[PATCH liburing v2 2/2] tests: test IORING_SETUP_SINGLE_ISSUER

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

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 test/Makefile        |   1 +
 test/single-issuer.c | 153 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 154 insertions(+)
 create mode 100644 test/single-issuer.c

diff --git a/test/Makefile b/test/Makefile
index e958a35..8945368 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -174,6 +174,7 @@ test_srcs := \
 	wakeup-hang.c \
 	xattr.c \
 	skip-cqe.c \
+	single-issuer.c \
 	# EOL
 
 all_targets :=
diff --git a/test/single-issuer.c b/test/single-issuer.c
new file mode 100644
index 0000000..3bbc6c4
--- /dev/null
+++ b/test/single-issuer.c
@@ -0,0 +1,153 @@
+/* SPDX-License-Identifier: MIT */
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <error.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include "liburing.h"
+#include "test.h"
+#include "helpers.h"
+
+static pid_t pid;
+
+static pid_t fork_t(void)
+{
+	pid = fork();
+	if (pid == -1) {
+		fprintf(stderr, "fork failed\n");
+		exit(T_EXIT_FAIL);
+	}
+	return pid;
+}
+
+static void wait_child_t(void)
+{
+	int wstatus;
+
+	if (waitpid(pid, &wstatus, 0) == (pid_t)-1) {
+		perror("waitpid()");
+		exit(T_EXIT_FAIL);
+	}
+	if (!WIFEXITED(wstatus)) {
+		fprintf(stderr, "child failed %i\n", WEXITSTATUS(wstatus));
+		exit(T_EXIT_FAIL);
+	}
+	if (WEXITSTATUS(wstatus))
+		exit(T_EXIT_FAIL);
+}
+
+static int try_submit(struct io_uring *ring)
+{
+	struct io_uring_cqe *cqe;
+	struct io_uring_sqe *sqe;
+	int ret;
+
+	sqe = io_uring_get_sqe(ring);
+	io_uring_prep_nop(sqe);
+	sqe->user_data = 42;
+
+	ret = io_uring_submit(ring);
+	if (ret < 0)
+		return ret;
+
+	if (ret != 1)
+		error(1, ret, "submit %i", ret);
+	ret = io_uring_wait_cqe(ring, &cqe);
+	if (ret)
+		error(1, ret, "wait fail %i", ret);
+
+	if (cqe->res || cqe->user_data != 42)
+		error(1, ret, "invalid cqe");
+
+	io_uring_cqe_seen(ring, cqe);
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	struct io_uring ring;
+	int ret;
+
+	if (argc > 1)
+		return T_EXIT_SKIP;
+
+	ret = io_uring_queue_init(8, &ring, IORING_SETUP_SINGLE_ISSUER);
+	if (ret == -EINVAL) {
+		fprintf(stderr, "SETUP_SINGLE_ISSUER is not supported, skip\n");
+		return T_EXIT_SKIP;
+	} else if (ret) {
+		fprintf(stderr, "io_uring_queue_init() failed %i\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	/* test that the creator iw allowed to submit */
+	ret = try_submit(&ring);
+	if (ret) {
+		fprintf(stderr, "the creater can't submit %i\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	/* test that a second submitter doesn't succeed */
+	if (!fork_t()) {
+		ret = try_submit(&ring);
+		if (ret != -EEXIST)
+			fprintf(stderr, "not owner child could submit %i\n", ret);
+		return ret != -EEXIST;
+	}
+	wait_child_t();
+	io_uring_queue_exit(&ring);
+
+	/* test that the first submitter but not creator can submit */
+	ret = io_uring_queue_init(8, &ring, IORING_SETUP_SINGLE_ISSUER);
+	if (ret)
+		error(1, ret, "ring init (2) %i", ret);
+
+	if (!fork_t()) {
+		ret = try_submit(&ring);
+		if (ret)
+			fprintf(stderr, "not owner child could submit %i\n", ret);
+		return !!ret;
+	}
+	wait_child_t();
+	io_uring_queue_exit(&ring);
+
+	/* test that anyone can submit to a SQPOLL|SINGLE_ISSUER ring */
+	ret = io_uring_queue_init(8, &ring, IORING_SETUP_SINGLE_ISSUER|IORING_SETUP_SQPOLL);
+	if (ret)
+		error(1, ret, "ring init (3) %i", ret);
+
+	ret = try_submit(&ring);
+	if (ret) {
+		fprintf(stderr, "SQPOLL submit failed (creator) %i\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	if (!fork_t()) {
+		ret = try_submit(&ring);
+		if (ret)
+			fprintf(stderr, "SQPOLL submit failed (child) %i\n", ret);
+		return !!ret;
+	}
+	wait_child_t();
+	io_uring_queue_exit(&ring);
+
+	/* test that IORING_ENTER_REGISTERED_RING doesn't break anything */
+	ret = io_uring_queue_init(8, &ring, IORING_SETUP_SINGLE_ISSUER);
+	if (ret)
+		error(1, ret, "ring init (4) %i", ret);
+
+	if (!fork_t()) {
+		ret = try_submit(&ring);
+		if (ret)
+			fprintf(stderr, "not owner child could submit %i\n", ret);
+		return !!ret;
+	}
+	wait_child_t();
+	io_uring_queue_exit(&ring);
+	return T_EXIT_PASS;
+}
-- 
2.37.0