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/* SPDX-License-Identifier: MIT */
/*
* Description: open+read+close link sequence with fd passing
*
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include "liburing.h"
#ifndef O_SPECIFIC_FD
#define O_SPECIFIC_FD 01000000000
#endif
#define USE_FD 89
static int test_orc(struct io_uring *ring, const char *fname)
{
struct io_uring_cqe *cqe;
struct io_uring_sqe *sqe;
struct open_how how;
char buf[32];
int ret, i;
int nr = 0;
how.flags = O_RDONLY | O_SPECIFIC_FD;
how.mode = 0;
how.resolve = 0;
how.fd = USE_FD;
sqe = io_uring_get_sqe(ring);
io_uring_prep_openat2(sqe, AT_FDCWD, fname, &how);
sqe->flags |= IOSQE_IO_LINK;
sqe->user_data = IORING_OP_OPENAT2;
nr++;
sqe = io_uring_get_sqe(ring);
io_uring_prep_read(sqe, USE_FD, buf, sizeof(buf), 0);
sqe->flags |= IOSQE_IO_LINK;
sqe->user_data = IORING_OP_READ;
nr++;
sqe = io_uring_get_sqe(ring);
io_uring_prep_close(sqe, USE_FD);
sqe->user_data = IORING_OP_CLOSE;
nr++;
ret = io_uring_submit(ring);
if (ret != nr) {
fprintf(stderr, "sqe submit failed: %d\n", ret);
goto err;
}
for (i = 0; i < nr; i++) {
ret = io_uring_wait_cqe(ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait completion %d\n", ret);
goto err;
}
printf("%d: op=%u, res=%d\n", i, (unsigned) cqe->user_data, cqe->res);
if (cqe->user_data == IORING_OP_OPENAT2 && cqe->res != USE_FD)
printf("openat2 got fd %d, wanted %d\n", cqe->res, USE_FD);
io_uring_cqe_seen(ring, cqe);
}
return 0;
err:
return 1;
}
int main(int argc, char *argv[])
{
struct io_uring ring;
int ret;
if (argc < 2) {
fprintf(stderr, "%s: <file>\n", argv[0]);
return 1;
}
ret = io_uring_queue_init(8, &ring, 0);
if (ret) {
fprintf(stderr, "ring setup failed: %d\n", ret);
return 1;
}
ret = test_orc(&ring, argv[1]);
if (ret) {
fprintf(stderr, "test_orc failed\n");
return ret;
}
return 0;
}
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