The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/sys/msg.h


$ cat -n /usr/include/x86_64-linux-gnu/sys/msg.h

     1	/* Copyright (C) 1995-2024 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	#ifndef __USE_TIME_BITS64
    62	extern int msgctl (int __msqid, int __cmd, struct msqid_ds *__buf) __THROW;
    63	#else
    64	# ifdef __REDIRECT_NTH
    65	extern int __REDIRECT_NTH (msgctl,
    66	                           (int __msqid, int __cmd, struct msqid_ds *__buf),
    67	                           __msgctl64);
    68	# else
    69	#  define msgctl __msgctl64
    70	# endif
    71	#endif
    72	
    73	/* Get messages queue.  */
    74	extern int msgget (key_t __key, int __msgflg) __THROW;
    75	
    76	/* Receive message from message queue.
    77	
    78	   This function is a cancellation point and therefore not marked with
    79	   __THROW.  */
    80	extern ssize_t msgrcv (int __msqid, void *__msgp, size_t __msgsz,
    81			       long int __msgtyp, int __msgflg);
    82	
    83	/* Send message to message queue.
    84	
    85	   This function is a cancellation point and therefore not marked with
    86	   __THROW.  */
    87	extern int msgsnd (int __msqid, const void *__msgp, size_t __msgsz,
    88			   int __msgflg);
    89	
    90	__END_DECLS
    91	
    92	#endif /* sys/msg.h */