sysdeps/unix/sysv/linux/fchmodat.c

   1 /* Change the protections of file relative to open directory.  Linux version.
   2    Copyright (C) 2006-2018 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <stddef.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <sys/types.h>
  26 #include <alloca.h>
  27 #include <sysdep.h>
  28
  29 int
  30 fchmodat (int fd, const char *file, mode_t mode, int flag)
  31 {
  32   if (flag & ~AT_SYMLINK_NOFOLLOW)
  33     return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
  34 #ifndef __NR_lchmod             /* Linux so far has no lchmod syscall.  */
  35   if (flag & AT_SYMLINK_NOFOLLOW)
  36     return INLINE_SYSCALL_ERROR_RETURN_VALUE (ENOTSUP);
  37 #endif
  38
  39   return INLINE_SYSCALL (fchmodat, 3, fd, file, mode);
  40 }