glibc (2.38)

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       1  /* Checking macros for mq functions.
       2     Copyright (C) 2007-2023 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  #ifndef	_FCNTL_H
      20  # error "Never include <bits/mqueue2.h> directly; use <mqueue.h> instead."
      21  #endif
      22  
      23  /* Check that calls to mq_open with O_CREAT set have an appropriate third and fourth
      24     parameter.  */
      25  extern mqd_t mq_open (const char *__name, int __oflag, ...)
      26       __THROW __nonnull ((1));
      27  extern mqd_t __mq_open_2 (const char *__name, int __oflag)
      28       __THROW __nonnull ((1));
      29  extern mqd_t __REDIRECT_NTH (__mq_open_alias, (const char *__name,
      30  					       int __oflag, ...), mq_open)
      31       __nonnull ((1));
      32  __errordecl (__mq_open_wrong_number_of_args,
      33  	     "mq_open can be called either with 2 or 4 arguments");
      34  __errordecl (__mq_open_missing_mode_and_attr,
      35  	     "mq_open with O_CREAT in second argument needs 4 arguments");
      36  
      37  __fortify_function mqd_t
      38  __NTH (mq_open (const char *__name, int __oflag, ...))
      39  {
      40    if (__va_arg_pack_len () != 0 && __va_arg_pack_len () != 2)
      41      __mq_open_wrong_number_of_args ();
      42  
      43    if (__builtin_constant_p (__oflag))
      44      {
      45        if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () == 0)
      46  	{
      47  	  __mq_open_missing_mode_and_attr ();
      48  	  return __mq_open_2 (__name, __oflag);
      49  	}
      50        return __mq_open_alias (__name, __oflag, __va_arg_pack ());
      51      }
      52  
      53    if (__va_arg_pack_len () == 0)
      54      return __mq_open_2 (__name, __oflag);
      55  
      56    return __mq_open_alias (__name, __oflag, __va_arg_pack ());
      57  }