usr/src/sys/kern/subr_prf.c

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)subr_prf.c  7.2 (Berkeley) %G%
 */

#include "param.h"
#include "systm.h"
#include "seg.h"
#include "buf.h"
#include "conf.h"
#include "reboot.h"
#include "vm.h"
#include "msgbuf.h"
#include "dir.h"
#include "user.h"
#include "proc.h"
#include "ioctl.h"
#include "tty.h"
#include "syslog.h"

#ifdef vax
#include "../vax/mtpr.h"
#endif

#define TOCONS  0x1
#define TOTTY   0x2
#define TOLOG   0x4

/*
 * In case console is off,
 * panicstr contains argument to last
 * call to panic.
 */
char    *panicstr;

extern  cnputc();                       /* standard console putc */
extern  struct tty cons;                /* standard console tty */
struct  tty *constty;                   /* pointer to console "window" tty */
int     (*v_console)() = cnputc;        /* routine to putc on virtual console */

/*
 * Scaled down version of C Library printf.
 * Used to print diagnostic information directly on console tty.
 * Since it is not interrupt driven, all system activities are
 * suspended.  Printf should not be used for chit-chat.
 *
 * One additional format: %b is supported to decode error registers.
 * 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
 *      printf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
 * would produce output:
 *      reg=3<BITTWO,BITONE>
 */
/*VARARGS1*/
printf(fmt, x1)
        char *fmt;
        unsigned x1;
{

        prf(fmt, &x1, TOCONS | TOLOG, (struct tty *)0);
        logwakeup();
}

/*
 * Uprintf prints to the current user's terminal.
 * It may block if the tty queue is overfull.
 * Should determine whether current terminal user is related
 * to this process.
 */
/*VARARGS1*/
uprintf(fmt, x1)
        char *fmt;
        unsigned x1;
{
#ifdef notdef
        register struct proc *p;
#endif
        register struct tty *tp;

        if ((tp = u.u_ttyp) == NULL)
                return;
#ifdef notdef
        if (tp->t_pgrp && (p = pfind(tp->t_pgrp)))
                if (p->p_uid != u.u_uid)        /* doesn't account for setuid */
                        return;
#endif
        (void)ttycheckoutq(tp, 1);
        prf(fmt, &x1, TOTTY, tp);
}

/*
 * tprintf prints on the specified terminal (console if none)
 * and logs the message.  It is designed for error messages from
 * single-open devices, and may be called from interrupt level
 * (does not sleep).
 */
/*VARARGS2*/
tprintf(tp, fmt, x1)
        register struct tty *tp;
        char *fmt;
        unsigned x1;
{
        int flags = TOTTY | TOLOG;

        logpri(LOG_INFO);
        if (tp == (struct tty *)NULL) {
                tp = constty;
                if (tp == (struct tty *)NULL)
                        tp = &cons;
        }
        if (ttycheckoutq(tp, 0) == 0)
                flags = TOLOG;
        prf(fmt, &x1, flags, tp);
        logwakeup();
}

/*
 * 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.
 */
/*VARARGS2*/
log(level, fmt, x1)
        char *fmt;
        unsigned x1;
{
        register s = splhigh();
        extern int log_open;

        logpri(level);
        prf(fmt, &x1, TOLOG, (struct tty *)0);
        splx(s);
        if (!log_open)
                prf(fmt, &x1, TOCONS, (struct tty *)0);
        logwakeup();
}

logpri(level)
        int level;
{

        putchar('<', TOLOG, (struct tty *)0);
        printn((u_long)level, 10, TOLOG, (struct tty *)0);
        putchar('>', TOLOG, (struct tty *)0);
}

prf(fmt, adx, flags, ttyp)
        register char *fmt;
        register u_int *adx;
        struct tty *ttyp;
{
        register int b, c, i;
        char *s;
        int any;

loop:
        while ((c = *fmt++) != '%') {
                if (c == '\0')
                        return;
                putchar(c, flags, ttyp);
        }
again:
        c = *fmt++;
        /* THIS CODE IS VAX DEPENDENT IN HANDLING %l? AND %c */
        switch (c) {

        case 'l':
                goto again;
        case 'x': case 'X':
                b = 16;
                goto number;
        case 'd': case 'D':
        case 'u':               /* what a joke */
                b = 10;
                goto number;
        case 'o': case 'O':
                b = 8;
number:
                printn((u_long)*adx, b, flags, ttyp);
                break;
        case 'c':
                b = *adx;
                for (i = 24; i >= 0; i -= 8)
                        if (c = (b >> i) & 0x7f)
                                putchar(c, flags, ttyp);
                break;
        case 'b':
                b = *adx++;
                s = (char *)*adx;
                printn((u_long)b, *s++, flags, ttyp);
                any = 0;
                if (b) {
                        while (i = *s++) {
                                if (b & (1 << (i-1))) {
                                        putchar(any? ',' : '<', flags, ttyp);
                                        any = 1;
                                        for (; (c = *s) > 32; s++)
                                                putchar(c, flags, ttyp);
                                } else
                                        for (; *s > 32; s++)
                                                ;
                        }
                        if (any)
                                putchar('>', flags, ttyp);
                }
                break;

        case 's':
                s = (char *)*adx;
                while (c = *s++)
                        putchar(c, flags, ttyp);
                break;

        case '%':
                putchar('%', flags, ttyp);
                break;
        }
        adx++;
        goto loop;
}

/*
 * Printn prints a number n in base b.
 * We don't use recursion to avoid deep kernel stacks.
 */
printn(n, b, flags, ttyp)
        u_long n;
        struct tty *ttyp;
{
        char prbuf[11];
        register char *cp;

        if (b == 10 && (int)n < 0) {
                putchar('-', flags, ttyp);
                n = (unsigned)(-(int)n);
        }
        cp = prbuf;
        do {
                *cp++ = "0123456789abcdef"[n%b];
                n /= b;
        } while (n);
        do
                putchar(*--cp, flags, ttyp);
        while (cp > prbuf);
}

/*
 * Panic is called on unresolvable fatal errors.
 * It prints "panic: mesg", and then reboots.
 * If we are called twice, then we avoid trying to
 * sync the disks as this often leads to recursive panics.
 */
panic(s)
        char *s;
{
        int bootopt = RB_AUTOBOOT;

        if (panicstr)
                bootopt |= RB_NOSYNC;
        else {
                panicstr = s;
        }
        printf("panic: %s\n", s);
        boot(RB_PANIC, bootopt);
}

/*
 * Warn that a system table is full.
 */
tablefull(tab)
        char *tab;
{

        log(LOG_ERR, "%s: table is full\n", tab);
}

/*
 * Hard error is the preface to plaintive error messages
 * about failing disk transfers.
 */
harderr(bp, cp)
        struct buf *bp;
        char *cp;
{

        printf("%s%d%c: hard error sn%d ", cp,
            minor(bp->b_dev) >> 3, 'a'+(minor(bp->b_dev)&07), bp->b_blkno);
}

/*
 * Print a character on console or users terminal.
 * If destination is console then the last MSGBUFS characters
 * are saved in msgbuf for inspection later.
 */
/*ARGSUSED*/
putchar(c, flags, tp)
        register int c;
        struct tty *tp;
{

        if ((flags & TOCONS) && panicstr == 0 && tp == 0 && constty) {
                tp = constty;
                flags |= TOTTY;
        }
        if (flags & TOTTY) {
                register s = spltty();

                if (tp && (tp->t_state & (TS_CARR_ON | TS_ISOPEN)) ==
                    (TS_CARR_ON | TS_ISOPEN)) {
                        if (c == '\n')
                                (void) ttyoutput('\r', tp);
                        (void) ttyoutput(c, tp);
                        ttstart(tp);
                        flags &= ~TOCONS;
                } else if ((flags & TOCONS) && tp == constty)
                        constty = 0;
                splx(s);
        }
        if ((flags & TOLOG) && c != '\0' && c != '\r' && c != 0177
#ifdef vax
            && mfpr(MAPEN)
#endif
            ) {
                if (msgbuf.msg_magic != MSG_MAGIC) {
                        register int i;

                        msgbuf.msg_magic = MSG_MAGIC;
                        msgbuf.msg_bufx = msgbuf.msg_bufr = 0;
                        for (i=0; i < MSG_BSIZE; i++)
                                msgbuf.msg_bufc[i] = 0;
                }
                msgbuf.msg_bufc[msgbuf.msg_bufx++] = c;
                if (msgbuf.msg_bufx < 0 || msgbuf.msg_bufx >= MSG_BSIZE)
                        msgbuf.msg_bufx = 0;
        }
        if ((flags & TOCONS) && c != '\0')
                (*v_console)(c);
}