/* File tree walker functions.
- Copyright (C) 1996-2001, 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 1996-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
-#include <dirent.h>
+#if __GNUC__
+# define alloca __builtin_alloca
+#else
+# if HAVE_ALLOCA_H
+# include <alloca.h>
+# else
+# ifdef _AIX
+ # pragma alloca
+# else
+char *alloca ();
+# endif
+# endif
+#endif
+
+#ifdef _LIBC
+# include <dirent.h>
+# define NAMLEN(dirent) _D_EXACT_NAMLEN (dirent)
+#else
+# if HAVE_DIRENT_H
+# include <dirent.h>
+# define NAMLEN(dirent) strlen ((dirent)->d_name)
+# else
+# define dirent direct
+# define NAMLEN(dirent) (dirent)->d_namlen
+# if HAVE_SYS_NDIR_H
+# include <sys/ndir.h>
+# endif
+# if HAVE_SYS_DIR_H
+# include <sys/dir.h>
+# endif
+# if HAVE_NDIR_H
+# include <ndir.h>
+# endif
+# endif
+#endif
+
#include <errno.h>
+#include <fcntl.h>
#include <ftw.h>
+#include <limits.h>
#include <search.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
-#if HAVE_SYS_PARAM_H || defined _LIBC
-# include <sys/param.h>
-#endif
+#include <not-cancel.h>
+#include <sys/param.h>
#ifdef _LIBC
# include <include/sys/stat.h>
#else
# include <sys/stat.h>
#endif
+#if ! _LIBC && !HAVE_DECL_STPCPY && !defined stpcpy
+char *stpcpy ();
+#endif
+
+#if ! _LIBC && ! defined HAVE_MEMPCPY && ! defined mempcpy
+/* Be CAREFUL that there are no side effects in N. */
+# define mempcpy(D, S, N) ((void *) ((char *) memcpy (D, S, N) + (N)))
+#endif
+
/* #define NDEBUG 1 */
#include <assert.h>
# undef __fchdir
# define __fchdir fchdir
# undef __getcwd
-# define __getcwd getcwd
+# define __getcwd(P, N) xgetcwd ()
+extern char *xgetcwd (void);
+# undef __mempcpy
+# define __mempcpy mempcpy
# undef __opendir
# define __opendir opendir
# undef __readdir64
# define __readdir64 readdir
+# undef __stpcpy
+# define __stpcpy stpcpy
# undef __tdestroy
# define __tdestroy tdestroy
# undef __tfind
# define __tfind tfind
# undef __tsearch
# define __tsearch tsearch
-# undef internal_function
-# define internal_function /* empty */
# undef dirent64
# define dirent64 dirent
# undef MAX
# define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
+/* Arrange to make lstat calls go through the wrapper function
+ on systems with an lstat function that does not dereference symlinks
+ that are specified with a trailing slash. */
+#if ! _LIBC && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
+int rpl_lstat (const char *, struct stat *);
+# undef lstat
+# define lstat(Name, Stat_buf) rpl_lstat(Name, Stat_buf)
+#endif
+
#ifndef __set_errno
# define __set_errno(Val) errno = (Val)
#endif
#ifndef FTW_NAME
# define FTW_NAME ftw
# define NFTW_NAME nftw
+# define NFTW_OLD_NAME __old_nftw
+# define NFTW_NEW_NAME __new_nftw
# define INO_T ino_t
# define STAT stat
-# define LXSTAT __lxstat
-# define XSTAT __xstat
+# ifdef _LIBC
+# define LXSTAT __lxstat
+# define XSTAT __xstat
+# define FXSTATAT __fxstatat
+# else
+# define LXSTAT(V,f,sb) lstat (f,sb)
+# define XSTAT(V,f,sb) stat (f,sb)
+# define FXSTATAT(V,d,f,sb,m) fstatat (d, f, sb, m)
+# endif
# define FTW_FUNC_T __ftw_func_t
# define NFTW_FUNC_T __nftw_func_t
#endif
+/* We define PATH_MAX if the system does not provide a definition.
+ This does not artificially limit any operation. PATH_MAX is simply
+ used as a guesstimate for the expected maximal path length.
+ Buffers will be enlarged if necessary. */
+#ifndef PATH_MAX
+# define PATH_MAX 1024
+#endif
+
struct dir_data
{
DIR *stream;
+ int streamfd;
char *content;
};
int flags;
/* Conversion array for flag values. It is the identity mapping for
- `nftw' calls, otherwise it maps the values to those know by
+ `nftw' calls, otherwise it maps the values to those known by
`ftw'. */
const int *cvt_arr;
};
-/* Internally we use the FTW_* constants used for `nftw'. When the
- process called `ftw' we must reduce the flag to the known flags
- for `ftw'. */
+/* Internally we use the FTW_* constants used for `nftw'. When invoked
+ as `ftw', map each flag to the subset of values used by `ftw'. */
static const int nftw_arr[] =
{
FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_SL, FTW_DP, FTW_SLN
/* Forward declarations of local functions. */
-static int ftw_dir (struct ftw_data *data, struct STAT *st) internal_function;
+static int ftw_dir (struct ftw_data *data, struct STAT *st,
+ struct dir_data *old_dir);
static int
accidentally compare `holes' in the structure. */
const struct known_object *kp1 = p1, *kp2 = p2;
int cmp1;
- cmp1 = (kp1->dev > kp2->dev) - (kp1->dev < kp2->dev);
+ cmp1 = (kp1->ino > kp2->ino) - (kp1->ino < kp2->ino);
if (cmp1 != 0)
return cmp1;
- return (kp1->ino > kp2->ino) - (kp1->ino < kp2->ino);
+ return (kp1->dev > kp2->dev) - (kp1->dev < kp2->dev);
}
-static inline int
+static int
add_object (struct ftw_data *data, struct STAT *st)
{
struct known_object *newp = malloc (sizeof (struct known_object));
static inline int
find_object (struct ftw_data *data, struct STAT *st)
{
- struct known_object obj = { .dev = st->st_dev, .ino = st->st_ino };
+ struct known_object obj;
+ obj.dev = st->st_dev;
+ obj.ino = st->st_ino;
return __tfind (&obj, &data->known_objects, object_compare) != NULL;
}
static inline int
-open_dir_stream (struct ftw_data *data, struct dir_data *dirp)
+__attribute ((always_inline))
+open_dir_stream (int *dfdp, struct ftw_data *data, struct dir_data *dirp)
{
int result = 0;
while ((d = __readdir64 (st)) != NULL)
{
- size_t this_len = _D_EXACT_NAMLEN (d);
+ size_t this_len = NAMLEN (d);
if (actsize + this_len + 2 >= bufsize)
{
char *newp;
int save_err = errno;
free (buf);
__set_errno (save_err);
- result = -1;
- break;
+ return -1;
}
buf = newp;
}
{
__closedir (st);
data->dirstreams[data->actdir]->stream = NULL;
+ data->dirstreams[data->actdir]->streamfd = -1;
data->dirstreams[data->actdir] = NULL;
}
}
/* Open the new stream. */
if (result == 0)
{
- const char *name = ((data->flags & FTW_CHDIR)
- ? data->dirbuf + data->ftw.base: data->dirbuf);
assert (data->dirstreams[data->actdir] == NULL);
- dirp->stream = __opendir (name);
+ if (dfdp != NULL && *dfdp != -1)
+ {
+ int fd = __openat64_nocancel (*dfdp, data->dirbuf + data->ftw.base,
+ O_RDONLY | O_DIRECTORY | O_NDELAY);
+ dirp->stream = NULL;
+ if (fd != -1 && (dirp->stream = __fdopendir (fd)) == NULL)
+ __close_nocancel_nostatus (fd);
+ }
+ else
+ {
+ const char *name;
+
+ if (data->flags & FTW_CHDIR)
+ {
+ name = data->dirbuf + data->ftw.base;
+ if (name[0] == '\0')
+ name = ".";
+ }
+ else
+ name = data->dirbuf;
+
+ dirp->stream = __opendir (name);
+ }
+
if (dirp->stream == NULL)
result = -1;
else
{
+ dirp->streamfd = __dirfd (dirp->stream);
dirp->content = NULL;
data->dirstreams[data->actdir] = dirp;
}
-static inline int
+static int
process_entry (struct ftw_data *data, struct dir_data *dir, const char *name,
- size_t namlen)
+ size_t namlen, int d_type)
{
struct STAT st;
int result = 0;
int flag = 0;
+ size_t new_buflen;
if (name[0] == '.' && (name[1] == '\0'
|| (name[1] == '.' && name[2] == '\0')))
/* Don't process the "." and ".." entries. */
return 0;
- if (data->dirbufsize < data->ftw.base + namlen + 2)
+ new_buflen = data->ftw.base + namlen + 2;
+ if (data->dirbufsize < new_buflen)
{
/* Enlarge the buffer. */
char *newp;
- data->dirbufsize *= 2;
+ data->dirbufsize = 2 * new_buflen;
newp = (char *) realloc (data->dirbuf, data->dirbufsize);
if (newp == NULL)
return -1;
*((char *) __mempcpy (data->dirbuf + data->ftw.base, name, namlen)) = '\0';
- if ((data->flags & FTW_CHDIR) == 0)
- name = data->dirbuf;
+ int statres;
+ if (dir->streamfd != -1)
+ statres = FXSTATAT (_STAT_VER, dir->streamfd, name, &st,
+ (data->flags & FTW_PHYS) ? AT_SYMLINK_NOFOLLOW : 0);
+ else
+ {
+ if ((data->flags & FTW_CHDIR) == 0)
+ name = data->dirbuf;
+
+ statres = ((data->flags & FTW_PHYS)
+ ? LXSTAT (_STAT_VER, name, &st)
+ : XSTAT (_STAT_VER, name, &st));
+ }
- if (((data->flags & FTW_PHYS)
- ? LXSTAT (_STAT_VER, name, &st)
- : XSTAT (_STAT_VER, name, &st)) < 0)
+ if (statres < 0)
{
if (errno != EACCES && errno != ENOENT)
result = -1;
- else if (!(data->flags & FTW_PHYS)
- && LXSTAT (_STAT_VER, name, &st) == 0
- && S_ISLNK (st.st_mode))
+ else if (data->flags & FTW_PHYS)
+ flag = FTW_NS;
+ else if (d_type == DT_LNK)
flag = FTW_SLN;
else
- flag = FTW_NS;
+ {
+ if (dir->streamfd != -1)
+ statres = FXSTATAT (_STAT_VER, dir->streamfd, name, &st,
+ AT_SYMLINK_NOFOLLOW);
+ else
+ statres = LXSTAT (_STAT_VER, name, &st);
+ if (statres == 0 && S_ISLNK (st.st_mode))
+ flag = FTW_SLN;
+ else
+ flag = FTW_NS;
+ }
}
else
{
|| (!find_object (data, &st)
/* Remember the object. */
&& (result = add_object (data, &st)) == 0))
- {
- result = ftw_dir (data, &st);
-
- if (result == 0 && (data->flags & FTW_CHDIR))
- {
- /* Change back to current directory. */
- int done = 0;
- if (dir->stream != NULL)
- if (__fchdir (dirfd (dir->stream)) == 0)
- done = 1;
-
- if (!done)
- {
- if (data->ftw.base == 1)
- {
- if (__chdir ("/") < 0)
- result = -1;
- }
- else
- if (__chdir ("..") < 0)
- result = -1;
- }
- }
- }
+ result = ftw_dir (data, &st, dir);
}
else
result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag],
&data->ftw);
}
+ if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SUBTREE)
+ result = 0;
+
return result;
}
static int
-internal_function
-ftw_dir (struct ftw_data *data, struct STAT *st)
+__attribute ((noinline))
+ftw_dir (struct ftw_data *data, struct STAT *st, struct dir_data *old_dir)
{
struct dir_data dir;
struct dirent64 *d;
/* Open the stream for this directory. This might require that
another stream has to be closed. */
- result = open_dir_stream (data, &dir);
+ result = open_dir_stream (old_dir == NULL ? NULL : &old_dir->streamfd,
+ data, &dir);
if (result != 0)
{
if (errno == EACCES)
if (!(data->flags & FTW_DEPTH))
{
result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw);
- if (result != 0)
- return result;
- }
-
- /* If necessary, change to this directory. */
- if (data->flags & FTW_CHDIR)
- {
- if (__fchdir (dirfd (dir.stream)) < 0)
- {
- if (errno == ENOSYS)
- {
- if (__chdir (data->dirbuf) < 0)
- result = -1;
- }
- else
- result = -1;
- }
-
if (result != 0)
{
- int save_err = errno;
+ int save_err;
+fail:
+ save_err = errno;
__closedir (dir.stream);
+ dir.streamfd = -1;
__set_errno (save_err);
if (data->actdir-- == 0)
data->actdir = data->maxdir - 1;
data->dirstreams[data->actdir] = NULL;
-
return result;
}
}
+ /* If necessary, change to this directory. */
+ if (data->flags & FTW_CHDIR)
+ {
+ if (__fchdir (__dirfd (dir.stream)) < 0)
+ {
+ result = -1;
+ goto fail;
+ }
+ }
+
/* Next, update the `struct FTW' information. */
++data->ftw.level;
- startp = strchr (data->dirbuf, '\0');
+ startp = __rawmemchr (data->dirbuf, '\0');
/* There always must be a directory name. */
assert (startp != data->dirbuf);
if (startp[-1] != '/')
while (dir.stream != NULL && (d = __readdir64 (dir.stream)) != NULL)
{
- result = process_entry (data, &dir, d->d_name, _D_EXACT_NAMLEN (d));
+ int d_type = DT_UNKNOWN;
+#ifdef _DIRENT_HAVE_D_TYPE
+ d_type = d->d_type;
+#endif
+ result = process_entry (data, &dir, d->d_name, NAMLEN (d), d_type);
if (result != 0)
break;
}
assert (dir.content == NULL);
__closedir (dir.stream);
+ dir.streamfd = -1;
__set_errno (save_err);
if (data->actdir-- == 0)
{
char *endp = strchr (runp, '\0');
- result = process_entry (data, &dir, runp, endp - runp);
+ // XXX Should store the d_type values as well?!
+ result = process_entry (data, &dir, runp, endp - runp, DT_UNKNOWN);
runp = endp + 1;
}
__set_errno (save_err);
}
+ if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SIBLINGS)
+ result = 0;
+
/* Prepare the return, revert the `struct FTW' information. */
data->dirbuf[data->ftw.base - 1] = '\0';
--data->ftw.level;
if (result == 0 && (data->flags & FTW_DEPTH))
result = (*data->func) (data->dirbuf, st, FTW_DP, &data->ftw);
+ if (old_dir
+ && (data->flags & FTW_CHDIR)
+ && (result == 0
+ || ((data->flags & FTW_ACTIONRETVAL)
+ && (result != -1 && result != FTW_STOP))))
+ {
+ /* Change back to the parent directory. */
+ int done = 0;
+ if (old_dir->stream != NULL)
+ if (__fchdir (__dirfd (old_dir->stream)) == 0)
+ done = 1;
+
+ if (!done)
+ {
+ if (data->ftw.base == 1)
+ {
+ if (__chdir ("/") < 0)
+ result = -1;
+ }
+ else
+ if (__chdir ("..") < 0)
+ result = -1;
+ }
+ }
+
return result;
}
static int
-internal_function
+__attribute ((noinline))
ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
int flags)
{
struct STAT st;
int result = 0;
int save_err;
+ int cwdfd = -1;
char *cwd = NULL;
char *cp;
* sizeof (struct dir_data *));
memset (data.dirstreams, '\0', data.maxdir * sizeof (struct dir_data *));
-#ifdef PATH_MAX
+ /* PATH_MAX is always defined when we get here. */
data.dirbufsize = MAX (2 * strlen (dir), PATH_MAX);
-#else
- data.dirbufsize = 2 * strlen (dir);
-#endif
data.dirbuf = (char *) malloc (data.dirbufsize);
if (data.dirbuf == NULL)
return -1;
data.known_objects = NULL;
/* Now go to the directory containing the initial file/directory. */
- if ((flags & FTW_CHDIR) && data.ftw.base > 0)
+ if (flags & FTW_CHDIR)
{
- /* GNU extension ahead. */
- cwd = __getcwd (NULL, 0);
- if (cwd == NULL)
- result = -1;
- else
+ /* We have to be able to go back to the current working
+ directory. The best way to do this is to use a file
+ descriptor. */
+ cwdfd = __open (".", O_RDONLY | O_DIRECTORY);
+ if (cwdfd == -1)
+ {
+ /* Try getting the directory name. This can be needed if
+ the current directory is executable but not readable. */
+ if (errno == EACCES)
+ /* GNU extension ahead. */
+ cwd = __getcwd (NULL, 0);
+
+ if (cwd == NULL)
+ goto out_fail;
+ }
+ else if (data.maxdir > 1)
+ /* Account for the file descriptor we use here. */
+ --data.maxdir;
+
+ if (data.ftw.base > 0)
{
/* Change to the directory the file is in. In data.dirbuf
we have a writable copy of the file name. Just NUL
/* Get stat info for start directory. */
if (result == 0)
{
- const char *name = ((data.flags & FTW_CHDIR)
- ? data.dirbuf + data.ftw.base
- : data.dirbuf);
+ const char *name;
+
+ if (data.flags & FTW_CHDIR)
+ {
+ name = data.dirbuf + data.ftw.base;
+ if (name[0] == '\0')
+ name = ".";
+ }
+ else
+ name = data.dirbuf;
if (((flags & FTW_PHYS)
? LXSTAT (_STAT_VER, name, &st)
result = add_object (&data, &st);
if (result == 0)
- result = ftw_dir (&data, &st);
+ result = ftw_dir (&data, &st, NULL);
}
else
{
&data.ftw);
}
}
+
+ if ((flags & FTW_ACTIONRETVAL)
+ && (result == FTW_SKIP_SUBTREE || result == FTW_SKIP_SIBLINGS))
+ result = 0;
}
/* Return to the start directory (if necessary). */
- if (cwd != NULL)
+ if (cwdfd != -1)
+ {
+ int save_err = errno;
+ __fchdir (cwdfd);
+ __close_nocancel_nostatus (cwdfd);
+ __set_errno (save_err);
+ }
+ else if (cwd != NULL)
{
int save_err = errno;
__chdir (cwd);
}
/* Free all memory. */
+ out_fail:
save_err = errno;
__tdestroy (data.known_objects, free);
free (data.dirbuf);
/* Entry points. */
int
-FTW_NAME (path, func, descriptors)
- const char *path;
- FTW_FUNC_T func;
- int descriptors;
+FTW_NAME (const char *path, FTW_FUNC_T func, int descriptors)
{
return ftw_startup (path, 0, func, descriptors, 0);
}
+#ifndef _LIBC
int
-NFTW_NAME (path, func, descriptors, flags)
- const char *path;
- NFTW_FUNC_T func;
- int descriptors;
- int flags;
+NFTW_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
{
return ftw_startup (path, 1, func, descriptors, flags);
}
+#else
+
+# include <shlib-compat.h>
+
+int NFTW_NEW_NAME (const char *, NFTW_FUNC_T, int, int);
+
+int
+NFTW_NEW_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
+{
+ if (flags
+ & ~(FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH | FTW_ACTIONRETVAL))
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+ return ftw_startup (path, 1, func, descriptors, flags);
+}
+
+versioned_symbol (libc, NFTW_NEW_NAME, NFTW_NAME, GLIBC_2_3_3);
+
+# if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_3_3)
+
+/* Older nftw* version just ignored all unknown flags. */
+
+int NFTW_OLD_NAME (const char *, NFTW_FUNC_T, int, int);
+
+int
+attribute_compat_text_section
+NFTW_OLD_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
+{
+ flags &= (FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH);
+ return ftw_startup (path, 1, func, descriptors, flags);
+}
+
+compat_symbol (libc, NFTW_OLD_NAME, NFTW_NAME, GLIBC_2_1);
+# endif
+#endif
projects / thirdparty / glibc.git / blobdiff