
130};
131}  // namespace __tsan
132
133static SignalContext *SigCtx(ThreadState *thr) {
134  SignalContext *ctx = (SignalContext*)thr->signal_ctx;
135  if (ctx == 0 && thr->is_alive) {
136    ScopedInRtl in_rtl;
137    ctx = (SignalContext*)MmapOrDie(sizeof(*ctx), "SignalContext");
138    MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
139    thr->signal_ctx = ctx;
140  }
141  return ctx;
142}
143
144static unsigned g_thread_finalize_key;
145
146class ScopedInterceptor {
147 public:
148  ScopedInterceptor(ThreadState *thr, const char *fname, uptr pc);
149  ~ScopedInterceptor();
150 private:
151  ThreadState *const thr_;
152  const int in_rtl_;
153};
154
155ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
156                                     uptr pc)
157    : thr_(thr)
158    , in_rtl_(thr->in_rtl) {
159  if (thr_->in_rtl == 0) {
160    Initialize(thr);
161    FuncEntry(thr, pc);
162    thr_->in_rtl++;
163    DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
164  } else {
165    thr_->in_rtl++;
166  }
167}
168
169ScopedInterceptor::~ScopedInterceptor() {
170  thr_->in_rtl--;
171  if (thr_->in_rtl == 0) {
172    FuncExit(thr_);
173    ProcessPendingSignals(thr_);
174  }
175  CHECK_EQ(in_rtl_, thr_->in_rtl);
176}
177
178#define SCOPED_INTERCEPTOR_RAW(func, ...) \
179    ThreadState *thr = cur_thread(); \
180    StatInc(thr, StatInterceptor); \
181    StatInc(thr, StatInt_##func); \
182    const uptr caller_pc = GET_CALLER_PC(); \
183    ScopedInterceptor si(thr, #func, caller_pc); \
184    const uptr pc = __sanitizer::StackTrace::GetPreviousInstructionPc( \
185        __sanitizer::StackTrace::GetCurrentPc()); \
186    (void)pc; \
187/**/
188
189#define SCOPED_TSAN_INTERCEPTOR(func, ...) \
190    SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
191    if (REAL(func) == 0) { \
192      Printf("FATAL: ThreadSanitizer: failed to intercept %s\n", #func); \
193      Die(); \
194    } \
195    if (thr->in_rtl > 1) \
196      return REAL(func)(__VA_ARGS__); \
197/**/
198
199#define TSAN_INTERCEPTOR(ret, func, ...) INTERCEPTOR(ret, func, __VA_ARGS__)
200#define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
201
202#define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
203
204struct BlockingCall {
205  explicit BlockingCall(ThreadState *thr)
206      : ctx(SigCtx(thr)) {
207    ctx->in_blocking_func++;
208  }
209
210  ~BlockingCall() {
211    ctx->in_blocking_func--;
212  }
213
214  SignalContext *ctx;
215};
216
217TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
218  SCOPED_TSAN_INTERCEPTOR(sleep, sec);
219  unsigned res = BLOCK_REAL(sleep)(sec);
220  AfterSleep(thr, pc);
221  return res;
222}
223
224TSAN_INTERCEPTOR(int, usleep, long_t usec) {
225  SCOPED_TSAN_INTERCEPTOR(usleep, usec);
226  int res = BLOCK_REAL(usleep)(usec);
227  AfterSleep(thr, pc);
228  return res;
229}
230
231TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
232  SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
233  int res = BLOCK_REAL(nanosleep)(req, rem);
234  AfterSleep(thr, pc);
235  return res;
236}
237
238class AtExitContext {
239 public:
240  AtExitContext()
241    : mtx_(MutexTypeAtExit, StatMtxAtExit)
242    , pos_() {
243  }
244
245  typedef void(*atexit_t)();
246
247  int atexit(ThreadState *thr, uptr pc, bool is_on_exit,
248             atexit_t f, void *arg) {
249    Lock l(&mtx_);
250    if (pos_ == kMaxAtExit)
251      return 1;
252    Release(thr, pc, (uptr)this);
253    stack_[pos_] = f;
254    args_[pos_] = arg;
255    is_on_exits_[pos_] = is_on_exit;
256    pos_++;
257    return 0;
258  }
259
260  void exit(ThreadState *thr, uptr pc) {
261    CHECK_EQ(thr->in_rtl, 0);
262    for (;;) {
263      atexit_t f = 0;
264      void *arg = 0;
265      bool is_on_exit = false;
266      {
267        Lock l(&mtx_);
268        if (pos_) {
269          pos_--;
270          f = stack_[pos_];
271          arg = args_[pos_];
272          is_on_exit = is_on_exits_[pos_];
273          ScopedInRtl in_rtl;
274          Acquire(thr, pc, (uptr)this);
275        }
276      }
277      if (f == 0)
278        break;
279      DPrintf("#%d: executing atexit func %p\n", thr->tid, f);
280      CHECK_EQ(thr->in_rtl, 0);
281      if (is_on_exit)
282        ((void(*)(int status, void *arg))f)(0, arg);
283      else
284        ((void(*)(void *arg, void *dso))f)(arg, 0);
285    }
286  }
287
288 private:
289  static const int kMaxAtExit = 128;
290  Mutex mtx_;
291  atexit_t stack_[kMaxAtExit];
292  void *args_[kMaxAtExit];
293  bool is_on_exits_[kMaxAtExit];
294  int pos_;
295};
296
297static AtExitContext *atexit_ctx;
298
299TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
300  if (cur_thread()->in_symbolizer)
301    return 0;
302  SCOPED_TSAN_INTERCEPTOR(atexit, f);
303  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, 0);
304}
305
306TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
307  if (cur_thread()->in_symbolizer)
308    return 0;
309  SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
310  return atexit_ctx->atexit(thr, pc, true, (void(*)())f, arg);
311}
312
313TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {
314  if (cur_thread()->in_symbolizer)
315    return 0;
316  SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
317  if (dso)
318    return REAL(__cxa_atexit)(f, arg, dso);
319  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, arg);
320}
321
322// Cleanup old bufs.
323static void JmpBufGarbageCollect(ThreadState *thr, uptr sp) {
324  for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
325    JmpBuf *buf = &thr->jmp_bufs[i];
326    if (buf->sp <= sp) {
327      uptr sz = thr->jmp_bufs.Size();
328      thr->jmp_bufs[i] = thr->jmp_bufs[sz - 1];
329      thr->jmp_bufs.PopBack();
330      i--;
331    }
332  }
333}
334
335static void SetJmp(ThreadState *thr, uptr sp, uptr mangled_sp) {
336  if (thr->shadow_stack_pos == 0)  // called from libc guts during bootstrap
337    return;
338  // Cleanup old bufs.
339  JmpBufGarbageCollect(thr, sp);
340  // Remember the buf.
341  JmpBuf *buf = thr->jmp_bufs.PushBack();
342  buf->sp = sp;
343  buf->mangled_sp = mangled_sp;
344  buf->shadow_stack_pos = thr->shadow_stack_pos;
345}
346
347static void LongJmp(ThreadState *thr, uptr *env) {
348  uptr mangled_sp = env[6];
349  // Find the saved buf by mangled_sp.
350  for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
351    JmpBuf *buf = &thr->jmp_bufs[i];
352    if (buf->mangled_sp == mangled_sp) {
353      CHECK_GE(thr->shadow_stack_pos, buf->shadow_stack_pos);
354      // Unwind the stack.
355      while (thr->shadow_stack_pos > buf->shadow_stack_pos)
356        FuncExit(thr);
357      JmpBufGarbageCollect(thr, buf->sp - 1);  // do not collect buf->sp
358      return;
359    }
360  }
361  Printf("ThreadSanitizer: can't find longjmp buf\n");
362  CHECK(0);
363}
364
365extern "C" void __tsan_setjmp(uptr sp, uptr mangled_sp) {
366  ScopedInRtl in_rtl;
367  SetJmp(cur_thread(), sp, mangled_sp);
368}
369
370// Not called.  Merely to satisfy TSAN_INTERCEPT().
371extern "C" int __interceptor_setjmp(void *env) {
372  CHECK(0);
373  return 0;
374}
375
376extern "C" int __interceptor__setjmp(void *env) {
377  CHECK(0);
378  return 0;
379}
380
381extern "C" int __interceptor_sigsetjmp(void *env) {
382  CHECK(0);
383  return 0;
384}
385
386extern "C" int __interceptor___sigsetjmp(void *env) {
387  CHECK(0);
388  return 0;
389}
390
391extern "C" int setjmp(void *env);
392extern "C" int _setjmp(void *env);
393extern "C" int sigsetjmp(void *env);
394extern "C" int __sigsetjmp(void *env);
395DEFINE_REAL(int, setjmp, void *env)
396DEFINE_REAL(int, _setjmp, void *env)
397DEFINE_REAL(int, sigsetjmp, void *env)
398DEFINE_REAL(int, __sigsetjmp, void *env)
399
400TSAN_INTERCEPTOR(void, longjmp, uptr *env, int val) {
401  {
402    SCOPED_TSAN_INTERCEPTOR(longjmp, env, val);
403  }
404  LongJmp(cur_thread(), env);
405  REAL(longjmp)(env, val);
406}
407
408TSAN_INTERCEPTOR(void, siglongjmp, uptr *env, int val) {
409  {
410    SCOPED_TSAN_INTERCEPTOR(siglongjmp, env, val);
411  }
412  LongJmp(cur_thread(), env);
413  REAL(siglongjmp)(env, val);
414}
415
416TSAN_INTERCEPTOR(void*, malloc, uptr size) {
417  if (cur_thread()->in_symbolizer)
418    return __libc_malloc(size);
419  void *p = 0;
420  {
421    SCOPED_INTERCEPTOR_RAW(malloc, size);
422    p = user_alloc(thr, pc, size);
423  }
424  invoke_malloc_hook(p, size);
425  return p;
426}
427
428TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
429  SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
430  return user_alloc(thr, pc, sz, align);
431}
432
433TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
434  if (cur_thread()->in_symbolizer)
435    return __libc_calloc(size, n);
436  if (__sanitizer::CallocShouldReturnNullDueToOverflow(size, n)) return 0;
437  void *p = 0;
438  {
439    SCOPED_INTERCEPTOR_RAW(calloc, size, n);
440    p = user_alloc(thr, pc, n * size);
441    if (p)
442      internal_memset(p, 0, n * size);
443  }
444  invoke_malloc_hook(p, n * size);
445  return p;
446}
447
448TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
449  if (cur_thread()->in_symbolizer)
450    return __libc_realloc(p, size);
451  if (p)
452    invoke_free_hook(p);
453  {
454    SCOPED_INTERCEPTOR_RAW(realloc, p, size);
455    p = user_realloc(thr, pc, p, size);
456  }
457  invoke_malloc_hook(p, size);
458  return p;
459}
460
461TSAN_INTERCEPTOR(void, free, void *p) {
462  if (p == 0)
463    return;
464  if (cur_thread()->in_symbolizer)
465    return __libc_free(p);
466  invoke_free_hook(p);
467  SCOPED_INTERCEPTOR_RAW(free, p);
468  user_free(thr, pc, p);
469}
470
471TSAN_INTERCEPTOR(void, cfree, void *p) {
472  if (p == 0)
473    return;
474  if (cur_thread()->in_symbolizer)
475    return __libc_free(p);
476  invoke_free_hook(p);
477  SCOPED_INTERCEPTOR_RAW(cfree, p);
478  user_free(thr, pc, p);
479}
480
481TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {
482  SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);
483  return user_alloc_usable_size(thr, pc, p);
484}
485
486#define OPERATOR_NEW_BODY(mangled_name) \
487  if (cur_thread()->in_symbolizer) \
488    return __libc_malloc(size); \
489  void *p = 0; \
490  {  \
491    SCOPED_INTERCEPTOR_RAW(mangled_name, size); \
492    p = user_alloc(thr, pc, size); \
493  }  \
494  invoke_malloc_hook(p, size);  \
495  return p;
496
497void *operator new(__sanitizer::uptr size) {
498  OPERATOR_NEW_BODY(_Znwm);
499}
500void *operator new[](__sanitizer::uptr size) {
501  OPERATOR_NEW_BODY(_Znam);
502}
503void *operator new(__sanitizer::uptr size, std::nothrow_t const&) {
504  OPERATOR_NEW_BODY(_ZnwmRKSt9nothrow_t);
505}
506void *operator new[](__sanitizer::uptr size, std::nothrow_t const&) {
507  OPERATOR_NEW_BODY(_ZnamRKSt9nothrow_t);
508}
509
510#define OPERATOR_DELETE_BODY(mangled_name) \
511  if (ptr == 0) return;  \
512  if (cur_thread()->in_symbolizer) \
513    return __libc_free(ptr); \
514  invoke_free_hook(ptr);  \
515  SCOPED_INTERCEPTOR_RAW(mangled_name, ptr);  \
516  user_free(thr, pc, ptr);
517
518void operator delete(void *ptr) {
519  OPERATOR_DELETE_BODY(_ZdlPv);
520}
521void operator delete[](void *ptr) {
522  OPERATOR_DELETE_BODY(_ZdlPvRKSt9nothrow_t);
523}
524void operator delete(void *ptr, std::nothrow_t const&) {
525  OPERATOR_DELETE_BODY(_ZdaPv);
526}
527void operator delete[](void *ptr, std::nothrow_t const&) {
528  OPERATOR_DELETE_BODY(_ZdaPvRKSt9nothrow_t);
529}
530
531TSAN_INTERCEPTOR(uptr, strlen, const char *s) {
532  SCOPED_TSAN_INTERCEPTOR(strlen, s);
533  uptr len = internal_strlen(s);
534  MemoryAccessRange(thr, pc, (uptr)s, len + 1, false);
535  return len;
536}
537
538TSAN_INTERCEPTOR(void*, memset, void *dst, int v, uptr size) {
539  SCOPED_TSAN_INTERCEPTOR(memset, dst, v, size);
540  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
541  return internal_memset(dst, v, size);
542}
543
544TSAN_INTERCEPTOR(void*, memcpy, void *dst, const void *src, uptr size) {
545  SCOPED_TSAN_INTERCEPTOR(memcpy, dst, src, size);
546  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
547  MemoryAccessRange(thr, pc, (uptr)src, size, false);
548  return internal_memcpy(dst, src, size);
549}
550
551TSAN_INTERCEPTOR(int, memcmp, const void *s1, const void *s2, uptr n) {
552  SCOPED_TSAN_INTERCEPTOR(memcmp, s1, s2, n);
553  int res = 0;
554  uptr len = 0;
555  for (; len < n; len++) {
556    if ((res = ((unsigned char*)s1)[len] - ((unsigned char*)s2)[len]))
557      break;
558  }
559  MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
560  MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
561  return res;
562}
563
564TSAN_INTERCEPTOR(int, strcmp, const char *s1, const char *s2) {
565  SCOPED_TSAN_INTERCEPTOR(strcmp, s1, s2);
566  uptr len = 0;
567  for (; s1[len] && s2[len]; len++) {
568    if (s1[len] != s2[len])
569      break;
570  }
571  MemoryAccessRange(thr, pc, (uptr)s1, len + 1, false);
572  MemoryAccessRange(thr, pc, (uptr)s2, len + 1, false);
573  return s1[len] - s2[len];
574}
575
576TSAN_INTERCEPTOR(int, strncmp, const char *s1, const char *s2, uptr n) {
577  SCOPED_TSAN_INTERCEPTOR(strncmp, s1, s2, n);
578  uptr len = 0;
579  for (; len < n && s1[len] && s2[len]; len++) {
580    if (s1[len] != s2[len])
581      break;
582  }
583  MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
584  MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
585  return len == n ? 0 : s1[len] - s2[len];
586}
587
588TSAN_INTERCEPTOR(void*, memchr, void *s, int c, uptr n) {
589  SCOPED_TSAN_INTERCEPTOR(memchr, s, c, n);
590  void *res = REAL(memchr)(s, c, n);
591  uptr len = res ? (char*)res - (char*)s + 1 : n;
592  MemoryAccessRange(thr, pc, (uptr)s, len, false);
593  return res;
594}
595
596TSAN_INTERCEPTOR(void*, memrchr, char *s, int c, uptr n) {
597  SCOPED_TSAN_INTERCEPTOR(memrchr, s, c, n);
598  MemoryAccessRange(thr, pc, (uptr)s, n, false);
599  return REAL(memrchr)(s, c, n);
600}
601
602TSAN_INTERCEPTOR(void*, memmove, void *dst, void *src, uptr n) {
603  SCOPED_TSAN_INTERCEPTOR(memmove, dst, src, n);
604  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
605  MemoryAccessRange(thr, pc, (uptr)src, n, false);
606  return REAL(memmove)(dst, src, n);
607}
608
609TSAN_INTERCEPTOR(char*, strchr, char *s, int c) {
610  SCOPED_TSAN_INTERCEPTOR(strchr, s, c);
611  char *res = REAL(strchr)(s, c);
612  uptr len = res ? (char*)res - (char*)s + 1 : internal_strlen(s) + 1;
613  MemoryAccessRange(thr, pc, (uptr)s, len, false);
614  return res;
615}
616
617TSAN_INTERCEPTOR(char*, strchrnul, char *s, int c) {
618  SCOPED_TSAN_INTERCEPTOR(strchrnul, s, c);
619  char *res = REAL(strchrnul)(s, c);
620  uptr len = (char*)res - (char*)s + 1;
621  MemoryAccessRange(thr, pc, (uptr)s, len, false);
622  return res;
623}
624
625TSAN_INTERCEPTOR(char*, strrchr, char *s, int c) {
626  SCOPED_TSAN_INTERCEPTOR(strrchr, s, c);
627  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s) + 1, false);
628  return REAL(strrchr)(s, c);
629}
630
631TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) {  // NOLINT
632  SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);  // NOLINT
633  uptr srclen = internal_strlen(src);
634  MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
635  MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
636  return REAL(strcpy)(dst, src);  // NOLINT
637}
638
639TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
640  SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
641  uptr srclen = internal_strnlen(src, n);
642  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
643  MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
644  return REAL(strncpy)(dst, src, n);
645}
646
647TSAN_INTERCEPTOR(const char*, strstr, const char *s1, const char *s2) {
648  SCOPED_TSAN_INTERCEPTOR(strstr, s1, s2);
649  const char *res = REAL(strstr)(s1, s2);
650  uptr len1 = internal_strlen(s1);
651  uptr len2 = internal_strlen(s2);
652  MemoryAccessRange(thr, pc, (uptr)s1, len1 + 1, false);
653  MemoryAccessRange(thr, pc, (uptr)s2, len2 + 1, false);
654  return res;
655}
656
657static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
658  if (*addr) {
659    if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
660      if (flags & MAP_FIXED) {
661        errno = EINVAL;
662        return false;
663      } else {
664        *addr = 0;
665      }
666    }
667  }
668  return true;
669}
670
671TSAN_INTERCEPTOR(void*, mmap, void *addr, long_t sz, int prot,
672                         int flags, int fd, unsigned off) {
673  SCOPED_TSAN_INTERCEPTOR(mmap, addr, sz, prot, flags, fd, off);
674  if (!fix_mmap_addr(&addr, sz, flags))
675    return MAP_FAILED;
676  void *res = REAL(mmap)(addr, sz, prot, flags, fd, off);
677  if (res != MAP_FAILED) {
678    if (fd > 0)
679      FdAccess(thr, pc, fd);
680    MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
681  }
682  return res;
683}
684
685TSAN_INTERCEPTOR(void*, mmap64, void *addr, long_t sz, int prot,
686                           int flags, int fd, u64 off) {
687  SCOPED_TSAN_INTERCEPTOR(mmap64, addr, sz, prot, flags, fd, off);
688  if (!fix_mmap_addr(&addr, sz, flags))
689    return MAP_FAILED;
690  void *res = REAL(mmap64)(addr, sz, prot, flags, fd, off);
691  if (res != MAP_FAILED) {
692    if (fd > 0)
693      FdAccess(thr, pc, fd);
694    MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
695  }
696  return res;
697}
698
699TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
700  SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
701  DontNeedShadowFor((uptr)addr, sz);
702  int res = REAL(munmap)(addr, sz);
703  return res;
704}
705
706TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
707  SCOPED_TSAN_INTERCEPTOR(memalign, align, sz);
708  return user_alloc(thr, pc, sz, align);
709}
710
711TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
712  SCOPED_TSAN_INTERCEPTOR(valloc, sz);
713  return user_alloc(thr, pc, sz, GetPageSizeCached());
714}
715
716TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
717  SCOPED_TSAN_INTERCEPTOR(pvalloc, sz);
718  sz = RoundUp(sz, GetPageSizeCached());
719  return user_alloc(thr, pc, sz, GetPageSizeCached());
720}
721
722TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
723  SCOPED_TSAN_INTERCEPTOR(posix_memalign, memptr, align, sz);
724  *memptr = user_alloc(thr, pc, sz, align);
725  return 0;
726}
727
728// Used in thread-safe function static initialization.
729extern "C" int INTERFACE_ATTRIBUTE __cxa_guard_acquire(atomic_uint32_t *g) {
730  SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
731  for (;;) {
732    u32 cmp = atomic_load(g, memory_order_acquire);
733    if (cmp == 0) {
734      if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
735        return 1;
736    } else if (cmp == 1) {
737      Acquire(thr, pc, (uptr)g);
738      return 0;
739    } else {
740      internal_sched_yield();
741    }
742  }
743}
744
745extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_release(atomic_uint32_t *g) {
746  SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
747  Release(thr, pc, (uptr)g);
748  atomic_store(g, 1, memory_order_release);
749}
750
751extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_abort(atomic_uint32_t *g) {
752  SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
753  atomic_store(g, 0, memory_order_relaxed);
754}
755
756static void thread_finalize(void *v) {
757  uptr iter = (uptr)v;
758  if (iter > 1) {
759    if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
760      Printf("ThreadSanitizer: failed to set thread key\n");
761      Die();
762    }
763    return;
764  }
765  {
766    ScopedInRtl in_rtl;
767    ThreadState *thr = cur_thread();
768    ThreadFinish(thr);
769    SignalContext *sctx = thr->signal_ctx;
770    if (sctx) {
771      thr->signal_ctx = 0;
772      UnmapOrDie(sctx, sizeof(*sctx));
773    }
774  }
775}
776
777
778struct ThreadParam {
779  void* (*callback)(void *arg);
780  void *param;
781  atomic_uintptr_t tid;
782};
783
784extern "C" void *__tsan_thread_start_func(void *arg) {
785  ThreadParam *p = (ThreadParam*)arg;
786  void* (*callback)(void *arg) = p->callback;
787  void *param = p->param;
788  int tid = 0;
789  {
790    ThreadState *thr = cur_thread();
791    ScopedInRtl in_rtl;
792    if (pthread_setspecific(g_thread_finalize_key, (void*)4)) {
793      Printf("ThreadSanitizer: failed to set thread key\n");
794      Die();
795    }
796    while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
797      pthread_yield();
798    atomic_store(&p->tid, 0, memory_order_release);
799    ThreadStart(thr, tid, GetTid());
800    CHECK_EQ(thr->in_rtl, 1);
801  }
802  void *res = callback(param);
803  // Prevent the callback from being tail called,
804  // it mixes up stack traces.
805  volatile int foo = 42;
806  foo++;
807  return res;
808}
809
810TSAN_INTERCEPTOR(int, pthread_create,
811    void *th, void *attr, void *(*callback)(void*), void * param) {
812  SCOPED_TSAN_INTERCEPTOR(pthread_create, th, attr, callback, param);
813  __sanitizer_pthread_attr_t myattr;
814  if (attr == 0) {
815    pthread_attr_init(&myattr);
816    attr = &myattr;
817  }
818  int detached = 0;
819  pthread_attr_getdetachstate(attr, &detached);
820
821#if defined(TSAN_DEBUG_OUTPUT)
822  int verbosity = (TSAN_DEBUG_OUTPUT);
823#else
824  int verbosity = 0;
825#endif
826  AdjustStackSizeLinux(attr, verbosity);
827
828  ThreadParam p;
829  p.callback = callback;
830  p.param = param;
831  atomic_store(&p.tid, 0, memory_order_relaxed);
832  int res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
833  if (res == 0) {
834    int tid = ThreadCreate(thr, pc, *(uptr*)th, detached);
835    CHECK_NE(tid, 0);
836    atomic_store(&p.tid, tid, memory_order_release);
837    while (atomic_load(&p.tid, memory_order_acquire) != 0)
838      pthread_yield();
839  }
840  if (attr == &myattr)
841    pthread_attr_destroy(&myattr);
842  return res;
843}
844
845TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
846  SCOPED_TSAN_INTERCEPTOR(pthread_join, th, ret);
847  int tid = ThreadTid(thr, pc, (uptr)th);
848  int res = BLOCK_REAL(pthread_join)(th, ret);
849  if (res == 0) {
850    ThreadJoin(thr, pc, tid);
851  }
852  return res;
853}
854
855TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
856  SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
857  int tid = ThreadTid(thr, pc, (uptr)th);
858  int res = REAL(pthread_detach)(th);
859  if (res == 0) {
860    ThreadDetach(thr, pc, tid);
861  }
862  return res;
863}
864
865TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
866  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
867  int res = REAL(pthread_mutex_init)(m, a);
868  if (res == 0) {
869    bool recursive = false;
870    if (a) {
871      int type = 0;
872      if (pthread_mutexattr_gettype(a, &type) == 0)
873        recursive = (type == PTHREAD_MUTEX_RECURSIVE
874            || type == PTHREAD_MUTEX_RECURSIVE_NP);
875    }
876    MutexCreate(thr, pc, (uptr)m, false, recursive, false);
877  }
878  return res;
879}
880
881TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
882  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
883  int res = REAL(pthread_mutex_destroy)(m);
884  if (res == 0 || res == EBUSY) {
885    MutexDestroy(thr, pc, (uptr)m);
886  }
887  return res;
888}
889
890TSAN_INTERCEPTOR(int, pthread_mutex_lock, void *m) {
891  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_lock, m);
892  int res = REAL(pthread_mutex_lock)(m);
893  if (res == 0) {
894    MutexLock(thr, pc, (uptr)m);
895  }
896  return res;
897}
898
899TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
900  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
901  int res = REAL(pthread_mutex_trylock)(m);
902  if (res == 0) {
903    MutexLock(thr, pc, (uptr)m);
904  }
905  return res;
906}
907
908TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
909  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
910  int res = REAL(pthread_mutex_timedlock)(m, abstime);
911  if (res == 0) {
912    MutexLock(thr, pc, (uptr)m);
913  }
914  return res;
915}
916
917TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {
918  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_unlock, m);
919  MutexUnlock(thr, pc, (uptr)m);
920  int res = REAL(pthread_mutex_unlock)(m);
921  return res;
922}
923
924TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
925  SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
926  int res = REAL(pthread_spin_init)(m, pshared);
927  if (res == 0) {
928    MutexCreate(thr, pc, (uptr)m, false, false, false);
929  }
930  return res;
931}
932
933TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
934  SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
935  int res = REAL(pthread_spin_destroy)(m);
936  if (res == 0) {
937    MutexDestroy(thr, pc, (uptr)m);
938  }
939  return res;
940}
941
942TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
943  SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
944  int res = REAL(pthread_spin_lock)(m);
945  if (res == 0) {
946    MutexLock(thr, pc, (uptr)m);
947  }
948  return res;
949}
950
951TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
952  SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
953  int res = REAL(pthread_spin_trylock)(m);
954  if (res == 0) {
955    MutexLock(thr, pc, (uptr)m);
956  }
957  return res;
958}
959
960TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
961  SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
962  MutexUnlock(thr, pc, (uptr)m);
963  int res = REAL(pthread_spin_unlock)(m);
964  return res;
965}
966
967TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
968  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
969  int res = REAL(pthread_rwlock_init)(m, a);
970  if (res == 0) {
971    MutexCreate(thr, pc, (uptr)m, true, false, false);
972  }
973  return res;
974}
975
976TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
977  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
978  int res = REAL(pthread_rwlock_destroy)(m);
979  if (res == 0) {
980    MutexDestroy(thr, pc, (uptr)m);
981  }
982  return res;
983}
984
985TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
986  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
987  int res = REAL(pthread_rwlock_rdlock)(m);
988  if (res == 0) {
989    MutexReadLock(thr, pc, (uptr)m);
990  }
991  return res;
992}
993
994TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
995  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
996  int res = REAL(pthread_rwlock_tryrdlock)(m);
997  if (res == 0) {
998    MutexReadLock(thr, pc, (uptr)m);
999  }
1000  return res;
1001}
1002
1003TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
1004  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
1005  int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
1006  if (res == 0) {
1007    MutexReadLock(thr, pc, (uptr)m);
1008  }
1009  return res;
1010}
1011
1012TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
1013  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
1014  int res = REAL(pthread_rwlock_wrlock)(m);
1015  if (res == 0) {
1016    MutexLock(thr, pc, (uptr)m);
1017  }
1018  return res;
1019}
1020
1021TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
1022  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
1023  int res = REAL(pthread_rwlock_trywrlock)(m);
1024  if (res == 0) {
1025    MutexLock(thr, pc, (uptr)m);
1026  }
1027  return res;
1028}
1029
1030TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
1031  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
1032  int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
1033  if (res == 0) {
1034    MutexLock(thr, pc, (uptr)m);
1035  }
1036  return res;
1037}
1038
1039TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
1040  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
1041  MutexReadOrWriteUnlock(thr, pc, (uptr)m);
1042  int res = REAL(pthread_rwlock_unlock)(m);
1043  return res;
1044}
1045
1046// libpthread.so contains several versions of pthread_cond_init symbol.
1047// When we just dlsym() it, we get the wrong (old) version.
1048/*
1049TSAN_INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
1050  SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, c, a);
1051  int res = REAL(pthread_cond_init)(c, a);
1052  return res;
1053}
1054*/
1055
1056TSAN_INTERCEPTOR(int, pthread_cond_destroy, void *c) {
1057  SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, c);
1058  int res = REAL(pthread_cond_destroy)(c);
1059  return res;
1060}
1061
1062TSAN_INTERCEPTOR(int, pthread_cond_signal, void *c) {
1063  SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, c);
1064  int res = REAL(pthread_cond_signal)(c);
1065  return res;
1066}
1067
1068TSAN_INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
1069  SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, c);
1070  int res = REAL(pthread_cond_broadcast)(c);
1071  return res;
1072}
1073
1074TSAN_INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
1075  SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, c, m);
1076  MutexUnlock(thr, pc, (uptr)m);
1077  int res = REAL(pthread_cond_wait)(c, m);
1078  MutexLock(thr, pc, (uptr)m);
1079  return res;
1080}
1081
1082TSAN_INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m, void *abstime) {
1083  SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, c, m, abstime);
1084  MutexUnlock(thr, pc, (uptr)m);
1085  int res = REAL(pthread_cond_timedwait)(c, m, abstime);
1086  MutexLock(thr, pc, (uptr)m);
1087  return res;
1088}
1089
1090TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1091  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1092  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1093  int res = REAL(pthread_barrier_init)(b, a, count);
1094  return res;
1095}
1096
1097TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1098  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1099  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1100  int res = REAL(pthread_barrier_destroy)(b);
1101  return res;
1102}
1103
1104TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1105  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1106  Release(thr, pc, (uptr)b);
1107  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1108  int res = REAL(pthread_barrier_wait)(b);
1109  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1110  if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1111    Acquire(thr, pc, (uptr)b);
1112  }
1113  return res;
1114}
1115
1116TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1117  SCOPED_TSAN_INTERCEPTOR(pthread_once, o, f);
1118  if (o == 0 || f == 0)
1119    return EINVAL;
1120  atomic_uint32_t *a = static_cast<atomic_uint32_t*>(o);
1121  u32 v = atomic_load(a, memory_order_acquire);
1122  if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1123                                               memory_order_relaxed)) {
1124    const int old_in_rtl = thr->in_rtl;
1125    thr->in_rtl = 0;
1126    (*f)();
1127    CHECK_EQ(thr->in_rtl, 0);
1128    thr->in_rtl = old_in_rtl;
1129    Release(thr, pc, (uptr)o);
1130    atomic_store(a, 2, memory_order_release);
1131  } else {
1132    while (v != 2) {
1133      pthread_yield();
1134      v = atomic_load(a, memory_order_acquire);
1135    }
1136    Acquire(thr, pc, (uptr)o);
1137  }
1138  return 0;
1139}
1140
1141TSAN_INTERCEPTOR(int, sem_init, void *s, int pshared, unsigned value) {
1142  SCOPED_TSAN_INTERCEPTOR(sem_init, s, pshared, value);
1143  int res = REAL(sem_init)(s, pshared, value);
1144  return res;
1145}
1146
1147TSAN_INTERCEPTOR(int, sem_destroy, void *s) {
1148  SCOPED_TSAN_INTERCEPTOR(sem_destroy, s);
1149  int res = REAL(sem_destroy)(s);
1150  return res;
1151}
1152
1153TSAN_INTERCEPTOR(int, sem_wait, void *s) {
1154  SCOPED_TSAN_INTERCEPTOR(sem_wait, s);
1155  int res = BLOCK_REAL(sem_wait)(s);
1156  if (res == 0) {
1157    Acquire(thr, pc, (uptr)s);
1158  }
1159  return res;
1160}
1161
1162TSAN_INTERCEPTOR(int, sem_trywait, void *s) {
1163  SCOPED_TSAN_INTERCEPTOR(sem_trywait, s);
1164  int res = BLOCK_REAL(sem_trywait)(s);
1165  if (res == 0) {
1166    Acquire(thr, pc, (uptr)s);
1167  }
1168  return res;
1169}
1170
1171TSAN_INTERCEPTOR(int, sem_timedwait, void *s, void *abstime) {
1172  SCOPED_TSAN_INTERCEPTOR(sem_timedwait, s, abstime);
1173  int res = BLOCK_REAL(sem_timedwait)(s, abstime);
1174  if (res == 0) {
1175    Acquire(thr, pc, (uptr)s);
1176  }
1177  return res;
1178}
1179
1180TSAN_INTERCEPTOR(int, sem_post, void *s) {
1181  SCOPED_TSAN_INTERCEPTOR(sem_post, s);
1182  Release(thr, pc, (uptr)s);
1183  int res = REAL(sem_post)(s);
1184  return res;
1185}
1186
1187TSAN_INTERCEPTOR(int, sem_getvalue, void *s, int *sval) {
1188  SCOPED_TSAN_INTERCEPTOR(sem_getvalue, s, sval);
1189  int res = REAL(sem_getvalue)(s, sval);
1190  if (res == 0) {
1191    Acquire(thr, pc, (uptr)s);
1192  }
1193  return res;
1194}
1195
1196TSAN_INTERCEPTOR(int, __xstat, int version, const char *path, void *buf) {
1197  SCOPED_TSAN_INTERCEPTOR(__xstat, version, path, buf);
1198  return REAL(__xstat)(version, path, buf);
1199}
1200
1201TSAN_INTERCEPTOR(int, stat, const char *path, void *buf) {
1202  SCOPED_TSAN_INTERCEPTOR(__xstat, 0, path, buf);
1203  return REAL(__xstat)(0, path, buf);
1204}
1205
1206TSAN_INTERCEPTOR(int, __xstat64, int version, const char *path, void *buf) {
1207  SCOPED_TSAN_INTERCEPTOR(__xstat64, version, path, buf);
1208  return REAL(__xstat64)(version, path, buf);
1209}
1210
1211TSAN_INTERCEPTOR(int, stat64, const char *path, void *buf) {
1212  SCOPED_TSAN_INTERCEPTOR(__xstat64, 0, path, buf);
1213  return REAL(__xstat64)(0, path, buf);
1214}
1215
1216TSAN_INTERCEPTOR(int, __lxstat, int version, const char *path, void *buf) {
1217  SCOPED_TSAN_INTERCEPTOR(__lxstat, version, path, buf);
1218  return REAL(__lxstat)(version, path, buf);
1219}
1220
1221TSAN_INTERCEPTOR(int, lstat, const char *path, void *buf) {
1222  SCOPED_TSAN_INTERCEPTOR(__lxstat, 0, path, buf);
1223  return REAL(__lxstat)(0, path, buf);
1224}
1225
1226TSAN_INTERCEPTOR(int, __lxstat64, int version, const char *path, void *buf) {
1227  SCOPED_TSAN_INTERCEPTOR(__lxstat64, version, path, buf);
1228  return REAL(__lxstat64)(version, path, buf);
1229}
1230
1231TSAN_INTERCEPTOR(int, lstat64, const char *path, void *buf) {
1232  SCOPED_TSAN_INTERCEPTOR(__lxstat64, 0, path, buf);
1233  return REAL(__lxstat64)(0, path, buf);
1234}
1235
1236TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1237  SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1238  if (fd > 0)
1239    FdAccess(thr, pc, fd);
1240  return REAL(__fxstat)(version, fd, buf);
1241}
1242
1243TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1244  SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
1245  if (fd > 0)
1246    FdAccess(thr, pc, fd);
1247  return REAL(__fxstat)(0, fd, buf);
1248}
1249
1250TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1251  SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1252  if (fd > 0)
1253    FdAccess(thr, pc, fd);
1254  return REAL(__fxstat64)(version, fd, buf);
1255}
1256
1257TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1258  SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
1259  if (fd > 0)
1260    FdAccess(thr, pc, fd);
1261  return REAL(__fxstat64)(0, fd, buf);
1262}
1263
1264TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1265  SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1266  int fd = REAL(open)(name, flags, mode);
1267  if (fd >= 0)
1268    FdFileCreate(thr, pc, fd);
1269  return fd;
1270}
1271
1272TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
1273  SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
1274  int fd = REAL(open64)(name, flags, mode);
1275  if (fd >= 0)
1276    FdFileCreate(thr, pc, fd);
1277  return fd;
1278}
1279
1280TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1281  SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1282  int fd = REAL(creat)(name, mode);
1283  if (fd >= 0)
1284    FdFileCreate(thr, pc, fd);
1285  return fd;
1286}
1287
1288TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1289  SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1290  int fd = REAL(creat64)(name, mode);
1291  if (fd >= 0)
1292    FdFileCreate(thr, pc, fd);
1293  return fd;
1294}
1295
1296TSAN_INTERCEPTOR(int, dup, int oldfd) {
1297  SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1298  int newfd = REAL(dup)(oldfd);
1299  if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1300    FdDup(thr, pc, oldfd, newfd);
1301  return newfd;
1302}
1303
1304TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1305  SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1306  int newfd2 = REAL(dup2)(oldfd, newfd);
1307  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1308    FdDup(thr, pc, oldfd, newfd2);
1309  return newfd2;
1310}
1311
1312TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1313  SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1314  int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1315  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1316    FdDup(thr, pc, oldfd, newfd2);
1317  return newfd2;
1318}
1319
1320TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1321  SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1322  int fd = REAL(eventfd)(initval, flags);
1323  if (fd >= 0)
1324    FdEventCreate(thr, pc, fd);
1325  return fd;
1326}
1327
1328TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1329  SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1330  if (fd >= 0)
1331    FdClose(thr, pc, fd);
1332  fd = REAL(signalfd)(fd, mask, flags);
1333  if (fd >= 0)
1334    FdSignalCreate(thr, pc, fd);
1335  return fd;
1336}
1337
1338TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1339  SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1340  int fd = REAL(inotify_init)(fake);
1341  if (fd >= 0)
1342    FdInotifyCreate(thr, pc, fd);
1343  return fd;
1344}
1345
1346TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1347  SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1348  int fd = REAL(inotify_init1)(flags);
1349  if (fd >= 0)
1350    FdInotifyCreate(thr, pc, fd);
1351  return fd;
1352}
1353
1354TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1355  SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1356  int fd = REAL(socket)(domain, type, protocol);
1357  if (fd >= 0)
1358    FdSocketCreate(thr, pc, fd);
1359  return fd;
1360}
1361
1362TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1363  SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1364  int res = REAL(socketpair)(domain, type, protocol, fd);
1365  if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1366    FdPipeCreate(thr, pc, fd[0], fd[1]);
1367  return res;
1368}
1369
1370TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1371  SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1372  FdSocketConnecting(thr, pc, fd);
1373  int res = REAL(connect)(fd, addr, addrlen);
1374  if (res == 0 && fd >= 0)
1375    FdSocketConnect(thr, pc, fd);
1376  return res;
1377}
1378
1379TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
1380  SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
1381  int res = REAL(bind)(fd, addr, addrlen);
1382  if (fd > 0 && res == 0)
1383    FdAccess(thr, pc, fd);
1384  return res;
1385}
1386
1387TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
1388  SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
1389  int res = REAL(listen)(fd, backlog);
1390  if (fd > 0 && res == 0)
1391    FdAccess(thr, pc, fd);
1392  return res;
1393}
1394
1395TSAN_INTERCEPTOR(int, epoll_create, int size) {
1396  SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1397  int fd = REAL(epoll_create)(size);
1398  if (fd >= 0)
1399    FdPollCreate(thr, pc, fd);
1400  return fd;
1401}
1402
1403TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1404  SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1405  int fd = REAL(epoll_create1)(flags);
1406  if (fd >= 0)
1407    FdPollCreate(thr, pc, fd);
1408  return fd;
1409}
1410
1411TSAN_INTERCEPTOR(int, close, int fd) {
1412  SCOPED_TSAN_INTERCEPTOR(close, fd);
1413  if (fd >= 0)
1414    FdClose(thr, pc, fd);
1415  return REAL(close)(fd);
1416}
1417
1418TSAN_INTERCEPTOR(int, __close, int fd) {
1419  SCOPED_TSAN_INTERCEPTOR(__close, fd);
1420  if (fd >= 0)
1421    FdClose(thr, pc, fd);
1422  return REAL(__close)(fd);
1423}
1424
1425// glibc guts
1426TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
1427  SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
1428  int fds[64];
1429  int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
1430  for (int i = 0; i < cnt; i++) {
1431    if (fds[i] > 0)
1432      FdClose(thr, pc, fds[i]);
1433  }
1434  REAL(__res_iclose)(state, free_addr);
1435}
1436
1437TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1438  SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1439  int res = REAL(pipe)(pipefd);
1440  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1441    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1442  return res;
1443}
1444
1445TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1446  SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1447  int res = REAL(pipe2)(pipefd, flags);
1448  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1449    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1450  return res;
1451}
1452
1453TSAN_INTERCEPTOR(long_t, readv, int fd, void *vec, int cnt) {
1454  SCOPED_TSAN_INTERCEPTOR(readv, fd, vec, cnt);
1455  int res = REAL(readv)(fd, vec, cnt);
1456  if (res >= 0 && fd >= 0) {
1457    FdAcquire(thr, pc, fd);
1458  }
1459  return res;
1460}
1461
1462TSAN_INTERCEPTOR(long_t, preadv64, int fd, void *vec, int cnt, u64 off) {
1463  SCOPED_TSAN_INTERCEPTOR(preadv64, fd, vec, cnt, off);
1464  int res = REAL(preadv64)(fd, vec, cnt, off);
1465  if (res >= 0 && fd >= 0) {
1466    FdAcquire(thr, pc, fd);
1467  }
1468  return res;
1469}
1470
1471TSAN_INTERCEPTOR(long_t, writev, int fd, void *vec, int cnt) {
1472  SCOPED_TSAN_INTERCEPTOR(writev, fd, vec, cnt);
1473  if (fd >= 0)
1474    FdRelease(thr, pc, fd);
1475  int res = REAL(writev)(fd, vec, cnt);
1476  return res;
1477}
1478
1479TSAN_INTERCEPTOR(long_t, pwritev64, int fd, void *vec, int cnt, u64 off) {
1480  SCOPED_TSAN_INTERCEPTOR(pwritev64, fd, vec, cnt, off);
1481  if (fd >= 0)
1482    FdRelease(thr, pc, fd);
1483  int res = REAL(pwritev64)(fd, vec, cnt, off);
1484  return res;
1485}
1486
1487TSAN_INTERCEPTOR(long_t, send, int fd, void *buf, long_t len, int flags) {
1488  SCOPED_TSAN_INTERCEPTOR(send, fd, buf, len, flags);
1489  if (fd >= 0)
1490    FdRelease(thr, pc, fd);
1491  int res = REAL(send)(fd, buf, len, flags);
1492  return res;
1493}
1494
1495TSAN_INTERCEPTOR(long_t, sendmsg, int fd, void *msg, int flags) {
1496  SCOPED_TSAN_INTERCEPTOR(sendmsg, fd, msg, flags);
1497  if (fd >= 0)
1498    FdRelease(thr, pc, fd);
1499  int res = REAL(sendmsg)(fd, msg, flags);
1500  return res;
1501}
1502
1503TSAN_INTERCEPTOR(long_t, recv, int fd, void *buf, long_t len, int flags) {
1504  SCOPED_TSAN_INTERCEPTOR(recv, fd, buf, len, flags);
1505  int res = REAL(recv)(fd, buf, len, flags);
1506  if (res >= 0 && fd >= 0) {
1507    FdAcquire(thr, pc, fd);
1508  }
1509  return res;
1510}
1511
1512TSAN_INTERCEPTOR(int, unlink, char *path) {
1513  SCOPED_TSAN_INTERCEPTOR(unlink, path);
1514  Release(thr, pc, File2addr(path));
1515  int res = REAL(unlink)(path);
1516  return res;
1517}
1518
1519TSAN_INTERCEPTOR(void*, fopen, char *path, char *mode) {
1520  SCOPED_TSAN_INTERCEPTOR(fopen, path, mode);
1521  void *res = REAL(fopen)(path, mode);
1522  Acquire(thr, pc, File2addr(path));
1523  if (res) {
1524    int fd = fileno_unlocked(res);
1525    if (fd >= 0)
1526      FdFileCreate(thr, pc, fd);
1527  }
1528  return res;
1529}
1530
1531TSAN_INTERCEPTOR(void*, freopen, char *path, char *mode, void *stream) {
1532  SCOPED_TSAN_INTERCEPTOR(freopen, path, mode, stream);
1533  if (stream) {
1534    int fd = fileno_unlocked(stream);
1535    if (fd >= 0)
1536      FdClose(thr, pc, fd);
1537  }
1538  void *res = REAL(freopen)(path, mode, stream);
1539  Acquire(thr, pc, File2addr(path));
1540  if (res) {
1541    int fd = fileno_unlocked(res);
1542    if (fd >= 0)
1543      FdFileCreate(thr, pc, fd);
1544  }
1545  return res;
1546}
1547
1548TSAN_INTERCEPTOR(int, fclose, void *stream) {
1549  {
1550    SCOPED_TSAN_INTERCEPTOR(fclose, stream);
1551    if (stream) {
1552      int fd = fileno_unlocked(stream);
1553      if (fd >= 0)
1554        FdClose(thr, pc, fd);
1555    }
1556  }
1557  return REAL(fclose)(stream);
1558}
1559
1560TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1561  {
1562    SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1563    MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1564  }
1565  return REAL(fread)(ptr, size, nmemb, f);
1566}
1567
1568TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1569  {
1570    SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1571    MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1572  }
1573  return REAL(fwrite)(p, size, nmemb, f);
1574}
1575
1576TSAN_INTERCEPTOR(int, fflush, void *stream) {
1577  SCOPED_TSAN_INTERCEPTOR(fflush, stream);
1578  return REAL(fflush)(stream);
1579}
1580
1581TSAN_INTERCEPTOR(void, abort, int fake) {
1582  SCOPED_TSAN_INTERCEPTOR(abort, fake);
1583  REAL(fflush)(0);
1584  REAL(abort)(fake);
1585}
1586
1587TSAN_INTERCEPTOR(int, puts, const char *s) {
1588  SCOPED_TSAN_INTERCEPTOR(puts, s);
1589  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1590  return REAL(puts)(s);
1591}
1592
1593TSAN_INTERCEPTOR(int, rmdir, char *path) {
1594  SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1595  Release(thr, pc, Dir2addr(path));
1596  int res = REAL(rmdir)(path);
1597  return res;
1598}
1599
1600TSAN_INTERCEPTOR(void*, opendir, char *path) {
1601  SCOPED_TSAN_INTERCEPTOR(opendir, path);
1602  void *res = REAL(opendir)(path);
1603  if (res != 0)
1604    Acquire(thr, pc, Dir2addr(path));
1605  return res;
1606}
1607
1608TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1609  SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1610  if (op == EPOLL_CTL_ADD && epfd >= 0) {
1611    FdRelease(thr, pc, epfd);
1612  }
1613  int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1614  if (fd >= 0)
1615    FdAccess(thr, pc, fd);
1616  return res;
1617}
1618
1619TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1620  SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1621  int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1622  if (res > 0 && epfd >= 0) {
1623    FdAcquire(thr, pc, epfd);
1624  }
1625  return res;
1626}
1627
1628TSAN_INTERCEPTOR(int, poll, void *fds, long_t nfds, int timeout) {
1629  SCOPED_TSAN_INTERCEPTOR(poll, fds, nfds, timeout);
1630  int res = BLOCK_REAL(poll)(fds, nfds, timeout);
1631  return res;
1632}
1633
1634void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1635    my_siginfo_t *info, void *ctx) {
1636  ThreadState *thr = cur_thread();
1637  SignalContext *sctx = SigCtx(thr);
1638  // Don't mess with synchronous signals.
1639  if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1640      sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE ||
1641      // If we are sending signal to ourselves, we must process it now.
1642      (sctx && sig == sctx->int_signal_send) ||
1643      // If we are in blocking function, we can safely process it now
1644      // (but check if we are in a recursive interceptor,
1645      // i.e. pthread_join()->munmap()).
1646      (sctx && sctx->in_blocking_func == 1 && thr->in_rtl == 1)) {
1647    int in_rtl = thr->in_rtl;
1648    thr->in_rtl = 0;
1649    CHECK_EQ(thr->in_signal_handler, false);
1650    thr->in_signal_handler = true;
1651    if (sigact)
1652      sigactions[sig].sa_sigaction(sig, info, ctx);
1653    else
1654      sigactions[sig].sa_handler(sig);
1655    CHECK_EQ(thr->in_signal_handler, true);
1656    thr->in_signal_handler = false;
1657    thr->in_rtl = in_rtl;
1658    return;
1659  }
1660
1661  if (sctx == 0)
1662    return;
1663  SignalDesc *signal = &sctx->pending_signals[sig];
1664  if (signal->armed == false) {
1665    signal->armed = true;
1666    signal->sigaction = sigact;
1667    if (info)
1668      internal_memcpy(&signal->siginfo, info, sizeof(*info));
1669    if (ctx)
1670      internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1671    sctx->pending_signal_count++;
1672  }
1673}
1674
1675static void rtl_sighandler(int sig) {
1676  rtl_generic_sighandler(false, sig, 0, 0);
1677}
1678
1679static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1680  rtl_generic_sighandler(true, sig, info, ctx);
1681}
1682
1683TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1684  SCOPED_TSAN_INTERCEPTOR(sigaction, sig, act, old);
1685  if (old)
1686    internal_memcpy(old, &sigactions[sig], sizeof(*old));
1687  if (act == 0)
1688    return 0;
1689  internal_memcpy(&sigactions[sig], act, sizeof(*act));
1690  sigaction_t newact;
1691  internal_memcpy(&newact, act, sizeof(newact));
1692  sigfillset(&newact.sa_mask);
1693  if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1694    if (newact.sa_flags & SA_SIGINFO)
1695      newact.sa_sigaction = rtl_sigaction;
1696    else
1697      newact.sa_handler = rtl_sighandler;
1698  }
1699  int res = REAL(sigaction)(sig, &newact, 0);
1700  return res;
1701}
1702
1703TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1704  sigaction_t act;
1705  act.sa_handler = h;
1706  REAL(memset)(&act.sa_mask, -1, sizeof(act.sa_mask));
1707  act.sa_flags = 0;
1708  sigaction_t old;
1709  int res = sigaction(sig, &act, &old);
1710  if (res)
1711    return SIG_ERR;
1712  return old.sa_handler;
1713}
1714
1715TSAN_INTERCEPTOR(int, raise, int sig) {
1716  SCOPED_TSAN_INTERCEPTOR(raise, sig);
1717  SignalContext *sctx = SigCtx(thr);
1718  CHECK_NE(sctx, 0);
1719  int prev = sctx->int_signal_send;
1720  sctx->int_signal_send = sig;
1721  int res = REAL(raise)(sig);
1722  CHECK_EQ(sctx->int_signal_send, sig);
1723  sctx->int_signal_send = prev;
1724  return res;
1725}
1726
1727TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1728  SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1729  SignalContext *sctx = SigCtx(thr);
1730  CHECK_NE(sctx, 0);
1731  int prev = sctx->int_signal_send;
1732  if (pid == (int)internal_getpid()) {
1733    sctx->int_signal_send = sig;
1734  }
1735  int res = REAL(kill)(pid, sig);
1736  if (pid == (int)internal_getpid()) {
1737    CHECK_EQ(sctx->int_signal_send, sig);
1738    sctx->int_signal_send = prev;
1739  }
1740  return res;
1741}
1742
1743TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1744  SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1745  SignalContext *sctx = SigCtx(thr);
1746  CHECK_NE(sctx, 0);
1747  int prev = sctx->int_signal_send;
1748  if (tid == pthread_self()) {
1749    sctx->int_signal_send = sig;
1750  }
1751  int res = REAL(pthread_kill)(tid, sig);
1752  if (tid == pthread_self()) {
1753    CHECK_EQ(sctx->int_signal_send, sig);
1754    sctx->int_signal_send = prev;
1755  }
1756  return res;
1757}
1758
1759TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
1760  SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
1761  // It's intercepted merely to process pending signals.
1762  return REAL(gettimeofday)(tv, tz);
1763}
1764
1765// Linux kernel has a bug that leads to kernel deadlock if a process
1766// maps TBs of memory and then calls mlock().
1767static void MlockIsUnsupported() {
1768  static atomic_uint8_t printed;
1769  if (atomic_exchange(&printed, 1, memory_order_relaxed))
1770    return;
1771  Printf("INFO: ThreadSanitizer ignores mlock/mlockall/munlock/munlockall\n");
1772}
1773
1774TSAN_INTERCEPTOR(int, mlock, const void *addr, uptr len) {
1775  MlockIsUnsupported();
1776  return 0;
1777}
1778
1779TSAN_INTERCEPTOR(int, munlock, const void *addr, uptr len) {
1780  MlockIsUnsupported();
1781  return 0;
1782}
1783
1784TSAN_INTERCEPTOR(int, mlockall, int flags) {
1785  MlockIsUnsupported();
1786  return 0;
1787}
1788
1789TSAN_INTERCEPTOR(int, munlockall, void) {
1790  MlockIsUnsupported();
1791  return 0;
1792}
1793
1794TSAN_INTERCEPTOR(int, fork, int fake) {
1795  SCOPED_TSAN_INTERCEPTOR(fork, fake);
1796  // It's intercepted merely to process pending signals.
1797  int pid = REAL(fork)(fake);
1798  if (pid == 0) {
1799    // child
1800    FdOnFork(thr, pc);
1801  } else if (pid > 0) {
1802    // parent
1803  }
1804  return pid;
1805}
1806
1807struct TsanInterceptorContext {
1808  ThreadState *thr;
1809  const uptr caller_pc;
1810  const uptr pc;
1811};
1812
1813#include "sanitizer_common/sanitizer_platform_interceptors.h"
1814// Causes interceptor recursion (getpwuid_r() calls fopen())
1815#undef SANITIZER_INTERCEPT_GETPWNAM_AND_FRIENDS
1816#undef SANITIZER_INTERCEPT_GETPWNAM_R_AND_FRIENDS
1817// Causes interceptor recursion (getaddrinfo() and fopen())
1818#undef SANITIZER_INTERCEPT_GETADDRINFO
1819// Causes interceptor recursion (glob64() calls lstat64())
1820#undef SANITIZER_INTERCEPT_GLOB
1821
1822#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size)                      \
1823  MemoryAccessRange(((TsanInterceptorContext *) ctx)->thr,                  \
1824                    ((TsanInterceptorContext *) ctx)->pc, (uptr) ptr, size, \
1825                    true)
1826#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size)                       \
1827  MemoryAccessRange(((TsanInterceptorContext *) ctx)->thr,                  \
1828                    ((TsanInterceptorContext *) ctx)->pc, (uptr) ptr, size, \
1829                    false)
1830#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...)      \
1831  SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__);         \
1832  TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
1833  ctx = (void *)&_ctx;                                \
1834  (void) ctx;
1835#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1836  FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1837#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1838  FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1839#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
1840  FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)
1841#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1842  ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)
1843#include "sanitizer_common/sanitizer_common_interceptors.inc"
1844
1845// FIXME: Implement these with MemoryAccessRange().
1846#define COMMON_SYSCALL_PRE_READ_RANGE(p, s)
1847#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s)
1848#define COMMON_SYSCALL_POST_READ_RANGE(p, s)
1849#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s)
1850#include "sanitizer_common/sanitizer_common_syscalls.inc"
1851
1852namespace __tsan {
1853
1854void ProcessPendingSignals(ThreadState *thr) {
1855  CHECK_EQ(thr->in_rtl, 0);
1856  SignalContext *sctx = SigCtx(thr);
1857  if (sctx == 0 || sctx->pending_signal_count == 0 || thr->in_signal_handler)
1858    return;
1859  Context *ctx = CTX();
1860  thr->in_signal_handler = true;
1861  sctx->pending_signal_count = 0;
1862  // These are too big for stack.
1863  static THREADLOCAL sigset_t emptyset, oldset;
1864  sigfillset(&emptyset);
1865  pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
1866  for (int sig = 0; sig < kSigCount; sig++) {
1867    SignalDesc *signal = &sctx->pending_signals[sig];
1868    if (signal->armed) {
1869      signal->armed = false;
1870      if (sigactions[sig].sa_handler != SIG_DFL
1871          && sigactions[sig].sa_handler != SIG_IGN) {
1872        // Insure that the handler does not spoil errno.
1873        const int saved_errno = errno;
1874        errno = 0;
1875        if (signal->sigaction)
1876          sigactions[sig].sa_sigaction(sig, &signal->siginfo, &signal->ctx);
1877        else
1878          sigactions[sig].sa_handler(sig);
1879        if (flags()->report_bugs && errno != 0) {
1880          ScopedInRtl in_rtl;
1881          __tsan::StackTrace stack;
1882          uptr pc = signal->sigaction ?
1883              (uptr)sigactions[sig].sa_sigaction :
1884              (uptr)sigactions[sig].sa_handler;
1885          stack.Init(&pc, 1);
1886          ThreadRegistryLock l(ctx->thread_registry);
1887          ScopedReport rep(ReportTypeErrnoInSignal);
1888          if (!IsFiredSuppression(ctx, rep, stack)) {
1889            rep.AddStack(&stack);
1890            OutputReport(ctx, rep, rep.GetReport()->stacks[0]);
1891          }
1892        }
1893        errno = saved_errno;
1894      }
1895    }
1896  }
1897  pthread_sigmask(SIG_SETMASK, &oldset, 0);
1898  CHECK_EQ(thr->in_signal_handler, true);
1899  thr->in_signal_handler = false;
1900}
1901
1902static void finalize(void *arg) {
1903  ThreadState * thr = cur_thread();
1904  uptr pc = 0;
1905  atexit_ctx->exit(thr, pc);
1906  int status = Finalize(cur_thread());
1907  REAL(fflush)(0);
1908  if (status)
1909    _exit(status);
1910}
1911
1912static void unreachable() {
1913  Printf("FATAL: ThreadSanitizer: unreachable called\n");
1914  Die();
1915}
1916
1917void InitializeInterceptors() {
1918  CHECK_GT(cur_thread()->in_rtl, 0);
1919
1920  // We need to setup it early, because functions like dlsym() can call it.
1921  REAL(memset) = internal_memset;
1922  REAL(memcpy) = internal_memcpy;
1923  REAL(memcmp) = internal_memcmp;
1924
1925  // Instruct libc malloc to consume less memory.
1926  mallopt(1, 0);  // M_MXFAST
1927  mallopt(-3, 32*1024);  // M_MMAP_THRESHOLD
1928
1929  SANITIZER_COMMON_INTERCEPTORS_INIT;
1930
1931  TSAN_INTERCEPT(setjmp);
1932  TSAN_INTERCEPT(_setjmp);
1933  TSAN_INTERCEPT(sigsetjmp);
1934  TSAN_INTERCEPT(__sigsetjmp);
1935  TSAN_INTERCEPT(longjmp);
1936  TSAN_INTERCEPT(siglongjmp);
1937
1938  TSAN_INTERCEPT(malloc);
1939  TSAN_INTERCEPT(__libc_memalign);
1940  TSAN_INTERCEPT(calloc);
1941  TSAN_INTERCEPT(realloc);
1942  TSAN_INTERCEPT(free);
1943  TSAN_INTERCEPT(cfree);
1944  TSAN_INTERCEPT(mmap);
1945  TSAN_INTERCEPT(mmap64);
1946  TSAN_INTERCEPT(munmap);
1947  TSAN_INTERCEPT(memalign);
1948  TSAN_INTERCEPT(valloc);
1949  TSAN_INTERCEPT(pvalloc);
1950  TSAN_INTERCEPT(posix_memalign);
1951
1952  TSAN_INTERCEPT(strlen);
1953  TSAN_INTERCEPT(memset);
1954  TSAN_INTERCEPT(memcpy);
1955  TSAN_INTERCEPT(strcmp);
1956  TSAN_INTERCEPT(memchr);
1957  TSAN_INTERCEPT(memrchr);
1958  TSAN_INTERCEPT(memmove);
1959  TSAN_INTERCEPT(memcmp);
1960  TSAN_INTERCEPT(strchr);
1961  TSAN_INTERCEPT(strchrnul);
1962  TSAN_INTERCEPT(strrchr);
1963  TSAN_INTERCEPT(strncmp);
1964  TSAN_INTERCEPT(strcpy);  // NOLINT
1965  TSAN_INTERCEPT(strncpy);
1966  TSAN_INTERCEPT(strstr);
1967
1968  TSAN_INTERCEPT(pthread_create);
1969  TSAN_INTERCEPT(pthread_join);
1970  TSAN_INTERCEPT(pthread_detach);
1971
1972  TSAN_INTERCEPT(pthread_mutex_init);
1973  TSAN_INTERCEPT(pthread_mutex_destroy);
1974  TSAN_INTERCEPT(pthread_mutex_lock);
1975  TSAN_INTERCEPT(pthread_mutex_trylock);
1976  TSAN_INTERCEPT(pthread_mutex_timedlock);
1977  TSAN_INTERCEPT(pthread_mutex_unlock);
1978
1979  TSAN_INTERCEPT(pthread_spin_init);
1980  TSAN_INTERCEPT(pthread_spin_destroy);
1981  TSAN_INTERCEPT(pthread_spin_lock);
1982  TSAN_INTERCEPT(pthread_spin_trylock);
1983  TSAN_INTERCEPT(pthread_spin_unlock);
1984
1985  TSAN_INTERCEPT(pthread_rwlock_init);
1986  TSAN_INTERCEPT(pthread_rwlock_destroy);
1987  TSAN_INTERCEPT(pthread_rwlock_rdlock);
1988  TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
1989  TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
1990  TSAN_INTERCEPT(pthread_rwlock_wrlock);
1991  TSAN_INTERCEPT(pthread_rwlock_trywrlock);
1992  TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
1993  TSAN_INTERCEPT(pthread_rwlock_unlock);
1994
1995  // TSAN_INTERCEPT(pthread_cond_init);
1996  TSAN_INTERCEPT(pthread_cond_destroy);
1997  TSAN_INTERCEPT(pthread_cond_signal);
1998  TSAN_INTERCEPT(pthread_cond_broadcast);
1999  TSAN_INTERCEPT(pthread_cond_wait);
2000  TSAN_INTERCEPT(pthread_cond_timedwait);
2001
2002  TSAN_INTERCEPT(pthread_barrier_init);
2003  TSAN_INTERCEPT(pthread_barrier_destroy);
2004  TSAN_INTERCEPT(pthread_barrier_wait);
2005
2006  TSAN_INTERCEPT(pthread_once);
2007
2008  TSAN_INTERCEPT(sem_init);
2009  TSAN_INTERCEPT(sem_destroy);
2010  TSAN_INTERCEPT(sem_wait);
2011  TSAN_INTERCEPT(sem_trywait);
2012  TSAN_INTERCEPT(sem_timedwait);
2013  TSAN_INTERCEPT(sem_post);
2014  TSAN_INTERCEPT(sem_getvalue);
2015
2016  TSAN_INTERCEPT(stat);
2017  TSAN_INTERCEPT(__xstat);
2018  TSAN_INTERCEPT(stat64);
2019  TSAN_INTERCEPT(__xstat64);
2020  TSAN_INTERCEPT(lstat);
2021  TSAN_INTERCEPT(__lxstat);
2022  TSAN_INTERCEPT(lstat64);
2023  TSAN_INTERCEPT(__lxstat64);
2024  TSAN_INTERCEPT(fstat);
2025  TSAN_INTERCEPT(__fxstat);
2026  TSAN_INTERCEPT(fstat64);
2027  TSAN_INTERCEPT(__fxstat64);
2028  TSAN_INTERCEPT(open);
2029  TSAN_INTERCEPT(open64);
2030  TSAN_INTERCEPT(creat);
2031  TSAN_INTERCEPT(creat64);
2032  TSAN_INTERCEPT(dup);
2033  TSAN_INTERCEPT(dup2);
2034  TSAN_INTERCEPT(dup3);
2035  TSAN_INTERCEPT(eventfd);
2036  TSAN_INTERCEPT(signalfd);
2037  TSAN_INTERCEPT(inotify_init);
2038  TSAN_INTERCEPT(inotify_init1);
2039  TSAN_INTERCEPT(socket);
2040  TSAN_INTERCEPT(socketpair);
2041  TSAN_INTERCEPT(connect);
2042  TSAN_INTERCEPT(bind);
2043  TSAN_INTERCEPT(listen);
2044  TSAN_INTERCEPT(epoll_create);
2045  TSAN_INTERCEPT(epoll_create1);
2046  TSAN_INTERCEPT(close);
2047  TSAN_INTERCEPT(__close);
2048  TSAN_INTERCEPT(__res_iclose);
2049  TSAN_INTERCEPT(pipe);
2050  TSAN_INTERCEPT(pipe2);
2051
2052  TSAN_INTERCEPT(readv);
2053  TSAN_INTERCEPT(preadv64);
2054  TSAN_INTERCEPT(writev);
2055  TSAN_INTERCEPT(pwritev64);
2056  TSAN_INTERCEPT(send);
2057  TSAN_INTERCEPT(sendmsg);
2058  TSAN_INTERCEPT(recv);
2059
2060  TSAN_INTERCEPT(unlink);
2061  TSAN_INTERCEPT(fopen);
2062  TSAN_INTERCEPT(freopen);
2063  TSAN_INTERCEPT(fclose);
2064  TSAN_INTERCEPT(fread);
2065  TSAN_INTERCEPT(fwrite);
2066  TSAN_INTERCEPT(fflush);
2067  TSAN_INTERCEPT(abort);
2068  TSAN_INTERCEPT(puts);
2069  TSAN_INTERCEPT(rmdir);
2070  TSAN_INTERCEPT(opendir);
2071
2072  TSAN_INTERCEPT(epoll_ctl);
2073  TSAN_INTERCEPT(epoll_wait);
2074  TSAN_INTERCEPT(poll);
2075
2076  TSAN_INTERCEPT(sigaction);
2077  TSAN_INTERCEPT(signal);
2078  TSAN_INTERCEPT(raise);
2079  TSAN_INTERCEPT(kill);
2080  TSAN_INTERCEPT(pthread_kill);
2081  TSAN_INTERCEPT(sleep);
2082  TSAN_INTERCEPT(usleep);
2083  TSAN_INTERCEPT(nanosleep);
2084  TSAN_INTERCEPT(gettimeofday);
2085
2086  TSAN_INTERCEPT(mlock);
2087  TSAN_INTERCEPT(munlock);
2088  TSAN_INTERCEPT(mlockall);
2089  TSAN_INTERCEPT(munlockall);
2090
2091  TSAN_INTERCEPT(fork);
2092  TSAN_INTERCEPT(on_exit);
2093  TSAN_INTERCEPT(__cxa_atexit);
2094
2095  // Need to setup it, because interceptors check that the function is resolved.
2096  // But atexit is emitted directly into the module, so can't be resolved.
2097  REAL(atexit) = (int(*)(void(*)()))unreachable;
2098  atexit_ctx = new(internal_alloc(MBlockAtExit, sizeof(AtExitContext)))
2099      AtExitContext();
2100
2101  if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
2102    Printf("ThreadSanitizer: failed to setup atexit callback\n");
2103    Die();
2104  }
2105
2106  if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
2107    Printf("ThreadSanitizer: failed to create thread key\n");
2108    Die();
2109  }
2110
2111  FdInit();
2112}
2113
2114void internal_start_thread(void(*func)(void *arg), void *arg) {
2115  void *th;
2116  REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
2117  REAL(pthread_detach)(th);
2118}
2119
2120}  // namespace __tsan
2121