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// Copyright 2021 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#define _GNU_SOURCE // for sighandler_t
#include <assert.h>
#include <stdio.h>
#include <stdbool.h>
#include <signal.h>
#include <unistd.h>
bool recieved1 = false;
bool recieved2 = false;
void block_sigusr1() {
sigset_t old;
sigset_t set;
sigaddset(&set, SIGUSR1);
int rc = sigprocmask(SIG_BLOCK, &set, &old);
assert(rc == 0);
assert(!sigismember(&old, SIGUSR1));
}
void unblock_all() {
sigset_t old;
sigset_t set;
sigfillset(&set);
int rc = sigprocmask(SIG_UNBLOCK, &set, &old);
assert(rc == 0);
}
void handler1(int sig) {
printf("handler1: %d\n", sig);
assert(sig == SIGUSR1);
recieved1 = true;
}
void test_bad_signal() {
printf("test_bad_signal\n");
sighandler_t old = signal(1024, handler1);
assert(old == SIG_ERR);
}
void test_raise_sigusr1() {
printf("test_raise_sigusr1\n");
sighandler_t old = signal(SIGUSR1, handler1);
assert(old != SIG_ERR);
raise(SIGUSR1);
int count = 0;
while (!recieved1) {
usleep(1000);
if (count++ == 1000) {
printf("handler1 not run\n");
assert(false);
}
}
}
void test_sigpenging() {
printf("test_sigpending\n");
recieved1 = false;
// Test that the pending set is empty
sigset_t pending;
sigpending(&pending);
assert(!sigismember(&pending, SIGUSR1));
block_sigusr1();
sighandler_t old_handler = signal(SIGUSR1, handler1);
assert(old_handler != SIG_ERR);
raise(SIGUSR1);
while (1) {
// Check that SIGUSR1 is now pending.
sigpending(&pending);
if (sigismember(&pending, SIGUSR1)) {
printf("is now pending\n");
break;
}
printf("is not pending\n");
}
// Unlock the signal and then check that is recieved.
assert(!recieved1);
unblock_all();
int count = 0;
while (!recieved1) {
usleep(1000);
if (count++ == 1000) {
printf("handler1 not run\n");
assert(false);
}
}
// Signal should no longer be pending
sigpending(&pending);
assert(!sigismember(&pending, SIGUSR1));
}
void test_sigwaitinfo() {
recieved1 = false;
block_sigusr1();
raise(SIGUSR1);
sighandler_t old_handler = signal(SIGUSR1, handler1);
assert(old_handler != SIG_ERR);
sigset_t set;
siginfo_t info;
sigaddset(&set, SIGUSR1);
int rc = sigwaitinfo(&set, &info);
assert(rc == SIGUSR1);
// Signal should no longer be pending
sigset_t pending;
sigpending(&pending);
assert(!sigismember(&pending, SIGUSR1));
unblock_all();
assert(!recieved1);
}
void test_sigaction() {
// Use sigaction to find the existing handlers
struct sigaction action;
sigaction(SIGUSR1, NULL, &action);
assert(action.sa_handler == SIG_DFL);
assert((void (*)(int))action.sa_sigaction == SIG_DFL);
// Now install a new handler
action.sa_handler = handler1;
sigaction(SIGUSR1, &action, NULL);
// Verify that the new handler is returned
struct sigaction action2;
sigaction(SIGUSR1, NULL, &action2);
assert(action2.sa_handler == handler1);
}
int main() {
test_sigaction();
test_bad_signal();
test_raise_sigusr1();
test_sigpenging();
test_sigwaitinfo();
return 0;
}
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