home *** CD-ROM | disk | FTP | other *** search
- /*-
- * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)socketvar.h 7.17 (Berkeley) 5/5/91
- */
-
- /*
- * 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 */
- pid_t so_pgid; /* pgid 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 */
- long sb_lowat; /* low water mark */
- struct mbuf *sb_mb; /* the mbuf chain */
- struct proc *sb_sel; /* process selecting read/write */
- short sb_flags; /* flags, see below */
- short sb_timeo; /* timeout for read/write */
- } so_rcv, so_snd;
- #define SB_MAX (64*1024) /* default for max chars in sockbuf */
- #define SB_LOCK 0x01 /* lock on data queue */
- #define SB_WANT 0x02 /* someone is waiting to lock */
- #define SB_WAIT 0x04 /* someone is waiting for data/space */
- #define SB_SEL 0x08 /* someone is selecting */
- #define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
- #define SB_NOTIFY (SB_WAIT|SB_SEL|SB_ASYNC)
- #define SB_COLL 0x20 /* collision selecting */
- #define SB_NOINTR 0x40 /* operations not interruptible */
-
- caddr_t so_tpcb; /* Wisc. protocol control block XXX */
- };
-
- /*
- * 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_ISCONFIRMING 0x400 /* deciding to accept connection req */
- #define SS_BOUND 0x800 /* socket is bound to a "port" */
- #define SS_CANREAD 0x1000 /* can "read" from socket - affected by shutdown() */
- #define SS_CANWRITE 0x2000 /* can "write" from socket - affected by shutdown() */
- #define SS_CANREADWRITE (SS_CANREAD | SS_CANWRITE)
-
-
- /*
- * Macros for sockets and socket buffering.
- */
-
- /*
- * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
- * This is problematical if the fields are unsigned, as the space might
- * still be negative (cc > hiwat or mbcnt > mbmax). Should detect
- * overflow and return 0. Should use "lmin" but it doesn't exist now.
- */
- #define sbspace(sb) \
- ((long) imin((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_rcv.sb_lowat || \
- ((so)->so_state & SS_CANTRCVMORE) || \
- (so)->so_qlen || (so)->so_error)
-
- /* can we write something to so? */
- #define sowriteable(so) \
- (sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
- (((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 += MSIZE; \
- if ((m)->m_flags & M_EXT) \
- (sb)->sb_mbcnt += (m)->m_ext.ext_size; \
- }
-
- /* adjust counters in sb reflecting freeing of m */
- #define sbfree(sb, m) { \
- (sb)->sb_cc -= (m)->m_len; \
- (sb)->sb_mbcnt -= MSIZE; \
- if ((m)->m_flags & M_EXT) \
- (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
- }
-
- /*
- * Set lock on sockbuf sb; sleep if lock is already held.
- * Unless SB_NOINTR is set on sockbuf, sleep is interruptible.
- * Returns error without lock if sleep is interrupted.
- */
- #define sblock(sb) ((sb)->sb_flags & SB_LOCK ? sb_lock(sb) : \
- ((sb)->sb_flags |= SB_LOCK, 0))
-
- /* 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); \
- } \
- }
-
- #define sorwakeup(so) sowakeup((so), &(so)->so_rcv)
- #define sowwakeup(so) sowakeup((so), &(so)->so_snd)
-
- #ifdef _KERNEL
- u_long sb_max;
- /* to catch callers missing new second argument to sonewconn: */
- #define sonewconn(head, connstatus) sonewconn1((head), (connstatus))
- struct socket *sonewconn1 __P((struct socket *head, int connstatus));
-
- /* strings for sleep message: */
- extern char netio[], netcon[], netcls[];
-
- #if 0
- /*
- * File operations on sockets.
- */
- int soo_read __P((struct file *fp, struct uio *uio, struct ucred *cred));
- int soo_write __P((struct file *fp, struct uio *uio, struct ucred *cred));
- int soo_ioctl __P((struct file *fp, int com, caddr_t data, struct proc *p));
- int soo_select __P((struct file *fp, int which, struct proc *p));
- int soo_close __P((struct file *fp, struct proc *p));
- #endif
-
- #endif
-