2 * Copyright (c) 1986, 1988, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
42 #include "opt_printf.h"
45 #include <sys/param.h>
47 #include <sys/systm.h>
50 #include <sys/mutex.h>
52 #include <sys/kernel.h>
53 #include <sys/msgbuf.h>
54 #include <sys/malloc.h>
57 #include <sys/stddef.h>
58 #include <sys/sysctl.h>
60 #include <sys/syslog.h>
64 #include <sys/ctype.h>
72 * Note that stdarg.h and the ANSI style va_start macro is used for both
73 * ANSI and traditional C compilers.
75 #include <machine/stdarg.h>
83 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
84 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
103 static void msglogchar(int c, int pri);
104 static void msglogstr(char *str, int pri, int filter_cr);
105 static void putchar(int ch, void *arg);
106 static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len, int upper);
107 static void snprintf_func(int ch, void *arg);
109 static int msgbufmapped; /* Set when safe to use msgbuf */
112 static int log_console_output = 1;
113 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RWTUN,
114 &log_console_output, 0, "Duplicate console output to the syslog");
117 * See the comment in log_console() below for more explanation of this.
119 static int log_console_add_linefeed;
120 SYSCTL_INT(_kern, OID_AUTO, log_console_add_linefeed, CTLFLAG_RWTUN,
121 &log_console_add_linefeed, 0, "log_console() adds extra newlines");
123 static int always_console_output;
124 SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RWTUN,
125 &always_console_output, 0, "Always output to console despite TIOCCONS");
128 * Warn that a system table is full.
131 tablefull(const char *tab)
134 log(LOG_ERR, "%s: table is full\n", tab);
138 * Uprintf prints to the controlling terminal for the current process.
141 uprintf(const char *fmt, ...)
144 struct putchar_arg pca;
150 if (TD_IS_IDLETHREAD(td))
153 sx_slock(&proctree_lock);
156 if ((p->p_flag & P_CONTROLT) == 0) {
158 sx_sunlock(&proctree_lock);
161 SESS_LOCK(p->p_session);
162 pca.tty = p->p_session->s_ttyp;
163 SESS_UNLOCK(p->p_session);
165 if (pca.tty == NULL) {
166 sx_sunlock(&proctree_lock);
173 sx_sunlock(&proctree_lock);
174 retval = kvprintf(fmt, putchar, &pca, 10, ap);
181 * tprintf and vtprintf print on the controlling terminal associated with the
182 * given session, possibly to the log as well.
185 tprintf(struct proc *p, int pri, const char *fmt, ...)
190 vtprintf(p, pri, fmt, ap);
195 vtprintf(struct proc *p, int pri, const char *fmt, va_list ap)
197 struct tty *tp = NULL;
199 struct putchar_arg pca;
200 struct session *sess = NULL;
202 sx_slock(&proctree_lock);
207 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
212 if (tp != NULL && tty_checkoutq(tp))
225 sx_sunlock(&proctree_lock);
226 kvprintf(fmt, putchar, &pca, 10, ap);
235 * Ttyprintf displays a message on a tty; it should be used only by
236 * the tty driver, or anything that knows the underlying tty will not
237 * be revoke(2)'d away. Other callers should use tprintf.
240 ttyprintf(struct tty *tp, const char *fmt, ...)
243 struct putchar_arg pca;
250 retval = kvprintf(fmt, putchar, &pca, 10, ap);
256 _vprintf(int level, int flags, const char *fmt, va_list ap)
258 struct putchar_arg pca;
260 #ifdef PRINTF_BUFR_SIZE
261 char bufr[PRINTF_BUFR_SIZE];
267 #ifdef PRINTF_BUFR_SIZE
269 pca.p_next = pca.p_bufr;
270 pca.n_bufr = sizeof(bufr);
271 pca.remain = sizeof(bufr);
274 /* Don't buffer console output. */
278 retval = kvprintf(fmt, putchar, &pca, 10, ap);
280 #ifdef PRINTF_BUFR_SIZE
281 /* Write any buffered console/log output: */
282 if (*pca.p_bufr != '\0') {
283 if (pca.flags & TOLOG)
284 msglogstr(pca.p_bufr, level, /*filter_cr*/1);
286 if (pca.flags & TOCONS)
295 * Log writes to the log buffer, and guarantees not to sleep (so can be
296 * called by interrupt routines). If there is no process reading the
297 * log yet, it writes to the console also.
300 log(int level, const char *fmt, ...)
305 (void)_vprintf(level, log_open ? TOLOG : TOCONS | TOLOG, fmt, ap);
311 #define CONSCHUNK 128
314 log_console(struct uio *uio)
320 if (!log_console_output)
323 pri = LOG_INFO | LOG_CONSOLE;
325 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
328 while (uio->uio_resid > 0) {
329 c = imin(uio->uio_resid, CONSCHUNK - 1);
330 error = uiomove(consbuffer, c, uio);
333 /* Make sure we're NUL-terminated */
334 consbuffer[c] = '\0';
335 if (consbuffer[c - 1] == '\n')
339 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
342 * The previous behavior in log_console() is preserved when
343 * log_console_add_linefeed is non-zero. For that behavior, if an
344 * individual console write came in that was not terminated with a
345 * line feed, it would add a line feed.
347 * This results in different data in the message buffer than
348 * appears on the system console (which doesn't add extra line feed
351 * A number of programs and rc scripts write a line feed, or a period
352 * and a line feed when they have completed their operation. On
353 * the console, this looks seamless, but when displayed with
354 * 'dmesg -a', you wind up with output that looks like this:
359 * On the console, it looks like this:
362 * We could add logic to detect that situation, or just not insert
363 * the extra newlines. Set the kern.log_console_add_linefeed
364 * sysctl/tunable variable to get the old behavior.
366 if (!nl && log_console_add_linefeed) {
367 consbuffer[0] = '\n';
368 consbuffer[1] = '\0';
369 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
373 free(consbuffer, M_TEMP);
378 printf(const char *fmt, ...)
384 retval = vprintf(fmt, ap);
391 vprintf(const char *fmt, va_list ap)
395 retval = _vprintf(-1, TOCONS | TOLOG, fmt, ap);
404 putbuf(int c, struct putchar_arg *ap)
406 /* Check if no console output buffer was provided. */
407 if (ap->p_bufr == NULL) {
408 /* Output direct to the console. */
409 if (ap->flags & TOCONS)
412 if (ap->flags & TOLOG)
413 msglogchar(c, ap->pri);
415 /* Buffer the character: */
419 /* Always leave the buffer zero terminated. */
422 /* Check if the buffer needs to be flushed. */
423 if (ap->remain == 2 || c == '\n') {
425 if (ap->flags & TOLOG)
426 msglogstr(ap->p_bufr, ap->pri, /*filter_cr*/1);
428 if (ap->flags & TOCONS) {
429 if ((panicstr == NULL) && (constty != NULL))
430 msgbuf_addstr(&consmsgbuf, -1,
431 ap->p_bufr, /*filter_cr*/ 0);
433 if ((constty == NULL) ||(always_console_output))
437 ap->p_next = ap->p_bufr;
438 ap->remain = ap->n_bufr;
443 * Since we fill the buffer up one character at a time,
444 * this should not happen. We should always catch it when
445 * ap->remain == 2 (if not sooner due to a newline), flush
446 * the buffer and move on. One way this could happen is
447 * if someone sets PRINTF_BUFR_SIZE to 1 or something
450 KASSERT(ap->remain > 2, ("Bad buffer logic, remain = %zd",
456 * Print a character on console or users terminal. If destination is
457 * the console then the last bunch of characters are saved in msgbuf for
461 putchar(int c, void *arg)
463 struct putchar_arg *ap = (struct putchar_arg*) arg;
464 struct tty *tp = ap->tty;
465 int flags = ap->flags;
467 /* Don't use the tty code after a panic or while in ddb. */
474 if ((flags & TOTTY) && tp != NULL && panicstr == NULL)
477 if ((flags & (TOCONS | TOLOG)) && c != '\0')
482 * Scaled down version of sprintf(3).
485 sprintf(char *buf, const char *cfmt, ...)
491 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
498 * Scaled down version of vsprintf(3).
501 vsprintf(char *buf, const char *cfmt, va_list ap)
505 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
511 * Scaled down version of snprintf(3).
514 snprintf(char *str, size_t size, const char *format, ...)
519 va_start(ap, format);
520 retval = vsnprintf(str, size, format, ap);
526 * Scaled down version of vsnprintf(3).
529 vsnprintf(char *str, size_t size, const char *format, va_list ap)
531 struct snprintf_arg info;
536 retval = kvprintf(format, snprintf_func, &info, 10, ap);
537 if (info.remain >= 1)
543 * Kernel version which takes radix argument vsnprintf(3).
546 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
548 struct snprintf_arg info;
553 retval = kvprintf(format, snprintf_func, &info, radix, ap);
554 if (info.remain >= 1)
560 snprintf_func(int ch, void *arg)
562 struct snprintf_arg *const info = arg;
564 if (info->remain >= 2) {
571 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
572 * order; return an optional length and a pointer to the last character
573 * written in the buffer (i.e., the first character of the string).
574 * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
577 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
584 c = hex2ascii(num % base);
585 *++p = upper ? toupper(c) : c;
586 } while (num /= base);
593 * Scaled down version of printf(3).
595 * Two additional formats:
597 * The format %b is supported to decode error registers.
600 * printf("reg=%b\n", regval, "<base><arg>*");
602 * where <base> is the output base expressed as a control character, e.g.
603 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
604 * the first of which gives the bit number to be inspected (origin 1), and
605 * the next characters (up to a control character, i.e. a character <= 32),
606 * give the name of the register. Thus:
608 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE");
610 * would produce output:
612 * reg=3<BITTWO,BITONE>
614 * XXX: %D -- Hexdump, takes pointer and separator string:
615 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
616 * ("%*D", len, ptr, " " -> XX XX XX XX ...
619 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
621 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
624 const char *p, *percent, *q;
628 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
629 int cflag, hflag, jflag, tflag, zflag;
632 int stop = 0, retval = 0;
641 fmt = "(fmt null)\n";
643 if (radix < 2 || radix > 36)
649 while ((ch = (u_char)*fmt++) != '%' || stop) {
655 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
656 sign = 0; dot = 0; dwidth = 0; upper = 0;
657 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
658 reswitch: switch (ch = (u_char)*fmt++) {
676 width = va_arg(ap, int);
682 dwidth = va_arg(ap, int);
690 case '1': case '2': case '3': case '4':
691 case '5': case '6': case '7': case '8': case '9':
692 for (n = 0;; ++fmt) {
693 n = n * 10 + ch - '0';
695 if (ch < '0' || ch > '9')
704 num = (u_int)va_arg(ap, int);
705 p = va_arg(ap, char *);
706 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
714 if (num & (1 << (n - 1))) {
715 PCHAR(tmp ? ',' : '<');
716 for (; (n = *p) > ' '; ++p)
720 for (; *p > ' '; ++p)
727 PCHAR(va_arg(ap, int));
730 up = va_arg(ap, u_char *);
731 p = va_arg(ap, char *);
735 PCHAR(hex2ascii(*up >> 4));
736 PCHAR(hex2ascii(*up & 0x0f));
767 *(va_arg(ap, intmax_t *)) = retval;
769 *(va_arg(ap, quad_t *)) = retval;
771 *(va_arg(ap, long *)) = retval;
773 *(va_arg(ap, size_t *)) = retval;
775 *(va_arg(ap, short *)) = retval;
777 *(va_arg(ap, char *)) = retval;
779 *(va_arg(ap, int *)) = retval;
786 sharpflag = (width == 0);
788 num = (uintptr_t)va_arg(ap, void *);
799 p = va_arg(ap, char *);
805 for (n = 0; n < dwidth && p[n]; n++)
810 if (!ladjust && width > 0)
815 if (ladjust && width > 0)
840 num = va_arg(ap, uintmax_t);
842 num = va_arg(ap, u_quad_t);
844 num = va_arg(ap, ptrdiff_t);
846 num = va_arg(ap, u_long);
848 num = va_arg(ap, size_t);
850 num = (u_short)va_arg(ap, int);
852 num = (u_char)va_arg(ap, int);
854 num = va_arg(ap, u_int);
858 num = va_arg(ap, intmax_t);
860 num = va_arg(ap, quad_t);
862 num = va_arg(ap, ptrdiff_t);
864 num = va_arg(ap, long);
866 num = va_arg(ap, ssize_t);
868 num = (short)va_arg(ap, int);
870 num = (char)va_arg(ap, int);
872 num = va_arg(ap, int);
874 if (sign && (intmax_t)num < 0) {
876 num = -(intmax_t)num;
878 p = ksprintn(nbuf, num, base, &n, upper);
880 if (sharpflag && num != 0) {
889 if (!ladjust && padc == '0')
890 dwidth = width - tmp;
891 width -= tmp + imax(dwidth, n);
898 if (sharpflag && num != 0) {
901 } else if (base == 16) {
918 while (percent < fmt)
921 * Since we ignore a formatting argument it is no
922 * longer safe to obey the remaining formatting
923 * arguments as the arguments will no longer match
934 * Put character in log buffer with a particular priority.
937 msglogchar(int c, int pri)
939 static int lastpri = -1;
946 if (c == '\0' || c == '\r')
948 if (pri != -1 && pri != lastpri) {
950 msgbuf_addchar(msgbufp, '\n');
953 msgbuf_addchar(msgbufp, '<');
954 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
955 msgbuf_addchar(msgbufp, *p--);
956 msgbuf_addchar(msgbufp, '>');
959 msgbuf_addchar(msgbufp, c);
969 msglogstr(char *str, int pri, int filter_cr)
974 msgbuf_addstr(msgbufp, pri, str, filter_cr);
978 msgbufinit(void *ptr, int size)
981 static struct msgbuf *oldp = NULL;
983 size -= sizeof(*msgbufp);
985 msgbufp = (struct msgbuf *)(cp + size);
986 msgbuf_reinit(msgbufp, cp, size);
987 if (msgbufmapped && oldp != msgbufp)
988 msgbuf_copy(oldp, msgbufp);
993 static int unprivileged_read_msgbuf = 1;
994 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
995 CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
996 "Unprivileged processes may read the kernel message buffer");
998 /* Sysctls for accessing/clearing the msgbuf */
1000 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
1006 if (!unprivileged_read_msgbuf) {
1007 error = priv_check(req->td, PRIV_MSGBUF);
1012 /* Read the whole buffer, one chunk at a time. */
1013 mtx_lock(&msgbuf_lock);
1014 msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
1016 len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq);
1017 mtx_unlock(&msgbuf_lock);
1019 return (SYSCTL_OUT(req, "", 1)); /* add nulterm */
1021 error = sysctl_handle_opaque(oidp, buf, len, req);
1025 mtx_lock(&msgbuf_lock);
1029 SYSCTL_PROC(_kern, OID_AUTO, msgbuf,
1030 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
1031 NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
1033 static int msgbuf_clearflag;
1036 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
1039 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
1040 if (!error && req->newptr) {
1041 mtx_lock(&msgbuf_lock);
1042 msgbuf_clear(msgbufp);
1043 mtx_unlock(&msgbuf_lock);
1044 msgbuf_clearflag = 0;
1049 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
1050 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE,
1051 &msgbuf_clearflag, 0, sysctl_kern_msgbuf_clear, "I",
1052 "Clear kernel message buffer");
1056 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
1060 if (!msgbufmapped) {
1061 db_printf("msgbuf not mapped yet\n");
1064 db_printf("msgbufp = %p\n", msgbufp);
1065 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
1066 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
1067 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
1068 for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) {
1069 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
1070 db_printf("%c", msgbufp->msg_ptr[j]);
1078 hexdump(const void *ptr, int length, const char *hdr, int flags)
1082 const unsigned char *cp;
1085 if ((flags & HD_DELIM_MASK) != 0)
1086 delim = (flags & HD_DELIM_MASK) >> 8;
1090 if ((flags & HD_COLUMN_MASK) != 0)
1091 cols = flags & HD_COLUMN_MASK;
1096 for (i = 0; i < length; i+= cols) {
1100 if ((flags & HD_OMIT_COUNT) == 0)
1103 if ((flags & HD_OMIT_HEX) == 0) {
1104 for (j = 0; j < cols; j++) {
1107 printf("%c%02x", delim, cp[k]);
1113 if ((flags & HD_OMIT_CHARS) == 0) {
1115 for (j = 0; j < cols; j++) {
1119 else if (cp[k] >= ' ' && cp[k] <= '~')
1120 printf("%c", cp[k]);
1129 #endif /* _KERNEL */
1132 sbuf_hexdump(struct sbuf *sb, const void *ptr, int length, const char *hdr,
1137 const unsigned char *cp;
1140 if ((flags & HD_DELIM_MASK) != 0)
1141 delim = (flags & HD_DELIM_MASK) >> 8;
1145 if ((flags & HD_COLUMN_MASK) != 0)
1146 cols = flags & HD_COLUMN_MASK;
1151 for (i = 0; i < length; i+= cols) {
1153 sbuf_printf(sb, "%s", hdr);
1155 if ((flags & HD_OMIT_COUNT) == 0)
1156 sbuf_printf(sb, "%04x ", i);
1158 if ((flags & HD_OMIT_HEX) == 0) {
1159 for (j = 0; j < cols; j++) {
1162 sbuf_printf(sb, "%c%02x", delim, cp[k]);
1164 sbuf_printf(sb, " ");
1168 if ((flags & HD_OMIT_CHARS) == 0) {
1169 sbuf_printf(sb, " |");
1170 for (j = 0; j < cols; j++) {
1173 sbuf_printf(sb, " ");
1174 else if (cp[k] >= ' ' && cp[k] <= '~')
1175 sbuf_printf(sb, "%c", cp[k]);
1177 sbuf_printf(sb, ".");
1179 sbuf_printf(sb, "|");
1181 sbuf_printf(sb, "\n");