package runtime_lingering_descendant_test;

import os;

@test fn returning_test_clears_descendant() void = {
	let fds: [2]i32;
	assert(os.pipe(&fds) == 0);
	let pid: i32 = os.fork();
	assert(pid >= 0);
	if (pid == 0) {
		os.close(fds[0]);
		let mask: u64 = 1u64 << ((os.SIGTERM - 1): u64);
		if (os.sigprocmask(os.SIG_BLOCK, &mask, nil: *u64) != 0) {
			os.exit(120);
		};
		let ready: u8 = 1u8;
		if (os.write(fds[1], &ready, 1u64) != 1i64) { os.exit(121); };
		os.close(fds[1]);
		for (true) { };
	};
	os.close(fds[1]);
	let ready: u8 = 0u8;
	assert(os.read(fds[0], &ready, 1u64) == 1i64);
	os.close(fds[0]);
	assert(ready == 1u8);
};