sysdeps/unix/sysv/linux/open64.c

   1 /* Copyright (C) 1991-2018 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sys/types.h>
  19 #include <sys/stat.h>
  20 #include <fcntl.h>
  21 #include <stdarg.h>
  22
  23 #include <sysdep-cancel.h>
  24 #include <not-cancel.h>
  25
  26 #ifdef __OFF_T_MATCHES_OFF64_T
  27 # define EXTRA_OPEN_FLAGS 0
  28 #else
  29 # define EXTRA_OPEN_FLAGS O_LARGEFILE
  30 #endif
  31
  32 /* Open FILE with access OFLAG.  If O_CREAT or O_TMPFILE is in OFLAG,
  33    a third argument is the file protection.  */
  34 int
  35 __libc_open64 (const char *file, int oflag, ...)
  36 {
  37   int mode = 0;
  38
  39   if (__OPEN_NEEDS_MODE (oflag))
  40     {
  41       va_list arg;
  42       va_start (arg, oflag);
  43       mode = va_arg (arg, int);
  44       va_end (arg);
  45     }
  46
  47   return SYSCALL_CANCEL (openat, AT_FDCWD, file, oflag | EXTRA_OPEN_FLAGS,
  48                          mode);
  49 }
  50
  51 strong_alias (__libc_open64, __open64)
  52 libc_hidden_weak (__open64)
  53 weak_alias (__libc_open64, open64)
  54
  55 # if !IS_IN (rtld)
  56 int
  57 __open64_nocancel (const char *file, int oflag, ...)
  58 {
  59   int mode = 0;
  60
  61   if (__OPEN_NEEDS_MODE (oflag))
  62     {
  63       va_list arg;
  64       va_start (arg, oflag);
  65       mode = va_arg (arg, int);
  66       va_end (arg);
  67     }
  68
  69   return INLINE_SYSCALL_CALL (openat, AT_FDCWD, file, oflag | EXTRA_OPEN_FLAGS,
  70                               mode);
  71 }
  72 #else
  73 strong_alias (__libc_open64, __open64_nocancel)
  74 #endif
  75 libc_hidden_def (__open64_nocancel)
  76
  77 #ifdef __OFF_T_MATCHES_OFF64_T
  78 strong_alias (__libc_open64, __libc_open)
  79 strong_alias (__libc_open64, __open)
  80 libc_hidden_weak (__open)
  81 weak_alias (__libc_open64, open)
  82
  83 strong_alias (__open64_nocancel, __open_nocancel)
  84 libc_hidden_weak (__open_nocancel)
  85 #endif