271 lines
7.2 KiB
C
Executable File
271 lines
7.2 KiB
C
Executable File
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */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. */
|
|
|
|
#ifndef _SYS_MSG_H
|
|
#define _SYS_MSG_H
|
|
|
|
#pragma ident "@(#)msg.h 1.21 94/05/02 SMI" /* SVr4.0 11.14 */
|
|
|
|
#include <sys/ipc.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/*
|
|
* IPC Message Facility.
|
|
*/
|
|
|
|
/*
|
|
* Implementation Constants.
|
|
*/
|
|
|
|
/*
|
|
* 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 */
|
|
|
|
/*
|
|
* There is one msg queue id data structure for each q in the system.
|
|
*/
|
|
|
|
/*
|
|
* Applications that read /dev/mem must be built like the kernel. A new
|
|
* symbol "_KMEMUSER" is defined for this purpose.
|
|
*/
|
|
|
|
#if defined(_KERNEL) || defined(_KMEMUSER)
|
|
|
|
#include <sys/t_lock.h>
|
|
|
|
/* expanded msqid_ds structure */
|
|
|
|
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 */
|
|
ulong msg_cbytes; /* current # bytes on q */
|
|
ulong msg_qnum; /* # of messages on q */
|
|
ulong 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 msg_pad1; /* reserved for time_t expansion */
|
|
time_t msg_rtime; /* last msgrcv time */
|
|
long msg_pad2; /* time_t expansion */
|
|
time_t msg_ctime; /* last change time */
|
|
long msg_pad3; /* time expansion */
|
|
kcondvar_t msg_cv;
|
|
kcondvar_t msg_qnum_cv;
|
|
long msg_pad4[3]; /* reserve area */
|
|
};
|
|
|
|
/* SVR3 structure */
|
|
|
|
struct o_msqid_ds {
|
|
struct o_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_t msg_cbytes; /* current # bytes on q */
|
|
ushort_t msg_qnum; /* # of messages on q */
|
|
ushort_t msg_qbytes; /* max # of bytes on q */
|
|
o_pid_t msg_lspid; /* pid of last msgsnd */
|
|
o_pid_t 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 */
|
|
ushort_t msg_ts; /* message text size */
|
|
short msg_spot; /* message text map address */
|
|
};
|
|
#else /* user definition */
|
|
|
|
/* this maps to the kernel struct msgid_ds */
|
|
|
|
typedef unsigned long msgqnum_t;
|
|
typedef unsigned long msglen_t;
|
|
|
|
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 */
|
|
ulong_t msg_cbytes; /* current # bytes on q */
|
|
msgqnum_t msg_qnum; /* # of messages on q */
|
|
msglen_t 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 msg_pad1; /* reserved for time_t expansion */
|
|
time_t msg_rtime; /* last msgrcv time */
|
|
long msg_pad2; /* time_t expansion */
|
|
time_t msg_ctime; /* last change time */
|
|
long msg_pad3; /* time_t expansion */
|
|
short msg_cv;
|
|
short msg_qnum_cv;
|
|
long msg_pad4[3]; /* reserve area */
|
|
};
|
|
|
|
/*
|
|
* There is one msg structure for each message that may be in the system.
|
|
* XXX - a user version of this should not be necessary, but is being kept
|
|
* XXX - for compatibility.
|
|
*/
|
|
|
|
struct msg {
|
|
struct msg *msg_next; /* ptr to next message on q */
|
|
long msg_type; /* message type */
|
|
ushort_t msg_ts; /* message text size */
|
|
short msg_spot; /* message text map address */
|
|
};
|
|
#endif /* defined(_KERNEL) */
|
|
|
|
/*
|
|
* User message buffer template for msgsnd and msgrecv system calls.
|
|
*/
|
|
|
|
#ifdef _KERNEL
|
|
struct ipcmsgbuf {
|
|
#else
|
|
struct msgbuf {
|
|
#endif /* _KERNEL */
|
|
#if defined(_XOPEN_SOURCE)
|
|
long _mtype; /* message type */
|
|
char _mtext[1]; /* message text */
|
|
#else
|
|
long mtype; /* message type */
|
|
char mtext[1]; /* message text */
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* Message information structure.
|
|
*/
|
|
|
|
struct msginfo {
|
|
int msgmap; /* # of entries in msg map */
|
|
int msgmax; /* max message size */
|
|
int msgmnb; /* max # bytes on queue */
|
|
int msgmni; /* # of message queue identifiers */
|
|
int msgssz; /* msg segment size (should be word size */
|
|
/* multiple) */
|
|
int msgtql; /* # of system message headers */
|
|
ushort_t 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]
|
|
|
|
#if !defined(_KERNEL)
|
|
#if defined(__STDC__)
|
|
int msgctl(int, int, struct msqid_ds *);
|
|
int msgget(key_t, int);
|
|
int msgrcv(int, void *, size_t, long, int);
|
|
int msgsnd(int, const void *, size_t, int);
|
|
#else /* __STDC __ */
|
|
int msgctl();
|
|
int msgget();
|
|
int msgrcv();
|
|
int msgsnd();
|
|
#endif /* __STDC __ */
|
|
#endif /* ! _KERNEL */
|
|
|
|
#ifdef _KERNEL
|
|
|
|
/*
|
|
* Configuration Parameters
|
|
* These parameters are tuned by editing the system configuration file.
|
|
* The following lines establish the default values.
|
|
*/
|
|
#ifndef MSGPOOL
|
|
#define MSGPOOL 8 /* size, in kilobytes, of message pool */
|
|
#endif
|
|
#ifndef MSGMNB
|
|
#define MSGMNB 2048 /* default max number of bytes on a queue */
|
|
#endif
|
|
#ifndef MSGMNI
|
|
#define MSGMNI 50 /* number of message queue identifiers */
|
|
#endif
|
|
#ifndef MSGTQL
|
|
#define MSGTQL 50 /* # of system message headers */
|
|
#endif
|
|
|
|
/* The following parameters are assumed not to require tuning */
|
|
#ifndef MSGMAP
|
|
#define MSGMAP 100 /* number of entries in msg map */
|
|
#endif
|
|
#ifndef MSGMAX
|
|
#define MSGMAX (MSGPOOL * 1024) /* max message size (in bytes) */
|
|
#endif
|
|
#ifndef MSGSSZ
|
|
#define MSGSSZ 8 /* msg segment size (should be word size multiple) */
|
|
#endif
|
|
#define MSGSEG ((MSGPOOL * 1024) / MSGSSZ) /* # segments (MUST BE < 32768) */
|
|
|
|
#ifdef sun
|
|
|
|
struct msglock {
|
|
char msglock_lock;
|
|
kcondvar_t msglock_cv;
|
|
};
|
|
|
|
/*
|
|
* Defined in space.c, allocated/initialized in msg.c
|
|
*/
|
|
extern caddr_t msg; /* base address of message buffer */
|
|
extern struct map *msgmap; /* msg allocation map */
|
|
extern struct msg *msgh; /* message headers */
|
|
extern struct msqid_ds *msgque; /* msg queue headers */
|
|
extern struct msglock *msglock; /* locks for the message queues */
|
|
extern struct msg *msgfp; /* ptr to head of free header list */
|
|
extern struct msginfo msginfo; /* message parameters */
|
|
|
|
#endif /* sun */
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _SYS_MSG_H */
|