freebsd-dev/sys/kern/subr_prf.c
Gleb Smirnoff c999e3481d dmesg: detect wrapped msgbuf on the kernel side and if so, skip first line
Since 59f256ec35 dmesg(8) will always skip first line of the message
buffer, cause it might be incomplete.  The problem is that in most cases
it is complete, valid and contains the "---<<BOOT>>---" marker.  This
skip can be disabled with '-a', but that would also unhide all non-kernel
messages.  Move this functionality from dmesg(8) to kernel, since kernel
actually knows if wrap has happened or not.

The main motivation for the change is not actually the value of the
"---<<BOOT>>---" marker.  The problem breaks unit tests, that clear
message buffer, perform a test and then check the message buffer for
a result.  Example of such test is sys/kern/sonewconn_overflow.
2022-02-05 13:35:31 -08:00

1335 lines
28 KiB
C

/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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. 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
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#ifdef _KERNEL
#include "opt_ddb.h"
#include "opt_printf.h"
#endif /* _KERNEL */
#include <sys/param.h>
#ifdef _KERNEL
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/kdb.h>
#include <sys/mutex.h>
#include <sys/sx.h>
#include <sys/kernel.h>
#include <sys/msgbuf.h>
#include <sys/malloc.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/stddef.h>
#include <sys/sysctl.h>
#include <sys/tty.h>
#include <sys/syslog.h>
#include <sys/cons.h>
#include <sys/uio.h>
#else /* !_KERNEL */
#include <errno.h>
#endif
#include <sys/ctype.h>
#include <sys/sbuf.h>
#ifdef DDB
#include <ddb/ddb.h>
#endif
/*
* Note that stdarg.h and the ANSI style va_start macro is used for both
* ANSI and traditional C compilers.
*/
#ifdef _KERNEL
#include <machine/stdarg.h>
#else
#include <stdarg.h>
#endif
/*
* This is needed for sbuf_putbuf() when compiled into userland. Due to the
* shared nature of this file, it's the only place to put it.
*/
#ifndef _KERNEL
#include <stdio.h>
#endif
#ifdef _KERNEL
#define TOCONS 0x01
#define TOTTY 0x02
#define TOLOG 0x04
/* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
#define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
struct putchar_arg {
int flags;
int pri;
struct tty *tty;
char *p_bufr;
size_t n_bufr;
char *p_next;
size_t remain;
};
struct snprintf_arg {
char *str;
size_t remain;
};
extern int log_open;
static void msglogchar(int c, int pri);
static void msglogstr(char *str, int pri, int filter_cr);
static void prf_putbuf(char *bufr, int flags, int pri);
static void putchar(int ch, void *arg);
static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len, int upper);
static void snprintf_func(int ch, void *arg);
static bool msgbufmapped; /* Set when safe to use msgbuf */
int msgbuftrigger;
struct msgbuf *msgbufp;
#ifndef BOOT_TAG_SZ
#define BOOT_TAG_SZ 32
#endif
#ifndef BOOT_TAG
/* Tag used to mark the start of a boot in dmesg */
#define BOOT_TAG "---<<BOOT>>---"
#endif
static char current_boot_tag[BOOT_TAG_SZ + 1] = BOOT_TAG;
SYSCTL_STRING(_kern, OID_AUTO, boot_tag, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
current_boot_tag, 0, "Tag added to dmesg at start of boot");
static int log_console_output = 1;
SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RWTUN,
&log_console_output, 0, "Duplicate console output to the syslog");
/*
* See the comment in log_console() below for more explanation of this.
*/
static int log_console_add_linefeed;
SYSCTL_INT(_kern, OID_AUTO, log_console_add_linefeed, CTLFLAG_RWTUN,
&log_console_add_linefeed, 0, "log_console() adds extra newlines");
static int always_console_output;
SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RWTUN,
&always_console_output, 0, "Always output to console despite TIOCCONS");
/*
* Warn that a system table is full.
*/
void
tablefull(const char *tab)
{
log(LOG_ERR, "%s: table is full\n", tab);
}
/*
* Uprintf prints to the controlling terminal for the current process.
*/
int
uprintf(const char *fmt, ...)
{
va_list ap;
struct putchar_arg pca;
struct proc *p;
struct thread *td;
int retval;
td = curthread;
if (TD_IS_IDLETHREAD(td))
return (0);
if (td->td_proc == initproc) {
/* Produce output when we fail to load /sbin/init: */
va_start(ap, fmt);
retval = vprintf(fmt, ap);
va_end(ap);
return (retval);
}
sx_slock(&proctree_lock);
p = td->td_proc;
PROC_LOCK(p);
if ((p->p_flag & P_CONTROLT) == 0) {
PROC_UNLOCK(p);
sx_sunlock(&proctree_lock);
return (0);
}
SESS_LOCK(p->p_session);
pca.tty = p->p_session->s_ttyp;
SESS_UNLOCK(p->p_session);
PROC_UNLOCK(p);
if (pca.tty == NULL) {
sx_sunlock(&proctree_lock);
return (0);
}
pca.flags = TOTTY;
pca.p_bufr = NULL;
va_start(ap, fmt);
tty_lock(pca.tty);
sx_sunlock(&proctree_lock);
retval = kvprintf(fmt, putchar, &pca, 10, ap);
tty_unlock(pca.tty);
va_end(ap);
return (retval);
}
/*
* tprintf and vtprintf print on the controlling terminal associated with the
* given session, possibly to the log as well.
*/
void
tprintf(struct proc *p, int pri, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vtprintf(p, pri, fmt, ap);
va_end(ap);
}
void
vtprintf(struct proc *p, int pri, const char *fmt, va_list ap)
{
struct tty *tp = NULL;
int flags = 0;
struct putchar_arg pca;
struct session *sess = NULL;
sx_slock(&proctree_lock);
if (pri != -1)
flags |= TOLOG;
if (p != NULL) {
PROC_LOCK(p);
if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
sess = p->p_session;
sess_hold(sess);
PROC_UNLOCK(p);
tp = sess->s_ttyp;
if (tp != NULL && tty_checkoutq(tp))
flags |= TOTTY;
else
tp = NULL;
} else
PROC_UNLOCK(p);
}
pca.pri = pri;
pca.tty = tp;
pca.flags = flags;
pca.p_bufr = NULL;
if (pca.tty != NULL)
tty_lock(pca.tty);
sx_sunlock(&proctree_lock);
kvprintf(fmt, putchar, &pca, 10, ap);
if (pca.tty != NULL)
tty_unlock(pca.tty);
if (sess != NULL)
sess_release(sess);
msgbuftrigger = 1;
}
static int
_vprintf(int level, int flags, const char *fmt, va_list ap)
{
struct putchar_arg pca;
int retval;
#ifdef PRINTF_BUFR_SIZE
char bufr[PRINTF_BUFR_SIZE];
#endif
TSENTER();
pca.tty = NULL;
pca.pri = level;
pca.flags = flags;
#ifdef PRINTF_BUFR_SIZE
pca.p_bufr = bufr;
pca.p_next = pca.p_bufr;
pca.n_bufr = sizeof(bufr);
pca.remain = sizeof(bufr);
*pca.p_next = '\0';
#else
/* Don't buffer console output. */
pca.p_bufr = NULL;
#endif
retval = kvprintf(fmt, putchar, &pca, 10, ap);
#ifdef PRINTF_BUFR_SIZE
/* Write any buffered console/log output: */
if (*pca.p_bufr != '\0')
prf_putbuf(pca.p_bufr, flags, level);
#endif
TSEXIT();
return (retval);
}
/*
* 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, ...)
{
va_list ap;
va_start(ap, fmt);
vlog(level, fmt, ap);
va_end(ap);
}
void
vlog(int level, const char *fmt, va_list ap)
{
(void)_vprintf(level, log_open ? TOLOG : TOCONS | TOLOG, fmt, ap);
msgbuftrigger = 1;
}
#define CONSCHUNK 128
void
log_console(struct uio *uio)
{
int c, error, nl;
char *consbuffer;
int pri;
if (!log_console_output)
return;
pri = LOG_INFO | LOG_CONSOLE;
uio = cloneuio(uio);
consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
nl = 0;
while (uio->uio_resid > 0) {
c = imin(uio->uio_resid, CONSCHUNK - 1);
error = uiomove(consbuffer, c, uio);
if (error != 0)
break;
/* Make sure we're NUL-terminated */
consbuffer[c] = '\0';
if (consbuffer[c - 1] == '\n')
nl = 1;
else
nl = 0;
msglogstr(consbuffer, pri, /*filter_cr*/ 1);
}
/*
* The previous behavior in log_console() is preserved when
* log_console_add_linefeed is non-zero. For that behavior, if an
* individual console write came in that was not terminated with a
* line feed, it would add a line feed.
*
* This results in different data in the message buffer than
* appears on the system console (which doesn't add extra line feed
* characters).
*
* A number of programs and rc scripts write a line feed, or a period
* and a line feed when they have completed their operation. On
* the console, this looks seamless, but when displayed with
* 'dmesg -a', you wind up with output that looks like this:
*
* Updating motd:
* .
*
* On the console, it looks like this:
* Updating motd:.
*
* We could add logic to detect that situation, or just not insert
* the extra newlines. Set the kern.log_console_add_linefeed
* sysctl/tunable variable to get the old behavior.
*/
if (!nl && log_console_add_linefeed) {
consbuffer[0] = '\n';
consbuffer[1] = '\0';
msglogstr(consbuffer, pri, /*filter_cr*/ 1);
}
msgbuftrigger = 1;
free(uio, M_IOV);
free(consbuffer, M_TEMP);
}
int
printf(const char *fmt, ...)
{
va_list ap;
int retval;
va_start(ap, fmt);
retval = vprintf(fmt, ap);
va_end(ap);
return (retval);
}
int
vprintf(const char *fmt, va_list ap)
{
int retval;
retval = _vprintf(-1, TOCONS | TOLOG, fmt, ap);
if (!KERNEL_PANICKED())
msgbuftrigger = 1;
return (retval);
}
static void
prf_putchar(int c, int flags, int pri)
{
if (flags & TOLOG)
msglogchar(c, pri);
if (flags & TOCONS) {
if ((!KERNEL_PANICKED()) && (constty != NULL))
msgbuf_addchar(&consmsgbuf, c);
if ((constty == NULL) || always_console_output)
cnputc(c);
}
}
static void
prf_putbuf(char *bufr, int flags, int pri)
{
if (flags & TOLOG)
msglogstr(bufr, pri, /*filter_cr*/1);
if (flags & TOCONS) {
if ((!KERNEL_PANICKED()) && (constty != NULL))
msgbuf_addstr(&consmsgbuf, -1,
bufr, /*filter_cr*/ 0);
if ((constty == NULL) || always_console_output)
cnputs(bufr);
}
}
static void
putbuf(int c, struct putchar_arg *ap)
{
/* Check if no console output buffer was provided. */
if (ap->p_bufr == NULL) {
prf_putchar(c, ap->flags, ap->pri);
} else {
/* Buffer the character: */
*ap->p_next++ = c;
ap->remain--;
/* Always leave the buffer zero terminated. */
*ap->p_next = '\0';
/* Check if the buffer needs to be flushed. */
if (ap->remain == 2 || c == '\n') {
prf_putbuf(ap->p_bufr, ap->flags, ap->pri);
ap->p_next = ap->p_bufr;
ap->remain = ap->n_bufr;
*ap->p_next = '\0';
}
/*
* Since we fill the buffer up one character at a time,
* this should not happen. We should always catch it when
* ap->remain == 2 (if not sooner due to a newline), flush
* the buffer and move on. One way this could happen is
* if someone sets PRINTF_BUFR_SIZE to 1 or something
* similarly silly.
*/
KASSERT(ap->remain > 2, ("Bad buffer logic, remain = %zd",
ap->remain));
}
}
/*
* Print a character on console or users terminal. If destination is
* the console then the last bunch of characters are saved in msgbuf for
* inspection later.
*/
static void
putchar(int c, void *arg)
{
struct putchar_arg *ap = (struct putchar_arg*) arg;
struct tty *tp = ap->tty;
int flags = ap->flags;
/* Don't use the tty code after a panic or while in ddb. */
if (kdb_active) {
if (c != '\0')
cnputc(c);
return;
}
if ((flags & TOTTY) && tp != NULL && !KERNEL_PANICKED())
tty_putchar(tp, c);
if ((flags & (TOCONS | TOLOG)) && c != '\0')
putbuf(c, ap);
}
/*
* 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);
}
/*
* Scaled down version of vsprintf(3).
*/
int
vsprintf(char *buf, const char *cfmt, va_list ap)
{
int retval;
retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
buf[retval] = '\0';
return (retval);
}
/*
* Scaled down version of snprintf(3).
*/
int
snprintf(char *str, size_t size, const char *format, ...)
{
int retval;
va_list ap;
va_start(ap, format);
retval = vsnprintf(str, size, format, ap);
va_end(ap);
return(retval);
}
/*
* Scaled down version of vsnprintf(3).
*/
int
vsnprintf(char *str, size_t size, const char *format, va_list ap)
{
struct snprintf_arg info;
int retval;
info.str = str;
info.remain = size;
retval = kvprintf(format, snprintf_func, &info, 10, ap);
if (info.remain >= 1)
*info.str++ = '\0';
return (retval);
}
/*
* Kernel version which takes radix argument vsnprintf(3).
*/
int
vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
{
struct snprintf_arg info;
int retval;
info.str = str;
info.remain = size;
retval = kvprintf(format, snprintf_func, &info, radix, ap);
if (info.remain >= 1)
*info.str++ = '\0';
return (retval);
}
static void
snprintf_func(int ch, void *arg)
{
struct snprintf_arg *const info = arg;
if (info->remain >= 2) {
*info->str++ = ch;
info->remain--;
}
}
/*
* Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
* order; return an optional length and a pointer to the last character
* written in the buffer (i.e., the first character of the string).
* The buffer pointed to by `nbuf' must have length >= MAXNBUF.
*/
static char *
ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
{
char *p, c;
p = nbuf;
*p = '\0';
do {
c = hex2ascii(num % base);
*++p = upper ? toupper(c) : c;
} while (num /= base);
if (lenp)
*lenp = p - nbuf;
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");
*
* 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 nbuf[MAXNBUF];
char *d;
const char *p, *percent, *q;
u_char *up;
int ch, n;
uintmax_t num;
int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
int cflag, hflag, jflag, tflag, zflag;
int bconv, dwidth, upper;
char padc;
int stop = 0, retval = 0;
num = 0;
q = NULL;
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++) != '%' || stop) {
if (ch == '\0')
return (retval);
PCHAR(ch);
}
percent = fmt - 1;
qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
sign = 0; dot = 0; bconv = 0; dwidth = 0; upper = 0;
cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 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;
}
/* FALLTHROUGH */
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':
ladjust = 1;
bconv = 1;
goto handle_nosign;
case 'c':
width -= 1;
if (!ladjust && width > 0)
while (width--)
PCHAR(padc);
PCHAR(va_arg(ap, int));
if (ladjust && width > 0)
while (width--)
PCHAR(padc);
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':
case 'i':
base = 10;
sign = 1;
goto handle_sign;
case 'h':
if (hflag) {
hflag = 0;
cflag = 1;
} else
hflag = 1;
goto reswitch;
case 'j':
jflag = 1;
goto reswitch;
case 'l':
if (lflag) {
lflag = 0;
qflag = 1;
} else
lflag = 1;
goto reswitch;
case 'n':
/*
* We do not support %n in kernel, but consume the
* argument.
*/
if (jflag)
(void)va_arg(ap, intmax_t *);
else if (qflag)
(void)va_arg(ap, quad_t *);
else if (lflag)
(void)va_arg(ap, long *);
else if (zflag)
(void)va_arg(ap, size_t *);
else if (hflag)
(void)va_arg(ap, short *);
else if (cflag)
(void)va_arg(ap, char *);
else
(void)va_arg(ap, int *);
break;
case 'o':
base = 8;
goto handle_nosign;
case 'p':
base = 16;
sharpflag = (width == 0);
sign = 0;
num = (uintptr_t)va_arg(ap, void *);
goto number;
case 'q':
qflag = 1;
goto reswitch;
case 'r':
base = radix;
if (sign)
goto handle_sign;
goto handle_nosign;
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 't':
tflag = 1;
goto reswitch;
case 'u':
base = 10;
goto handle_nosign;
case 'X':
upper = 1;
/* FALLTHROUGH */
case 'x':
base = 16;
goto handle_nosign;
case 'y':
base = 16;
sign = 1;
goto handle_sign;
case 'z':
zflag = 1;
goto reswitch;
handle_nosign:
sign = 0;
if (jflag)
num = va_arg(ap, uintmax_t);
else if (qflag)
num = va_arg(ap, u_quad_t);
else if (tflag)
num = va_arg(ap, ptrdiff_t);
else if (lflag)
num = va_arg(ap, u_long);
else if (zflag)
num = va_arg(ap, size_t);
else if (hflag)
num = (u_short)va_arg(ap, int);
else if (cflag)
num = (u_char)va_arg(ap, int);
else
num = va_arg(ap, u_int);
if (bconv) {
q = va_arg(ap, char *);
base = *q++;
}
goto number;
handle_sign:
if (jflag)
num = va_arg(ap, intmax_t);
else if (qflag)
num = va_arg(ap, quad_t);
else if (tflag)
num = va_arg(ap, ptrdiff_t);
else if (lflag)
num = va_arg(ap, long);
else if (zflag)
num = va_arg(ap, ssize_t);
else if (hflag)
num = (short)va_arg(ap, int);
else if (cflag)
num = (char)va_arg(ap, int);
else
num = va_arg(ap, int);
number:
if (sign && (intmax_t)num < 0) {
neg = 1;
num = -(intmax_t)num;
}
p = ksprintn(nbuf, num, base, &n, upper);
tmp = 0;
if (sharpflag && num != 0) {
if (base == 8)
tmp++;
else if (base == 16)
tmp += 2;
}
if (neg)
tmp++;
if (!ladjust && padc == '0')
dwidth = width - tmp;
width -= tmp + imax(dwidth, n);
dwidth -= n;
if (!ladjust)
while (width-- > 0)
PCHAR(' ');
if (neg)
PCHAR('-');
if (sharpflag && num != 0) {
if (base == 8) {
PCHAR('0');
} else if (base == 16) {
PCHAR('0');
PCHAR('x');
}
}
while (dwidth-- > 0)
PCHAR('0');
while (*p)
PCHAR(*p--);
if (bconv && num != 0) {
/* %b conversion flag format. */
tmp = retval;
while (*q) {
n = *q++;
if (num & (1 << (n - 1))) {
PCHAR(retval != tmp ?
',' : '<');
for (; (n = *q) > ' '; ++q)
PCHAR(n);
} else
for (; *q > ' '; ++q)
continue;
}
if (retval != tmp) {
PCHAR('>');
width -= retval - tmp;
}
}
if (ladjust)
while (width-- > 0)
PCHAR(' ');
break;
default:
while (percent < fmt)
PCHAR(*percent++);
/*
* Since we ignore a formatting argument it is no
* longer safe to obey the remaining formatting
* arguments as the arguments will no longer match
* the format specs.
*/
stop = 1;
break;
}
}
#undef PCHAR
}
/*
* Put character in log buffer with a particular priority.
*/
static void
msglogchar(int c, int pri)
{
static int lastpri = -1;
static int dangling;
char nbuf[MAXNBUF];
char *p;
if (!msgbufmapped)
return;
if (c == '\0' || c == '\r')
return;
if (pri != -1 && pri != lastpri) {
if (dangling) {
msgbuf_addchar(msgbufp, '\n');
dangling = 0;
}
msgbuf_addchar(msgbufp, '<');
for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
msgbuf_addchar(msgbufp, *p--);
msgbuf_addchar(msgbufp, '>');
lastpri = pri;
}
msgbuf_addchar(msgbufp, c);
if (c == '\n') {
dangling = 0;
lastpri = -1;
} else {
dangling = 1;
}
}
static void
msglogstr(char *str, int pri, int filter_cr)
{
if (!msgbufmapped)
return;
msgbuf_addstr(msgbufp, pri, str, filter_cr);
}
void
msgbufinit(void *ptr, int size)
{
char *cp;
static struct msgbuf *oldp = NULL;
bool print_boot_tag;
size -= sizeof(*msgbufp);
cp = (char *)ptr;
print_boot_tag = !msgbufmapped;
/* Attempt to fetch kern.boot_tag tunable on first mapping */
if (!msgbufmapped)
TUNABLE_STR_FETCH("kern.boot_tag", current_boot_tag,
sizeof(current_boot_tag));
msgbufp = (struct msgbuf *)(cp + size);
msgbuf_reinit(msgbufp, cp, size);
if (msgbufmapped && oldp != msgbufp)
msgbuf_copy(oldp, msgbufp);
msgbufmapped = true;
if (print_boot_tag && *current_boot_tag != '\0')
printf("%s\n", current_boot_tag);
oldp = msgbufp;
}
/* Sysctls for accessing/clearing the msgbuf */
static int
sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
{
char buf[128], *bp;
u_int seq;
int error, len;
bool wrap;
error = priv_check(req->td, PRIV_MSGBUF);
if (error)
return (error);
/* Read the whole buffer, one chunk at a time. */
mtx_lock(&msgbuf_lock);
msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
wrap = (seq != 0);
for (;;) {
len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq);
mtx_unlock(&msgbuf_lock);
if (len == 0)
return (SYSCTL_OUT(req, "", 1)); /* add nulterm */
if (wrap) {
/* Skip the first line, as it is probably incomplete. */
bp = memchr(buf, '\n', len);
if (bp == NULL) {
mtx_lock(&msgbuf_lock);
continue;
}
wrap = false;
bp++;
len -= bp - buf;
if (len == 0) {
mtx_lock(&msgbuf_lock);
continue;
}
} else
bp = buf;
error = sysctl_handle_opaque(oidp, bp, len, req);
if (error)
return (error);
mtx_lock(&msgbuf_lock);
}
}
SYSCTL_PROC(_kern, OID_AUTO, msgbuf,
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
static int msgbuf_clearflag;
static int
sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
{
int error;
error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
if (!error && req->newptr) {
mtx_lock(&msgbuf_lock);
msgbuf_clear(msgbufp);
mtx_unlock(&msgbuf_lock);
msgbuf_clearflag = 0;
}
return (error);
}
SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE,
&msgbuf_clearflag, 0, sysctl_kern_msgbuf_clear, "I",
"Clear kernel message buffer");
#ifdef DDB
DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
{
int i, j;
if (!msgbufmapped) {
db_printf("msgbuf not mapped yet\n");
return;
}
db_printf("msgbufp = %p\n", msgbufp);
db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) {
j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
db_printf("%c", msgbufp->msg_ptr[j]);
}
db_printf("\n");
}
#endif /* DDB */
void
hexdump(const void *ptr, int length, const char *hdr, int flags)
{
int i, j, k;
int cols;
const unsigned char *cp;
char delim;
if ((flags & HD_DELIM_MASK) != 0)
delim = (flags & HD_DELIM_MASK) >> 8;
else
delim = ' ';
if ((flags & HD_COLUMN_MASK) != 0)
cols = flags & HD_COLUMN_MASK;
else
cols = 16;
cp = ptr;
for (i = 0; i < length; i+= cols) {
if (hdr != NULL)
printf("%s", hdr);
if ((flags & HD_OMIT_COUNT) == 0)
printf("%04x ", i);
if ((flags & HD_OMIT_HEX) == 0) {
for (j = 0; j < cols; j++) {
k = i + j;
if (k < length)
printf("%c%02x", delim, cp[k]);
else
printf(" ");
}
}
if ((flags & HD_OMIT_CHARS) == 0) {
printf(" |");
for (j = 0; j < cols; j++) {
k = i + j;
if (k >= length)
printf(" ");
else if (cp[k] >= ' ' && cp[k] <= '~')
printf("%c", cp[k]);
else
printf(".");
}
printf("|");
}
printf("\n");
}
}
#endif /* _KERNEL */
void
sbuf_hexdump(struct sbuf *sb, const void *ptr, int length, const char *hdr,
int flags)
{
int i, j, k;
int cols;
const unsigned char *cp;
char delim;
if ((flags & HD_DELIM_MASK) != 0)
delim = (flags & HD_DELIM_MASK) >> 8;
else
delim = ' ';
if ((flags & HD_COLUMN_MASK) != 0)
cols = flags & HD_COLUMN_MASK;
else
cols = 16;
cp = ptr;
for (i = 0; i < length; i+= cols) {
if (hdr != NULL)
sbuf_printf(sb, "%s", hdr);
if ((flags & HD_OMIT_COUNT) == 0)
sbuf_printf(sb, "%04x ", i);
if ((flags & HD_OMIT_HEX) == 0) {
for (j = 0; j < cols; j++) {
k = i + j;
if (k < length)
sbuf_printf(sb, "%c%02x", delim, cp[k]);
else
sbuf_printf(sb, " ");
}
}
if ((flags & HD_OMIT_CHARS) == 0) {
sbuf_printf(sb, " |");
for (j = 0; j < cols; j++) {
k = i + j;
if (k >= length)
sbuf_printf(sb, " ");
else if (cp[k] >= ' ' && cp[k] <= '~')
sbuf_printf(sb, "%c", cp[k]);
else
sbuf_printf(sb, ".");
}
sbuf_printf(sb, "|");
}
sbuf_printf(sb, "\n");
}
}
#ifdef _KERNEL
void
counted_warning(unsigned *counter, const char *msg)
{
struct thread *td;
unsigned c;
for (;;) {
c = *counter;
if (c == 0)
break;
if (atomic_cmpset_int(counter, c, c - 1)) {
td = curthread;
log(LOG_INFO, "pid %d (%s) %s%s\n",
td->td_proc->p_pid, td->td_name, msg,
c > 1 ? "" : " - not logging anymore");
break;
}
}
}
#endif
#ifdef _KERNEL
void
sbuf_putbuf(struct sbuf *sb)
{
prf_putbuf(sbuf_data(sb), TOLOG | TOCONS, -1);
}
#else
void
sbuf_putbuf(struct sbuf *sb)
{
printf("%s", sbuf_data(sb));
}
#endif
int
sbuf_printf_drain(void *arg, const char *data, int len)
{
size_t *retvalptr;
int r;
#ifdef _KERNEL
char *dataptr;
char oldchr;
/*
* This is allowed as an extra byte is always resvered for
* terminating NUL byte. Save and restore the byte because
* we might be flushing a record, and there may be valid
* data after the buffer.
*/
oldchr = data[len];
dataptr = __DECONST(char *, data);
dataptr[len] = '\0';
prf_putbuf(dataptr, TOLOG | TOCONS, -1);
r = len;
dataptr[len] = oldchr;
#else /* !_KERNEL */
r = printf("%.*s", len, data);
if (r < 0)
return (-errno);
#endif
retvalptr = arg;
if (retvalptr != NULL)
*retvalptr += r;
return (r);
}