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/*
* Copyright (c) 2015 Gleb Fotengauer-Malinovskiy <glebfm@altlinux.org>
* Copyright (c) 2015-2018 Dmitry V. Levin <ldv@altlinux.org>
* Copyright (c) 2015-2019 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#ifdef __NR_readlinkat
# include <stdio.h>
# include <unistd.h>
# define PREFIX "test.readlinkat"
# define TARGET (PREFIX ".target")
# define LINKPATH (PREFIX ".link")
int
main(void)
{
const char * const fname = tail_memdup(LINKPATH, sizeof(LINKPATH));
const char * const hex_fname =
hexquote_strndup(fname, sizeof(LINKPATH) - 1);
const unsigned int size = sizeof(TARGET) - 1;
char * const buf = tail_alloc(size);
(void) unlink(fname);
long rc = syscall(__NR_readlinkat, -100, fname, buf, size);
printf("readlinkat(AT_FDCWD, \"%s\", %p, %u) = -1 ENOENT (%m)\n",
hex_fname, buf, size);
if (symlink(TARGET, fname))
perror_msg_and_fail("symlink");
rc = syscall(__NR_readlinkat, -100, fname, buf, size);
if (rc < 0) {
perror("readlinkat");
(void) unlink(fname);
return 77;
}
const char * const hex_buf = hexquote_strndup(buf, size);
printf("readlinkat(AT_FDCWD, \"%s\", \"%s\", %u) = %u\n",
hex_fname, hex_buf, size, size);
if (unlink(fname))
perror_msg_and_fail("unlink");
puts("+++ exited with 0 +++");
return 0;
}
#else
SKIP_MAIN_UNDEFINED("__NR_readlink")
#endif
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