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_platform_limits_posix.h"
19#include "sanitizer_common/sanitizer_placement_new.h"
20#include "sanitizer_common/sanitizer_stacktrace.h"
21#include "interception/interception.h"
22#include "tsan_interface.h"
23#include "tsan_platform.h"
24#include "tsan_rtl.h"
25#include "tsan_mman.h"
26#include "tsan_fd.h"
27
28using namespace __tsan;  // NOLINT
29
30const int kSigCount = 128;
31
32struct my_siginfo_t {
33  int opaque[128];
34};
35
36struct sigset_t {
37  u64 val[1024 / 8 / sizeof(u64)];
38};
39
40struct ucontext_t {
41  uptr opaque[117];
42};
43
44extern "C" int pthread_attr_init(void *attr);
45extern "C" int pthread_attr_destroy(void *attr);
46extern "C" int pthread_attr_getdetachstate(void *attr, int *v);
47extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
48extern "C" int pthread_attr_getstacksize(void *attr, uptr *stacksize);
49extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
50extern "C" int pthread_setspecific(unsigned key, const void *v);
51extern "C" int pthread_mutexattr_gettype(void *a, int *type);
52extern "C" int pthread_yield();
53extern "C" int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);
54extern "C" int sigfillset(sigset_t *set);
55extern "C" void *pthread_self();
56extern "C" void _exit(int status);
57extern "C" int *__errno_location();
58extern "C" int fileno_unlocked(void *stream);
59extern "C" void *__libc_malloc(uptr size);
60extern "C" void *__libc_calloc(uptr size, uptr n);
61extern "C" void *__libc_realloc(void *ptr, uptr size);
62extern "C" void __libc_free(void *ptr);
63const int PTHREAD_MUTEX_RECURSIVE = 1;
64const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
65const int kPthreadAttrSize = 56;
66const int EINVAL = 22;
67const int EBUSY = 16;
68const int EPOLL_CTL_ADD = 1;
69const int SIGILL = 4;
70const int SIGABRT = 6;
71const int SIGFPE = 8;
72const int SIGSEGV = 11;
73const int SIGPIPE = 13;
74const int SIGBUS = 7;
75void *const MAP_FAILED = (void*)-1;
76const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
77const int MAP_FIXED = 0x10;
78typedef long long_t;  // NOLINT
79
80// From /usr/include/unistd.h
81# define F_ULOCK 0      /* Unlock a previously locked region.  */
82# define F_LOCK  1      /* Lock a region for exclusive use.  */
83# define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
84# define F_TEST  3      /* Test a region for other processes locks.  */
85
86typedef void (*sighandler_t)(int sig);
87
88#define errno (*__errno_location())
89
90struct sigaction_t {
91  union {
92    sighandler_t sa_handler;
93    void (*sa_sigaction)(int sig, my_siginfo_t *siginfo, void *uctx);
94  };
95  sigset_t sa_mask;
96  int sa_flags;
97  void (*sa_restorer)();
98};
99
100const sighandler_t SIG_DFL = (sighandler_t)0;
101const sighandler_t SIG_IGN = (sighandler_t)1;
102const sighandler_t SIG_ERR = (sighandler_t)-1;
103const int SA_SIGINFO = 4;
104const int SIG_SETMASK = 2;
105
106namespace std {
107struct nothrow_t {};
108}  // namespace std
109
110static sigaction_t sigactions[kSigCount];
111
112namespace __tsan {
113struct SignalDesc {
114  bool armed;
115  bool sigaction;
116  my_siginfo_t siginfo;
117  ucontext_t ctx;
118};
119
120struct SignalContext {
121  int in_blocking_func;
122  int int_signal_send;
123  int pending_signal_count;
124  SignalDesc pending_signals[kSigCount];
125};
126}  // namespace __tsan
127
128static SignalContext *SigCtx(ThreadState *thr) {
129  SignalContext *ctx = (SignalContext*)thr->signal_ctx;
130  if (ctx == 0 && thr->is_alive) {
131    ScopedInRtl in_rtl;
132    ctx = (SignalContext*)MmapOrDie(sizeof(*ctx), "SignalContext");
133    MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
134    thr->signal_ctx = ctx;
135  }
136  return ctx;
137}
138
139static unsigned g_thread_finalize_key;
140
141class ScopedInterceptor {
142 public:
143  ScopedInterceptor(ThreadState *thr, const char *fname, uptr pc);
144  ~ScopedInterceptor();
145 private:
146  ThreadState *const thr_;
147  const int in_rtl_;
148};
149
150ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
151                                     uptr pc)
152    : thr_(thr)
153    , in_rtl_(thr->in_rtl) {
154  if (thr_->in_rtl == 0) {
155    Initialize(thr);
156    FuncEntry(thr, pc);
157    thr_->in_rtl++;
158    DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
159  } else {
160    thr_->in_rtl++;
161  }
162}
163
164ScopedInterceptor::~ScopedInterceptor() {
165  thr_->in_rtl--;
166  if (thr_->in_rtl == 0) {
167    FuncExit(thr_);
168    ProcessPendingSignals(thr_);
169  }
170  CHECK_EQ(in_rtl_, thr_->in_rtl);
171}
172
173#define SCOPED_INTERCEPTOR_RAW(func, ...) \
174    ThreadState *thr = cur_thread(); \
175    StatInc(thr, StatInterceptor); \
176    StatInc(thr, StatInt_##func); \
177    const uptr caller_pc = GET_CALLER_PC(); \
178    ScopedInterceptor si(thr, #func, caller_pc); \
179    const uptr pc = __sanitizer::StackTrace::GetPreviousInstructionPc( \
180        __sanitizer::StackTrace::GetCurrentPc()); \
181    (void)pc; \
182/**/
183
184#define SCOPED_TSAN_INTERCEPTOR(func, ...) \
185    SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
186    if (REAL(func) == 0) { \
187      Printf("FATAL: ThreadSanitizer: failed to intercept %s\n", #func); \
188      Die(); \
189    } \
190    if (thr->in_rtl > 1) \
191      return REAL(func)(__VA_ARGS__); \
192/**/
193
194#define TSAN_INTERCEPTOR(ret, func, ...) INTERCEPTOR(ret, func, __VA_ARGS__)
195#define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
196
197#define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
198
199struct BlockingCall {
200  explicit BlockingCall(ThreadState *thr)
201      : ctx(SigCtx(thr)) {
202    ctx->in_blocking_func++;
203  }
204
205  ~BlockingCall() {
206    ctx->in_blocking_func--;
207  }
208
209  SignalContext *ctx;
210};
211
212TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
213  SCOPED_TSAN_INTERCEPTOR(sleep, sec);
214  unsigned res = BLOCK_REAL(sleep)(sec);
215  AfterSleep(thr, pc);
216  return res;
217}
218
219TSAN_INTERCEPTOR(int, usleep, long_t usec) {
220  SCOPED_TSAN_INTERCEPTOR(usleep, usec);
221  int res = BLOCK_REAL(usleep)(usec);
222  AfterSleep(thr, pc);
223  return res;
224}
225
226TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
227  SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
228  int res = BLOCK_REAL(nanosleep)(req, rem);
229  AfterSleep(thr, pc);
230  return res;
231}
232
233class AtExitContext {
234 public:
235  AtExitContext()
236    : mtx_(MutexTypeAtExit, StatMtxAtExit)
237    , pos_() {
238  }
239
240  typedef void(*atexit_t)();
241
242  int atexit(ThreadState *thr, uptr pc, bool is_on_exit,
243             atexit_t f, void *arg) {
244    Lock l(&mtx_);
245    if (pos_ == kMaxAtExit)
246      return 1;
247    Release(thr, pc, (uptr)this);
248    stack_[pos_] = f;
249    args_[pos_] = arg;
250    is_on_exits_[pos_] = is_on_exit;
251    pos_++;
252    return 0;
253  }
254
255  void exit(ThreadState *thr, uptr pc) {
256    CHECK_EQ(thr->in_rtl, 0);
257    for (;;) {
258      atexit_t f = 0;
259      void *arg = 0;
260      bool is_on_exit = false;
261      {
262        Lock l(&mtx_);
263        if (pos_) {
264          pos_--;
265          f = stack_[pos_];
266          arg = args_[pos_];
267          is_on_exit = is_on_exits_[pos_];
268          ScopedInRtl in_rtl;
269          Acquire(thr, pc, (uptr)this);
270        }
271      }
272      if (f == 0)
273        break;
274      DPrintf("#%d: executing atexit func %p\n", thr->tid, f);
275      CHECK_EQ(thr->in_rtl, 0);
276      if (is_on_exit)
277        ((void(*)(int status, void *arg))f)(0, arg);
278      else
279        ((void(*)(void *arg, void *dso))f)(arg, 0);
280    }
281  }
282
283 private:
284  static const int kMaxAtExit = 128;
285  Mutex mtx_;
286  atexit_t stack_[kMaxAtExit];
287  void *args_[kMaxAtExit];
288  bool is_on_exits_[kMaxAtExit];
289  int pos_;
290};
291
292static AtExitContext *atexit_ctx;
293
294static void finalize(void *arg) {
295  ThreadState * thr = cur_thread();
296  uptr pc = 0;
297  atexit_ctx->exit(thr, pc);
298  int status = Finalize(cur_thread());
299  if (status)
300    _exit(status);
301}
302
303TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
304  if (cur_thread()->in_symbolizer)
305    return 0;
306  SCOPED_TSAN_INTERCEPTOR(atexit, f);
307  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, 0);
308}
309
310TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
311  if (cur_thread()->in_symbolizer)
312    return 0;
313  SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
314  return atexit_ctx->atexit(thr, pc, true, (void(*)())f, arg);
315}
316
317TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {
318  if (cur_thread()->in_symbolizer)
319    return 0;
320  SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
321  if (dso)
322    return REAL(__cxa_atexit)(f, arg, dso);
323  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, arg);
324}
325
326TSAN_INTERCEPTOR(void, longjmp, void *env, int val) {
327  SCOPED_TSAN_INTERCEPTOR(longjmp, env, val);
328  Printf("ThreadSanitizer: longjmp() is not supported\n");
329  Die();
330}
331
332TSAN_INTERCEPTOR(void, siglongjmp, void *env, int val) {
333  SCOPED_TSAN_INTERCEPTOR(siglongjmp, env, val);
334  Printf("ThreadSanitizer: siglongjmp() is not supported\n");
335  Die();
336}
337
338TSAN_INTERCEPTOR(void*, malloc, uptr size) {
339  if (cur_thread()->in_symbolizer)
340    return __libc_malloc(size);
341  void *p = 0;
342  {
343    SCOPED_INTERCEPTOR_RAW(malloc, size);
344    p = user_alloc(thr, pc, size);
345  }
346  invoke_malloc_hook(p, size);
347  return p;
348}
349
350TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
351  SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
352  return user_alloc(thr, pc, sz, align);
353}
354
355TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
356  if (cur_thread()->in_symbolizer)
357    return __libc_calloc(size, n);
358  if (__sanitizer::CallocShouldReturnNullDueToOverflow(size, n)) return 0;
359  void *p = 0;
360  {
361    SCOPED_INTERCEPTOR_RAW(calloc, size, n);
362    p = user_alloc(thr, pc, n * size);
363    if (p) internal_memset(p, 0, n * size);
364  }
365  invoke_malloc_hook(p, n * size);
366  return p;
367}
368
369TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
370  if (cur_thread()->in_symbolizer)
371    return __libc_realloc(p, size);
372  if (p)
373    invoke_free_hook(p);
374  {
375    SCOPED_INTERCEPTOR_RAW(realloc, p, size);
376    p = user_realloc(thr, pc, p, size);
377  }
378  invoke_malloc_hook(p, size);
379  return p;
380}
381
382TSAN_INTERCEPTOR(void, free, void *p) {
383  if (p == 0)
384    return;
385  if (cur_thread()->in_symbolizer)
386    return __libc_free(p);
387  invoke_free_hook(p);
388  SCOPED_INTERCEPTOR_RAW(free, p);
389  user_free(thr, pc, p);
390}
391
392TSAN_INTERCEPTOR(void, cfree, void *p) {
393  if (p == 0)
394    return;
395  if (cur_thread()->in_symbolizer)
396    return __libc_free(p);
397  invoke_free_hook(p);
398  SCOPED_INTERCEPTOR_RAW(cfree, p);
399  user_free(thr, pc, p);
400}
401
402TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {
403  SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);
404  return user_alloc_usable_size(thr, pc, p);
405}
406
407#define OPERATOR_NEW_BODY(mangled_name) \
408  if (cur_thread()->in_symbolizer) \
409    return __libc_malloc(size); \
410  void *p = 0; \
411  {  \
412    SCOPED_INTERCEPTOR_RAW(mangled_name, size); \
413    p = user_alloc(thr, pc, size); \
414  }  \
415  invoke_malloc_hook(p, size);  \
416  return p;
417
418void *operator new(__sanitizer::uptr size) {
419  OPERATOR_NEW_BODY(_Znwm);
420}
421void *operator new[](__sanitizer::uptr size) {
422  OPERATOR_NEW_BODY(_Znam);
423}
424void *operator new(__sanitizer::uptr size, std::nothrow_t const&) {
425  OPERATOR_NEW_BODY(_ZnwmRKSt9nothrow_t);
426}
427void *operator new[](__sanitizer::uptr size, std::nothrow_t const&) {
428  OPERATOR_NEW_BODY(_ZnamRKSt9nothrow_t);
429}
430
431#define OPERATOR_DELETE_BODY(mangled_name) \
432  if (ptr == 0) return;  \
433  if (cur_thread()->in_symbolizer) \
434    return __libc_free(ptr); \
435  invoke_free_hook(ptr);  \
436  SCOPED_INTERCEPTOR_RAW(mangled_name, ptr);  \
437  user_free(thr, pc, ptr);
438
439void operator delete(void *ptr) {
440  OPERATOR_DELETE_BODY(_ZdlPv);
441}
442void operator delete[](void *ptr) {
443  OPERATOR_DELETE_BODY(_ZdlPvRKSt9nothrow_t);
444}
445void operator delete(void *ptr, std::nothrow_t const&) {
446  OPERATOR_DELETE_BODY(_ZdaPv);
447}
448void operator delete[](void *ptr, std::nothrow_t const&) {
449  OPERATOR_DELETE_BODY(_ZdaPvRKSt9nothrow_t);
450}
451
452TSAN_INTERCEPTOR(uptr, strlen, const char *s) {
453  SCOPED_TSAN_INTERCEPTOR(strlen, s);
454  uptr len = internal_strlen(s);
455  MemoryAccessRange(thr, pc, (uptr)s, len + 1, false);
456  return len;
457}
458
459TSAN_INTERCEPTOR(void*, memset, void *dst, int v, uptr size) {
460  SCOPED_TSAN_INTERCEPTOR(memset, dst, v, size);
461  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
462  return internal_memset(dst, v, size);
463}
464
465TSAN_INTERCEPTOR(void*, memcpy, void *dst, const void *src, uptr size) {
466  SCOPED_TSAN_INTERCEPTOR(memcpy, dst, src, size);
467  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
468  MemoryAccessRange(thr, pc, (uptr)src, size, false);
469  return internal_memcpy(dst, src, size);
470}
471
472TSAN_INTERCEPTOR(int, memcmp, const void *s1, const void *s2, uptr n) {
473  SCOPED_TSAN_INTERCEPTOR(memcmp, s1, s2, n);
474  int res = 0;
475  uptr len = 0;
476  for (; len < n; len++) {
477    if ((res = ((unsigned char*)s1)[len] - ((unsigned char*)s2)[len]))
478      break;
479  }
480  MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
481  MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
482  return res;
483}
484
485TSAN_INTERCEPTOR(int, strcmp, const char *s1, const char *s2) {
486  SCOPED_TSAN_INTERCEPTOR(strcmp, s1, s2);
487  uptr len = 0;
488  for (; s1[len] && s2[len]; len++) {
489    if (s1[len] != s2[len])
490      break;
491  }
492  MemoryAccessRange(thr, pc, (uptr)s1, len + 1, false);
493  MemoryAccessRange(thr, pc, (uptr)s2, len + 1, false);
494  return s1[len] - s2[len];
495}
496
497TSAN_INTERCEPTOR(int, strncmp, const char *s1, const char *s2, uptr n) {
498  SCOPED_TSAN_INTERCEPTOR(strncmp, s1, s2, n);
499  uptr len = 0;
500  for (; len < n && s1[len] && s2[len]; len++) {
501    if (s1[len] != s2[len])
502      break;
503  }
504  MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
505  MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
506  return len == n ? 0 : s1[len] - s2[len];
507}
508
509TSAN_INTERCEPTOR(void*, memchr, void *s, int c, uptr n) {
510  SCOPED_TSAN_INTERCEPTOR(memchr, s, c, n);
511  void *res = REAL(memchr)(s, c, n);
512  uptr len = res ? (char*)res - (char*)s + 1 : n;
513  MemoryAccessRange(thr, pc, (uptr)s, len, false);
514  return res;
515}
516
517TSAN_INTERCEPTOR(void*, memrchr, char *s, int c, uptr n) {
518  SCOPED_TSAN_INTERCEPTOR(memrchr, s, c, n);
519  MemoryAccessRange(thr, pc, (uptr)s, n, false);
520  return REAL(memrchr)(s, c, n);
521}
522
523TSAN_INTERCEPTOR(void*, memmove, void *dst, void *src, uptr n) {
524  SCOPED_TSAN_INTERCEPTOR(memmove, dst, src, n);
525  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
526  MemoryAccessRange(thr, pc, (uptr)src, n, false);
527  return REAL(memmove)(dst, src, n);
528}
529
530TSAN_INTERCEPTOR(char*, strchr, char *s, int c) {
531  SCOPED_TSAN_INTERCEPTOR(strchr, s, c);
532  char *res = REAL(strchr)(s, c);
533  uptr len = res ? (char*)res - (char*)s + 1 : internal_strlen(s) + 1;
534  MemoryAccessRange(thr, pc, (uptr)s, len, false);
535  return res;
536}
537
538TSAN_INTERCEPTOR(char*, strchrnul, char *s, int c) {
539  SCOPED_TSAN_INTERCEPTOR(strchrnul, s, c);
540  char *res = REAL(strchrnul)(s, c);
541  uptr len = (char*)res - (char*)s + 1;
542  MemoryAccessRange(thr, pc, (uptr)s, len, false);
543  return res;
544}
545
546TSAN_INTERCEPTOR(char*, strrchr, char *s, int c) {
547  SCOPED_TSAN_INTERCEPTOR(strrchr, s, c);
548  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s) + 1, false);
549  return REAL(strrchr)(s, c);
550}
551
552TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) {  // NOLINT
553  SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);  // NOLINT
554  uptr srclen = internal_strlen(src);
555  MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
556  MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
557  return REAL(strcpy)(dst, src);  // NOLINT
558}
559
560TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
561  SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
562  uptr srclen = internal_strnlen(src, n);
563  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
564  MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
565  return REAL(strncpy)(dst, src, n);
566}
567
568TSAN_INTERCEPTOR(const char*, strstr, const char *s1, const char *s2) {
569  SCOPED_TSAN_INTERCEPTOR(strstr, s1, s2);
570  const char *res = REAL(strstr)(s1, s2);
571  uptr len1 = internal_strlen(s1);
572  uptr len2 = internal_strlen(s2);
573  MemoryAccessRange(thr, pc, (uptr)s1, len1 + 1, false);
574  MemoryAccessRange(thr, pc, (uptr)s2, len2 + 1, false);
575  return res;
576}
577
578static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
579  if (*addr) {
580    if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
581      if (flags & MAP_FIXED) {
582        errno = EINVAL;
583        return false;
584      } else {
585        *addr = 0;
586      }
587    }
588  }
589  return true;
590}
591
592TSAN_INTERCEPTOR(void*, mmap, void *addr, long_t sz, int prot,
593                         int flags, int fd, unsigned off) {
594  SCOPED_TSAN_INTERCEPTOR(mmap, addr, sz, prot, flags, fd, off);
595  if (!fix_mmap_addr(&addr, sz, flags))
596    return MAP_FAILED;
597  void *res = REAL(mmap)(addr, sz, prot, flags, fd, off);
598  if (res != MAP_FAILED) {
599    if (fd > 0)
600      FdAccess(thr, pc, fd);
601    MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
602  }
603  return res;
604}
605
606TSAN_INTERCEPTOR(void*, mmap64, void *addr, long_t sz, int prot,
607                           int flags, int fd, u64 off) {
608  SCOPED_TSAN_INTERCEPTOR(mmap64, addr, sz, prot, flags, fd, off);
609  if (!fix_mmap_addr(&addr, sz, flags))
610    return MAP_FAILED;
611  void *res = REAL(mmap64)(addr, sz, prot, flags, fd, off);
612  if (res != MAP_FAILED) {
613    if (fd > 0)
614      FdAccess(thr, pc, fd);
615    MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
616  }
617  return res;
618}
619
620TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
621  SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
622  DontNeedShadowFor((uptr)addr, sz);
623  int res = REAL(munmap)(addr, sz);
624  return res;
625}
626
627TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
628  SCOPED_TSAN_INTERCEPTOR(memalign, align, sz);
629  return user_alloc(thr, pc, sz, align);
630}
631
632TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
633  SCOPED_TSAN_INTERCEPTOR(valloc, sz);
634  return user_alloc(thr, pc, sz, GetPageSizeCached());
635}
636
637TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
638  SCOPED_TSAN_INTERCEPTOR(pvalloc, sz);
639  sz = RoundUp(sz, GetPageSizeCached());
640  return user_alloc(thr, pc, sz, GetPageSizeCached());
641}
642
643TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
644  SCOPED_TSAN_INTERCEPTOR(posix_memalign, memptr, align, sz);
645  *memptr = user_alloc(thr, pc, sz, align);
646  return 0;
647}
648
649// Used in thread-safe function static initialization.
650extern "C" int INTERFACE_ATTRIBUTE __cxa_guard_acquire(atomic_uint32_t *g) {
651  SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
652  for (;;) {
653    u32 cmp = atomic_load(g, memory_order_acquire);
654    if (cmp == 0) {
655      if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
656        return 1;
657    } else if (cmp == 1) {
658      Acquire(thr, pc, (uptr)g);
659      return 0;
660    } else {
661      internal_sched_yield();
662    }
663  }
664}
665
666extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_release(atomic_uint32_t *g) {
667  SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
668  Release(thr, pc, (uptr)g);
669  atomic_store(g, 1, memory_order_release);
670}
671
672extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_abort(atomic_uint32_t *g) {
673  SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
674  atomic_store(g, 0, memory_order_relaxed);
675}
676
677static void thread_finalize(void *v) {
678  uptr iter = (uptr)v;
679  if (iter > 1) {
680    if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
681      Printf("ThreadSanitizer: failed to set thread key\n");
682      Die();
683    }
684    return;
685  }
686  {
687    ScopedInRtl in_rtl;
688    ThreadState *thr = cur_thread();
689    ThreadFinish(thr);
690    SignalContext *sctx = thr->signal_ctx;
691    if (sctx) {
692      thr->signal_ctx = 0;
693      UnmapOrDie(sctx, sizeof(*sctx));
694    }
695  }
696}
697
698
699struct ThreadParam {
700  void* (*callback)(void *arg);
701  void *param;
702  atomic_uintptr_t tid;
703};
704
705extern "C" void *__tsan_thread_start_func(void *arg) {
706  ThreadParam *p = (ThreadParam*)arg;
707  void* (*callback)(void *arg) = p->callback;
708  void *param = p->param;
709  int tid = 0;
710  {
711    ThreadState *thr = cur_thread();
712    ScopedInRtl in_rtl;
713    if (pthread_setspecific(g_thread_finalize_key, (void*)4)) {
714      Printf("ThreadSanitizer: failed to set thread key\n");
715      Die();
716    }
717    while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
718      pthread_yield();
719    atomic_store(&p->tid, 0, memory_order_release);
720    ThreadStart(thr, tid, GetTid());
721    CHECK_EQ(thr->in_rtl, 1);
722  }
723  void *res = callback(param);
724  // Prevent the callback from being tail called,
725  // it mixes up stack traces.
726  volatile int foo = 42;
727  foo++;
728  return res;
729}
730
731TSAN_INTERCEPTOR(int, pthread_create,
732    void *th, void *attr, void *(*callback)(void*), void * param) {
733  SCOPED_TSAN_INTERCEPTOR(pthread_create, th, attr, callback, param);
734  __sanitizer_pthread_attr_t myattr;
735  if (attr == 0) {
736    pthread_attr_init(&myattr);
737    attr = &myattr;
738  }
739  int detached = 0;
740  pthread_attr_getdetachstate(attr, &detached);
741  uptr stacksize = 0;
742  pthread_attr_getstacksize(attr, &stacksize);
743  // We place the huge ThreadState object into TLS, account for that.
744  const uptr minstacksize = GetTlsSize() + 128*1024;
745  if (stacksize < minstacksize) {
746    DPrintf("ThreadSanitizer: stacksize %zu->%zu\n", stacksize, minstacksize);
747    pthread_attr_setstacksize(attr, minstacksize);
748  }
749  ThreadParam p;
750  p.callback = callback;
751  p.param = param;
752  atomic_store(&p.tid, 0, memory_order_relaxed);
753  int res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
754  if (res == 0) {
755    int tid = ThreadCreate(thr, pc, *(uptr*)th, detached);
756    CHECK_NE(tid, 0);
757    atomic_store(&p.tid, tid, memory_order_release);
758    while (atomic_load(&p.tid, memory_order_acquire) != 0)
759      pthread_yield();
760  }
761  if (attr == &myattr)
762    pthread_attr_destroy(&myattr);
763  return res;
764}
765
766TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
767  SCOPED_TSAN_INTERCEPTOR(pthread_join, th, ret);
768  int tid = ThreadTid(thr, pc, (uptr)th);
769  int res = BLOCK_REAL(pthread_join)(th, ret);
770  if (res == 0) {
771    ThreadJoin(thr, pc, tid);
772  }
773  return res;
774}
775
776TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
777  SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
778  int tid = ThreadTid(thr, pc, (uptr)th);
779  int res = REAL(pthread_detach)(th);
780  if (res == 0) {
781    ThreadDetach(thr, pc, tid);
782  }
783  return res;
784}
785
786TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
787  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
788  int res = REAL(pthread_mutex_init)(m, a);
789  if (res == 0) {
790    bool recursive = false;
791    if (a) {
792      int type = 0;
793      if (pthread_mutexattr_gettype(a, &type) == 0)
794        recursive = (type == PTHREAD_MUTEX_RECURSIVE
795            || type == PTHREAD_MUTEX_RECURSIVE_NP);
796    }
797    MutexCreate(thr, pc, (uptr)m, false, recursive, false);
798  }
799  return res;
800}
801
802TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
803  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
804  int res = REAL(pthread_mutex_destroy)(m);
805  if (res == 0 || res == EBUSY) {
806    MutexDestroy(thr, pc, (uptr)m);
807  }
808  return res;
809}
810
811TSAN_INTERCEPTOR(int, pthread_mutex_lock, void *m) {
812  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_lock, m);
813  int res = REAL(pthread_mutex_lock)(m);
814  if (res == 0) {
815    MutexLock(thr, pc, (uptr)m);
816  }
817  return res;
818}
819
820TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
821  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
822  int res = REAL(pthread_mutex_trylock)(m);
823  if (res == 0) {
824    MutexLock(thr, pc, (uptr)m);
825  }
826  return res;
827}
828
829TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
830  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
831  int res = REAL(pthread_mutex_timedlock)(m, abstime);
832  if (res == 0) {
833    MutexLock(thr, pc, (uptr)m);
834  }
835  return res;
836}
837
838TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {
839  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_unlock, m);
840  MutexUnlock(thr, pc, (uptr)m);
841  int res = REAL(pthread_mutex_unlock)(m);
842  return res;
843}
844
845TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
846  SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
847  int res = REAL(pthread_spin_init)(m, pshared);
848  if (res == 0) {
849    MutexCreate(thr, pc, (uptr)m, false, false, false);
850  }
851  return res;
852}
853
854TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
855  SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
856  int res = REAL(pthread_spin_destroy)(m);
857  if (res == 0) {
858    MutexDestroy(thr, pc, (uptr)m);
859  }
860  return res;
861}
862
863TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
864  SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
865  int res = REAL(pthread_spin_lock)(m);
866  if (res == 0) {
867    MutexLock(thr, pc, (uptr)m);
868  }
869  return res;
870}
871
872TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
873  SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
874  int res = REAL(pthread_spin_trylock)(m);
875  if (res == 0) {
876    MutexLock(thr, pc, (uptr)m);
877  }
878  return res;
879}
880
881TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
882  SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
883  MutexUnlock(thr, pc, (uptr)m);
884  int res = REAL(pthread_spin_unlock)(m);
885  return res;
886}
887
888TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
889  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
890  int res = REAL(pthread_rwlock_init)(m, a);
891  if (res == 0) {
892    MutexCreate(thr, pc, (uptr)m, true, false, false);
893  }
894  return res;
895}
896
897TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
898  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
899  int res = REAL(pthread_rwlock_destroy)(m);
900  if (res == 0) {
901    MutexDestroy(thr, pc, (uptr)m);
902  }
903  return res;
904}
905
906TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
907  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
908  int res = REAL(pthread_rwlock_rdlock)(m);
909  if (res == 0) {
910    MutexReadLock(thr, pc, (uptr)m);
911  }
912  return res;
913}
914
915TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
916  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
917  int res = REAL(pthread_rwlock_tryrdlock)(m);
918  if (res == 0) {
919    MutexReadLock(thr, pc, (uptr)m);
920  }
921  return res;
922}
923
924TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
925  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
926  int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
927  if (res == 0) {
928    MutexReadLock(thr, pc, (uptr)m);
929  }
930  return res;
931}
932
933TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
934  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
935  int res = REAL(pthread_rwlock_wrlock)(m);
936  if (res == 0) {
937    MutexLock(thr, pc, (uptr)m);
938  }
939  return res;
940}
941
942TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
943  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
944  int res = REAL(pthread_rwlock_trywrlock)(m);
945  if (res == 0) {
946    MutexLock(thr, pc, (uptr)m);
947  }
948  return res;
949}
950
951TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
952  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
953  int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
954  if (res == 0) {
955    MutexLock(thr, pc, (uptr)m);
956  }
957  return res;
958}
959
960TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
961  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
962  MutexReadOrWriteUnlock(thr, pc, (uptr)m);
963  int res = REAL(pthread_rwlock_unlock)(m);
964  return res;
965}
966
967// libpthread.so contains several versions of pthread_cond_init symbol.
968// When we just dlsym() it, we get the wrong (old) version.
969/*
970TSAN_INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
971  SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, c, a);
972  int res = REAL(pthread_cond_init)(c, a);
973  return res;
974}
975*/
976
977TSAN_INTERCEPTOR(int, pthread_cond_destroy, void *c) {
978  SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, c);
979  int res = REAL(pthread_cond_destroy)(c);
980  return res;
981}
982
983TSAN_INTERCEPTOR(int, pthread_cond_signal, void *c) {
984  SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, c);
985  int res = REAL(pthread_cond_signal)(c);
986  return res;
987}
988
989TSAN_INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
990  SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, c);
991  int res = REAL(pthread_cond_broadcast)(c);
992  return res;
993}
994
995TSAN_INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
996  SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, c, m);
997  MutexUnlock(thr, pc, (uptr)m);
998  int res = REAL(pthread_cond_wait)(c, m);
999  MutexLock(thr, pc, (uptr)m);
1000  return res;
1001}
1002
1003TSAN_INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m, void *abstime) {
1004  SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, c, m, abstime);
1005  MutexUnlock(thr, pc, (uptr)m);
1006  int res = REAL(pthread_cond_timedwait)(c, m, abstime);
1007  MutexLock(thr, pc, (uptr)m);
1008  return res;
1009}
1010
1011TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1012  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1013  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1014  int res = REAL(pthread_barrier_init)(b, a, count);
1015  return res;
1016}
1017
1018TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1019  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1020  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1021  int res = REAL(pthread_barrier_destroy)(b);
1022  return res;
1023}
1024
1025TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1026  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1027  Release(thr, pc, (uptr)b);
1028  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1029  int res = REAL(pthread_barrier_wait)(b);
1030  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1031  if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1032    Acquire(thr, pc, (uptr)b);
1033  }
1034  return res;
1035}
1036
1037TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1038  SCOPED_TSAN_INTERCEPTOR(pthread_once, o, f);
1039  if (o == 0 || f == 0)
1040    return EINVAL;
1041  atomic_uint32_t *a = static_cast<atomic_uint32_t*>(o);
1042  u32 v = atomic_load(a, memory_order_acquire);
1043  if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1044                                               memory_order_relaxed)) {
1045    const int old_in_rtl = thr->in_rtl;
1046    thr->in_rtl = 0;
1047    (*f)();
1048    CHECK_EQ(thr->in_rtl, 0);
1049    thr->in_rtl = old_in_rtl;
1050    Release(thr, pc, (uptr)o);
1051    atomic_store(a, 2, memory_order_release);
1052  } else {
1053    while (v != 2) {
1054      pthread_yield();
1055      v = atomic_load(a, memory_order_acquire);
1056    }
1057    Acquire(thr, pc, (uptr)o);
1058  }
1059  return 0;
1060}
1061
1062TSAN_INTERCEPTOR(int, sem_init, void *s, int pshared, unsigned value) {
1063  SCOPED_TSAN_INTERCEPTOR(sem_init, s, pshared, value);
1064  int res = REAL(sem_init)(s, pshared, value);
1065  return res;
1066}
1067
1068TSAN_INTERCEPTOR(int, sem_destroy, void *s) {
1069  SCOPED_TSAN_INTERCEPTOR(sem_destroy, s);
1070  int res = REAL(sem_destroy)(s);
1071  return res;
1072}
1073
1074TSAN_INTERCEPTOR(int, sem_wait, void *s) {
1075  SCOPED_TSAN_INTERCEPTOR(sem_wait, s);
1076  int res = BLOCK_REAL(sem_wait)(s);
1077  if (res == 0) {
1078    Acquire(thr, pc, (uptr)s);
1079  }
1080  return res;
1081}
1082
1083TSAN_INTERCEPTOR(int, sem_trywait, void *s) {
1084  SCOPED_TSAN_INTERCEPTOR(sem_trywait, s);
1085  int res = BLOCK_REAL(sem_trywait)(s);
1086  if (res == 0) {
1087    Acquire(thr, pc, (uptr)s);
1088  }
1089  return res;
1090}
1091
1092TSAN_INTERCEPTOR(int, sem_timedwait, void *s, void *abstime) {
1093  SCOPED_TSAN_INTERCEPTOR(sem_timedwait, s, abstime);
1094  int res = BLOCK_REAL(sem_timedwait)(s, abstime);
1095  if (res == 0) {
1096    Acquire(thr, pc, (uptr)s);
1097  }
1098  return res;
1099}
1100
1101TSAN_INTERCEPTOR(int, sem_post, void *s) {
1102  SCOPED_TSAN_INTERCEPTOR(sem_post, s);
1103  Release(thr, pc, (uptr)s);
1104  int res = REAL(sem_post)(s);
1105  return res;
1106}
1107
1108TSAN_INTERCEPTOR(int, sem_getvalue, void *s, int *sval) {
1109  SCOPED_TSAN_INTERCEPTOR(sem_getvalue, s, sval);
1110  int res = REAL(sem_getvalue)(s, sval);
1111  if (res == 0) {
1112    Acquire(thr, pc, (uptr)s);
1113  }
1114  return res;
1115}
1116
1117TSAN_INTERCEPTOR(int, __xstat, int version, const char *path, void *buf) {
1118  SCOPED_TSAN_INTERCEPTOR(__xstat, version, path, buf);
1119  return REAL(__xstat)(version, path, buf);
1120}
1121
1122TSAN_INTERCEPTOR(int, stat, const char *path, void *buf) {
1123  SCOPED_TSAN_INTERCEPTOR(__xstat, 0, path, buf);
1124  return REAL(__xstat)(0, path, buf);
1125}
1126
1127TSAN_INTERCEPTOR(int, __xstat64, int version, const char *path, void *buf) {
1128  SCOPED_TSAN_INTERCEPTOR(__xstat64, version, path, buf);
1129  return REAL(__xstat64)(version, path, buf);
1130}
1131
1132TSAN_INTERCEPTOR(int, stat64, const char *path, void *buf) {
1133  SCOPED_TSAN_INTERCEPTOR(__xstat64, 0, path, buf);
1134  return REAL(__xstat64)(0, path, buf);
1135}
1136
1137TSAN_INTERCEPTOR(int, __lxstat, int version, const char *path, void *buf) {
1138  SCOPED_TSAN_INTERCEPTOR(__lxstat, version, path, buf);
1139  return REAL(__lxstat)(version, path, buf);
1140}
1141
1142TSAN_INTERCEPTOR(int, lstat, const char *path, void *buf) {
1143  SCOPED_TSAN_INTERCEPTOR(__lxstat, 0, path, buf);
1144  return REAL(__lxstat)(0, path, buf);
1145}
1146
1147TSAN_INTERCEPTOR(int, __lxstat64, int version, const char *path, void *buf) {
1148  SCOPED_TSAN_INTERCEPTOR(__lxstat64, version, path, buf);
1149  return REAL(__lxstat64)(version, path, buf);
1150}
1151
1152TSAN_INTERCEPTOR(int, lstat64, const char *path, void *buf) {
1153  SCOPED_TSAN_INTERCEPTOR(__lxstat64, 0, path, buf);
1154  return REAL(__lxstat64)(0, path, buf);
1155}
1156
1157TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1158  SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1159  if (fd > 0)
1160    FdAccess(thr, pc, fd);
1161  return REAL(__fxstat)(version, fd, buf);
1162}
1163
1164TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1165  SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
1166  if (fd > 0)
1167    FdAccess(thr, pc, fd);
1168  return REAL(__fxstat)(0, fd, buf);
1169}
1170
1171TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1172  SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1173  if (fd > 0)
1174    FdAccess(thr, pc, fd);
1175  return REAL(__fxstat64)(version, fd, buf);
1176}
1177
1178TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1179  SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
1180  if (fd > 0)
1181    FdAccess(thr, pc, fd);
1182  return REAL(__fxstat64)(0, fd, buf);
1183}
1184
1185TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1186  SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1187  int fd = REAL(open)(name, flags, mode);
1188  if (fd >= 0)
1189    FdFileCreate(thr, pc, fd);
1190  return fd;
1191}
1192
1193TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
1194  SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
1195  int fd = REAL(open64)(name, flags, mode);
1196  if (fd >= 0)
1197    FdFileCreate(thr, pc, fd);
1198  return fd;
1199}
1200
1201TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1202  SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1203  int fd = REAL(creat)(name, mode);
1204  if (fd >= 0)
1205    FdFileCreate(thr, pc, fd);
1206  return fd;
1207}
1208
1209TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1210  SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1211  int fd = REAL(creat64)(name, mode);
1212  if (fd >= 0)
1213    FdFileCreate(thr, pc, fd);
1214  return fd;
1215}
1216
1217TSAN_INTERCEPTOR(int, dup, int oldfd) {
1218  SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1219  int newfd = REAL(dup)(oldfd);
1220  if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1221    FdDup(thr, pc, oldfd, newfd);
1222  return newfd;
1223}
1224
1225TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1226  SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1227  int newfd2 = REAL(dup2)(oldfd, newfd);
1228  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1229    FdDup(thr, pc, oldfd, newfd2);
1230  return newfd2;
1231}
1232
1233TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1234  SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1235  int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1236  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1237    FdDup(thr, pc, oldfd, newfd2);
1238  return newfd2;
1239}
1240
1241TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1242  SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1243  int fd = REAL(eventfd)(initval, flags);
1244  if (fd >= 0)
1245    FdEventCreate(thr, pc, fd);
1246  return fd;
1247}
1248
1249TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1250  SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1251  if (fd >= 0)
1252    FdClose(thr, pc, fd);
1253  fd = REAL(signalfd)(fd, mask, flags);
1254  if (fd >= 0)
1255    FdSignalCreate(thr, pc, fd);
1256  return fd;
1257}
1258
1259TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1260  SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1261  int fd = REAL(inotify_init)(fake);
1262  if (fd >= 0)
1263    FdInotifyCreate(thr, pc, fd);
1264  return fd;
1265}
1266
1267TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1268  SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1269  int fd = REAL(inotify_init1)(flags);
1270  if (fd >= 0)
1271    FdInotifyCreate(thr, pc, fd);
1272  return fd;
1273}
1274
1275TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1276  SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1277  int fd = REAL(socket)(domain, type, protocol);
1278  if (fd >= 0)
1279    FdSocketCreate(thr, pc, fd);
1280  return fd;
1281}
1282
1283TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1284  SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1285  int res = REAL(socketpair)(domain, type, protocol, fd);
1286  if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1287    FdPipeCreate(thr, pc, fd[0], fd[1]);
1288  return res;
1289}
1290
1291TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1292  SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1293  FdSocketConnecting(thr, pc, fd);
1294  int res = REAL(connect)(fd, addr, addrlen);
1295  if (res == 0 && fd >= 0)
1296    FdSocketConnect(thr, pc, fd);
1297  return res;
1298}
1299
1300TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
1301  SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
1302  int res = REAL(bind)(fd, addr, addrlen);
1303  if (fd > 0 && res == 0)
1304    FdAccess(thr, pc, fd);
1305  return res;
1306}
1307
1308TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
1309  SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
1310  int res = REAL(listen)(fd, backlog);
1311  if (fd > 0 && res == 0)
1312    FdAccess(thr, pc, fd);
1313  return res;
1314}
1315
1316TSAN_INTERCEPTOR(int, accept, int fd, void *addr, unsigned *addrlen) {
1317  SCOPED_TSAN_INTERCEPTOR(accept, fd, addr, addrlen);
1318  int fd2 = REAL(accept)(fd, addr, addrlen);
1319  if (fd >= 0 && fd2 >= 0)
1320    FdSocketAccept(thr, pc, fd, fd2);
1321  return fd2;
1322}
1323
1324TSAN_INTERCEPTOR(int, accept4, int fd, void *addr, unsigned *addrlen, int f) {
1325  SCOPED_TSAN_INTERCEPTOR(accept4, fd, addr, addrlen, f);
1326  int fd2 = REAL(accept4)(fd, addr, addrlen, f);
1327  if (fd >= 0 && fd2 >= 0)
1328    FdSocketAccept(thr, pc, fd, fd2);
1329  return fd2;
1330}
1331
1332TSAN_INTERCEPTOR(int, epoll_create, int size) {
1333  SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1334  int fd = REAL(epoll_create)(size);
1335  if (fd >= 0)
1336    FdPollCreate(thr, pc, fd);
1337  return fd;
1338}
1339
1340TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1341  SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1342  int fd = REAL(epoll_create1)(flags);
1343  if (fd >= 0)
1344    FdPollCreate(thr, pc, fd);
1345  return fd;
1346}
1347
1348TSAN_INTERCEPTOR(int, close, int fd) {
1349  SCOPED_TSAN_INTERCEPTOR(close, fd);
1350  if (fd >= 0)
1351    FdClose(thr, pc, fd);
1352  return REAL(close)(fd);
1353}
1354
1355TSAN_INTERCEPTOR(int, __close, int fd) {
1356  SCOPED_TSAN_INTERCEPTOR(__close, fd);
1357  if (fd >= 0)
1358    FdClose(thr, pc, fd);
1359  return REAL(__close)(fd);
1360}
1361
1362// glibc guts
1363TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
1364  SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
1365  int fds[64];
1366  int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
1367  for (int i = 0; i < cnt; i++) {
1368    if (fds[i] > 0)
1369      FdClose(thr, pc, fds[i]);
1370  }
1371  REAL(__res_iclose)(state, free_addr);
1372}
1373
1374TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1375  SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1376  int res = REAL(pipe)(pipefd);
1377  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1378    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1379  return res;
1380}
1381
1382TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1383  SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1384  int res = REAL(pipe2)(pipefd, flags);
1385  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1386    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1387  return res;
1388}
1389
1390TSAN_INTERCEPTOR(long_t, readv, int fd, void *vec, int cnt) {
1391  SCOPED_TSAN_INTERCEPTOR(readv, fd, vec, cnt);
1392  int res = REAL(readv)(fd, vec, cnt);
1393  if (res >= 0 && fd >= 0) {
1394    FdAcquire(thr, pc, fd);
1395  }
1396  return res;
1397}
1398
1399TSAN_INTERCEPTOR(long_t, preadv64, int fd, void *vec, int cnt, u64 off) {
1400  SCOPED_TSAN_INTERCEPTOR(preadv64, fd, vec, cnt, off);
1401  int res = REAL(preadv64)(fd, vec, cnt, off);
1402  if (res >= 0 && fd >= 0) {
1403    FdAcquire(thr, pc, fd);
1404  }
1405  return res;
1406}
1407
1408TSAN_INTERCEPTOR(long_t, writev, int fd, void *vec, int cnt) {
1409  SCOPED_TSAN_INTERCEPTOR(writev, fd, vec, cnt);
1410  if (fd >= 0)
1411    FdRelease(thr, pc, fd);
1412  int res = REAL(writev)(fd, vec, cnt);
1413  return res;
1414}
1415
1416TSAN_INTERCEPTOR(long_t, pwritev64, int fd, void *vec, int cnt, u64 off) {
1417  SCOPED_TSAN_INTERCEPTOR(pwritev64, fd, vec, cnt, off);
1418  if (fd >= 0)
1419    FdRelease(thr, pc, fd);
1420  int res = REAL(pwritev64)(fd, vec, cnt, off);
1421  return res;
1422}
1423
1424TSAN_INTERCEPTOR(long_t, send, int fd, void *buf, long_t len, int flags) {
1425  SCOPED_TSAN_INTERCEPTOR(send, fd, buf, len, flags);
1426  if (fd >= 0)
1427    FdRelease(thr, pc, fd);
1428  int res = REAL(send)(fd, buf, len, flags);
1429  return res;
1430}
1431
1432TSAN_INTERCEPTOR(long_t, sendmsg, int fd, void *msg, int flags) {
1433  SCOPED_TSAN_INTERCEPTOR(sendmsg, fd, msg, flags);
1434  if (fd >= 0)
1435    FdRelease(thr, pc, fd);
1436  int res = REAL(sendmsg)(fd, msg, flags);
1437  return res;
1438}
1439
1440TSAN_INTERCEPTOR(long_t, recv, int fd, void *buf, long_t len, int flags) {
1441  SCOPED_TSAN_INTERCEPTOR(recv, fd, buf, len, flags);
1442  int res = REAL(recv)(fd, buf, len, flags);
1443  if (res >= 0 && fd >= 0) {
1444    FdAcquire(thr, pc, fd);
1445  }
1446  return res;
1447}
1448
1449TSAN_INTERCEPTOR(long_t, recvmsg, int fd, void *msg, int flags) {
1450  SCOPED_TSAN_INTERCEPTOR(recvmsg, fd, msg, flags);
1451  int res = REAL(recvmsg)(fd, msg, flags);
1452  if (res >= 0 && fd >= 0) {
1453    FdAcquire(thr, pc, fd);
1454  }
1455  return res;
1456}
1457
1458TSAN_INTERCEPTOR(int, unlink, char *path) {
1459  SCOPED_TSAN_INTERCEPTOR(unlink, path);
1460  Release(thr, pc, File2addr(path));
1461  int res = REAL(unlink)(path);
1462  return res;
1463}
1464
1465TSAN_INTERCEPTOR(void*, fopen, char *path, char *mode) {
1466  SCOPED_TSAN_INTERCEPTOR(fopen, path, mode);
1467  void *res = REAL(fopen)(path, mode);
1468  Acquire(thr, pc, File2addr(path));
1469  if (res) {
1470    int fd = fileno_unlocked(res);
1471    if (fd >= 0)
1472      FdFileCreate(thr, pc, fd);
1473  }
1474  return res;
1475}
1476
1477TSAN_INTERCEPTOR(void*, freopen, char *path, char *mode, void *stream) {
1478  SCOPED_TSAN_INTERCEPTOR(freopen, path, mode, stream);
1479  if (stream) {
1480    int fd = fileno_unlocked(stream);
1481    if (fd >= 0)
1482      FdClose(thr, pc, fd);
1483  }
1484  void *res = REAL(freopen)(path, mode, stream);
1485  Acquire(thr, pc, File2addr(path));
1486  if (res) {
1487    int fd = fileno_unlocked(res);
1488    if (fd >= 0)
1489      FdFileCreate(thr, pc, fd);
1490  }
1491  return res;
1492}
1493
1494TSAN_INTERCEPTOR(int, fclose, void *stream) {
1495  {
1496    SCOPED_TSAN_INTERCEPTOR(fclose, stream);
1497    if (stream) {
1498      int fd = fileno_unlocked(stream);
1499      if (fd >= 0)
1500        FdClose(thr, pc, fd);
1501    }
1502  }
1503  return REAL(fclose)(stream);
1504}
1505
1506TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1507  {
1508    SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1509    MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1510  }
1511  return REAL(fread)(ptr, size, nmemb, f);
1512}
1513
1514TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1515  {
1516    SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1517    MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1518  }
1519  return REAL(fwrite)(p, size, nmemb, f);
1520}
1521
1522TSAN_INTERCEPTOR(int, puts, const char *s) {
1523  SCOPED_TSAN_INTERCEPTOR(puts, s);
1524  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1525  return REAL(puts)(s);
1526}
1527
1528TSAN_INTERCEPTOR(int, rmdir, char *path) {
1529  SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1530  Release(thr, pc, Dir2addr(path));
1531  int res = REAL(rmdir)(path);
1532  return res;
1533}
1534
1535TSAN_INTERCEPTOR(void*, opendir, char *path) {
1536  SCOPED_TSAN_INTERCEPTOR(opendir, path);
1537  void *res = REAL(opendir)(path);
1538  if (res != 0)
1539    Acquire(thr, pc, Dir2addr(path));
1540  return res;
1541}
1542
1543TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1544  SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1545  if (op == EPOLL_CTL_ADD && epfd >= 0) {
1546    FdRelease(thr, pc, epfd);
1547  }
1548  int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1549  if (fd >= 0)
1550    FdAccess(thr, pc, fd);
1551  return res;
1552}
1553
1554TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1555  SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1556  int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1557  if (res > 0 && epfd >= 0) {
1558    FdAcquire(thr, pc, epfd);
1559  }
1560  return res;
1561}
1562
1563TSAN_INTERCEPTOR(int, poll, void *fds, long_t nfds, int timeout) {
1564  SCOPED_TSAN_INTERCEPTOR(poll, fds, nfds, timeout);
1565  int res = BLOCK_REAL(poll)(fds, nfds, timeout);
1566  return res;
1567}
1568
1569static void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1570    my_siginfo_t *info, void *ctx) {
1571  ThreadState *thr = cur_thread();
1572  SignalContext *sctx = SigCtx(thr);
1573  // Don't mess with synchronous signals.
1574  if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1575      sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE ||
1576      // If we are sending signal to ourselves, we must process it now.
1577      (sctx && sig == sctx->int_signal_send) ||
1578      // If we are in blocking function, we can safely process it now
1579      // (but check if we are in a recursive interceptor,
1580      // i.e. pthread_join()->munmap()).
1581      (sctx && sctx->in_blocking_func == 1 && thr->in_rtl == 1)) {
1582    CHECK(thr->in_rtl == 0 || thr->in_rtl == 1);
1583    int in_rtl = thr->in_rtl;
1584    thr->in_rtl = 0;
1585    CHECK_EQ(thr->in_signal_handler, false);
1586    thr->in_signal_handler = true;
1587    if (sigact)
1588      sigactions[sig].sa_sigaction(sig, info, ctx);
1589    else
1590      sigactions[sig].sa_handler(sig);
1591    CHECK_EQ(thr->in_signal_handler, true);
1592    thr->in_signal_handler = false;
1593    thr->in_rtl = in_rtl;
1594    return;
1595  }
1596
1597  if (sctx == 0)
1598    return;
1599  SignalDesc *signal = &sctx->pending_signals[sig];
1600  if (signal->armed == false) {
1601    signal->armed = true;
1602    signal->sigaction = sigact;
1603    if (info)
1604      internal_memcpy(&signal->siginfo, info, sizeof(*info));
1605    if (ctx)
1606      internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1607    sctx->pending_signal_count++;
1608  }
1609}
1610
1611static void rtl_sighandler(int sig) {
1612  rtl_generic_sighandler(false, sig, 0, 0);
1613}
1614
1615static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1616  rtl_generic_sighandler(true, sig, info, ctx);
1617}
1618
1619TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1620  SCOPED_TSAN_INTERCEPTOR(sigaction, sig, act, old);
1621  if (old)
1622    internal_memcpy(old, &sigactions[sig], sizeof(*old));
1623  if (act == 0)
1624    return 0;
1625  internal_memcpy(&sigactions[sig], act, sizeof(*act));
1626  sigaction_t newact;
1627  internal_memcpy(&newact, act, sizeof(newact));
1628  sigfillset(&newact.sa_mask);
1629  if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1630    if (newact.sa_flags & SA_SIGINFO)
1631      newact.sa_sigaction = rtl_sigaction;
1632    else
1633      newact.sa_handler = rtl_sighandler;
1634  }
1635  int res = REAL(sigaction)(sig, &newact, 0);
1636  return res;
1637}
1638
1639TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1640  sigaction_t act;
1641  act.sa_handler = h;
1642  REAL(memset)(&act.sa_mask, -1, sizeof(act.sa_mask));
1643  act.sa_flags = 0;
1644  sigaction_t old;
1645  int res = sigaction(sig, &act, &old);
1646  if (res)
1647    return SIG_ERR;
1648  return old.sa_handler;
1649}
1650
1651TSAN_INTERCEPTOR(int, raise, int sig) {
1652  SCOPED_TSAN_INTERCEPTOR(raise, sig);
1653  SignalContext *sctx = SigCtx(thr);
1654  CHECK_NE(sctx, 0);
1655  int prev = sctx->int_signal_send;
1656  sctx->int_signal_send = sig;
1657  int res = REAL(raise)(sig);
1658  CHECK_EQ(sctx->int_signal_send, sig);
1659  sctx->int_signal_send = prev;
1660  return res;
1661}
1662
1663TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1664  SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1665  SignalContext *sctx = SigCtx(thr);
1666  CHECK_NE(sctx, 0);
1667  int prev = sctx->int_signal_send;
1668  if (pid == GetPid()) {
1669    sctx->int_signal_send = sig;
1670  }
1671  int res = REAL(kill)(pid, sig);
1672  if (pid == GetPid()) {
1673    CHECK_EQ(sctx->int_signal_send, sig);
1674    sctx->int_signal_send = prev;
1675  }
1676  return res;
1677}
1678
1679TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1680  SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1681  SignalContext *sctx = SigCtx(thr);
1682  CHECK_NE(sctx, 0);
1683  int prev = sctx->int_signal_send;
1684  if (tid == pthread_self()) {
1685    sctx->int_signal_send = sig;
1686  }
1687  int res = REAL(pthread_kill)(tid, sig);
1688  if (tid == pthread_self()) {
1689    CHECK_EQ(sctx->int_signal_send, sig);
1690    sctx->int_signal_send = prev;
1691  }
1692  return res;
1693}
1694
1695TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
1696  SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
1697  // It's intercepted merely to process pending signals.
1698  return REAL(gettimeofday)(tv, tz);
1699}
1700
1701// Linux kernel has a bug that leads to kernel deadlock if a process
1702// maps TBs of memory and then calls mlock().
1703static void MlockIsUnsupported() {
1704  static atomic_uint8_t printed;
1705  if (atomic_exchange(&printed, 1, memory_order_relaxed))
1706    return;
1707  Printf("INFO: ThreadSanitizer ignores mlock/mlockall/munlock/munlockall\n");
1708}
1709
1710TSAN_INTERCEPTOR(int, mlock, const void *addr, uptr len) {
1711  MlockIsUnsupported();
1712  return 0;
1713}
1714
1715TSAN_INTERCEPTOR(int, munlock, const void *addr, uptr len) {
1716  MlockIsUnsupported();
1717  return 0;
1718}
1719
1720TSAN_INTERCEPTOR(int, mlockall, int flags) {
1721  MlockIsUnsupported();
1722  return 0;
1723}
1724
1725TSAN_INTERCEPTOR(int, munlockall, void) {
1726  MlockIsUnsupported();
1727  return 0;
1728}
1729
1730TSAN_INTERCEPTOR(int, fork, int fake) {
1731  SCOPED_TSAN_INTERCEPTOR(fork, fake);
1732  // It's intercepted merely to process pending signals.
1733  int pid = REAL(fork)(fake);
1734  if (pid == 0) {
1735    // child
1736    FdOnFork(thr, pc);
1737  } else if (pid > 0) {
1738    // parent
1739  }
1740  return pid;
1741}
1742
1743struct TsanInterceptorContext {
1744  ThreadState *thr;
1745  const uptr caller_pc;
1746  const uptr pc;
1747};
1748
1749#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
1750    MemoryAccessRange(((TsanInterceptorContext*)ctx)->thr,  \
1751                      ((TsanInterceptorContext*)ctx)->pc,   \
1752                      (uptr)ptr, size, true)
1753#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size)       \
1754    MemoryAccessRange(((TsanInterceptorContext*)ctx)->thr,  \
1755                      ((TsanInterceptorContext*)ctx)->pc,   \
1756                      (uptr)ptr, size, false)
1757#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
1758    SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__) \
1759    TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
1760    ctx = (void*)&_ctx; \
1761    (void)ctx;
1762#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1763    FdAcquire(((TsanInterceptorContext*)ctx)->thr, pc, fd)
1764#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1765    FdRelease(((TsanInterceptorContext*)ctx)->thr, pc, fd)
1766#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1767    ThreadSetName(((TsanInterceptorContext*)ctx)->thr, name)
1768#include "sanitizer_common/sanitizer_common_interceptors.inc"
1769
1770namespace __tsan {
1771
1772void ProcessPendingSignals(ThreadState *thr) {
1773  CHECK_EQ(thr->in_rtl, 0);
1774  SignalContext *sctx = SigCtx(thr);
1775  if (sctx == 0 || sctx->pending_signal_count == 0 || thr->in_signal_handler)
1776    return;
1777  Context *ctx = CTX();
1778  thr->in_signal_handler = true;
1779  sctx->pending_signal_count = 0;
1780  // These are too big for stack.
1781  static THREADLOCAL sigset_t emptyset, oldset;
1782  sigfillset(&emptyset);
1783  pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
1784  for (int sig = 0; sig < kSigCount; sig++) {
1785    SignalDesc *signal = &sctx->pending_signals[sig];
1786    if (signal->armed) {
1787      signal->armed = false;
1788      if (sigactions[sig].sa_handler != SIG_DFL
1789          && sigactions[sig].sa_handler != SIG_IGN) {
1790        // Insure that the handler does not spoil errno.
1791        const int saved_errno = errno;
1792        errno = 0;
1793        if (signal->sigaction)
1794          sigactions[sig].sa_sigaction(sig, &signal->siginfo, &signal->ctx);
1795        else
1796          sigactions[sig].sa_handler(sig);
1797        if (flags()->report_bugs && errno != 0) {
1798          ScopedInRtl in_rtl;
1799          __tsan::StackTrace stack;
1800          uptr pc = signal->sigaction ?
1801              (uptr)sigactions[sig].sa_sigaction :
1802              (uptr)sigactions[sig].sa_handler;
1803          stack.Init(&pc, 1);
1804          ThreadRegistryLock l(ctx->thread_registry);
1805          ScopedReport rep(ReportTypeErrnoInSignal);
1806          if (!IsFiredSuppression(ctx, rep, stack)) {
1807            rep.AddStack(&stack);
1808            OutputReport(ctx, rep, rep.GetReport()->stacks[0]);
1809          }
1810        }
1811        errno = saved_errno;
1812      }
1813    }
1814  }
1815  pthread_sigmask(SIG_SETMASK, &oldset, 0);
1816  CHECK_EQ(thr->in_signal_handler, true);
1817  thr->in_signal_handler = false;
1818}
1819
1820static void unreachable() {
1821  Printf("FATAL: ThreadSanitizer: unreachable called\n");
1822  Die();
1823}
1824
1825void InitializeInterceptors() {
1826  CHECK_GT(cur_thread()->in_rtl, 0);
1827
1828  // We need to setup it early, because functions like dlsym() can call it.
1829  REAL(memset) = internal_memset;
1830  REAL(memcpy) = internal_memcpy;
1831  REAL(memcmp) = internal_memcmp;
1832
1833  SANITIZER_COMMON_INTERCEPTORS_INIT;
1834
1835  TSAN_INTERCEPT(longjmp);
1836  TSAN_INTERCEPT(siglongjmp);
1837
1838  TSAN_INTERCEPT(malloc);
1839  TSAN_INTERCEPT(__libc_memalign);
1840  TSAN_INTERCEPT(calloc);
1841  TSAN_INTERCEPT(realloc);
1842  TSAN_INTERCEPT(free);
1843  TSAN_INTERCEPT(cfree);
1844  TSAN_INTERCEPT(mmap);
1845  TSAN_INTERCEPT(mmap64);
1846  TSAN_INTERCEPT(munmap);
1847  TSAN_INTERCEPT(memalign);
1848  TSAN_INTERCEPT(valloc);
1849  TSAN_INTERCEPT(pvalloc);
1850  TSAN_INTERCEPT(posix_memalign);
1851
1852  TSAN_INTERCEPT(strlen);
1853  TSAN_INTERCEPT(memset);
1854  TSAN_INTERCEPT(memcpy);
1855  TSAN_INTERCEPT(strcmp);
1856  TSAN_INTERCEPT(memchr);
1857  TSAN_INTERCEPT(memrchr);
1858  TSAN_INTERCEPT(memmove);
1859  TSAN_INTERCEPT(memcmp);
1860  TSAN_INTERCEPT(strchr);
1861  TSAN_INTERCEPT(strchrnul);
1862  TSAN_INTERCEPT(strrchr);
1863  TSAN_INTERCEPT(strncmp);
1864  TSAN_INTERCEPT(strcpy);  // NOLINT
1865  TSAN_INTERCEPT(strncpy);
1866  TSAN_INTERCEPT(strstr);
1867
1868  TSAN_INTERCEPT(pthread_create);
1869  TSAN_INTERCEPT(pthread_join);
1870  TSAN_INTERCEPT(pthread_detach);
1871
1872  TSAN_INTERCEPT(pthread_mutex_init);
1873  TSAN_INTERCEPT(pthread_mutex_destroy);
1874  TSAN_INTERCEPT(pthread_mutex_lock);
1875  TSAN_INTERCEPT(pthread_mutex_trylock);
1876  TSAN_INTERCEPT(pthread_mutex_timedlock);
1877  TSAN_INTERCEPT(pthread_mutex_unlock);
1878
1879  TSAN_INTERCEPT(pthread_spin_init);
1880  TSAN_INTERCEPT(pthread_spin_destroy);
1881  TSAN_INTERCEPT(pthread_spin_lock);
1882  TSAN_INTERCEPT(pthread_spin_trylock);
1883  TSAN_INTERCEPT(pthread_spin_unlock);
1884
1885  TSAN_INTERCEPT(pthread_rwlock_init);
1886  TSAN_INTERCEPT(pthread_rwlock_destroy);
1887  TSAN_INTERCEPT(pthread_rwlock_rdlock);
1888  TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
1889  TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
1890  TSAN_INTERCEPT(pthread_rwlock_wrlock);
1891  TSAN_INTERCEPT(pthread_rwlock_trywrlock);
1892  TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
1893  TSAN_INTERCEPT(pthread_rwlock_unlock);
1894
1895  // TSAN_INTERCEPT(pthread_cond_init);
1896  TSAN_INTERCEPT(pthread_cond_destroy);
1897  TSAN_INTERCEPT(pthread_cond_signal);
1898  TSAN_INTERCEPT(pthread_cond_broadcast);
1899  TSAN_INTERCEPT(pthread_cond_wait);
1900  TSAN_INTERCEPT(pthread_cond_timedwait);
1901
1902  TSAN_INTERCEPT(pthread_barrier_init);
1903  TSAN_INTERCEPT(pthread_barrier_destroy);
1904  TSAN_INTERCEPT(pthread_barrier_wait);
1905
1906  TSAN_INTERCEPT(pthread_once);
1907
1908  TSAN_INTERCEPT(sem_init);
1909  TSAN_INTERCEPT(sem_destroy);
1910  TSAN_INTERCEPT(sem_wait);
1911  TSAN_INTERCEPT(sem_trywait);
1912  TSAN_INTERCEPT(sem_timedwait);
1913  TSAN_INTERCEPT(sem_post);
1914  TSAN_INTERCEPT(sem_getvalue);
1915
1916  TSAN_INTERCEPT(stat);
1917  TSAN_INTERCEPT(__xstat);
1918  TSAN_INTERCEPT(stat64);
1919  TSAN_INTERCEPT(__xstat64);
1920  TSAN_INTERCEPT(lstat);
1921  TSAN_INTERCEPT(__lxstat);
1922  TSAN_INTERCEPT(lstat64);
1923  TSAN_INTERCEPT(__lxstat64);
1924  TSAN_INTERCEPT(fstat);
1925  TSAN_INTERCEPT(__fxstat);
1926  TSAN_INTERCEPT(fstat64);
1927  TSAN_INTERCEPT(__fxstat64);
1928  TSAN_INTERCEPT(open);
1929  TSAN_INTERCEPT(open64);
1930  TSAN_INTERCEPT(creat);
1931  TSAN_INTERCEPT(creat64);
1932  TSAN_INTERCEPT(dup);
1933  TSAN_INTERCEPT(dup2);
1934  TSAN_INTERCEPT(dup3);
1935  TSAN_INTERCEPT(eventfd);
1936  TSAN_INTERCEPT(signalfd);
1937  TSAN_INTERCEPT(inotify_init);
1938  TSAN_INTERCEPT(inotify_init1);
1939  TSAN_INTERCEPT(socket);
1940  TSAN_INTERCEPT(socketpair);
1941  TSAN_INTERCEPT(connect);
1942  TSAN_INTERCEPT(bind);
1943  TSAN_INTERCEPT(listen);
1944  TSAN_INTERCEPT(accept);
1945  TSAN_INTERCEPT(accept4);
1946  TSAN_INTERCEPT(epoll_create);
1947  TSAN_INTERCEPT(epoll_create1);
1948  TSAN_INTERCEPT(close);
1949  TSAN_INTERCEPT(__close);
1950  TSAN_INTERCEPT(__res_iclose);
1951  TSAN_INTERCEPT(pipe);
1952  TSAN_INTERCEPT(pipe2);
1953
1954  TSAN_INTERCEPT(readv);
1955  TSAN_INTERCEPT(preadv64);
1956  TSAN_INTERCEPT(writev);
1957  TSAN_INTERCEPT(pwritev64);
1958  TSAN_INTERCEPT(send);
1959  TSAN_INTERCEPT(sendmsg);
1960  TSAN_INTERCEPT(recv);
1961  TSAN_INTERCEPT(recvmsg);
1962
1963  TSAN_INTERCEPT(unlink);
1964  TSAN_INTERCEPT(fopen);
1965  TSAN_INTERCEPT(freopen);
1966  TSAN_INTERCEPT(fclose);
1967  TSAN_INTERCEPT(fread);
1968  TSAN_INTERCEPT(fwrite);
1969  TSAN_INTERCEPT(puts);
1970  TSAN_INTERCEPT(rmdir);
1971  TSAN_INTERCEPT(opendir);
1972
1973  TSAN_INTERCEPT(epoll_ctl);
1974  TSAN_INTERCEPT(epoll_wait);
1975  TSAN_INTERCEPT(poll);
1976
1977  TSAN_INTERCEPT(sigaction);
1978  TSAN_INTERCEPT(signal);
1979  TSAN_INTERCEPT(raise);
1980  TSAN_INTERCEPT(kill);
1981  TSAN_INTERCEPT(pthread_kill);
1982  TSAN_INTERCEPT(sleep);
1983  TSAN_INTERCEPT(usleep);
1984  TSAN_INTERCEPT(nanosleep);
1985  TSAN_INTERCEPT(gettimeofday);
1986
1987  TSAN_INTERCEPT(mlock);
1988  TSAN_INTERCEPT(munlock);
1989  TSAN_INTERCEPT(mlockall);
1990  TSAN_INTERCEPT(munlockall);
1991
1992  TSAN_INTERCEPT(fork);
1993  TSAN_INTERCEPT(on_exit);
1994  TSAN_INTERCEPT(__cxa_atexit);
1995
1996  // Need to setup it, because interceptors check that the function is resolved.
1997  // But atexit is emitted directly into the module, so can't be resolved.
1998  REAL(atexit) = (int(*)(void(*)()))unreachable;
1999  atexit_ctx = new(internal_alloc(MBlockAtExit, sizeof(AtExitContext)))
2000      AtExitContext();
2001
2002  if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
2003    Printf("ThreadSanitizer: failed to setup atexit callback\n");
2004    Die();
2005  }
2006
2007  if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
2008    Printf("ThreadSanitizer: failed to create thread key\n");
2009    Die();
2010  }
2011
2012  FdInit();
2013}
2014
2015void internal_start_thread(void(*func)(void *arg), void *arg) {
2016  void *th;
2017  REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
2018  REAL(pthread_detach)(th);
2019}
2020
2021}  // namespace __tsan
2022