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120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/* provide a replacement openat function
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Copyright (C) 2004, 2005, 2006 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 2, or (at your option)
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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, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* written by Jim Meyering */
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <stdbool.h>
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#ifndef __attribute__
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# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
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# define __attribute__(x) /* empty */
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# endif
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#endif
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#ifndef ATTRIBUTE_NORETURN
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# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
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#endif
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/* Work around a bug in Solaris 9 and 10: AT_FDCWD is positive. Its
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value exceeds INT_MAX, so its use as an int doesn't conform to the
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C standard, and GCC and Sun C complain in some cases. If the bug
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is present, undef AT_FDCWD here, so it can be redefined below. */
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#if 0 < AT_FDCWD && AT_FDCWD == 0xffd19553
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# undef AT_FDCWD
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#endif
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/* Use the same bit pattern as Solaris 9, but with the proper
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signedness. The bit pattern is important, in case this actually is
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Solaris with the above workaround. */
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#ifndef AT_FDCWD
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# define AT_FDCWD (-3041965)
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#endif
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/* Use the same values as Solaris 9. This shouldn't matter, but
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there's no real reason to differ. */
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#ifndef AT_SYMLINK_NOFOLLOW
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# define AT_SYMLINK_NOFOLLOW 4096
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# define AT_REMOVEDIR 1
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#endif
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#ifdef __OPENAT_PREFIX
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# undef openat
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# define __OPENAT_CONCAT(x, y) x ## y
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# define __OPENAT_XCONCAT(x, y) __OPENAT_CONCAT (x, y)
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# define __OPENAT_ID(y) __OPENAT_XCONCAT (__OPENAT_PREFIX, y)
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# define openat __OPENAT_ID (openat)
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int openat (int fd, char const *file, int flags, /* mode_t mode */ ...);
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int openat_permissive (int fd, char const *file, int flags, mode_t mode,
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int *cwd_errno);
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# if ! HAVE_FDOPENDIR
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# define fdopendir __OPENAT_ID (fdopendir)
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# endif
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DIR *fdopendir (int fd);
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# define fstatat __OPENAT_ID (fstatat)
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int fstatat (int fd, char const *file, struct stat *st, int flag);
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# define unlinkat __OPENAT_ID (unlinkat)
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int unlinkat (int fd, char const *file, int flag);
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#else
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# define openat_permissive(Fd, File, Flags, Mode, Cwd_errno) \
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openat (Fd, File, Flags, Mode)
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#endif
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int mkdirat (int fd, char const *file, mode_t mode);
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void openat_restore_fail (int) ATTRIBUTE_NORETURN;
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void openat_save_fail (int) ATTRIBUTE_NORETURN;
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int fchmodat (int fd, char const *file, mode_t mode, int flag);
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int fchownat (int fd, char const *file, uid_t owner, gid_t group, int flag);
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/* Using these function names makes application code
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slightly more readable than it would be with
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fchownat (..., 0) or fchownat (..., AT_SYMLINK_NOFOLLOW). */
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static inline int
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chownat (int fd, char const *file, uid_t owner, gid_t group)
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{
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return fchownat (fd, file, owner, group, 0);
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}
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static inline int
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lchownat (int fd, char const *file, uid_t owner, gid_t group)
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{
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return fchownat (fd, file, owner, group, AT_SYMLINK_NOFOLLOW);
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}
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static inline int
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chmodat (int fd, char const *file, mode_t mode)
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{
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return fchmodat (fd, file, mode, 0);
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}
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static inline int
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lchmodat (int fd, char const *file, mode_t mode)
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{
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return fchmodat (fd, file, mode, AT_SYMLINK_NOFOLLOW);
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}
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bool openat_needs_fchdir (void);
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