mirror of
https://git.savannah.gnu.org/git/tar.git
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Prepare for implementing extended attribute support.
This patch adds *xattr() stubs in case extended attribute support is not present and implements the *attrat() family of functions. Based on the patch by Pavel Raiskup <pavel@raiskup.cz> for gnulib. * acinclude.m4 (TAR_HEADERS_ATTR_XATTR_H): New defun. * configure.ac: Call TAR_HEADERS_ATTR_XATTR_H * lib/Makefile.am: Add xattr-at.[ch], distribute attr-xattr.in.h [!TAR_COND_XATTR_H]: Build attr/xattr.h * lib/attr-xattr.in.h: New file. * lib/xattr-at.c: New file. * lib/xattr-at.h: New file.
This commit is contained in:
Sergey Poznyakoff
+15
-2
@@ -28,11 +28,24 @@ BUILT_SOURCES = rmt-command.h
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CLEANFILES = rmt-command.h rmt-command.h-t
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INCLUDES = -I$(top_srcdir)/gnu -I../ -I../gnu
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noinst_HEADERS = system.h system-ioctl.h rmt.h paxlib.h stdopen.h
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noinst_HEADERS = system.h system-ioctl.h rmt.h paxlib.h stdopen.h xattr-at.h
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libtar_a_SOURCES = \
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paxerror.c paxexit-status.c paxlib.h paxnames.c \
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prepargs.c prepargs.h \
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rtapelib.c \
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rmt.h \
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stdopen.c stdopen.h \
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system.h system-ioctl.h
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system.h system-ioctl.h \
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xattr-at.c
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if !TAR_COND_XATTR_H
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BUILT_SOURCES += attr/xattr.h
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attr/xattr.h: attr-xattr.in.h $(top_builddir)/config.status
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$(AM_V_at)$(MKDIR_P) attr
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$(AM_V_GEN)rm -f $@-t $@ && \
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cp $(srcdir)/attr-xattr.in.h attr/xattr.h
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MOSTLYCLEANFILES = attr/xattr.h attr/xattr.h
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endif
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EXTRA_DIST = attr-xattr.in.h
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@@ -0,0 +1,58 @@
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/* Replacement <attr/xattr.h> for platforms that lack it.
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Copyright (C) 2012 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef TAR_ATTR_XATTR_H
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#define TAR_ATTR_XATTR_H
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#include <errno.h>
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/* setting */
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static inline int setxattr (const char *path, const char *name, const void
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*value, size_t size, int flags)
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{ errno = ENOTSUP; return -1; }
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static inline int lsetxattr (const char *path, const char *name, const void
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*value, size_t size, int flags)
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{ errno = ENOTSUP; return -1; }
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static inline int fsetxattr (int filedes, const char *name, const void *value,
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size_t size, int flags)
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{ errno = ENOTSUP; return -1; }
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/* getting */
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static inline ssize_t getxattr (const char *path, const char *name, void *value,
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size_t size)
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{ errno = ENOTSUP; return -1; }
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static inline ssize_t lgetxattr (const char *path, const char *name, void
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*value, size_t size)
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{ errno = ENOTSUP; return -1; }
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static inline ssize_t fgetxattr (int filedes, const char *name, void *value,
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size_t size)
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{ errno = ENOTSUP; return -1; }
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/* listing */
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static inline ssize_t listxattr (const char *path, char *list, size_t size)
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{ errno = ENOTSUP; return -1; }
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static inline ssize_t llistxattr (const char *path, char *list, size_t size)
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{ errno = ENOTSUP; return -1; }
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static inline ssize_t flistxattr (int filedes, char *list, size_t size)
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{ errno = ENOTSUP; return -1; }
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#endif
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+110
@@ -0,0 +1,110 @@
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/* openat-style fd-relative functions for operating with extended file
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attributes.
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Copyright (C) 2012 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include "xattr-at.h"
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#include "openat.h"
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
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#include "save-cwd.h"
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#include "openat-priv.h"
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/* setxattrat */
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#define AT_FUNC_NAME setxattrat
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#define AT_FUNC_F1 setxattr
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#define AT_FUNC_POST_FILE_PARAM_DECLS , const char *name, const void *value \
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, size_t size, int flags
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#define AT_FUNC_POST_FILE_ARGS , name, value, size, flags
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#include "at-func.c"
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#undef AT_FUNC_NAME
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#undef AT_FUNC_F1
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#undef AT_FUNC_POST_FILE_PARAM_DECLS
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#undef AT_FUNC_POST_FILE_ARGS
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/* lsetxattrat */
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#define AT_FUNC_NAME lsetxattrat
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#define AT_FUNC_F1 lsetxattr
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#define AT_FUNC_POST_FILE_PARAM_DECLS , const char *name, const void *value \
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, size_t size, int flags
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#define AT_FUNC_POST_FILE_ARGS , name, value, size, flags
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#include "at-func.c"
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#undef AT_FUNC_NAME
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#undef AT_FUNC_F1
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#undef AT_FUNC_POST_FILE_PARAM_DECLS
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#undef AT_FUNC_POST_FILE_ARGS
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/* getxattrat */
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#define AT_FUNC_NAME getxattrat
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#define AT_FUNC_RESULT ssize_t
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#define AT_FUNC_F1 getxattr
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#define AT_FUNC_POST_FILE_PARAM_DECLS , const char *name, void *value \
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, size_t size
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#define AT_FUNC_POST_FILE_ARGS , name, value, size
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#include "at-func.c"
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#undef AT_FUNC_NAME
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#undef AT_FUNC_F1
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#undef AT_FUNC_RESULT
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#undef AT_FUNC_POST_FILE_PARAM_DECLS
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#undef AT_FUNC_POST_FILE_ARGS
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/* lgetxattrat */
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#define AT_FUNC_NAME lgetxattrat
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#define AT_FUNC_RESULT ssize_t
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#define AT_FUNC_F1 lgetxattr
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#define AT_FUNC_POST_FILE_PARAM_DECLS , const char *name, void *value \
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, size_t size
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#define AT_FUNC_POST_FILE_ARGS , name, value, size
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#include "at-func.c"
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#undef AT_FUNC_NAME
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#undef AT_FUNC_F1
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#undef AT_FUNC_RESULT
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#undef AT_FUNC_POST_FILE_PARAM_DECLS
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#undef AT_FUNC_POST_FILE_ARGS
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/* listxattrat */
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#define AT_FUNC_NAME listxattrat
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#define AT_FUNC_RESULT ssize_t
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#define AT_FUNC_F1 listxattr
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#define AT_FUNC_POST_FILE_PARAM_DECLS , char *list , size_t size
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#define AT_FUNC_POST_FILE_ARGS , list , size
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#include "at-func.c"
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#undef AT_FUNC_NAME
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#undef AT_FUNC_F1
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#undef AT_FUNC_RESULT
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#undef AT_FUNC_POST_FILE_PARAM_DECLS
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#undef AT_FUNC_POST_FILE_ARGS
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/* llistxattrat */
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#define AT_FUNC_NAME llistxattrat
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#define AT_FUNC_RESULT ssize_t
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#define AT_FUNC_F1 llistxattr
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#define AT_FUNC_POST_FILE_PARAM_DECLS , char *list , size_t size
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#define AT_FUNC_POST_FILE_ARGS , list , size
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#include "at-func.c"
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#undef AT_FUNC_NAME
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#undef AT_FUNC_F1
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#undef AT_FUNC_RESULT
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#undef AT_FUNC_POST_FILE_PARAM_DECLS
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#undef AT_FUNC_POST_FILE_ARGS
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@@ -0,0 +1,66 @@
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/* Prototypes for openat-style fd-relative functions for operating with
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extended file attributes.
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Copyright (C) 2012 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef XATTRS_AT_H
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#define XATTRS_AT_H
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#include <sys/types.h>
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#include <attr/xattr.h>
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/* These are the dir-fd-relative variants of the functions without the
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"at" suffix. For example, setxattrat (AT_FDCWD, path, name, value, size,
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flags &c) is usually equivalent to setxattr (file, name, value, size,
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flags). For more info use the setxattr(2), getxattr(2) or listxattr(2)
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manpages. */
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/* dir-fd-relative setxattr. Operation sets the VALUE of the extended
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attribute identified by NAME and associated with the given PATH in the
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filesystem relatively to directory identified by DIR_FD. See the
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setxattr(2) manpage for the description of all parameters. */
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int setxattrat (int dir_fd, const char *path, const char *name,
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const void *value, size_t size, int flags);
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/* dir-fd-relative lsetxattr. This function is just like setxattrat,
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except when DIR_FD and FILE specify a symlink: lsetxattrat operates on the
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symlink, while the setxattrat operates on the referent of the symlink. */
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int lsetxattrat (int dir_fd, const char *path, const char *name,
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const void *value, size_t size, int flags);
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/* dir-fd-relative getxattr. Operation gets the VALUE of the extended
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attribute idenfified by NAME and associated with the given PATH in the
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filesystem relatively to directory identified by DIR_FD. For more info
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about all parameters see the getxattr(2) manpage. */
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ssize_t getxattrat (int dir_fd, const char *path, const char *name,
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void *value, size_t size);
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/* dir-fd-relative lgetxattr. This function is just like getxattrat,
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except when DIR_FD and FILE specify a symlink: lgetxattrat operates on the
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symlink, while the getxattrat operates on the referent of the symlink. */
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ssize_t lgetxattrat (int dir_fd, const char *path, const char *name,
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void *value, size_t size);
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/* dir-fd-relative listxattr. Obtain the list of extended attrubtes names. For
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more info see the listxattr(2) manpage. */
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ssize_t listxattrat (int dir_fd, const char *path, char *list, size_t size);
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/* dir-fd-relative llistxattr. This function is just like listxattrat,
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except when DIR_FD and FILE specify a symlink: llistxattr operates on the
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symlink, while the listxattrat operates on the referent of the symlink. */
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ssize_t llistxattrat (int dir_fd, const char *path, char *list, size_t size);
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#endif /* XATTRS_AT_H */
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