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Annotation of 43BSD/sys/h/socketvar.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)socketvar.h 7.1 (Berkeley) 6/4/86
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * Kernel structure per socket.
        !            11:  * Contains send and receive buffer queues,
        !            12:  * handle on protocol and pointer to protocol
        !            13:  * private data and error information.
        !            14:  */
        !            15: struct socket {
        !            16:        short   so_type;                /* generic type, see socket.h */
        !            17:        short   so_options;             /* from socket call, see socket.h */
        !            18:        short   so_linger;              /* time to linger while closing */
        !            19:        short   so_state;               /* internal state flags SS_*, below */
        !            20:        caddr_t so_pcb;                 /* protocol control block */
        !            21:        struct  protosw *so_proto;      /* protocol handle */
        !            22: /*
        !            23:  * Variables for connection queueing.
        !            24:  * Socket where accepts occur is so_head in all subsidiary sockets.
        !            25:  * If so_head is 0, socket is not related to an accept.
        !            26:  * For head socket so_q0 queues partially completed connections,
        !            27:  * while so_q is a queue of connections ready to be accepted.
        !            28:  * If a connection is aborted and it has so_head set, then
        !            29:  * it has to be pulled out of either so_q0 or so_q.
        !            30:  * We allow connections to queue up based on current queue lengths
        !            31:  * and limit on number of queued connections for this socket.
        !            32:  */
        !            33:        struct  socket *so_head;        /* back pointer to accept socket */
        !            34:        struct  socket *so_q0;          /* queue of partial connections */
        !            35:        short   so_q0len;               /* partials on so_q0 */
        !            36:        struct  socket *so_q;           /* queue of incoming connections */
        !            37:        short   so_qlen;                /* number of connections on so_q */
        !            38:        short   so_qlimit;              /* max number queued connections */
        !            39: /*
        !            40:  * Variables for socket buffering.
        !            41:  */
        !            42:        struct  sockbuf {
        !            43:                u_short sb_cc;          /* actual chars in buffer */
        !            44:                u_short sb_hiwat;       /* max actual char count */
        !            45:                u_short sb_mbcnt;       /* chars of mbufs used */
        !            46:                u_short sb_mbmax;       /* max chars of mbufs to use */
        !            47:                u_short sb_lowat;       /* low water mark (not used yet) */
        !            48:                short   sb_timeo;       /* timeout (not used yet) */
        !            49:                struct  mbuf *sb_mb;    /* the mbuf chain */
        !            50:                struct  proc *sb_sel;   /* process selecting read/write */
        !            51:                short   sb_flags;       /* flags, see below */
        !            52:        } so_rcv, so_snd;
        !            53: #define        SB_MAX          65535           /* max chars in sockbuf */
        !            54: #define        SB_LOCK         0x01            /* lock on data queue (so_rcv only) */
        !            55: #define        SB_WANT         0x02            /* someone is waiting to lock */
        !            56: #define        SB_WAIT         0x04            /* someone is waiting for data/space */
        !            57: #define        SB_SEL          0x08            /* buffer is selected */
        !            58: #define        SB_COLL         0x10            /* collision selecting */
        !            59:        short   so_timeo;               /* connection timeout */
        !            60:        u_short so_error;               /* error affecting connection */
        !            61:        u_short so_oobmark;             /* chars to oob mark */
        !            62:        short   so_pgrp;                /* pgrp for signals */
        !            63: };
        !            64: 
        !            65: /*
        !            66:  * Socket state bits.
        !            67:  */
        !            68: #define        SS_NOFDREF              0x001   /* no file table ref any more */
        !            69: #define        SS_ISCONNECTED          0x002   /* socket connected to a peer */
        !            70: #define        SS_ISCONNECTING         0x004   /* in process of connecting to peer */
        !            71: #define        SS_ISDISCONNECTING      0x008   /* in process of disconnecting */
        !            72: #define        SS_CANTSENDMORE         0x010   /* can't send more data to peer */
        !            73: #define        SS_CANTRCVMORE          0x020   /* can't receive more data from peer */
        !            74: #define        SS_RCVATMARK            0x040   /* at mark on input */
        !            75: 
        !            76: #define        SS_PRIV                 0x080   /* privileged for broadcast, raw... */
        !            77: #define        SS_NBIO                 0x100   /* non-blocking ops */
        !            78: #define        SS_ASYNC                0x200   /* async i/o notify */
        !            79: 
        !            80: 
        !            81: /*
        !            82:  * Macros for sockets and socket buffering.
        !            83:  */
        !            84: 
        !            85: /* how much space is there in a socket buffer (so->so_snd or so->so_rcv) */
        !            86: #define        sbspace(sb) \
        !            87:     (MIN((int)((sb)->sb_hiwat - (sb)->sb_cc),\
        !            88:         (int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
        !            89: 
        !            90: /* do we have to send all at once on a socket? */
        !            91: #define        sosendallatonce(so) \
        !            92:     ((so)->so_proto->pr_flags & PR_ATOMIC)
        !            93: 
        !            94: /* can we read something from so? */
        !            95: #define        soreadable(so) \
        !            96:     ((so)->so_rcv.sb_cc || ((so)->so_state & SS_CANTRCVMORE) || \
        !            97:        (so)->so_qlen || (so)->so_error)
        !            98: 
        !            99: /* can we write something to so? */
        !           100: #define        sowriteable(so) \
        !           101:     (sbspace(&(so)->so_snd) > 0 && \
        !           102:        (((so)->so_state&SS_ISCONNECTED) || \
        !           103:          ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0) || \
        !           104:      ((so)->so_state & SS_CANTSENDMORE) || \
        !           105:      (so)->so_error)
        !           106: 
        !           107: /* adjust counters in sb reflecting allocation of m */
        !           108: #define        sballoc(sb, m) { \
        !           109:        (sb)->sb_cc += (m)->m_len; \
        !           110:        (sb)->sb_mbcnt += MSIZE; \
        !           111:        if ((m)->m_off > MMAXOFF) \
        !           112:                (sb)->sb_mbcnt += CLBYTES; \
        !           113: }
        !           114: 
        !           115: /* adjust counters in sb reflecting freeing of m */
        !           116: #define        sbfree(sb, m) { \
        !           117:        (sb)->sb_cc -= (m)->m_len; \
        !           118:        (sb)->sb_mbcnt -= MSIZE; \
        !           119:        if ((m)->m_off > MMAXOFF) \
        !           120:                (sb)->sb_mbcnt -= CLBYTES; \
        !           121: }
        !           122: 
        !           123: /* set lock on sockbuf sb */
        !           124: #define sblock(sb) { \
        !           125:        while ((sb)->sb_flags & SB_LOCK) { \
        !           126:                (sb)->sb_flags |= SB_WANT; \
        !           127:                sleep((caddr_t)&(sb)->sb_flags, PZERO+1); \
        !           128:        } \
        !           129:        (sb)->sb_flags |= SB_LOCK; \
        !           130: }
        !           131: 
        !           132: /* release lock on sockbuf sb */
        !           133: #define        sbunlock(sb) { \
        !           134:        (sb)->sb_flags &= ~SB_LOCK; \
        !           135:        if ((sb)->sb_flags & SB_WANT) { \
        !           136:                (sb)->sb_flags &= ~SB_WANT; \
        !           137:                wakeup((caddr_t)&(sb)->sb_flags); \
        !           138:        } \
        !           139: }
        !           140: 
        !           141: #define        sorwakeup(so)   sowakeup((so), &(so)->so_rcv)
        !           142: #define        sowwakeup(so)   sowakeup((so), &(so)->so_snd)
        !           143: 
        !           144: #ifdef KERNEL
        !           145: struct socket *sonewconn();
        !           146: #endif

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