1 /* Checking macros for mq functions.
2 Copyright (C) 2007-2021 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
__NTH(mq_open (const char * __name,int __oflag,...))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 }
58