Initial commit

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

test/io_uring-test.c

@@ -0,0 +1,90 @@
+/*
+ * Simple app that demonstrates how to setup an io_uring interface,
+ * submit and complete IO against it, and then tear it down.
+ *
+ * gcc -Wall -O2 -D_GNU_SOURCE -o io_uring-test io_uring-test.c -luring
+ */
+#include <stdio.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "../src/liburing.h"
+
+int main(int argc, char *argv[])
+{
+	struct io_uring_params p;
+	struct io_uring_sq sq;
+	struct io_uring_cq cq;
+	int i, fd, ring_fd, ret, pending, done;
+	struct io_uring_iocb *iocb;
+	struct io_uring_event *ev;
+	off_t offset;
+	void *buf;
+
+	if (argc < 2) {
+		printf("%s: file\n", argv[0]);
+		return 1;
+	}
+
+	memset(&p, 0, sizeof(p));
+	p.flags = IORING_SETUP_IOPOLL;
+
+	ring_fd = io_uring_queue_init(4, &p, NULL, &sq, &cq);
+	if (ring_fd < 0) {
+		fprintf(stderr, "queue_init: %s\n", strerror(-ring_fd));
+		return 1;
+	}
+
+	fd = open(argv[1], O_RDONLY | O_DIRECT);
+	if (fd < 0) {
+		perror("open");
+		return 1;
+	}
+
+	if (posix_memalign(&buf, 4096, 4096))
+		return 1;
+
+	offset = 0;
+	do {
+		iocb = io_uring_get_iocb(&sq);
+		if (!iocb)
+			break;
+		iocb->opcode = IORING_OP_READ;
+		iocb->flags = 0;
+		iocb->ioprio = 0;
+		iocb->fd = fd;
+		iocb->off = offset;
+		iocb->addr = buf;
+		iocb->len = 4096;
+		offset += 4096;
+	} while (1);
+
+	ret = io_uring_submit(ring_fd, &sq);
+	if (ret < 0) {
+		fprintf(stderr, "io_uring_submit: %s\n", strerror(-ret));
+		return 1;
+	}
+
+	done = 0;
+	pending = ret;
+	for (i = 0; i < pending; i++) {
+		ev = NULL;
+		ret = io_uring_get_completion(ring_fd, &cq, &ev);
+		if (ret < 0) {
+			fprintf(stderr, "io_uring_get_completion: %s\n", strerror(-ret));
+			return 1;
+		}
+
+		done++;
+		if (ev->res != 4096) {
+			fprintf(stderr, "ret=%d, wanted 4096\n", ev->res);
+			return 1;
+		}
+	}
+
+	printf("Submitted=%d, completed=%d\n", pending, done);
+	close(fd);
+	io_uring_queue_exit(ring_fd, &sq, &cq);
+	return 0;
+}