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freebsd/sys/kern/subr_prf.c
Julian Elischer 269fb9d764 Collect all the functioons concerned with rebooting into one place
also add the at_shutdown callout list, and change the one user of
the present (broken) method (the vn driver) to use the new scheme.
1996-08-19 20:07:07 +00:00

608 lines
13 KiB
C

/*-
* Copyright (c) 1986, 1988, 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)subr_prf.c 8.3 (Berkeley) 1/21/94
* $Id: subr_prf.c,v 1.37 1996/05/09 18:58:06 gpalmer Exp $
*/
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/msgbuf.h>
#include <sys/proc.h>
#include <sys/tty.h>
#include <sys/tprintf.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#include <machine/cons.h>
/*
* Note that stdarg.h and the ANSI style va_start macro is used for both
* ANSI and traditional C compilers.
*/
#include <machine/stdarg.h>
#define TOCONS 0x01
#define TOTTY 0x02
#define TOLOG 0x04
struct tty *constty; /* pointer to console "window" tty */
static void (*v_putc)(int) = cnputc; /* routine to putc on virtual console */
static void logpri __P((int level));
static void msglogchar(int c, void *dummyarg);
struct putchar_arg {int flags; struct tty *tty; };
static void putchar __P((int ch, void *arg));
static char *ksprintn __P((u_long num, int base, int *len));
static int consintr = 1; /* Ok to handle console interrupts? */
/*
* Warn that a system table is full.
*/
void
tablefull(tab)
const char *tab;
{
log(LOG_ERR, "%s: table is full\n", tab);
}
/*
* Uprintf prints to the controlling terminal for the current process.
* It may block if the tty queue is overfull. No message is printed if
* the queue does not clear in a reasonable time.
*/
void
uprintf(const char *fmt, ...)
{
struct proc *p = curproc;
va_list ap;
struct putchar_arg pca;
if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
va_start(ap, fmt);
pca.tty = p->p_session->s_ttyp;
pca.flags = TOTTY;
kvprintf(fmt, putchar, &pca, 10, ap);
va_end(ap);
}
}
tpr_t
tprintf_open(p)
register struct proc *p;
{
if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
SESSHOLD(p->p_session);
return ((tpr_t) p->p_session);
}
return ((tpr_t) NULL);
}
void
tprintf_close(sess)
tpr_t sess;
{
if (sess)
SESSRELE((struct session *) sess);
}
/*
* tprintf prints on the controlling terminal associated
* with the given session.
*/
void
tprintf(tpr_t tpr, const char *fmt, ...)
{
register struct session *sess = (struct session *)tpr;
struct tty *tp = NULL;
int flags = TOLOG;
va_list ap;
struct putchar_arg pca;
logpri(LOG_INFO);
if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) {
flags |= TOTTY;
tp = sess->s_ttyp;
}
va_start(ap, fmt);
pca.tty = tp;
pca.flags = flags;
kvprintf(fmt, putchar, &pca, 10, ap);
va_end(ap);
logwakeup();
}
/*
* Ttyprintf displays a message on a tty; it should be used only by
* the tty driver, or anything that knows the underlying tty will not
* be revoke(2)'d away. Other callers should use tprintf.
*/
void
ttyprintf(struct tty *tp, const char *fmt, ...)
{
va_list ap;
struct putchar_arg pca;
va_start(ap, fmt);
pca.tty = tp;
pca.flags = TOTTY;
kvprintf(fmt, putchar, &pca, 10, ap);
va_end(ap);
}
extern int log_open;
/*
* Log writes to the log buffer, and guarantees not to sleep (so can be
* called by interrupt routines). If there is no process reading the
* log yet, it writes to the console also.
*/
void
log(int level, const char *fmt, ...)
{
register int s;
va_list ap;
s = splhigh();
logpri(level);
va_start(ap, fmt);
kvprintf(fmt, msglogchar, NULL, 10, ap);
va_end(ap);
splx(s);
if (!log_open) {
struct putchar_arg pca;
va_start(ap, fmt);
pca.tty = NULL;
pca.flags = TOCONS;
kvprintf(fmt, putchar, &pca, 10, ap);
va_end(ap);
}
logwakeup();
}
static void
logpri(level)
int level;
{
register char *p;
msglogchar('<', NULL);
for (p = ksprintn((u_long)level, 10, NULL); *p;)
msglogchar(*p--, NULL);
msglogchar('>', NULL);
}
int
addlog(const char *fmt, ...)
{
register int s;
va_list ap;
int retval;
s = splhigh();
va_start(ap, fmt);
retval = kvprintf(fmt, msglogchar, NULL, 10, ap);
splx(s);
va_end(ap);
if (!log_open) {
struct putchar_arg pca;
va_start(ap, fmt);
pca.tty = NULL;
pca.flags = TOCONS;
kvprintf(fmt, putchar, &pca, 10, ap);
va_end(ap);
}
logwakeup();
return (retval);
}
int
printf(const char *fmt, ...)
{
va_list ap;
register int savintr;
struct putchar_arg pca;
int retval;
savintr = consintr; /* disable interrupts */
consintr = 0;
va_start(ap, fmt);
pca.tty = NULL;
pca.flags = TOCONS | TOLOG;
retval = kvprintf(fmt, putchar, &pca, 10, ap);
va_end(ap);
if (!panicstr)
logwakeup();
consintr = savintr; /* reenable interrupts */
return retval;
}
void
vprintf(const char *fmt, va_list ap)
{
register int savintr;
struct putchar_arg pca;
savintr = consintr; /* disable interrupts */
consintr = 0;
pca.tty = NULL;
pca.flags = TOCONS | TOLOG;
kvprintf(fmt, putchar, &pca, 10, ap);
if (!panicstr)
logwakeup();
consintr = savintr; /* reenable interrupts */
}
/*
* Print a character on console or users terminal. If destination is
* the console then the last MSGBUFS characters are saved in msgbuf for
* inspection later.
*/
static void
putchar(int c, void *arg)
{
struct putchar_arg *ap = (struct putchar_arg*) arg;
int flags = ap->flags;
struct tty *tp = ap->tty;
if (panicstr)
constty = NULL;
if ((flags & TOCONS) && tp == NULL && constty) {
tp = constty;
flags |= TOTTY;
}
if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 &&
(flags & TOCONS) && tp == constty)
constty = NULL;
if ((flags & TOLOG))
msglogchar(c, NULL);
if ((flags & TOCONS) && constty == NULL && c != '\0')
(*v_putc)(c);
}
/*
* Scaled down version of sprintf(3).
*/
int
sprintf(char *buf, const char *cfmt, ...)
{
int retval;
va_list ap;
va_start(ap, cfmt);
retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
buf[retval] = '\0';
va_end(ap);
return retval;
}
/*
* Put a number (base <= 16) in a buffer in reverse order; return an
* optional length and a pointer to the NULL terminated (preceded?)
* buffer.
*/
static char *
ksprintn(ul, base, lenp)
register u_long ul;
register int base, *lenp;
{ /* A long in base 8, plus NULL. */
static char buf[sizeof(long) * NBBY / 3 + 2];
register char *p;
p = buf;
do {
*++p = hex2ascii(ul % base);
} while (ul /= base);
if (lenp)
*lenp = p - buf;
return (p);
}
/*
* Scaled down version of printf(3).
*
* Two additional formats:
*
* The format %b is supported to decode error registers.
* Its usage is:
*
* printf("reg=%b\n", regval, "<base><arg>*");
*
* where <base> is the output base expressed as a control character, e.g.
* \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
* the first of which gives the bit number to be inspected (origin 1), and
* the next characters (up to a control character, i.e. a character <= 32),
* give the name of the register. Thus:
*
* kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
*
* would produce output:
*
* reg=3<BITTWO,BITONE>
*
* XXX: %D -- Hexdump, takes pointer and separator string:
* ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
* ("%*D", len, ptr, " " -> XX XX XX XX ...
*/
int
kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
{
#define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
char *p, *q, *d;
u_char *up;
int ch, n;
u_long ul;
int base, lflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
int dwidth;
char padc;
int retval = 0;
if (!func)
d = (char *) arg;
else
d = NULL;
if (fmt == NULL)
fmt = "(fmt null)\n";
if (radix < 2 || radix > 36)
radix = 10;
for (;;) {
padc = ' ';
width = 0;
while ((ch = *(u_char *)fmt++) != '%') {
if (ch == '\0')
return retval;
PCHAR(ch);
}
lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
sign = 0; dot = 0; dwidth = 0;
reswitch: switch (ch = *(u_char *)fmt++) {
case '.':
dot = 1;
goto reswitch;
case '#':
sharpflag = 1;
goto reswitch;
case '+':
sign = 1;
goto reswitch;
case '-':
ladjust = 1;
goto reswitch;
case '%':
PCHAR(ch);
break;
case '*':
if (!dot) {
width = va_arg(ap, int);
if (width < 0) {
ladjust = !ladjust;
width = -width;
}
} else {
dwidth = va_arg(ap, int);
}
goto reswitch;
case '0':
if (!dot) {
padc = '0';
goto reswitch;
}
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
for (n = 0;; ++fmt) {
n = n * 10 + ch - '0';
ch = *fmt;
if (ch < '0' || ch > '9')
break;
}
if (dot)
dwidth = n;
else
width = n;
goto reswitch;
case 'b':
ul = va_arg(ap, int);
p = va_arg(ap, char *);
for (q = ksprintn(ul, *p++, NULL); *q;)
PCHAR(*q--);
if (!ul)
break;
for (tmp = 0; *p;) {
n = *p++;
if (ul & (1 << (n - 1))) {
PCHAR(tmp ? ',' : '<');
for (; (n = *p) > ' '; ++p)
PCHAR(n);
tmp = 1;
} else
for (; *p > ' '; ++p)
continue;
}
if (tmp)
PCHAR('>');
break;
case 'c':
PCHAR(va_arg(ap, int));
break;
case 'D':
up = va_arg(ap, u_char *);
p = va_arg(ap, char *);
if (!width)
width = 16;
while(width--) {
PCHAR(hex2ascii(*up >> 4));
PCHAR(hex2ascii(*up & 0x0f));
up++;
if (width)
for (q=p;*q;q++)
PCHAR(*q);
}
break;
case 'd':
ul = lflag ? va_arg(ap, long) : va_arg(ap, int);
sign = 1;
base = 10;
goto number;
case 'l':
lflag = 1;
goto reswitch;
case 'n':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = radix;
goto number;
case 'o':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = 8;
goto number;
case 'p':
ul = (u_long)va_arg(ap, void *);
base = 16;
PCHAR('0');
PCHAR('x');
goto number;
case 's':
p = va_arg(ap, char *);
if (p == NULL)
p = "(null)";
if (!dot)
n = strlen (p);
else
for (n = 0; n < dwidth && p[n]; n++)
continue;
width -= n;
if (!ladjust && width > 0)
while (width--)
PCHAR(padc);
while (n--)
PCHAR(*p++);
if (ladjust && width > 0)
while (width--)
PCHAR(padc);
break;
case 'u':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = 10;
goto number;
case 'x':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = 16;
number: if (sign && (long)ul < 0L) {
neg = 1;
ul = -(long)ul;
}
p = ksprintn(ul, base, &tmp);
if (sharpflag && ul != 0) {
if (base == 8)
tmp++;
else if (base == 16)
tmp += 2;
}
if (neg)
tmp++;
if (!ladjust && width && (width -= tmp) > 0)
while (width--)
PCHAR(padc);
if (neg)
PCHAR('-');
if (sharpflag && ul != 0) {
if (base == 8) {
PCHAR('0');
} else if (base == 16) {
PCHAR('0');
PCHAR('x');
}
}
while (*p)
PCHAR(*p--);
if (ladjust && width && (width -= tmp) > 0)
while (width--)
PCHAR(padc);
break;
default:
PCHAR('%');
if (lflag)
PCHAR('l');
PCHAR(ch);
break;
}
}
#undef PCHAR
}
/*
* Put character in log buffer.
*/
static void
msglogchar(int c, void *dummyarg)
{
struct msgbuf *mbp;
if (c != '\0' && c != '\r' && c != 0177 && msgbufmapped) {
mbp = msgbufp;
if (mbp->msg_magic != MSG_MAGIC ||
mbp->msg_bufx >= MSG_BSIZE ||
mbp->msg_bufr >= MSG_BSIZE) {
bzero(mbp, sizeof(struct msgbuf));
mbp->msg_magic = MSG_MAGIC;
}
mbp->msg_bufc[mbp->msg_bufx++] = c;
if (mbp->msg_bufx >= MSG_BSIZE)
mbp->msg_bufx = 0;
/* If the buffer is full, keep the most recent data. */
if (mbp->msg_bufr == mbp->msg_bufx) {
if (++mbp->msg_bufr >= MSG_BSIZE)
mbp->msg_bufr = 0;
}
}
}