sys_socket.c revision 22975 
1/*
2 * Copyright (c) 1982, 1986, 1990, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 *	@(#)sys_socket.c	8.1 (Berkeley) 6/10/93
34 * $Id$
35 */
36
37#include <sys/param.h>
38#include <sys/queue.h>
39#include <sys/systm.h>
40#include <sys/proc.h>
41#include <sys/file.h>
42#include <sys/mbuf.h>
43#include <sys/protosw.h>
44#include <sys/socket.h>
45#include <sys/stat.h>
46#include <sys/socketvar.h>
47#include <sys/ioctl.h>
48#include <sys/stat.h>
49
50#include <net/if.h>
51#include <net/route.h>
52
53static int soo_read __P((struct file *fp, struct uio *uio,
54		struct ucred *cred));
55static int soo_write __P((struct file *fp, struct uio *uio,
56		struct ucred *cred));
57static int soo_close __P((struct file *fp, struct proc *p));
58
59struct	fileops socketops =
60    { soo_read, soo_write, soo_ioctl, soo_select, soo_close };
61
62/* ARGSUSED */
63static int
64soo_read(fp, uio, cred)
65	struct file *fp;
66	struct uio *uio;
67	struct ucred *cred;
68{
69
70	return (soreceive((struct socket *)fp->f_data, (struct mbuf **)0,
71		uio, (struct mbuf **)0, (struct mbuf **)0, (int *)0));
72}
73
74/* ARGSUSED */
75static int
76soo_write(fp, uio, cred)
77	struct file *fp;
78	struct uio *uio;
79	struct ucred *cred;
80{
81
82	return (sosend((struct socket *)fp->f_data, (struct mbuf *)0,
83		uio, (struct mbuf *)0, (struct mbuf *)0, 0));
84}
85
86int
87soo_ioctl(fp, cmd, data, p)
88	struct file *fp;
89	int cmd;
90	register caddr_t data;
91	struct proc *p;
92{
93	register struct socket *so = (struct socket *)fp->f_data;
94
95	switch (cmd) {
96
97	case FIONBIO:
98		if (*(int *)data)
99			so->so_state |= SS_NBIO;
100		else
101			so->so_state &= ~SS_NBIO;
102		return (0);
103
104	case FIOASYNC:
105		if (*(int *)data) {
106			so->so_state |= SS_ASYNC;
107			so->so_rcv.sb_flags |= SB_ASYNC;
108			so->so_snd.sb_flags |= SB_ASYNC;
109		} else {
110			so->so_state &= ~SS_ASYNC;
111			so->so_rcv.sb_flags &= ~SB_ASYNC;
112			so->so_snd.sb_flags &= ~SB_ASYNC;
113		}
114		return (0);
115
116	case FIONREAD:
117		*(int *)data = so->so_rcv.sb_cc;
118		return (0);
119
120	case SIOCSPGRP:
121		so->so_pgid = *(int *)data;
122		return (0);
123
124	case SIOCGPGRP:
125		*(int *)data = so->so_pgid;
126		return (0);
127
128	case SIOCATMARK:
129		*(int *)data = (so->so_state&SS_RCVATMARK) != 0;
130		return (0);
131	}
132	/*
133	 * Interface/routing/protocol specific ioctls:
134	 * interface and routing ioctls should have a
135	 * different entry since a socket's unnecessary
136	 */
137	if (IOCGROUP(cmd) == 'i')
138		return (ifioctl(so, cmd, data, p));
139	if (IOCGROUP(cmd) == 'r')
140		return (rtioctl(cmd, data, p));
141	return ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 0));
142}
143
144int
145soo_select(fp, which, p)
146	struct file *fp;
147	int which;
148	struct proc *p;
149{
150	register struct socket *so = (struct socket *)fp->f_data;
151	register int s = splnet();
152
153	switch (which) {
154
155	case FREAD:
156		if (soreadable(so)) {
157			splx(s);
158			return (1);
159		}
160		selrecord(p, &so->so_rcv.sb_sel);
161		so->so_rcv.sb_flags |= SB_SEL;
162		break;
163
164	case FWRITE:
165		if (sowriteable(so)) {
166			splx(s);
167			return (1);
168		}
169		selrecord(p, &so->so_snd.sb_sel);
170		so->so_snd.sb_flags |= SB_SEL;
171		break;
172
173	case 0:
174		if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) {
175			splx(s);
176			return (1);
177		}
178		selrecord(p, &so->so_rcv.sb_sel);
179		so->so_rcv.sb_flags |= SB_SEL;
180		break;
181	}
182	splx(s);
183	return (0);
184}
185
186int
187soo_stat(so, ub)
188	register struct socket *so;
189	register struct stat *ub;
190{
191
192	bzero((caddr_t)ub, sizeof (*ub));
193	ub->st_mode = S_IFSOCK;
194	return ((*so->so_proto->pr_usrreqs->pru_sense)(so, ub));
195}
196
197/* ARGSUSED */
198static int
199soo_close(fp, p)
200	struct file *fp;
201	struct proc *p;
202{
203	int error = 0;
204
205	if (fp->f_data)
206		error = soclose((struct socket *)fp->f_data);
207	fp->f_data = 0;
208	return (error);
209}
210