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("$FreeBSD$");
41 #include "opt_printf.h"
43 #include <sys/param.h>
44 #include <sys/systm.h>
47 #include <sys/mutex.h>
49 #include <sys/kernel.h>
50 #include <sys/msgbuf.h>
51 #include <sys/malloc.h>
54 #include <sys/stddef.h>
55 #include <sys/sysctl.h>
57 #include <sys/syslog.h>
60 #include <sys/ctype.h>
67 * Note that stdarg.h and the ANSI style va_start macro is used for both
68 * ANSI and traditional C compilers.
70 #include <machine/stdarg.h>
76 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
77 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
96 static void msglogchar(int c, int pri);
97 static void msglogstr(char *str, int pri, int filter_cr);
98 static void putchar(int ch, void *arg);
99 static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len, int upper);
100 static void snprintf_func(int ch, void *arg);
102 static int msgbufmapped; /* Set when safe to use msgbuf */
105 static int log_console_output = 1;
106 TUNABLE_INT("kern.log_console_output", &log_console_output);
107 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW,
108 &log_console_output, 0, "Duplicate console output to the syslog.");
111 * See the comment in log_console() below for more explanation of this.
113 static int log_console_add_linefeed = 0;
114 TUNABLE_INT("kern.log_console_add_linefeed", &log_console_add_linefeed);
115 SYSCTL_INT(_kern, OID_AUTO, log_console_add_linefeed, CTLFLAG_RW,
116 &log_console_add_linefeed, 0, "log_console() adds extra newlines.");
118 static int always_console_output = 0;
119 TUNABLE_INT("kern.always_console_output", &always_console_output);
120 SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RW,
121 &always_console_output, 0, "Always output to console despite TIOCCONS.");
124 * Warn that a system table is full.
127 tablefull(const char *tab)
130 log(LOG_ERR, "%s: table is full\n", tab);
134 * Uprintf prints to the controlling terminal for the current process.
137 uprintf(const char *fmt, ...)
140 struct putchar_arg pca;
146 if (TD_IS_IDLETHREAD(td))
149 sx_slock(&proctree_lock);
152 if ((p->p_flag & P_CONTROLT) == 0) {
154 sx_sunlock(&proctree_lock);
157 SESS_LOCK(p->p_session);
158 pca.tty = p->p_session->s_ttyp;
159 SESS_UNLOCK(p->p_session);
161 if (pca.tty == NULL) {
162 sx_sunlock(&proctree_lock);
169 sx_sunlock(&proctree_lock);
170 retval = kvprintf(fmt, putchar, &pca, 10, ap);
177 * tprintf prints on the controlling terminal associated with the given
178 * session, possibly to the log as well.
181 tprintf(struct proc *p, int pri, const char *fmt, ...)
183 struct tty *tp = NULL;
186 struct putchar_arg pca;
187 struct session *sess = NULL;
189 sx_slock(&proctree_lock);
194 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
199 if (tp != NULL && tty_checkoutq(tp))
213 sx_sunlock(&proctree_lock);
214 kvprintf(fmt, putchar, &pca, 10, ap);
224 * Ttyprintf displays a message on a tty; it should be used only by
225 * the tty driver, or anything that knows the underlying tty will not
226 * be revoke(2)'d away. Other callers should use tprintf.
229 ttyprintf(struct tty *tp, const char *fmt, ...)
232 struct putchar_arg pca;
239 retval = kvprintf(fmt, putchar, &pca, 10, ap);
245 * Log writes to the log buffer, and guarantees not to sleep (so can be
246 * called by interrupt routines). If there is no process reading the
247 * log yet, it writes to the console also.
250 log(int level, const char *fmt, ...)
253 struct putchar_arg pca;
254 #ifdef PRINTF_BUFR_SIZE
255 char bufr[PRINTF_BUFR_SIZE];
260 pca.flags = log_open ? TOLOG : TOCONS;
261 #ifdef PRINTF_BUFR_SIZE
263 pca.p_next = pca.p_bufr;
264 pca.n_bufr = sizeof(bufr);
265 pca.remain = sizeof(bufr);
272 kvprintf(fmt, putchar, &pca, 10, ap);
275 #ifdef PRINTF_BUFR_SIZE
276 /* Write any buffered console/log output: */
277 if (*pca.p_bufr != '\0') {
278 if (pca.flags & TOLOG)
279 msglogstr(pca.p_bufr, level, /*filter_cr*/1);
281 if (pca.flags & TOCONS)
288 #define CONSCHUNK 128
291 log_console(struct uio *uio)
297 if (!log_console_output)
300 pri = LOG_INFO | LOG_CONSOLE;
302 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
305 while (uio->uio_resid > 0) {
306 c = imin(uio->uio_resid, CONSCHUNK - 1);
307 error = uiomove(consbuffer, c, uio);
310 /* Make sure we're NUL-terminated */
311 consbuffer[c] = '\0';
312 if (consbuffer[c - 1] == '\n')
316 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
319 * The previous behavior in log_console() is preserved when
320 * log_console_add_linefeed is non-zero. For that behavior, if an
321 * individual console write came in that was not terminated with a
322 * line feed, it would add a line feed.
324 * This results in different data in the message buffer than
325 * appears on the system console (which doesn't add extra line feed
328 * A number of programs and rc scripts write a line feed, or a period
329 * and a line feed when they have completed their operation. On
330 * the console, this looks seamless, but when displayed with
331 * 'dmesg -a', you wind up with output that looks like this:
336 * On the console, it looks like this:
339 * We could add logic to detect that situation, or just not insert
340 * the extra newlines. Set the kern.log_console_add_linefeed
341 * sysctl/tunable variable to get the old behavior.
343 if (!nl && log_console_add_linefeed) {
344 consbuffer[0] = '\n';
345 consbuffer[1] = '\0';
346 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
350 free(consbuffer, M_TEMP);
355 printf(const char *fmt, ...)
361 retval = vprintf(fmt, ap);
368 vprintf(const char *fmt, va_list ap)
370 struct putchar_arg pca;
372 #ifdef PRINTF_BUFR_SIZE
373 char bufr[PRINTF_BUFR_SIZE];
377 pca.flags = TOCONS | TOLOG;
379 #ifdef PRINTF_BUFR_SIZE
381 pca.p_next = pca.p_bufr;
382 pca.n_bufr = sizeof(bufr);
383 pca.remain = sizeof(bufr);
386 /* Don't buffer console output. */
390 retval = kvprintf(fmt, putchar, &pca, 10, ap);
392 #ifdef PRINTF_BUFR_SIZE
393 /* Write any buffered console/log output: */
394 if (*pca.p_bufr != '\0') {
396 msglogstr(pca.p_bufr, pca.pri, /*filter_cr*/ 1);
407 putbuf(int c, struct putchar_arg *ap)
409 /* Check if no console output buffer was provided. */
410 if (ap->p_bufr == NULL) {
411 /* Output direct to the console. */
412 if (ap->flags & TOCONS)
415 if (ap->flags & TOLOG)
416 msglogchar(c, ap->pri);
418 /* Buffer the character: */
422 /* Always leave the buffer zero terminated. */
425 /* Check if the buffer needs to be flushed. */
426 if (ap->remain == 2 || c == '\n') {
428 if (ap->flags & TOLOG)
429 msglogstr(ap->p_bufr, ap->pri, /*filter_cr*/1);
431 if (ap->flags & TOCONS) {
432 if ((panicstr == NULL) && (constty != NULL))
433 msgbuf_addstr(&consmsgbuf, -1,
434 ap->p_bufr, /*filter_cr*/ 0);
436 if ((constty == NULL) ||(always_console_output))
440 ap->p_next = ap->p_bufr;
441 ap->remain = ap->n_bufr;
446 * Since we fill the buffer up one character at a time,
447 * this should not happen. We should always catch it when
448 * ap->remain == 2 (if not sooner due to a newline), flush
449 * the buffer and move on. One way this could happen is
450 * if someone sets PRINTF_BUFR_SIZE to 1 or something
453 KASSERT(ap->remain > 2, ("Bad buffer logic, remain = %zd",
459 * Print a character on console or users terminal. If destination is
460 * the console then the last bunch of characters are saved in msgbuf for
464 putchar(int c, void *arg)
466 struct putchar_arg *ap = (struct putchar_arg*) arg;
467 struct tty *tp = ap->tty;
468 int flags = ap->flags;
471 /* Don't use the tty code after a panic or while in ddb. */
476 if ((panicstr == NULL) && (flags & TOTTY) && (tp != NULL))
479 if (flags & TOCONS) {
484 if ((flags & TOLOG) && (putbuf_done == 0)) {
491 * Scaled down version of sprintf(3).
494 sprintf(char *buf, const char *cfmt, ...)
500 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
507 * Scaled down version of vsprintf(3).
510 vsprintf(char *buf, const char *cfmt, va_list ap)
514 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
520 * Scaled down version of snprintf(3).
523 snprintf(char *str, size_t size, const char *format, ...)
528 va_start(ap, format);
529 retval = vsnprintf(str, size, format, ap);
535 * Scaled down version of vsnprintf(3).
538 vsnprintf(char *str, size_t size, const char *format, va_list ap)
540 struct snprintf_arg info;
545 retval = kvprintf(format, snprintf_func, &info, 10, ap);
546 if (info.remain >= 1)
552 * Kernel version which takes radix argument vsnprintf(3).
555 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
557 struct snprintf_arg info;
562 retval = kvprintf(format, snprintf_func, &info, radix, ap);
563 if (info.remain >= 1)
569 snprintf_func(int ch, void *arg)
571 struct snprintf_arg *const info = arg;
573 if (info->remain >= 2) {
580 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
581 * order; return an optional length and a pointer to the last character
582 * written in the buffer (i.e., the first character of the string).
583 * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
586 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
593 c = hex2ascii(num % base);
594 *++p = upper ? toupper(c) : c;
595 } while (num /= base);
602 * Scaled down version of printf(3).
604 * Two additional formats:
606 * The format %b is supported to decode error registers.
609 * printf("reg=%b\n", regval, "<base><arg>*");
611 * where <base> is the output base expressed as a control character, e.g.
612 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
613 * the first of which gives the bit number to be inspected (origin 1), and
614 * the next characters (up to a control character, i.e. a character <= 32),
615 * give the name of the register. Thus:
617 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
619 * would produce output:
621 * reg=3<BITTWO,BITONE>
623 * XXX: %D -- Hexdump, takes pointer and separator string:
624 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
625 * ("%*D", len, ptr, " " -> XX XX XX XX ...
628 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
630 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
633 const char *p, *percent, *q;
637 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
638 int cflag, hflag, jflag, tflag, zflag;
641 int stop = 0, retval = 0;
650 fmt = "(fmt null)\n";
652 if (radix < 2 || radix > 36)
658 while ((ch = (u_char)*fmt++) != '%' || stop) {
664 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
665 sign = 0; dot = 0; dwidth = 0; upper = 0;
666 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
667 reswitch: switch (ch = (u_char)*fmt++) {
685 width = va_arg(ap, int);
691 dwidth = va_arg(ap, int);
699 case '1': case '2': case '3': case '4':
700 case '5': case '6': case '7': case '8': case '9':
701 for (n = 0;; ++fmt) {
702 n = n * 10 + ch - '0';
704 if (ch < '0' || ch > '9')
713 num = (u_int)va_arg(ap, int);
714 p = va_arg(ap, char *);
715 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
723 if (num & (1 << (n - 1))) {
724 PCHAR(tmp ? ',' : '<');
725 for (; (n = *p) > ' '; ++p)
729 for (; *p > ' '; ++p)
736 PCHAR(va_arg(ap, int));
739 up = va_arg(ap, u_char *);
740 p = va_arg(ap, char *);
744 PCHAR(hex2ascii(*up >> 4));
745 PCHAR(hex2ascii(*up & 0x0f));
776 *(va_arg(ap, intmax_t *)) = retval;
778 *(va_arg(ap, quad_t *)) = retval;
780 *(va_arg(ap, long *)) = retval;
782 *(va_arg(ap, size_t *)) = retval;
784 *(va_arg(ap, short *)) = retval;
786 *(va_arg(ap, char *)) = retval;
788 *(va_arg(ap, int *)) = retval;
795 sharpflag = (width == 0);
797 num = (uintptr_t)va_arg(ap, void *);
808 p = va_arg(ap, char *);
814 for (n = 0; n < dwidth && p[n]; n++)
819 if (!ladjust && width > 0)
824 if (ladjust && width > 0)
849 num = va_arg(ap, uintmax_t);
851 num = va_arg(ap, u_quad_t);
853 num = va_arg(ap, ptrdiff_t);
855 num = va_arg(ap, u_long);
857 num = va_arg(ap, size_t);
859 num = (u_short)va_arg(ap, int);
861 num = (u_char)va_arg(ap, int);
863 num = va_arg(ap, u_int);
867 num = va_arg(ap, intmax_t);
869 num = va_arg(ap, quad_t);
871 num = va_arg(ap, ptrdiff_t);
873 num = va_arg(ap, long);
875 num = va_arg(ap, ssize_t);
877 num = (short)va_arg(ap, int);
879 num = (char)va_arg(ap, int);
881 num = va_arg(ap, int);
883 if (sign && (intmax_t)num < 0) {
885 num = -(intmax_t)num;
887 p = ksprintn(nbuf, num, base, &n, upper);
889 if (sharpflag && num != 0) {
898 if (!ladjust && padc == '0')
899 dwidth = width - tmp;
900 width -= tmp + imax(dwidth, n);
907 if (sharpflag && num != 0) {
910 } else if (base == 16) {
927 while (percent < fmt)
930 * Since we ignore an formatting argument it is no
931 * longer safe to obey the remaining formatting
932 * arguments as the arguments will no longer match
943 * Put character in log buffer with a particular priority.
946 msglogchar(int c, int pri)
948 static int lastpri = -1;
955 if (c == '\0' || c == '\r')
957 if (pri != -1 && pri != lastpri) {
959 msgbuf_addchar(msgbufp, '\n');
962 msgbuf_addchar(msgbufp, '<');
963 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
964 msgbuf_addchar(msgbufp, *p--);
965 msgbuf_addchar(msgbufp, '>');
968 msgbuf_addchar(msgbufp, c);
978 msglogstr(char *str, int pri, int filter_cr)
983 msgbuf_addstr(msgbufp, pri, str, filter_cr);
987 msgbufinit(void *ptr, int size)
990 static struct msgbuf *oldp = NULL;
992 size -= sizeof(*msgbufp);
994 msgbufp = (struct msgbuf *)(cp + size);
995 msgbuf_reinit(msgbufp, cp, size);
996 if (msgbufmapped && oldp != msgbufp)
997 msgbuf_copy(oldp, msgbufp);
1002 static int unprivileged_read_msgbuf = 1;
1003 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
1004 CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
1005 "Unprivileged processes may read the kernel message buffer");
1007 /* Sysctls for accessing/clearing the msgbuf */
1009 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
1015 if (!unprivileged_read_msgbuf) {
1016 error = priv_check(req->td, PRIV_MSGBUF);
1021 /* Read the whole buffer, one chunk at a time. */
1022 mtx_lock(&msgbuf_lock);
1023 msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
1025 len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq);
1026 mtx_unlock(&msgbuf_lock);
1030 error = sysctl_handle_opaque(oidp, buf, len, req);
1034 mtx_lock(&msgbuf_lock);
1038 SYSCTL_PROC(_kern, OID_AUTO, msgbuf,
1039 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
1040 NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
1042 static int msgbuf_clearflag;
1045 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
1048 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
1049 if (!error && req->newptr) {
1050 mtx_lock(&msgbuf_lock);
1051 msgbuf_clear(msgbufp);
1052 mtx_unlock(&msgbuf_lock);
1053 msgbuf_clearflag = 0;
1058 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
1059 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE,
1060 &msgbuf_clearflag, 0, sysctl_kern_msgbuf_clear, "I",
1061 "Clear kernel message buffer");
1065 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
1069 if (!msgbufmapped) {
1070 db_printf("msgbuf not mapped yet\n");
1073 db_printf("msgbufp = %p\n", msgbufp);
1074 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
1075 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
1076 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
1077 for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) {
1078 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
1079 db_printf("%c", msgbufp->msg_ptr[j]);
1087 hexdump(const void *ptr, int length, const char *hdr, int flags)
1091 const unsigned char *cp;
1094 if ((flags & HD_DELIM_MASK) != 0)
1095 delim = (flags & HD_DELIM_MASK) >> 8;
1099 if ((flags & HD_COLUMN_MASK) != 0)
1100 cols = flags & HD_COLUMN_MASK;
1105 for (i = 0; i < length; i+= cols) {
1109 if ((flags & HD_OMIT_COUNT) == 0)
1112 if ((flags & HD_OMIT_HEX) == 0) {
1113 for (j = 0; j < cols; j++) {
1116 printf("%c%02x", delim, cp[k]);
1122 if ((flags & HD_OMIT_CHARS) == 0) {
1124 for (j = 0; j < cols; j++) {
1128 else if (cp[k] >= ' ' && cp[k] <= '~')
1129 printf("%c", cp[k]);