author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 01 Apr 2010 00:15:09 +0300 | |
branch | RCL_3 |
changeset 15 | 18da5738c9b6 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/* $FreeBSD: src/sys/sys/msg.h,v 1.20 2005/01/07 02:29:23 imp Exp $ */ |
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/* $NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $ */ |
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/*- |
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* SVID compatible msg.h file |
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* |
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* Author: Daniel Boulet |
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* |
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*© Portions copyright (c) 2006 Nokia Corporation. All rights reserved. |
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* Copyright 1993 Daniel Boulet and RTMX Inc. |
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* |
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* This system call was implemented by Daniel Boulet under contract from RTMX. |
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* |
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* Redistribution and use in source forms, with and without modification, |
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* are permitted provided that this entire comment appears intact. |
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* |
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* Redistribution in binary form may occur without any restrictions. |
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* Obviously, it would be nice if you gave credit where credit is due |
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* but requiring it would be too onerous. |
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* |
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* This software is provided ``AS IS'' without any warranties of any kind. |
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*/ |
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#ifndef _SYS_MSG_H_ |
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#define _SYS_MSG_H_ |
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#include <sys/cdefs.h> |
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#include <sys/_types.h> |
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#include <sys/ipc.h> |
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/* |
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* The MSG_NOERROR identifier value, the msqid_ds struct and the msg struct |
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* are as defined by the SV API Intel 386 Processor Supplement. |
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*/ |
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#define MSG_NOERROR 010000 /* don't complain about too long msgs */ |
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typedef unsigned long msglen_t; |
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typedef unsigned long msgqnum_t; |
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#ifndef _PID_T_DECLARED |
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typedef __pid_t pid_t; |
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#define _PID_T_DECLARED |
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#endif |
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#ifndef _SIZE_T_DECLARED |
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typedef __size_t size_t; |
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#define _SIZE_T_DECLARED |
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#endif |
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#ifndef _SSIZE_T_DECLARED |
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typedef __ssize_t ssize_t; |
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#define _SSIZE_T_DECLARED |
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#endif |
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#ifndef _TIME_T_DECLARED |
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typedef __time_t time_t; |
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#define _TIME_T_DECLARED |
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#endif |
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/* |
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* XXX there seems to be no prefix reserved for this header, so the name |
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* "msg" in "struct msg" and the names of all of the nonstandard members |
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* (mainly "msg_pad*) are namespace pollution. |
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*/ |
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struct msqid_ds { |
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struct ipc_perm msg_perm; /* msg queue permission bits */ |
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struct msg *msg_first; /* first message in the queue */ |
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struct msg *msg_last; /* last message in the queue */ |
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msglen_t msg_cbytes; /* number of bytes in use on the queue */ |
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msgqnum_t msg_qnum; /* number of msgs in the queue */ |
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msglen_t msg_qbytes; /* max # of bytes on the queue */ |
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pid_t msg_lspid; /* pid of last msgsnd() */ |
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pid_t msg_lrpid; /* pid of last msgrcv() */ |
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time_t msg_stime; /* time of last msgsnd() */ |
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long msg_pad1; |
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time_t msg_rtime; /* time of last msgrcv() */ |
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long msg_pad2; |
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time_t msg_ctime; /* time of last msgctl() */ |
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long msg_pad3; |
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long msg_pad4[4]; |
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}; |
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#if __BSD_VISIBLE |
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/* |
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* Structure describing a message. The SVID doesn't suggest any |
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* particular name for this structure. There is a reference in the |
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* msgop man page that reads "The structure mymsg is an example of what |
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* this user defined buffer might look like, and includes the following |
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* members:". This sentence is followed by two lines equivalent |
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* to the mtype and mtext field declarations below. It isn't clear |
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* if "mymsg" refers to the name of the structure type or the name of an |
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* instance of the structure... |
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*/ |
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struct mymsg { |
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long mtype; /* message type (+ve integer) */ |
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char mtext[1]; /* message body */ |
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}; |
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#endif |
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#ifdef _KERNEL |
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struct msg { |
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struct msg *msg_next; /* next msg in the chain */ |
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long msg_type; /* type of this message */ |
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/* >0 -> type of this message */ |
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/* 0 -> free header */ |
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u_short msg_ts; /* size of this message */ |
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short msg_spot; /* location of start of msg in buffer */ |
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struct label *label; /* MAC Framework label */ |
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}; |
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/* |
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* Based on the configuration parameters described in an SVR2 (yes, two) |
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* config(1m) man page. |
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* |
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* Each message is broken up and stored in segments that are msgssz bytes |
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* long. For efficiency reasons, this should be a power of two. Also, |
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* it doesn't make sense if it is less than 8 or greater than about 256. |
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* Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of |
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* two between 8 and 1024 inclusive (and panic's if it isn't). |
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*/ |
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struct msginfo { |
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int msgmax, /* max chars in a message */ |
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msgmni, /* max message queue identifiers */ |
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msgmnb, /* max chars in a queue */ |
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msgtql, /* max messages in system */ |
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msgssz, /* size of a message segment (see notes above) */ |
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msgseg; /* number of message segments */ |
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}; |
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extern struct msginfo msginfo; |
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|
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/* |
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* Kernel wrapper for the user-level structure. |
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*/ |
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struct msqid_kernel { |
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/* |
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* Data structure exposed to user space. |
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*/ |
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struct msqid_ds u; |
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/* |
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* Kernel-private components of the message queue. |
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*/ |
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struct label *label; /* MAC label */ |
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}; |
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#else /* !_KERNEL */ |
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/* Template for struct to be used as argument for `msgsnd' and `msgrcv'. */ |
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struct msgbuf |
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{ |
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long int mtype; /* type of received/sent message */ |
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char mtext[1]; /* text of the message */ |
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}; |
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// FUNCTION PROTOTYPES |
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// FORWARD DECLARATIONS |
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// CLASS/STRUCT/FUNCTION DECLARATION |
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__BEGIN_DECLS |
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/* |
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* Get the message queue identifier using the IPC key generated by ftok. |
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*/ |
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IMPORT_C int msgget(key_t key, int msgflg); |
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/* |
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* Used to send a message to the queue associated with the message identifier specified by msqid. |
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*/ |
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IMPORT_C int msgsnd(int msqid, const void *msgp, size_t msgsz, int msgflg); |
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/* |
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* Reads a message from the queue associated with the message queue identifier. |
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*/ |
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IMPORT_C ssize_t msgrcv(int msqid, void* msgp, size_t msgsz, long msgtyp, int msgflg); |
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/* |
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* Provides an interface to control message queue and control operations as specified by cmd. |
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*/ |
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IMPORT_C int msgctl(int msqid, int cmd, struct msqid_ds* buf); |
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__END_DECLS |
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#endif /* !_KERNEL */ |
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#endif // _SYS_MSG_H_ |
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// End of File |