rt/bits/mqueue2.h

   1 /* Checking macros for mq functions.
   2    Copyright (C) 2007, 2011, 2012 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _FCNTL_H
  21 # error "Never include <bits/mqueue2.h> directly; use <mqueue.h> instead."
  22 #endif
  23
  24 /* Check that calls to mq_open with O_CREAT set have an appropriate third and fourth
  25    parameter.  */
  26 extern mqd_t mq_open (const char *__name, int __oflag, ...)
  27      __THROW __nonnull ((1));
  28 extern mqd_t __mq_open_2 (const char *__name, int __oflag)
  29      __THROW __nonnull ((1));
  30 extern mqd_t __REDIRECT_NTH (__mq_open_alias, (const char *__name,
  31                                                int __oflag, ...), mq_open)
  32      __nonnull ((1));
  33 __errordecl (__mq_open_wrong_number_of_args,
  34              "mq_open can be called either with 2 or 4 arguments");
  35 __errordecl (__mq_open_missing_mode_and_attr,
  36              "mq_open with O_CREAT in second argument needs 4 arguments");
  37
  38 __extern_always_inline mqd_t
  39 __NTH (mq_open (const char *__name, int __oflag, ...))
  40 {
  41   if (__va_arg_pack_len () != 0 && __va_arg_pack_len () != 2)
  42     __mq_open_wrong_number_of_args ();
  43
  44   if (__builtin_constant_p (__oflag))
  45     {
  46       if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () == 0)
  47         {
  48           __mq_open_missing_mode_and_attr ();
  49           return __mq_open_2 (__name, __oflag);
  50         }
  51       return __mq_open_alias (__name, __oflag, __va_arg_pack ());
  52     }
  53
  54   if (__va_arg_pack_len () == 0)
  55     return __mq_open_2 (__name, __oflag);
  56
  57   return __mq_open_alias (__name, __oflag, __va_arg_pack ());
  58 }