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1 | /* Copyright (C) 1995-2019 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 | <https://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #ifndef _SYS_MSG_H | |
19 | #define _SYS_MSG_H | |
20 | ||
21 | #include <features.h> | |
22 | ||
23 | #define __need_size_t | |
24 | #include <stddef.h> | |
25 | ||
26 | /* Get common definition of System V style IPC. */ | |
27 | #include <sys/ipc.h> | |
28 | ||
29 | /* Get system dependent definition of `struct msqid_ds' and more. */ | |
30 | #include <bits/msq.h> | |
31 | ||
32 | /* Define types required by the standard. */ | |
33 | #include <bits/types/time_t.h> | |
34 | ||
35 | #ifndef __pid_t_defined | |
36 | typedef __pid_t pid_t; | |
37 | # define __pid_t_defined | |
38 | #endif | |
39 | ||
40 | #ifndef __ssize_t_defined | |
41 | typedef __ssize_t ssize_t; | |
42 | # define __ssize_t_defined | |
43 | #endif | |
44 | ||
45 | /* The following System V style IPC functions implement a message queue | |
46 | system. The definition is found in XPG2. */ | |
47 | ||
48 | #ifdef __USE_GNU | |
49 | /* Template for struct to be used as argument for `msgsnd' and `msgrcv'. */ | |
50 | struct msgbuf | |
51 | { | |
52 | __syscall_slong_t mtype; /* type of received/sent message */ | |
53 | char mtext[1]; /* text of the message */ | |
54 | }; | |
55 | #endif | |
56 | ||
57 | ||
58 | __BEGIN_DECLS | |
59 | ||
60 | /* Message queue control operation. */ | |
61 | extern int msgctl (int __msqid, int __cmd, struct msqid_ds *__buf) __THROW; | |
62 | ||
63 | /* Get messages queue. */ | |
64 | extern int msgget (key_t __key, int __msgflg) __THROW; | |
65 | ||
66 | /* Receive message from message queue. | |
67 | ||
68 | This function is a cancellation point and therefore not marked with | |
69 | __THROW. */ | |
70 | extern ssize_t msgrcv (int __msqid, void *__msgp, size_t __msgsz, | |
71 | long int __msgtyp, int __msgflg); | |
72 | ||
73 | /* Send message to message queue. | |
74 | ||
75 | This function is a cancellation point and therefore not marked with | |
76 | __THROW. */ | |
77 | extern int msgsnd (int __msqid, const void *__msgp, size_t __msgsz, | |
78 | int __msgflg); | |
79 | ||
80 | __END_DECLS | |
81 | ||
82 | #endif /* sys/msg.h */ |