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 1.32 1998/11/11 10:55:56 truckman Exp $
| 34 * $Id: subr_log.c,v 1.33 1998/12/07 21:58:29 archie Exp $
|
35 */
36
37/*
38 * Error log buffer for kernel printf's.
39 */
40
41#include "opt_devfs.h"
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/conf.h>
46#include <sys/proc.h>
47#include <sys/vnode.h>
48#include <sys/filio.h>
49#include <sys/ttycom.h>
50#include <sys/msgbuf.h>
51#include <sys/signalvar.h>
52#include <sys/kernel.h>
53#include <sys/poll.h>
54#include <sys/filedesc.h>
55#ifdef DEVFS
56#include <sys/devfsext.h>
57#endif /*DEVFS*/
58
59#define LOG_RDPRI (PZERO + 1)
60
61#define LOG_ASYNC 0x04
62#define LOG_RDWAIT 0x08
63
64static d_open_t logopen;
65static d_close_t logclose;
66static d_read_t logread;
67static d_ioctl_t logioctl;
68static d_poll_t logpoll;
69
70#define CDEV_MAJOR 7
71static struct cdevsw log_cdevsw =
72 { logopen, logclose, logread, nowrite, /*7*/
73 logioctl, nostop, nullreset, nodevtotty,/* klog */
74 logpoll, nommap, NULL, "log", NULL, -1 };
75
76static struct logsoftc {
77 int sc_state; /* see above for possibilities */
78 struct selinfo sc_selp; /* process waiting on select call */
79 struct sigio *sc_sigio; /* information for async I/O */
80} logsoftc;
81
82int log_open; /* also used in log() */
83
84/*ARGSUSED*/
85static int
86logopen(dev, flags, mode, p)
87 dev_t dev;
88 int flags, mode;
89 struct proc *p;
90{
91 if (log_open)
92 return (EBUSY);
93 log_open = 1;
94 fsetown(p->p_pid, &logsoftc.sc_sigio); /* signal process only */
95 return (0);
96}
97
98/*ARGSUSED*/
99static int
100logclose(dev, flag, mode, p)
101 dev_t dev;
102 int flag, mode;
103 struct proc *p;
104{
105
106 log_open = 0;
107 logsoftc.sc_state = 0;
108 funsetown(logsoftc.sc_sigio);
109 return (0);
110}
111
112/*ARGSUSED*/
113static int
114logread(dev, uio, flag)
115 dev_t dev;
116 struct uio *uio;
117 int flag;
118{
119 register struct msgbuf *mbp = msgbufp;
120 register long l;
121 register int s;
122 int error = 0;
123
124 s = splhigh();
125 while (mbp->msg_bufr == mbp->msg_bufx) {
126 if (flag & IO_NDELAY) {
127 splx(s);
128 return (EWOULDBLOCK);
129 }
130 logsoftc.sc_state |= LOG_RDWAIT;
131 if ((error = tsleep((caddr_t)mbp, LOG_RDPRI | PCATCH,
132 "klog", 0))) {
133 splx(s);
134 return (error);
135 }
136 }
137 splx(s);
138 logsoftc.sc_state &= ~LOG_RDWAIT;
139
140 while (uio->uio_resid > 0) {
141 l = mbp->msg_bufx - mbp->msg_bufr;
142 if (l < 0)
143 l = mbp->msg_size - mbp->msg_bufr;
144 l = min(l, uio->uio_resid);
145 if (l == 0)
146 break;
147 error = uiomove((caddr_t)msgbufp->msg_ptr + mbp->msg_bufr,
148 (int)l, uio);
149 if (error)
150 break;
151 mbp->msg_bufr += l;
152 if (mbp->msg_bufr >= mbp->msg_size)
153 mbp->msg_bufr = 0;
154 }
155 return (error);
156}
157
158/*ARGSUSED*/
159static int
160logpoll(dev, events, p)
161 dev_t dev;
162 int events;
163 struct proc *p;
164{
165 int s;
166 int revents = 0;
167
168 s = splhigh();
169
| 35 */
36
37/*
38 * Error log buffer for kernel printf's.
39 */
40
41#include "opt_devfs.h"
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/conf.h>
46#include <sys/proc.h>
47#include <sys/vnode.h>
48#include <sys/filio.h>
49#include <sys/ttycom.h>
50#include <sys/msgbuf.h>
51#include <sys/signalvar.h>
52#include <sys/kernel.h>
53#include <sys/poll.h>
54#include <sys/filedesc.h>
55#ifdef DEVFS
56#include <sys/devfsext.h>
57#endif /*DEVFS*/
58
59#define LOG_RDPRI (PZERO + 1)
60
61#define LOG_ASYNC 0x04
62#define LOG_RDWAIT 0x08
63
64static d_open_t logopen;
65static d_close_t logclose;
66static d_read_t logread;
67static d_ioctl_t logioctl;
68static d_poll_t logpoll;
69
70#define CDEV_MAJOR 7
71static struct cdevsw log_cdevsw =
72 { logopen, logclose, logread, nowrite, /*7*/
73 logioctl, nostop, nullreset, nodevtotty,/* klog */
74 logpoll, nommap, NULL, "log", NULL, -1 };
75
76static struct logsoftc {
77 int sc_state; /* see above for possibilities */
78 struct selinfo sc_selp; /* process waiting on select call */
79 struct sigio *sc_sigio; /* information for async I/O */
80} logsoftc;
81
82int log_open; /* also used in log() */
83
84/*ARGSUSED*/
85static int
86logopen(dev, flags, mode, p)
87 dev_t dev;
88 int flags, mode;
89 struct proc *p;
90{
91 if (log_open)
92 return (EBUSY);
93 log_open = 1;
94 fsetown(p->p_pid, &logsoftc.sc_sigio); /* signal process only */
95 return (0);
96}
97
98/*ARGSUSED*/
99static int
100logclose(dev, flag, mode, p)
101 dev_t dev;
102 int flag, mode;
103 struct proc *p;
104{
105
106 log_open = 0;
107 logsoftc.sc_state = 0;
108 funsetown(logsoftc.sc_sigio);
109 return (0);
110}
111
112/*ARGSUSED*/
113static int
114logread(dev, uio, flag)
115 dev_t dev;
116 struct uio *uio;
117 int flag;
118{
119 register struct msgbuf *mbp = msgbufp;
120 register long l;
121 register int s;
122 int error = 0;
123
124 s = splhigh();
125 while (mbp->msg_bufr == mbp->msg_bufx) {
126 if (flag & IO_NDELAY) {
127 splx(s);
128 return (EWOULDBLOCK);
129 }
130 logsoftc.sc_state |= LOG_RDWAIT;
131 if ((error = tsleep((caddr_t)mbp, LOG_RDPRI | PCATCH,
132 "klog", 0))) {
133 splx(s);
134 return (error);
135 }
136 }
137 splx(s);
138 logsoftc.sc_state &= ~LOG_RDWAIT;
139
140 while (uio->uio_resid > 0) {
141 l = mbp->msg_bufx - mbp->msg_bufr;
142 if (l < 0)
143 l = mbp->msg_size - mbp->msg_bufr;
144 l = min(l, uio->uio_resid);
145 if (l == 0)
146 break;
147 error = uiomove((caddr_t)msgbufp->msg_ptr + mbp->msg_bufr,
148 (int)l, uio);
149 if (error)
150 break;
151 mbp->msg_bufr += l;
152 if (mbp->msg_bufr >= mbp->msg_size)
153 mbp->msg_bufr = 0;
154 }
155 return (error);
156}
157
158/*ARGSUSED*/
159static int
160logpoll(dev, events, p)
161 dev_t dev;
162 int events;
163 struct proc *p;
164{
165 int s;
166 int revents = 0;
167
168 s = splhigh();
169
|
170 if (events & (POLLIN | POLLRDNORM))
| 170 if (events & (POLLIN | POLLRDNORM)) {
|
171 if (msgbufp->msg_bufr != msgbufp->msg_bufx)
172 revents |= events & (POLLIN | POLLRDNORM);
173 else
174 selrecord(p, &logsoftc.sc_selp);
| 171 if (msgbufp->msg_bufr != msgbufp->msg_bufx)
172 revents |= events & (POLLIN | POLLRDNORM);
173 else
174 selrecord(p, &logsoftc.sc_selp);
|
175
| 175 }
|
176 splx(s);
177 return (revents);
178}
179
180void
181logwakeup()
182{
183 if (!log_open)
184 return;
185 selwakeup(&logsoftc.sc_selp);
186 if ((logsoftc.sc_state & LOG_ASYNC) && logsoftc.sc_sigio != NULL)
187 pgsigio(logsoftc.sc_sigio, SIGIO, 0);
188 if (logsoftc.sc_state & LOG_RDWAIT) {
189 wakeup((caddr_t)msgbufp);
190 logsoftc.sc_state &= ~LOG_RDWAIT;
191 }
192}
193
194/*ARGSUSED*/
195static int
196logioctl(dev, com, data, flag, p)
197 dev_t dev;
198 u_long com;
199 caddr_t data;
200 int flag;
201 struct proc *p;
202{
203 long l;
204 int s;
205
206 switch (com) {
207
208 /* return number of characters immediately available */
209 case FIONREAD:
210 s = splhigh();
211 l = msgbufp->msg_bufx - msgbufp->msg_bufr;
212 splx(s);
213 if (l < 0)
214 l += msgbufp->msg_size;
215 *(int *)data = l;
216 break;
217
218 case FIONBIO:
219 break;
220
221 case FIOASYNC:
222 if (*(int *)data)
223 logsoftc.sc_state |= LOG_ASYNC;
224 else
225 logsoftc.sc_state &= ~LOG_ASYNC;
226 break;
227
228 case FIOSETOWN:
229 return (fsetown(*(int *)data, &logsoftc.sc_sigio));
230
231 case FIOGETOWN:
232 *(int *)data = fgetown(logsoftc.sc_sigio);
233 break;
234
235 /* This is deprecated, FIOSETOWN should be used instead. */
236 case TIOCSPGRP:
237 return (fsetown(-(*(int *)data), &logsoftc.sc_sigio));
238
239 /* This is deprecated, FIOGETOWN should be used instead */
240 case TIOCGPGRP:
241 *(int *)data = -fgetown(logsoftc.sc_sigio);
242 break;
243
244 default:
245 return (ENOTTY);
246 }
247 return (0);
248}
249
250static int log_devsw_installed;
251#ifdef DEVFS
252static void *log_devfs_token;
253#endif
254
255static void log_drvinit __P((void *unused));
256static void
257log_drvinit(unused)
258 void *unused;
259{
260 dev_t dev;
261
262 if( ! log_devsw_installed ) {
263 dev = makedev(CDEV_MAJOR,0);
264 cdevsw_add(&dev,&log_cdevsw,NULL);
265 log_devsw_installed = 1;
266#ifdef DEVFS
267 log_devfs_token = devfs_add_devswf(&log_cdevsw, 0, DV_CHR,
268 UID_ROOT, GID_WHEEL, 0600,
269 "klog");
270#endif
271 }
272}
273
274SYSINIT(logdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,log_drvinit,NULL)
| 176 splx(s);
177 return (revents);
178}
179
180void
181logwakeup()
182{
183 if (!log_open)
184 return;
185 selwakeup(&logsoftc.sc_selp);
186 if ((logsoftc.sc_state & LOG_ASYNC) && logsoftc.sc_sigio != NULL)
187 pgsigio(logsoftc.sc_sigio, SIGIO, 0);
188 if (logsoftc.sc_state & LOG_RDWAIT) {
189 wakeup((caddr_t)msgbufp);
190 logsoftc.sc_state &= ~LOG_RDWAIT;
191 }
192}
193
194/*ARGSUSED*/
195static int
196logioctl(dev, com, data, flag, p)
197 dev_t dev;
198 u_long com;
199 caddr_t data;
200 int flag;
201 struct proc *p;
202{
203 long l;
204 int s;
205
206 switch (com) {
207
208 /* return number of characters immediately available */
209 case FIONREAD:
210 s = splhigh();
211 l = msgbufp->msg_bufx - msgbufp->msg_bufr;
212 splx(s);
213 if (l < 0)
214 l += msgbufp->msg_size;
215 *(int *)data = l;
216 break;
217
218 case FIONBIO:
219 break;
220
221 case FIOASYNC:
222 if (*(int *)data)
223 logsoftc.sc_state |= LOG_ASYNC;
224 else
225 logsoftc.sc_state &= ~LOG_ASYNC;
226 break;
227
228 case FIOSETOWN:
229 return (fsetown(*(int *)data, &logsoftc.sc_sigio));
230
231 case FIOGETOWN:
232 *(int *)data = fgetown(logsoftc.sc_sigio);
233 break;
234
235 /* This is deprecated, FIOSETOWN should be used instead. */
236 case TIOCSPGRP:
237 return (fsetown(-(*(int *)data), &logsoftc.sc_sigio));
238
239 /* This is deprecated, FIOGETOWN should be used instead */
240 case TIOCGPGRP:
241 *(int *)data = -fgetown(logsoftc.sc_sigio);
242 break;
243
244 default:
245 return (ENOTTY);
246 }
247 return (0);
248}
249
250static int log_devsw_installed;
251#ifdef DEVFS
252static void *log_devfs_token;
253#endif
254
255static void log_drvinit __P((void *unused));
256static void
257log_drvinit(unused)
258 void *unused;
259{
260 dev_t dev;
261
262 if( ! log_devsw_installed ) {
263 dev = makedev(CDEV_MAJOR,0);
264 cdevsw_add(&dev,&log_cdevsw,NULL);
265 log_devsw_installed = 1;
266#ifdef DEVFS
267 log_devfs_token = devfs_add_devswf(&log_cdevsw, 0, DV_CHR,
268 UID_ROOT, GID_WHEEL, 0600,
269 "klog");
270#endif
271 }
272}
273
274SYSINIT(logdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,log_drvinit,NULL)
|