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/*
* Mach Operating System
* Copyright (c) 1989 Carnegie-Mellon University
* Copyright (c) 1988 Carnegie-Mellon University
* Copyright (c) 1987 Carnegie-Mellon University
* All rights reserved. The CMU software License Agreement specifies
* the terms and conditions for use and redistribution.
*/
/*
* HISTORY
* $Log: socketvar.h,v $
* Revision 2.5 89/08/08 21:50:35 jsb
* Made sballoc/sbfree only charge for 1k on large mbufs. Strange
* as it might look, this is really the only thing that works on
* machines with CLBYTES > 1k. Sigh.
* [89/07/23 af]
*
* Revision 2.4 89/03/09 22:07:44 rpd
* More cleanup.
*
* Revision 2.2 88/08/24 02:45:07 mwyoung
* Adjusted include file references.
* [88/08/17 02:23:25 mwyoung]
*
* 25-Jan-86 Avadis Tevanian (avie) at Carnegie-Mellon University
* Upgrade to 4.3.
*
*/
/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
* @(#)socketvar.h 7.1 (Berkeley) 6/4/86
*/
#ifndef _SYS_SOCKETVAR_H_
#define _SYS_SOCKETVAR_H_
#import <sys/types.h>
#import <sys/param.h> /* for MIN */
/*
* 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 */
short so_q0len; /* partials on so_q0 */
struct socket *so_q; /* queue of incoming connections */
short so_qlen; /* number of connections on so_q */
short so_qlimit; /* max number queued connections */
/*
* Variables for socket buffering.
*/
struct sockbuf {
u_short sb_cc; /* actual chars in buffer */
u_short sb_hiwat; /* max actual char count */
u_short sb_mbcnt; /* chars of mbufs used */
u_short sb_mbmax; /* max chars of mbufs to use */
u_short sb_lowat; /* low water mark (not used yet) */
short sb_timeo; /* timeout (not used yet) */
struct mbuf *sb_mb; /* the mbuf chain */
struct proc *sb_sel; /* process selecting read/write */
short sb_flags; /* flags, see below */
} so_rcv, so_snd;
#define SB_MAX 65535 /* 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 */
short so_timeo; /* connection timeout */
u_short so_error; /* error affecting connection */
u_short so_oobmark; /* chars to oob mark */
short so_pgrp; /* pgrp for signals */
};
/*
* 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 */
/*
* 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((int)((sb)->sb_hiwat - (sb)->sb_cc), \
(int)((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)
#ifdef KERNEL
#import <kernserv/macro_help.h>
/* adjust counters in sb reflecting allocation of m */
#define sballoc(sb, m) \
MACRO_BEGIN \
(sb)->sb_cc += (m)->m_len; \
(sb)->sb_mbcnt += MSIZE; \
if ((m)->m_off > MMAXOFF) \
(sb)->sb_mbcnt += 1024; \
MACRO_END
/* adjust counters in sb reflecting freeing of m */
#define sbfree(sb, m) \
MACRO_BEGIN \
(sb)->sb_cc -= (m)->m_len; \
(sb)->sb_mbcnt -= MSIZE; \
if ((m)->m_off > MMAXOFF) \
(sb)->sb_mbcnt -= 1024; \
MACRO_END
/* set lock on sockbuf sb */
#define sblock(sb) \
MACRO_BEGIN \
while ((sb)->sb_flags & SB_LOCK) { \
(sb)->sb_flags |= SB_WANT; \
sleep((caddr_t)&(sb)->sb_flags, PZERO+1); \
} \
(sb)->sb_flags |= SB_LOCK; \
MACRO_END
/* release lock on sockbuf sb */
#define sbunlock(sb) \
MACRO_BEGIN \
(sb)->sb_flags &= ~SB_LOCK; \
if ((sb)->sb_flags & SB_WANT) { \
(sb)->sb_flags &= ~SB_WANT; \
wakeup((caddr_t)&(sb)->sb_flags); \
} \
MACRO_END
extern struct socket *sonewconn();
#define sorwakeup(so) sowakeup((so), &(so)->so_rcv)
#define sowwakeup(so) sowakeup((so), &(so)->so_snd)
#endif
#endif
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