1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s 2 3 // Always enable asserts. 4 #ifdef NDEBUG 5 #undef NDEBUG 6 #endif 7 8 #include <assert.h> 9 #include <stdlib.h> 10 #include <signal.h> 11 #include <unistd.h> 12 #include <stdio.h> 13 14 static bool signal_handler_ran = false; 15 16 void do_nothing_signal_handler(int signum) { 17 write(1, "HANDLER\n", 8); 18 signal_handler_ran = true; 19 } 20 21 int main() { 22 const int kSignalToTest = SIGSYS; 23 assert(SIG_ERR != signal(kSignalToTest, do_nothing_signal_handler)); 24 sigset_t empty_set; 25 assert(0 == sigemptyset(&empty_set)); 26 sigset_t one_signal = empty_set; 27 assert(0 == sigaddset(&one_signal, kSignalToTest)); 28 sigset_t old_set; 29 assert(0 == sigprocmask(SIG_BLOCK, &one_signal, &old_set)); 30 raise(kSignalToTest); 31 assert(!signal_handler_ran); 32 sigset_t all_but_one; 33 assert(0 == sigfillset(&all_but_one)); 34 assert(0 == sigdelset(&all_but_one, kSignalToTest)); 35 sigsuspend(&all_but_one); 36 assert(signal_handler_ran); 37 38 // Restore the original set. 39 assert(0 == sigprocmask(SIG_SETMASK, &old_set, NULL)); 40 printf("DONE\n"); 41 } 42 43 // CHECK: HANDLER 44 // CHECK: DONE 45
