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#define _LARGEFILE_SOURCE
#define _FILE_OFFSET_BITS 64
#include <liburing.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/resource.h>
#include <unistd.h>
static const int RSIZE = 2;
static const int OPEN_FLAGS = O_RDWR | O_CREAT;
static const mode_t OPEN_MODE = S_IRUSR | S_IWUSR;
#define DIE(...) do {\
fprintf(stderr, __VA_ARGS__);\
abort();\
} while(0);
static int do_write(struct io_uring *ring, int fd, off_t offset)
{
char buf[] = "some test write buf";
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
int res, ret;
sqe = io_uring_get_sqe(ring);
if (!sqe) {
fprintf(stderr, "failed to get sqe\n");
return 1;
}
io_uring_prep_write(sqe, fd, buf, sizeof(buf), offset);
ret = io_uring_submit(ring);
if (ret < 0) {
fprintf(stderr, "failed to submit write: %s\n", strerror(-ret));
return 1;
}
ret = io_uring_wait_cqe(ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait_cqe failed: %s\n", strerror(-ret));
return 1;
}
res = cqe->res;
io_uring_cqe_seen(ring, cqe);
if (res < 0) {
fprintf(stderr, "write failed: %s\n", strerror(-res));
return 1;
}
return 0;
}
static int test_open_write(struct io_uring *ring, int dfd, const char *fn)
{
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
int ret, fd = -1;
sqe = io_uring_get_sqe(ring);
if (!sqe) {
fprintf(stderr, "failed to get sqe\n");
return 1;
}
io_uring_prep_openat(sqe, dfd, fn, OPEN_FLAGS, OPEN_MODE);
ret = io_uring_submit(ring);
if (ret < 0) {
fprintf(stderr, "failed to submit openat: %s\n", strerror(-ret));
return 1;
}
ret = io_uring_wait_cqe(ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait_cqe failed: %s\n", strerror(-ret));
return 1;
}
fd = cqe->res;
io_uring_cqe_seen(ring, cqe);
if (fd < 0) {
fprintf(stderr, "openat failed: %s\n", strerror(-fd));
return 1;
}
return do_write(ring, fd, 1ULL << 32);
}
int main(int argc, char *argv[])
{
struct io_uring ring;
int dfd, ret;
if (argc > 1)
return 0;
dfd = open("/tmp", O_RDONLY | O_DIRECTORY);
if (dfd < 0)
DIE("open /tmp: %s\n", strerror(errno));
ret = io_uring_queue_init(RSIZE, &ring, 0);
if (ret < 0)
DIE("failed to init io_uring: %s\n", strerror(-ret));
ret = test_open_write(&ring, dfd, "io_uring_openat_write_test1");
io_uring_queue_exit(&ring);
close(dfd);
unlink("/tmp/io_uring_openat_write_test1");
return ret;
}
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