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
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20 * This product includes software developed by the University of
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35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/subr_prf.c,v 1.61.2.5 2002/08/31 18:22:08 dwmalone Exp $
40 * $DragonFly: src/sys/kern/subr_prf.c,v 1.21 2008/07/17 23:56:23 dillon Exp $
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/msgbuf.h>
49 #include <sys/malloc.h>
53 #include <sys/tprintf.h>
54 #include <sys/stdint.h>
55 #include <sys/syslog.h>
58 #include <sys/sysctl.h>
60 #include <sys/ctype.h>
61 #include <sys/eventhandler.h>
62 #include <sys/kthread.h>
64 #include <sys/thread2.h>
65 #include <sys/spinlock2.h>
72 * Note that stdarg.h and the ANSI style va_start macro is used for both
73 * ANSI and traditional C compilers. We use the __ machine version to stay
74 * within the kernel header file set.
76 #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)
99 struct tty *constty; /* pointer to console "window" tty */
101 static void msglogchar(int c, int pri);
102 static void msgaddchar(int c, void *dummy);
103 static void kputchar (int ch, void *arg);
104 static char *ksprintn (char *nbuf, uintmax_t num, int base, int *lenp,
106 static void snprintf_func (int ch, void *arg);
108 static int consintr = 1; /* Ok to handle console interrupts? */
109 static int msgbufmapped; /* Set when safe to use msgbuf */
110 static struct spinlock cons_spin = SPINLOCK_INITIALIZER(cons_spin);
111 static thread_t constty_td = NULL;
115 static int log_console_output = 1;
116 TUNABLE_INT("kern.log_console_output", &log_console_output);
117 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW,
118 &log_console_output, 0, "");
120 static int unprivileged_read_msgbuf = 1;
121 SYSCTL_INT(_security, OID_AUTO, unprivileged_read_msgbuf, CTLFLAG_RW,
122 &unprivileged_read_msgbuf, 0,
123 "Unprivileged processes may read the kernel message buffer");
126 * Warn that a system table is full.
129 tablefull(const char *tab)
132 log(LOG_ERR, "%s: table is full\n", tab);
136 * Uprintf prints to the controlling terminal for the current process.
139 uprintf(const char *fmt, ...)
141 struct proc *p = curproc;
143 struct putchar_arg pca;
146 if (p && p->p_flag & P_CONTROLT &&
147 p->p_session->s_ttyvp) {
149 pca.tty = p->p_session->s_ttyp;
152 retval = kvcprintf(fmt, kputchar, &pca, 10, ap);
159 tprintf_open(struct proc *p)
161 if ((p->p_flag & P_CONTROLT) && p->p_session->s_ttyvp) {
162 sess_hold(p->p_session);
163 return ((tpr_t) p->p_session);
165 return ((tpr_t) NULL);
169 tprintf_close(tpr_t sess)
172 sess_rele((struct session *) sess);
176 * tprintf prints on the controlling terminal associated
177 * with the given session.
180 tprintf(tpr_t tpr, const char *fmt, ...)
182 struct session *sess = (struct session *)tpr;
183 struct tty *tp = NULL;
186 struct putchar_arg pca;
189 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) {
197 retval = kvcprintf(fmt, kputchar, &pca, 10, ap);
204 * Ttyprintf displays a message on a tty; it should be used only by
205 * the tty driver, or anything that knows the underlying tty will not
206 * be revoke(2)'d away. Other callers should use tprintf.
209 ttyprintf(struct tty *tp, const char *fmt, ...)
212 struct putchar_arg pca;
218 retval = kvcprintf(fmt, kputchar, &pca, 10, ap);
224 * Log writes to the log buffer, and guarantees not to sleep (so can be
225 * called by interrupt routines). If there is no process reading the
226 * log yet, it writes to the console also.
229 log(int level, const char *fmt, ...)
233 struct putchar_arg pca;
237 pca.flags = log_open ? TOLOG : TOCONS;
240 retval = kvcprintf(fmt, kputchar, &pca, 10, ap);
247 #define CONSCHUNK 128
250 log_console(struct uio *uio)
252 int c, i, error, iovlen, nl;
254 struct iovec *miov = NULL;
258 if (!log_console_output)
261 pri = LOG_INFO | LOG_CONSOLE;
263 iovlen = uio->uio_iovcnt * sizeof (struct iovec);
264 MALLOC(miov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
265 MALLOC(consbuffer, char *, CONSCHUNK, M_TEMP, M_WAITOK);
266 bcopy((caddr_t)muio.uio_iov, (caddr_t)miov, iovlen);
271 while (uio->uio_resid > 0) {
272 c = (int)szmin(uio->uio_resid, CONSCHUNK);
273 error = uiomove(consbuffer, (size_t)c, uio);
276 for (i = 0; i < c; i++) {
277 msglogchar(consbuffer[i], pri);
278 if (consbuffer[i] == '\n')
285 msglogchar('\n', pri);
288 FREE(consbuffer, M_TEMP);
293 * Output to the console.
296 kprintf(const char *fmt, ...)
300 struct putchar_arg pca;
303 savintr = consintr; /* disable interrupts */
307 pca.flags = TOCONS | TOLOG;
309 retval = kvcprintf(fmt, kputchar, &pca, 10, ap);
313 consintr = savintr; /* reenable interrupts */
318 kvprintf(const char *fmt, __va_list ap)
321 struct putchar_arg pca;
324 savintr = consintr; /* disable interrupts */
327 pca.flags = TOCONS | TOLOG;
329 retval = kvcprintf(fmt, kputchar, &pca, 10, ap);
332 consintr = savintr; /* reenable interrupts */
337 * Limited rate kprintf. The passed rate structure must be initialized
338 * with the desired reporting frequency. A frequency of 0 will result in
341 * count may be initialized to a negative number to allow an initial
345 krateprintf(struct krate *rate, const char *fmt, ...)
349 if (rate->ticks != (int)time_second) {
350 rate->ticks = (int)time_second;
354 if (rate->count < rate->freq) {
363 * Print a character to the dmesg log, the console, and/or the user's
366 * NOTE: TOTTY does not require nonblocking operation, but TOCONS
367 * and TOLOG do. When we have a constty we still output to
368 * the real console but we have a monitoring thread which
369 * we wakeup which tracks the log.
372 kputchar(int c, void *arg)
374 struct putchar_arg *ap = (struct putchar_arg*) arg;
375 int flags = ap->flags;
376 struct tty *tp = ap->tty;
380 if ((flags & TOCONS) && tp == NULL && constty)
381 flags |= TOLOG | TOWAKEUP;
382 if ((flags & TOTTY) && tputchar(c, tp) < 0)
385 msglogchar(c, ap->pri);
386 if ((flags & TOCONS) && c)
388 if (flags & TOWAKEUP)
393 * Scaled down version of sprintf(3).
396 ksprintf(char *buf, const char *cfmt, ...)
401 __va_start(ap, cfmt);
402 retval = kvcprintf(cfmt, NULL, (void *)buf, 10, ap);
409 * Scaled down version of vsprintf(3).
412 kvsprintf(char *buf, const char *cfmt, __va_list ap)
416 retval = kvcprintf(cfmt, NULL, (void *)buf, 10, ap);
422 * Scaled down version of snprintf(3).
425 ksnprintf(char *str, size_t size, const char *format, ...)
430 __va_start(ap, format);
431 retval = kvsnprintf(str, size, format, ap);
437 * Scaled down version of vsnprintf(3).
440 kvsnprintf(char *str, size_t size, const char *format, __va_list ap)
442 struct snprintf_arg info;
447 retval = kvcprintf(format, snprintf_func, &info, 10, ap);
448 if (info.remain >= 1)
454 ksnrprintf(char *str, size_t size, int radix, const char *format, ...)
459 __va_start(ap, format);
460 retval = kvsnrprintf(str, size, radix, format, ap);
466 kvsnrprintf(char *str, size_t size, int radix, const char *format, __va_list ap)
468 struct snprintf_arg info;
473 retval = kvcprintf(format, snprintf_func, &info, radix, ap);
474 if (info.remain >= 1)
480 kvasnrprintf(char **strp, size_t size, int radix,
481 const char *format, __va_list ap)
483 struct snprintf_arg info;
486 *strp = kmalloc(size, M_TEMP, M_WAITOK);
489 retval = kvcprintf(format, snprintf_func, &info, radix, ap);
490 if (info.remain >= 1)
496 kvasfree(char **strp)
499 kfree(*strp, M_TEMP);
505 snprintf_func(int ch, void *arg)
507 struct snprintf_arg *const info = arg;
509 if (info->remain >= 2) {
516 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
517 * order; return an optional length and a pointer to the last character
518 * written in the buffer (i.e., the first character of the string).
519 * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
522 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
529 c = hex2ascii(num % base);
530 *++p = upper ? toupper(c) : c;
531 } while (num /= base);
538 * Scaled down version of printf(3).
540 * Two additional formats:
542 * The format %b is supported to decode error registers.
545 * kprintf("reg=%b\n", regval, "<base><arg>*");
547 * where <base> is the output base expressed as a control character, e.g.
548 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
549 * the first of which gives the bit number to be inspected (origin 1), and
550 * the next characters (up to a control character, i.e. a character <= 32),
551 * give the name of the register. Thus:
553 * kvcprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
555 * would produce output:
557 * reg=3<BITTWO,BITONE>
559 * XXX: %D -- Hexdump, takes pointer and separator string:
560 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
561 * ("%*D", len, ptr, " " -> XX XX XX XX ...
564 #define PCHAR(c) {int cc=(c); if(func) (*func)(cc,arg); else *d++=cc; retval++;}
567 kvcprintf(char const *fmt, void (*func)(int, void*), void *arg,
568 int radix, __va_list ap)
572 const char *p, *percent, *q;
576 int base, tmp, width, ladjust, sharpflag, neg, sign, dot;
577 int cflag, hflag, jflag, lflag, qflag, tflag, zflag;
580 int retval = 0, stop = 0;
584 * Make a supreme effort to avoid reentrant panics or deadlocks.
586 * NOTE! Do nothing that would access mycpu/gd/fs unless the
587 * function is the normal kputchar(), which allows us to
588 * use this function for very early debugging with a special
591 if (func == kputchar) {
592 if (mycpu->gd_flags & GDF_KPRINTF)
594 atomic_set_long(&mycpu->gd_flags, GDF_KPRINTF);
604 fmt = "(fmt null)\n";
606 if (radix < 2 || radix > 36)
609 usespin = (func == kputchar &&
610 panic_cpu_gd != mycpu &&
611 (((struct putchar_arg *)arg)->flags & TOTTY) == 0);
614 spin_lock(&cons_spin);
620 while ((ch = (u_char)*fmt++) != '%' || stop) {
626 dot = dwidth = ladjust = neg = sharpflag = sign = upper = 0;
627 cflag = hflag = jflag = lflag = qflag = tflag = zflag = 0;
630 switch (ch = (u_char)*fmt++) {
648 width = __va_arg(ap, int);
654 dwidth = __va_arg(ap, int);
662 case '1': case '2': case '3': case '4':
663 case '5': case '6': case '7': case '8': case '9':
664 for (n = 0;; ++fmt) {
665 n = n * 10 + ch - '0';
667 if (ch < '0' || ch > '9')
676 num = (u_int)__va_arg(ap, int);
677 p = __va_arg(ap, char *);
678 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
686 if (num & (1 << (n - 1))) {
687 PCHAR(tmp ? ',' : '<');
688 for (; (n = *p) > ' '; ++p)
692 for (; *p > ' '; ++p)
699 PCHAR(__va_arg(ap, int));
702 up = __va_arg(ap, u_char *);
703 p = __va_arg(ap, char *);
707 PCHAR(hex2ascii(*up >> 4));
708 PCHAR(hex2ascii(*up & 0x0f));
739 *(__va_arg(ap, char *)) = retval;
741 *(__va_arg(ap, short *)) = retval;
743 *(__va_arg(ap, intmax_t *)) = retval;
745 *(__va_arg(ap, long *)) = retval;
747 *(__va_arg(ap, quad_t *)) = retval;
749 *(__va_arg(ap, int *)) = retval;
756 sharpflag = (width == 0);
758 num = (uintptr_t)__va_arg(ap, void *);
769 p = __va_arg(ap, char *);
775 for (n = 0; n < dwidth && p[n]; n++)
780 if (!ladjust && width > 0)
785 if (ladjust && width > 0)
807 num = (u_char)__va_arg(ap, int);
809 num = (u_short)__va_arg(ap, int);
811 num = __va_arg(ap, uintmax_t);
813 num = __va_arg(ap, u_long);
815 num = __va_arg(ap, u_quad_t);
817 num = __va_arg(ap, ptrdiff_t);
819 num = __va_arg(ap, size_t);
821 num = __va_arg(ap, u_int);
825 num = (char)__va_arg(ap, int);
827 num = (short)__va_arg(ap, int);
829 num = __va_arg(ap, intmax_t);
831 num = __va_arg(ap, long);
833 num = __va_arg(ap, quad_t);
835 num = __va_arg(ap, ptrdiff_t);
837 num = __va_arg(ap, ssize_t);
839 num = __va_arg(ap, int);
841 if (sign && (intmax_t)num < 0) {
843 num = -(intmax_t)num;
845 p = ksprintn(nbuf, num, base, &tmp, upper);
846 if (sharpflag && num != 0) {
855 if (!ladjust && padc != '0' && width &&
856 (width -= tmp) > 0) {
862 if (sharpflag && num != 0) {
865 } else if (base == 16) {
870 if (!ladjust && width && (width -= tmp) > 0)
877 if (ladjust && width && (width -= tmp) > 0)
883 while (percent < fmt)
886 * Since we ignore an formatting argument it is no
887 * longer safe to obey the remaining formatting
888 * arguments as the arguments will no longer match
897 * Cleanup reentrancy issues.
899 if (func == kputchar)
900 atomic_clear_long(&mycpu->gd_flags, GDF_KPRINTF);
902 spin_unlock(&cons_spin);
911 * Called from the panic code to try to get the console working
912 * again in case we paniced inside a kprintf().
917 spin_init(&cons_spin);
918 atomic_clear_long(&mycpu->gd_flags, GDF_KPRINTF);
922 * Console support thread for constty intercepts. This is needed because
923 * console tty intercepts can block. Instead of having kputchar() attempt
924 * to directly write to the console intercept we just force it to log
925 * and wakeup this baby to track and dump the log to constty.
935 EVENTHANDLER_REGISTER(shutdown_pre_sync, shutdown_kproc,
936 constty_td, SHUTDOWN_PRI_FIRST);
937 constty_td->td_flags |= TDF_SYSTHREAD;
940 kproc_suspend_loop();
944 if (mbp == NULL || msgbufmapped == 0 ||
945 windex == mbp->msg_bufx) {
946 tsleep(constty_td, 0, "waiting", hz*60);
950 windex = mbp->msg_bufx;
954 * Get message buf FIFO indices. rindex is tracking.
956 if ((tp = constty) == NULL) {
957 rindex = mbp->msg_bufx;
962 * Don't blow up if the message buffer is broken
964 if (windex < 0 || windex >= mbp->msg_size)
966 if (rindex < 0 || rindex >= mbp->msg_size)
970 * And dump it. If constty gets stuck will give up.
972 while (rindex != windex) {
973 if (tputchar((uint8_t)mbp->msg_ptr[rindex], tp) < 0) {
975 rindex = mbp->msg_bufx;
978 if (++rindex >= mbp->msg_size)
980 if (tp->t_outq.c_cc >= tp->t_ohiwat) {
981 tsleep(constty_daemon, 0, "blocked", hz / 10);
982 if (tp->t_outq.c_cc >= tp->t_ohiwat) {
991 static struct kproc_desc constty_kp = {
996 SYSINIT(bufdaemon, SI_SUB_KTHREAD_UPDATE, SI_ORDER_ANY,
997 kproc_start, &constty_kp)
1000 * Put character in log buffer with a particular priority.
1005 msglogchar(int c, int pri)
1007 static int lastpri = -1;
1008 static int dangling;
1014 if (c == '\0' || c == '\r')
1016 if (pri != -1 && pri != lastpri) {
1018 msgaddchar('\n', NULL);
1021 msgaddchar('<', NULL);
1022 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
1023 msgaddchar(*p--, NULL);
1024 msgaddchar('>', NULL);
1027 msgaddchar(c, NULL);
1037 * Put char in log buffer. Make sure nothing blows up beyond repair if
1038 * we have an MP race.
1043 msgaddchar(int c, void *dummy)
1052 windex = mbp->msg_bufx;
1053 mbp->msg_ptr[windex] = c;
1054 if (++windex >= mbp->msg_size)
1056 rindex = mbp->msg_bufr;
1057 if (windex == rindex) {
1059 if (rindex >= mbp->msg_size)
1060 rindex -= mbp->msg_size;
1061 mbp->msg_bufr = rindex;
1063 mbp->msg_bufx = windex;
1067 msgbufcopy(struct msgbuf *oldp)
1071 pos = oldp->msg_bufr;
1072 while (pos != oldp->msg_bufx) {
1073 msglogchar(oldp->msg_ptr[pos], -1);
1074 if (++pos >= oldp->msg_size)
1080 msgbufinit(void *ptr, size_t size)
1083 static struct msgbuf *oldp = NULL;
1085 size -= sizeof(*msgbufp);
1087 msgbufp = (struct msgbuf *) (cp + size);
1088 if (msgbufp->msg_magic != MSG_MAGIC || msgbufp->msg_size != size ||
1089 msgbufp->msg_bufx >= size || msgbufp->msg_bufr >= size) {
1091 bzero(msgbufp, sizeof(*msgbufp));
1092 msgbufp->msg_magic = MSG_MAGIC;
1093 msgbufp->msg_size = (char *)msgbufp - cp;
1095 msgbufp->msg_ptr = cp;
1096 if (msgbufmapped && oldp != msgbufp)
1102 /* Sysctls for accessing/clearing the msgbuf */
1105 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
1111 * Only wheel or root can access the message log.
1113 if (unprivileged_read_msgbuf == 0) {
1114 KKASSERT(req->td->td_proc);
1115 cred = req->td->td_proc->p_ucred;
1117 if ((cred->cr_prison || groupmember(0, cred) == 0) &&
1118 priv_check(req->td, PRIV_ROOT) != 0
1125 * Unwind the buffer, so that it's linear (possibly starting with
1126 * some initial nulls).
1128 error = sysctl_handle_opaque(oidp, msgbufp->msg_ptr + msgbufp->msg_bufx,
1129 msgbufp->msg_size - msgbufp->msg_bufx, req);
1132 if (msgbufp->msg_bufx > 0) {
1133 error = sysctl_handle_opaque(oidp, msgbufp->msg_ptr,
1134 msgbufp->msg_bufx, req);
1139 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD,
1140 0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
1142 static int msgbuf_clear;
1145 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
1148 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
1149 if (!error && req->newptr) {
1150 /* Clear the buffer and reset write pointer */
1151 bzero(msgbufp->msg_ptr, msgbufp->msg_size);
1152 msgbufp->msg_bufr = msgbufp->msg_bufx = 0;
1158 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
1159 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clear, 0,
1160 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer");
1164 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
1168 if (!msgbufmapped) {
1169 db_printf("msgbuf not mapped yet\n");
1172 db_printf("msgbufp = %p\n", msgbufp);
1173 db_printf("magic = %x, size = %d, r= %d, w = %d, ptr = %p\n",
1174 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_bufr,
1175 msgbufp->msg_bufx, msgbufp->msg_ptr);
1176 for (i = 0; i < msgbufp->msg_size; i++) {
1177 j = (i + msgbufp->msg_bufr) % msgbufp->msg_size;
1178 db_printf("%c", msgbufp->msg_ptr[j]);
1187 hexdump(const void *ptr, int length, const char *hdr, int flags)
1191 const unsigned char *cp;
1194 if ((flags & HD_DELIM_MASK) != 0)
1195 delim = (flags & HD_DELIM_MASK) >> 8;
1199 if ((flags & HD_COLUMN_MASK) != 0)
1200 cols = flags & HD_COLUMN_MASK;
1205 for (i = 0; i < length; i+= cols) {
1209 if ((flags & HD_OMIT_COUNT) == 0)
1210 kprintf("%04x ", i);
1212 if ((flags & HD_OMIT_HEX) == 0) {
1213 for (j = 0; j < cols; j++) {
1216 kprintf("%c%02x", delim, cp[k]);
1222 if ((flags & HD_OMIT_CHARS) == 0) {
1224 for (j = 0; j < cols; j++) {
1228 else if (cp[k] >= ' ' && cp[k] <= '~')
1229 kprintf("%c", cp[k]);