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/* SPDX-License-Identifier: MIT */
/*
* Description: test io_uring symlinkat handling
*/
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "liburing.h"
static int do_symlinkat(struct io_uring *ring, const char *oldname, const char *newname)
{
int ret;
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
sqe = io_uring_get_sqe(ring);
if (!sqe) {
fprintf(stderr, "sqe get failed\n");
goto err;
}
io_uring_prep_symlinkat(sqe, oldname, AT_FDCWD, newname);
ret = io_uring_submit(ring);
if (ret != 1) {
fprintf(stderr, "submit failed: %d\n", ret);
goto err;
}
ret = io_uring_wait_cqes(ring, &cqe, 1, 0, 0);
if (ret) {
fprintf(stderr, "wait_cqe failed: %d\n", ret);
goto err;
}
ret = cqe->res;
io_uring_cqe_seen(ring, cqe);
return ret;
err:
return 1;
}
int test_link_contents(const char* linkname, const char *expected_contents)
{
char buf[128];
int ret = readlink(linkname, buf, 127);
if (ret < 0) {
perror("readlink");
return ret;
}
buf[ret] = 0;
if (strncmp(buf, expected_contents, 128)) {
fprintf(stderr, "link contents differs from expected: '%s' vs '%s'",
buf, expected_contents);
return -1;
}
return 0;
}
int main(int argc, char *argv[])
{
static const char target[] = "io_uring-symlinkat-test-target";
static const char linkname[] = "io_uring-symlinkat-test-link";
int ret;
struct io_uring ring;
if (argc > 1)
return 0;
ret = io_uring_queue_init(8, &ring, 0);
if (ret) {
fprintf(stderr, "queue init failed: %d\n", ret);
return ret;
}
ret = do_symlinkat(&ring, target, linkname);
if (ret < 0) {
if (ret == -EBADF || ret == -EINVAL) {
fprintf(stdout, "symlinkat not supported, skipping\n");
goto out;
}
fprintf(stderr, "symlinkat: %s\n", strerror(-ret));
goto err;
} else if (ret) {
goto err;
}
ret = test_link_contents(linkname, target);
if (ret < 0)
goto err1;
ret = do_symlinkat(&ring, target, linkname);
if (ret != -EEXIST) {
fprintf(stderr, "test_symlinkat linkname already exists failed: %d\n", ret);
goto err1;
}
ret = do_symlinkat(&ring, target, "surely/this/does/not/exist");
if (ret != -ENOENT) {
fprintf(stderr, "test_symlinkat no parent failed: %d\n", ret);
goto err1;
}
out:
unlinkat(AT_FDCWD, linkname, 0);
io_uring_queue_exit(&ring);
return 0;
err1:
unlinkat(AT_FDCWD, linkname, 0);
err:
io_uring_queue_exit(&ring);
return 1;
}
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