xnu-4570.1.46.tar.gz

[apple/xnu.git] / tools / tests / darwintests / kevent_qos.c

/*
 * kevent_qos: Tests Synchronous IPC QOS override.
 */

#ifdef T_NAMESPACE
#undef T_NAMESPACE
#endif

#include <darwintest.h>
#include <darwintest_multiprocess.h>

#include <dispatch/dispatch.h>
#include <pthread.h>
#include <launch.h>
#include <mach/mach.h>
#include <mach/message.h>
#include <mach/mach_voucher.h>
#include <pthread/workqueue_private.h>
#include <voucher/ipc_pthread_priority_types.h>
#include <servers/bootstrap.h>
#include <stdlib.h>
#include <sys/event.h>
#include <unistd.h>
#include <crt_externs.h>

T_GLOBAL_META(T_META_NAMESPACE("xnu.kevent_qos"));

#define ARRAYLEN(arr) (sizeof(arr) / sizeof(arr[0]))

#define RECV_TIMEOUT_SECS   (4)
#define SEND_TIMEOUT_SECS   (6)
#define HELPER_TIMEOUT_SECS (15)

#define ENV_VAR_QOS (3)
static const char *qos_env[ENV_VAR_QOS] = {"XNU_TEST_QOS_BO",  "XNU_TEST_QOS_QO", "XNU_TEST_QOS_AO"};
static const char *qos_name_env[ENV_VAR_QOS] = {"XNU_TEST_QOS_NAME_BO", "XNU_TEST_QOS_NAME_QO", "XNU_TEST_QOS_NAME_AO"};

#define ENV_VAR_FUNCTION (1)
static const char *wl_function_name = "XNU_TEST_WL_FUNCTION";

static qos_class_t g_expected_qos[ENV_VAR_QOS];
static const char *g_expected_qos_name[ENV_VAR_QOS];

#define ENV_QOS_BEFORE_OVERRIDE (0)
#define ENV_QOS_QUEUE_OVERRIDE  (1)
#define ENV_QOS_AFTER_OVERRIDE  (2)

#pragma mark pthread callbacks

static void
worker_cb(pthread_priority_t __unused priority)
{
	T_FAIL("a worker thread was created");
}

static void
event_cb(void ** __unused events, int * __unused nevents)
{
	T_FAIL("a kevent routine was called instead of workloop");
}

/*
 * Basic WL handler callback, it sleeps for n seconds and then checks the
 * effective Qos of the servicer thread.
 */
static void
workloop_cb_test_intransit(uint64_t *workloop_id __unused, void **eventslist __unused, int *events)
{
	T_LOG("Workloop handler workloop_cb_test_intransit called. "
		"Will wait for %d seconds to make sure client enqueues the sync msg \n",
		2 * RECV_TIMEOUT_SECS);

	/* Wait for the client to send the high priority message to override the qos */
	sleep(2 * RECV_TIMEOUT_SECS);

	/* Skip the test if we can't check Qos */
	if (geteuid() != 0) {
		T_SKIP("kevent_qos test requires root privileges to run.");
	}

	/* The effective Qos should be the one expected after override */
	T_EXPECT_EFFECTIVE_QOS_EQ(g_expected_qos[ENV_QOS_AFTER_OVERRIDE],
			"dispatch_source event handler QoS should be %s", g_expected_qos_name[ENV_QOS_AFTER_OVERRIDE]);

	T_END;
	*events = 0;
}

/*
 * WL handler which checks if the servicer thread has correct Qos.
 */
static void
workloop_cb_test_sync_send(uint64_t *workloop_id __unused, void **eventslist __unused, int *events)
{
	T_LOG("Workloop handler workloop_cb_test_sync_send called");

	if (geteuid() != 0) {
		T_SKIP("kevent_qos test requires root privileges to run.");
	}

	/* The effective Qos should be the one expected after override */
	T_EXPECT_EFFECTIVE_QOS_EQ(g_expected_qos[ENV_QOS_AFTER_OVERRIDE],
			"dispatch_source event handler QoS should be %s", g_expected_qos_name[ENV_QOS_AFTER_OVERRIDE]);

	T_END;
	*events = 0;
}

/*
 * WL handler which checks the overridden Qos and then enables the knote and checks
 * for the Qos again if that dropped the sync ipc override.
 */
static void
workloop_cb_test_sync_send_and_enable(uint64_t *workloop_id, struct kevent_qos_s **eventslist, int *events)
{
	int r;
	T_LOG("Workloop handler workloop_cb_test_sync_send_and_enable called");

	if (geteuid() != 0) {
		T_SKIP("kevent_qos test requires root privileges to run.");
	}

	/* The effective Qos should be the one expected after override */
	T_EXPECT_EFFECTIVE_QOS_EQ(g_expected_qos[ENV_QOS_AFTER_OVERRIDE],
			"dispatch_source event handler QoS should be %s", g_expected_qos_name[ENV_QOS_AFTER_OVERRIDE]);

	/* Enable the knote */
	struct kevent_qos_s *kev = *eventslist;
	kev->flags = EV_ADD | EV_ENABLE | EV_UDATA_SPECIFIC | EV_DISPATCH | EV_VANISHED;
	struct kevent_qos_s kev_err[] = {{ 0 }};

	r = kevent_id(*workloop_id, kev, 1, kev_err, 1, NULL,
			NULL, KEVENT_FLAG_WORKLOOP | KEVENT_FLAG_ERROR_EVENTS | KEVENT_FLAG_DYNAMIC_KQ_MUST_EXIST);
	T_QUIET; T_ASSERT_POSIX_SUCCESS(r, "kevent_id");

	/* Sync override should have been removed */
	T_EXPECT_EFFECTIVE_QOS_EQ(g_expected_qos[ENV_QOS_BEFORE_OVERRIDE],
			"dispatch_source event handler QoS should be %s", g_expected_qos_name[ENV_QOS_BEFORE_OVERRIDE]);

	T_END;
	*events = 0;
}

/*
 * WL handler receives the first message and checks sync ipc override, then enables the knote
 * and receives 2nd message and checks it sync ipc override.
 */
static int send_two_sync_handler_called = 0;
static void
workloop_cb_test_send_two_sync(uint64_t *workloop_id __unused, struct kevent_qos_s **eventslist, int *events)
{
	T_LOG("Workloop handler workloop_cb_test_send_two_sync called for %d time", send_two_sync_handler_called + 1);

	if (geteuid() != 0) {
		T_SKIP("kevent_qos test requires root privileges to run.");
	}

	T_LOG("Number of events received is %d\n", *events);

	if (send_two_sync_handler_called == 0) {
		/* The effective Qos should be the one expected after override */
		T_EXPECT_EFFECTIVE_QOS_EQ(g_expected_qos[ENV_QOS_AFTER_OVERRIDE],
			"dispatch_source event handler QoS should be %s", g_expected_qos_name[ENV_QOS_AFTER_OVERRIDE]);

		/* Enable the knote to get 2nd message */
		struct kevent_qos_s *kev = *eventslist;
		kev->flags = EV_ADD | EV_ENABLE | EV_UDATA_SPECIFIC | EV_DISPATCH | EV_VANISHED;
		kev->fflags = (MACH_RCV_MSG | MACH_RCV_LARGE | MACH_RCV_LARGE_IDENTITY |
				MACH_RCV_TRAILER_ELEMENTS(MACH_RCV_TRAILER_CTX) |
				MACH_RCV_TRAILER_TYPE(MACH_MSG_TRAILER_FORMAT_0) |
				MACH_RCV_VOUCHER);
		*events = 1;
	} else {
		T_EXPECT_EFFECTIVE_QOS_EQ(g_expected_qos[ENV_QOS_BEFORE_OVERRIDE],
			"dispatch_source event handler QoS should be %s", g_expected_qos_name[ENV_QOS_BEFORE_OVERRIDE]);
		T_END;
		*events = 0;
	}
	send_two_sync_handler_called++;
}

/*
 * Checks the sync ipc override and then waits for client to destroy the
 * special reply port and checks if that removes the sync ipc override.
 */
static boolean_t two_send_and_destroy_test_passed = FALSE;
static int two_send_and_destroy_handler = 0;
static void
workloop_cb_test_two_send_and_destroy(uint64_t *workloop_id __unused, struct kevent_qos_s **eventslist __unused, int *events)
{
	T_LOG("Workloop handler workloop_cb_test_two_send_and_destroy called %d times", two_send_and_destroy_handler + 1);

	if (geteuid() != 0) {
		T_SKIP("kevent_qos test requires root privileges to run.");
	}

	if (two_send_and_destroy_handler == 0) {
		/* The effective Qos should be the one expected after override */
		T_EXPECT_EFFECTIVE_QOS_EQ(g_expected_qos[ENV_QOS_AFTER_OVERRIDE],
			"dispatch_source event handler QoS should be %s", g_expected_qos_name[ENV_QOS_AFTER_OVERRIDE]);

		sleep(2 * RECV_TIMEOUT_SECS);

		/* Special reply port should have been destroyed, check Qos again */
		T_EXPECT_EFFECTIVE_QOS_EQ(g_expected_qos[ENV_QOS_BEFORE_OVERRIDE],
			"dispatch_source event handler QoS should be %s", g_expected_qos_name[ENV_QOS_BEFORE_OVERRIDE]);

		two_send_and_destroy_test_passed = TRUE;
	} else {
		if (two_send_and_destroy_test_passed) {
			T_END;
		}
	}

	/* Enable the knote to get next message */
	struct kevent_qos_s *kev = *eventslist;
	kev->flags = EV_ADD | EV_ENABLE | EV_UDATA_SPECIFIC | EV_DISPATCH | EV_VANISHED;
	kev->fflags = (MACH_RCV_MSG | MACH_RCV_LARGE | MACH_RCV_LARGE_IDENTITY |
				MACH_RCV_TRAILER_ELEMENTS(MACH_RCV_TRAILER_CTX) |
				MACH_RCV_TRAILER_TYPE(MACH_MSG_TRAILER_FORMAT_0) |
				MACH_RCV_VOUCHER);
	*events = 1;
	two_send_and_destroy_handler++;
	T_LOG("Handler returning \n");
}

#pragma mark Mach receive

#define KEVENT_QOS_SERVICE_NAME "com.apple.xnu.test.kevent_qos"

static mach_port_t
get_server_port(void)
{
	mach_port_t port;
	kern_return_t kr = bootstrap_check_in(bootstrap_port,
			KEVENT_QOS_SERVICE_NAME, &port);
	T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "server bootstrap_check_in");
	return port;
}

static void
env_set_qos(char **env, qos_class_t qos[], const char *qos_name[], const char *wl_function)
{
	int i;
	char *qos_str, *qos_name_str;
	for (i = 0; i < ENV_VAR_QOS; i++) {
		T_QUIET; T_ASSERT_POSIX_SUCCESS(asprintf(&qos_str, "%s=%d", qos_env[i] , qos[i]),
			NULL);
		T_QUIET; T_ASSERT_POSIX_SUCCESS(
			asprintf(&qos_name_str, "%s=%s", qos_name_env[i], qos_name[i]), NULL);
		env[2 * i] = qos_str;
		env[2 * i + 1] = qos_name_str;
	}
	T_QUIET; T_ASSERT_POSIX_SUCCESS(asprintf(&env[2 * i], "%s=%s", wl_function_name, wl_function),
			NULL);
	env[2 * i + 1] = NULL;
}

static void
environ_get_qos(qos_class_t qos[], const char *qos_name[], const char **wl_function)
{
	char *qos_str;
	char *qos_end;
	int i;

	for (i = 0; i < ENV_VAR_QOS; i++) {
		qos_str = getenv(qos_env[i]);
		T_QUIET; T_ASSERT_NOTNULL(qos_str, "getenv(%s)", qos_env[i]);

		unsigned long qos_l = strtoul(qos_str, &qos_end, 10);
		T_QUIET; T_ASSERT_EQ(*qos_end, '\0', "getenv(%s) = '%s' should be an "
				"integer", qos_env[i], qos_str);

		T_QUIET; T_ASSERT_LT(qos_l, (unsigned long)100, "getenv(%s) = '%s' should "
				"be less than 100", qos_env[i], qos_str);

		qos[i] = (qos_class_t)qos_l;
		qos_name[i] = getenv(qos_name_env[i]);
		T_QUIET; T_ASSERT_NOTNULL(qos_name[i], "getenv(%s)", qos_name_env[i]);
	}
	*wl_function = getenv(wl_function_name);
	T_QUIET; T_ASSERT_NOTNULL(*wl_function, "getenv(%s)", wl_function_name);
}

static mach_voucher_t
create_pthpriority_voucher(mach_msg_priority_t qos)
{
	char voucher_buf[sizeof(mach_voucher_attr_recipe_data_t) + sizeof(ipc_pthread_priority_value_t)];

	mach_voucher_t voucher = MACH_PORT_NULL;
	kern_return_t ret;
	ipc_pthread_priority_value_t ipc_pthread_priority_value =
			(ipc_pthread_priority_value_t)qos;

	mach_voucher_attr_raw_recipe_array_t recipes;
	mach_voucher_attr_raw_recipe_size_t recipe_size = 0;
	mach_voucher_attr_recipe_t recipe =
		(mach_voucher_attr_recipe_t)&voucher_buf[recipe_size];

	recipe->key = MACH_VOUCHER_ATTR_KEY_PTHPRIORITY;
	recipe->command = MACH_VOUCHER_ATTR_PTHPRIORITY_CREATE;
	recipe->previous_voucher = MACH_VOUCHER_NULL;
	memcpy((char *)&recipe->content[0], &ipc_pthread_priority_value, sizeof(ipc_pthread_priority_value));
	recipe->content_size = sizeof(ipc_pthread_priority_value_t);
	recipe_size += sizeof(mach_voucher_attr_recipe_data_t) + recipe->content_size;

	recipes = (mach_voucher_attr_raw_recipe_array_t)&voucher_buf[0];

	ret = host_create_mach_voucher(mach_host_self(),
				recipes,
				recipe_size,
				&voucher);

	T_QUIET; T_ASSERT_MACH_SUCCESS(ret, "client host_create_mach_voucher");
	return voucher;
}

static void
send(
	mach_port_t send_port,
	mach_port_t reply_port,
	mach_port_t msg_port,
	mach_msg_priority_t qos)
{
	kern_return_t ret = 0;

	struct {
		mach_msg_header_t header;
		mach_msg_body_t body;
		mach_msg_port_descriptor_t port_descriptor;
	} send_msg = {
	    .header =
		{
		    .msgh_remote_port = send_port,
		    .msgh_local_port  = reply_port,
		    .msgh_bits        = MACH_MSGH_BITS_SET(MACH_MSG_TYPE_COPY_SEND,
			reply_port ? MACH_MSG_TYPE_MAKE_SEND_ONCE : 0,
			MACH_MSG_TYPE_MOVE_SEND,
			MACH_MSGH_BITS_COMPLEX),
		    .msgh_id          = 0x100,
		    .msgh_size        = sizeof(send_msg),
		    .msgh_voucher_port = create_pthpriority_voucher(qos),
		},
	    .body =
		{
		    .msgh_descriptor_count = 1,
		},
	    .port_descriptor =
		{
		    .name = msg_port, .disposition = MACH_MSG_TYPE_MOVE_RECEIVE, .type = MACH_MSG_PORT_DESCRIPTOR,
		},
	};

	if (msg_port == MACH_PORT_NULL) {
		send_msg.body.msgh_descriptor_count = 0;
	}

	ret = mach_msg(&(send_msg.header),
		MACH_SEND_MSG |
		MACH_SEND_TIMEOUT |
		MACH_SEND_OVERRIDE|
		(reply_port ? MACH_SEND_SYNC_OVERRIDE : 0) ,
		send_msg.header.msgh_size,
		0,
		MACH_PORT_NULL,
		0,
		0);

	T_QUIET; T_ASSERT_MACH_SUCCESS(ret, "client mach_msg");
}

static void
receive(
	mach_port_t rcv_port,
	mach_port_t notify_port)
{
	kern_return_t ret = 0;

	struct {
		mach_msg_header_t header;
		mach_msg_body_t body;
		mach_msg_port_descriptor_t port_descriptor;
	} rcv_msg = {
	    .header =
		{
		    .msgh_remote_port = MACH_PORT_NULL,
		    .msgh_local_port  = rcv_port,
		    .msgh_size        = sizeof(rcv_msg),
		},
	};

	T_LOG("Client: Starting sync receive\n");

	ret = mach_msg(&(rcv_msg.header),
		MACH_RCV_MSG |
		MACH_RCV_TIMEOUT |
		MACH_RCV_SYNC_WAIT,
		0,
		rcv_msg.header.msgh_size,
		rcv_port,
		SEND_TIMEOUT_SECS * 1000,
		notify_port);

	if (!(ret == MACH_RCV_TIMED_OUT || ret == MACH_MSG_SUCCESS)) {
		T_ASSERT_FAIL("Sync rcv failed \n");
	}
}

T_HELPER_DECL(qos_get_special_reply_port,
		"Test get_special_reply_port and it's corner cases.")
{
	mach_port_t special_reply_port;
	mach_port_t new_special_reply_port;

	special_reply_port = thread_get_special_reply_port();
	T_QUIET; T_ASSERT_NOTNULL(special_reply_port , "get_thread_special_reply_port");

	new_special_reply_port = thread_get_special_reply_port();
	T_QUIET; T_ASSERT_NOTNULL(new_special_reply_port , "get_thread_special_reply_port");

	mach_port_destroy(mach_task_self(), special_reply_port);
	mach_port_destroy(mach_task_self(), new_special_reply_port);

	new_special_reply_port = thread_get_special_reply_port();
	T_QUIET; T_ASSERT_NOTNULL(new_special_reply_port , "get_thread_special_reply_port");

	T_END;
}

T_HELPER_DECL(qos_client_send_to_intransit,
		"Send synchronous messages to an intransit port")
{
	mach_port_t qos_send_port;
	mach_port_t msg_port;
	mach_port_t special_reply_port;

	kern_return_t kr = bootstrap_look_up(bootstrap_port,
			KEVENT_QOS_SERVICE_NAME, &qos_send_port);
	T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "client bootstrap_look_up");

	special_reply_port = thread_get_special_reply_port();
	T_QUIET; T_ASSERT_NOTNULL(special_reply_port , "get_thread_special_reply_port");

	/* Create a rcv right to send in a msg */
	kr = mach_port_allocate(mach_task_self(),
			MACH_PORT_RIGHT_RECEIVE,
			&msg_port);

	T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "client mach_port_allocate");

	kr = mach_port_insert_right(mach_task_self(),
			msg_port,
			msg_port,
			MACH_MSG_TYPE_MAKE_SEND);

	T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "client mach_port_insert_right");

	/* Send an empty msg on the port to fire the WL thread */
	send(qos_send_port, MACH_PORT_NULL, MACH_PORT_NULL,
		(uint32_t)_pthread_qos_class_encode(g_expected_qos[ENV_QOS_BEFORE_OVERRIDE], 0, 0));

	sleep(SEND_TIMEOUT_SECS);

	/* Send the message with msg port as in-transit port, this msg will not be dequeued */
	send(qos_send_port, MACH_PORT_NULL, msg_port,
		(uint32_t)_pthread_qos_class_encode(g_expected_qos[ENV_QOS_BEFORE_OVERRIDE], 0, 0));

	/* Send the message to the in-transit port, it should override the rcv's workloop */
	send(msg_port, special_reply_port, MACH_PORT_NULL,
		(uint32_t)_pthread_qos_class_encode(g_expected_qos[ENV_QOS_AFTER_OVERRIDE], 0, 0));
	T_LOG("Client done sending messages, now waiting for server to end the test");
	sleep(2 * SEND_TIMEOUT_SECS);

	T_ASSERT_FAIL("client timed out");
}

T_HELPER_DECL(qos_client_send_sync_and_enqueue_rcv,
		"Send synchronous messages and enqueue the rcv right")
{
	mach_port_t qos_send_port;
	mach_port_t msg_port;
	mach_port_t special_reply_port;

	kern_return_t kr = bootstrap_look_up(bootstrap_port,
			KEVENT_QOS_SERVICE_NAME, &qos_send_port);
	T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "client bootstrap_look_up");

	special_reply_port = thread_get_special_reply_port();
	T_QUIET; T_ASSERT_NOTNULL(special_reply_port , "get_thread_special_reply_port");

	/* Create a rcv right to send in a msg */
	kr = mach_port_allocate(mach_task_self(),
			MACH_PORT_RIGHT_RECEIVE,
			&msg_port);

	T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "client mach_port_allocate");

	kr = mach_port_insert_right(mach_task_self(),
			msg_port,
			msg_port,
			MACH_MSG_TYPE_MAKE_SEND);

	T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "client mach_port_insert_right");

	/* Send the message to msg port */
	send(msg_port, special_reply_port, MACH_PORT_NULL,
		(uint32_t)_pthread_qos_class_encode(g_expected_qos[ENV_QOS_AFTER_OVERRIDE], 0, 0));

	/* Send the message with msg port as in-transit port, copyin of in-transit will cause sync override */
	send(qos_send_port, MACH_PORT_NULL, msg_port,
		(uint32_t)_pthread_qos_class_encode(g_expected_qos[ENV_QOS_BEFORE_OVERRIDE], 0, 0));

	T_LOG("Client done sending messages, now waiting for server to end the test");
	sleep(3 * SEND_TIMEOUT_SECS);

	T_ASSERT_FAIL("client timed out");
}

static void
thread_create_at_qos(qos_class_t qos, void * (*function)(void *))
{
	qos_class_t qos_thread;
	pthread_t thread;
        pthread_attr_t attr;
	int ret;

	ret = setpriority(PRIO_DARWIN_ROLE, 0, PRIO_DARWIN_ROLE_UI_FOCAL);
	if (ret != 0) {
		T_LOG("set priority failed\n");
	}

        pthread_attr_init(&attr);
        pthread_attr_set_qos_class_np(&attr, qos, 0);
        pthread_create(&thread, &attr, function, NULL);

	T_LOG("pthread created\n");
	pthread_get_qos_class_np(thread, &qos_thread, NULL);
        T_EXPECT_EQ(qos_thread, (qos_class_t)qos, NULL);
}

static void *
qos_send_and_sync_rcv(void *arg __unused)
{
	mach_port_t qos_send_port;
	mach_port_t special_reply_port;

	T_LOG("Client: from created thread\n");

	T_EXPECT_EFFECTIVE_QOS_EQ(g_expected_qos[ENV_QOS_AFTER_OVERRIDE],
			"pthread QoS should be %s", g_expected_qos_name[ENV_QOS_AFTER_OVERRIDE]);

	kern_return_t kr = bootstrap_look_up(bootstrap_port,
			KEVENT_QOS_SERVICE_NAME, &qos_send_port);
	T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "client bootstrap_look_up");

	special_reply_port = thread_get_special_reply_port();
	T_QUIET; T_ASSERT_NOTNULL(special_reply_port , "get_thread_special_reply_port");

	/* enqueue two messages to make sure that mqueue is not empty */
	send(qos_send_port, MACH_PORT_NULL, MACH_PORT_NULL,
		(uint32_t)_pthread_qos_class_encode(g_expected_qos[ENV_QOS_QUEUE_OVERRIDE], 0, 0));

	send(qos_send_port, MACH_PORT_NULL, MACH_PORT_NULL,
		(uint32_t)_pthread_qos_class_encode(g_expected_qos[ENV_QOS_QUEUE_OVERRIDE], 0, 0));

	sleep(SEND_TIMEOUT_SECS);

	/* sync wait on msg port */
	receive(special_reply_port, qos_send_port);

	T_LOG("Client done doing sync rcv, now waiting for server to end the test");
	sleep(SEND_TIMEOUT_SECS);

	T_ASSERT_FAIL("client timed out");
	return 0;
}

T_HELPER_DECL(qos_client_send_sync_and_sync_rcv,
		"Send messages and syncronously wait for rcv")
{
	thread_create_at_qos(g_expected_qos[ENV_QOS_AFTER_OVERRIDE], qos_send_and_sync_rcv);
	sleep(HELPER_TIMEOUT_SECS);
}

T_HELPER_DECL(qos_client_send_sync_msg,
		"Send synchronous messages")
{
	mach_port_t qos_send_port;
	mach_port_t special_reply_port;

	kern_return_t kr = bootstrap_look_up(bootstrap_port,
			KEVENT_QOS_SERVICE_NAME, &qos_send_port);
	T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "client bootstrap_look_up");

	special_reply_port = thread_get_special_reply_port();
	T_QUIET; T_ASSERT_NOTNULL(special_reply_port , "get_thread_special_reply_port");

	/* Send the message to msg port */
	send(qos_send_port, special_reply_port, MACH_PORT_NULL,
		(uint32_t)_pthread_qos_class_encode(g_expected_qos[ENV_QOS_AFTER_OVERRIDE], 0, 0));

	T_LOG("Client done sending messages, now waiting for server to end the test");
	sleep(2 * SEND_TIMEOUT_SECS);

	T_ASSERT_FAIL("client timed out");
}

T_HELPER_DECL(qos_client_send_two_sync_msg,
		"Send two synchronous messages at different qos")
{
	mach_port_t qos_send_port;
	mach_port_t special_reply_port;

	kern_return_t kr = bootstrap_look_up(bootstrap_port,
			KEVENT_QOS_SERVICE_NAME, &qos_send_port);
	T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "client bootstrap_look_up");

	special_reply_port = thread_get_special_reply_port();
	T_QUIET; T_ASSERT_NOTNULL(special_reply_port , "get_thread_special_reply_port");

	/* Send the message to msg port */
	send(qos_send_port, special_reply_port, MACH_PORT_NULL,
		(uint32_t)_pthread_qos_class_encode(g_expected_qos[ENV_QOS_AFTER_OVERRIDE], 0, 0));

	/* Send the message to msg port */
	send(qos_send_port, special_reply_port, MACH_PORT_NULL,
		(uint32_t)_pthread_qos_class_encode(g_expected_qos[ENV_QOS_BEFORE_OVERRIDE], 0, 0));

	T_LOG("Client done sending messages, now waiting for server to end the test");
	sleep(SEND_TIMEOUT_SECS);

	T_ASSERT_FAIL("client timed out");
}

T_HELPER_DECL(qos_client_send_two_msg_and_destroy,
		"Send two messages with 2nd one as sync and then destory the special reply port")
{
	mach_port_t qos_send_port;
	mach_port_t special_reply_port;

	kern_return_t kr = bootstrap_look_up(bootstrap_port,
			KEVENT_QOS_SERVICE_NAME, &qos_send_port);
	T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "client bootstrap_look_up");

	special_reply_port = thread_get_special_reply_port();
	T_QUIET; T_ASSERT_NOTNULL(special_reply_port , "get_thread_special_reply_port");

	/* Send an async message to msg port */
	send(qos_send_port, MACH_PORT_NULL, MACH_PORT_NULL,
		(uint32_t)_pthread_qos_class_encode(g_expected_qos[ENV_QOS_AFTER_OVERRIDE], 0, 0));

	/* Send the message to msg port */
	send(qos_send_port, special_reply_port, MACH_PORT_NULL,
		(uint32_t)_pthread_qos_class_encode(g_expected_qos[ENV_QOS_AFTER_OVERRIDE], 0, 0));

	T_LOG("Client done sending messages, waiting for destroy the special reply_port");
	sleep(SEND_TIMEOUT_SECS);

	mach_port_destroy(mach_task_self(), special_reply_port);
	sleep(SEND_TIMEOUT_SECS);

	T_ASSERT_FAIL("client timed out");
}

static void
run_client_server(const char *server_name, const char *client_name, qos_class_t qos[],
		const char *qos_name[], const char *wl_function)
{
	char *env[2 * ENV_VAR_QOS + ENV_VAR_FUNCTION + 1];
	env_set_qos(env, qos, qos_name, wl_function);

	for (int i = 0; i < ENV_VAR_QOS; i++) {
		g_expected_qos[i] = qos[i];
		g_expected_qos_name[i] = qos_name[i];
	}

	dt_helper_t helpers[] = {
		dt_launchd_helper_env("com.apple.xnu.test.kevent_qos.plist",
				server_name, env),
		dt_fork_helper(client_name)
	};
	dt_run_helpers(helpers, 2, HELPER_TIMEOUT_SECS);
}

#pragma mark Mach receive - kevent_qos


static void
expect_kevent_id_recv(mach_port_t port, qos_class_t qos[], const char *qos_name[], const char *wl_function)
{
	int r;

	/* Qos expected by workloop thread */
	for (int i = 0; i < ENV_VAR_QOS; i++) {
		g_expected_qos[i] = qos[i];
		g_expected_qos_name[i] = qos_name[i];
	}

	if (strcmp(wl_function, "workloop_cb_test_intransit") == 0) {
		T_QUIET; T_ASSERT_POSIX_ZERO(_pthread_workqueue_init_with_workloop(
			worker_cb, event_cb,
			(pthread_workqueue_function_workloop_t)workloop_cb_test_intransit, 0, 0), NULL);
	} else if (strcmp(wl_function, "workloop_cb_test_sync_send") == 0) {
		T_QUIET; T_ASSERT_POSIX_ZERO(_pthread_workqueue_init_with_workloop(
			worker_cb, event_cb,
			(pthread_workqueue_function_workloop_t)workloop_cb_test_sync_send, 0, 0), NULL);
	} else if (strcmp(wl_function, "workloop_cb_test_sync_send_and_enable") == 0) {
		T_QUIET; T_ASSERT_POSIX_ZERO(_pthread_workqueue_init_with_workloop(
			worker_cb, event_cb,
			(pthread_workqueue_function_workloop_t)workloop_cb_test_sync_send_and_enable, 0, 0), NULL);
	} else if (strcmp(wl_function, "workloop_cb_test_send_two_sync") == 0) {
		T_QUIET; T_ASSERT_POSIX_ZERO(_pthread_workqueue_init_with_workloop(
			worker_cb, event_cb,
			(pthread_workqueue_function_workloop_t)workloop_cb_test_send_two_sync, 0, 0), NULL);
	} else if (strcmp(wl_function, "workloop_cb_test_two_send_and_destroy") == 0) {
		T_QUIET; T_ASSERT_POSIX_ZERO(_pthread_workqueue_init_with_workloop(
			worker_cb, event_cb,
			(pthread_workqueue_function_workloop_t)workloop_cb_test_two_send_and_destroy, 0, 0), NULL);
	} else {
		T_ASSERT_FAIL("no workloop function specified \n");
	}

	struct kevent_qos_s kev[] = {{
		.ident = port,
		.filter = EVFILT_MACHPORT,
		.flags = EV_ADD | EV_UDATA_SPECIFIC | EV_DISPATCH | EV_VANISHED,
		.fflags = (MACH_RCV_MSG | MACH_RCV_LARGE | MACH_RCV_LARGE_IDENTITY |
				MACH_RCV_TRAILER_ELEMENTS(MACH_RCV_TRAILER_CTX) |
				MACH_RCV_TRAILER_TYPE(MACH_MSG_TRAILER_FORMAT_0) |
				MACH_RCV_VOUCHER),
		.data = 1,
		.qos = (int32_t)_pthread_qos_class_encode(qos[ENV_QOS_QUEUE_OVERRIDE], 0, 0)
	}};

	struct kevent_qos_s kev_err[] = {{ 0 }};

	/* Setup workloop for mach msg rcv */
	r = kevent_id(25, kev, 1, kev_err, 1, NULL,
			NULL, KEVENT_FLAG_WORKLOOP | KEVENT_FLAG_ERROR_EVENTS);

	T_QUIET; T_ASSERT_POSIX_SUCCESS(r, "kevent_id");
	T_QUIET; T_ASSERT_EQ(r, 0, "no errors returned from kevent_id");
	sleep(HELPER_TIMEOUT_SECS);
}

T_HELPER_DECL(server_kevent_id,
		"Reply with the QoS that a dispatch source event handler ran with")
{
	qos_class_t qos[ENV_VAR_QOS];
	const char *qos_name[ENV_VAR_QOS];
	const char *wl_function;
	environ_get_qos(qos, qos_name, &wl_function);

	expect_kevent_id_recv(get_server_port(), qos, qos_name, wl_function);
	sleep(HELPER_TIMEOUT_SECS);
	T_ASSERT_FAIL("should receive a message within %d seconds",
			RECV_TIMEOUT_SECS);
}

#define TEST_QOS(server_name, client_name, name, wl_function_name, qos_bo, qos_bo_name, qos_qo, qos_qo_name, qos_ao, qos_ao_name) \
	T_DECL(server_kevent_id_##name, \
			"Event delivery at " qos_ao_name " QoS using a kevent_id", \
			T_META_ASROOT(YES)) \
	{ \
		qos_class_t qos_array[ENV_VAR_QOS] = {qos_bo, qos_qo, qos_ao};	\
		const char *qos_name_array[ENV_VAR_QOS] = {qos_bo_name, qos_qo_name, qos_ao_name}; \
		run_client_server(server_name, client_name, qos_array, qos_name_array, wl_function_name); \
	}

/*
 * Test 1: Test special reply port SPI
 *
 * Create thread special reply port and check any subsequent calls to
 * the same should return MACH_PORT_NULL, unless the reply port is destroyed.
 */
TEST_QOS("server_kevent_id", "qos_get_special_reply_port", special_reply_port, "workloop_cb_test_intransit",
	QOS_CLASS_DEFAULT, "default",
	QOS_CLASS_DEFAULT, "default",
	QOS_CLASS_DEFAULT, "default")

/*
 * Test 2: Test sync ipc send to an in-transit port
 *
 * Send a sync ipc message (at IN qos) to an in-transit port enqueued in a port
 * attached to a workloop. Test that the servicer of the workloop gets
 * sync ipc override.
 */
TEST_QOS("server_kevent_id", "qos_client_send_to_intransit", transit_IN, "workloop_cb_test_intransit",
	QOS_CLASS_DEFAULT, "default",
	QOS_CLASS_MAINTENANCE, "maintenance",
	QOS_CLASS_USER_INITIATED, "user initiated")

/*
 * Test 3: Test sync ipc send to an in-transit port
 *
 * Send a sync ipc message (at UI qos) to an in-transit port enqueued in a port
 * attached to a workloop. Test that the servicer of the workloop gets
 * sync ipc override.
 */
TEST_QOS("server_kevent_id", "qos_client_send_to_intransit", transit_UI, "workloop_cb_test_intransit",
	QOS_CLASS_USER_INITIATED, "user initiated",
	QOS_CLASS_MAINTENANCE, "maintenance",
	QOS_CLASS_USER_INTERACTIVE, "user interactive")

/*
 * Test 4: Test enqueue of a receive right having sync ipc override
 *
 * Enqueue a receive right which has a sync ipc override (at IN qos)
 * and test that servicer of the workloop on other side gets sync ipc
 * override.
 */
TEST_QOS("server_kevent_id", "qos_client_send_sync_and_enqueue_rcv", enqueue_IN, "workloop_cb_test_intransit",
	QOS_CLASS_DEFAULT, "default",
	QOS_CLASS_MAINTENANCE, "maintenance",
	QOS_CLASS_USER_INITIATED, "user initiated")

/*
 * Test 5: Test enqueue of a receive right having sync ipc override
 *
 * Enqueue a receive right which has a sync ipc override (at UI qos)
 * and test that servicer of the workloop on other side gets sync ipc
 * override.
 */
TEST_QOS("server_kevent_id", "qos_client_send_sync_and_enqueue_rcv", enqueue_UI, "workloop_cb_test_intransit",
	QOS_CLASS_DEFAULT, "default",
	QOS_CLASS_MAINTENANCE, "maintenance",
	QOS_CLASS_USER_INTERACTIVE, "user interactive")

/*
 * Test 6: Test starting a sync rcv overrides the servicer
 *
 * Send an async message to a port and then start waiting on
 * the port in mach msg rcv (at IN qos) with sync wait and test if the
 * servicer of the workloop gets sync ipc override.
 */
TEST_QOS("server_kevent_id", "qos_client_send_sync_and_sync_rcv", rcv_IN, "workloop_cb_test_intransit",
	QOS_CLASS_DEFAULT, "default",
	QOS_CLASS_MAINTENANCE, "maintenance",
	QOS_CLASS_USER_INITIATED, "user initiated")

/*
 * Test 7: Test starting a sync rcv overrides the servicer
 *
 * Send an async message to a port and then start waiting on
 * the port in mach msg rcv (at UI qos) with sync wait and test if the
 * servicer of the workloop gets sync ipc override.
 */
TEST_QOS("server_kevent_id", "qos_client_send_sync_and_sync_rcv", rcv_UI, "workloop_cb_test_intransit",
	QOS_CLASS_DEFAULT, "default",
	QOS_CLASS_MAINTENANCE, "maintenance",
	QOS_CLASS_USER_INTERACTIVE, "user interactive")

/*
 * Test 8: test sending sync ipc message (at IN qos) to port will override the servicer
 *
 * Send a message with sync ipc override to a port and check if the servicer
 * of the workloop on other side gets sync ipc override.
 */
TEST_QOS("server_kevent_id", "qos_client_send_sync_msg", send_sync_IN, "workloop_cb_test_sync_send",
	QOS_CLASS_DEFAULT, "default",
	QOS_CLASS_MAINTENANCE, "maintenance",
	QOS_CLASS_USER_INITIATED, "user initiated")

/*
 * Test 9: test sending sync ipc message (at UI qos) to port will override the servicer
 *
 * Send a message with sync ipc override to a port and check if the servicer
 * of the workloop on other side gets sync ipc override.
 */
TEST_QOS("server_kevent_id", "qos_client_send_sync_msg", send_sync_UI, "workloop_cb_test_sync_send",
	QOS_CLASS_USER_INITIATED, "user initiated",
	QOS_CLASS_MAINTENANCE, "maintenance",
	QOS_CLASS_USER_INTERACTIVE, "user interactive")

/*
 * Test 10: test enabling a knote in workloop handler will drop the sync ipc override of delivered message
 *
 * Send a sync ipc message to port and check the servicer of the workloop
 * on other side gets sync ipc override and once the handler enables the knote,
 * that sync ipc override is dropped.
 */
TEST_QOS("server_kevent_id", "qos_client_send_sync_msg", send_sync_UI_and_enable, "workloop_cb_test_sync_send_and_enable",
	QOS_CLASS_USER_INITIATED, "user initiated",
	QOS_CLASS_MAINTENANCE, "maintenance",
	QOS_CLASS_USER_INTERACTIVE, "user interactive")

/*
 * Test 11: test returning to begin processing drops sync ipc override of delivered message
 *
 * Send a sync ipc message and check if enabling the knote clears the override of
 * the delivered message, but should still have the override of an enqueued message.
 */
TEST_QOS("server_kevent_id", "qos_client_send_two_sync_msg", send_two_sync_UI, "workloop_cb_test_send_two_sync",
	QOS_CLASS_USER_INITIATED, "user initiated",
	QOS_CLASS_MAINTENANCE, "maintenance",
	QOS_CLASS_USER_INTERACTIVE, "user interactive")

/*
 * Test 12: test destorying the special reply port drops the override
 *
 * Send two async messages and a sync ipc message, the workloop handler
 * should get a sync ipc override, now test if destroying the special
 * reply port drops the sync ipc override on the servicer.
 */
TEST_QOS("server_kevent_id", "qos_client_send_two_msg_and_destroy", send_two_UI_and_destroy, "workloop_cb_test_two_send_and_destroy",
	QOS_CLASS_USER_INITIATED, "user initiated",
	QOS_CLASS_MAINTENANCE, "maintenance",
	QOS_CLASS_USER_INTERACTIVE, "user interactive")