[PATCH liburing 3/4] test: test clockids and abs timeouts

[Pavel Begunkov <asml.silence@gmail.com>]

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 test/Makefile       |   1 +
 test/wait-timeout.c | 283 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 284 insertions(+)
 create mode 100644 test/wait-timeout.c

diff --git a/test/Makefile b/test/Makefile
index 0538a75..f4fccd7 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -213,6 +213,7 @@ test_srcs := \
 	unlink.c \
 	version.c \
 	waitid.c \
+	wait-timeout.c \
 	wakeup-hang.c \
 	wq-aff.c \
 	xattr.c \
diff --git a/test/wait-timeout.c b/test/wait-timeout.c
new file mode 100644
index 0000000..1fc8e28
--- /dev/null
+++ b/test/wait-timeout.c
@@ -0,0 +1,283 @@
+/* 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 <sys/wait.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <assert.h>
+
+#include "helpers.h"
+#include "liburing.h"
+#include "../src/syscall.h"
+
+#define IO_NSEC_PER_SEC			1000000000LU
+
+static bool support_abs = false;
+static bool support_clock = false;
+
+static unsigned long long timespec_to_ns(struct timespec *ts)
+{
+	return ts->tv_nsec + ts->tv_sec * IO_NSEC_PER_SEC;
+}
+static struct timespec ns_to_timespec(unsigned long long t)
+{
+	struct timespec ts;
+
+	ts.tv_sec = t / IO_NSEC_PER_SEC;
+	ts.tv_nsec = t - ts.tv_sec * IO_NSEC_PER_SEC;
+	return ts;
+}
+
+static long long ns_since(struct timespec *ts)
+{
+	struct timespec now;
+	int ret;
+
+	ret = clock_gettime(CLOCK_MONOTONIC, &now);
+	if (ret) {
+		fprintf(stderr, "clock_gettime failed\n");
+		exit(T_EXIT_FAIL);
+	}
+
+	return timespec_to_ns(&now) - timespec_to_ns(ts);
+
+}
+
+static int t_io_uring_wait(struct io_uring *ring, int nr, unsigned enter_flags,
+			   struct timespec *ts)
+{
+	struct io_uring_getevents_arg arg = {
+		.sigmask	= 0,
+		.sigmask_sz	= _NSIG / 8,
+		.ts		= (unsigned long)ts
+	};
+	int ret;
+
+	enter_flags |= IORING_ENTER_GETEVENTS | IORING_ENTER_EXT_ARG;
+	ret = io_uring_enter2(ring->ring_fd, 0, nr, enter_flags,
+			      (void *)&arg, sizeof(arg));
+	return ret;
+}
+
+static int probe_timers(void)
+{
+	struct io_uring_clock_register cr = { .clockid = CLOCK_MONOTONIC, };
+	struct io_uring ring;
+	struct timespec ts;
+	int ret;
+
+	ret = io_uring_queue_init(8, &ring, 0);
+	if (ret) {
+		fprintf(stderr, "probe ring setup failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = clock_gettime(CLOCK_MONOTONIC, &ts);
+	if (ret) {
+		fprintf(stderr, "clock_gettime failed\n");
+		return ret;
+	}
+
+	ret = t_io_uring_wait(&ring, 0, IORING_ENTER_ABS_TIMER, &ts);
+	if (!ret) {
+		support_abs = true;
+	} else if (ret != -EINVAL) {
+		fprintf(stderr, "wait failed %i\n", ret);
+		return ret;
+	}
+
+	ret = io_uring_register_clock(&ring, &cr);
+	if (!ret) {
+		support_clock = true;
+	} else if (ret != -EINVAL) {
+		fprintf(stderr, "io_uring_register_clock %i\n", ret);
+		return ret;
+	}
+
+	io_uring_queue_exit(&ring);
+	return 0;
+}
+
+static int test_timeout(bool abs, bool set_clock)
+{
+	unsigned enter_flags = abs ? IORING_ENTER_ABS_TIMER : 0;
+	struct io_uring ring;
+	struct timespec start, end, ts;
+	long long dt;
+	int ret;
+
+	ret = io_uring_queue_init(8, &ring, 0);
+	if (ret) {
+		fprintf(stderr, "ring setup failed: %d\n", ret);
+		return 1;
+	}
+
+	if (set_clock) {
+		struct io_uring_clock_register cr = {};
+
+		cr.clockid = CLOCK_BOOTTIME;
+		ret = io_uring_register_clock(&ring, &cr);
+		if (ret) {
+			fprintf(stderr, "io_uring_register_clock failed\n");
+			return 1;
+		}
+	}
+
+	/* pass current time */
+	ret = clock_gettime(CLOCK_MONOTONIC, &start);
+	assert(ret == 0);
+
+	ts = abs ? start : ns_to_timespec(0);
+	ret = t_io_uring_wait(&ring, 1, enter_flags, &ts);
+	if (ret != -ETIME) {
+		fprintf(stderr, "wait current time failed, %i\n", ret);
+		return 1;
+	}
+
+	if (ns_since(&start) >= IO_NSEC_PER_SEC) {
+		fprintf(stderr, "current time test failed\n");
+		return 1;
+	}
+
+	if (abs) {
+		/* expired time */
+		ret = clock_gettime(CLOCK_MONOTONIC, &start);
+		assert(ret == 0);
+		ts = ns_to_timespec(timespec_to_ns(&start) - IO_NSEC_PER_SEC);
+
+		ret = t_io_uring_wait(&ring, 1, enter_flags, &ts);
+		if (ret != -ETIME) {
+			fprintf(stderr, "expired timeout wait failed, %i\n", ret);
+			return 1;
+		}
+
+		ret = clock_gettime(CLOCK_MONOTONIC, &end);
+		assert(ret == 0);
+
+		if (ns_since(&start) >= IO_NSEC_PER_SEC) {
+			fprintf(stderr, "expired timer test failed\n");
+			return 1;
+		}
+	}
+
+	/* 1s wait */
+	ret = clock_gettime(CLOCK_MONOTONIC, &start);
+	assert(ret == 0);
+
+	dt = 2 * IO_NSEC_PER_SEC + (abs ? timespec_to_ns(&start) : 0);
+	ts = ns_to_timespec(dt);
+	ret = t_io_uring_wait(&ring, 1, enter_flags, &ts);
+	if (ret != -ETIME) {
+		fprintf(stderr, "wait timeout failed, %i\n", ret);
+		return 1;
+	}
+
+	dt = ns_since(&start);
+	if (dt < IO_NSEC_PER_SEC || dt > 3 * IO_NSEC_PER_SEC) {
+		fprintf(stderr, "early wake up, %lld\n", dt);
+		return 1;
+	}
+	return 0;
+}
+
+static int test_clock_setup(void)
+{
+	struct io_uring ring;
+	struct io_uring_clock_register cr = {};
+	int ret;
+
+	ret = io_uring_queue_init(8, &ring, 0);
+	if (ret) {
+		fprintf(stderr, "ring setup failed: %d\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	ret = __sys_io_uring_register(ring.ring_fd, IORING_REGISTER_CLOCK, NULL, 0);
+	if (!ret) {
+		fprintf(stderr, "invalid null clock registration %i\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	cr.clockid = -1;
+	ret = __sys_io_uring_register(ring.ring_fd, IORING_REGISTER_CLOCK, &cr, 0);
+	if (ret != -EINVAL) {
+		fprintf(stderr, "invalid clockid registration %i\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	cr.clockid = CLOCK_MONOTONIC;
+	ret = __sys_io_uring_register(ring.ring_fd, IORING_REGISTER_CLOCK, &cr, 0);
+	if (ret) {
+		fprintf(stderr, "clock monotonic registration failed %i\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	cr.clockid = CLOCK_BOOTTIME;
+	ret = __sys_io_uring_register(ring.ring_fd, IORING_REGISTER_CLOCK, &cr, 0);
+	if (ret) {
+		fprintf(stderr, "clock boottime registration failed %i\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	cr.clockid = CLOCK_MONOTONIC;
+	ret = __sys_io_uring_register(ring.ring_fd, IORING_REGISTER_CLOCK, &cr, 0);
+	if (ret) {
+		fprintf(stderr, "2nd clock monotonic registration failed %i\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	io_uring_queue_exit(&ring);
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	int ret, i;
+
+	if (argc > 1)
+		return 0;
+
+	ret = probe_timers();
+	if (ret) {
+		fprintf(stderr, "probe failed\n");
+		return T_EXIT_FAIL;
+	}
+	if (!support_abs && !support_clock)
+		return T_EXIT_SKIP;
+
+	if (support_clock) {
+		ret = test_clock_setup();
+		if (ret) {
+			fprintf(stderr, "test_clock_setup failed\n");
+			return T_EXIT_FAIL;
+		}
+	}
+
+	for (i = 0; i < 4; i++) {
+		bool abs = i & 1;
+		bool clock = i & 2;
+
+		if (abs && !support_abs)
+			continue;
+		if (clock && !support_clock)
+			continue;
+
+		ret = test_timeout(abs, clock);
+		if (ret) {
+			fprintf(stderr, "test_timeout failed %i %i\n",
+					abs, clock);
+			return ret;
+		}
+	}
+
+	return 0;
+}
-- 
2.45.2