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Annotation of cci/sys/h/msg.h, revision 1.1.1.1

1.1       root        1: 
                      2: /* @(#)msg.h   6.1 */
                      3: /*
                      4: **     IPC Message Facility.
                      5: */
                      6: 
                      7: /*
                      8: **     Implementation Constants.
                      9: */
                     10: 
                     11: #define        PMSG    (PZERO + 2)     /* message facility sleep priority */
                     12: 
                     13: /*
                     14: **     Permission Definitions.
                     15: */
                     16: 
                     17: #define        MSG_R   0400    /* read permission */
                     18: #define        MSG_W   0200    /* write permission */
                     19: 
                     20: /*
                     21: **     ipc_perm Mode Definitions.
                     22: */
                     23: 
                     24: #define        MSG_RWAIT       01000   /* a reader is waiting for a message */
                     25: #define        MSG_WWAIT       02000   /* a writer is waiting to send */
                     26: 
                     27: /*
                     28: **     Message Operation Flags.
                     29: */
                     30: 
                     31: #define        MSG_NOERROR     010000  /* no error if big message */
                     32: 
                     33: /*
                     34:  * Defines for Message Limits
                     35:  */
                     36: 
                     37: #define MSGMAP 100             /* # of entries in msg map */
                     38: #define MSGMAX 8192            /* max message size */
                     39: #define MSGMNB 16384           /* max # bytes on queue */
                     40: #define MSGMNI 50              /* # of message queue identifiers */
                     41: #define MSGSSZ 8               /* msg segment size (word size multiple) */
                     42: #define MSGTQL 40              /* # of system message headers */
                     43: #define MSGSEG 1024            /* # of msg segments (MUST BE < 32768) */
                     44: 
                     45: #define MSGMAPPTE      clrnd(btoc(MSGSEG*MSGSSZ))
                     46:                                /* # of pages for message buffer */
                     47: 
                     48: /*
                     49: **     Structure Definitions.
                     50: */
                     51: 
                     52: /*
                     53: **     There is one msg queue id data structure for each q in the system.
                     54: */
                     55: 
                     56: struct msqid_ds {
                     57:        struct ipc_perm msg_perm;       /* operation permission struct */
                     58:        struct msg      *msg_first;     /* ptr to first message on q */
                     59:        struct msg      *msg_last;      /* ptr to last message on q */
                     60:        ushort          msg_cbytes;     /* current # bytes on q */
                     61:        ushort          msg_qnum;       /* # of messages on q */
                     62:        ushort          msg_qbytes;     /* max # of bytes on q */
                     63:        ushort          msg_lspid;      /* pid of last msgsnd */
                     64:        ushort          msg_lrpid;      /* pid of last msgrcv */
                     65:        time_t          msg_stime;      /* last msgsnd time */
                     66:        time_t          msg_rtime;      /* last msgrcv time */
                     67:        time_t          msg_ctime;      /* last change time */
                     68: };
                     69: 
                     70: /*
                     71: **     There is one msg structure for each message that may be in the system.
                     72: */
                     73: 
                     74: struct msg {
                     75:        struct msg      *msg_next;      /* ptr to next message on q */
                     76:        long            msg_type;       /* message type */
                     77:        short           msg_ts;         /* message text size */
                     78:        short           msg_spot;       /* message text map address */
                     79: };
                     80: 
                     81: /*
                     82: **     User message buffer template for msgsnd and msgrecv system calls.
                     83: */
                     84: 
                     85: struct msgbuff {
                     86:        long    mtype;          /* message type */
                     87:        char    mtext[1];       /* message text */
                     88: };
                     89: 
                     90: /*
                     91: **     Message information structure.
                     92: */
                     93: 
                     94: struct msginfo {
                     95:        int     msgmap, /* # of entries in msg map */
                     96:                msgmax, /* max message size */
                     97:                msgmnb, /* max # bytes on queue */
                     98:                msgmni, /* # of message queue identifiers */
                     99:                msgssz, /* msg segment size (should be word size multiple) */
                    100:                msgtql; /* # of system message headers */
                    101:        ushort  msgseg; /* # of msg segments (MUST BE < 32768) */
                    102: };
                    103:  
                    104: 
                    105: #ifdef KERNEL
                    106: extern struct pte      Msgmap[];
                    107: extern char            msgutl[];
                    108: #endif

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