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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1982, 1986 Regents of the University of California. | |
3 | * 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 7.11 (Berkeley) 3/17/91 | |
d6075007 NW |
34 | * |
35 | * PATCHES MAGIC LEVEL PATCH THAT GOT US HERE | |
36 | * -------------------- ----- ---------------------- | |
37 | * CURRENT PATCH LEVEL: 1 XXXXX | |
38 | * -------------------- ----- ---------------------- | |
39 | * | |
40 | * 16 Jun 93 Juha Nurmela select uses pids, not pointers | |
15637ed4 RG |
41 | */ |
42 | ||
43 | /* | |
44 | * Error log buffer for kernel printf's. | |
45 | */ | |
46 | ||
47 | #include "param.h" | |
dd18dc33 | 48 | #include "systm.h" |
15637ed4 RG |
49 | #include "proc.h" |
50 | #include "vnode.h" | |
51 | #include "ioctl.h" | |
52 | #include "msgbuf.h" | |
53 | #include "file.h" | |
54 | ||
55 | #define LOG_RDPRI (PZERO + 1) | |
56 | ||
57 | #define LOG_ASYNC 0x04 | |
58 | #define LOG_RDWAIT 0x08 | |
59 | ||
60 | struct logsoftc { | |
61 | int sc_state; /* see above for possibilities */ | |
d6075007 | 62 | pid_t sc_sel; /* pid of process waiting on select call 16 Jun 93 */ |
15637ed4 RG |
63 | int sc_pgid; /* process/group for async I/O */ |
64 | } logsoftc; | |
65 | ||
66 | int log_open; /* also used in log() */ | |
67 | ||
68 | /*ARGSUSED*/ | |
69 | logopen(dev, flags, mode, p) | |
70 | dev_t dev; | |
71 | int flags, mode; | |
72 | struct proc *p; | |
73 | { | |
74 | register struct msgbuf *mbp = msgbufp; | |
75 | ||
76 | if (log_open) | |
77 | return (EBUSY); | |
78 | log_open = 1; | |
79 | logsoftc.sc_pgid = p->p_pid; /* signal process only */ | |
80 | /* | |
81 | * Potential race here with putchar() but since putchar should be | |
82 | * called by autoconf, msg_magic should be initialized by the time | |
83 | * we get here. | |
84 | */ | |
85 | if (mbp->msg_magic != MSG_MAGIC) { | |
86 | register int i; | |
87 | ||
88 | mbp->msg_magic = MSG_MAGIC; | |
89 | mbp->msg_bufx = mbp->msg_bufr = 0; | |
90 | for (i=0; i < MSG_BSIZE; i++) | |
91 | mbp->msg_bufc[i] = 0; | |
92 | } | |
93 | return (0); | |
94 | } | |
95 | ||
96 | /*ARGSUSED*/ | |
97 | logclose(dev, flag) | |
98 | dev_t dev; | |
99 | { | |
100 | log_open = 0; | |
101 | logsoftc.sc_state = 0; | |
d6075007 | 102 | logsoftc.sc_sel = 0; /* 16 Jun 93 */ |
15637ed4 RG |
103 | } |
104 | ||
105 | /*ARGSUSED*/ | |
106 | logread(dev, uio, flag) | |
107 | dev_t dev; | |
108 | struct uio *uio; | |
109 | int flag; | |
110 | { | |
111 | register struct msgbuf *mbp = msgbufp; | |
112 | register long l; | |
113 | register int s; | |
114 | int error = 0; | |
115 | ||
116 | s = splhigh(); | |
117 | while (mbp->msg_bufr == mbp->msg_bufx) { | |
118 | if (flag & IO_NDELAY) { | |
119 | splx(s); | |
120 | return (EWOULDBLOCK); | |
121 | } | |
122 | logsoftc.sc_state |= LOG_RDWAIT; | |
123 | if (error = tsleep((caddr_t)mbp, LOG_RDPRI | PCATCH, | |
124 | "klog", 0)) { | |
125 | splx(s); | |
126 | return (error); | |
127 | } | |
128 | } | |
129 | splx(s); | |
130 | logsoftc.sc_state &= ~LOG_RDWAIT; | |
131 | ||
132 | while (uio->uio_resid > 0) { | |
133 | l = mbp->msg_bufx - mbp->msg_bufr; | |
134 | if (l < 0) | |
135 | l = MSG_BSIZE - mbp->msg_bufr; | |
136 | l = MIN(l, uio->uio_resid); | |
137 | if (l == 0) | |
138 | break; | |
139 | error = uiomove((caddr_t)&mbp->msg_bufc[mbp->msg_bufr], | |
140 | (int)l, uio); | |
141 | if (error) | |
142 | break; | |
143 | mbp->msg_bufr += l; | |
144 | if (mbp->msg_bufr < 0 || mbp->msg_bufr >= MSG_BSIZE) | |
145 | mbp->msg_bufr = 0; | |
146 | } | |
147 | return (error); | |
148 | } | |
149 | ||
150 | /*ARGSUSED*/ | |
151 | logselect(dev, rw, p) | |
152 | dev_t dev; | |
153 | int rw; | |
154 | struct proc *p; | |
155 | { | |
156 | int s = splhigh(); | |
157 | ||
158 | switch (rw) { | |
159 | ||
160 | case FREAD: | |
161 | if (msgbufp->msg_bufr != msgbufp->msg_bufx) { | |
162 | splx(s); | |
163 | return (1); | |
164 | } | |
d6075007 | 165 | logsoftc.sc_sel = p->p_pid; /* 16 Jun 93 */ |
15637ed4 RG |
166 | break; |
167 | } | |
168 | splx(s); | |
169 | return (0); | |
170 | } | |
171 | ||
172 | logwakeup() | |
173 | { | |
174 | struct proc *p; | |
175 | ||
176 | if (!log_open) | |
177 | return; | |
d6075007 NW |
178 | if (logsoftc.sc_sel) { /* 16 Jun 93 */ |
179 | selwakeup(logsoftc.sc_sel, 0); | |
180 | logsoftc.sc_sel = 0; | |
15637ed4 RG |
181 | } |
182 | if (logsoftc.sc_state & LOG_ASYNC) { | |
183 | if (logsoftc.sc_pgid < 0) | |
184 | gsignal(-logsoftc.sc_pgid, SIGIO); | |
185 | else if (p = pfind(logsoftc.sc_pgid)) | |
186 | psignal(p, SIGIO); | |
187 | } | |
188 | if (logsoftc.sc_state & LOG_RDWAIT) { | |
189 | wakeup((caddr_t)msgbufp); | |
190 | logsoftc.sc_state &= ~LOG_RDWAIT; | |
191 | } | |
192 | } | |
193 | ||
194 | /*ARGSUSED*/ | |
195 | logioctl(dev, com, data, flag) | |
196 | caddr_t data; | |
197 | { | |
198 | long l; | |
199 | int s; | |
200 | ||
201 | switch (com) { | |
202 | ||
203 | /* return number of characters immediately available */ | |
204 | case FIONREAD: | |
205 | s = splhigh(); | |
206 | l = msgbufp->msg_bufx - msgbufp->msg_bufr; | |
207 | splx(s); | |
208 | if (l < 0) | |
209 | l += MSG_BSIZE; | |
210 | *(off_t *)data = l; | |
211 | break; | |
212 | ||
213 | case FIONBIO: | |
214 | break; | |
215 | ||
216 | case FIOASYNC: | |
217 | if (*(int *)data) | |
218 | logsoftc.sc_state |= LOG_ASYNC; | |
219 | else | |
220 | logsoftc.sc_state &= ~LOG_ASYNC; | |
221 | break; | |
222 | ||
223 | case TIOCSPGRP: | |
224 | logsoftc.sc_pgid = *(int *)data; | |
225 | break; | |
226 | ||
227 | case TIOCGPGRP: | |
228 | *(int *)data = logsoftc.sc_pgid; | |
229 | break; | |
230 | ||
231 | default: | |
232 | return (-1); | |
233 | } | |
234 | return (0); | |
235 | } |