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emacs/lib/dirent.in.h
Paul Eggert 8654f9d7d6 Use fdopendir, fstatat and readlinkat, for efficiency. 
On my host, this speeds up directory-files-and-attributes by a
factor of 3, when applied to Emacs's src directory.
These functions are standardized by POSIX and are common these
days; fall back on a (slower) gnulib implementation if the host
is too old to supply them.
* .bzrignore: Add lib/dirent.h.
* lib/Makefile.am (libgnu_a_SOURCES): Add openat-die.c, save-cwd.c.
* lib/careadlinkat.c, lib/careadlinkat.h: Merge from gnulib,
incorporating: 2013-01-29 careadlinkat: do not provide careadlinkatcwd.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* lib/dirent.in.h, lib/fdopendir.c, lib/fstatat.c, lib/openat-priv.h:
* lib/openat-proc.c, lib/openat.h, m4/dirent_h.m4, m4/fdopendir.m4:
* m4/fstatat.m4: New files, from gnulib.
* lib/openat-die.c, lib/save-cwd.c, lib/save-cwd.h: New files.
These last three are specific to Emacs and are not copied from gnulib.
They are simpler than the gnulib versions and are tuned for Emacs.
* admin/merge-gnulib (GNULIB_MODULES): Add fdopendir, fstatat, readlinkat.
(GNULIB_TOOL_FLAGS): Do not avoid at-internal, openat-h.
Avoid dup, open, opendir.
* nt/inc/sys/stat.h (fstatat):
* nt/inc/unistd.h (readlinkat): New decls.
* src/conf_post.h (GNULIB_SUPPORT_ONLY_AT_FDCWD): Remove.
* src/dired.c: Include <fcntl.h>.
(open_directory): New function, which uses open and fdopendir
rather than opendir.  DOS_NT platforms still use opendir, though.
(directory_files_internal, file_name_completion): Use it.
(file_attributes): New function, with most of the old Ffile_attributes.
(directory_files_internal, Ffile_attributes): Use it.
(file_attributes, file_name_completion_stat): First arg is now fd,
not dir name.  All uses changed.  Use fstatat rather than lstat +
stat.
(file_attributes): Use emacs_readlinkat rather than Ffile_symlink_p.
* src/fileio.c: Include <allocator.h>, <careadlinkat.h>.
(emacs_readlinkat): New function, with much of the old
Ffile_symlink_p, but with an fd argument for speed.
It uses readlinkat rather than careadlinkatcwd, so that it
need not assume the working directory.
(Ffile_symlink_p): Use it.
* src/filelock.c (current_lock_owner): Use emacs_readlinkat
rather than emacs_readlink.
* src/lisp.h (emacs_readlinkat): New decl.
(READLINK_BUFSIZE, emacs_readlink): Remove.
* src/sysdep.c: Do not include <allocator.h>, <careadlinkat.h>.
(emacs_norealloc_allocator, emacs_readlink): Remove.
This stuff is moved to fileio.c.
* src/w32.c (fstatat, readlinkat): New functions.
(careadlinkat): Don't check that fd == AT_FDCWD.
(careadlinkatcwd): Remove; no longer needed.

Fixes: debbugs:13539
2013-01-31 22:30:51 -08:00

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/* A GNU-like <dirent.h>.
Copyright (C) 2006-2013 Free Software Foundation, Inc.
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 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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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, see <http://www.gnu.org/licenses/>. */
#ifndef _@GUARD_PREFIX@_DIRENT_H
#if __GNUC__ >= 3
@PRAGMA_SYSTEM_HEADER@
#endif
@PRAGMA_COLUMNS@
/* The include_next requires a split double-inclusion guard. */
#if @HAVE_DIRENT_H@
# @INCLUDE_NEXT@ @NEXT_DIRENT_H@
#endif
#ifndef _@GUARD_PREFIX@_DIRENT_H
#define _@GUARD_PREFIX@_DIRENT_H
/* Get ino_t. Needed on some systems, including glibc 2.8. */
#include <sys/types.h>
#if !@HAVE_DIRENT_H@
/* Define types DIR and 'struct dirent'. */
# if !GNULIB_defined_struct_dirent
struct dirent
{
char d_type;
char d_name[1];
};
/* Possible values for 'd_type'. */
# define DT_UNKNOWN 0
# define DT_FIFO 1 /* FIFO */
# define DT_CHR 2 /* character device */
# define DT_DIR 4 /* directory */
# define DT_BLK 6 /* block device */
# define DT_REG 8 /* regular file */
# define DT_LNK 10 /* symbolic link */
# define DT_SOCK 12 /* socket */
# define DT_WHT 14 /* whiteout */
typedef struct gl_directory DIR;
# define GNULIB_defined_struct_dirent 1
# endif
#endif
/* The __attribute__ feature is available in gcc versions 2.5 and later.
The attribute __pure__ was added in gcc 2.96. */
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
#else
# define _GL_ATTRIBUTE_PURE /* empty */
#endif
/* The definitions of _GL_FUNCDECL_RPL etc. are copied here. */
/* The definition of _GL_ARG_NONNULL is copied here. */
/* The definition of _GL_WARN_ON_USE is copied here. */
/* Declare overridden functions. */
#if @GNULIB_OPENDIR@
# if @REPLACE_OPENDIR@
# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
# undef opendir
# define opendir rpl_opendir
# endif
_GL_FUNCDECL_RPL (opendir, DIR *, (const char *dir_name) _GL_ARG_NONNULL ((1)));
_GL_CXXALIAS_RPL (opendir, DIR *, (const char *dir_name));
# else
# if !@HAVE_OPENDIR@
_GL_FUNCDECL_SYS (opendir, DIR *, (const char *dir_name) _GL_ARG_NONNULL ((1)));
# endif
_GL_CXXALIAS_SYS (opendir, DIR *, (const char *dir_name));
# endif
_GL_CXXALIASWARN (opendir);
#elif defined GNULIB_POSIXCHECK
# undef opendir
# if HAVE_RAW_DECL_OPENDIR
_GL_WARN_ON_USE (opendir, "opendir is not portable - "
"use gnulib module opendir for portability");
# endif
#endif
#if @GNULIB_READDIR@
# if !@HAVE_READDIR@
_GL_FUNCDECL_SYS (readdir, struct dirent *, (DIR *dirp) _GL_ARG_NONNULL ((1)));
# endif
_GL_CXXALIAS_SYS (readdir, struct dirent *, (DIR *dirp));
_GL_CXXALIASWARN (readdir);
#elif defined GNULIB_POSIXCHECK
# undef readdir
# if HAVE_RAW_DECL_READDIR
_GL_WARN_ON_USE (readdir, "readdir is not portable - "
"use gnulib module readdir for portability");
# endif
#endif
#if @GNULIB_REWINDDIR@
# if !@HAVE_REWINDDIR@
_GL_FUNCDECL_SYS (rewinddir, void, (DIR *dirp) _GL_ARG_NONNULL ((1)));
# endif
_GL_CXXALIAS_SYS (rewinddir, void, (DIR *dirp));
_GL_CXXALIASWARN (rewinddir);
#elif defined GNULIB_POSIXCHECK
# undef rewinddir
# if HAVE_RAW_DECL_REWINDDIR
_GL_WARN_ON_USE (rewinddir, "rewinddir is not portable - "
"use gnulib module rewinddir for portability");
# endif
#endif
#if @GNULIB_CLOSEDIR@
# if @REPLACE_CLOSEDIR@
# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
# undef closedir
# define closedir rpl_closedir
# endif
_GL_FUNCDECL_RPL (closedir, int, (DIR *dirp) _GL_ARG_NONNULL ((1)));
_GL_CXXALIAS_RPL (closedir, int, (DIR *dirp));
# else
# if !@HAVE_CLOSEDIR@
_GL_FUNCDECL_SYS (closedir, int, (DIR *dirp) _GL_ARG_NONNULL ((1)));
# endif
_GL_CXXALIAS_SYS (closedir, int, (DIR *dirp));
# endif
_GL_CXXALIASWARN (closedir);
#elif defined GNULIB_POSIXCHECK
# undef closedir
# if HAVE_RAW_DECL_CLOSEDIR
_GL_WARN_ON_USE (closedir, "closedir is not portable - "
"use gnulib module closedir for portability");
# endif
#endif
#if @GNULIB_DIRFD@
/* Return the file descriptor associated with the given directory stream,
or -1 if none exists. */
# if @REPLACE_DIRFD@
# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
# undef dirfd
# define dirfd rpl_dirfd
# endif
_GL_FUNCDECL_RPL (dirfd, int, (DIR *) _GL_ARG_NONNULL ((1)));
_GL_CXXALIAS_RPL (dirfd, int, (DIR *));
# else
# if defined __cplusplus && defined GNULIB_NAMESPACE && defined dirfd
/* dirfd is defined as a macro and not as a function.
Turn it into a function and get rid of the macro. */
static inline int (dirfd) (DIR *dp) { return dirfd (dp); }
# undef dirfd
# endif
# if !(@HAVE_DECL_DIRFD@ || defined dirfd)
_GL_FUNCDECL_SYS (dirfd, int, (DIR *) _GL_ARG_NONNULL ((1)));
# endif
_GL_CXXALIAS_SYS (dirfd, int, (DIR *));
# endif
_GL_CXXALIASWARN (dirfd);
#elif defined GNULIB_POSIXCHECK
# undef dirfd
# if HAVE_RAW_DECL_DIRFD
_GL_WARN_ON_USE (dirfd, "dirfd is unportable - "
"use gnulib module dirfd for portability");
# endif
#endif
#if @GNULIB_FDOPENDIR@
/* Open a directory stream visiting the given directory file
descriptor. Return NULL and set errno if fd is not visiting a
directory. On success, this function consumes fd (it will be
implicitly closed either by this function or by a subsequent
closedir). */
# if @REPLACE_FDOPENDIR@
# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
# undef fdopendir
# define fdopendir rpl_fdopendir
# endif
_GL_FUNCDECL_RPL (fdopendir, DIR *, (int fd));
_GL_CXXALIAS_RPL (fdopendir, DIR *, (int fd));
# else
# if !@HAVE_FDOPENDIR@ || !@HAVE_DECL_FDOPENDIR@
_GL_FUNCDECL_SYS (fdopendir, DIR *, (int fd));
# endif
_GL_CXXALIAS_SYS (fdopendir, DIR *, (int fd));
# endif
_GL_CXXALIASWARN (fdopendir);
#elif defined GNULIB_POSIXCHECK
# undef fdopendir
# if HAVE_RAW_DECL_FDOPENDIR
_GL_WARN_ON_USE (fdopendir, "fdopendir is unportable - "
"use gnulib module fdopendir for portability");
# endif
#endif
#if @GNULIB_SCANDIR@
/* Scan the directory DIR, calling FILTER on each directory entry.
Entries for which FILTER returns nonzero are individually malloc'd,
sorted using qsort with CMP, and collected in a malloc'd array in
*NAMELIST. Returns the number of entries selected, or -1 on error. */
# if !@HAVE_SCANDIR@
_GL_FUNCDECL_SYS (scandir, int,
(const char *dir, struct dirent ***namelist,
int (*filter) (const struct dirent *),
int (*cmp) (const struct dirent **, const struct dirent **))
_GL_ARG_NONNULL ((1, 2, 4)));
# endif
/* Need to cast, because on glibc systems, the fourth parameter is
int (*cmp) (const void *, const void *). */
_GL_CXXALIAS_SYS_CAST (scandir, int,
(const char *dir, struct dirent ***namelist,
int (*filter) (const struct dirent *),
int (*cmp) (const struct dirent **, const struct dirent **)));
_GL_CXXALIASWARN (scandir);
#elif defined GNULIB_POSIXCHECK
# undef scandir
# if HAVE_RAW_DECL_SCANDIR
_GL_WARN_ON_USE (scandir, "scandir is unportable - "
"use gnulib module scandir for portability");
# endif
#endif
#if @GNULIB_ALPHASORT@
/* Compare two 'struct dirent' entries alphabetically. */
# if !@HAVE_ALPHASORT@
_GL_FUNCDECL_SYS (alphasort, int,
(const struct dirent **, const struct dirent **)
_GL_ATTRIBUTE_PURE
_GL_ARG_NONNULL ((1, 2)));
# endif
/* Need to cast, because on glibc systems, the parameters are
(const void *, const void *). */
_GL_CXXALIAS_SYS_CAST (alphasort, int,
(const struct dirent **, const struct dirent **));
_GL_CXXALIASWARN (alphasort);
#elif defined GNULIB_POSIXCHECK
# undef alphasort
# if HAVE_RAW_DECL_ALPHASORT
_GL_WARN_ON_USE (alphasort, "alphasort is unportable - "
"use gnulib module alphasort for portability");
# endif
#endif
#endif /* _@GUARD_PREFIX@_DIRENT_H */
#endif /* _@GUARD_PREFIX@_DIRENT_H */
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