test/eventfd-reg.c: add basic test case to exercise reg+unreg

Signed-off-by: Jens Axboe <axboe@kernel.dk>

3 files changed, 78 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index 6057951..15559ab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -48,6 +48,7 @@
 /test/empty-eownerdead
 /test/eventfd
 /test/eventfd-disable
+/test/eventfd-reg
 /test/eventfd-ring
 /test/exit-no-cleanup
 /test/fadvise
diff --git a/test/Makefile b/test/Makefile
index b74ba06..1e318f7 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -65,6 +65,7 @@ test_srcs := \
 	empty-eownerdead.c \
 	eventfd.c \
 	eventfd-disable.c \
+	eventfd-reg.c \
 	eventfd-ring.c \
 	exec-target.c \
 	exit-no-cleanup.c \
diff --git a/test/eventfd-reg.c b/test/eventfd-reg.c
new file mode 100644
index 0000000..c708a51
--- /dev/null
+++ b/test/eventfd-reg.c
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Description: test eventfd registration+unregistration
+ *
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/poll.h>
+#include <sys/eventfd.h>
+
+#include "liburing.h"
+
+int main(int argc, char *argv[])
+{
+	struct io_uring_params p = {};
+	struct io_uring ring;
+	int ret, evfd[2], i;
+
+	if (argc > 1)
+		return 0;
+
+	ret = io_uring_queue_init_params(8, &ring, &p);
+	if (ret) {
+		fprintf(stderr, "ring setup failed: %d\n", ret);
+		return 1;
+	}
+
+	evfd[0] = eventfd(0, EFD_CLOEXEC);
+	evfd[1] = eventfd(0, EFD_CLOEXEC);
+	if (evfd[0] < 0 || evfd[1] < 0) {
+		perror("eventfd");
+		return 1;
+	}
+
+	ret = io_uring_register_eventfd(&ring, evfd[0]);
+	if (ret) {
+		fprintf(stderr, "failed to register evfd: %d\n", ret);
+		return 1;
+	}
+
+	/* Check that registrering again will get -EBUSY */
+	ret = io_uring_register_eventfd(&ring, evfd[1]);
+	if (ret != -EBUSY) {
+		fprintf(stderr, "unexpected 2nd register: %d\n", ret);
+		return 1;
+	}
+	close(evfd[1]);
+
+	ret = io_uring_unregister_eventfd(&ring);
+	if (ret) {
+		fprintf(stderr, "unexpected unregister: %d\n", ret);
+		return 1;
+	}
+
+	/* loop 100 registers/unregister */
+	for (i = 0; i < 100; i++) {
+		ret = io_uring_register_eventfd(&ring, evfd[0]);
+		if (ret) {
+			fprintf(stderr, "failed to register evfd: %d\n", ret);
+			return 1;
+		}
+
+		ret = io_uring_unregister_eventfd(&ring);
+		if (ret) {
+			fprintf(stderr, "unexpected unregister: %d\n", ret);
+			return 1;
+		}
+	}
+
+	close(evfd[0]);
+	return 0;
+}