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      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 
     28 using namespace __tsan;  // NOLINT
     29 
     30 const int kSigCount = 128;
     31 
     32 struct my_siginfo_t {
     33   int opaque[128];
     34 };
     35 
     36 struct sigset_t {
     37   u64 val[1024 / 8 / sizeof(u64)];
     38 };
     39 
     40 struct ucontext_t {
     41   uptr opaque[117];
     42 };
     43 
     44 extern "C" int pthread_attr_init(void *attr);
     45 extern "C" int pthread_attr_destroy(void *attr);
     46 extern "C" int pthread_attr_getdetachstate(void *attr, int *v);
     47 extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
     48 extern "C" int pthread_attr_getstacksize(void *attr, uptr *stacksize);
     49 extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
     50 extern "C" int pthread_setspecific(unsigned key, const void *v);
     51 extern "C" int pthread_mutexattr_gettype(void *a, int *type);
     52 extern "C" int pthread_yield();
     53 extern "C" int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);
     54 extern "C" int sigfillset(sigset_t *set);
     55 extern "C" void *pthread_self();
     56 extern "C" void _exit(int status);
     57 extern "C" int *__errno_location();
     58 extern "C" int fileno_unlocked(void *stream);
     59 extern "C" void *__libc_malloc(uptr size);
     60 extern "C" void *__libc_calloc(uptr size, uptr n);
     61 extern "C" void *__libc_realloc(void *ptr, uptr size);
     62 extern "C" void __libc_free(void *ptr);
     63 const int PTHREAD_MUTEX_RECURSIVE = 1;
     64 const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
     65 const int kPthreadAttrSize = 56;
     66 const int EINVAL = 22;
     67 const int EBUSY = 16;
     68 const int EPOLL_CTL_ADD = 1;
     69 const int SIGILL = 4;
     70 const int SIGABRT = 6;
     71 const int SIGFPE = 8;
     72 const int SIGSEGV = 11;
     73 const int SIGPIPE = 13;
     74 const int SIGBUS = 7;
     75 void *const MAP_FAILED = (void*)-1;
     76 const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
     77 const int MAP_FIXED = 0x10;
     78 typedef 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 
     86 typedef void (*sighandler_t)(int sig);
     87 
     88 #define errno (*__errno_location())
     89 
     90 struct 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 
    100 const sighandler_t SIG_DFL = (sighandler_t)0;
    101 const sighandler_t SIG_IGN = (sighandler_t)1;
    102 const sighandler_t SIG_ERR = (sighandler_t)-1;
    103 const int SA_SIGINFO = 4;
    104 const int SIG_SETMASK = 2;
    105 
    106 namespace std {
    107 struct nothrow_t {};
    108 }  // namespace std
    109 
    110 static sigaction_t sigactions[kSigCount];
    111 
    112 namespace __tsan {
    113 struct SignalDesc {
    114   bool armed;
    115   bool sigaction;
    116   my_siginfo_t siginfo;
    117   ucontext_t ctx;
    118 };
    119 
    120 struct 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 
    128 static 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 
    139 static unsigned g_thread_finalize_key;
    140 
    141 class 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 
    150 ScopedInterceptor::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 
    164 ScopedInterceptor::~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 
    199 struct 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 
    212 TSAN_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 
    219 TSAN_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 
    226 TSAN_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 
    233 class 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 
    292 static AtExitContext *atexit_ctx;
    293 
    294 static 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 
    303 TSAN_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 
    310 TSAN_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 
    317 TSAN_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 
    326 TSAN_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 
    332 TSAN_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 
    338 TSAN_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 
    350 TSAN_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 
    355 TSAN_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 
    369 TSAN_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 
    382 TSAN_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 
    392 TSAN_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 
    402 TSAN_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 
    418 void *operator new(__sanitizer::uptr size) {
    419   OPERATOR_NEW_BODY(_Znwm);
    420 }
    421 void *operator new[](__sanitizer::uptr size) {
    422   OPERATOR_NEW_BODY(_Znam);
    423 }
    424 void *operator new(__sanitizer::uptr size, std::nothrow_t const&) {
    425   OPERATOR_NEW_BODY(_ZnwmRKSt9nothrow_t);
    426 }
    427 void *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 
    439 void operator delete(void *ptr) {
    440   OPERATOR_DELETE_BODY(_ZdlPv);
    441 }
    442 void operator delete[](void *ptr) {
    443   OPERATOR_DELETE_BODY(_ZdlPvRKSt9nothrow_t);
    444 }
    445 void operator delete(void *ptr, std::nothrow_t const&) {
    446   OPERATOR_DELETE_BODY(_ZdaPv);
    447 }
    448 void operator delete[](void *ptr, std::nothrow_t const&) {
    449   OPERATOR_DELETE_BODY(_ZdaPvRKSt9nothrow_t);
    450 }
    451 
    452 TSAN_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 
    459 TSAN_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 
    465 TSAN_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 
    472 TSAN_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 
    485 TSAN_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 
    497 TSAN_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 
    509 TSAN_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 
    517 TSAN_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 
    523 TSAN_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 
    530 TSAN_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 
    538 TSAN_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 
    546 TSAN_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 
    552 TSAN_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 
    560 TSAN_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 
    568 TSAN_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 
    578 static 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 
    592 TSAN_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 
    606 TSAN_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 
    620 TSAN_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 
    627 TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
    628   SCOPED_TSAN_INTERCEPTOR(memalign, align, sz);
    629   return user_alloc(thr, pc, sz, align);
    630 }
    631 
    632 TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
    633   SCOPED_TSAN_INTERCEPTOR(valloc, sz);
    634   return user_alloc(thr, pc, sz, GetPageSizeCached());
    635 }
    636 
    637 TSAN_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 
    643 TSAN_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.
    650 extern "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 
    666 extern "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 
    672 extern "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 
    677 static 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 
    699 struct ThreadParam {
    700   void* (*callback)(void *arg);
    701   void *param;
    702   atomic_uintptr_t tid;
    703 };
    704 
    705 extern "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 
    731 TSAN_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 
    766 TSAN_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 
    776 TSAN_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 
    786 TSAN_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 
    802 TSAN_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 
    811 TSAN_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 
    820 TSAN_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 
    829 TSAN_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 
    838 TSAN_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 
    845 TSAN_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 
    854 TSAN_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 
    863 TSAN_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 
    872 TSAN_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 
    881 TSAN_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 
    888 TSAN_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 
    897 TSAN_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 
    906 TSAN_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 
    915 TSAN_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 
    924 TSAN_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 
    933 TSAN_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 
    942 TSAN_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 
    951 TSAN_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 
    960 TSAN_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 /*
    970 TSAN_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 
    977 TSAN_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 
    983 TSAN_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 
    989 TSAN_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 
    995 TSAN_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 
   1003 TSAN_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 
   1011 TSAN_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 
   1018 TSAN_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 
   1025 TSAN_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 
   1037 TSAN_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 
   1062 TSAN_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 
   1068 TSAN_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 
   1074 TSAN_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 
   1083 TSAN_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 
   1092 TSAN_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 
   1101 TSAN_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 
   1108 TSAN_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 
   1117 TSAN_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 
   1122 TSAN_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 
   1127 TSAN_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 
   1132 TSAN_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 
   1137 TSAN_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 
   1142 TSAN_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 
   1147 TSAN_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 
   1152 TSAN_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 
   1157 TSAN_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 
   1164 TSAN_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 
   1171 TSAN_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 
   1178 TSAN_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 
   1185 TSAN_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 
   1193 TSAN_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 
   1201 TSAN_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 
   1209 TSAN_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 
   1217 TSAN_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 
   1225 TSAN_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 
   1233 TSAN_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 
   1241 TSAN_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 
   1249 TSAN_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 
   1259 TSAN_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 
   1267 TSAN_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 
   1275 TSAN_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 
   1283 TSAN_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 
   1291 TSAN_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 
   1300 TSAN_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 
   1308 TSAN_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 
   1316 TSAN_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 
   1324 TSAN_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 
   1332 TSAN_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 
   1340 TSAN_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 
   1348 TSAN_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 
   1355 TSAN_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
   1363 TSAN_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 
   1374 TSAN_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 
   1382 TSAN_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 
   1390 TSAN_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 
   1399 TSAN_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 
   1408 TSAN_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 
   1416 TSAN_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 
   1424 TSAN_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 
   1432 TSAN_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 
   1440 TSAN_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 
   1449 TSAN_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 
   1458 TSAN_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 
   1465 TSAN_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 
   1477 TSAN_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 
   1494 TSAN_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 
   1506 TSAN_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 
   1514 TSAN_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 
   1522 TSAN_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 
   1528 TSAN_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 
   1535 TSAN_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 
   1543 TSAN_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 
   1554 TSAN_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 
   1563 TSAN_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 
   1569 static 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 
   1611 static void rtl_sighandler(int sig) {
   1612   rtl_generic_sighandler(false, sig, 0, 0);
   1613 }
   1614 
   1615 static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
   1616   rtl_generic_sighandler(true, sig, info, ctx);
   1617 }
   1618 
   1619 TSAN_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 
   1639 TSAN_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 
   1651 TSAN_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 
   1663 TSAN_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 
   1679 TSAN_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 
   1695 TSAN_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().
   1703 static 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 
   1710 TSAN_INTERCEPTOR(int, mlock, const void *addr, uptr len) {
   1711   MlockIsUnsupported();
   1712   return 0;
   1713 }
   1714 
   1715 TSAN_INTERCEPTOR(int, munlock, const void *addr, uptr len) {
   1716   MlockIsUnsupported();
   1717   return 0;
   1718 }
   1719 
   1720 TSAN_INTERCEPTOR(int, mlockall, int flags) {
   1721   MlockIsUnsupported();
   1722   return 0;
   1723 }
   1724 
   1725 TSAN_INTERCEPTOR(int, munlockall, void) {
   1726   MlockIsUnsupported();
   1727   return 0;
   1728 }
   1729 
   1730 TSAN_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 
   1743 struct 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 
   1770 namespace __tsan {
   1771 
   1772 void 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 
   1820 static void unreachable() {
   1821   Printf("FATAL: ThreadSanitizer: unreachable called\n");
   1822   Die();
   1823 }
   1824 
   1825 void 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 
   2015 void 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