1 /* xreadlinkat.c -- readlink wrapper to return the link name in malloc'd storage 2 3 Copyright (C) 2001, 2003-2007, 2009-2021 Free Software Foundation, Inc. 4 5 This program is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 17 18 /* Written by Jim Meyering <jim@meyering.net>, 19 and Bruno Haible <bruno@clisp.org>, 20 and Eric Blake <ebb9@byu.net>. */ 21 22 #include <config.h> 23 24 /* Specification. */ 25 #include "xreadlink.h" 26 27 #include <errno.h> 28 29 #include "areadlink.h" 30 #include "xalloc.h" 31 32 /* Call readlinkat to get the symbolic link value of FILENAME relative to FD. 33 Return a pointer to that NUL-terminated string in malloc'd storage. 34 If readlinkat fails, return NULL and set errno (although failure to 35 change directory will issue a diagnostic and exit). 36 If realloc fails, or if the link value is longer than SIZE_MAX :-), 37 give a diagnostic and exit. */ 38 39 char * 40 xreadlinkat (int fd, char const *filename) /* */ 41 { 42 char *result = areadlinkat (fd, filename); 43 if (result == NULL && errno == ENOMEM) 44 xalloc_die (); 45 return result; 46 }