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Annotation of 42BSD/sys/h/socketvar.h, revision 1.1

1.1     ! root        1: /*     socketvar.h     6.1     83/07/29        */
        !             2: 
        !             3: /*
        !             4:  * Kernel structure per socket.
        !             5:  * Contains send and receive buffer queues,
        !             6:  * handle on protocol and pointer to protocol
        !             7:  * private data and error information.
        !             8:  */
        !             9: struct socket {
        !            10:        short   so_type;                /* generic type, see socket.h */
        !            11:        short   so_options;             /* from socket call, see socket.h */
        !            12:        short   so_linger;              /* time to linger while closing */
        !            13:        short   so_state;               /* internal state flags SS_*, below */
        !            14:        caddr_t so_pcb;                 /* protocol control block */
        !            15:        struct  protosw *so_proto;      /* protocol handle */
        !            16: /*
        !            17:  * Variables for connection queueing.
        !            18:  * Socket where accepts occur is so_head in all subsidiary sockets.
        !            19:  * If so_head is 0, socket is not related to an accept.
        !            20:  * For head socket so_q0 queues partially completed connections,
        !            21:  * while so_q is a queue of connections ready to be accepted.
        !            22:  * If a connection is aborted and it has so_head set, then
        !            23:  * it has to be pulled out of either so_q0 or so_q.
        !            24:  * We allow connections to queue up based on current queue lengths
        !            25:  * and limit on number of queued connections for this socket.
        !            26:  */
        !            27:        struct  socket *so_head;        /* back pointer to accept socket */
        !            28:        struct  socket *so_q0;          /* queue of partial connections */
        !            29:        short   so_q0len;               /* partials on so_q0 */
        !            30:        struct  socket *so_q;           /* queue of incoming connections */
        !            31:        short   so_qlen;                /* number of connections on so_q */
        !            32:        short   so_qlimit;              /* max number queued connections */
        !            33: /*
        !            34:  * Variables for socket buffering.
        !            35:  */
        !            36:        struct  sockbuf {
        !            37:                short   sb_cc;          /* actual chars in buffer */
        !            38:                short   sb_hiwat;       /* max actual char count */
        !            39:                short   sb_mbcnt;       /* chars of mbufs used */
        !            40:                short   sb_mbmax;       /* max chars of mbufs to use */
        !            41:                short   sb_lowat;       /* low water mark (not used yet) */
        !            42:                short   sb_timeo;       /* timeout (not used yet) */
        !            43:                struct  mbuf *sb_mb;    /* the mbuf chain */
        !            44:                struct  proc *sb_sel;   /* process selecting read/write */
        !            45:                short   sb_flags;       /* flags, see below */
        !            46:        } so_rcv, so_snd;
        !            47: #define        SB_LOCK         0x01            /* lock on data queue (so_rcv only) */
        !            48: #define        SB_WANT         0x02            /* someone is waiting to lock */
        !            49: #define        SB_WAIT         0x04            /* someone is waiting for data/space */
        !            50: #define        SB_SEL          0x08            /* buffer is selected */
        !            51: #define        SB_COLL         0x10            /* collision selecting */
        !            52:        short   so_timeo;               /* connection timeout */
        !            53:        u_short so_error;               /* error affecting connection */
        !            54:        short   so_oobmark;             /* chars to oob mark */
        !            55:        short   so_pgrp;                /* pgrp for signals */
        !            56: };
        !            57: 
        !            58: /*
        !            59:  * Socket state bits.
        !            60:  */
        !            61: #define        SS_NOFDREF              0x001   /* no file table ref any more */
        !            62: #define        SS_ISCONNECTED          0x002   /* socket connected to a peer */
        !            63: #define        SS_ISCONNECTING         0x004   /* in process of connecting to peer */
        !            64: #define        SS_ISDISCONNECTING      0x008   /* in process of disconnecting */
        !            65: #define        SS_CANTSENDMORE         0x010   /* can't send more data to peer */
        !            66: #define        SS_CANTRCVMORE          0x020   /* can't receive more data from peer */
        !            67: #define        SS_RCVATMARK            0x040   /* at mark on input */
        !            68: 
        !            69: #define        SS_PRIV                 0x080   /* privileged for broadcast, raw... */
        !            70: #define        SS_NBIO                 0x100   /* non-blocking ops */
        !            71: #define        SS_ASYNC                0x200   /* async i/o notify */
        !            72: 
        !            73: 
        !            74: /*
        !            75:  * Macros for sockets and socket buffering.
        !            76:  */
        !            77: 
        !            78: /* how much space is there in a socket buffer (so->so_snd or so->so_rcv) */
        !            79: #define        sbspace(sb) \
        !            80:     (MIN((sb)->sb_hiwat-(sb)->sb_cc, ((sb)->sb_mbmax-(sb)->sb_mbcnt)))
        !            81: 
        !            82: /* do we have to send all at once on a socket? */
        !            83: #define        sosendallatonce(so) \
        !            84:     (((so)->so_state & SS_NBIO) || ((so)->so_proto->pr_flags & PR_ATOMIC))
        !            85: 
        !            86: /* can we read something from so? */
        !            87: #define        soreadable(so) \
        !            88:     ((so)->so_rcv.sb_cc || ((so)->so_state & SS_CANTRCVMORE) || (so)->so_qlen)
        !            89: 
        !            90: /* can we write something to so? */
        !            91: #define        sowriteable(so) \
        !            92:     (sbspace(&(so)->so_snd) > 0 && \
        !            93:        (((so)->so_state&SS_ISCONNECTED) || \
        !            94:          ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0) || \
        !            95:      ((so)->so_state & SS_CANTSENDMORE))
        !            96: 
        !            97: /* adjust counters in sb reflecting allocation of m */
        !            98: #define        sballoc(sb, m) { \
        !            99:        (sb)->sb_cc += (m)->m_len; \
        !           100:        (sb)->sb_mbcnt += MSIZE; \
        !           101:        if ((m)->m_off > MMAXOFF) \
        !           102:                (sb)->sb_mbcnt += CLBYTES; \
        !           103: }
        !           104: 
        !           105: /* adjust counters in sb reflecting freeing of m */
        !           106: #define        sbfree(sb, m) { \
        !           107:        (sb)->sb_cc -= (m)->m_len; \
        !           108:        (sb)->sb_mbcnt -= MSIZE; \
        !           109:        if ((m)->m_off > MMAXOFF) \
        !           110:                (sb)->sb_mbcnt -= CLBYTES; \
        !           111: }
        !           112: 
        !           113: /* set lock on sockbuf sb */
        !           114: #define sblock(sb) { \
        !           115:        while ((sb)->sb_flags & SB_LOCK) { \
        !           116:                (sb)->sb_flags |= SB_WANT; \
        !           117:                sleep((caddr_t)&(sb)->sb_flags, PZERO+1); \
        !           118:        } \
        !           119:        (sb)->sb_flags |= SB_LOCK; \
        !           120: }
        !           121: 
        !           122: /* release lock on sockbuf sb */
        !           123: #define        sbunlock(sb) { \
        !           124:        (sb)->sb_flags &= ~SB_LOCK; \
        !           125:        if ((sb)->sb_flags & SB_WANT) { \
        !           126:                (sb)->sb_flags &= ~SB_WANT; \
        !           127:                wakeup((caddr_t)&(sb)->sb_flags); \
        !           128:        } \
        !           129: }
        !           130: 
        !           131: #define        sorwakeup(so)   sbwakeup(&(so)->so_rcv)
        !           132: #define        sowwakeup(so)   sbwakeup(&(so)->so_snd)
        !           133: 
        !           134: #ifdef KERNEL
        !           135: struct socket *sonewconn();
        !           136: #endif

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