1/* Work around a bug of lstat on some systems 2 3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free 4 Software Foundation, Inc. 5 6 This program is free software: you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 18 19/* written by Jim Meyering */ 20 21#include <config.h> 22 23/* The specification of these functions is in sys_stat.h. But we cannot 24 include this include file here, because on some systems, a 25 "#define lstat lstat64" is being used, and sys_stat.h deletes this 26 definition. */ 27 28#include <sys/types.h> 29#include <sys/stat.h> 30#include <string.h> 31#include <errno.h> 32 33/* lstat works differently on Linux and Solaris systems. POSIX (see 34 `pathname resolution' in the glossary) requires that programs like 35 `ls' take into consideration the fact that FILE has a trailing slash 36 when FILE is a symbolic link. On Linux and Solaris 10 systems, the 37 lstat function already has the desired semantics (in treating 38 `lstat ("symlink/", sbuf)' just like `lstat ("symlink/.", sbuf)', 39 but on Solaris 9 and earlier it does not. 40 41 If FILE has a trailing slash and specifies a symbolic link, 42 then use stat() to get more info on the referent of FILE. 43 If the referent is a non-directory, then set errno to ENOTDIR 44 and return -1. Otherwise, return stat's result. */ 45 46int 47rpl_lstat (const char *file, struct stat *sbuf) 48{ 49 size_t len; 50 int lstat_result = lstat (file, sbuf); 51 52 if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode)) 53 return lstat_result; 54 55 len = strlen (file); 56 if (len == 0 || file[len - 1] != '/') 57 return 0; 58 59 /* FILE refers to a symbolic link and the name ends with a slash. 60 Call stat() to get info about the link's referent. */ 61 62 /* If stat fails, then we do the same. */ 63 if (stat (file, sbuf) != 0) 64 return -1; 65 66 /* If FILE references a directory, return 0. */ 67 if (S_ISDIR (sbuf->st_mode)) 68 return 0; 69 70 /* Here, we know stat succeeded and FILE references a non-directory. 71 But it was specified via a name including a trailing slash. 72 Fail with errno set to ENOTDIR to indicate the contradiction. */ 73 errno = ENOTDIR; 74 return -1; 75} 76