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subr_prf.c
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subr_prf.c
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/* $NetBSD: subr_prf.c,v 1.161 2017/10/27 09:59:16 utkarsh009 Exp $ */
/*-
* 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 8.4 (Berkeley) 5/4/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_prf.c,v 1.161 2017/10/27 09:59:16 utkarsh009 Exp $");
#ifdef _KERNEL_OPT
#include "opt_ddb.h"
#include "opt_ipkdb.h"
#include "opt_kgdb.h"
#include "opt_dump.h"
#include "opt_rnd_printf.h"
#endif
#include <sys/param.h>
#include <sys/stdint.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/reboot.h>
#include <sys/msgbuf.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/tty.h>
#include <sys/tprintf.h>
#include <sys/spldebug.h>
#include <sys/syslog.h>
#include <sys/kprintf.h>
#include <sys/atomic.h>
#include <sys/kernel.h>
#include <sys/cpu.h>
#include <sys/sha2.h>
#include <sys/rndsource.h>
#include <dev/cons.h>
#include <net/if.h>
#ifdef IPKDB
#include <ipkdb/ipkdb.h>
#endif
static kmutex_t kprintf_mtx;
static bool kprintf_inited = false;
#ifdef KGDB
#include <sys/kgdb.h>
#endif
#ifdef DDB
#include <ddb/ddbvar.h> /* db_panic */
#include <ddb/db_output.h> /* db_printf, db_putchar prototypes */
#endif
/*
* defines
*/
/*
* local prototypes
*/
static void putchar(int, int, struct tty *);
/*
* globals
*/
extern struct tty *constty; /* pointer to console "window" tty */
extern int log_open; /* subr_log: is /dev/klog open? */
extern krndsource_t rnd_printf_source;
const char *panicstr; /* arg to first call to panic (used as a flag
to indicate that panic has already been called). */
struct cpu_info *paniccpu; /* cpu that first paniced */
long panicstart, panicend; /* position in the msgbuf of the start and
end of the formatted panicstr. */
int doing_shutdown; /* set to indicate shutdown in progress */
#ifdef RND_PRINTF
static bool kprintf_inited_callout = false;
static SHA512_CTX kprnd_sha;
static uint8_t kprnd_accum[SHA512_DIGEST_LENGTH];
static int kprnd_added;
static struct callout kprnd_callout;
#endif
#ifndef DUMP_ON_PANIC
#define DUMP_ON_PANIC 1
#endif
int dumponpanic = DUMP_ON_PANIC;
/*
* v_putc: routine to putc on virtual console
*
* the v_putc pointer can be used to redirect the console cnputc elsewhere
* [e.g. to a "virtual console"].
*/
void (*v_putc)(int) = cnputc; /* start with cnputc (normal cons) */
void (*v_flush)(void) = cnflush; /* start with cnflush (normal cons) */
const char hexdigits[] = "0123456789abcdef";
const char HEXDIGITS[] = "0123456789ABCDEF";
/*
* functions
*/
#ifdef RND_PRINTF
static void kprintf_rnd_get(size_t bytes, void *priv)
{
if (kprnd_added) {
KASSERT(kprintf_inited);
if (mutex_tryenter(&kprintf_mtx)) {
SHA512_Final(kprnd_accum, &kprnd_sha);
rnd_add_data(&rnd_printf_source,
kprnd_accum, sizeof(kprnd_accum), 0);
kprnd_added = 0;
/* This, we must do, since we called _Final. */
SHA512_Init(&kprnd_sha);
/* This is optional but seems useful. */
SHA512_Update(&kprnd_sha, kprnd_accum,
sizeof(kprnd_accum));
mutex_exit(&kprintf_mtx);
}
}
}
static void kprintf_rnd_callout(void *arg)
{
kprintf_rnd_get(0, NULL);
callout_schedule(&kprnd_callout, hz);
}
#endif
/*
* Locking is inited fairly early in MI bootstrap. Before that
* prints are done unlocked. But that doesn't really matter,
* since nothing can preempt us before interrupts are enabled.
*/
void
kprintf_init(void)
{
KASSERT(!kprintf_inited && cold); /* not foolproof, but ... */
#ifdef RND_PRINTF
SHA512_Init(&kprnd_sha);
#endif
mutex_init(&kprintf_mtx, MUTEX_DEFAULT, IPL_HIGH);
kprintf_inited = true;
}
#ifdef RND_PRINTF
void
kprintf_init_callout(void)
{
KASSERT(!kprintf_inited_callout);
callout_init(&kprnd_callout, CALLOUT_MPSAFE);
callout_setfunc(&kprnd_callout, kprintf_rnd_callout, NULL);
callout_schedule(&kprnd_callout, hz);
kprintf_inited_callout = true;
}
#endif
void
kprintf_lock(void)
{
if (__predict_true(kprintf_inited))
mutex_enter(&kprintf_mtx);
}
void
kprintf_unlock(void)
{
if (__predict_true(kprintf_inited)) {
/* assert kprintf wasn't somehow inited while we were in */
KASSERT(mutex_owned(&kprintf_mtx));
mutex_exit(&kprintf_mtx);
}
}
/*
* twiddle: spin a little propellor on the console.
*/
void
twiddle(void)
{
static const char twiddle_chars[] = "|/-\\";
static int pos;
kprintf_lock();
putchar(twiddle_chars[pos++ & 3], TOCONS, NULL);
putchar('\b', TOCONS, NULL);
kprintf_unlock();
}
/*
* panic: handle an unresolvable fatal error
*
* prints "panic: <message>" and reboots. if called twice (i.e. recursive
* call) we avoid trying to dump and just reboot (to avoid recursive panics).
*/
void
panic(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vpanic(fmt, ap);
va_end(ap);
}
void
vpanic(const char *fmt, va_list ap)
{
CPU_INFO_ITERATOR cii;
struct cpu_info *ci, *oci;
int bootopt;
static char scratchstr[384]; /* stores panic message */
spldebug_stop();
if (lwp0.l_cpu && curlwp) {
/*
* Disable preemption. If already panicing on another CPU, sit
* here and spin until the system is rebooted. Allow the CPU that
* first paniced to panic again.
*/
kpreempt_disable();
ci = curcpu();
oci = atomic_cas_ptr((void *)&paniccpu, NULL, ci);
if (oci != NULL && oci != ci) {
/* Give interrupts a chance to try and prevent deadlock. */
for (;;) {
#ifndef _RUMPKERNEL /* XXXpooka: temporary build fix, see kern/40505 */
DELAY(10);
#endif /* _RUMPKERNEL */
}
}
/*
* Convert the current thread to a bound thread and prevent all
* CPUs from scheduling unbound jobs. Do so without taking any
* locks.
*/
curlwp->l_pflag |= LP_BOUND;
for (CPU_INFO_FOREACH(cii, ci)) {
ci->ci_schedstate.spc_flags |= SPCF_OFFLINE;
}
}
bootopt = RB_AUTOBOOT | RB_NOSYNC;
if (!doing_shutdown) {
if (dumponpanic)
bootopt |= RB_DUMP;
} else
printf("Skipping crash dump on recursive panic\n");
doing_shutdown = 1;
if (msgbufenabled && msgbufp->msg_magic == MSG_MAGIC)
panicstart = msgbufp->msg_bufx;
printf("panic: ");
if (panicstr == NULL) {
/* first time in panic - store fmt first for precaution */
panicstr = fmt;
vsnprintf(scratchstr, sizeof(scratchstr), fmt, ap);
printf("%s", scratchstr);
panicstr = scratchstr;
} else {
vprintf(fmt, ap);
}
printf("\n");
if (msgbufenabled && msgbufp->msg_magic == MSG_MAGIC)
panicend = msgbufp->msg_bufx;
#ifdef IPKDB
ipkdb_panic();
#endif
#ifdef KGDB
kgdb_panic();
#endif
#ifdef KADB
if (boothowto & RB_KDB)
kdbpanic();
#endif
#ifdef DDB
db_panic();
#endif
cpu_reboot(bootopt, NULL);
}
/*
* kernel logging functions: log, logpri, addlog
*/
/*
* log: write to the log buffer
*
* => will not sleep [so safe to call from interrupt]
* => will log to console if /dev/klog isn't open
*/
void
log(int level, const char *fmt, ...)
{
va_list ap;
kprintf_lock();
klogpri(level); /* log the level first */
va_start(ap, fmt);
kprintf(fmt, TOLOG, NULL, NULL, ap);
va_end(ap);
if (!log_open) {
va_start(ap, fmt);
kprintf(fmt, TOCONS, NULL, NULL, ap);
va_end(ap);
}
kprintf_unlock();
logwakeup(); /* wake up anyone waiting for log msgs */
}
/*
* vlog: write to the log buffer [already have va_list]
*/
void
vlog(int level, const char *fmt, va_list ap)
{
va_list cap;
va_copy(cap, ap);
kprintf_lock();
klogpri(level); /* log the level first */
kprintf(fmt, TOLOG, NULL, NULL, ap);
if (!log_open)
kprintf(fmt, TOCONS, NULL, NULL, cap);
kprintf_unlock();
va_end(cap);
logwakeup(); /* wake up anyone waiting for log msgs */
}
/*
* logpri: log the priority level to the klog
*/
void
logpri(int level)
{
kprintf_lock();
klogpri(level);
kprintf_unlock();
}
/*
* Note: we must be in the mutex here!
*/
void
klogpri(int level)
{
char *p;
char snbuf[KPRINTF_BUFSIZE];
putchar('<', TOLOG, NULL);
snprintf(snbuf, sizeof(snbuf), "%d", level);
for (p = snbuf ; *p ; p++)
putchar(*p, TOLOG, NULL);
putchar('>', TOLOG, NULL);
}
/*
* addlog: add info to previous log message
*/
void
addlog(const char *fmt, ...)
{
va_list ap;
kprintf_lock();
va_start(ap, fmt);
kprintf(fmt, TOLOG, NULL, NULL, ap);
va_end(ap);
if (!log_open) {
va_start(ap, fmt);
kprintf(fmt, TOCONS, NULL, NULL, ap);
va_end(ap);
}
kprintf_unlock();
logwakeup();
}
/*
* putchar: print a single character on console or user terminal.
*
* => if console, then the last MSGBUFS chars are saved in msgbuf
* for inspection later (e.g. dmesg/syslog)
* => we must already be in the mutex!
*/
static void
putchar(int c, int flags, struct tty *tp)
{
#ifdef RND_PRINTF
uint8_t rbuf[SHA512_BLOCK_LENGTH];
static int cursor;
#endif
if (panicstr)
constty = NULL;
if ((flags & TOCONS) && tp == NULL && constty) {
tp = constty;
flags |= TOTTY;
}
if ((flags & TOTTY) && tp &&
tputchar(c, flags, tp) < 0 &&
(flags & TOCONS) && tp == constty)
constty = NULL;
if ((flags & TOLOG) &&
c != '\0' && c != '\r' && c != 0177)
logputchar(c);
if ((flags & TOCONS) && constty == NULL && c != '\0')
(*v_putc)(c);
#ifdef DDB
if (flags & TODDB) {
db_putchar(c);
return;
}
#endif
#ifdef RND_PRINTF
if (__predict_true(kprintf_inited)) {
rbuf[cursor] = c;
if (cursor == sizeof(rbuf) - 1) {
SHA512_Update(&kprnd_sha, rbuf, sizeof(rbuf));
kprnd_added++;
cursor = 0;
} else {
cursor++;
}
}
#endif
}
/*
* tablefull: warn that a system table is full
*/
void
tablefull(const char *tab, const char *hint)
{
if (hint)
log(LOG_ERR, "%s: table is full - %s\n", tab, hint);
else
log(LOG_ERR, "%s: table is full\n", tab);
}
/*
* uprintf: print to the controlling tty of the current process
*
* => we may block if the tty queue is full
* => no message is printed if the queue doesn't clear in a reasonable
* time
*/
void
uprintf(const char *fmt, ...)
{
struct proc *p = curproc;
va_list ap;
/* mutex_enter(proc_lock); XXXSMP */
if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) {
/* No mutex needed; going to process TTY. */
va_start(ap, fmt);
kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap);
va_end(ap);
}
/* mutex_exit(proc_lock); XXXSMP */
}
void
uprintf_locked(const char *fmt, ...)
{
struct proc *p = curproc;
va_list ap;
if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) {
/* No mutex needed; going to process TTY. */
va_start(ap, fmt);
kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap);
va_end(ap);
}
}
/*
* tprintf functions: used to send messages to a specific process
*
* usage:
* get a tpr_t handle on a process "p" by using "tprintf_open(p)"
* use the handle when calling "tprintf"
* when done, do a "tprintf_close" to drop the handle
*/
/*
* tprintf_open: get a tprintf handle on a process "p"
*
* => returns NULL if process can't be printed to
*/
tpr_t
tprintf_open(struct proc *p)
{
tpr_t cookie;
cookie = NULL;
mutex_enter(proc_lock);
if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) {
proc_sesshold(p->p_session);
cookie = (tpr_t)p->p_session;
}
mutex_exit(proc_lock);
return cookie;
}
/*
* tprintf_close: dispose of a tprintf handle obtained with tprintf_open
*/
void
tprintf_close(tpr_t sess)
{
if (sess) {
mutex_enter(proc_lock);
/* Releases proc_lock. */
proc_sessrele((struct session *)sess);
}
}
/*
* tprintf: given tprintf handle to a process [obtained with tprintf_open],
* send a message to the controlling tty for that process.
*
* => also sends message to /dev/klog
*/
void
tprintf(tpr_t tpr, const char *fmt, ...)
{
struct session *sess = (struct session *)tpr;
struct tty *tp = NULL;
int flags = TOLOG;
va_list ap;
/* mutex_enter(proc_lock); XXXSMP */
if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) {
flags |= TOTTY;
tp = sess->s_ttyp;
}
kprintf_lock();
klogpri(LOG_INFO);
va_start(ap, fmt);
kprintf(fmt, flags, tp, NULL, ap);
va_end(ap);
kprintf_unlock();
/* mutex_exit(proc_lock); XXXSMP */
logwakeup();
}
/*
* ttyprintf: send a message to a specific tty
*
* => should be used only by tty driver or anything that knows the
* underlying tty will not be revoked(2)'d away. [otherwise,
* use tprintf]
*/
void
ttyprintf(struct tty *tp, const char *fmt, ...)
{
va_list ap;
/* No mutex needed; going to process TTY. */
va_start(ap, fmt);
kprintf(fmt, TOTTY, tp, NULL, ap);
va_end(ap);
}
#ifdef DDB
/*
* db_printf: printf for DDB (via db_putchar)
*/
void
db_printf(const char *fmt, ...)
{
va_list ap;
/* No mutex needed; DDB pauses all processors. */
va_start(ap, fmt);
kprintf(fmt, TODDB, NULL, NULL, ap);
va_end(ap);
if (db_tee_msgbuf) {
va_start(ap, fmt);
kprintf(fmt, TOLOG, NULL, NULL, ap);
va_end(ap);
}
}
void
db_vprintf(const char *fmt, va_list ap)
{
va_list cap;
va_copy(cap, ap);
/* No mutex needed; DDB pauses all processors. */
kprintf(fmt, TODDB, NULL, NULL, ap);
if (db_tee_msgbuf)
kprintf(fmt, TOLOG, NULL, NULL, cap);
va_end(cap);
}
#endif /* DDB */
static void
kprintf_internal(const char *fmt, int oflags, void *vp, char *sbuf, ...)
{
va_list ap;
va_start(ap, sbuf);
(void)kprintf(fmt, oflags, vp, sbuf, ap);
va_end(ap);
}
/*
* Device autoconfiguration printf routines. These change their
* behavior based on the AB_* flags in boothowto. If AB_SILENT
* is set, messages never go to the console (but they still always
* go to the log). AB_VERBOSE overrides AB_SILENT.
*/
/*
* aprint_normal: Send to console unless AB_QUIET. Always goes
* to the log.
*/
static void
aprint_normal_internal(const char *prefix, const char *fmt, va_list ap)
{
int flags = TOLOG;
if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 ||
(boothowto & AB_VERBOSE) != 0)
flags |= TOCONS;
kprintf_lock();
if (prefix)
kprintf_internal("%s: ", flags, NULL, NULL, prefix);
kprintf(fmt, flags, NULL, NULL, ap);
kprintf_unlock();
if (!panicstr)
logwakeup();
}
void
aprint_normal(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_normal_internal(NULL, fmt, ap);
va_end(ap);
}
void
aprint_normal_dev(device_t dv, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_normal_internal(device_xname(dv), fmt, ap);
va_end(ap);
}
void
aprint_normal_ifnet(struct ifnet *ifp, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_normal_internal(ifp->if_xname, fmt, ap);
va_end(ap);
}
/*
* aprint_error: Send to console unless AB_QUIET. Always goes
* to the log. Also counts the number of times called so other
* parts of the kernel can report the number of errors during a
* given phase of system startup.
*/
static int aprint_error_count;
int
aprint_get_error_count(void)
{
int count;
kprintf_lock();
count = aprint_error_count;
aprint_error_count = 0;
kprintf_unlock();
return (count);
}
static void
aprint_error_internal(const char *prefix, const char *fmt, va_list ap)
{
int flags = TOLOG;
if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 ||
(boothowto & AB_VERBOSE) != 0)
flags |= TOCONS;
kprintf_lock();
aprint_error_count++;
if (prefix)
kprintf_internal("%s: ", flags, NULL, NULL, prefix);
kprintf(fmt, flags, NULL, NULL, ap);
kprintf_unlock();
if (!panicstr)
logwakeup();
}
void
aprint_error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_error_internal(NULL, fmt, ap);
va_end(ap);
}
void
aprint_error_dev(device_t dv, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_error_internal(device_xname(dv), fmt, ap);
va_end(ap);
}
void
aprint_error_ifnet(struct ifnet *ifp, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_error_internal(ifp->if_xname, fmt, ap);
va_end(ap);
}
/*
* aprint_naive: Send to console only if AB_QUIET. Never goes
* to the log.
*/
static void
aprint_naive_internal(const char *prefix, const char *fmt, va_list ap)
{
if ((boothowto & (AB_QUIET|AB_SILENT|AB_VERBOSE)) != AB_QUIET)
return;
kprintf_lock();
if (prefix)
kprintf_internal("%s: ", TOCONS, NULL, NULL, prefix);
kprintf(fmt, TOCONS, NULL, NULL, ap);
kprintf_unlock();
}
void
aprint_naive(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_naive_internal(NULL, fmt, ap);
va_end(ap);
}
void
aprint_naive_dev(device_t dv, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_naive_internal(device_xname(dv), fmt, ap);
va_end(ap);
}
void
aprint_naive_ifnet(struct ifnet *ifp, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_naive_internal(ifp->if_xname, fmt, ap);
va_end(ap);
}
/*
* aprint_verbose: Send to console only if AB_VERBOSE. Always
* goes to the log.
*/
static void
aprint_verbose_internal(const char *prefix, const char *fmt, va_list ap)
{
int flags = TOLOG;
if (boothowto & AB_VERBOSE)
flags |= TOCONS;
kprintf_lock();
if (prefix)
kprintf_internal("%s: ", flags, NULL, NULL, prefix);
kprintf(fmt, flags, NULL, NULL, ap);
kprintf_unlock();
if (!panicstr)
logwakeup();
}
void
aprint_verbose(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_verbose_internal(NULL, fmt, ap);
va_end(ap);
}
void
aprint_verbose_dev(device_t dv, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_verbose_internal(device_xname(dv), fmt, ap);
va_end(ap);
}
void
aprint_verbose_ifnet(struct ifnet *ifp, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_verbose_internal(ifp->if_xname, fmt, ap);
va_end(ap);
}
/*
* aprint_debug: Send to console and log only if AB_DEBUG.
*/
static void
aprint_debug_internal(const char *prefix, const char *fmt, va_list ap)
{
if ((boothowto & AB_DEBUG) == 0)
return;
kprintf_lock();
if (prefix)
kprintf_internal("%s: ", TOCONS | TOLOG, NULL, NULL, prefix);
kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap);
kprintf_unlock();
}
void
aprint_debug(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_debug_internal(NULL, fmt, ap);
va_end(ap);
}
void
aprint_debug_dev(device_t dv, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_debug_internal(device_xname(dv), fmt, ap);
va_end(ap);
}
void
aprint_debug_ifnet(struct ifnet *ifp, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
aprint_debug_internal(ifp->if_xname, fmt, ap);
va_end(ap);
}
void
printf_tolog(const char *fmt, ...)
{
va_list ap;