diff options
Diffstat (limited to 'lib/fstatat.c')
| -rw-r--r-- | lib/fstatat.c | 132 |
1 files changed, 105 insertions, 27 deletions
diff --git a/lib/fstatat.c b/lib/fstatat.c index 92a5164..ebbecfd 100644 --- a/lib/fstatat.c +++ b/lib/fstatat.c @@ -1,11 +1,11 @@ /* Work around an fstatat bug on Solaris 9. - Copyright (C) 2006 Free Software Foundation, Inc. + Copyright (C) 2006, 2009-2016 Free Software Foundation, Inc. - This program is free software; you can redistribute it and/or modify + This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of @@ -13,45 +13,123 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software Foundation, - Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* Written by Paul Eggert and Jim Meyering. */ +/* If the user's config.h happens to include <sys/stat.h>, let it include only + the system's <sys/stat.h> here, so that orig_fstatat doesn't recurse to + rpl_fstatat. */ +#define __need_system_sys_stat_h #include <config.h> -#define COMPILING_FSTATAT 1 -#include "openat.h" +/* Get the original definition of fstatat. It might be defined as a macro. */ +#include <sys/types.h> +#include <sys/stat.h> +#undef __need_system_sys_stat_h + +#if HAVE_FSTATAT +static int +orig_fstatat (int fd, char const *filename, struct stat *buf, int flags) +{ + return fstatat (fd, filename, buf, flags); +} +#endif + +/* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc + eliminates this include because of the preliminary #include <sys/stat.h> + above. */ +#include "sys/stat.h" #include <errno.h> +#include <fcntl.h> #include <string.h> +#if HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG + +# ifndef LSTAT_FOLLOWS_SLASHED_SYMLINK +# define LSTAT_FOLLOWS_SLASHED_SYMLINK 0 +# endif + /* fstatat should always follow symbolic links that end in /, but on - Solaris 9 it doesn't if AT_SYMLINK_NOFOLLOW is specified. This is - the same problem that lstat.c addresses, so solve it in a similar - way. */ + Solaris 9 it doesn't if AT_SYMLINK_NOFOLLOW is specified. + Likewise, trailing slash on a non-directory should be an error. + These are the same problems that lstat.c and stat.c address, so + solve it in a similar way. + + AIX 7.1 fstatat (AT_FDCWD, ..., 0) always fails, which is a bug. + Work around this bug if FSTATAT_AT_FDCWD_0_BROKEN is nonzero. */ int rpl_fstatat (int fd, char const *file, struct stat *st, int flag) { - int result = fstatat (fd, file, st, flag); + int result = orig_fstatat (fd, file, st, flag); + size_t len; - if (result == 0 && (flag & AT_SYMLINK_NOFOLLOW) && S_ISLNK (st->st_mode) - && file[strlen (file) - 1] == '/') + if (LSTAT_FOLLOWS_SLASHED_SYMLINK || result != 0) + return result; + len = strlen (file); + if (flag & AT_SYMLINK_NOFOLLOW) { - /* FILE refers to a symbolic link and the name ends with a slash. - Get info about the link's referent. */ - result = fstatat (fd, file, st, flag & ~AT_SYMLINK_NOFOLLOW); - if (result == 0 && ! S_ISDIR (st->st_mode)) - { - /* fstatat succeeded and FILE references a non-directory. - But it was specified via a name including a trailing - slash. Fail with errno set to ENOTDIR to indicate the - contradiction. */ - errno = ENOTDIR; - return -1; - } + /* Fix lstat behavior. */ + if (file[len - 1] != '/' || S_ISDIR (st->st_mode)) + return 0; + if (!S_ISLNK (st->st_mode)) + { + errno = ENOTDIR; + return -1; + } + result = orig_fstatat (fd, file, st, flag & ~AT_SYMLINK_NOFOLLOW); + } + /* Fix stat behavior. */ + if (result == 0 && !S_ISDIR (st->st_mode) && file[len - 1] == '/') + { + errno = ENOTDIR; + return -1; } - return result; } + +#else /* ! (HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG) */ + +/* On mingw, the gnulib <sys/stat.h> defines 'stat' as a function-like + macro; but using it in AT_FUNC_F2 causes compilation failure + because the preprocessor sees a use of a macro that requires two + arguments but is only given one. Hence, we need an inline + forwarder to get past the preprocessor. */ +static int +stat_func (char const *name, struct stat *st) +{ + return stat (name, st); +} + +/* Likewise, if there is no native 'lstat', then the gnulib + <sys/stat.h> defined it as stat, which also needs adjustment. */ +# if !HAVE_LSTAT +# undef lstat +# define lstat stat_func +# endif + +/* Replacement for Solaris' function by the same name. + <http://www.google.com/search?q=fstatat+site:docs.sun.com> + First, try to simulate it via l?stat ("/proc/self/fd/FD/FILE"). + Failing that, simulate it via save_cwd/fchdir/(stat|lstat)/restore_cwd. + If either the save_cwd or the restore_cwd fails (relatively unlikely), + then give a diagnostic and exit nonzero. + Otherwise, this function works just like Solaris' fstatat. */ + +# define AT_FUNC_NAME fstatat +# define AT_FUNC_F1 lstat +# define AT_FUNC_F2 stat_func +# define AT_FUNC_USE_F1_COND AT_SYMLINK_NOFOLLOW +# define AT_FUNC_POST_FILE_PARAM_DECLS , struct stat *st, int flag +# define AT_FUNC_POST_FILE_ARGS , st +# include "at-func.c" +# undef AT_FUNC_NAME +# undef AT_FUNC_F1 +# undef AT_FUNC_F2 +# undef AT_FUNC_USE_F1_COND +# undef AT_FUNC_POST_FILE_PARAM_DECLS +# undef AT_FUNC_POST_FILE_ARGS + +#endif /* !HAVE_FSTATAT */ |