tsan_interceptors.cc revision ba5e99668e3030cc5bab357a04271a1bdbac209c 
1//===-- tsan_interceptors.cc ----------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file is a part of ThreadSanitizer (TSan), a race detector.
11//
12// FIXME: move as many interceptors as possible into
13// sanitizer_common/sanitizer_common_interceptors.h
14//===----------------------------------------------------------------------===//
15
16#include "sanitizer_common/sanitizer_atomic.h"
17#include "sanitizer_common/sanitizer_libc.h"
18#include "sanitizer_common/sanitizer_placement_new.h"
19#include "sanitizer_common/sanitizer_stacktrace.h"
20#include "interception/interception.h"
21#include "tsan_interface.h"
22#include "tsan_platform.h"
23#include "tsan_rtl.h"
24#include "tsan_mman.h"
25#include "tsan_fd.h"
26
27using namespace __tsan;  // NOLINT
28
29const int kSigCount = 128;
30
31struct my_siginfo_t {
32  int opaque[128];
33};
34
35struct sigset_t {
36  u64 val[1024 / 8 / sizeof(u64)];
37};
38
39struct ucontext_t {
40  uptr opaque[117];
41};
42
43extern "C" int pthread_attr_init(void *attr);
44extern "C" int pthread_attr_destroy(void *attr);
45extern "C" int pthread_attr_getdetachstate(void *attr, int *v);
46extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
47extern "C" int pthread_attr_getstacksize(void *attr, uptr *stacksize);
48extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
49extern "C" int pthread_setspecific(unsigned key, const void *v);
50extern "C" int pthread_mutexattr_gettype(void *a, int *type);
51extern "C" int pthread_yield();
52extern "C" int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);
53extern "C" int sigfillset(sigset_t *set);
54extern "C" void *pthread_self();
55extern "C" void _exit(int status);
56extern "C" int *__errno_location();
57extern "C" int fileno_unlocked(void *stream);
58extern "C" void *__libc_malloc(uptr size);
59extern "C" void *__libc_calloc(uptr size, uptr n);
60extern "C" void *__libc_realloc(void *ptr, uptr size);
61extern "C" void __libc_free(void *ptr);
62const int PTHREAD_MUTEX_RECURSIVE = 1;
63const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
64const int kPthreadAttrSize = 56;
65const int EINVAL = 22;
66const int EBUSY = 16;
67const int EPOLL_CTL_ADD = 1;
68const int SIGILL = 4;
69const int SIGABRT = 6;
70const int SIGFPE = 8;
71const int SIGSEGV = 11;
72const int SIGPIPE = 13;
73const int SIGBUS = 7;
74void *const MAP_FAILED = (void*)-1;
75const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
76const int MAP_FIXED = 0x10;
77typedef long long_t;  // NOLINT
78
79// From /usr/include/unistd.h
80# define F_ULOCK 0      /* Unlock a previously locked region.  */
81# define F_LOCK  1      /* Lock a region for exclusive use.  */
82# define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
83# define F_TEST  3      /* Test a region for other processes locks.  */
84
85typedef void (*sighandler_t)(int sig);
86
87#define errno (*__errno_location())
88
89union pthread_attr_t {
90  char size[kPthreadAttrSize];
91  void *align;
92};
93
94struct sigaction_t {
95  union {
96    sighandler_t sa_handler;
97    void (*sa_sigaction)(int sig, my_siginfo_t *siginfo, void *uctx);
98  };
99  sigset_t sa_mask;
100  int sa_flags;
101  void (*sa_restorer)();
102};
103
104const sighandler_t SIG_DFL = (sighandler_t)0;
105const sighandler_t SIG_IGN = (sighandler_t)1;
106const sighandler_t SIG_ERR = (sighandler_t)-1;
107const int SA_SIGINFO = 4;
108const int SIG_SETMASK = 2;
109
110namespace std {
111struct nothrow_t {};
112}  // namespace std
113
114static sigaction_t sigactions[kSigCount];
115
116namespace __tsan {
117struct SignalDesc {
118  bool armed;
119  bool sigaction;
120  my_siginfo_t siginfo;
121  ucontext_t ctx;
122};
123
124struct SignalContext {
125  int in_blocking_func;
126  int int_signal_send;
127  int pending_signal_count;
128  SignalDesc pending_signals[kSigCount];
129};
130}  // namespace __tsan
131
132static SignalContext *SigCtx(ThreadState *thr) {
133  SignalContext *ctx = (SignalContext*)thr->signal_ctx;
134  if (ctx == 0 && thr->is_alive) {
135    ScopedInRtl in_rtl;
136    ctx = (SignalContext*)MmapOrDie(sizeof(*ctx), "SignalContext");
137    MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
138    thr->signal_ctx = ctx;
139  }
140  return ctx;
141}
142
143static unsigned g_thread_finalize_key;
144
145class ScopedInterceptor {
146 public:
147  ScopedInterceptor(ThreadState *thr, const char *fname, uptr pc);
148  ~ScopedInterceptor();
149 private:
150  ThreadState *const thr_;
151  const int in_rtl_;
152};
153
154ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
155                                     uptr pc)
156    : thr_(thr)
157    , in_rtl_(thr->in_rtl) {
158  if (thr_->in_rtl == 0) {
159    Initialize(thr);
160    FuncEntry(thr, pc);
161    thr_->in_rtl++;
162    DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
163  } else {
164    thr_->in_rtl++;
165  }
166}
167
168ScopedInterceptor::~ScopedInterceptor() {
169  thr_->in_rtl--;
170  if (thr_->in_rtl == 0) {
171    FuncExit(thr_);
172    ProcessPendingSignals(thr_);
173  }
174  CHECK_EQ(in_rtl_, thr_->in_rtl);
175}
176
177#define SCOPED_INTERCEPTOR_RAW(func, ...) \
178    ThreadState *thr = cur_thread(); \
179    StatInc(thr, StatInterceptor); \
180    StatInc(thr, StatInt_##func); \
181    const uptr caller_pc = GET_CALLER_PC(); \
182    ScopedInterceptor si(thr, #func, caller_pc); \
183    const uptr pc = __sanitizer::StackTrace::GetPreviousInstructionPc( \
184        __sanitizer::StackTrace::GetCurrentPc()); \
185    (void)pc; \
186/**/
187
188#define SCOPED_TSAN_INTERCEPTOR(func, ...) \
189    SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
190    if (REAL(func) == 0) { \
191      Printf("FATAL: ThreadSanitizer: failed to intercept %s\n", #func); \
192      Die(); \
193    } \
194    if (thr->in_rtl > 1) \
195      return REAL(func)(__VA_ARGS__); \
196/**/
197
198#define TSAN_INTERCEPTOR(ret, func, ...) INTERCEPTOR(ret, func, __VA_ARGS__)
199#define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
200
201#define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
202
203struct BlockingCall {
204  explicit BlockingCall(ThreadState *thr)
205      : ctx(SigCtx(thr)) {
206    ctx->in_blocking_func++;
207  }
208
209  ~BlockingCall() {
210    ctx->in_blocking_func--;
211  }
212
213  SignalContext *ctx;
214};
215
216TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
217  SCOPED_TSAN_INTERCEPTOR(sleep, sec);
218  unsigned res = BLOCK_REAL(sleep)(sec);
219  AfterSleep(thr, pc);
220  return res;
221}
222
223TSAN_INTERCEPTOR(int, usleep, long_t usec) {
224  SCOPED_TSAN_INTERCEPTOR(usleep, usec);
225  int res = BLOCK_REAL(usleep)(usec);
226  AfterSleep(thr, pc);
227  return res;
228}
229
230TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
231  SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
232  int res = BLOCK_REAL(nanosleep)(req, rem);
233  AfterSleep(thr, pc);
234  return res;
235}
236
237class AtExitContext {
238 public:
239  AtExitContext()
240    : mtx_(MutexTypeAtExit, StatMtxAtExit)
241    , pos_() {
242  }
243
244  typedef void(*atexit_t)();
245
246  int atexit(ThreadState *thr, uptr pc, bool is_on_exit,
247             atexit_t f, void *arg) {
248    Lock l(&mtx_);
249    if (pos_ == kMaxAtExit)
250      return 1;
251    Release(thr, pc, (uptr)this);
252    stack_[pos_] = f;
253    args_[pos_] = arg;
254    is_on_exits_[pos_] = is_on_exit;
255    pos_++;
256    return 0;
257  }
258
259  void exit(ThreadState *thr, uptr pc) {
260    CHECK_EQ(thr->in_rtl, 0);
261    for (;;) {
262      atexit_t f = 0;
263      void *arg = 0;
264      bool is_on_exit = false;
265      {
266        Lock l(&mtx_);
267        if (pos_) {
268          pos_--;
269          f = stack_[pos_];
270          arg = args_[pos_];
271          is_on_exit = is_on_exits_[pos_];
272          ScopedInRtl in_rtl;
273          Acquire(thr, pc, (uptr)this);
274        }
275      }
276      if (f == 0)
277        break;
278      DPrintf("#%d: executing atexit func %p\n", thr->tid, f);
279      CHECK_EQ(thr->in_rtl, 0);
280      if (is_on_exit)
281        ((void(*)(int status, void *arg))f)(0, arg);
282      else
283        ((void(*)(void *arg, void *dso))f)(arg, 0);
284    }
285  }
286
287 private:
288  static const int kMaxAtExit = 128;
289  Mutex mtx_;
290  atexit_t stack_[kMaxAtExit];
291  void *args_[kMaxAtExit];
292  bool is_on_exits_[kMaxAtExit];
293  int pos_;
294};
295
296static AtExitContext *atexit_ctx;
297
298static void finalize(void *arg) {
299  ThreadState * thr = cur_thread();
300  uptr pc = 0;
301  atexit_ctx->exit(thr, pc);
302  int status = Finalize(cur_thread());
303  if (status)
304    _exit(status);
305}
306
307TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
308  if (cur_thread()->in_symbolizer)
309    return 0;
310  SCOPED_TSAN_INTERCEPTOR(atexit, f);
311  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, 0);
312}
313
314TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
315  if (cur_thread()->in_symbolizer)
316    return 0;
317  SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
318  return atexit_ctx->atexit(thr, pc, true, (void(*)())f, arg);
319}
320
321TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {
322  if (cur_thread()->in_symbolizer)
323    return 0;
324  SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
325  if (dso)
326    return REAL(__cxa_atexit)(f, arg, dso);
327  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, arg);
328}
329
330TSAN_INTERCEPTOR(void, longjmp, void *env, int val) {
331  SCOPED_TSAN_INTERCEPTOR(longjmp, env, val);
332  Printf("ThreadSanitizer: longjmp() is not supported\n");
333  Die();
334}
335
336TSAN_INTERCEPTOR(void, siglongjmp, void *env, int val) {
337  SCOPED_TSAN_INTERCEPTOR(siglongjmp, env, val);
338  Printf("ThreadSanitizer: siglongjmp() is not supported\n");
339  Die();
340}
341
342TSAN_INTERCEPTOR(void*, malloc, uptr size) {
343  if (cur_thread()->in_symbolizer)
344    return __libc_malloc(size);
345  void *p = 0;
346  {
347    SCOPED_INTERCEPTOR_RAW(malloc, size);
348    p = user_alloc(thr, pc, size);
349  }
350  invoke_malloc_hook(p, size);
351  return p;
352}
353
354TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
355  SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
356  return user_alloc(thr, pc, sz, align);
357}
358
359TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
360  if (cur_thread()->in_symbolizer)
361    return __libc_calloc(size, n);
362  if (__sanitizer::CallocShouldReturnNullDueToOverflow(size, n)) return 0;
363  void *p = 0;
364  {
365    SCOPED_INTERCEPTOR_RAW(calloc, size, n);
366    p = user_alloc(thr, pc, n * size);
367    if (p) internal_memset(p, 0, n * size);
368  }
369  invoke_malloc_hook(p, n * size);
370  return p;
371}
372
373TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
374  if (cur_thread()->in_symbolizer)
375    return __libc_realloc(p, size);
376  if (p)
377    invoke_free_hook(p);
378  {
379    SCOPED_INTERCEPTOR_RAW(realloc, p, size);
380    p = user_realloc(thr, pc, p, size);
381  }
382  invoke_malloc_hook(p, size);
383  return p;
384}
385
386TSAN_INTERCEPTOR(void, free, void *p) {
387  if (p == 0)
388    return;
389  if (cur_thread()->in_symbolizer)
390    return __libc_free(p);
391  invoke_free_hook(p);
392  SCOPED_INTERCEPTOR_RAW(free, p);
393  user_free(thr, pc, p);
394}
395
396TSAN_INTERCEPTOR(void, cfree, void *p) {
397  if (p == 0)
398    return;
399  if (cur_thread()->in_symbolizer)
400    return __libc_free(p);
401  invoke_free_hook(p);
402  SCOPED_INTERCEPTOR_RAW(cfree, p);
403  user_free(thr, pc, p);
404}
405
406#define OPERATOR_NEW_BODY(mangled_name) \
407  if (cur_thread()->in_symbolizer) \
408    return __libc_malloc(size); \
409  void *p = 0; \
410  {  \
411    SCOPED_INTERCEPTOR_RAW(mangled_name, size); \
412    p = user_alloc(thr, pc, size); \
413  }  \
414  invoke_malloc_hook(p, size);  \
415  return p;
416
417void *operator new(__sanitizer::uptr size) {
418  OPERATOR_NEW_BODY(_Znwm);
419}
420void *operator new[](__sanitizer::uptr size) {
421  OPERATOR_NEW_BODY(_Znam);
422}
423void *operator new(__sanitizer::uptr size, std::nothrow_t const&) {
424  OPERATOR_NEW_BODY(_ZnwmRKSt9nothrow_t);
425}
426void *operator new[](__sanitizer::uptr size, std::nothrow_t const&) {
427  OPERATOR_NEW_BODY(_ZnamRKSt9nothrow_t);
428}
429
430#define OPERATOR_DELETE_BODY(mangled_name) \
431  if (ptr == 0) return;  \
432  if (cur_thread()->in_symbolizer) \
433    return __libc_free(ptr); \
434  invoke_free_hook(ptr);  \
435  SCOPED_INTERCEPTOR_RAW(mangled_name, ptr);  \
436  user_free(thr, pc, ptr);
437
438void operator delete(void *ptr) {
439  OPERATOR_DELETE_BODY(_ZdlPv);
440}
441void operator delete[](void *ptr) {
442  OPERATOR_DELETE_BODY(_ZdlPvRKSt9nothrow_t);
443}
444void operator delete(void *ptr, std::nothrow_t const&) {
445  OPERATOR_DELETE_BODY(_ZdaPv);
446}
447void operator delete[](void *ptr, std::nothrow_t const&) {
448  OPERATOR_DELETE_BODY(_ZdaPvRKSt9nothrow_t);
449}
450
451TSAN_INTERCEPTOR(uptr, strlen, const char *s) {
452  SCOPED_TSAN_INTERCEPTOR(strlen, s);
453  uptr len = internal_strlen(s);
454  MemoryAccessRange(thr, pc, (uptr)s, len + 1, false);
455  return len;
456}
457
458TSAN_INTERCEPTOR(void*, memset, void *dst, int v, uptr size) {
459  SCOPED_TSAN_INTERCEPTOR(memset, dst, v, size);
460  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
461  return internal_memset(dst, v, size);
462}
463
464TSAN_INTERCEPTOR(void*, memcpy, void *dst, const void *src, uptr size) {
465  SCOPED_TSAN_INTERCEPTOR(memcpy, dst, src, size);
466  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
467  MemoryAccessRange(thr, pc, (uptr)src, size, false);
468  return internal_memcpy(dst, src, size);
469}
470
471TSAN_INTERCEPTOR(int, memcmp, const void *s1, const void *s2, uptr n) {
472  SCOPED_TSAN_INTERCEPTOR(memcmp, s1, s2, n);
473  int res = 0;
474  uptr len = 0;
475  for (; len < n; len++) {
476    if ((res = ((unsigned char*)s1)[len] - ((unsigned char*)s2)[len]))
477      break;
478  }
479  MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
480  MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
481  return res;
482}
483
484TSAN_INTERCEPTOR(int, strcmp, const char *s1, const char *s2) {
485  SCOPED_TSAN_INTERCEPTOR(strcmp, s1, s2);
486  uptr len = 0;
487  for (; s1[len] && s2[len]; len++) {
488    if (s1[len] != s2[len])
489      break;
490  }
491  MemoryAccessRange(thr, pc, (uptr)s1, len + 1, false);
492  MemoryAccessRange(thr, pc, (uptr)s2, len + 1, false);
493  return s1[len] - s2[len];
494}
495
496TSAN_INTERCEPTOR(int, strncmp, const char *s1, const char *s2, uptr n) {
497  SCOPED_TSAN_INTERCEPTOR(strncmp, s1, s2, n);
498  uptr len = 0;
499  for (; len < n && s1[len] && s2[len]; len++) {
500    if (s1[len] != s2[len])
501      break;
502  }
503  MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
504  MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
505  return len == n ? 0 : s1[len] - s2[len];
506}
507
508TSAN_INTERCEPTOR(void*, memchr, void *s, int c, uptr n) {
509  SCOPED_TSAN_INTERCEPTOR(memchr, s, c, n);
510  void *res = REAL(memchr)(s, c, n);
511  uptr len = res ? (char*)res - (char*)s + 1 : n;
512  MemoryAccessRange(thr, pc, (uptr)s, len, false);
513  return res;
514}
515
516TSAN_INTERCEPTOR(void*, memrchr, char *s, int c, uptr n) {
517  SCOPED_TSAN_INTERCEPTOR(memrchr, s, c, n);
518  MemoryAccessRange(thr, pc, (uptr)s, n, false);
519  return REAL(memrchr)(s, c, n);
520}
521
522TSAN_INTERCEPTOR(void*, memmove, void *dst, void *src, uptr n) {
523  SCOPED_TSAN_INTERCEPTOR(memmove, dst, src, n);
524  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
525  MemoryAccessRange(thr, pc, (uptr)src, n, false);
526  return REAL(memmove)(dst, src, n);
527}
528
529TSAN_INTERCEPTOR(char*, strchr, char *s, int c) {
530  SCOPED_TSAN_INTERCEPTOR(strchr, s, c);
531  char *res = REAL(strchr)(s, c);
532  uptr len = res ? (char*)res - (char*)s + 1 : internal_strlen(s) + 1;
533  MemoryAccessRange(thr, pc, (uptr)s, len, false);
534  return res;
535}
536
537TSAN_INTERCEPTOR(char*, strchrnul, char *s, int c) {
538  SCOPED_TSAN_INTERCEPTOR(strchrnul, s, c);
539  char *res = REAL(strchrnul)(s, c);
540  uptr len = (char*)res - (char*)s + 1;
541  MemoryAccessRange(thr, pc, (uptr)s, len, false);
542  return res;
543}
544
545TSAN_INTERCEPTOR(char*, strrchr, char *s, int c) {
546  SCOPED_TSAN_INTERCEPTOR(strrchr, s, c);
547  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s) + 1, false);
548  return REAL(strrchr)(s, c);
549}
550
551TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) {  // NOLINT
552  SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);  // NOLINT
553  uptr srclen = internal_strlen(src);
554  MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
555  MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
556  return REAL(strcpy)(dst, src);  // NOLINT
557}
558
559TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
560  SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
561  uptr srclen = internal_strnlen(src, n);
562  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
563  MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
564  return REAL(strncpy)(dst, src, n);
565}
566
567TSAN_INTERCEPTOR(const char*, strstr, const char *s1, const char *s2) {
568  SCOPED_TSAN_INTERCEPTOR(strstr, s1, s2);
569  const char *res = REAL(strstr)(s1, s2);
570  uptr len1 = internal_strlen(s1);
571  uptr len2 = internal_strlen(s2);
572  MemoryAccessRange(thr, pc, (uptr)s1, len1 + 1, false);
573  MemoryAccessRange(thr, pc, (uptr)s2, len2 + 1, false);
574  return res;
575}
576
577static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
578  if (*addr) {
579    if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
580      if (flags & MAP_FIXED) {
581        errno = EINVAL;
582        return false;
583      } else {
584        *addr = 0;
585      }
586    }
587  }
588  return true;
589}
590
591TSAN_INTERCEPTOR(void*, mmap, void *addr, long_t sz, int prot,
592                         int flags, int fd, unsigned off) {
593  SCOPED_TSAN_INTERCEPTOR(mmap, addr, sz, prot, flags, fd, off);
594  if (!fix_mmap_addr(&addr, sz, flags))
595    return MAP_FAILED;
596  void *res = REAL(mmap)(addr, sz, prot, flags, fd, off);
597  if (res != MAP_FAILED) {
598    MemoryResetRange(thr, pc, (uptr)res, sz);
599  }
600  return res;
601}
602
603TSAN_INTERCEPTOR(void*, mmap64, void *addr, long_t sz, int prot,
604                           int flags, int fd, u64 off) {
605  SCOPED_TSAN_INTERCEPTOR(mmap64, addr, sz, prot, flags, fd, off);
606  if (!fix_mmap_addr(&addr, sz, flags))
607    return MAP_FAILED;
608  void *res = REAL(mmap64)(addr, sz, prot, flags, fd, off);
609  if (res != MAP_FAILED) {
610    MemoryResetRange(thr, pc, (uptr)res, sz);
611  }
612  return res;
613}
614
615TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
616  SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
617  int res = REAL(munmap)(addr, sz);
618  return res;
619}
620
621TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
622  SCOPED_TSAN_INTERCEPTOR(memalign, align, sz);
623  return user_alloc(thr, pc, sz, align);
624}
625
626TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
627  SCOPED_TSAN_INTERCEPTOR(valloc, sz);
628  return user_alloc(thr, pc, sz, GetPageSizeCached());
629}
630
631TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
632  SCOPED_TSAN_INTERCEPTOR(pvalloc, sz);
633  sz = RoundUp(sz, GetPageSizeCached());
634  return user_alloc(thr, pc, sz, GetPageSizeCached());
635}
636
637TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
638  SCOPED_TSAN_INTERCEPTOR(posix_memalign, memptr, align, sz);
639  *memptr = user_alloc(thr, pc, sz, align);
640  return 0;
641}
642
643// Used in thread-safe function static initialization.
644extern "C" int INTERFACE_ATTRIBUTE __cxa_guard_acquire(atomic_uint32_t *g) {
645  SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
646  for (;;) {
647    u32 cmp = atomic_load(g, memory_order_acquire);
648    if (cmp == 0) {
649      if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
650        return 1;
651    } else if (cmp == 1) {
652      Acquire(thr, pc, (uptr)g);
653      return 0;
654    } else {
655      internal_sched_yield();
656    }
657  }
658}
659
660extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_release(atomic_uint32_t *g) {
661  SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
662  Release(thr, pc, (uptr)g);
663  atomic_store(g, 1, memory_order_release);
664}
665
666extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_abort(atomic_uint32_t *g) {
667  SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
668  atomic_store(g, 0, memory_order_relaxed);
669}
670
671static void thread_finalize(void *v) {
672  uptr iter = (uptr)v;
673  if (iter > 1) {
674    if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
675      Printf("ThreadSanitizer: failed to set thread key\n");
676      Die();
677    }
678    return;
679  }
680  {
681    ScopedInRtl in_rtl;
682    ThreadState *thr = cur_thread();
683    ThreadFinish(thr);
684    SignalContext *sctx = thr->signal_ctx;
685    if (sctx) {
686      thr->signal_ctx = 0;
687      UnmapOrDie(sctx, sizeof(*sctx));
688    }
689  }
690}
691
692
693struct ThreadParam {
694  void* (*callback)(void *arg);
695  void *param;
696  atomic_uintptr_t tid;
697};
698
699extern "C" void *__tsan_thread_start_func(void *arg) {
700  ThreadParam *p = (ThreadParam*)arg;
701  void* (*callback)(void *arg) = p->callback;
702  void *param = p->param;
703  int tid = 0;
704  {
705    ThreadState *thr = cur_thread();
706    ScopedInRtl in_rtl;
707    if (pthread_setspecific(g_thread_finalize_key, (void*)4)) {
708      Printf("ThreadSanitizer: failed to set thread key\n");
709      Die();
710    }
711    while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
712      pthread_yield();
713    atomic_store(&p->tid, 0, memory_order_release);
714    ThreadStart(thr, tid, GetTid());
715    CHECK_EQ(thr->in_rtl, 1);
716  }
717  void *res = callback(param);
718  // Prevent the callback from being tail called,
719  // it mixes up stack traces.
720  volatile int foo = 42;
721  foo++;
722  return res;
723}
724
725TSAN_INTERCEPTOR(int, pthread_create,
726    void *th, void *attr, void *(*callback)(void*), void * param) {
727  SCOPED_TSAN_INTERCEPTOR(pthread_create, th, attr, callback, param);
728  pthread_attr_t myattr;
729  if (attr == 0) {
730    pthread_attr_init(&myattr);
731    attr = &myattr;
732  }
733  int detached = 0;
734  pthread_attr_getdetachstate(attr, &detached);
735  uptr stacksize = 0;
736  pthread_attr_getstacksize(attr, &stacksize);
737  // We place the huge ThreadState object into TLS, account for that.
738  const uptr minstacksize = GetTlsSize() + 128*1024;
739  if (stacksize < minstacksize) {
740    DPrintf("ThreadSanitizer: stacksize %zu->%zu\n", stacksize, minstacksize);
741    pthread_attr_setstacksize(attr, minstacksize);
742  }
743  ThreadParam p;
744  p.callback = callback;
745  p.param = param;
746  atomic_store(&p.tid, 0, memory_order_relaxed);
747  int res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
748  if (res == 0) {
749    int tid = ThreadCreate(thr, pc, *(uptr*)th, detached);
750    CHECK_NE(tid, 0);
751    atomic_store(&p.tid, tid, memory_order_release);
752    while (atomic_load(&p.tid, memory_order_acquire) != 0)
753      pthread_yield();
754  }
755  if (attr == &myattr)
756    pthread_attr_destroy(&myattr);
757  return res;
758}
759
760TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
761  SCOPED_TSAN_INTERCEPTOR(pthread_join, th, ret);
762  int tid = ThreadTid(thr, pc, (uptr)th);
763  int res = BLOCK_REAL(pthread_join)(th, ret);
764  if (res == 0) {
765    ThreadJoin(thr, pc, tid);
766  }
767  return res;
768}
769
770TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
771  SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
772  int tid = ThreadTid(thr, pc, (uptr)th);
773  int res = REAL(pthread_detach)(th);
774  if (res == 0) {
775    ThreadDetach(thr, pc, tid);
776  }
777  return res;
778}
779
780TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
781  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
782  int res = REAL(pthread_mutex_init)(m, a);
783  if (res == 0) {
784    bool recursive = false;
785    if (a) {
786      int type = 0;
787      if (pthread_mutexattr_gettype(a, &type) == 0)
788        recursive = (type == PTHREAD_MUTEX_RECURSIVE
789            || type == PTHREAD_MUTEX_RECURSIVE_NP);
790    }
791    MutexCreate(thr, pc, (uptr)m, false, recursive, false);
792  }
793  return res;
794}
795
796TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
797  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
798  int res = REAL(pthread_mutex_destroy)(m);
799  if (res == 0 || res == EBUSY) {
800    MutexDestroy(thr, pc, (uptr)m);
801  }
802  return res;
803}
804
805TSAN_INTERCEPTOR(int, pthread_mutex_lock, void *m) {
806  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_lock, m);
807  int res = REAL(pthread_mutex_lock)(m);
808  if (res == 0) {
809    MutexLock(thr, pc, (uptr)m);
810  }
811  return res;
812}
813
814TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
815  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
816  int res = REAL(pthread_mutex_trylock)(m);
817  if (res == 0) {
818    MutexLock(thr, pc, (uptr)m);
819  }
820  return res;
821}
822
823TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
824  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
825  int res = REAL(pthread_mutex_timedlock)(m, abstime);
826  if (res == 0) {
827    MutexLock(thr, pc, (uptr)m);
828  }
829  return res;
830}
831
832TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {
833  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_unlock, m);
834  MutexUnlock(thr, pc, (uptr)m);
835  int res = REAL(pthread_mutex_unlock)(m);
836  return res;
837}
838
839TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
840  SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
841  int res = REAL(pthread_spin_init)(m, pshared);
842  if (res == 0) {
843    MutexCreate(thr, pc, (uptr)m, false, false, false);
844  }
845  return res;
846}
847
848TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
849  SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
850  int res = REAL(pthread_spin_destroy)(m);
851  if (res == 0) {
852    MutexDestroy(thr, pc, (uptr)m);
853  }
854  return res;
855}
856
857TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
858  SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
859  int res = REAL(pthread_spin_lock)(m);
860  if (res == 0) {
861    MutexLock(thr, pc, (uptr)m);
862  }
863  return res;
864}
865
866TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
867  SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
868  int res = REAL(pthread_spin_trylock)(m);
869  if (res == 0) {
870    MutexLock(thr, pc, (uptr)m);
871  }
872  return res;
873}
874
875TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
876  SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
877  MutexUnlock(thr, pc, (uptr)m);
878  int res = REAL(pthread_spin_unlock)(m);
879  return res;
880}
881
882TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
883  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
884  int res = REAL(pthread_rwlock_init)(m, a);
885  if (res == 0) {
886    MutexCreate(thr, pc, (uptr)m, true, false, false);
887  }
888  return res;
889}
890
891TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
892  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
893  int res = REAL(pthread_rwlock_destroy)(m);
894  if (res == 0) {
895    MutexDestroy(thr, pc, (uptr)m);
896  }
897  return res;
898}
899
900TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
901  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
902  int res = REAL(pthread_rwlock_rdlock)(m);
903  if (res == 0) {
904    MutexReadLock(thr, pc, (uptr)m);
905  }
906  return res;
907}
908
909TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
910  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
911  int res = REAL(pthread_rwlock_tryrdlock)(m);
912  if (res == 0) {
913    MutexReadLock(thr, pc, (uptr)m);
914  }
915  return res;
916}
917
918TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
919  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
920  int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
921  if (res == 0) {
922    MutexReadLock(thr, pc, (uptr)m);
923  }
924  return res;
925}
926
927TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
928  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
929  int res = REAL(pthread_rwlock_wrlock)(m);
930  if (res == 0) {
931    MutexLock(thr, pc, (uptr)m);
932  }
933  return res;
934}
935
936TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
937  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
938  int res = REAL(pthread_rwlock_trywrlock)(m);
939  if (res == 0) {
940    MutexLock(thr, pc, (uptr)m);
941  }
942  return res;
943}
944
945TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
946  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
947  int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
948  if (res == 0) {
949    MutexLock(thr, pc, (uptr)m);
950  }
951  return res;
952}
953
954TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
955  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
956  MutexReadOrWriteUnlock(thr, pc, (uptr)m);
957  int res = REAL(pthread_rwlock_unlock)(m);
958  return res;
959}
960
961// libpthread.so contains several versions of pthread_cond_init symbol.
962// When we just dlsym() it, we get the wrong (old) version.
963/*
964TSAN_INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
965  SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, c, a);
966  int res = REAL(pthread_cond_init)(c, a);
967  return res;
968}
969*/
970
971TSAN_INTERCEPTOR(int, pthread_cond_destroy, void *c) {
972  SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, c);
973  int res = REAL(pthread_cond_destroy)(c);
974  return res;
975}
976
977TSAN_INTERCEPTOR(int, pthread_cond_signal, void *c) {
978  SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, c);
979  int res = REAL(pthread_cond_signal)(c);
980  return res;
981}
982
983TSAN_INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
984  SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, c);
985  int res = REAL(pthread_cond_broadcast)(c);
986  return res;
987}
988
989TSAN_INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
990  SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, c, m);
991  MutexUnlock(thr, pc, (uptr)m);
992  int res = REAL(pthread_cond_wait)(c, m);
993  MutexLock(thr, pc, (uptr)m);
994  return res;
995}
996
997TSAN_INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m, void *abstime) {
998  SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, c, m, abstime);
999  MutexUnlock(thr, pc, (uptr)m);
1000  int res = REAL(pthread_cond_timedwait)(c, m, abstime);
1001  MutexLock(thr, pc, (uptr)m);
1002  return res;
1003}
1004
1005TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1006  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1007  MemoryWrite1Byte(thr, pc, (uptr)b);
1008  int res = REAL(pthread_barrier_init)(b, a, count);
1009  return res;
1010}
1011
1012TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1013  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1014  MemoryWrite1Byte(thr, pc, (uptr)b);
1015  int res = REAL(pthread_barrier_destroy)(b);
1016  return res;
1017}
1018
1019TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1020  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1021  Release(thr, pc, (uptr)b);
1022  MemoryRead1Byte(thr, pc, (uptr)b);
1023  int res = REAL(pthread_barrier_wait)(b);
1024  MemoryRead1Byte(thr, pc, (uptr)b);
1025  if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1026    Acquire(thr, pc, (uptr)b);
1027  }
1028  return res;
1029}
1030
1031TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1032  SCOPED_TSAN_INTERCEPTOR(pthread_once, o, f);
1033  if (o == 0 || f == 0)
1034    return EINVAL;
1035  atomic_uint32_t *a = static_cast<atomic_uint32_t*>(o);
1036  u32 v = atomic_load(a, memory_order_acquire);
1037  if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1038                                               memory_order_relaxed)) {
1039    const int old_in_rtl = thr->in_rtl;
1040    thr->in_rtl = 0;
1041    (*f)();
1042    CHECK_EQ(thr->in_rtl, 0);
1043    thr->in_rtl = old_in_rtl;
1044    Release(thr, pc, (uptr)o);
1045    atomic_store(a, 2, memory_order_release);
1046  } else {
1047    while (v != 2) {
1048      pthread_yield();
1049      v = atomic_load(a, memory_order_acquire);
1050    }
1051    Acquire(thr, pc, (uptr)o);
1052  }
1053  return 0;
1054}
1055
1056TSAN_INTERCEPTOR(int, sem_init, void *s, int pshared, unsigned value) {
1057  SCOPED_TSAN_INTERCEPTOR(sem_init, s, pshared, value);
1058  int res = REAL(sem_init)(s, pshared, value);
1059  return res;
1060}
1061
1062TSAN_INTERCEPTOR(int, sem_destroy, void *s) {
1063  SCOPED_TSAN_INTERCEPTOR(sem_destroy, s);
1064  int res = REAL(sem_destroy)(s);
1065  return res;
1066}
1067
1068TSAN_INTERCEPTOR(int, sem_wait, void *s) {
1069  SCOPED_TSAN_INTERCEPTOR(sem_wait, s);
1070  int res = BLOCK_REAL(sem_wait)(s);
1071  if (res == 0) {
1072    Acquire(thr, pc, (uptr)s);
1073  }
1074  return res;
1075}
1076
1077TSAN_INTERCEPTOR(int, sem_trywait, void *s) {
1078  SCOPED_TSAN_INTERCEPTOR(sem_trywait, s);
1079  int res = BLOCK_REAL(sem_trywait)(s);
1080  if (res == 0) {
1081    Acquire(thr, pc, (uptr)s);
1082  }
1083  return res;
1084}
1085
1086TSAN_INTERCEPTOR(int, sem_timedwait, void *s, void *abstime) {
1087  SCOPED_TSAN_INTERCEPTOR(sem_timedwait, s, abstime);
1088  int res = BLOCK_REAL(sem_timedwait)(s, abstime);
1089  if (res == 0) {
1090    Acquire(thr, pc, (uptr)s);
1091  }
1092  return res;
1093}
1094
1095TSAN_INTERCEPTOR(int, sem_post, void *s) {
1096  SCOPED_TSAN_INTERCEPTOR(sem_post, s);
1097  Release(thr, pc, (uptr)s);
1098  int res = REAL(sem_post)(s);
1099  return res;
1100}
1101
1102TSAN_INTERCEPTOR(int, sem_getvalue, void *s, int *sval) {
1103  SCOPED_TSAN_INTERCEPTOR(sem_getvalue, s, sval);
1104  int res = REAL(sem_getvalue)(s, sval);
1105  if (res == 0) {
1106    Acquire(thr, pc, (uptr)s);
1107  }
1108  return res;
1109}
1110
1111TSAN_INTERCEPTOR(int, __xstat, int version, const char *path, void *buf) {
1112  SCOPED_TSAN_INTERCEPTOR(__xstat, version, path, buf);
1113  return REAL(__xstat)(version, path, buf);
1114}
1115
1116TSAN_INTERCEPTOR(int, stat, const char *path, void *buf) {
1117  SCOPED_TSAN_INTERCEPTOR(__xstat, 0, path, buf);
1118  return REAL(__xstat)(0, path, buf);
1119}
1120
1121TSAN_INTERCEPTOR(int, __xstat64, int version, const char *path, void *buf) {
1122  SCOPED_TSAN_INTERCEPTOR(__xstat64, version, path, buf);
1123  return REAL(__xstat64)(version, path, buf);
1124}
1125
1126TSAN_INTERCEPTOR(int, stat64, const char *path, void *buf) {
1127  SCOPED_TSAN_INTERCEPTOR(__xstat64, 0, path, buf);
1128  return REAL(__xstat64)(0, path, buf);
1129}
1130
1131TSAN_INTERCEPTOR(int, __lxstat, int version, const char *path, void *buf) {
1132  SCOPED_TSAN_INTERCEPTOR(__lxstat, version, path, buf);
1133  return REAL(__lxstat)(version, path, buf);
1134}
1135
1136TSAN_INTERCEPTOR(int, lstat, const char *path, void *buf) {
1137  SCOPED_TSAN_INTERCEPTOR(__lxstat, 0, path, buf);
1138  return REAL(__lxstat)(0, path, buf);
1139}
1140
1141TSAN_INTERCEPTOR(int, __lxstat64, int version, const char *path, void *buf) {
1142  SCOPED_TSAN_INTERCEPTOR(__lxstat64, version, path, buf);
1143  return REAL(__lxstat64)(version, path, buf);
1144}
1145
1146TSAN_INTERCEPTOR(int, lstat64, const char *path, void *buf) {
1147  SCOPED_TSAN_INTERCEPTOR(__lxstat64, 0, path, buf);
1148  return REAL(__lxstat64)(0, path, buf);
1149}
1150
1151TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1152  SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1153  return REAL(__fxstat)(version, fd, buf);
1154}
1155
1156TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1157  SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
1158  return REAL(__fxstat)(0, fd, buf);
1159}
1160
1161TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1162  SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1163  return REAL(__fxstat64)(version, fd, buf);
1164}
1165
1166TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1167  SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
1168  return REAL(__fxstat64)(0, fd, buf);
1169}
1170
1171TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1172  SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1173  int fd = REAL(open)(name, flags, mode);
1174  if (fd >= 0)
1175    FdFileCreate(thr, pc, fd);
1176  return fd;
1177}
1178
1179TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
1180  SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
1181  int fd = REAL(open64)(name, flags, mode);
1182  if (fd >= 0)
1183    FdFileCreate(thr, pc, fd);
1184  return fd;
1185}
1186
1187TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1188  SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1189  int fd = REAL(creat)(name, mode);
1190  if (fd >= 0)
1191    FdFileCreate(thr, pc, fd);
1192  return fd;
1193}
1194
1195TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1196  SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1197  int fd = REAL(creat64)(name, mode);
1198  if (fd >= 0)
1199    FdFileCreate(thr, pc, fd);
1200  return fd;
1201}
1202
1203TSAN_INTERCEPTOR(int, dup, int oldfd) {
1204  SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1205  int newfd = REAL(dup)(oldfd);
1206  if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1207    FdDup(thr, pc, oldfd, newfd);
1208  return newfd;
1209}
1210
1211TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1212  SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1213  int newfd2 = REAL(dup2)(oldfd, newfd);
1214  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1215    FdDup(thr, pc, oldfd, newfd2);
1216  return newfd2;
1217}
1218
1219TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1220  SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1221  int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1222  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1223    FdDup(thr, pc, oldfd, newfd2);
1224  return newfd2;
1225}
1226
1227TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1228  SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1229  int fd = REAL(eventfd)(initval, flags);
1230  if (fd >= 0)
1231    FdEventCreate(thr, pc, fd);
1232  return fd;
1233}
1234
1235TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1236  SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1237  if (fd >= 0)
1238    FdClose(thr, pc, fd);
1239  fd = REAL(signalfd)(fd, mask, flags);
1240  if (fd >= 0)
1241    FdSignalCreate(thr, pc, fd);
1242  return fd;
1243}
1244
1245TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1246  SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1247  int fd = REAL(inotify_init)(fake);
1248  if (fd >= 0)
1249    FdInotifyCreate(thr, pc, fd);
1250  return fd;
1251}
1252
1253TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1254  SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1255  int fd = REAL(inotify_init1)(flags);
1256  if (fd >= 0)
1257    FdInotifyCreate(thr, pc, fd);
1258  return fd;
1259}
1260
1261TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1262  SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1263  int fd = REAL(socket)(domain, type, protocol);
1264  if (fd >= 0)
1265    FdSocketCreate(thr, pc, fd);
1266  return fd;
1267}
1268
1269TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1270  SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1271  int res = REAL(socketpair)(domain, type, protocol, fd);
1272  if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1273    FdPipeCreate(thr, pc, fd[0], fd[1]);
1274  return res;
1275}
1276
1277TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1278  SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1279  FdSocketConnecting(thr, pc, fd);
1280  int res = REAL(connect)(fd, addr, addrlen);
1281  if (res == 0 && fd >= 0)
1282    FdSocketConnect(thr, pc, fd);
1283  return res;
1284}
1285
1286TSAN_INTERCEPTOR(int, accept, int fd, void *addr, unsigned *addrlen) {
1287  SCOPED_TSAN_INTERCEPTOR(accept, fd, addr, addrlen);
1288  int fd2 = REAL(accept)(fd, addr, addrlen);
1289  if (fd >= 0 && fd2 >= 0)
1290    FdSocketAccept(thr, pc, fd, fd2);
1291  return fd2;
1292}
1293
1294TSAN_INTERCEPTOR(int, accept4, int fd, void *addr, unsigned *addrlen, int f) {
1295  SCOPED_TSAN_INTERCEPTOR(accept4, fd, addr, addrlen, f);
1296  int fd2 = REAL(accept4)(fd, addr, addrlen, f);
1297  if (fd >= 0 && fd2 >= 0)
1298    FdSocketAccept(thr, pc, fd, fd2);
1299  return fd2;
1300}
1301
1302TSAN_INTERCEPTOR(int, epoll_create, int size) {
1303  SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1304  int fd = REAL(epoll_create)(size);
1305  if (fd >= 0)
1306    FdPollCreate(thr, pc, fd);
1307  return fd;
1308}
1309
1310TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1311  SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1312  int fd = REAL(epoll_create1)(flags);
1313  if (fd >= 0)
1314    FdPollCreate(thr, pc, fd);
1315  return fd;
1316}
1317
1318TSAN_INTERCEPTOR(int, close, int fd) {
1319  SCOPED_TSAN_INTERCEPTOR(close, fd);
1320  if (fd >= 0)
1321    FdClose(thr, pc, fd);
1322  return REAL(close)(fd);
1323}
1324
1325TSAN_INTERCEPTOR(int, __close, int fd) {
1326  SCOPED_TSAN_INTERCEPTOR(__close, fd);
1327  if (fd >= 0)
1328    FdClose(thr, pc, fd);
1329  return REAL(__close)(fd);
1330}
1331
1332TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1333  SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1334  int res = REAL(pipe)(pipefd);
1335  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1336    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1337  return res;
1338}
1339
1340TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1341  SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1342  int res = REAL(pipe2)(pipefd, flags);
1343  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1344    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1345  return res;
1346}
1347
1348TSAN_INTERCEPTOR(long_t, readv, int fd, void *vec, int cnt) {
1349  SCOPED_TSAN_INTERCEPTOR(readv, fd, vec, cnt);
1350  int res = REAL(readv)(fd, vec, cnt);
1351  if (res >= 0 && fd >= 0) {
1352    FdAcquire(thr, pc, fd);
1353  }
1354  return res;
1355}
1356
1357TSAN_INTERCEPTOR(long_t, preadv64, int fd, void *vec, int cnt, u64 off) {
1358  SCOPED_TSAN_INTERCEPTOR(preadv64, fd, vec, cnt, off);
1359  int res = REAL(preadv64)(fd, vec, cnt, off);
1360  if (res >= 0 && fd >= 0) {
1361    FdAcquire(thr, pc, fd);
1362  }
1363  return res;
1364}
1365
1366TSAN_INTERCEPTOR(long_t, writev, int fd, void *vec, int cnt) {
1367  SCOPED_TSAN_INTERCEPTOR(writev, fd, vec, cnt);
1368  if (fd >= 0)
1369    FdRelease(thr, pc, fd);
1370  int res = REAL(writev)(fd, vec, cnt);
1371  return res;
1372}
1373
1374TSAN_INTERCEPTOR(long_t, pwritev64, int fd, void *vec, int cnt, u64 off) {
1375  SCOPED_TSAN_INTERCEPTOR(pwritev64, fd, vec, cnt, off);
1376  if (fd >= 0)
1377    FdRelease(thr, pc, fd);
1378  int res = REAL(pwritev64)(fd, vec, cnt, off);
1379  return res;
1380}
1381
1382TSAN_INTERCEPTOR(long_t, send, int fd, void *buf, long_t len, int flags) {
1383  SCOPED_TSAN_INTERCEPTOR(send, fd, buf, len, flags);
1384  if (fd >= 0)
1385    FdRelease(thr, pc, fd);
1386  int res = REAL(send)(fd, buf, len, flags);
1387  return res;
1388}
1389
1390TSAN_INTERCEPTOR(long_t, sendmsg, int fd, void *msg, int flags) {
1391  SCOPED_TSAN_INTERCEPTOR(sendmsg, fd, msg, flags);
1392  if (fd >= 0)
1393    FdRelease(thr, pc, fd);
1394  int res = REAL(sendmsg)(fd, msg, flags);
1395  return res;
1396}
1397
1398TSAN_INTERCEPTOR(long_t, recv, int fd, void *buf, long_t len, int flags) {
1399  SCOPED_TSAN_INTERCEPTOR(recv, fd, buf, len, flags);
1400  int res = REAL(recv)(fd, buf, len, flags);
1401  if (res >= 0 && fd >= 0) {
1402    FdAcquire(thr, pc, fd);
1403  }
1404  return res;
1405}
1406
1407TSAN_INTERCEPTOR(long_t, recvmsg, int fd, void *msg, int flags) {
1408  SCOPED_TSAN_INTERCEPTOR(recvmsg, fd, msg, flags);
1409  int res = REAL(recvmsg)(fd, msg, flags);
1410  if (res >= 0 && fd >= 0) {
1411    FdAcquire(thr, pc, fd);
1412  }
1413  return res;
1414}
1415
1416TSAN_INTERCEPTOR(int, unlink, char *path) {
1417  SCOPED_TSAN_INTERCEPTOR(unlink, path);
1418  Release(thr, pc, File2addr(path));
1419  int res = REAL(unlink)(path);
1420  return res;
1421}
1422
1423TSAN_INTERCEPTOR(void*, fopen, char *path, char *mode) {
1424  SCOPED_TSAN_INTERCEPTOR(fopen, path, mode);
1425  void *res = REAL(fopen)(path, mode);
1426  Acquire(thr, pc, File2addr(path));
1427  if (res) {
1428    int fd = fileno_unlocked(res);
1429    if (fd >= 0)
1430      FdFileCreate(thr, pc, fd);
1431  }
1432  return res;
1433}
1434
1435TSAN_INTERCEPTOR(void*, freopen, char *path, char *mode, void *stream) {
1436  SCOPED_TSAN_INTERCEPTOR(freopen, path, mode, stream);
1437  if (stream) {
1438    int fd = fileno_unlocked(stream);
1439    if (fd >= 0)
1440      FdClose(thr, pc, fd);
1441  }
1442  void *res = REAL(freopen)(path, mode, stream);
1443  Acquire(thr, pc, File2addr(path));
1444  if (res) {
1445    int fd = fileno_unlocked(res);
1446    if (fd >= 0)
1447      FdFileCreate(thr, pc, fd);
1448  }
1449  return res;
1450}
1451
1452TSAN_INTERCEPTOR(int, fclose, void *stream) {
1453  {
1454    SCOPED_TSAN_INTERCEPTOR(fclose, stream);
1455    if (stream) {
1456      int fd = fileno_unlocked(stream);
1457      if (fd >= 0)
1458        FdClose(thr, pc, fd);
1459    }
1460  }
1461  return REAL(fclose)(stream);
1462}
1463
1464TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1465  {
1466    SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1467    MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1468  }
1469  return REAL(fread)(ptr, size, nmemb, f);
1470}
1471
1472TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1473  {
1474    SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1475    MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1476  }
1477  return REAL(fwrite)(p, size, nmemb, f);
1478}
1479
1480TSAN_INTERCEPTOR(int, puts, const char *s) {
1481  SCOPED_TSAN_INTERCEPTOR(puts, s);
1482  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1483  return REAL(puts)(s);
1484}
1485
1486TSAN_INTERCEPTOR(int, rmdir, char *path) {
1487  SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1488  Release(thr, pc, Dir2addr(path));
1489  int res = REAL(rmdir)(path);
1490  return res;
1491}
1492
1493TSAN_INTERCEPTOR(void*, opendir, char *path) {
1494  SCOPED_TSAN_INTERCEPTOR(opendir, path);
1495  void *res = REAL(opendir)(path);
1496  if (res != 0)
1497    Acquire(thr, pc, Dir2addr(path));
1498  return res;
1499}
1500
1501TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1502  SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1503  if (op == EPOLL_CTL_ADD && epfd >= 0) {
1504    FdRelease(thr, pc, epfd);
1505  }
1506  int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1507  if (fd >= 0)
1508    FdAccess(thr, pc, fd);
1509  return res;
1510}
1511
1512TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1513  SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1514  int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1515  if (res > 0 && epfd >= 0) {
1516    FdAcquire(thr, pc, epfd);
1517  }
1518  return res;
1519}
1520
1521TSAN_INTERCEPTOR(int, poll, void *fds, long_t nfds, int timeout) {
1522  SCOPED_TSAN_INTERCEPTOR(poll, fds, nfds, timeout);
1523  int res = BLOCK_REAL(poll)(fds, nfds, timeout);
1524  return res;
1525}
1526
1527static void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1528    my_siginfo_t *info, void *ctx) {
1529  ThreadState *thr = cur_thread();
1530  SignalContext *sctx = SigCtx(thr);
1531  // Don't mess with synchronous signals.
1532  if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1533      sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE ||
1534      // If we are sending signal to ourselves, we must process it now.
1535      (sctx && sig == sctx->int_signal_send) ||
1536      // If we are in blocking function, we can safely process it now
1537      // (but check if we are in a recursive interceptor,
1538      // i.e. pthread_join()->munmap()).
1539      (sctx && sctx->in_blocking_func == 1 && thr->in_rtl == 1)) {
1540    CHECK(thr->in_rtl == 0 || thr->in_rtl == 1);
1541    int in_rtl = thr->in_rtl;
1542    thr->in_rtl = 0;
1543    CHECK_EQ(thr->in_signal_handler, false);
1544    thr->in_signal_handler = true;
1545    if (sigact)
1546      sigactions[sig].sa_sigaction(sig, info, ctx);
1547    else
1548      sigactions[sig].sa_handler(sig);
1549    CHECK_EQ(thr->in_signal_handler, true);
1550    thr->in_signal_handler = false;
1551    thr->in_rtl = in_rtl;
1552    return;
1553  }
1554
1555  if (sctx == 0)
1556    return;
1557  SignalDesc *signal = &sctx->pending_signals[sig];
1558  if (signal->armed == false) {
1559    signal->armed = true;
1560    signal->sigaction = sigact;
1561    if (info)
1562      internal_memcpy(&signal->siginfo, info, sizeof(*info));
1563    if (ctx)
1564      internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1565    sctx->pending_signal_count++;
1566  }
1567}
1568
1569static void rtl_sighandler(int sig) {
1570  rtl_generic_sighandler(false, sig, 0, 0);
1571}
1572
1573static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1574  rtl_generic_sighandler(true, sig, info, ctx);
1575}
1576
1577TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1578  SCOPED_TSAN_INTERCEPTOR(sigaction, sig, act, old);
1579  if (old)
1580    internal_memcpy(old, &sigactions[sig], sizeof(*old));
1581  if (act == 0)
1582    return 0;
1583  internal_memcpy(&sigactions[sig], act, sizeof(*act));
1584  sigaction_t newact;
1585  internal_memcpy(&newact, act, sizeof(newact));
1586  sigfillset(&newact.sa_mask);
1587  if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1588    if (newact.sa_flags & SA_SIGINFO)
1589      newact.sa_sigaction = rtl_sigaction;
1590    else
1591      newact.sa_handler = rtl_sighandler;
1592  }
1593  int res = REAL(sigaction)(sig, &newact, 0);
1594  return res;
1595}
1596
1597TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1598  sigaction_t act;
1599  act.sa_handler = h;
1600  REAL(memset)(&act.sa_mask, -1, sizeof(act.sa_mask));
1601  act.sa_flags = 0;
1602  sigaction_t old;
1603  int res = sigaction(sig, &act, &old);
1604  if (res)
1605    return SIG_ERR;
1606  return old.sa_handler;
1607}
1608
1609TSAN_INTERCEPTOR(int, raise, int sig) {
1610  SCOPED_TSAN_INTERCEPTOR(raise, sig);
1611  SignalContext *sctx = SigCtx(thr);
1612  CHECK_NE(sctx, 0);
1613  int prev = sctx->int_signal_send;
1614  sctx->int_signal_send = sig;
1615  int res = REAL(raise)(sig);
1616  CHECK_EQ(sctx->int_signal_send, sig);
1617  sctx->int_signal_send = prev;
1618  return res;
1619}
1620
1621TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1622  SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1623  SignalContext *sctx = SigCtx(thr);
1624  CHECK_NE(sctx, 0);
1625  int prev = sctx->int_signal_send;
1626  if (pid == GetPid()) {
1627    sctx->int_signal_send = sig;
1628  }
1629  int res = REAL(kill)(pid, sig);
1630  if (pid == GetPid()) {
1631    CHECK_EQ(sctx->int_signal_send, sig);
1632    sctx->int_signal_send = prev;
1633  }
1634  return res;
1635}
1636
1637TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1638  SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1639  SignalContext *sctx = SigCtx(thr);
1640  CHECK_NE(sctx, 0);
1641  int prev = sctx->int_signal_send;
1642  if (tid == pthread_self()) {
1643    sctx->int_signal_send = sig;
1644  }
1645  int res = REAL(pthread_kill)(tid, sig);
1646  if (tid == pthread_self()) {
1647    CHECK_EQ(sctx->int_signal_send, sig);
1648    sctx->int_signal_send = prev;
1649  }
1650  return res;
1651}
1652
1653TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
1654  SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
1655  // It's intercepted merely to process pending signals.
1656  return REAL(gettimeofday)(tv, tz);
1657}
1658
1659// Linux kernel has a bug that leads to kernel deadlock if a process
1660// maps TBs of memory and then calls mlock().
1661static void MlockIsUnsupported() {
1662  static atomic_uint8_t printed;
1663  if (atomic_exchange(&printed, 1, memory_order_relaxed))
1664    return;
1665  Printf("INFO: ThreadSanitizer ignores mlock/mlockall/munlock/munlockall\n");
1666}
1667
1668TSAN_INTERCEPTOR(int, mlock, const void *addr, uptr len) {
1669  MlockIsUnsupported();
1670  return 0;
1671}
1672
1673TSAN_INTERCEPTOR(int, munlock, const void *addr, uptr len) {
1674  MlockIsUnsupported();
1675  return 0;
1676}
1677
1678TSAN_INTERCEPTOR(int, mlockall, int flags) {
1679  MlockIsUnsupported();
1680  return 0;
1681}
1682
1683TSAN_INTERCEPTOR(int, munlockall, void) {
1684  MlockIsUnsupported();
1685  return 0;
1686}
1687
1688TSAN_INTERCEPTOR(int, fork, int fake) {
1689  SCOPED_TSAN_INTERCEPTOR(fork, fake);
1690  // It's intercepted merely to process pending signals.
1691  int pid = REAL(fork)(fake);
1692  if (pid == 0) {
1693    // child
1694    FdOnFork(thr, pc);
1695  } else if (pid > 0) {
1696    // parent
1697  }
1698  return pid;
1699}
1700
1701struct TsanInterceptorContext {
1702  ThreadState *thr;
1703  const uptr caller_pc;
1704  const uptr pc;
1705};
1706
1707#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
1708    MemoryAccessRange(((TsanInterceptorContext*)ctx)->thr,  \
1709                      ((TsanInterceptorContext*)ctx)->pc,   \
1710                      (uptr)ptr, size, true)
1711#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size)       \
1712    MemoryAccessRange(((TsanInterceptorContext*)ctx)->thr,  \
1713                      ((TsanInterceptorContext*)ctx)->pc,   \
1714                      (uptr)ptr, size, false)
1715#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
1716    SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__) \
1717    TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
1718    ctx = (void*)&_ctx; \
1719    (void)ctx;
1720#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1721    FdAcquire(((TsanInterceptorContext*)ctx)->thr, pc, fd)
1722#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1723    FdRelease(((TsanInterceptorContext*)ctx)->thr, pc, fd)
1724#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1725    ThreadSetName(((TsanInterceptorContext*)ctx)->thr, name)
1726#include "sanitizer_common/sanitizer_common_interceptors.inc"
1727
1728namespace __tsan {
1729
1730void ProcessPendingSignals(ThreadState *thr) {
1731  CHECK_EQ(thr->in_rtl, 0);
1732  SignalContext *sctx = SigCtx(thr);
1733  if (sctx == 0 || sctx->pending_signal_count == 0 || thr->in_signal_handler)
1734    return;
1735  Context *ctx = CTX();
1736  thr->in_signal_handler = true;
1737  sctx->pending_signal_count = 0;
1738  // These are too big for stack.
1739  static THREADLOCAL sigset_t emptyset, oldset;
1740  sigfillset(&emptyset);
1741  pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
1742  for (int sig = 0; sig < kSigCount; sig++) {
1743    SignalDesc *signal = &sctx->pending_signals[sig];
1744    if (signal->armed) {
1745      signal->armed = false;
1746      if (sigactions[sig].sa_handler != SIG_DFL
1747          && sigactions[sig].sa_handler != SIG_IGN) {
1748        // Insure that the handler does not spoil errno.
1749        const int saved_errno = errno;
1750        errno = 0;
1751        if (signal->sigaction)
1752          sigactions[sig].sa_sigaction(sig, &signal->siginfo, &signal->ctx);
1753        else
1754          sigactions[sig].sa_handler(sig);
1755        if (flags()->report_bugs && errno != 0) {
1756          ScopedInRtl in_rtl;
1757          __tsan::StackTrace stack;
1758          uptr pc = signal->sigaction ?
1759              (uptr)sigactions[sig].sa_sigaction :
1760              (uptr)sigactions[sig].sa_handler;
1761          stack.Init(&pc, 1);
1762          Lock l(&ctx->thread_mtx);
1763          ScopedReport rep(ReportTypeErrnoInSignal);
1764          if (!IsFiredSuppression(ctx, rep, stack)) {
1765            rep.AddStack(&stack);
1766            OutputReport(ctx, rep, rep.GetReport()->stacks[0]);
1767          }
1768        }
1769        errno = saved_errno;
1770      }
1771    }
1772  }
1773  pthread_sigmask(SIG_SETMASK, &oldset, 0);
1774  CHECK_EQ(thr->in_signal_handler, true);
1775  thr->in_signal_handler = false;
1776}
1777
1778static void unreachable() {
1779  Printf("FATAL: ThreadSanitizer: unreachable called\n");
1780  Die();
1781}
1782
1783void InitializeInterceptors() {
1784  CHECK_GT(cur_thread()->in_rtl, 0);
1785
1786  // We need to setup it early, because functions like dlsym() can call it.
1787  REAL(memset) = internal_memset;
1788  REAL(memcpy) = internal_memcpy;
1789  REAL(memcmp) = internal_memcmp;
1790
1791  SANITIZER_COMMON_INTERCEPTORS_INIT;
1792
1793  TSAN_INTERCEPT(longjmp);
1794  TSAN_INTERCEPT(siglongjmp);
1795
1796  TSAN_INTERCEPT(malloc);
1797  TSAN_INTERCEPT(__libc_memalign);
1798  TSAN_INTERCEPT(calloc);
1799  TSAN_INTERCEPT(realloc);
1800  TSAN_INTERCEPT(free);
1801  TSAN_INTERCEPT(cfree);
1802  TSAN_INTERCEPT(mmap);
1803  TSAN_INTERCEPT(mmap64);
1804  TSAN_INTERCEPT(munmap);
1805  TSAN_INTERCEPT(memalign);
1806  TSAN_INTERCEPT(valloc);
1807  TSAN_INTERCEPT(pvalloc);
1808  TSAN_INTERCEPT(posix_memalign);
1809
1810  TSAN_INTERCEPT(strlen);
1811  TSAN_INTERCEPT(memset);
1812  TSAN_INTERCEPT(memcpy);
1813  TSAN_INTERCEPT(strcmp);
1814  TSAN_INTERCEPT(memchr);
1815  TSAN_INTERCEPT(memrchr);
1816  TSAN_INTERCEPT(memmove);
1817  TSAN_INTERCEPT(memcmp);
1818  TSAN_INTERCEPT(strchr);
1819  TSAN_INTERCEPT(strchrnul);
1820  TSAN_INTERCEPT(strrchr);
1821  TSAN_INTERCEPT(strncmp);
1822  TSAN_INTERCEPT(strcpy);  // NOLINT
1823  TSAN_INTERCEPT(strncpy);
1824  TSAN_INTERCEPT(strstr);
1825
1826  TSAN_INTERCEPT(pthread_create);
1827  TSAN_INTERCEPT(pthread_join);
1828  TSAN_INTERCEPT(pthread_detach);
1829
1830  TSAN_INTERCEPT(pthread_mutex_init);
1831  TSAN_INTERCEPT(pthread_mutex_destroy);
1832  TSAN_INTERCEPT(pthread_mutex_lock);
1833  TSAN_INTERCEPT(pthread_mutex_trylock);
1834  TSAN_INTERCEPT(pthread_mutex_timedlock);
1835  TSAN_INTERCEPT(pthread_mutex_unlock);
1836
1837  TSAN_INTERCEPT(pthread_spin_init);
1838  TSAN_INTERCEPT(pthread_spin_destroy);
1839  TSAN_INTERCEPT(pthread_spin_lock);
1840  TSAN_INTERCEPT(pthread_spin_trylock);
1841  TSAN_INTERCEPT(pthread_spin_unlock);
1842
1843  TSAN_INTERCEPT(pthread_rwlock_init);
1844  TSAN_INTERCEPT(pthread_rwlock_destroy);
1845  TSAN_INTERCEPT(pthread_rwlock_rdlock);
1846  TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
1847  TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
1848  TSAN_INTERCEPT(pthread_rwlock_wrlock);
1849  TSAN_INTERCEPT(pthread_rwlock_trywrlock);
1850  TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
1851  TSAN_INTERCEPT(pthread_rwlock_unlock);
1852
1853  // TSAN_INTERCEPT(pthread_cond_init);
1854  TSAN_INTERCEPT(pthread_cond_destroy);
1855  TSAN_INTERCEPT(pthread_cond_signal);
1856  TSAN_INTERCEPT(pthread_cond_broadcast);
1857  TSAN_INTERCEPT(pthread_cond_wait);
1858  TSAN_INTERCEPT(pthread_cond_timedwait);
1859
1860  TSAN_INTERCEPT(pthread_barrier_init);
1861  TSAN_INTERCEPT(pthread_barrier_destroy);
1862  TSAN_INTERCEPT(pthread_barrier_wait);
1863
1864  TSAN_INTERCEPT(pthread_once);
1865
1866  TSAN_INTERCEPT(sem_init);
1867  TSAN_INTERCEPT(sem_destroy);
1868  TSAN_INTERCEPT(sem_wait);
1869  TSAN_INTERCEPT(sem_trywait);
1870  TSAN_INTERCEPT(sem_timedwait);
1871  TSAN_INTERCEPT(sem_post);
1872  TSAN_INTERCEPT(sem_getvalue);
1873
1874  TSAN_INTERCEPT(stat);
1875  TSAN_INTERCEPT(__xstat);
1876  TSAN_INTERCEPT(stat64);
1877  TSAN_INTERCEPT(__xstat64);
1878  TSAN_INTERCEPT(lstat);
1879  TSAN_INTERCEPT(__lxstat);
1880  TSAN_INTERCEPT(lstat64);
1881  TSAN_INTERCEPT(__lxstat64);
1882  TSAN_INTERCEPT(fstat);
1883  TSAN_INTERCEPT(__fxstat);
1884  TSAN_INTERCEPT(fstat64);
1885  TSAN_INTERCEPT(__fxstat64);
1886  TSAN_INTERCEPT(open);
1887  TSAN_INTERCEPT(open64);
1888  TSAN_INTERCEPT(creat);
1889  TSAN_INTERCEPT(creat64);
1890  TSAN_INTERCEPT(dup);
1891  TSAN_INTERCEPT(dup2);
1892  TSAN_INTERCEPT(dup3);
1893  TSAN_INTERCEPT(eventfd);
1894  TSAN_INTERCEPT(signalfd);
1895  TSAN_INTERCEPT(inotify_init);
1896  TSAN_INTERCEPT(inotify_init1);
1897  TSAN_INTERCEPT(socket);
1898  TSAN_INTERCEPT(socketpair);
1899  TSAN_INTERCEPT(connect);
1900  TSAN_INTERCEPT(accept);
1901  TSAN_INTERCEPT(accept4);
1902  TSAN_INTERCEPT(epoll_create);
1903  TSAN_INTERCEPT(epoll_create1);
1904  TSAN_INTERCEPT(close);
1905  TSAN_INTERCEPT(pipe);
1906  TSAN_INTERCEPT(pipe2);
1907
1908  TSAN_INTERCEPT(readv);
1909  TSAN_INTERCEPT(preadv64);
1910  TSAN_INTERCEPT(writev);
1911  TSAN_INTERCEPT(pwritev64);
1912  TSAN_INTERCEPT(send);
1913  TSAN_INTERCEPT(sendmsg);
1914  TSAN_INTERCEPT(recv);
1915  TSAN_INTERCEPT(recvmsg);
1916
1917  TSAN_INTERCEPT(unlink);
1918  TSAN_INTERCEPT(fopen);
1919  TSAN_INTERCEPT(freopen);
1920  TSAN_INTERCEPT(fclose);
1921  TSAN_INTERCEPT(fread);
1922  TSAN_INTERCEPT(fwrite);
1923  TSAN_INTERCEPT(puts);
1924  TSAN_INTERCEPT(rmdir);
1925  TSAN_INTERCEPT(opendir);
1926
1927  TSAN_INTERCEPT(epoll_ctl);
1928  TSAN_INTERCEPT(epoll_wait);
1929  TSAN_INTERCEPT(poll);
1930
1931  TSAN_INTERCEPT(sigaction);
1932  TSAN_INTERCEPT(signal);
1933  TSAN_INTERCEPT(raise);
1934  TSAN_INTERCEPT(kill);
1935  TSAN_INTERCEPT(pthread_kill);
1936  TSAN_INTERCEPT(sleep);
1937  TSAN_INTERCEPT(usleep);
1938  TSAN_INTERCEPT(nanosleep);
1939  TSAN_INTERCEPT(gettimeofday);
1940
1941  TSAN_INTERCEPT(mlock);
1942  TSAN_INTERCEPT(munlock);
1943  TSAN_INTERCEPT(mlockall);
1944  TSAN_INTERCEPT(munlockall);
1945
1946  TSAN_INTERCEPT(fork);
1947  TSAN_INTERCEPT(on_exit);
1948  TSAN_INTERCEPT(__cxa_atexit);
1949
1950  // Need to setup it, because interceptors check that the function is resolved.
1951  // But atexit is emitted directly into the module, so can't be resolved.
1952  REAL(atexit) = (int(*)(void(*)()))unreachable;
1953  atexit_ctx = new(internal_alloc(MBlockAtExit, sizeof(AtExitContext)))
1954      AtExitContext();
1955
1956  if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
1957    Printf("ThreadSanitizer: failed to setup atexit callback\n");
1958    Die();
1959  }
1960
1961  if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
1962    Printf("ThreadSanitizer: failed to create thread key\n");
1963    Die();
1964  }
1965
1966  FdInit();
1967}
1968
1969void internal_start_thread(void(*func)(void *arg), void *arg) {
1970  void *th;
1971  REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
1972  REAL(pthread_detach)(th);
1973}
1974
1975}  // namespace __tsan
1976