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] [-e execfile] [-i ktrfile] [-m corefile] [-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 eflag;
  63 static int fflag;
  64 static int mflag;
  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         struct stat sb;
  90         kvm_t *kd;
  91         FILE *out;
  92         char *p;
  93         int version;
  94         int entries;
  95         int index;
  96         int parm;
  97         int in;
  98         int c;
  99         int i = 0;
 100
 101         /*
 102          * Parse commandline arguments.
 103          */
 104         out = stdout;
 105         while ((c = getopt(ac, av, "cfqrtHe:i:m:o:")) != -1)
 106                 switch (c) {
 107                 case 'c':
 108                         cflag = 1;
 109                         break;
 110                 case 'e':
 111                         if (strlcpy(execfile, optarg, sizeof(execfile))
 112                             >= sizeof(execfile))
 113                                 errx(1, "%s: File name too long", optarg);
 114                         eflag = 1;
 115                         break;
 116                 case 'f':
 117                         fflag = 1;
 118                         break;
 119                 case 'i':
 120                         iflag = 1;
 121                         if ((in = open(optarg, O_RDONLY)) == -1)
 122                                 err(1, "%s", optarg);
 123                         break;
 124                 case 'm':
 125                         if (strlcpy(corefile, optarg, sizeof(corefile))
 126                             >= sizeof(corefile))
 127                                 errx(1, "%s: File name too long", optarg);
 128                         mflag = 1;
 129                         break;
 130                 case 'o':
 131                         if ((out = fopen(optarg, "w")) == NULL)
 132                                 err(1, "%s", optarg);
 133                         break;
 134                 case 'q':
 135                         qflag++;
 136                         break;
 137                 case 'r':
 138                         rflag = 1;
 139                         break;
 140                 case 't':
 141                         tflag = 1;
 142                         break;
 143                 case 'H':
 144                         hflag = 1;
 145                         break;
 146                 case '?':
 147                 default:
 148                         usage();
 149                 }
 150         ac -= optind;
 151         av += optind;
 152         if (ac != 0)
 153                 usage();
 154
 155         /*
 156          * Open our execfile and corefile, resolve needed symbols and read in
 157          * the trace buffer.
 158          */
 159         if ((kd = kvm_openfiles(eflag ? execfile : NULL,
 160             mflag ? corefile : NULL, NULL, O_RDONLY, errbuf)) == NULL)
 161                 errx(1, "%s", errbuf);
 162         if (kvm_nlist(kd, nl) != 0 ||
 163             kvm_read(kd, nl[0].n_value, &version, sizeof(version)) == -1)
 164                 errx(1, "%s", kvm_geterr(kd));
 165         if (version != KTR_VERSION)
 166                 errx(1, "ktr version mismatch");
 167         if (iflag) {
 168                 if (fstat(in, &sb) == -1)
 169                         errx(1, "stat");
 170                 entries = sb.st_size / sizeof(*buf);
 171                 index = 0;
 172                 buf = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, in, 0);
 173                 if (buf == MAP_FAILED)
 174                         errx(1, "mmap");
 175         } else {
 176                 if (kvm_read(kd, nl[1].n_value, &entries, sizeof(entries))
 177                     == -1)
 178                         errx(1, "%s", kvm_geterr(kd));
 179                 if ((buf = malloc(sizeof(*buf) * entries)) == NULL)
 180                         err(1, NULL);
 181                 if (kvm_read(kd, nl[2].n_value, &index, sizeof(index)) == -1 ||
 182                     kvm_read(kd, nl[3].n_value, buf, sizeof(*buf) * entries)
 183                     == -1)
 184                         errx(1, "%s", kvm_geterr(kd));
 185         }
 186
 187         /*
 188          * Print a nice header.
 189          */
 190         if (!qflag) {
 191                 fprintf(out, "%-6s ", "index");
 192                 if (cflag)
 193                         fprintf(out, "%-3s ", "cpu");
 194                 if (tflag)
 195                         fprintf(out, "%-16s ", "timestamp");
 196                 if (fflag)
 197                         fprintf(out, "%-40s ", "file and line");
 198                 if (hflag)
 199                         fprintf(out, "%-18s ", "tid");
 200                 fprintf(out, "%s", "trace");
 201                 fprintf(out, "\n");
 202
 203                 fprintf(out, "------ ");
 204                 if (cflag)
 205                         fprintf(out, "--- ");
 206                 if (tflag)
 207                         fprintf(out, "---------------- ");
 208                 if (fflag)
 209                         fprintf(out,
 210                             "---------------------------------------- ");
 211                 if (hflag)
 212                         fprintf(out, "------------------ ");
 213                 fprintf(out, "----- ");
 214                 fprintf(out, "\n");
 215         }
 216
 217         /*
 218          * Now tear through the trace buffer.
 219          */
 220         if (!iflag)
 221                 i = (index - 1) % entries;
 222         tlast = -1;
 223         for (;;) {
 224                 if (buf[i].ktr_desc == NULL)
 225                         break;
 226                 if (kvm_read(kd, (u_long)buf[i].ktr_desc, desc,
 227                     sizeof(desc)) == -1)
 228                         errx(1, "%s", kvm_geterr(kd));
 229                 desc[sizeof(desc) - 1] = '\0';
 230                 parm = 0;
 231                 for (p = desc; (c = *p++) != '\0';) {
 232                         if (c != '%')
 233                                 continue;
 234 next:                   if ((c = *p++) == '\0')
 235                                 break;
 236                         if (parm == KTR_PARMS)
 237                                 errx(1, "too many parameters");
 238                         switch (c) {
 239                         case '0': case '1': case '2': case '3': case '4':
 240                         case '5': case '6': case '7': case '8': case '9':
 241                         case '#': case '-': case ' ': case '+': case '\'':
 242                         case 'h': case 'l': case 'j': case 't': case 'z':
 243                         case 'q': case 'L': case '.':
 244                                 goto next;
 245                         case 's':
 246                                 if (kvm_read(kd, (u_long)buf[i].ktr_parms[parm],
 247                                     sbuf[parm], sizeof(sbuf[parm])) == -1)
 248                                         strcpy(sbuf[parm], "(null)");
 249                                 sbuf[parm][sizeof(sbuf[0]) - 1] = '\0';
 250                                 parms[parm] = (u_long)sbuf[parm];
 251                                 parm++;
 252                                 break;
 253                         default:
 254                                 parms[parm] = buf[i].ktr_parms[parm];
 255                                 parm++;
 256                                 break;
 257                         }
 258                 }
 259                 fprintf(out, "%6d ", i);
 260                 if (cflag)
 261                         fprintf(out, "%3d ", buf[i].ktr_cpu);
 262                 if (tflag) {
 263                         tnow = (uintmax_t)buf[i].ktr_timestamp;
 264                         if (rflag) {
 265                                 if (tlast == -1)
 266                                         tlast = tnow;
 267                                 fprintf(out, "%16ju ", !iflag ? tlast - tnow :
 268                                     tnow - tlast);
 269                                 tlast = tnow;
 270                         } else
 271                                 fprintf(out, "%16ju ", tnow);
 272                 }
 273                 if (fflag) {
 274                         if (kvm_read(kd, (u_long)buf[i].ktr_file, fbuf,
 275                             sizeof(fbuf)) == -1)
 276                                 strcpy(fbuf, "(null)");
 277                         snprintf(obuf, sizeof(obuf), "%s:%d", fbuf,
 278                             buf[i].ktr_line);
 279                         fprintf(out, "%-40s ", obuf);
 280                 }
 281                 if (hflag)
 282                         fprintf(out, "%p ", buf[i].ktr_thread);
 283                 fprintf(out, desc, parms[0], parms[1], parms[2], parms[3],
 284                     parms[4], parms[5]);
 285                 fprintf(out, "\n");
 286                 if (!iflag) {
 287                         if (i == index)
 288                                 break;
 289                         i = (i - 1) % entries;
 290                 } else {
 291                         if (++i == entries)
 292                                 break;
 293                 }
 294         }
 295
 296         return (0);
 297 }
 298
 299 static void
 300 usage(void)
 301 {
 302
 303         fprintf(stderr, USAGE);
 304         exit(1);
 305 }