compiler-rt/test/msan/sigwait.cpp

   1 // RUN: %clangxx_msan -std=c++11 -O0 -g %s -o %t && %run %t
   2 // RUN: %clangxx_msan -DPOSITIVE -std=c++11 -O0 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
   3
   4 #include <assert.h>
   5 #include <signal.h>
   6 #include <sys/time.h>
   7 #include <sys/wait.h>
   8 #include <unistd.h>
   9
  10 #include <sanitizer/msan_interface.h>
  11
  12 void test_sigwait() {
  13   sigset_t s;
  14 #ifndef POSITIVE
  15   sigemptyset(&s);
  16   sigaddset(&s, SIGUSR1);
  17 #endif
  18   sigprocmask(SIG_BLOCK, &s, 0);
  19   // CHECK:  MemorySanitizer: use-of-uninitialized-value
  20
  21   if (pid_t pid = fork()) {
  22     kill(pid, SIGUSR1);
  23     int child_stat;
  24     wait(&child_stat);
  25     _exit(!WIFEXITED(child_stat));
  26   } else {
  27     int sig;
  28     int res = sigwait(&s, &sig);
  29     assert(!res);
  30     // The following checks that sig is initialized.
  31     assert(sig == SIGUSR1);
  32   }
  33 }
  34
  35 int main(void) {
  36   test_sigwait();
  37   return 0;
  38 }