usr.bin/ktrdump/ktrdump.c

   1 /*-
   2  * Copyright (c) 2002 Jake Burkholder
   3  * Copyright (c) 2004 Robert Watson
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <sys/types.h>
  32 #include <sys/ktr.h>
  33 #include <sys/mman.h>
  34 #include <sys/stat.h>
  35
  36 #include <err.h>
  37 #include <fcntl.h>
  38 #include <kvm.h>
  39 #include <limits.h>
  40 #include <nlist.h>
  41 #include <stdint.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46
  47 #define SBUFLEN 128
  48 #define USAGE \
  49         "usage: ktrdump [-cfqrtH] [-i ktrfile] [-M core] [-N system] [-o outfile]\n"
  50
  51 static void usage(void);
  52
  53 static struct nlist nl[] = {
  54         { "_ktr_version" },
  55         { "_ktr_entries" },
  56         { "_ktr_idx" },
  57         { "_ktr_buf" },
  58         { NULL }
  59 };
  60
  61 static int cflag;
  62 static int fflag;
  63 static int Mflag;
  64 static int Nflag;
  65 static int qflag;
  66 static int rflag;
  67 static int tflag;
  68 static int iflag;
  69 static int hflag;
  70
  71 static char corefile[PATH_MAX];
  72 static char execfile[PATH_MAX];
  73
  74 static char desc[SBUFLEN];
  75 static char errbuf[_POSIX2_LINE_MAX];
  76 static char fbuf[PATH_MAX];
  77 static char obuf[PATH_MAX];
  78 static char sbuf[KTR_PARMS][SBUFLEN];
  79
  80 /*
  81  * Reads the ktr trace buffer from kernel memory and prints the trace entries.
  82  */
  83 int
  84 main(int ac, char **av)
  85 {
  86         u_long parms[KTR_PARMS];
  87         struct ktr_entry *buf;
  88         uintmax_t tlast, tnow;
  89         unsigned long bufptr;
  90         struct stat sb;
  91         kvm_t *kd;
  92         FILE *out;
  93         char *p;
  94         int version;
  95         int entries;
  96         int index;
  97         int parm;
  98         int in;
  99         int c;
 100         int i = 0;
 101
 102         /*
 103          * Parse commandline arguments.
 104          */
 105         out = stdout;
 106         while ((c = getopt(ac, av, "cfqrtHe:i:m:M:N:o:")) != -1)
 107                 switch (c) {
 108                 case 'c':
 109                         cflag = 1;
 110                         break;
 111                 case 'N':
 112                 case 'e':
 113                         if (strlcpy(execfile, optarg, sizeof(execfile))
 114                             >= sizeof(execfile))
 115                                 errx(1, "%s: File name too long", optarg);
 116                         Nflag = 1;
 117                         break;
 118                 case 'f':
 119                         fflag = 1;
 120                         break;
 121                 case 'i':
 122                         iflag = 1;
 123                         if ((in = open(optarg, O_RDONLY)) == -1)
 124                                 err(1, "%s", optarg);
 125                         break;
 126                 case 'M':
 127                 case 'm':
 128                         if (strlcpy(corefile, optarg, sizeof(corefile))
 129                             >= sizeof(corefile))
 130                                 errx(1, "%s: File name too long", optarg);
 131                         Mflag = 1;
 132                         break;
 133                 case 'o':
 134                         if ((out = fopen(optarg, "w")) == NULL)
 135                                 err(1, "%s", optarg);
 136                         break;
 137                 case 'q':
 138                         qflag++;
 139                         break;
 140                 case 'r':
 141                         rflag = 1;
 142                         break;
 143                 case 't':
 144                         tflag = 1;
 145                         break;
 146                 case 'H':
 147                         hflag = 1;
 148                         break;
 149                 case '?':
 150                 default:
 151                         usage();
 152                 }
 153         ac -= optind;
 154         av += optind;
 155         if (ac != 0)
 156                 usage();
 157
 158         /*
 159          * Open our execfile and corefile, resolve needed symbols and read in
 160          * the trace buffer.
 161          */
 162         if ((kd = kvm_openfiles(Nflag ? execfile : NULL,
 163             Mflag ? corefile : NULL, NULL, O_RDONLY, errbuf)) == NULL)
 164                 errx(1, "%s", errbuf);
 165         if (kvm_nlist(kd, nl) != 0 ||
 166             kvm_read(kd, nl[0].n_value, &version, sizeof(version)) == -1)
 167                 errx(1, "%s", kvm_geterr(kd));
 168         if (version != KTR_VERSION)
 169                 errx(1, "ktr version mismatch");
 170         if (iflag) {
 171                 if (fstat(in, &sb) == -1)
 172                         errx(1, "stat");
 173                 entries = sb.st_size / sizeof(*buf);
 174                 index = 0;
 175                 buf = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, in, 0);
 176                 if (buf == MAP_FAILED)
 177                         errx(1, "mmap");
 178         } else {
 179                 if (kvm_read(kd, nl[1].n_value, &entries, sizeof(entries))
 180                     == -1)
 181                         errx(1, "%s", kvm_geterr(kd));
 182                 if ((buf = malloc(sizeof(*buf) * entries)) == NULL)
 183                         err(1, NULL);
 184                 if (kvm_read(kd, nl[2].n_value, &index, sizeof(index)) == -1 ||
 185                     kvm_read(kd, nl[3].n_value, &bufptr,
 186                     sizeof(bufptr)) == -1 ||
 187                     kvm_read(kd, bufptr, buf, sizeof(*buf) * entries) == -1)
 188                         errx(1, "%s", kvm_geterr(kd));
 189         }
 190
 191         /*
 192          * Print a nice header.
 193          */
 194         if (!qflag) {
 195                 fprintf(out, "%-6s ", "index");
 196                 if (cflag)
 197                         fprintf(out, "%-3s ", "cpu");
 198                 if (tflag)
 199                         fprintf(out, "%-16s ", "timestamp");
 200                 if (fflag)
 201                         fprintf(out, "%-40s ", "file and line");
 202                 if (hflag)
 203                         fprintf(out, "%-18s ", "tid");
 204                 fprintf(out, "%s", "trace");
 205                 fprintf(out, "\n");
 206
 207                 fprintf(out, "------ ");
 208                 if (cflag)
 209                         fprintf(out, "--- ");
 210                 if (tflag)
 211                         fprintf(out, "---------------- ");
 212                 if (fflag)
 213                         fprintf(out,
 214                             "---------------------------------------- ");
 215                 if (hflag)
 216                         fprintf(out, "------------------ ");
 217                 fprintf(out, "----- ");
 218                 fprintf(out, "\n");
 219         }
 220
 221         /*
 222          * Now tear through the trace buffer.
 223          */
 224         if (!iflag)
 225                 i = (index - 1) % entries;
 226         tlast = -1;
 227         for (;;) {
 228                 if (buf[i].ktr_desc == NULL)
 229                         break;
 230                 if (kvm_read(kd, (u_long)buf[i].ktr_desc, desc,
 231                     sizeof(desc)) == -1)
 232                         errx(1, "%s", kvm_geterr(kd));
 233                 desc[sizeof(desc) - 1] = '\0';
 234                 parm = 0;
 235                 for (p = desc; (c = *p++) != '\0';) {
 236                         if (c != '%')
 237                                 continue;
 238 next:                   if ((c = *p++) == '\0')
 239                                 break;
 240                         if (parm == KTR_PARMS)
 241                                 errx(1, "too many parameters");
 242                         switch (c) {
 243                         case '0': case '1': case '2': case '3': case '4':
 244                         case '5': case '6': case '7': case '8': case '9':
 245                         case '#': case '-': case ' ': case '+': case '\'':
 246                         case 'h': case 'l': case 'j': case 't': case 'z':
 247                         case 'q': case 'L': case '.':
 248                                 goto next;
 249                         case 's':
 250                                 if (kvm_read(kd, (u_long)buf[i].ktr_parms[parm],
 251                                     sbuf[parm], sizeof(sbuf[parm])) == -1)
 252                                         strcpy(sbuf[parm], "(null)");
 253                                 sbuf[parm][sizeof(sbuf[0]) - 1] = '\0';
 254                                 parms[parm] = (u_long)sbuf[parm];
 255                                 parm++;
 256                                 break;
 257                         default:
 258                                 parms[parm] = buf[i].ktr_parms[parm];
 259                                 parm++;
 260                                 break;
 261                         }
 262                 }
 263                 fprintf(out, "%6d ", i);
 264                 if (cflag)
 265                         fprintf(out, "%3d ", buf[i].ktr_cpu);
 266                 if (tflag) {
 267                         tnow = (uintmax_t)buf[i].ktr_timestamp;
 268                         if (rflag) {
 269                                 if (tlast == -1)
 270                                         tlast = tnow;
 271                                 fprintf(out, "%16ju ", !iflag ? tlast - tnow :
 272                                     tnow - tlast);
 273                                 tlast = tnow;
 274                         } else
 275                                 fprintf(out, "%16ju ", tnow);
 276                 }
 277                 if (fflag) {
 278                         if (kvm_read(kd, (u_long)buf[i].ktr_file, fbuf,
 279                             sizeof(fbuf)) == -1)
 280                                 strcpy(fbuf, "(null)");
 281                         snprintf(obuf, sizeof(obuf), "%s:%d", fbuf,
 282                             buf[i].ktr_line);
 283                         fprintf(out, "%-40s ", obuf);
 284                 }
 285                 if (hflag)
 286                         fprintf(out, "%p ", buf[i].ktr_thread);
 287                 fprintf(out, desc, parms[0], parms[1], parms[2], parms[3],
 288                     parms[4], parms[5]);
 289                 fprintf(out, "\n");
 290                 if (!iflag) {
 291                         if (i == index)
 292                                 break;
 293                         i = (i - 1) % entries;
 294                 } else {
 295                         if (++i == entries)
 296                                 break;
 297                 }
 298         }
 299
 300         return (0);
 301 }
 302
 303 static void
 304 usage(void)
 305 {
 306
 307         fprintf(stderr, USAGE);
 308         exit(1);
 309 }