// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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// Always enable asserts.
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#ifdef NDEBUG
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#undef NDEBUG
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#endif
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#include <assert.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <unistd.h>
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#include <stdio.h>
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static bool signal_handler_ran = false;
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void do_nothing_signal_handler(int signum) {
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write(1, "HANDLER\n", 8);
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signal_handler_ran = true;
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}
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int main() {
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const int kSignalToTest = SIGSYS;
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assert(SIG_ERR != signal(kSignalToTest, do_nothing_signal_handler));
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sigset_t empty_set;
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assert(0 == sigemptyset(&empty_set));
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sigset_t one_signal = empty_set;
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assert(0 == sigaddset(&one_signal, kSignalToTest));
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sigset_t old_set;
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assert(0 == sigprocmask(SIG_BLOCK, &one_signal, &old_set));
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raise(kSignalToTest);
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assert(!signal_handler_ran);
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sigset_t all_but_one;
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assert(0 == sigfillset(&all_but_one));
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assert(0 == sigdelset(&all_but_one, kSignalToTest));
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sigsuspend(&all_but_one);
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assert(signal_handler_ran);
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// Restore the original set.
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assert(0 == sigprocmask(SIG_SETMASK, &old_set, NULL));
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printf("DONE\n");
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}
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// CHECK: HANDLER
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// CHECK: DONE
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