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 TUNABLE_INT("kern.log_console_output", &log_console_output);
114 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW,
115 &log_console_output, 0, "Duplicate console output to the syslog.");
118 * See the comment in log_console() below for more explanation of this.
120 static int log_console_add_linefeed = 0;
121 TUNABLE_INT("kern.log_console_add_linefeed", &log_console_add_linefeed);
122 SYSCTL_INT(_kern, OID_AUTO, log_console_add_linefeed, CTLFLAG_RW,
123 &log_console_add_linefeed, 0, "log_console() adds extra newlines.");
125 static int always_console_output = 0;
126 TUNABLE_INT("kern.always_console_output", &always_console_output);
127 SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RW,
128 &always_console_output, 0, "Always output to console despite TIOCCONS.");
131 * Warn that a system table is full.
134 tablefull(const char *tab)
137 log(LOG_ERR, "%s: table is full\n", tab);
141 * Uprintf prints to the controlling terminal for the current process.
144 uprintf(const char *fmt, ...)
147 struct putchar_arg pca;
153 if (TD_IS_IDLETHREAD(td))
156 sx_slock(&proctree_lock);
159 if ((p->p_flag & P_CONTROLT) == 0) {
161 sx_sunlock(&proctree_lock);
164 SESS_LOCK(p->p_session);
165 pca.tty = p->p_session->s_ttyp;
166 SESS_UNLOCK(p->p_session);
168 if (pca.tty == NULL) {
169 sx_sunlock(&proctree_lock);
176 sx_sunlock(&proctree_lock);
177 retval = kvprintf(fmt, putchar, &pca, 10, ap);
184 * tprintf and vtprintf print on the controlling terminal associated with the
185 * given session, possibly to the log as well.
188 tprintf(struct proc *p, int pri, const char *fmt, ...)
193 vtprintf(p, pri, fmt, ap);
198 vtprintf(struct proc *p, int pri, const char *fmt, va_list ap)
200 struct tty *tp = NULL;
202 struct putchar_arg pca;
203 struct session *sess = NULL;
205 sx_slock(&proctree_lock);
210 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
215 if (tp != NULL && tty_checkoutq(tp))
228 sx_sunlock(&proctree_lock);
229 kvprintf(fmt, putchar, &pca, 10, ap);
238 * Ttyprintf displays a message on a tty; it should be used only by
239 * the tty driver, or anything that knows the underlying tty will not
240 * be revoke(2)'d away. Other callers should use tprintf.
243 ttyprintf(struct tty *tp, const char *fmt, ...)
246 struct putchar_arg pca;
253 retval = kvprintf(fmt, putchar, &pca, 10, ap);
259 _vprintf(int level, int flags, const char *fmt, va_list ap)
261 struct putchar_arg pca;
263 #ifdef PRINTF_BUFR_SIZE
264 char bufr[PRINTF_BUFR_SIZE];
270 #ifdef PRINTF_BUFR_SIZE
272 pca.p_next = pca.p_bufr;
273 pca.n_bufr = sizeof(bufr);
274 pca.remain = sizeof(bufr);
277 /* Don't buffer console output. */
281 retval = kvprintf(fmt, putchar, &pca, 10, ap);
283 #ifdef PRINTF_BUFR_SIZE
284 /* Write any buffered console/log output: */
285 if (*pca.p_bufr != '\0') {
286 if (pca.flags & TOLOG)
287 msglogstr(pca.p_bufr, level, /*filter_cr*/1);
289 if (pca.flags & TOCONS)
298 * Log writes to the log buffer, and guarantees not to sleep (so can be
299 * called by interrupt routines). If there is no process reading the
300 * log yet, it writes to the console also.
303 log(int level, const char *fmt, ...)
308 (void)_vprintf(level, log_open ? TOLOG : TOCONS | TOLOG, fmt, ap);
314 #define CONSCHUNK 128
317 log_console(struct uio *uio)
323 if (!log_console_output)
326 pri = LOG_INFO | LOG_CONSOLE;
328 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
331 while (uio->uio_resid > 0) {
332 c = imin(uio->uio_resid, CONSCHUNK - 1);
333 error = uiomove(consbuffer, c, uio);
336 /* Make sure we're NUL-terminated */
337 consbuffer[c] = '\0';
338 if (consbuffer[c - 1] == '\n')
342 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
345 * The previous behavior in log_console() is preserved when
346 * log_console_add_linefeed is non-zero. For that behavior, if an
347 * individual console write came in that was not terminated with a
348 * line feed, it would add a line feed.
350 * This results in different data in the message buffer than
351 * appears on the system console (which doesn't add extra line feed
354 * A number of programs and rc scripts write a line feed, or a period
355 * and a line feed when they have completed their operation. On
356 * the console, this looks seamless, but when displayed with
357 * 'dmesg -a', you wind up with output that looks like this:
362 * On the console, it looks like this:
365 * We could add logic to detect that situation, or just not insert
366 * the extra newlines. Set the kern.log_console_add_linefeed
367 * sysctl/tunable variable to get the old behavior.
369 if (!nl && log_console_add_linefeed) {
370 consbuffer[0] = '\n';
371 consbuffer[1] = '\0';
372 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
376 free(consbuffer, M_TEMP);
380 printf(const char *fmt, ...)
386 retval = vprintf(fmt, ap);
393 vprintf(const char *fmt, va_list ap)
397 retval = _vprintf(-1, TOCONS | TOLOG, fmt, ap);
406 putbuf(int c, struct putchar_arg *ap)
408 /* Check if no console output buffer was provided. */
409 if (ap->p_bufr == NULL) {
410 /* Output direct to the console. */
411 if (ap->flags & TOCONS)
414 if (ap->flags & TOLOG)
415 msglogchar(c, ap->pri);
417 /* Buffer the character: */
421 /* Always leave the buffer zero terminated. */
424 /* Check if the buffer needs to be flushed. */
425 if (ap->remain == 2 || c == '\n') {
427 if (ap->flags & TOLOG)
428 msglogstr(ap->p_bufr, ap->pri, /*filter_cr*/1);
430 if (ap->flags & TOCONS) {
431 if ((panicstr == NULL) && (constty != NULL))
432 msgbuf_addstr(&consmsgbuf, -1,
433 ap->p_bufr, /*filter_cr*/ 0);
435 if ((constty == NULL) ||(always_console_output))
439 ap->p_next = ap->p_bufr;
440 ap->remain = ap->n_bufr;
445 * Since we fill the buffer up one character at a time,
446 * this should not happen. We should always catch it when
447 * ap->remain == 2 (if not sooner due to a newline), flush
448 * the buffer and move on. One way this could happen is
449 * if someone sets PRINTF_BUFR_SIZE to 1 or something
452 KASSERT(ap->remain > 2, ("Bad buffer logic, remain = %zd",
458 * Print a character on console or users terminal. If destination is
459 * the console then the last bunch of characters are saved in msgbuf for
463 putchar(int c, void *arg)
465 struct putchar_arg *ap = (struct putchar_arg*) arg;
466 struct tty *tp = ap->tty;
467 int flags = ap->flags;
469 /* Don't use the tty code after a panic or while in ddb. */
476 if ((flags & TOTTY) && tp != NULL && panicstr == NULL)
479 if ((flags & (TOCONS | TOLOG)) && c != '\0')
484 * Scaled down version of sprintf(3).
487 sprintf(char *buf, const char *cfmt, ...)
493 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
500 * Scaled down version of vsprintf(3).
503 vsprintf(char *buf, const char *cfmt, va_list ap)
507 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
513 * Scaled down version of snprintf(3).
516 snprintf(char *str, size_t size, const char *format, ...)
521 va_start(ap, format);
522 retval = vsnprintf(str, size, format, ap);
528 * Scaled down version of vsnprintf(3).
531 vsnprintf(char *str, size_t size, const char *format, va_list ap)
533 struct snprintf_arg info;
538 retval = kvprintf(format, snprintf_func, &info, 10, ap);
539 if (info.remain >= 1)
545 * Kernel version which takes radix argument vsnprintf(3).
548 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
550 struct snprintf_arg info;
555 retval = kvprintf(format, snprintf_func, &info, radix, ap);
556 if (info.remain >= 1)
562 snprintf_func(int ch, void *arg)
564 struct snprintf_arg *const info = arg;
566 if (info->remain >= 2) {
573 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
574 * order; return an optional length and a pointer to the last character
575 * written in the buffer (i.e., the first character of the string).
576 * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
579 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
586 c = hex2ascii(num % base);
587 *++p = upper ? toupper(c) : c;
588 } while (num /= base);
595 * Scaled down version of printf(3).
597 * Two additional formats:
599 * The format %b is supported to decode error registers.
602 * printf("reg=%b\n", regval, "<base><arg>*");
604 * where <base> is the output base expressed as a control character, e.g.
605 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
606 * the first of which gives the bit number to be inspected (origin 1), and
607 * the next characters (up to a control character, i.e. a character <= 32),
608 * give the name of the register. Thus:
610 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
612 * would produce output:
614 * reg=3<BITTWO,BITONE>
616 * XXX: %D -- Hexdump, takes pointer and separator string:
617 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
618 * ("%*D", len, ptr, " " -> XX XX XX XX ...
621 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
623 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
626 const char *p, *percent, *q;
630 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
631 int cflag, hflag, jflag, tflag, zflag;
634 int stop = 0, retval = 0;
643 fmt = "(fmt null)\n";
645 if (radix < 2 || radix > 36)
651 while ((ch = (u_char)*fmt++) != '%' || stop) {
657 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
658 sign = 0; dot = 0; dwidth = 0; upper = 0;
659 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
660 reswitch: switch (ch = (u_char)*fmt++) {
678 width = va_arg(ap, int);
684 dwidth = va_arg(ap, int);
692 case '1': case '2': case '3': case '4':
693 case '5': case '6': case '7': case '8': case '9':
694 for (n = 0;; ++fmt) {
695 n = n * 10 + ch - '0';
697 if (ch < '0' || ch > '9')
706 num = (u_int)va_arg(ap, int);
707 p = va_arg(ap, char *);
708 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
716 if (num & (1 << (n - 1))) {
717 PCHAR(tmp ? ',' : '<');
718 for (; (n = *p) > ' '; ++p)
722 for (; *p > ' '; ++p)
729 PCHAR(va_arg(ap, int));
732 up = va_arg(ap, u_char *);
733 p = va_arg(ap, char *);
737 PCHAR(hex2ascii(*up >> 4));
738 PCHAR(hex2ascii(*up & 0x0f));
769 *(va_arg(ap, intmax_t *)) = retval;
771 *(va_arg(ap, quad_t *)) = retval;
773 *(va_arg(ap, long *)) = retval;
775 *(va_arg(ap, size_t *)) = retval;
777 *(va_arg(ap, short *)) = retval;
779 *(va_arg(ap, char *)) = retval;
781 *(va_arg(ap, int *)) = retval;
788 sharpflag = (width == 0);
790 num = (uintptr_t)va_arg(ap, void *);
801 p = va_arg(ap, char *);
807 for (n = 0; n < dwidth && p[n]; n++)
812 if (!ladjust && width > 0)
817 if (ladjust && width > 0)
842 num = va_arg(ap, uintmax_t);
844 num = va_arg(ap, u_quad_t);
846 num = va_arg(ap, ptrdiff_t);
848 num = va_arg(ap, u_long);
850 num = va_arg(ap, size_t);
852 num = (u_short)va_arg(ap, int);
854 num = (u_char)va_arg(ap, int);
856 num = va_arg(ap, u_int);
860 num = va_arg(ap, intmax_t);
862 num = va_arg(ap, quad_t);
864 num = va_arg(ap, ptrdiff_t);
866 num = va_arg(ap, long);
868 num = va_arg(ap, ssize_t);
870 num = (short)va_arg(ap, int);
872 num = (char)va_arg(ap, int);
874 num = va_arg(ap, int);
876 if (sign && (intmax_t)num < 0) {
878 num = -(intmax_t)num;
880 p = ksprintn(nbuf, num, base, &n, upper);
882 if (sharpflag && num != 0) {
891 if (!ladjust && padc == '0')
892 dwidth = width - tmp;
893 width -= tmp + imax(dwidth, n);
900 if (sharpflag && num != 0) {
903 } else if (base == 16) {
920 while (percent < fmt)
923 * Since we ignore a formatting argument it is no
924 * longer safe to obey the remaining formatting
925 * arguments as the arguments will no longer match
936 * Put character in log buffer with a particular priority.
939 msglogchar(int c, int pri)
941 static int lastpri = -1;
948 if (c == '\0' || c == '\r')
950 if (pri != -1 && pri != lastpri) {
952 msgbuf_addchar(msgbufp, '\n');
955 msgbuf_addchar(msgbufp, '<');
956 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
957 msgbuf_addchar(msgbufp, *p--);
958 msgbuf_addchar(msgbufp, '>');
961 msgbuf_addchar(msgbufp, c);
971 msglogstr(char *str, int pri, int filter_cr)
976 msgbuf_addstr(msgbufp, pri, str, filter_cr);
980 msgbufinit(void *ptr, int size)
983 static struct msgbuf *oldp = NULL;
985 size -= sizeof(*msgbufp);
987 msgbufp = (struct msgbuf *)(cp + size);
988 msgbuf_reinit(msgbufp, cp, size);
989 if (msgbufmapped && oldp != msgbufp)
990 msgbuf_copy(oldp, msgbufp);
995 static int unprivileged_read_msgbuf = 1;
996 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
997 CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
998 "Unprivileged processes may read the kernel message buffer");
1000 /* Sysctls for accessing/clearing the msgbuf */
1002 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
1008 if (!unprivileged_read_msgbuf) {
1009 error = priv_check(req->td, PRIV_MSGBUF);
1014 /* Read the whole buffer, one chunk at a time. */
1015 mtx_lock(&msgbuf_lock);
1016 msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
1018 len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq);
1019 mtx_unlock(&msgbuf_lock);
1023 error = sysctl_handle_opaque(oidp, buf, len, req);
1027 mtx_lock(&msgbuf_lock);
1031 SYSCTL_PROC(_kern, OID_AUTO, msgbuf,
1032 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
1033 NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
1035 static int msgbuf_clearflag;
1038 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
1041 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
1042 if (!error && req->newptr) {
1043 mtx_lock(&msgbuf_lock);
1044 msgbuf_clear(msgbufp);
1045 mtx_unlock(&msgbuf_lock);
1046 msgbuf_clearflag = 0;
1051 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
1052 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE,
1053 &msgbuf_clearflag, 0, sysctl_kern_msgbuf_clear, "I",
1054 "Clear kernel message buffer");
1058 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
1062 if (!msgbufmapped) {
1063 db_printf("msgbuf not mapped yet\n");
1066 db_printf("msgbufp = %p\n", msgbufp);
1067 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
1068 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
1069 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
1070 for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) {
1071 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
1072 db_printf("%c", msgbufp->msg_ptr[j]);
1080 hexdump(const void *ptr, int length, const char *hdr, int flags)
1084 const unsigned char *cp;
1087 if ((flags & HD_DELIM_MASK) != 0)
1088 delim = (flags & HD_DELIM_MASK) >> 8;
1092 if ((flags & HD_COLUMN_MASK) != 0)
1093 cols = flags & HD_COLUMN_MASK;
1098 for (i = 0; i < length; i+= cols) {
1102 if ((flags & HD_OMIT_COUNT) == 0)
1105 if ((flags & HD_OMIT_HEX) == 0) {
1106 for (j = 0; j < cols; j++) {
1109 printf("%c%02x", delim, cp[k]);
1115 if ((flags & HD_OMIT_CHARS) == 0) {
1117 for (j = 0; j < cols; j++) {
1121 else if (cp[k] >= ' ' && cp[k] <= '~')
1122 printf("%c", cp[k]);
1131 #endif /* _KERNEL */
1134 sbuf_hexdump(struct sbuf *sb, const void *ptr, int length, const char *hdr,
1139 const unsigned char *cp;
1142 if ((flags & HD_DELIM_MASK) != 0)
1143 delim = (flags & HD_DELIM_MASK) >> 8;
1147 if ((flags & HD_COLUMN_MASK) != 0)
1148 cols = flags & HD_COLUMN_MASK;
1153 for (i = 0; i < length; i+= cols) {
1155 sbuf_printf(sb, "%s", hdr);
1157 if ((flags & HD_OMIT_COUNT) == 0)
1158 sbuf_printf(sb, "%04x ", i);
1160 if ((flags & HD_OMIT_HEX) == 0) {
1161 for (j = 0; j < cols; j++) {
1164 sbuf_printf(sb, "%c%02x", delim, cp[k]);
1166 sbuf_printf(sb, " ");
1170 if ((flags & HD_OMIT_CHARS) == 0) {
1171 sbuf_printf(sb, " |");
1172 for (j = 0; j < cols; j++) {
1175 sbuf_printf(sb, " ");
1176 else if (cp[k] >= ' ' && cp[k] <= '~')
1177 sbuf_printf(sb, "%c", cp[k]);
1179 sbuf_printf(sb, ".");
1181 sbuf_printf(sb, "|");
1183 sbuf_printf(sb, "\n");
1189 counted_warning(unsigned *counter, const char *msg)
1198 if (atomic_cmpset_int(counter, c, c - 1)) {
1200 log(LOG_INFO, "pid %d (%s) %s%s\n",
1201 td->td_proc->p_pid, td->td_name, msg,
1202 c > 1 ? "" : " - not logging anymore");