sysdeps/unix/sysv/linux/fchmodat.c

   1 /* Change the protections of file relative to open directory.  Linux version.
   2    Copyright (C) 2006-2015 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 (fd, file, mode, flag)
  31      int fd;
  32      const char *file;
  33      mode_t mode;
  34      int flag;
  35 {
  36   if (flag & ~AT_SYMLINK_NOFOLLOW)
  37     {
  38       __set_errno (EINVAL);
  39       return -1;
  40     }
  41 #ifndef __NR_lchmod             /* Linux so far has no lchmod syscall.  */
  42   if (flag & AT_SYMLINK_NOFOLLOW)
  43     {
  44       __set_errno (ENOTSUP);
  45       return -1;
  46     }
  47 #endif
  48
  49   return INLINE_SYSCALL (fchmodat, 3, fd, file, mode);
  50 }