compiler-rt/test/tsan/signal_errno.cpp

   1 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
   2 // This test fails on powerpc64 BE (VMA=44), it does not appear to be
   3 // a functional problem, but the Tsan report is missing some info.
   4 // XFAIL: target=powerpc64-unknown-linux-gnu{{.*}}
   5
   6 #include "test.h"
   7 #include <signal.h>
   8 #include <sys/types.h>
   9 #include <errno.h>
  10
  11 pthread_t mainth;
  12 volatile int done;
  13
  14 static void MyHandler(int, siginfo_t *s, void *c) {
  15   errno = 1;
  16   done = 1;
  17 }
  18
  19 static void* sendsignal(void *p) {
  20   barrier_wait(&barrier);
  21   pthread_kill(mainth, SIGPROF);
  22   return 0;
  23 }
  24
  25 static __attribute__((noinline)) void loop() {
  26   barrier_wait(&barrier);
  27   while (done == 0) {
  28     volatile char *p = (char*)malloc(1);
  29     p[0] = 0;
  30     free((void*)p);
  31     sched_yield();
  32   }
  33 }
  34
  35 int main() {
  36   barrier_init(&barrier, 2);
  37   mainth = pthread_self();
  38   struct sigaction act = {};
  39   act.sa_sigaction = &MyHandler;
  40   sigaction(SIGPROF, &act, 0);
  41   pthread_t th;
  42   pthread_create(&th, 0, sendsignal, 0);
  43   loop();
  44   pthread_join(th, 0);
  45   return 0;
  46 }
  47
  48 // CHECK: WARNING: ThreadSanitizer: signal handler spoils errno
  49 // CHECK:   Signal 27 handler invoked at:
  50 // CHECK:     #0 MyHandler(int, {{(__)?}}siginfo{{(_t)?}}*, void*) {{.*}}signal_errno.cpp
  51 // CHECK:     main
  52 // CHECK: SUMMARY: ThreadSanitizer: signal handler spoils errno{{.*}}MyHandler