sysdeps/unix/sysv/linux/openat64.c

   1 /* Linux openat syscall implementation, LFS.
   2    Copyright (C) 2007-2018 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 <fcntl.h>
  20 #include <stdarg.h>
  21
  22 #include <sysdep-cancel.h>
  23
  24 #ifdef __OFF_T_MATCHES_OFF64_T
  25 # define EXTRA_OPEN_FLAGS 0
  26 #else
  27 # define EXTRA_OPEN_FLAGS O_LARGEFILE
  28 #endif
  29
  30 /* Open FILE with access OFLAG.  Interpret relative paths relative to
  31    the directory associated with FD.  If OFLAG includes O_CREAT or
  32    O_TMPFILE, a fourth argument is the file protection.  */
  33 int
  34 __libc_openat64 (int fd, const char *file, int oflag, ...)
  35 {
  36   mode_t mode = 0;
  37   if (__OPEN_NEEDS_MODE (oflag))
  38     {
  39       va_list arg;
  40       va_start (arg, oflag);
  41       mode = va_arg (arg, mode_t);
  42       va_end (arg);
  43     }
  44
  45   return SYSCALL_CANCEL (openat, fd, file, oflag | EXTRA_OPEN_FLAGS, mode);
  46 }
  47
  48 strong_alias (__libc_openat64, __openat64)
  49 libc_hidden_weak (__openat64)
  50 weak_alias (__libc_openat64, openat64)
  51
  52 #ifdef __OFF_T_MATCHES_OFF64_T
  53 strong_alias (__libc_openat64, __openat)
  54 libc_hidden_weak (__openat)
  55 weak_alias (__libc_openat64, openat)
  56 #endif