test/fsync: add simple fsync tester

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

test/fsync.c

@@ -0,0 +1,58 @@
+/*
+ * Description: test io_uring fsync handling
+ *
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include "../src/liburing.h"
+
+int main(int argc, char *argv[])
+{
+	struct io_uring_cqe *cqe;
+	struct io_uring_sqe *sqe;
+	struct io_uring ring;
+	char buf[32];
+	int fd, ret;
+
+	sprintf(buf, "./XXXXXX");
+	fd = mkstemp(buf);
+	if (fd < 0) {
+		perror("open");
+		return 1;
+	}
+	
+	ret = io_uring_queue_init(1, &ring, 0);
+	if (ret) {
+		printf("ring setup failed\n");
+		return 1;
+
+	}
+
+	sqe = io_uring_get_sqe(&ring);
+	if (!sqe) {
+		printf("get sqe failed\n");
+		return 1;
+	}
+
+	io_uring_prep_fsync(sqe, fd, 0);
+
+	ret = io_uring_submit(&ring);
+	if (ret <= 0) {
+		printf("child: sqe submit failed\n");
+		return 1;
+	}
+
+	ret = io_uring_wait_completion(&ring, &cqe);
+	if (ret < 0) {
+		printf("child: wait completion %d\n", ret);
+		return 1;
+	}
+
+	unlink(buf);
+	return 0;
+}