src/compiler-rt/test/tsan/signal_errno.cc

   1 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
   2 #include "test.h"
   3 #include <signal.h>
   4 #include <sys/types.h>
   5 #include <errno.h>
   6
   7 pthread_t mainth;
   8 volatile int done;
   9
  10 static void MyHandler(int, siginfo_t *s, void *c) {
  11   errno = 1;
  12   done = 1;
  13 }
  14
  15 static void* sendsignal(void *p) {
  16   barrier_wait(&barrier);
  17   pthread_kill(mainth, SIGPROF);
  18   return 0;
  19 }
  20
  21 static __attribute__((noinline)) void loop() {
  22   barrier_wait(&barrier);
  23   while (done == 0) {
  24     volatile char *p = (char*)malloc(1);
  25     p[0] = 0;
  26     free((void*)p);
  27     sched_yield();
  28   }
  29 }
  30
  31 int main() {
  32   barrier_init(&barrier, 2);
  33   mainth = pthread_self();
  34   struct sigaction act = {};
  35   act.sa_sigaction = &MyHandler;
  36   sigaction(SIGPROF, &act, 0);
  37   pthread_t th;
  38   pthread_create(&th, 0, sendsignal, 0);
  39   loop();
  40   pthread_join(th, 0);
  41   return 0;
  42 }
  43
  44 // CHECK: WARNING: ThreadSanitizer: signal handler spoils errno
  45 // CHECK:     #0 MyHandler(int, {{(__)?}}siginfo{{(_t)?}}*, void*) {{.*}}signal_errno.cc
  46 // CHECK:     main
  47 // CHECK: SUMMARY: ThreadSanitizer: signal handler spoils errno{{.*}}MyHandler
  48