FreeBSD/Linux Kernel Cross Reference
sys/kern/sys_socket.c
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 * $FreeBSD: src/sys/kern/sys_socket.c,v 1.8.2.1 1999/09/05 08:15:19 peter Exp $
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
53 static int soo_read __P((struct file *fp, struct uio *uio,
54 struct ucred *cred));
55 static int soo_write __P((struct file *fp, struct uio *uio,
56 struct ucred *cred));
57 static int soo_close __P((struct file *fp, struct proc *p));
58
59 struct fileops socketops =
60 { soo_read, soo_write, soo_ioctl, soo_select, soo_close };
61
62 /* ARGSUSED */
63 static int
64 soo_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 */
75 static int
76 soo_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
86 int
87 soo_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
144 int
145 soo_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
186 int
187 soo_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 */
198 static int
199 soo_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 }
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