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authorJens Axboe <axboe@kernel.dk>2019-01-08 06:51:07 -0700
committerJens Axboe <axboe@kernel.dk>2019-01-08 07:38:15 -0700
commitf93c84e1b07474a7d776403b3516feeff4f3c933 (patch)
tree4b71b6a4013c643d669398fdb8f33f74b6081cd2 /test
Initial commit
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'test')
-rw-r--r--test/io_uring-test.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/test/io_uring-test.c b/test/io_uring-test.c
new file mode 100644
index 0000000..d945f48
--- /dev/null
+++ b/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;
+}