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      1 /*
      2  * Copyright (c) 2015 Gleb Fotengauer-Malinovskiy <glebfm (at) altlinux.org>
      3  * Copyright (c) 2015-2016 Dmitry V. Levin <ldv (at) altlinux.org>
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote products
     15  *    derived from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include "tests.h"
     30 #include <asm/unistd.h>
     31 
     32 #ifdef __NR_readlinkat
     33 
     34 # include <stdio.h>
     35 # include <unistd.h>
     36 
     37 # define PREFIX "test.readlinkat"
     38 # define TARGET (PREFIX ".target")
     39 # define LINKPATH (PREFIX ".link")
     40 
     41 int
     42 main(void)
     43 {
     44 	const char * const fname = tail_memdup(LINKPATH, sizeof(LINKPATH));
     45 	const char * const hex_fname =
     46 		hexquote_strndup(fname, sizeof(LINKPATH) - 1);
     47 
     48 	const unsigned int size = sizeof(TARGET) - 1;
     49 	char * const buf = tail_alloc(size);
     50 
     51 	(void) unlink(fname);
     52 
     53 	long rc = syscall(__NR_readlinkat, -100, fname, buf, size);
     54 	printf("readlinkat(AT_FDCWD, \"%s\", %p, %u) = -1 ENOENT (%m)\n",
     55 	       hex_fname, buf, size);
     56 
     57 	if (symlink(TARGET, fname))
     58 		perror_msg_and_fail("symlink");
     59 
     60 	rc = syscall(__NR_readlinkat, -100, fname, buf, size);
     61 	if (rc < 0) {
     62 		perror("readlinkat");
     63 		(void) unlink(fname);
     64 		return 77;
     65 	}
     66 	const char * const hex_buf = hexquote_strndup(buf, size);
     67 	printf("readlinkat(AT_FDCWD, \"%s\", \"%s\", %u) = %u\n",
     68 	       hex_fname, hex_buf, size, size);
     69 
     70 	if (unlink(fname))
     71 		perror_msg_and_fail("unlink");
     72 
     73 	puts("+++ exited with 0 +++");
     74 	return 0;
     75 }
     76 
     77 #else
     78 
     79 SKIP_MAIN_UNDEFINED("__NR_readlink")
     80 
     81 #endif
     82