175 lines
5.8 KiB
C
Executable File
175 lines
5.8 KiB
C
Executable File
/* @(#)socketvar.h 2.17 89/05/08 SMI; from UCB 7.3 12/30/87 */
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/*
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* Copyright (c) 1982, 1986 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*/
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#ifndef _sys_socketvar_h
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#define _sys_socketvar_h
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/*
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* Kernel structure per socket.
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* Contains send and receive buffer queues,
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* handle on protocol and pointer to protocol
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* private data and error information.
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*/
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struct socket {
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short so_type; /* generic type, see socket.h */
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short so_options; /* from socket call, see socket.h */
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short so_linger; /* time to linger while closing */
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short so_state; /* internal state flags SS_*, below */
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caddr_t so_pcb; /* protocol control block */
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struct protosw *so_proto; /* protocol handle */
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/*
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* Variables for connection queueing.
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* Socket where accepts occur is so_head in all subsidiary sockets.
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* If so_head is 0, socket is not related to an accept.
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* For head socket so_q0 queues partially completed connections,
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* while so_q is a queue of connections ready to be accepted.
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* If a connection is aborted and it has so_head set, then
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* it has to be pulled out of either so_q0 or so_q.
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* We allow connections to queue up based on current queue lengths
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* and limit on number of queued connections for this socket.
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*/
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struct socket *so_head; /* back pointer to accept socket */
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struct socket *so_q0; /* queue of partial connections */
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struct socket *so_q; /* queue of incoming connections */
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short so_q0len; /* partials on so_q0 */
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short so_qlen; /* number of connections on so_q */
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short so_qlimit; /* max number queued connections */
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short so_timeo; /* connection timeout */
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u_short so_error; /* error affecting connection */
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short so_pgrp; /* pgrp for signals */
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u_long so_oobmark; /* chars to oob mark */
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/*
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* Variables for socket buffering.
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*/
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struct sockbuf {
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u_long sb_cc; /* actual chars in buffer */
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u_long sb_hiwat; /* max actual char count */
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u_long sb_mbcnt; /* chars of mbufs used */
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u_long sb_mbmax; /* max chars of mbufs to use */
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u_long sb_lowat; /* low water mark (not used yet) */
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struct mbuf *sb_mb; /* the mbuf chain */
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struct proc *sb_sel; /* process selecting read/write */
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short sb_timeo; /* timeout (not used yet) */
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short sb_flags; /* flags, see below */
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} so_rcv, so_snd;
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#define SB_MAX (64*1024) /* max chars in sockbuf */
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#define SB_LOCK 0x01 /* lock on data queue (so_rcv only) */
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#define SB_WANT 0x02 /* someone is waiting to lock */
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#define SB_WAIT 0x04 /* someone is waiting for data/space */
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#define SB_SEL 0x08 /* buffer is selected */
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#define SB_COLL 0x10 /* collision selecting */
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/*
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* Hooks for alternative wakeup strategies.
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* These are used by kernel subsystems wishing to access the socket
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* abstraction. If so_wupfunc is nonnull, it is called in place of
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* wakeup any time that wakeup would otherwise be called with an
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* argument whose value is an address lying within a socket structure.
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*/
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struct wupalt *so_wupalt;
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};
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struct wupalt {
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int (*wup_func)(); /* function to call instead of wakeup */
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caddr_t wup_arg; /* argument for so_wupfunc */
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/*
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* Other state information here, for example, for a stream
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* connected to a socket.
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*/
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};
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/*
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* Socket state bits.
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*/
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#define SS_NOFDREF 0x001 /* no file table ref any more */
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#define SS_ISCONNECTED 0x002 /* socket connected to a peer */
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#define SS_ISCONNECTING 0x004 /* in process of connecting to peer */
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#define SS_ISDISCONNECTING 0x008 /* in process of disconnecting */
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#define SS_CANTSENDMORE 0x010 /* can't send more data to peer */
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#define SS_CANTRCVMORE 0x020 /* can't receive more data from peer */
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#define SS_RCVATMARK 0x040 /* at mark on input */
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#define SS_PRIV 0x080 /* privileged for broadcast, raw... */
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#define SS_NBIO 0x100 /* non-blocking ops */
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#define SS_ASYNC 0x200 /* async i/o notify */
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#define SS_PIPE 0x400 /* pipe behavior for POSIX & SVID */
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/*
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* Macros for sockets and socket buffering.
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*/
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/* how much space is there in a socket buffer (so->so_snd or so->so_rcv) */
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#define sbspace(sb) \
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(MIN((int)((sb)->sb_hiwat - (sb)->sb_cc),\
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(int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
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/* do we have to send all at once on a socket? */
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#define sosendallatonce(so) \
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((so)->so_proto->pr_flags & PR_ATOMIC)
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/* can we read something from so? */
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#define soreadable(so) \
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((so)->so_rcv.sb_cc || ((so)->so_state & SS_CANTRCVMORE) || \
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(so)->so_qlen || (so)->so_error)
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/* can we write something to so? */
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#define sowriteable(so) \
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(sbspace(&(so)->so_snd) > 0 && \
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(((so)->so_state&SS_ISCONNECTED) || \
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((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0) || \
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((so)->so_state & SS_CANTSENDMORE) || \
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(so)->so_error)
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/* adjust counters in sb reflecting allocation of m */
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#define sballoc(sb, m) { \
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(sb)->sb_cc += (m)->m_len; \
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(sb)->sb_mbcnt += MSIZE; \
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if ((m)->m_off > MMAXOFF) \
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(sb)->sb_mbcnt += MCLBYTES; \
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}
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/* adjust counters in sb reflecting freeing of m */
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#define sbfree(sb, m) { \
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(sb)->sb_cc -= (m)->m_len; \
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(sb)->sb_mbcnt -= MSIZE; \
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if ((m)->m_off > MMAXOFF) \
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(sb)->sb_mbcnt -= MCLBYTES; \
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}
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/* set lock on sockbuf sb */
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#define sblock(so, sb) { \
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while ((sb)->sb_flags & SB_LOCK) { \
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(sb)->sb_flags |= SB_WANT; \
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(void) sleep((caddr_t)&(sb)->sb_flags, PZERO+1); \
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} \
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(sb)->sb_flags |= SB_LOCK; \
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}
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/* release lock on sockbuf sb */
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#define sbunlock(so, sb) { \
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(sb)->sb_flags &= ~SB_LOCK; \
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if ((sb)->sb_flags & SB_WANT) { \
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(sb)->sb_flags &= ~SB_WANT; \
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if ((so)->so_wupalt) \
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(*(so)->so_wupalt->wup_func)(so, \
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(caddr_t)&(sb)->sb_flags, \
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(so)->so_wupalt->wup_arg);\
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else \
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wakeup((caddr_t)&(sb)->sb_flags); \
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} \
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}
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#define sorwakeup(so) sowakeup((so), &(so)->so_rcv)
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#define sowwakeup(so) sowakeup((so), &(so)->so_snd)
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#ifdef KERNEL
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struct socket *sonewconn();
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#endif
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#endif /*!_sys_socketvar_h*/
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