openat.h 2.99 KB
Newer Older
1
/* provide a replacement openat function
Paul Eggert's avatar
Paul Eggert committed
2
   Copyright (C) 2004-2006, 2008-2019 Free Software Foundation, Inc.
3 4 5 6 7 8 9 10 11 12 13 14

   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
Paul Eggert's avatar
Paul Eggert committed
15
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
16 17 18 19 20 21 22 23 24 25 26 27 28

/* written by Jim Meyering */

#ifndef _GL_HEADER_OPENAT
#define _GL_HEADER_OPENAT

#include <fcntl.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdbool.h>

Paul Eggert's avatar
Paul Eggert committed
29 30 31
#ifndef _GL_INLINE_HEADER_BEGIN
 #error "Please include config.h first."
#endif
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123
_GL_INLINE_HEADER_BEGIN

#if !HAVE_OPENAT

int openat_permissive (int fd, char const *file, int flags, mode_t mode,
                       int *cwd_errno);
bool openat_needs_fchdir (void);

#else

# define openat_permissive(Fd, File, Flags, Mode, Cwd_errno) \
    openat (Fd, File, Flags, Mode)
# define openat_needs_fchdir() false

#endif

_Noreturn void openat_restore_fail (int);
_Noreturn void openat_save_fail (int);

/* Using these function names makes application code
   slightly more readable than it would be with
   fchownat (..., 0) or fchownat (..., AT_SYMLINK_NOFOLLOW).  */

#if GNULIB_FCHOWNAT

# ifndef FCHOWNAT_INLINE
#  define FCHOWNAT_INLINE _GL_INLINE
# endif

FCHOWNAT_INLINE int
chownat (int fd, char const *file, uid_t owner, gid_t group)
{
  return fchownat (fd, file, owner, group, 0);
}

FCHOWNAT_INLINE int
lchownat (int fd, char const *file, uid_t owner, gid_t group)
{
  return fchownat (fd, file, owner, group, AT_SYMLINK_NOFOLLOW);
}

#endif

#if GNULIB_FCHMODAT

# ifndef FCHMODAT_INLINE
#  define FCHMODAT_INLINE _GL_INLINE
# endif

FCHMODAT_INLINE int
chmodat (int fd, char const *file, mode_t mode)
{
  return fchmodat (fd, file, mode, 0);
}

FCHMODAT_INLINE int
lchmodat (int fd, char const *file, mode_t mode)
{
  return fchmodat (fd, file, mode, AT_SYMLINK_NOFOLLOW);
}

#endif

#if GNULIB_STATAT

# ifndef STATAT_INLINE
#  define STATAT_INLINE _GL_INLINE
# endif

STATAT_INLINE int
statat (int fd, char const *name, struct stat *st)
{
  return fstatat (fd, name, st, 0);
}

STATAT_INLINE int
lstatat (int fd, char const *name, struct stat *st)
{
  return fstatat (fd, name, st, AT_SYMLINK_NOFOLLOW);
}

#endif

/* For now, there are no wrappers named laccessat or leuidaccessat,
   since gnulib doesn't support faccessat(,AT_SYMLINK_NOFOLLOW) and
   since access rights on symlinks are of limited utility.  Likewise,
   wrappers are not provided for accessat or euidaccessat, so as to
   avoid dragging in -lgen on some platforms.  */

_GL_INLINE_HEADER_END

#endif /* _GL_HEADER_OPENAT */