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Diffstat (limited to 'sys/sys/socketvar.h')
| -rw-r--r-- | sys/sys/socketvar.h | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/sys/sys/socketvar.h b/sys/sys/socketvar.h new file mode 100644 index 000000000000..ff104046c7c3 --- /dev/null +++ b/sys/sys/socketvar.h @@ -0,0 +1,207 @@ +/*- + * Copyright (c) 1982, 1986, 1990, 1993 + * 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 8.1 (Berkeley) 6/2/93 + */ + +#include <sys/select.h> /* for struct selinfo */ + +/* + * 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 selinfo 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 (256*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_NOINTR 0x40 /* operations not interruptible */ + + caddr_t so_tpcb; /* Wisc. protocol control block XXX */ + void (*so_upcall) __P((struct socket *so, caddr_t arg, int waitf)); + caddr_t so_upcallarg; /* Arg for above */ +}; + +/* + * 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 */ + + +/* + * 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, wf) ((sb)->sb_flags & SB_LOCK ? \ + (((wf) == M_WAITOK) ? sb_lock(sb) : EWOULDBLOCK) : \ + ((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); \ + if ((so)->so_upcall) \ + (*((so)->so_upcall))((so), (so)->so_upcallarg, M_DONTWAIT); \ + } + +#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[]; + +/* + * 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 |