45 lines · cpp
1// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s2 3// Always enable asserts.4#ifdef NDEBUG5#undef NDEBUG6#endif7 8#include <assert.h>9#include <stdlib.h>10#include <signal.h>11#include <unistd.h>12#include <stdio.h>13 14static bool signal_handler_ran = false;15 16void do_nothing_signal_handler(int signum) {17 write(1, "HANDLER\n", 8);18 signal_handler_ran = true;19}20 21int 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: HANDLER44// CHECK: DONE45