1 /* 2 * Copyright (c) 2015 Gleb Fotengauer-Malinovskiy <glebfm (at) altlinux.org> 3 * Copyright (c) 2015 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 #ifdef HAVE_CONFIG_H 30 # include "config.h" 31 #endif 32 33 #include <stdio.h> 34 #include <unistd.h> 35 #include <sys/syscall.h> 36 37 int 38 main(void) 39 { 40 #ifdef __NR_readlink 41 static const char fname[] = "readlink.link"; 42 unsigned char buf[31]; 43 long rc; 44 unsigned int i; 45 46 rc = syscall(__NR_readlink, fname, buf, sizeof(buf)); 47 if (rc < 0) 48 return 77; 49 50 printf("readlink(\""); 51 for (i = 0; fname[i]; ++i) 52 printf("\\x%02x", (int) (unsigned char) fname[i]); 53 printf("\", \""); 54 for (i = 0; i < 3; ++i) 55 printf("\\x%02x", (int) buf[i]); 56 printf("\"..., %zu) = %ld\n", sizeof(buf), rc); 57 58 puts("+++ exited with 0 +++"); 59 return 0; 60 #else 61 return 77; 62 #endif 63 } 64
