sysdeps/unix/sysv/linux/generic/open.c

   1 /* Copyright (C) 2011-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   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 <stdarg.h>
  22 #include <stdio.h>
  23 #include <sysdep-cancel.h>
  24
  25 /* Open FILE with access OFLAG.  If OFLAG includes O_CREAT,
  26    a third argument is the file protection.  */
  27 int
  28 __libc_open (const char *file, int oflag, ...)
  29 {
  30   int mode = 0;
  31
  32   if (oflag & O_CREAT)
  33     {
  34       va_list arg;
  35       va_start (arg, oflag);
  36       mode = va_arg (arg, int);
  37       va_end (arg);
  38     }
  39
  40   if (SINGLE_THREAD_P)
  41     return INLINE_SYSCALL (openat, 4, AT_FDCWD, file, oflag, mode);
  42
  43   int oldtype = LIBC_CANCEL_ASYNC ();
  44
  45   int result = INLINE_SYSCALL (openat, 4, AT_FDCWD, file, oflag, mode);
  46
  47   LIBC_CANCEL_RESET (oldtype);
  48
  49   return result;
  50 }
  51 libc_hidden_def (__libc_open)
  52
  53 weak_alias (__libc_open, __open)
  54 libc_hidden_weak (__open)
  55 weak_alias (__libc_open, open)
  56
  57 int
  58 __open_nocancel (const char *file, int oflag, ...)
  59 {
  60   int mode = 0;
  61
  62   if (oflag & O_CREAT)
  63     {
  64       va_list arg;
  65       va_start (arg, oflag);
  66       mode = va_arg (arg, int);
  67       va_end (arg);
  68     }
  69
  70   return INLINE_SYSCALL (openat, 4, AT_FDCWD, file, oflag, mode);
  71 }