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 * $FreeBSD: head/sys/kern/subr_log.c 106917 2002-11-14 16:11:12Z tmm $
| 34 * $FreeBSD: head/sys/kern/subr_log.c 111741 2003-03-02 15:50:23Z des $
|
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/filio.h>
47#include <sys/ttycom.h>
48#include <sys/msgbuf.h>
49#include <sys/signalvar.h>
50#include <sys/kernel.h>
51#include <sys/poll.h>
52#include <sys/filedesc.h>
53#include <sys/sysctl.h>
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_poll_t logpoll;
65
66static void logtimeout(void *arg);
67
68#define CDEV_MAJOR 7
69static struct cdevsw log_cdevsw = {
70 /* open */ logopen,
71 /* close */ logclose,
72 /* read */ logread,
73 /* write */ nowrite,
74 /* ioctl */ logioctl,
75 /* poll */ logpoll,
76 /* mmap */ nommap,
77 /* strategy */ nostrategy,
78 /* name */ "log",
79 /* maj */ CDEV_MAJOR,
80 /* dump */ nodump,
81 /* psize */ nopsize,
82 /* flags */ 0,
83};
84
85static struct logsoftc {
86 int sc_state; /* see above for possibilities */
87 struct selinfo sc_selp; /* process waiting on select call */
88 struct sigio *sc_sigio; /* information for async I/O */
89 struct callout sc_callout; /* callout to wakeup syslog */
90} logsoftc;
91
92int log_open; /* also used in log() */
93
94/* Times per second to check for a pending syslog wakeup. */
95static int log_wakeups_per_second = 5;
96SYSCTL_INT(_kern, OID_AUTO, log_wakeups_per_second, CTLFLAG_RW,
97 &log_wakeups_per_second, 0, "");
98
99/*ARGSUSED*/
100static int
101logopen(dev_t dev, int flags, int mode, struct thread *td)
102{
103 if (log_open)
104 return (EBUSY);
105 log_open = 1;
106 callout_init(&logsoftc.sc_callout, 0);
107 fsetown(td->td_proc->p_pid, &logsoftc.sc_sigio); /* signal process only */
108 callout_reset(&logsoftc.sc_callout, hz / log_wakeups_per_second,
109 logtimeout, NULL);
110 return (0);
111}
112
113/*ARGSUSED*/
114static int
115logclose(dev_t dev, int flag, int mode, struct thread *td)
116{
117
118 log_open = 0;
119 callout_stop(&logsoftc.sc_callout);
120 logsoftc.sc_state = 0;
121 funsetown(&logsoftc.sc_sigio);
122 return (0);
123}
124
125/*ARGSUSED*/
126static int
127logread(dev_t dev, struct uio *uio, int flag)
128{
129 struct msgbuf *mbp = msgbufp;
130 int error = 0, l, s;
131
132 s = splhigh();
133 while (mbp->msg_bufr == mbp->msg_bufx) {
134 if (flag & IO_NDELAY) {
135 splx(s);
136 return (EWOULDBLOCK);
137 }
138 logsoftc.sc_state |= LOG_RDWAIT;
139 if ((error = tsleep(mbp, LOG_RDPRI | PCATCH, "klog", 0))) {
140 splx(s);
141 return (error);
142 }
143 }
144 splx(s);
145 logsoftc.sc_state &= ~LOG_RDWAIT;
146
147 while (uio->uio_resid > 0) {
148 l = mbp->msg_bufx - mbp->msg_bufr;
149 if (l < 0)
150 l = mbp->msg_size - mbp->msg_bufr;
151 l = imin(l, uio->uio_resid);
152 if (l == 0)
153 break;
| 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/filio.h>
47#include <sys/ttycom.h>
48#include <sys/msgbuf.h>
49#include <sys/signalvar.h>
50#include <sys/kernel.h>
51#include <sys/poll.h>
52#include <sys/filedesc.h>
53#include <sys/sysctl.h>
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_poll_t logpoll;
65
66static void logtimeout(void *arg);
67
68#define CDEV_MAJOR 7
69static struct cdevsw log_cdevsw = {
70 /* open */ logopen,
71 /* close */ logclose,
72 /* read */ logread,
73 /* write */ nowrite,
74 /* ioctl */ logioctl,
75 /* poll */ logpoll,
76 /* mmap */ nommap,
77 /* strategy */ nostrategy,
78 /* name */ "log",
79 /* maj */ CDEV_MAJOR,
80 /* dump */ nodump,
81 /* psize */ nopsize,
82 /* flags */ 0,
83};
84
85static struct logsoftc {
86 int sc_state; /* see above for possibilities */
87 struct selinfo sc_selp; /* process waiting on select call */
88 struct sigio *sc_sigio; /* information for async I/O */
89 struct callout sc_callout; /* callout to wakeup syslog */
90} logsoftc;
91
92int log_open; /* also used in log() */
93
94/* Times per second to check for a pending syslog wakeup. */
95static int log_wakeups_per_second = 5;
96SYSCTL_INT(_kern, OID_AUTO, log_wakeups_per_second, CTLFLAG_RW,
97 &log_wakeups_per_second, 0, "");
98
99/*ARGSUSED*/
100static int
101logopen(dev_t dev, int flags, int mode, struct thread *td)
102{
103 if (log_open)
104 return (EBUSY);
105 log_open = 1;
106 callout_init(&logsoftc.sc_callout, 0);
107 fsetown(td->td_proc->p_pid, &logsoftc.sc_sigio); /* signal process only */
108 callout_reset(&logsoftc.sc_callout, hz / log_wakeups_per_second,
109 logtimeout, NULL);
110 return (0);
111}
112
113/*ARGSUSED*/
114static int
115logclose(dev_t dev, int flag, int mode, struct thread *td)
116{
117
118 log_open = 0;
119 callout_stop(&logsoftc.sc_callout);
120 logsoftc.sc_state = 0;
121 funsetown(&logsoftc.sc_sigio);
122 return (0);
123}
124
125/*ARGSUSED*/
126static int
127logread(dev_t dev, struct uio *uio, int flag)
128{
129 struct msgbuf *mbp = msgbufp;
130 int error = 0, l, s;
131
132 s = splhigh();
133 while (mbp->msg_bufr == mbp->msg_bufx) {
134 if (flag & IO_NDELAY) {
135 splx(s);
136 return (EWOULDBLOCK);
137 }
138 logsoftc.sc_state |= LOG_RDWAIT;
139 if ((error = tsleep(mbp, LOG_RDPRI | PCATCH, "klog", 0))) {
140 splx(s);
141 return (error);
142 }
143 }
144 splx(s);
145 logsoftc.sc_state &= ~LOG_RDWAIT;
146
147 while (uio->uio_resid > 0) {
148 l = mbp->msg_bufx - mbp->msg_bufr;
149 if (l < 0)
150 l = mbp->msg_size - mbp->msg_bufr;
151 l = imin(l, uio->uio_resid);
152 if (l == 0)
153 break;
|
154 error = uiomove((caddr_t)msgbufp->msg_ptr + mbp->msg_bufr,
| 154 error = uiomove((char *)msgbufp->msg_ptr + mbp->msg_bufr,
|
155 l, uio);
156 if (error)
157 break;
158 mbp->msg_bufr += l;
159 if (mbp->msg_bufr >= mbp->msg_size)
160 mbp->msg_bufr = 0;
161 }
162 return (error);
163}
164
165/*ARGSUSED*/
166static int
167logpoll(dev_t dev, int events, struct thread *td)
168{
169 int s;
170 int revents = 0;
171
172 s = splhigh();
173
174 if (events & (POLLIN | POLLRDNORM)) {
175 if (msgbufp->msg_bufr != msgbufp->msg_bufx)
176 revents |= events & (POLLIN | POLLRDNORM);
177 else
178 selrecord(td, &logsoftc.sc_selp);
179 }
180 splx(s);
181 return (revents);
182}
183
184static void
185logtimeout(void *arg)
186{
187
188 if (!log_open)
189 return;
190 if (msgbuftrigger == 0) {
191 callout_reset(&logsoftc.sc_callout,
192 hz / log_wakeups_per_second, logtimeout, NULL);
193 return;
194 }
195 msgbuftrigger = 0;
196 selwakeup(&logsoftc.sc_selp);
197 if ((logsoftc.sc_state & LOG_ASYNC) && logsoftc.sc_sigio != NULL)
198 pgsigio(&logsoftc.sc_sigio, SIGIO, 0);
199 if (logsoftc.sc_state & LOG_RDWAIT) {
200 wakeup((caddr_t)msgbufp);
201 logsoftc.sc_state &= ~LOG_RDWAIT;
202 }
203 callout_reset(&logsoftc.sc_callout, hz / log_wakeups_per_second,
204 logtimeout, NULL);
205}
206
207/*ARGSUSED*/
208static int
209logioctl(dev_t dev, u_long com, caddr_t data, int flag, struct thread *td)
210{
211 int l, s;
212
213 switch (com) {
214
215 /* return number of characters immediately available */
216 case FIONREAD:
217 s = splhigh();
218 l = msgbufp->msg_bufx - msgbufp->msg_bufr;
219 splx(s);
220 if (l < 0)
221 l += msgbufp->msg_size;
222 *(int *)data = l;
223 break;
224
225 case FIONBIO:
226 break;
227
228 case FIOASYNC:
229 if (*(int *)data)
230 logsoftc.sc_state |= LOG_ASYNC;
231 else
232 logsoftc.sc_state &= ~LOG_ASYNC;
233 break;
234
235 case FIOSETOWN:
236 return (fsetown(*(int *)data, &logsoftc.sc_sigio));
237
238 case FIOGETOWN:
239 *(int *)data = fgetown(&logsoftc.sc_sigio);
240 break;
241
242 /* This is deprecated, FIOSETOWN should be used instead. */
243 case TIOCSPGRP:
244 return (fsetown(-(*(int *)data), &logsoftc.sc_sigio));
245
246 /* This is deprecated, FIOGETOWN should be used instead */
247 case TIOCGPGRP:
248 *(int *)data = -fgetown(&logsoftc.sc_sigio);
249 break;
250
251 default:
252 return (ENOTTY);
253 }
254 return (0);
255}
256
257static void
258log_drvinit(void *unused)
259{
260
261 make_dev(&log_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "klog");
262}
263
264SYSINIT(logdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,log_drvinit,NULL)
| 155 l, uio);
156 if (error)
157 break;
158 mbp->msg_bufr += l;
159 if (mbp->msg_bufr >= mbp->msg_size)
160 mbp->msg_bufr = 0;
161 }
162 return (error);
163}
164
165/*ARGSUSED*/
166static int
167logpoll(dev_t dev, int events, struct thread *td)
168{
169 int s;
170 int revents = 0;
171
172 s = splhigh();
173
174 if (events & (POLLIN | POLLRDNORM)) {
175 if (msgbufp->msg_bufr != msgbufp->msg_bufx)
176 revents |= events & (POLLIN | POLLRDNORM);
177 else
178 selrecord(td, &logsoftc.sc_selp);
179 }
180 splx(s);
181 return (revents);
182}
183
184static void
185logtimeout(void *arg)
186{
187
188 if (!log_open)
189 return;
190 if (msgbuftrigger == 0) {
191 callout_reset(&logsoftc.sc_callout,
192 hz / log_wakeups_per_second, logtimeout, NULL);
193 return;
194 }
195 msgbuftrigger = 0;
196 selwakeup(&logsoftc.sc_selp);
197 if ((logsoftc.sc_state & LOG_ASYNC) && logsoftc.sc_sigio != NULL)
198 pgsigio(&logsoftc.sc_sigio, SIGIO, 0);
199 if (logsoftc.sc_state & LOG_RDWAIT) {
200 wakeup((caddr_t)msgbufp);
201 logsoftc.sc_state &= ~LOG_RDWAIT;
202 }
203 callout_reset(&logsoftc.sc_callout, hz / log_wakeups_per_second,
204 logtimeout, NULL);
205}
206
207/*ARGSUSED*/
208static int
209logioctl(dev_t dev, u_long com, caddr_t data, int flag, struct thread *td)
210{
211 int l, s;
212
213 switch (com) {
214
215 /* return number of characters immediately available */
216 case FIONREAD:
217 s = splhigh();
218 l = msgbufp->msg_bufx - msgbufp->msg_bufr;
219 splx(s);
220 if (l < 0)
221 l += msgbufp->msg_size;
222 *(int *)data = l;
223 break;
224
225 case FIONBIO:
226 break;
227
228 case FIOASYNC:
229 if (*(int *)data)
230 logsoftc.sc_state |= LOG_ASYNC;
231 else
232 logsoftc.sc_state &= ~LOG_ASYNC;
233 break;
234
235 case FIOSETOWN:
236 return (fsetown(*(int *)data, &logsoftc.sc_sigio));
237
238 case FIOGETOWN:
239 *(int *)data = fgetown(&logsoftc.sc_sigio);
240 break;
241
242 /* This is deprecated, FIOSETOWN should be used instead. */
243 case TIOCSPGRP:
244 return (fsetown(-(*(int *)data), &logsoftc.sc_sigio));
245
246 /* This is deprecated, FIOGETOWN should be used instead */
247 case TIOCGPGRP:
248 *(int *)data = -fgetown(&logsoftc.sc_sigio);
249 break;
250
251 default:
252 return (ENOTTY);
253 }
254 return (0);
255}
256
257static void
258log_drvinit(void *unused)
259{
260
261 make_dev(&log_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "klog");
262}
263
264SYSINIT(logdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,log_drvinit,NULL)
|