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Length: 2896 (0xb50)
Types: TextFile
Notes: UNIX file
Names: »msg.h«
└─⟦a6ab2eb36⟧ Bits:30004042/kconfig3.imd SW95705I 386/ix Multi-user Release 1.2
└─⟦a6ab2eb36⟧ UNIX Filesystem
└─⟦this⟧ »kc/new/usr/include/sys/msg.h«
/* Copyright (c) 1984 AT&T */
/* All Rights Reserved */
/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
/* The copyright notice above does not evidence any */
/* actual or intended publication of such source code. */
#ident "@(#)msg.h 1.3"
/*
** IPC Message Facility.
*/
/*
** Implementation Constants.
*/
#define PMSG (PZERO + 2) /* message facility sleep priority */
/*
** Permission Definitions.
*/
#define MSG_R 0400 /* read permission */
#define MSG_W 0200 /* write permission */
/*
** 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 */
/*
** Structure Definitions.
*/
/*
** There is one msg queue id data structure for each q in the system.
*/
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 */
ushort msg_cbytes; /* current # bytes on q */
ushort msg_qnum; /* # of messages on q */
ushort msg_qbytes; /* max # of bytes on q */
ushort msg_lspid; /* pid of last msgsnd */
ushort 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 */
};
/*
** There is one msg structure for each message that may be in the system.
*/
struct msg {
struct msg *msg_next; /* ptr to next message on q */
long msg_type; /* message type */
short msg_ts; /* message text size */
short msg_spot; /* message text map address */
};
/*
** User message buffer template for msgsnd and msgrecv system calls.
*/
struct msgbuf {
long mtype; /* message type */
char mtext[1]; /* message text */
};
/*
** Message information structure.
*/
struct msginfo {
int msgmap, /* # of entries in msg map */
msgmax, /* max message size */
msgmnb, /* max # bytes on queue */
msgmni, /* # of message queue identifiers */
msgssz, /* msg segment size (should be word size multiple) */
msgtql; /* # of system message headers */
ushort msgseg; /* # of msg segments (MUST BE < 32768) */
};
/* We have to be able to lock a message queue since we can
** sleep during message processing due to a page fault in
** copyin/copyout or iomove. We cannot add anything to the
** msqid_ds structure since this is used in user programs
** and any change would break object file compatibility.
** Therefore, we allocate a parallel array, msglock, which
** is used to lock a message queue. The array is defined
** in the msg master file. The following macro takes a
** pointer to a message queue and returns a pointer to the
** lock entry. The argument must be a pointer to a msgqid
** structure.
**/
#define MSGLOCK(X) &msglock[X - msgque]