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Annotation of researchv10dc/630/include/message.h, revision 1.1.1.1

1.1       root        1: /*       Copyright (c) 1987 AT&T   */
                      2: /*       All Rights Reserved       */
                      3: 
                      4: /*       THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T   */
                      5: /*       The copyright notice above does not evidence any      */
                      6: /*       actual or intended publication of such source code.   */
                      7: 
                      8: #include <sccsid.h>
                      9: HVERSION(message, @(#)message.h        1.1.1.2 (5/12/87));
                     10: 
                     11: 
                     12: /* message queue defines */
                     13: #define        IPC_CREAT       0001000
                     14: #define IPC_EXCL       0002000
                     15: #define        IPC_NOWAIT      0004000
                     16: #define IPC_RMID       0
                     17: #define        IPC_SET         1
                     18: #define IPC_STAT       2
                     19: #define IPC_PRIVATE    (long)0
                     20: #define MSG_NOERROR    010000
                     21: #define MAX_QBYTES     0020000
                     22: #define NO_SAVE                0000010
                     23: #define NO_COPY                0000020
                     24: 
                     25: 
                     26: 
                     27: typedef struct msgbuf { /* a message */
                     28:        long    mtype;          /* message identifier */
                     29:        char    mtext[1];       /* text of the message */
                     30: } msgbuf;
                     31: 
                     32: typedef struct message_list { /* make a linked list of messages */
                     33:        msgbuf  *msg;                   /* the message */
                     34:        int     size;                   /* size of the message */
                     35:        struct message_list *next;      /* link to the next message */
                     36: } message_list;
                     37: 
                     38: 
                     39: typedef struct msqid_ds { /* a message queue */
                     40:        struct Proc *cid;       /* process that created the queue */
                     41:        short   msg_qnum;       /* number of messages in the queue */
                     42:        short   msg_qbytes;     /* number of bytes used by the queue */
                     43:        struct Proc *msg_lspid; /* process id of the last process to send to the queue */
                     44:        struct Proc *msg_lrpid; /* process id of the last process to rcv from the queue */
                     45:        unsigned long msg_stime;/* time of last send to the queue */
                     46:        unsigned long msg_rtime;/* time of the last rcv from the queue */
                     47:        unsigned long msg_ctime;/* time of the last change to this structure */
                     48:        message_list *msg_list; /* linked list of messages in the queue */
                     49:        short   msg_curbytes;   /* current number of bytes used by the queue */
                     50:        short   state;          /* used to decide if to delete when the process dies */ 
                     51:        long    name;           /* the name of the queue (key) */
                     52:        struct msqid_ds *next;  /* link to the next queue */
                     53: } msqid_ds;
                     54: 
                     55: 
                     56: long     msgget();               /* (key,msgflg) get a message from a queue */
                     57: void    init_msq();             /* (mp,name,msgflg) initialize a message queue */
                     58: int     msgctl();               /* (msqid,cmd,buf) stat, set, or remove a queue */
                     59: int     valid_msqid();          /* (msqid) is the given msqid valid? */
                     60: void    free_msq();             /* (msqid)free the memory used by a message queue */
                     61: int     msgsnd();               /* (msqid,msgp,msgsz,msgflg) send a message */
                     62: int     msgrcv();               /* (msqid,msgp,msgsz,msgtyp,msgflg) receive a message */
                     63: message_list *rcv_message();    /* (msqid,msgtyp) get the first message of the given type */
                     64: 
                     65: 

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