Coherent4.2.10/include/sys/msg.h

/* (-lgl
 *	Coherent 386 release 4.2
 *	Copyright (c) 1982, 1993 by Mark Williams Company.
 *	All rights reserved. May not be copied without permission.
 *	For copying permission and licensing info, write licensing@mwc.com
 -lgl) */

#ifndef __SYS_MSG_H__
#define	__SYS_MSG_H__

#include <common/feature.h>
#include <common/ccompat.h>
#include <common/__pid.h>
#include <common/__time.h>
#include <common/__size.h>
#include <common/_imode.h>
#include <common/_time.h>
#include <common/_ipcperm.h>

/*
 * ipc_perm Mode Definitions.
 */

#define	MSG_RWAIT	01000	/* a reader is waiting for a message */
#define	MSG_WWAIT	02000	/* a writer is waiting to send */


/*
 * Message Operation Flags.
 */

#define	MSG_NOERROR	010000	/* no error if big message */


/*
 * There is one msg queue id data structure for each q in the system.
 */

#if	_SYSV4

struct msqid_ds {
	struct ipc_perm	msg_perm;	/* operation permission struct */
	struct msg    *	msg_first;	/* ptr to first message on q */
	struct msg    *	msg_last;	/* ptr to last message on q */
	unsigned long	msg_cbytes;	/* current # bytes on q */
	unsigned long	msg_qnum;	/* # of messages on q */
	unsigned long	msg_qbytes;	/* max # of bytes on q */
	__pid_t		msg_lspid;	/* pid of last msgsnd */
	__pid_t		msg_lrpid;	/* pid of last msgrcv */
	__time_t	msg_stime;	/* last msgsnd time */
	long		__pad1;
	__time_t	msg_rtime;	/* last msgrcv time */
	long		__pad2;
	__time_t	msg_ctime;	/* last change time */
	long		__pad3;
	long		__pad4 [4];
};

#else	/* if ! _SYSV4 */

struct msqid_ds {
	struct ipc_perm	msg_perm;	/* operation permission struct */
	struct msg    *	msg_first;	/* ptr to first message on q */
	struct msg    *	msg_last;	/* ptr to last message on q */
	unsigned short	msg_cbytes;	/* current # bytes on q */
	unsigned short	msg_qnum;	/* # of messages on q */
	unsigned short	msg_qbytes;	/* max # of bytes on q */
	unsigned short	msg_lspid;	/* pid of last msgsnd */
	unsigned short	msg_lrpid;	/* pid of last msgrcv */
	__time_t	msg_stime;	/* last msgsnd time */
	__time_t	msg_rtime;	/* last msgrcv time */
	__time_t	msg_ctime;	/* last change time */
};

#endif	/* ! _SYSV4 */

/*
 * There is one msg structure for each message that may be in the system.
 */

struct msg {
	struct	msg	*msg_next;	/* pointer to next message on q */
	long		msg_type;	/* message type */
	unsigned short	msg_ts;		/* message text size */
	short		msg_spot;	/* message text map address */
};


#if	_SYSV3
/*
 * The following atrocity is actually defined in the headers in some SVR3
 * systems, despite being in apalling taste. Sadly, this was documented in
 * Coherent 4.0, so we allow the above feature-test to make this visible.
 *
 * This will disappear from the next release of Coherent; this structure is
 * not present in iBCS2 or the ABI.
 */

struct msgbuf {
	long		mtype;		/* message type */
	char		mtext [1];	/* message text */
};
#endif


__EXTERN_C_BEGIN__

int		msgctl		__PROTO ((int _msqid, int _cmd, ...));
int		msgget		__PROTO ((__key_t _key, int _msgflag));
int		msgsnd		__PROTO ((int _msqid,
					  __CONST__ __VOID__ * _msgp,
					  __size_t _msgsz, int _msgflag));
int		msgrcv		__PROTO ((int _msqid, __VOID__ * _msgp,
					  __size_t _msgsz, long _msgtyp,
					  int _msgflag));

__EXTERN_C_END__

#endif	/* ! defined (__SYS_MSG_H__) */