/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* Please see the License for the specific language governing rights and
* limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
#include <sys/kernel.h>
#include <kern/thread.h>
#include <sys/lock.h>
+#include <sys/signalvar.h>
+#include <sys/conf.h>
+#include <sys/sysctl.h>
+#include <kern/kalloc.h>
+
+/* XXX should be in a common header somewhere */
+extern void klogwakeup(void);
+extern void logwakeup(void);
#define LOG_RDPRI (PZERO + 1)
} logsoftc;
int log_open; /* also used in log() */
-struct msgbuf temp_msgbuf;
+char smsg_bufc[MSG_BSIZE]; /* static buffer */
+struct msgbuf temp_msgbuf = {0,MSG_BSIZE,0,0,smsg_bufc};
struct msgbuf *msgbufp;
static int _logentrypend = 0;
static int log_inited = 0;
-void bsd_log_lock(void);
-/* the following two are implemented in osfmk/kern/printf.c */
+/* the following are implemented in osfmk/kern/printf.c */
+extern void bsd_log_lock(void);
extern void bsd_log_unlock(void);
extern void bsd_log_init(void);
+/* XXX wants a linker set so these can be static */
+extern d_open_t logopen;
+extern d_close_t logclose;
+extern d_read_t logread;
+extern d_ioctl_t logioctl;
+extern d_select_t logselect;
+
/*
* Serialize log access. Note that the log can be written at interrupt level,
* so any log manipulations that can be done from, or affect, another processor
/*ARGSUSED*/
-logopen(dev, flags, mode, p)
- dev_t dev;
- int flags, mode;
- struct proc *p;
+int
+logopen(__unused dev_t dev, __unused int flags, __unused int mode, struct proc *p)
{
LOG_LOCK();
if (log_open) {
/*ARGSUSED*/
int
-logclose(dev, flag)
- dev_t dev;
+logclose(__unused dev_t dev, __unused int flag, __unused int devtype, __unused struct proc *p)
{
- int oldpri;
LOG_LOCK();
log_open = 0;
selwakeup(&logsoftc.sc_selp);
/*ARGSUSED*/
int
-logread(dev, uio, flag)
- dev_t dev;
- struct uio *uio;
- int flag;
+logread(__unused dev_t dev, struct uio *uio, int flag)
{
register long l;
- register int s;
int error = 0;
- char localbuff[MSG_BSIZE];
- int copybytes;
LOG_LOCK();
while (msgbufp->msg_bufr == msgbufp->msg_bufx) {
* if there are any new characters. If that doesn't do it
* then wait for 5 sec and reevaluate
*/
- if (error = tsleep((caddr_t)msgbufp, LOG_RDPRI | PCATCH,
- "klog", 5 * hz)) {
+ if ((error = tsleep((caddr_t)msgbufp, LOG_RDPRI | PCATCH,
+ "klog", 5 * hz)) != 0) {
/* if it times out; ignore */
if (error != EWOULDBLOCK)
return (error);
}
logsoftc.sc_state &= ~LOG_RDWAIT;
-
while (uio_resid(uio) > 0) {
l = msgbufp->msg_bufx - msgbufp->msg_bufr;
if (l < 0)
- l = MSG_BSIZE - msgbufp->msg_bufr;
+ l = msgbufp->msg_size - msgbufp->msg_bufr;
l = min(l, uio_resid(uio));
if (l == 0)
break;
- bcopy(&msgbufp->msg_bufc[msgbufp->msg_bufr], &localbuff[0], l);
LOG_UNLOCK();
- error = uiomove((caddr_t)&localbuff[0],
+ error = uiomove((caddr_t)&msgbufp->msg_bufc[msgbufp->msg_bufr],
(int)l, uio);
LOG_LOCK();
if (error)
break;
msgbufp->msg_bufr += l;
- if (msgbufp->msg_bufr < 0 || msgbufp->msg_bufr >= MSG_BSIZE)
+ if (msgbufp->msg_bufr < 0 || msgbufp->msg_bufr >= msgbufp->msg_size)
msgbufp->msg_bufr = 0;
}
out:
/*ARGSUSED*/
int
-logselect(dev, rw, wql, p)
- dev_t dev;
- int rw;
- void * wql;
- struct proc *p;
+logselect(__unused dev_t dev, int rw, void * wql, struct proc *p)
{
-
switch (rw) {
case FREAD:
}
void
-logwakeup()
+logwakeup(void)
{
- struct proc *p;
int pgid;
- boolean_t funnel_state;
LOG_LOCK();
if (!log_open) {
LOG_UNLOCK();
if (pgid < 0)
gsignal(-pgid, SIGIO);
- else if (p = pfind(pgid))
- psignal(p, SIGIO);
+ else
+ proc_signal(pgid, SIGIO);
LOG_LOCK();
}
if (logsoftc.sc_state & LOG_RDWAIT) {
}
void
-klogwakeup()
+klogwakeup(void)
{
-
if (_logentrypend) {
_logentrypend = 0;
logwakeup();
/*ARGSUSED*/
int
-logioctl(dev, com, data, flag)
- caddr_t data;
+logioctl(__unused dev_t dev, u_long com, caddr_t data, __unused int flag, __unused struct proc *p)
{
long l;
- int s;
- LOG_LOCK();
+ LOG_LOCK();
switch (com) {
/* return number of characters immediately available */
case FIONREAD:
l = msgbufp->msg_bufx - msgbufp->msg_bufr;
if (l < 0)
- l += MSG_BSIZE;
+ l += msgbufp->msg_size;
*(off_t *)data = l;
break;
}
void
-bsd_log_init()
+bsd_log_init(void)
{
if (!log_inited) {
msgbufp = &temp_msgbuf;
}
}
+
+/*
+ * log_putc_locked
+ *
+ * Decription: Output a character to the log; assumes the LOG_LOCK() is held
+ * by the caller.
+ *
+ * Parameters: c Character to output
+ *
+ * Returns: (void)
+ *
+ * Notes: This functions is used for multibyte output to the log; it
+ * should be used preferrentially where possible to ensure that
+ * log entries do not end up interspersed due to preemption or
+ * SMP reentrancy.
+ */
void
-log_putc(char c)
+log_putc_locked(char c)
{
register struct msgbuf *mbp;
if (!log_inited) {
panic("bsd log is not inited");
}
- LOG_LOCK();
mbp = msgbufp;
- if (mbp-> msg_magic != MSG_MAGIC) {
+ if (mbp-> msg_magic != MSG_MAGIC) {
register int i;
mbp->msg_magic = MSG_MAGIC;
}
mbp->msg_bufc[mbp->msg_bufx++] = c;
_logentrypend = 1;
- if (mbp->msg_bufx < 0 || mbp->msg_bufx >= MSG_BSIZE)
+ if (mbp->msg_bufx < 0 || mbp->msg_bufx >= msgbufp->msg_size)
mbp->msg_bufx = 0;
+}
+
+
+/*
+ * log_putc
+ *
+ * Decription: Output a character to the log; assumes the LOG_LOCK() is NOT
+ * held by the caller.
+ *
+ * Parameters: c Character to output
+ *
+ * Returns: (void)
+ *
+ * Notes: This function is used for syingle byte output to the log. It
+ * primarily exists to maintain binary backward compatibility.
+ */
+void
+log_putc(char c)
+{
+ if (!log_inited) {
+ panic("bsd log is not inited");
+ }
+ LOG_LOCK();
+ log_putc_locked(c);
LOG_UNLOCK();
}
+
+/*
+ * it is possible to increase the kernel log buffer size by adding
+ * msgbuf=n
+ * to the kernel command line, and to read the current size using
+ * sysctl kern.msgbuf
+ * If there is no parameter on the kernel command line, the buffer is
+ * allocated statically and is MSG_BSIZE characters in size, otherwise
+ * memory is dynamically allocated.
+ * This function may only be called once, during kernel initialization.
+ * Memory management must already be up. The buffer must not have
+ * overflown yet.
+ */
+void
+log_setsize(long size) {
+ char *new_logdata;
+ if (msgbufp->msg_size!=MSG_BSIZE) {
+ printf("log_setsize: attempt to change size more than once\n");
+ return;
+ }
+ if (size==MSG_BSIZE)
+ return;
+ if (size<MSG_BSIZE) { /* we don't support reducing the log size */
+ printf("log_setsize: can't decrease log size\n");
+ return;
+ }
+ if (!(new_logdata = (char*)kalloc(size))) {
+ printf("log_setsize: unable to allocate memory\n");
+ return;
+ }
+ LOG_LOCK();
+ bcopy(smsg_bufc, new_logdata, MSG_BSIZE);
+ bzero(new_logdata+MSG_BSIZE, size - MSG_BSIZE);
+ /* this memory is now dead - clear it so that it compresses better
+ in case of suspend to disk etc. */
+ bzero(smsg_bufc, MSG_BSIZE);
+ msgbufp->msg_size = size;
+ msgbufp->msg_bufc = new_logdata;
+ LOG_UNLOCK();
+ printf("set system log size to %ld bytes\n", msgbufp->msg_size);
+}
+
+SYSCTL_LONG(_kern, OID_AUTO, msgbuf, CTLFLAG_RD, &temp_msgbuf.msg_size, "");
+
+/*
+ * This should be called by single user mode /sbin/dmesg only.
+ * It returns as much data still in the buffer as possible.
+ */
+int
+log_dmesg(user_addr_t buffer, uint32_t buffersize, register_t * retval) {
+ unsigned long i;
+ int error = 0, newl, skip;
+ char *localbuff, *p, *copystart, ch;
+ long localbuff_size = msgbufp->msg_size+2, copysize;
+
+ if (!(localbuff = (char *)kalloc(localbuff_size))) {
+ printf("log_dmesg: unable to allocate memory\n");
+ return (ENOMEM);
+ }
+ /* in between here, the log could become bigger, but that's fine */
+ LOG_LOCK();
+
+ /*
+ * The message buffer is circular; start at the write pointer, and
+ * make one loop up to write pointer - 1.
+ */
+ p = msgbufp->msg_bufc + msgbufp->msg_bufx;
+ for (i = newl = skip = 0; p != msgbufp->msg_bufc + msgbufp->msg_bufx - 1; ++p) {
+ if (p >= msgbufp->msg_bufc + msgbufp->msg_size)
+ p = msgbufp->msg_bufc;
+ ch = *p;
+ /* Skip "\n<.*>" syslog sequences. */
+ if (skip) {
+ if (ch == '>')
+ newl = skip = 0;
+ continue;
+ }
+ if (newl && ch == '<') {
+ skip = 1;
+ continue;
+ }
+ if (ch == '\0')
+ continue;
+ newl = ch == '\n';
+ localbuff[i++] = ch;
+ }
+ if (!newl)
+ localbuff[i++] = '\n';
+ localbuff[i++] = 0;
+
+ if (buffersize >= i) {
+ copystart = localbuff;
+ copysize = i;
+ } else {
+ copystart = localbuff + i - buffersize;
+ copysize = buffersize;
+ }
+
+ LOG_UNLOCK();
+
+ error = copyout(copystart, buffer, copysize);
+ if (!error)
+ *retval = copysize;
+
+ kfree(localbuff, localbuff_size);
+ return (error);
+}
projects / apple / xnu.git / blobdiff