githubmirror/liburing

test/timeout.c
1 064 строки22 KB
Jens Axboe
Add SPDX license identifiers
12 фев 2020, 06:34
12 фев 2020, 06:34e502435
/* SPDX-License-Identifier: MIT */
/*
 * Description: run various timeout tests
 *
 */
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/time.h>

#include "liburing.h"
#include "../src/syscall.h"

#define TIMEOUT_MSEC	200
static int not_supported;
static int no_modify;

static void msec_to_ts(struct __kernel_timespec *ts, unsigned int msec)
{
	ts->tv_sec = msec / 1000;
	ts->tv_nsec = (msec % 1000) * 1000000;
}

static unsigned long long mtime_since(const struct timeval *s,
				      const struct timeval *e)
{
	long long sec, usec;

	sec = e->tv_sec - s->tv_sec;
	usec = (e->tv_usec - s->tv_usec);
	if (sec > 0 && usec < 0) {
		sec--;
		usec += 1000000;
	}

	sec *= 1000;
	usec /= 1000;
	return sec + usec;
}

static unsigned long long mtime_since_now(struct timeval *tv)
{
	struct timeval end;

	gettimeofday(&end, NULL);
	return mtime_since(tv, &end);
}

/*
 * Test that we return to userspace if a timeout triggers, even if we
 * don't satisfy the number of events asked for.
 */
static int test_single_timeout_many(struct io_uring *ring)
{
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	unsigned long long exp;
	struct __kernel_timespec ts;
	struct timeval tv;
	int ret;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}

	msec_to_ts(&ts, TIMEOUT_MSEC);
	io_uring_prep_timeout(sqe, &ts, 0, 0);

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	gettimeofday(&tv, NULL);
	ret = __sys_io_uring_enter(ring->ring_fd, 0, 4, IORING_ENTER_GETEVENTS,
					NULL);
	if (ret < 0) {
		fprintf(stderr, "%s: io_uring_enter %d\n", __FUNCTION__, ret);
		goto err;
	}

	ret = io_uring_wait_cqe(ring, &cqe);
	if (ret < 0) {
		fprintf(stderr, "%s: wait completion %d\n", __FUNCTION__, ret);
		goto err;
	}
	ret = cqe->res;
	io_uring_cqe_seen(ring, cqe);
	if (ret == -EINVAL) {
		fprintf(stdout, "Timeout not supported, ignored\n");
		not_supported = 1;
		return 0;
	} else if (ret != -ETIME) {
		fprintf(stderr, "Timeout: %s\n", strerror(-ret));
		goto err;
	}

	exp = mtime_since_now(&tv);
	if (exp >= TIMEOUT_MSEC / 2 && exp <= (TIMEOUT_MSEC * 3) / 2)
		return 0;
	fprintf(stderr, "%s: Timeout seems wonky (got %llu)\n", __FUNCTION__, exp);
err:
	return 1;
}

/*
 * Test numbered trigger of timeout
 */
static int test_single_timeout_nr(struct io_uring *ring)
{
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	struct __kernel_timespec ts;
	int i, ret;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}

	msec_to_ts(&ts, TIMEOUT_MSEC);
	io_uring_prep_timeout(sqe, &ts, 2, 0);

	sqe = io_uring_get_sqe(ring);
	io_uring_prep_nop(sqe);
	io_uring_sqe_set_data(sqe, (void *) 1);
	sqe = io_uring_get_sqe(ring);
	io_uring_prep_nop(sqe);
	io_uring_sqe_set_data(sqe, (void *) 1);

	ret = io_uring_submit_and_wait(ring, 3);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	i = 0;
	while (i < 3) {
		ret = io_uring_wait_cqe(ring, &cqe);
		if (ret < 0) {
			fprintf(stderr, "%s: wait completion %d\n", __FUNCTION__, ret);
			goto err;
		}

		/*
		 * NOP commands have user_data as 1. Check that we get the
		 * two NOPs first, then the successfully removed timout as
		 * the last one.
		 */
		switch (i) {
		case 0:
		case 1:
			if (io_uring_cqe_get_data(cqe) != (void *) 1) {
				fprintf(stderr, "%s: nop not seen as 1 or 2\n", __FUNCTION__);
				goto err;
			}
			break;
		case 2:
			if (io_uring_cqe_get_data(cqe) != NULL) {
				fprintf(stderr, "%s: timeout not last\n", __FUNCTION__);
				goto err;
			}
			break;
		}

		ret = cqe->res;
		io_uring_cqe_seen(ring, cqe);
		if (ret < 0) {
			fprintf(stderr, "Timeout: %s\n", strerror(-ret));
			goto err;
		} else if (ret) {
			fprintf(stderr, "res: %d\n", ret);
			goto err;
		}
		i++;
	};

	return 0;
err:
	return 1;
}

static int test_single_timeout_wait(struct io_uring *ring)
{
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	struct __kernel_timespec ts;
	int i, ret;

	sqe = io_uring_get_sqe(ring);
	io_uring_prep_nop(sqe);
	io_uring_sqe_set_data(sqe, (void *) 1);

	sqe = io_uring_get_sqe(ring);
	io_uring_prep_nop(sqe);
	io_uring_sqe_set_data(sqe, (void *) 1);

	msec_to_ts(&ts, 1000);

	i = 0;
	do {
		ret = io_uring_wait_cqes(ring, &cqe, 2, &ts, NULL);
		if (ret == -ETIME)
			break;
		if (ret < 0) {
			fprintf(stderr, "%s: wait timeout failed: %d\n", __FUNCTION__, ret);
			goto err;
		}

		ret = cqe->res;
		io_uring_cqe_seen(ring, cqe);
		if (ret < 0) {
			fprintf(stderr, "res: %d\n", ret);
			goto err;
		}
		i++;
	} while (1);

	if (i != 2) {
		fprintf(stderr, "got %d completions\n", i);
		goto err;
	}
	return 0;
err:
	return 1;
}

/*
 * Test single timeout waking us up
 */
static int test_single_timeout(struct io_uring *ring)
{
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	unsigned long long exp;
	struct __kernel_timespec ts;
	struct timeval tv;
	int ret;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}

	msec_to_ts(&ts, TIMEOUT_MSEC);
	io_uring_prep_timeout(sqe, &ts, 0, 0);

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	gettimeofday(&tv, NULL);
	ret = io_uring_wait_cqe(ring, &cqe);
	if (ret < 0) {
		fprintf(stderr, "%s: wait completion %d\n", __FUNCTION__, ret);
		goto err;
	}
	ret = cqe->res;
	io_uring_cqe_seen(ring, cqe);
	if (ret == -EINVAL) {
		fprintf(stdout, "%s: Timeout not supported, ignored\n", __FUNCTION__);
		not_supported = 1;
		return 0;
	} else if (ret != -ETIME) {
		fprintf(stderr, "%s: Timeout: %s\n", __FUNCTION__, strerror(-ret));
		goto err;
	}

	exp = mtime_since_now(&tv);
	if (exp >= TIMEOUT_MSEC / 2 && exp <= (TIMEOUT_MSEC * 3) / 2)
		return 0;
	fprintf(stderr, "%s: Timeout seems wonky (got %llu)\n", __FUNCTION__, exp);
err:
	return 1;
}

static int test_single_timeout_remove_notfound(struct io_uring *ring)
{
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	struct __kernel_timespec ts;
	int ret, i;

	if (no_modify)
		return 0;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}

	msec_to_ts(&ts, TIMEOUT_MSEC);
	io_uring_prep_timeout(sqe, &ts, 2, 0);
	sqe->user_data = 1;

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}

	io_uring_prep_timeout_remove(sqe, 2, 0);
	sqe->user_data = 2;

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	/*
	 * We should get two completions. One is our modify request, which should
	 * complete with -ENOENT. The other is the timeout that will trigger after
	 * TIMEOUT_MSEC.
	 */
	for (i = 0; i < 2; i++) {
		ret = io_uring_wait_cqe(ring, &cqe);
		if (ret < 0) {
			fprintf(stderr, "%s: wait completion %d\n", __FUNCTION__, ret);
			goto err;
		}
		if (cqe->user_data == 2) {
			if (cqe->res != -ENOENT) {
				fprintf(stderr, "%s: modify ret %d, wanted ENOENT\n", __FUNCTION__, cqe->res);
				break;
			}
		} else if (cqe->user_data == 1) {
			if (cqe->res != -ETIME) {
				fprintf(stderr, "%s: timeout ret %d, wanted -ETIME\n", __FUNCTION__, cqe->res);
				break;
			}
		}
		io_uring_cqe_seen(ring, cqe);
	}
	return 0;
err:
	return 1;
}

static int test_single_timeout_remove(struct io_uring *ring)
{
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	struct __kernel_timespec ts;
	int ret, i;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}

	msec_to_ts(&ts, TIMEOUT_MSEC);
	io_uring_prep_timeout(sqe, &ts, 0, 0);
	sqe->user_data = 1;

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}

	io_uring_prep_timeout_remove(sqe, 1, 0);
	sqe->user_data = 2;

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	/*
	 * We should have two completions ready. One is for the original timeout
	 * request, user_data == 1, that should have a ret of -ECANCELED. The other
	 * is for our modify request, user_data == 2, that should have a ret of 0.
	 */
	for (i = 0; i < 2; i++) {
		ret = io_uring_wait_cqe(ring, &cqe);
		if (ret < 0) {
			fprintf(stderr, "%s: wait completion %d\n", __FUNCTION__, ret);
			goto err;
		}
		if (no_modify)
			goto seen;
		if (cqe->res == -EINVAL && cqe->user_data == 2) {
			fprintf(stdout, "Timeout modify not supported, ignoring\n");
			no_modify = 1;
			goto seen;
		}
		if (cqe->user_data == 1) {
			if (cqe->res != -ECANCELED) {
				fprintf(stderr, "%s: timeout ret %d, wanted canceled\n", __FUNCTION__, cqe->res);
				break;
			}
		} else if (cqe->user_data == 2) {
			if (cqe->res) {
				fprintf(stderr, "%s: modify ret %d, wanted 0\n", __FUNCTION__, cqe->res);
				break;
			}
		}
seen:
		io_uring_cqe_seen(ring, cqe);
	}
	return 0;
err:
	return 1;
}

/*
 * Test single absolute timeout waking us up
 */
static int test_single_timeout_abs(struct io_uring *ring)
{
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	unsigned long long exp;
	struct __kernel_timespec ts;
	struct timespec abs_ts;
	struct timeval tv;
	int ret;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}

	clock_gettime(CLOCK_MONOTONIC, &abs_ts);
	ts.tv_sec = abs_ts.tv_sec + 1;
	ts.tv_nsec = abs_ts.tv_nsec;
	io_uring_prep_timeout(sqe, &ts, 0, IORING_TIMEOUT_ABS);

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	gettimeofday(&tv, NULL);
	ret = io_uring_wait_cqe(ring, &cqe);
	if (ret < 0) {
		fprintf(stderr, "%s: wait completion %d\n", __FUNCTION__, ret);
		goto err;
	}
	ret = cqe->res;
	io_uring_cqe_seen(ring, cqe);
	if (ret == -EINVAL) {
		fprintf(stdout, "Absolute timeouts not supported, ignored\n");
		return 0;
	} else if (ret != -ETIME) {
		fprintf(stderr, "Timeout: %s\n", strerror(-ret));
		goto err;
	}

	exp = mtime_since_now(&tv);
	if (exp >= 1000 / 2 && exp <= (1000 * 3) / 2)
		return 0;
	fprintf(stderr, "%s: Timeout seems wonky (got %llu)\n", __FUNCTION__, exp);
err:
	return 1;
}

/*
 * Test that timeout is canceled on exit
 */
static int test_single_timeout_exit(struct io_uring *ring)
{
	struct io_uring_sqe *sqe;
	struct __kernel_timespec ts;
	int ret;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}

	msec_to_ts(&ts, 30000);
	io_uring_prep_timeout(sqe, &ts, 0, 0);

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	io_uring_queue_exit(ring);
	return 0;
err:
	io_uring_queue_exit(ring);
	return 1;
}

/*
 * Test multi timeouts waking us up
 */
static int test_multi_timeout(struct io_uring *ring)
{
	struct io_uring_sqe *sqe;
	struct io_uring_cqe *cqe;
	struct __kernel_timespec ts[2];
	unsigned int timeout[2];
	unsigned long long exp;
	struct timeval tv;
	int ret, i;

	/* req_1: timeout req, count = 1, time = (TIMEOUT_MSEC * 2) */
	timeout[0] = TIMEOUT_MSEC * 2;
	msec_to_ts(&ts[0], timeout[0]);
	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_timeout(sqe, &ts[0], 1, 0);
	sqe->user_data = 1;

	/* req_2: timeout req, count = 1, time = TIMEOUT_MSEC */
	timeout[1] = TIMEOUT_MSEC;
	msec_to_ts(&ts[1], timeout[1]);
	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_timeout(sqe, &ts[1], 1, 0);
	sqe->user_data = 2;

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	gettimeofday(&tv, NULL);
	for (i = 0; i < 2; i++) {
		unsigned int time;
		__u64 user_data;

		ret = io_uring_wait_cqe(ring, &cqe);
		if (ret < 0) {
			fprintf(stderr, "%s: wait completion %d\n", __FUNCTION__, ret);
			goto err;
		}

		/*
		 * Both of these two reqs should timeout, but req_2 should
		 * return before req_1.
		 */
		switch (i) {
		case 0:
			user_data = 2;
			time = timeout[1];
			break;
		case 1:
			user_data = 1;
			time = timeout[0];
			break;
		}

		if (cqe->user_data != user_data) {
			fprintf(stderr, "%s: unexpected timeout req %d sequece\n",
				__FUNCTION__, i+1);
			goto err;
		}
		if (cqe->res != -ETIME) {
			fprintf(stderr, "%s: Req %d timeout: %s\n",
				__FUNCTION__, i+1, strerror(cqe->res));
			goto err;
		}
		exp = mtime_since_now(&tv);
		if (exp < time / 2 || exp > (time * 3) / 2) {
			fprintf(stderr, "%s: Req %d timeout seems wonky (got %llu)\n",
				__FUNCTION__, i+1, exp);
			goto err;
		}
		io_uring_cqe_seen(ring, cqe);
	}

	return 0;
err:
	return 1;
}

/*
 * Test multi timeout req with different count
 */
static int test_multi_timeout_nr(struct io_uring *ring)
{
	struct io_uring_sqe *sqe;
	struct io_uring_cqe *cqe;
	struct __kernel_timespec ts;
	int ret, i;

	msec_to_ts(&ts, TIMEOUT_MSEC);

	/* req_1: timeout req, count = 2 */
	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_timeout(sqe, &ts, 2, 0);
	sqe->user_data = 1;

	/* req_2: timeout req, count = 1 */
	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_timeout(sqe, &ts, 1, 0);
	sqe->user_data = 2;

	/* req_3: nop req */
	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_nop(sqe);
	io_uring_sqe_set_data(sqe, (void *) 1);

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	/*
	 * req_2 (count=1) should return without error and req_1 (count=2)
	 * should timeout.
	 */
	for (i = 0; i < 3; i++) {
		ret = io_uring_wait_cqe(ring, &cqe);
		if (ret < 0) {
			fprintf(stderr, "%s: wait completion %d\n", __FUNCTION__, ret);
			goto err;
		}

		switch (i) {
		case 0:
			/* Should be nop req */
			if (io_uring_cqe_get_data(cqe) != (void *) 1) {
				fprintf(stderr, "%s: nop not seen as 1 or 2\n", __FUNCTION__);
				goto err;
			}
			break;
		case 1:
			/* Should be timeout req_2 */
			if (cqe->user_data != 2) {
				fprintf(stderr, "%s: unexpected timeout req %d sequece\n",
					__FUNCTION__, i+1);
				goto err;
			}
			if (cqe->res < 0) {
				fprintf(stderr, "%s: Req %d res %d\n",
					__FUNCTION__, i+1, cqe->res);
				goto err;
			}
			break;
		case 2:
			/* Should be timeout req_1 */
			if (cqe->user_data != 1) {
				fprintf(stderr, "%s: unexpected timeout req %d sequece\n",
					__FUNCTION__, i+1);
				goto err;
			}
			if (cqe->res != -ETIME) {
				fprintf(stderr, "%s: Req %d timeout: %s\n",
					__FUNCTION__, i+1, strerror(cqe->res));
				goto err;
			}
			break;
		}
		io_uring_cqe_seen(ring, cqe);
	}

	return 0;
err:
	return 1;
}

/*
 * Test timeout <link> timeout <drain> timeout
 */
static int test_timeout_flags1(struct io_uring *ring)
{
	struct io_uring_sqe *sqe;
	struct io_uring_cqe *cqe;
	struct __kernel_timespec ts;
	int ret, i;

	msec_to_ts(&ts, TIMEOUT_MSEC);

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_timeout(sqe, &ts, 0, 0);
	sqe->user_data = 1;
	sqe->flags |= IOSQE_IO_LINK;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_timeout(sqe, &ts, 0, 0);
	sqe->user_data = 2;
	sqe->flags |= IOSQE_IO_DRAIN;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_timeout(sqe, &ts, 0, 0);
	sqe->user_data = 3;

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	for (i = 0; i < 3; i++) {
		ret = io_uring_wait_cqe(ring, &cqe);
		if (ret < 0) {
			fprintf(stderr, "%s: wait completion %d\n", __FUNCTION__, ret);
			goto err;
		}

		if (cqe->res == -EINVAL) {
			if (!i)
				fprintf(stdout, "%s: timeout flags not supported\n",
						__FUNCTION__);
			io_uring_cqe_seen(ring, cqe);
			continue;
		}

		switch (cqe->user_data) {
		case 1:
			if (cqe->res != -ETIME) {
				fprintf(stderr, "%s: got %d, wanted %d\n",
						__FUNCTION__, cqe->res, -ETIME);
				goto err;
			}
			break;
		case 2:
			if (cqe->res != -ECANCELED) {
				fprintf(stderr, "%s: got %d, wanted %d\n",
						__FUNCTION__, cqe->res,
						-ECANCELED);
				goto err;
			}
			break;
		case 3:
			if (cqe->res != -ETIME) {
				fprintf(stderr, "%s: got %d, wanted %d\n",
						__FUNCTION__, cqe->res, -ETIME);
				goto err;
			}
			break;
		}
		io_uring_cqe_seen(ring, cqe);
	}

	return 0;
err:
	return 1;
}

/*
 * Test timeout <link> timeout <link> timeout
 */
static int test_timeout_flags2(struct io_uring *ring)
{
	struct io_uring_sqe *sqe;
	struct io_uring_cqe *cqe;
	struct __kernel_timespec ts;
	int ret, i;

	msec_to_ts(&ts, TIMEOUT_MSEC);

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_timeout(sqe, &ts, 0, 0);
	sqe->user_data = 1;
	sqe->flags |= IOSQE_IO_LINK;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_timeout(sqe, &ts, 0, 0);
	sqe->user_data = 2;
	sqe->flags |= IOSQE_IO_LINK;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_timeout(sqe, &ts, 0, 0);
	sqe->user_data = 3;

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	for (i = 0; i < 3; i++) {
		ret = io_uring_wait_cqe(ring, &cqe);
		if (ret < 0) {
			fprintf(stderr, "%s: wait completion %d\n", __FUNCTION__, ret);
			goto err;
		}

		if (cqe->res == -EINVAL) {
			if (!i)
				fprintf(stdout, "%s: timeout flags not supported\n",
						__FUNCTION__);
			io_uring_cqe_seen(ring, cqe);
			continue;
		}

		switch (cqe->user_data) {
		case 1:
			if (cqe->res != -ETIME) {
				fprintf(stderr, "%s: got %d, wanted %d\n",
						__FUNCTION__, cqe->res, -ETIME);
				goto err;
			}
			break;
		case 2:
		case 3:
			if (cqe->res != -ECANCELED) {
				fprintf(stderr, "%s: got %d, wanted %d\n",
						__FUNCTION__, cqe->res,
						-ECANCELED);
				goto err;
			}
			break;
		}
		io_uring_cqe_seen(ring, cqe);
	}

	return 0;
err:
	return 1;
}

/*
 * Test timeout <drain> timeout <link> timeout
 */
static int test_timeout_flags3(struct io_uring *ring)
{
	struct io_uring_sqe *sqe;
	struct io_uring_cqe *cqe;
	struct __kernel_timespec ts;
	int ret, i;

	msec_to_ts(&ts, TIMEOUT_MSEC);

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_timeout(sqe, &ts, 0, 0);
	sqe->user_data = 1;
	sqe->flags |= IOSQE_IO_DRAIN;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_timeout(sqe, &ts, 0, 0);
	sqe->user_data = 2;
	sqe->flags |= IOSQE_IO_LINK;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "%s: get sqe failed\n", __FUNCTION__);
		goto err;
	}
	io_uring_prep_timeout(sqe, &ts, 0, 0);
	sqe->user_data = 3;

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "%s: sqe submit failed: %d\n", __FUNCTION__, ret);
		goto err;
	}

	for (i = 0; i < 3; i++) {
		ret = io_uring_wait_cqe(ring, &cqe);
		if (ret < 0) {
			fprintf(stderr, "%s: wait completion %d\n", __FUNCTION__, ret);
			goto err;
		}

		if (cqe->res == -EINVAL) {
			if (!i)
				fprintf(stdout, "%s: timeout flags not supported\n",
						__FUNCTION__);
			io_uring_cqe_seen(ring, cqe);
			continue;
		}

		switch (cqe->user_data) {
		case 1:
		case 2:
			if (cqe->res != -ETIME) {
				fprintf(stderr, "%s: got %d, wanted %d\n",
						__FUNCTION__, cqe->res, -ETIME);
				goto err;
			}
			break;
		case 3:
			if (cqe->res != -ECANCELED) {
				fprintf(stderr, "%s: got %d, wanted %d\n",
						__FUNCTION__, cqe->res,
						-ECANCELED);
				goto err;
			}
			break;
		}
		io_uring_cqe_seen(ring, cqe);
	}

	return 0;
err:
	return 1;
}


int main(int argc, char *argv[])
{
	struct io_uring ring;
	int ret;

	ret = io_uring_queue_init(8, &ring, 0);
	if (ret) {
		fprintf(stderr, "ring setup failed\n");
		return 1;
	}

	ret = test_single_timeout(&ring);
	if (ret) {
		fprintf(stderr, "test_single_timeout failed\n");
		return ret;
	}
	if (not_supported)
		return 0;

	ret = test_multi_timeout(&ring);
	if (ret) {
		fprintf(stderr, "test_multi_timeout failed\n");
		return ret;
	}

	ret = test_single_timeout_abs(&ring);
	if (ret) {
		fprintf(stderr, "test_single_timeout_abs failed\n");
		return ret;
	}

	ret = test_single_timeout_remove(&ring);
	if (ret) {
		fprintf(stderr, "test_single_timeout_remove failed\n");
		return ret;
	}

	ret = test_single_timeout_remove_notfound(&ring);
	if (ret) {
		fprintf(stderr, "test_single_timeout_remove_notfound failed\n");
		return ret;
	}

	ret = test_single_timeout_many(&ring);
	if (ret) {
		fprintf(stderr, "test_single_timeout_many failed\n");
		return ret;
	}

	ret = test_single_timeout_nr(&ring);
	if (ret) {
		fprintf(stderr, "test_single_timeout_nr failed\n");
		return ret;
	}

	ret = test_multi_timeout_nr(&ring);
	if (ret) {
		fprintf(stderr, "test_multi_timeout_nr failed\n");
		return ret;
	}

	ret = test_timeout_flags1(&ring);
	if (ret) {
		fprintf(stderr, "test_timeout_flags1 failed\n");
		return ret;
	}

	ret = test_timeout_flags2(&ring);
	if (ret) {
		fprintf(stderr, "test_timeout_flags2 failed\n");
		return ret;
	}

	ret = test_timeout_flags3(&ring);
	if (ret) {
		fprintf(stderr, "test_timeout_flags3 failed\n");
		return ret;
	}

	ret = test_single_timeout_wait(&ring);
	if (ret) {
		fprintf(stderr, "test_single_timeout_wait failed\n");
		return ret;
	}

	/*
	 * this test must go last, it kills the ring
	 */
	ret = test_single_timeout_exit(&ring);
	if (ret) {
		fprintf(stderr, "test_single_timeout_exit failed\n");
		return ret;
	}

	return 0;
}