1/*
2 * Copyright (c) 1982, 1986, 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 * @(#)subr_log.c 8.1 (Berkeley) 6/10/93
| 1/*
2 * Copyright (c) 1982, 1986, 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 * @(#)subr_log.c 8.1 (Berkeley) 6/10/93
|
34 * $Id: subr_log.c,v 1.14 1995/12/08 11:17:06 julian Exp $
| 34 * $Id: subr_log.c,v 1.15 1995/12/08 23:21:33 phk Exp $
|
35 */
36
37/*
38 * Error log buffer for kernel printf's.
39 */
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/conf.h>
44#include <sys/proc.h>
45#include <sys/vnode.h>
46#include <sys/ioctl.h>
47#include <sys/msgbuf.h>
48#include <sys/file.h>
49#include <sys/signalvar.h>
50#include <sys/kernel.h>
51#ifdef DEVFS
52#include <sys/devfsext.h>
53#endif /*DEVFS*/
54
55#define LOG_RDPRI (PZERO + 1)
56
57#define LOG_ASYNC 0x04
58#define LOG_RDWAIT 0x08
59
60static d_open_t logopen;
61static d_close_t logclose;
62static d_read_t logread;
63static d_ioctl_t logioctl;
64static d_select_t logselect;
65
66#define CDEV_MAJOR 7
67static struct cdevsw log_cdevsw =
68 { logopen, logclose, logread, nowrite, /*7*/
69 logioctl, nostop, nullreset, nodevtotty,/* klog */
70 logselect, nommap, NULL, "log", NULL, -1 };
71
| 35 */
36
37/*
38 * Error log buffer for kernel printf's.
39 */
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/conf.h>
44#include <sys/proc.h>
45#include <sys/vnode.h>
46#include <sys/ioctl.h>
47#include <sys/msgbuf.h>
48#include <sys/file.h>
49#include <sys/signalvar.h>
50#include <sys/kernel.h>
51#ifdef DEVFS
52#include <sys/devfsext.h>
53#endif /*DEVFS*/
54
55#define LOG_RDPRI (PZERO + 1)
56
57#define LOG_ASYNC 0x04
58#define LOG_RDWAIT 0x08
59
60static d_open_t logopen;
61static d_close_t logclose;
62static d_read_t logread;
63static d_ioctl_t logioctl;
64static d_select_t logselect;
65
66#define CDEV_MAJOR 7
67static struct cdevsw log_cdevsw =
68 { logopen, logclose, logread, nowrite, /*7*/
69 logioctl, nostop, nullreset, nodevtotty,/* klog */
70 logselect, nommap, NULL, "log", NULL, -1 };
71
|
72struct logsoftc {
| 72static struct logsoftc {
|
73 int sc_state; /* see above for possibilities */
74 struct selinfo sc_selp; /* process waiting on select call */
75 int sc_pgid; /* process/group for async I/O */
76} logsoftc;
77
78int log_open; /* also used in log() */
79
80/*ARGSUSED*/
81static int
82logopen(dev, flags, mode, p)
83 dev_t dev;
84 int flags, mode;
85 struct proc *p;
86{
87 if (log_open)
88 return (EBUSY);
89 log_open = 1;
90 logsoftc.sc_pgid = p->p_pid; /* signal process only */
91 return (0);
92}
93
94/*ARGSUSED*/
95static int
96logclose(dev, flag, mode, p)
97 dev_t dev;
98 int flag, mode;
99 struct proc *p;
100{
101
102 log_open = 0;
103 logsoftc.sc_state = 0;
104 return (0);
105}
106
107/*ARGSUSED*/
108static int
109logread(dev, uio, flag)
110 dev_t dev;
111 struct uio *uio;
112 int flag;
113{
114 register struct msgbuf *mbp = msgbufp;
115 register long l;
116 register int s;
117 int error = 0;
118
119 s = splhigh();
120 while (mbp->msg_bufr == mbp->msg_bufx) {
121 if (flag & IO_NDELAY) {
122 splx(s);
123 return (EWOULDBLOCK);
124 }
125 logsoftc.sc_state |= LOG_RDWAIT;
126 if ((error = tsleep((caddr_t)mbp, LOG_RDPRI | PCATCH,
127 "klog", 0))) {
128 splx(s);
129 return (error);
130 }
131 }
132 splx(s);
133 logsoftc.sc_state &= ~LOG_RDWAIT;
134
135 while (uio->uio_resid > 0) {
136 l = mbp->msg_bufx - mbp->msg_bufr;
137 if (l < 0)
138 l = MSG_BSIZE - mbp->msg_bufr;
139 l = min(l, uio->uio_resid);
140 if (l == 0)
141 break;
142 error = uiomove((caddr_t)&mbp->msg_bufc[mbp->msg_bufr],
143 (int)l, uio);
144 if (error)
145 break;
146 mbp->msg_bufr += l;
147 if (mbp->msg_bufr >= MSG_BSIZE)
148 mbp->msg_bufr = 0;
149 }
150 return (error);
151}
152
153/*ARGSUSED*/
154static int
155logselect(dev, rw, p)
156 dev_t dev;
157 int rw;
158 struct proc *p;
159{
160 int s = splhigh();
161
162 switch (rw) {
163
164 case FREAD:
165 if (msgbufp->msg_bufr != msgbufp->msg_bufx) {
166 splx(s);
167 return (1);
168 }
169 selrecord(p, &logsoftc.sc_selp);
170 break;
171 }
172 splx(s);
173 return (0);
174}
175
176void
177logwakeup()
178{
179 struct proc *p;
180
181 if (!log_open)
182 return;
183 selwakeup(&logsoftc.sc_selp);
184 if (logsoftc.sc_state & LOG_ASYNC) {
185 if (logsoftc.sc_pgid < 0)
186 gsignal(-logsoftc.sc_pgid, SIGIO);
187 else if ((p = pfind(logsoftc.sc_pgid)))
188 psignal(p, SIGIO);
189 }
190 if (logsoftc.sc_state & LOG_RDWAIT) {
191 wakeup((caddr_t)msgbufp);
192 logsoftc.sc_state &= ~LOG_RDWAIT;
193 }
194}
195
196/*ARGSUSED*/
197static int
198logioctl(dev, com, data, flag, p)
199 dev_t dev;
200 int com;
201 caddr_t data;
202 int flag;
203 struct proc *p;
204{
205 long l;
206 int s;
207
208 switch (com) {
209
210 /* return number of characters immediately available */
211 case FIONREAD:
212 s = splhigh();
213 l = msgbufp->msg_bufx - msgbufp->msg_bufr;
214 splx(s);
215 if (l < 0)
216 l += MSG_BSIZE;
217 *(int *)data = l;
218 break;
219
220 case FIONBIO:
221 break;
222
223 case FIOASYNC:
224 if (*(int *)data)
225 logsoftc.sc_state |= LOG_ASYNC;
226 else
227 logsoftc.sc_state &= ~LOG_ASYNC;
228 break;
229
230 case TIOCSPGRP:
231 logsoftc.sc_pgid = *(int *)data;
232 break;
233
234 case TIOCGPGRP:
235 *(int *)data = logsoftc.sc_pgid;
236 break;
237
238 default:
239 return (ENOTTY);
240 }
241 return (0);
242}
243
244static log_devsw_installed = 0;
245static void *log_devfs_token;
246
247static void
248log_drvinit(void *unused)
249{
250 dev_t dev;
251
252 if( ! log_devsw_installed ) {
253 dev = makedev(CDEV_MAJOR,0);
254 cdevsw_add(&dev,&log_cdevsw,NULL);
255 log_devsw_installed = 1;
256#ifdef DEVFS
257 log_devfs_token = devfs_add_devsw(
258 "/", "log", &log_cdevsw, 0, DV_CHR, 0, 0, 0600);
259#endif
260 }
261}
262
263SYSINIT(logdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,log_drvinit,NULL)
264
265
| 73 int sc_state; /* see above for possibilities */
74 struct selinfo sc_selp; /* process waiting on select call */
75 int sc_pgid; /* process/group for async I/O */
76} logsoftc;
77
78int log_open; /* also used in log() */
79
80/*ARGSUSED*/
81static int
82logopen(dev, flags, mode, p)
83 dev_t dev;
84 int flags, mode;
85 struct proc *p;
86{
87 if (log_open)
88 return (EBUSY);
89 log_open = 1;
90 logsoftc.sc_pgid = p->p_pid; /* signal process only */
91 return (0);
92}
93
94/*ARGSUSED*/
95static int
96logclose(dev, flag, mode, p)
97 dev_t dev;
98 int flag, mode;
99 struct proc *p;
100{
101
102 log_open = 0;
103 logsoftc.sc_state = 0;
104 return (0);
105}
106
107/*ARGSUSED*/
108static int
109logread(dev, uio, flag)
110 dev_t dev;
111 struct uio *uio;
112 int flag;
113{
114 register struct msgbuf *mbp = msgbufp;
115 register long l;
116 register int s;
117 int error = 0;
118
119 s = splhigh();
120 while (mbp->msg_bufr == mbp->msg_bufx) {
121 if (flag & IO_NDELAY) {
122 splx(s);
123 return (EWOULDBLOCK);
124 }
125 logsoftc.sc_state |= LOG_RDWAIT;
126 if ((error = tsleep((caddr_t)mbp, LOG_RDPRI | PCATCH,
127 "klog", 0))) {
128 splx(s);
129 return (error);
130 }
131 }
132 splx(s);
133 logsoftc.sc_state &= ~LOG_RDWAIT;
134
135 while (uio->uio_resid > 0) {
136 l = mbp->msg_bufx - mbp->msg_bufr;
137 if (l < 0)
138 l = MSG_BSIZE - mbp->msg_bufr;
139 l = min(l, uio->uio_resid);
140 if (l == 0)
141 break;
142 error = uiomove((caddr_t)&mbp->msg_bufc[mbp->msg_bufr],
143 (int)l, uio);
144 if (error)
145 break;
146 mbp->msg_bufr += l;
147 if (mbp->msg_bufr >= MSG_BSIZE)
148 mbp->msg_bufr = 0;
149 }
150 return (error);
151}
152
153/*ARGSUSED*/
154static int
155logselect(dev, rw, p)
156 dev_t dev;
157 int rw;
158 struct proc *p;
159{
160 int s = splhigh();
161
162 switch (rw) {
163
164 case FREAD:
165 if (msgbufp->msg_bufr != msgbufp->msg_bufx) {
166 splx(s);
167 return (1);
168 }
169 selrecord(p, &logsoftc.sc_selp);
170 break;
171 }
172 splx(s);
173 return (0);
174}
175
176void
177logwakeup()
178{
179 struct proc *p;
180
181 if (!log_open)
182 return;
183 selwakeup(&logsoftc.sc_selp);
184 if (logsoftc.sc_state & LOG_ASYNC) {
185 if (logsoftc.sc_pgid < 0)
186 gsignal(-logsoftc.sc_pgid, SIGIO);
187 else if ((p = pfind(logsoftc.sc_pgid)))
188 psignal(p, SIGIO);
189 }
190 if (logsoftc.sc_state & LOG_RDWAIT) {
191 wakeup((caddr_t)msgbufp);
192 logsoftc.sc_state &= ~LOG_RDWAIT;
193 }
194}
195
196/*ARGSUSED*/
197static int
198logioctl(dev, com, data, flag, p)
199 dev_t dev;
200 int com;
201 caddr_t data;
202 int flag;
203 struct proc *p;
204{
205 long l;
206 int s;
207
208 switch (com) {
209
210 /* return number of characters immediately available */
211 case FIONREAD:
212 s = splhigh();
213 l = msgbufp->msg_bufx - msgbufp->msg_bufr;
214 splx(s);
215 if (l < 0)
216 l += MSG_BSIZE;
217 *(int *)data = l;
218 break;
219
220 case FIONBIO:
221 break;
222
223 case FIOASYNC:
224 if (*(int *)data)
225 logsoftc.sc_state |= LOG_ASYNC;
226 else
227 logsoftc.sc_state &= ~LOG_ASYNC;
228 break;
229
230 case TIOCSPGRP:
231 logsoftc.sc_pgid = *(int *)data;
232 break;
233
234 case TIOCGPGRP:
235 *(int *)data = logsoftc.sc_pgid;
236 break;
237
238 default:
239 return (ENOTTY);
240 }
241 return (0);
242}
243
244static log_devsw_installed = 0;
245static void *log_devfs_token;
246
247static void
248log_drvinit(void *unused)
249{
250 dev_t dev;
251
252 if( ! log_devsw_installed ) {
253 dev = makedev(CDEV_MAJOR,0);
254 cdevsw_add(&dev,&log_cdevsw,NULL);
255 log_devsw_installed = 1;
256#ifdef DEVFS
257 log_devfs_token = devfs_add_devsw(
258 "/", "log", &log_cdevsw, 0, DV_CHR, 0, 0, 0600);
259#endif
260 }
261}
262
263SYSINIT(logdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,log_drvinit,NULL)
264
265
|