/usr/include/x86_64-linux-gnu/sys/msg.h is in libc6-dev 2.15-0ubuntu10.18.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | /* Copyright (C) 1995-1997,1999,2000,2003,2006,2007
Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _SYS_MSG_H
#define _SYS_MSG_H
#include <features.h>
#define __need_size_t
#include <stddef.h>
/* Get common definition of System V style IPC. */
#include <sys/ipc.h>
/* Get system dependent definition of `struct msqid_ds' and more. */
#include <bits/msq.h>
/* Define types required by the standard. */
#define __need_time_t
#include <time.h>
#ifndef __pid_t_defined
typedef __pid_t pid_t;
# define __pid_t_defined
#endif
#ifndef __ssize_t_defined
typedef __ssize_t ssize_t;
# define __ssize_t_defined
#endif
/* The following System V style IPC functions implement a message queue
system. The definition is found in XPG2. */
#ifdef __USE_GNU
/* Template for struct to be used as argument for `msgsnd' and `msgrcv'. */
struct msgbuf
{
long int mtype; /* type of received/sent message */
char mtext[1]; /* text of the message */
};
#endif
__BEGIN_DECLS
/* Message queue control operation. */
extern int msgctl (int __msqid, int __cmd, struct msqid_ds *__buf) __THROW;
/* Get messages queue. */
extern int msgget (key_t __key, int __msgflg) __THROW;
/* Receive message from message queue.
This function is a cancellation point and therefore not marked with
__THROW. */
extern ssize_t msgrcv (int __msqid, void *__msgp, size_t __msgsz,
long int __msgtyp, int __msgflg);
/* Send message to message queue.
This function is a cancellation point and therefore not marked with
__THROW. */
extern int msgsnd (int __msqid, __const void *__msgp, size_t __msgsz,
int __msgflg);
__END_DECLS
#endif /* sys/msg.h */
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