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- /* -*-C-*-
- *
- * $Header: /ax/networking:include/sys/socketvar.h:networking 1.1 $
- * $Source: /ax/networking:include/sys/socketvar.h: $
- *
- * Copyright (c) 1995 Acorn Computers Ltd., Cambridge, England
- *
- * $Log: socketvar.h,v $
- * Revision 1.1 95/01/11 10:19:48 kwelton
- * Initial revision
- *
- * Revision 1.1 95/01/11 10:19:48 kwelton
- * Initial revision
- *
- */
-
- /*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that this notice is preserved and that due credit is given
- * to the University of California at Berkeley. The name of the University
- * may not be used to endorse or promote products derived from this
- * software without specific prior written permission. This software
- * is provided ``as is'' without express or implied warranty.
- *
- * @(#)socketvar.h 7.3 (Berkeley) 12/30/87
- */
-
- /*
- * Kernel structure per socket.
- * Contains send and receive buffer queues,
- * handle on protocol and pointer to protocol
- * private data and error information.
- */
- struct socket {
- short so_type; /* generic type, see socket.h */
- short so_options; /* from socket call, see socket.h */
- short so_linger; /* time to linger while closing */
- short so_state; /* internal state flags SS_*, below */
- caddr_t so_pcb; /* protocol control block */
- struct protosw *so_proto; /* protocol handle */
- /*
- * Variables for connection queueing.
- * Socket where accepts occur is so_head in all subsidiary sockets.
- * If so_head is 0, socket is not related to an accept.
- * For head socket so_q0 queues partially completed connections,
- * while so_q is a queue of connections ready to be accepted.
- * If a connection is aborted and it has so_head set, then
- * it has to be pulled out of either so_q0 or so_q.
- * We allow connections to queue up based on current queue lengths
- * and limit on number of queued connections for this socket.
- */
- struct socket *so_head; /* back pointer to accept socket */
- struct socket *so_q0; /* queue of partial connections */
- struct socket *so_q; /* queue of incoming connections */
- short so_q0len; /* partials on so_q0 */
- short so_qlen; /* number of connections on so_q */
- short so_qlimit; /* max number queued connections */
- short so_timeo; /* connection timeout */
- u_short so_error; /* error affecting connection */
- short so_pgrp; /* pgrp for signals */
- u_long so_oobmark; /* chars to oob mark */
- /*
- * Variables for socket buffering.
- */
- struct sockbuf {
- u_long sb_cc; /* actual chars in buffer */
- u_long sb_hiwat; /* max actual char count */
- u_long sb_mbcnt; /* chars of mbufs used */
- u_long sb_mbmax; /* max chars of mbufs to use */
- u_long sb_lowat; /* low water mark (not used yet) */
- struct mbuf *sb_mb; /* the mbuf chain */
- struct proc *sb_sel; /* process selecting read/write */
- short sb_timeo; /* timeout (not used yet) */
- short sb_flags; /* flags, see below */
- } so_rcv, so_snd;
- #define SB_MAX (64*1024) /* max chars in sockbuf */
- #define SB_LOCK 0x01 /* lock on data queue (so_rcv only) */
- #define SB_WANT 0x02 /* someone is waiting to lock */
- #define SB_WAIT 0x04 /* someone is waiting for data/space */
- #define SB_SEL 0x08 /* buffer is selected */
- #define SB_COLL 0x10 /* collision selecting */
- };
-
- /*
- * Socket state bits.
- */
- #define SS_NOFDREF 0x001 /* no file table ref any more */
- #define SS_ISCONNECTED 0x002 /* socket connected to a peer */
- #define SS_ISCONNECTING 0x004 /* in process of connecting to peer */
- #define SS_ISDISCONNECTING 0x008 /* in process of disconnecting */
- #define SS_CANTSENDMORE 0x010 /* can't send more data to peer */
- #define SS_CANTRCVMORE 0x020 /* can't receive more data from peer */
- #define SS_RCVATMARK 0x040 /* at mark on input */
-
- #define SS_PRIV 0x080 /* privileged for broadcast, raw... */
- #define SS_NBIO 0x100 /* non-blocking ops */
- #define SS_ASYNC 0x200 /* async i/o notify */
- #define SS_RXDIRECT 0x400 /* notify user directly of rx input */
-
- /*
- * Macros for sockets and socket buffering.
- */
-
- /* how much space is there in a socket buffer (so->so_snd or so->so_rcv) */
- #define sbspace(sb) \
- (MIN((long)((sb)->sb_hiwat - (sb)->sb_cc),\
- (long)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
-
- /* do we have to send all at once on a socket? */
- #define sosendallatonce(so) \
- ((so)->so_proto->pr_flags & PR_ATOMIC)
-
- /* can we read something from so? */
- #define soreadable(so) \
- ((so)->so_rcv.sb_cc || ((so)->so_state & SS_CANTRCVMORE) || \
- (so)->so_qlen || (so)->so_error)
-
- /* can we write something to so? */
- #define sowriteable(so) \
- (sbspace(&(so)->so_snd) > 0 && \
- (((so)->so_state&SS_ISCONNECTED) || \
- ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0) || \
- ((so)->so_state & SS_CANTSENDMORE) || \
- (so)->so_error)
-
- /* adjust counters in sb reflecting allocation of m */
- #define sballoc(sb, m) { \
- (sb)->sb_cc += (m)->m_len; \
- (sb)->sb_mbcnt += (m)->m_inilen; \
- }
-
- /* adjust counters in sb reflecting freeing of m */
- #define sbfree(sb, m) { \
- (sb)->sb_cc -= (m)->m_len; \
- (sb)->sb_mbcnt -= (m)->m_inilen; \
- }
-
- #if defined(__riscos) && defined(OldCode)
- /*
- * riscos does not need sblock and sbunlock: any call to sblock
- * with a lock already active will deadlock the system.
- */
- #define sblock(sb) ;
- #define sbunlock(sb) ;
-
- #else
-
- /* set lock on sockbuf sb */
- #define sblock(sb) { \
- while ((sb)->sb_flags & SB_LOCK) { \
- (sb)->sb_flags |= SB_WANT; \
- sleep((caddr_t)&(sb)->sb_flags, PZERO+1); \
- } \
- (sb)->sb_flags |= SB_LOCK; \
- }
-
- /* release lock on sockbuf sb */
- #define sbunlock(sb) { \
- (sb)->sb_flags &= ~SB_LOCK; \
- if ((sb)->sb_flags & SB_WANT) { \
- (sb)->sb_flags &= ~SB_WANT; \
- wakeup((caddr_t)&(sb)->sb_flags); \
- } \
- }
-
- #endif
-
- #define sorwakeup(so) sowakeup((so), &(so)->so_rcv)
- #define sowwakeup(so) sowakeup((so), &(so)->so_snd)
-
- #ifdef KERNEL
- struct socket *sonewconn();
- #endif
-
- /* EOF socketvar.h */
-