sysdeps/unix/sysv/linux/openat64.c

   1 /* Linux openat syscall implementation, LFS.
   2    Copyright (C) 2007-2022 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <fcntl.h>
  20 #include <stdarg.h>
  21
  22 #include <sysdep-cancel.h>
  23
  24 /* Open FILE with access OFLAG.  Interpret relative paths relative to
  25    the directory associated with FD.  If OFLAG includes O_CREAT or
  26    O_TMPFILE, a fourth argument is the file protection.  */
  27 int
  28 __libc_openat64 (int fd, const char *file, int oflag, ...)
  29 {
  30   mode_t mode = 0;
  31   if (__OPEN_NEEDS_MODE (oflag))
  32     {
  33       va_list arg;
  34       va_start (arg, oflag);
  35       mode = va_arg (arg, mode_t);
  36       va_end (arg);
  37     }
  38
  39   return SYSCALL_CANCEL (openat, fd, file, oflag | O_LARGEFILE, mode);
  40 }
  41
  42 strong_alias (__libc_openat64, __openat64)
  43 libc_hidden_weak (__openat64)
  44 weak_alias (__libc_openat64, openat64)
  45
  46 #ifdef __OFF_T_MATCHES_OFF64_T
  47 strong_alias (__libc_openat64, __openat)
  48 libc_hidden_weak (__openat)
  49 weak_alias (__libc_openat64, openat)
  50 #endif