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 * 3. 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.
76 #include <machine/stdarg.h>
87 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
88 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
100 struct snprintf_arg {
107 static void msglogchar(int c, int pri);
108 static void msglogstr(char *str, int pri, int filter_cr);
109 static void putchar(int ch, void *arg);
110 static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len, int upper);
111 static void snprintf_func(int ch, void *arg);
113 static int msgbufmapped; /* Set when safe to use msgbuf */
116 static int log_console_output = 1;
117 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RWTUN,
118 &log_console_output, 0, "Duplicate console output to the syslog");
121 * See the comment in log_console() below for more explanation of this.
123 static int log_console_add_linefeed;
124 SYSCTL_INT(_kern, OID_AUTO, log_console_add_linefeed, CTLFLAG_RWTUN,
125 &log_console_add_linefeed, 0, "log_console() adds extra newlines");
127 static int always_console_output;
128 SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RWTUN,
129 &always_console_output, 0, "Always output to console despite TIOCCONS");
132 * Warn that a system table is full.
135 tablefull(const char *tab)
138 log(LOG_ERR, "%s: table is full\n", tab);
142 * Uprintf prints to the controlling terminal for the current process.
145 uprintf(const char *fmt, ...)
148 struct putchar_arg pca;
154 if (TD_IS_IDLETHREAD(td))
157 sx_slock(&proctree_lock);
160 if ((p->p_flag & P_CONTROLT) == 0) {
162 sx_sunlock(&proctree_lock);
165 SESS_LOCK(p->p_session);
166 pca.tty = p->p_session->s_ttyp;
167 SESS_UNLOCK(p->p_session);
169 if (pca.tty == NULL) {
170 sx_sunlock(&proctree_lock);
177 sx_sunlock(&proctree_lock);
178 retval = kvprintf(fmt, putchar, &pca, 10, ap);
185 * tprintf and vtprintf print on the controlling terminal associated with the
186 * given session, possibly to the log as well.
189 tprintf(struct proc *p, int pri, const char *fmt, ...)
194 vtprintf(p, pri, fmt, ap);
199 vtprintf(struct proc *p, int pri, const char *fmt, va_list ap)
201 struct tty *tp = NULL;
203 struct putchar_arg pca;
204 struct session *sess = NULL;
206 sx_slock(&proctree_lock);
211 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
216 if (tp != NULL && tty_checkoutq(tp))
229 sx_sunlock(&proctree_lock);
230 kvprintf(fmt, putchar, &pca, 10, ap);
239 * Ttyprintf displays a message on a tty; it should be used only by
240 * the tty driver, or anything that knows the underlying tty will not
241 * be revoke(2)'d away. Other callers should use tprintf.
244 ttyprintf(struct tty *tp, const char *fmt, ...)
247 struct putchar_arg pca;
254 retval = kvprintf(fmt, putchar, &pca, 10, ap);
260 _vprintf(int level, int flags, const char *fmt, va_list ap)
262 struct putchar_arg pca;
264 #ifdef PRINTF_BUFR_SIZE
265 char bufr[PRINTF_BUFR_SIZE];
271 #ifdef PRINTF_BUFR_SIZE
273 pca.p_next = pca.p_bufr;
274 pca.n_bufr = sizeof(bufr);
275 pca.remain = sizeof(bufr);
278 /* Don't buffer console output. */
282 retval = kvprintf(fmt, putchar, &pca, 10, ap);
284 #ifdef PRINTF_BUFR_SIZE
285 /* Write any buffered console/log output: */
286 if (*pca.p_bufr != '\0') {
287 if (pca.flags & TOLOG)
288 msglogstr(pca.p_bufr, level, /*filter_cr*/1);
290 if (pca.flags & TOCONS)
299 * Log writes to the log buffer, and guarantees not to sleep (so can be
300 * called by interrupt routines). If there is no process reading the
301 * log yet, it writes to the console also.
304 log(int level, const char *fmt, ...)
309 vlog(level, fmt, ap);
314 vlog(int level, const char *fmt, va_list ap)
317 (void)_vprintf(level, log_open ? TOLOG : TOCONS | TOLOG, fmt, ap);
321 #define CONSCHUNK 128
324 log_console(struct uio *uio)
330 if (!log_console_output)
333 pri = LOG_INFO | LOG_CONSOLE;
335 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
338 while (uio->uio_resid > 0) {
339 c = imin(uio->uio_resid, CONSCHUNK - 1);
340 error = uiomove(consbuffer, c, uio);
343 /* Make sure we're NUL-terminated */
344 consbuffer[c] = '\0';
345 if (consbuffer[c - 1] == '\n')
349 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
352 * The previous behavior in log_console() is preserved when
353 * log_console_add_linefeed is non-zero. For that behavior, if an
354 * individual console write came in that was not terminated with a
355 * line feed, it would add a line feed.
357 * This results in different data in the message buffer than
358 * appears on the system console (which doesn't add extra line feed
361 * A number of programs and rc scripts write a line feed, or a period
362 * and a line feed when they have completed their operation. On
363 * the console, this looks seamless, but when displayed with
364 * 'dmesg -a', you wind up with output that looks like this:
369 * On the console, it looks like this:
372 * We could add logic to detect that situation, or just not insert
373 * the extra newlines. Set the kern.log_console_add_linefeed
374 * sysctl/tunable variable to get the old behavior.
376 if (!nl && log_console_add_linefeed) {
377 consbuffer[0] = '\n';
378 consbuffer[1] = '\0';
379 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
383 free(consbuffer, M_TEMP);
388 printf(const char *fmt, ...)
394 retval = vprintf(fmt, ap);
401 vprintf(const char *fmt, va_list ap)
405 retval = _vprintf(-1, TOCONS | TOLOG, fmt, ap);
414 putbuf(int c, struct putchar_arg *ap)
416 /* Check if no console output buffer was provided. */
417 if (ap->p_bufr == NULL) {
418 /* Output direct to the console. */
419 if (ap->flags & TOCONS)
422 if (ap->flags & TOLOG)
423 msglogchar(c, ap->pri);
425 /* Buffer the character: */
429 /* Always leave the buffer zero terminated. */
432 /* Check if the buffer needs to be flushed. */
433 if (ap->remain == 2 || c == '\n') {
435 if (ap->flags & TOLOG)
436 msglogstr(ap->p_bufr, ap->pri, /*filter_cr*/1);
438 if (ap->flags & TOCONS) {
439 if ((panicstr == NULL) && (constty != NULL))
440 msgbuf_addstr(&consmsgbuf, -1,
441 ap->p_bufr, /*filter_cr*/ 0);
443 if ((constty == NULL) ||(always_console_output))
447 ap->p_next = ap->p_bufr;
448 ap->remain = ap->n_bufr;
453 * Since we fill the buffer up one character at a time,
454 * this should not happen. We should always catch it when
455 * ap->remain == 2 (if not sooner due to a newline), flush
456 * the buffer and move on. One way this could happen is
457 * if someone sets PRINTF_BUFR_SIZE to 1 or something
460 KASSERT(ap->remain > 2, ("Bad buffer logic, remain = %zd",
466 * Print a character on console or users terminal. If destination is
467 * the console then the last bunch of characters are saved in msgbuf for
471 putchar(int c, void *arg)
473 struct putchar_arg *ap = (struct putchar_arg*) arg;
474 struct tty *tp = ap->tty;
475 int flags = ap->flags;
477 /* Don't use the tty code after a panic or while in ddb. */
484 if ((flags & TOTTY) && tp != NULL && panicstr == NULL)
487 if ((flags & (TOCONS | TOLOG)) && c != '\0')
492 * Scaled down version of sprintf(3).
495 sprintf(char *buf, const char *cfmt, ...)
501 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
508 * Scaled down version of vsprintf(3).
511 vsprintf(char *buf, const char *cfmt, va_list ap)
515 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
521 * Scaled down version of snprintf(3).
524 snprintf(char *str, size_t size, const char *format, ...)
529 va_start(ap, format);
530 retval = vsnprintf(str, size, format, ap);
536 * Scaled down version of vsnprintf(3).
539 vsnprintf(char *str, size_t size, const char *format, va_list ap)
541 struct snprintf_arg info;
546 retval = kvprintf(format, snprintf_func, &info, 10, ap);
547 if (info.remain >= 1)
553 * Kernel version which takes radix argument vsnprintf(3).
556 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
558 struct snprintf_arg info;
563 retval = kvprintf(format, snprintf_func, &info, radix, ap);
564 if (info.remain >= 1)
570 snprintf_func(int ch, void *arg)
572 struct snprintf_arg *const info = arg;
574 if (info->remain >= 2) {
581 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
582 * order; return an optional length and a pointer to the last character
583 * written in the buffer (i.e., the first character of the string).
584 * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
587 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
594 c = hex2ascii(num % base);
595 *++p = upper ? toupper(c) : c;
596 } while (num /= base);
603 * Scaled down version of printf(3).
605 * Two additional formats:
607 * The format %b is supported to decode error registers.
610 * printf("reg=%b\n", regval, "<base><arg>*");
612 * where <base> is the output base expressed as a control character, e.g.
613 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
614 * the first of which gives the bit number to be inspected (origin 1), and
615 * the next characters (up to a control character, i.e. a character <= 32),
616 * give the name of the register. Thus:
618 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE");
620 * would produce output:
622 * reg=3<BITTWO,BITONE>
624 * XXX: %D -- Hexdump, takes pointer and separator string:
625 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
626 * ("%*D", len, ptr, " " -> XX XX XX XX ...
629 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
631 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
634 const char *p, *percent, *q;
638 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
639 int cflag, hflag, jflag, tflag, zflag;
642 int stop = 0, retval = 0;
651 fmt = "(fmt null)\n";
653 if (radix < 2 || radix > 36)
659 while ((ch = (u_char)*fmt++) != '%' || stop) {
665 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
666 sign = 0; dot = 0; dwidth = 0; upper = 0;
667 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
668 reswitch: switch (ch = (u_char)*fmt++) {
686 width = va_arg(ap, int);
692 dwidth = va_arg(ap, int);
700 case '1': case '2': case '3': case '4':
701 case '5': case '6': case '7': case '8': case '9':
702 for (n = 0;; ++fmt) {
703 n = n * 10 + ch - '0';
705 if (ch < '0' || ch > '9')
714 num = (u_int)va_arg(ap, int);
715 p = va_arg(ap, char *);
716 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
724 if (num & (1 << (n - 1))) {
725 PCHAR(tmp ? ',' : '<');
726 for (; (n = *p) > ' '; ++p)
730 for (; *p > ' '; ++p)
739 if (!ladjust && width > 0)
742 PCHAR(va_arg(ap, int));
743 if (ladjust && width > 0)
748 up = va_arg(ap, u_char *);
749 p = va_arg(ap, char *);
753 PCHAR(hex2ascii(*up >> 4));
754 PCHAR(hex2ascii(*up & 0x0f));
785 *(va_arg(ap, intmax_t *)) = retval;
787 *(va_arg(ap, quad_t *)) = retval;
789 *(va_arg(ap, long *)) = retval;
791 *(va_arg(ap, size_t *)) = retval;
793 *(va_arg(ap, short *)) = retval;
795 *(va_arg(ap, char *)) = retval;
797 *(va_arg(ap, int *)) = retval;
804 sharpflag = (width == 0);
806 num = (uintptr_t)va_arg(ap, void *);
817 p = va_arg(ap, char *);
823 for (n = 0; n < dwidth && p[n]; n++)
828 if (!ladjust && width > 0)
833 if (ladjust && width > 0)
858 num = va_arg(ap, uintmax_t);
860 num = va_arg(ap, u_quad_t);
862 num = va_arg(ap, ptrdiff_t);
864 num = va_arg(ap, u_long);
866 num = va_arg(ap, size_t);
868 num = (u_short)va_arg(ap, int);
870 num = (u_char)va_arg(ap, int);
872 num = va_arg(ap, u_int);
876 num = va_arg(ap, intmax_t);
878 num = va_arg(ap, quad_t);
880 num = va_arg(ap, ptrdiff_t);
882 num = va_arg(ap, long);
884 num = va_arg(ap, ssize_t);
886 num = (short)va_arg(ap, int);
888 num = (char)va_arg(ap, int);
890 num = va_arg(ap, int);
892 if (sign && (intmax_t)num < 0) {
894 num = -(intmax_t)num;
896 p = ksprintn(nbuf, num, base, &n, upper);
898 if (sharpflag && num != 0) {
907 if (!ladjust && padc == '0')
908 dwidth = width - tmp;
909 width -= tmp + imax(dwidth, n);
916 if (sharpflag && num != 0) {
919 } else if (base == 16) {
936 while (percent < fmt)
939 * Since we ignore a formatting argument it is no
940 * longer safe to obey the remaining formatting
941 * arguments as the arguments will no longer match
952 * Put character in log buffer with a particular priority.
955 msglogchar(int c, int pri)
957 static int lastpri = -1;
964 if (c == '\0' || c == '\r')
966 if (pri != -1 && pri != lastpri) {
968 msgbuf_addchar(msgbufp, '\n');
971 msgbuf_addchar(msgbufp, '<');
972 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
973 msgbuf_addchar(msgbufp, *p--);
974 msgbuf_addchar(msgbufp, '>');
977 msgbuf_addchar(msgbufp, c);
987 msglogstr(char *str, int pri, int filter_cr)
992 msgbuf_addstr(msgbufp, pri, str, filter_cr);
996 msgbufinit(void *ptr, int size)
999 static struct msgbuf *oldp = NULL;
1001 size -= sizeof(*msgbufp);
1003 msgbufp = (struct msgbuf *)(cp + size);
1004 msgbuf_reinit(msgbufp, cp, size);
1005 if (msgbufmapped && oldp != msgbufp)
1006 msgbuf_copy(oldp, msgbufp);
1011 static int unprivileged_read_msgbuf = 1;
1012 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
1013 CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
1014 "Unprivileged processes may read the kernel message buffer");
1016 /* Sysctls for accessing/clearing the msgbuf */
1018 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
1024 if (!unprivileged_read_msgbuf) {
1025 error = priv_check(req->td, PRIV_MSGBUF);
1030 /* Read the whole buffer, one chunk at a time. */
1031 mtx_lock(&msgbuf_lock);
1032 msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
1034 len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq);
1035 mtx_unlock(&msgbuf_lock);
1037 return (SYSCTL_OUT(req, "", 1)); /* add nulterm */
1039 error = sysctl_handle_opaque(oidp, buf, len, req);
1043 mtx_lock(&msgbuf_lock);
1047 SYSCTL_PROC(_kern, OID_AUTO, msgbuf,
1048 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
1049 NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
1051 static int msgbuf_clearflag;
1054 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
1057 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
1058 if (!error && req->newptr) {
1059 mtx_lock(&msgbuf_lock);
1060 msgbuf_clear(msgbufp);
1061 mtx_unlock(&msgbuf_lock);
1062 msgbuf_clearflag = 0;
1067 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
1068 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE,
1069 &msgbuf_clearflag, 0, sysctl_kern_msgbuf_clear, "I",
1070 "Clear kernel message buffer");
1074 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
1078 if (!msgbufmapped) {
1079 db_printf("msgbuf not mapped yet\n");
1082 db_printf("msgbufp = %p\n", msgbufp);
1083 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
1084 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
1085 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
1086 for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) {
1087 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
1088 db_printf("%c", msgbufp->msg_ptr[j]);
1096 hexdump(const void *ptr, int length, const char *hdr, int flags)
1100 const unsigned char *cp;
1103 if ((flags & HD_DELIM_MASK) != 0)
1104 delim = (flags & HD_DELIM_MASK) >> 8;
1108 if ((flags & HD_COLUMN_MASK) != 0)
1109 cols = flags & HD_COLUMN_MASK;
1114 for (i = 0; i < length; i+= cols) {
1118 if ((flags & HD_OMIT_COUNT) == 0)
1121 if ((flags & HD_OMIT_HEX) == 0) {
1122 for (j = 0; j < cols; j++) {
1125 printf("%c%02x", delim, cp[k]);
1131 if ((flags & HD_OMIT_CHARS) == 0) {
1133 for (j = 0; j < cols; j++) {
1137 else if (cp[k] >= ' ' && cp[k] <= '~')
1138 printf("%c", cp[k]);
1147 #endif /* _KERNEL */
1150 sbuf_hexdump(struct sbuf *sb, const void *ptr, int length, const char *hdr,
1155 const unsigned char *cp;
1158 if ((flags & HD_DELIM_MASK) != 0)
1159 delim = (flags & HD_DELIM_MASK) >> 8;
1163 if ((flags & HD_COLUMN_MASK) != 0)
1164 cols = flags & HD_COLUMN_MASK;
1169 for (i = 0; i < length; i+= cols) {
1171 sbuf_printf(sb, "%s", hdr);
1173 if ((flags & HD_OMIT_COUNT) == 0)
1174 sbuf_printf(sb, "%04x ", i);
1176 if ((flags & HD_OMIT_HEX) == 0) {
1177 for (j = 0; j < cols; j++) {
1180 sbuf_printf(sb, "%c%02x", delim, cp[k]);
1182 sbuf_printf(sb, " ");
1186 if ((flags & HD_OMIT_CHARS) == 0) {
1187 sbuf_printf(sb, " |");
1188 for (j = 0; j < cols; j++) {
1191 sbuf_printf(sb, " ");
1192 else if (cp[k] >= ' ' && cp[k] <= '~')
1193 sbuf_printf(sb, "%c", cp[k]);
1195 sbuf_printf(sb, ".");
1197 sbuf_printf(sb, "|");
1199 sbuf_printf(sb, "\n");
1205 counted_warning(unsigned *counter, const char *msg)
1214 if (atomic_cmpset_int(counter, c, c - 1)) {
1216 log(LOG_INFO, "pid %d (%s) %s%s\n",
1217 td->td_proc->p_pid, td->td_name, msg,
1218 c > 1 ? "" : " - not logging anymore");