]> CyberLeo.Net >> Repos - FreeBSD/FreeBSD.git/blob - usr.bin/ktrdump/ktrdump.c
MFV of r270725, tzdata2014f
[FreeBSD/FreeBSD.git] / 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         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, index2;
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:o:")) != -1)
107                 switch (c) {
108                 case 'c':
109                         cflag = 1;
110                         break;
111                 case 'e':
112                         if (strlcpy(execfile, optarg, sizeof(execfile))
113                             >= sizeof(execfile))
114                                 errx(1, "%s: File name too long", optarg);
115                         eflag = 1;
116                         break;
117                 case 'f':
118                         fflag = 1;
119                         break;
120                 case 'i':
121                         iflag = 1;
122                         if ((in = open(optarg, O_RDONLY)) == -1)
123                                 err(1, "%s", optarg);
124                         break;
125                 case 'm':
126                         if (strlcpy(corefile, optarg, sizeof(corefile))
127                             >= sizeof(corefile))
128                                 errx(1, "%s: File name too long", optarg);
129                         mflag = 1;
130                         break;
131                 case 'o':
132                         if ((out = fopen(optarg, "w")) == NULL)
133                                 err(1, "%s", optarg);
134                         break;
135                 case 'q':
136                         qflag++;
137                         break;
138                 case 'r':
139                         rflag = 1;
140                         break;
141                 case 't':
142                         tflag = 1;
143                         break;
144                 case 'H':
145                         hflag = 1;
146                         break;
147                 case '?':
148                 default:
149                         usage();
150                 }
151         ac -= optind;
152         av += optind;
153         if (ac != 0)
154                 usage();
155
156         /*
157          * Open our execfile and corefile, resolve needed symbols and read in
158          * the trace buffer.
159          */
160         if ((kd = kvm_openfiles(eflag ? execfile : NULL,
161             mflag ? corefile : NULL, NULL, O_RDONLY, errbuf)) == NULL)
162                 errx(1, "%s", errbuf);
163         if (kvm_nlist(kd, nl) != 0 ||
164             kvm_read(kd, nl[0].n_value, &version, sizeof(version)) == -1)
165                 errx(1, "%s", kvm_geterr(kd));
166         if (version != KTR_VERSION)
167                 errx(1, "ktr version mismatch");
168         if (iflag) {
169                 if (fstat(in, &sb) == -1)
170                         errx(1, "stat");
171                 entries = sb.st_size / sizeof(*buf);
172                 index = 0;
173                 buf = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, in, 0);
174                 if (buf == MAP_FAILED)
175                         errx(1, "mmap");
176         } else {
177                 if (kvm_read(kd, nl[1].n_value, &entries, sizeof(entries))
178                     == -1)
179                         errx(1, "%s", kvm_geterr(kd));
180                 if ((buf = malloc(sizeof(*buf) * entries)) == NULL)
181                         err(1, NULL);
182                 if (kvm_read(kd, nl[2].n_value, &index, sizeof(index)) == -1 ||
183                     kvm_read(kd, nl[3].n_value, &bufptr,
184                     sizeof(bufptr)) == -1 ||
185                     kvm_read(kd, bufptr, buf, sizeof(*buf) * entries) == -1 ||
186                     kvm_read(kd, nl[2].n_value, &index2, sizeof(index2)) == -1)
187                         errx(1, "%s", kvm_geterr(kd));
188         }
189
190         /*
191          * Print a nice header.
192          */
193         if (!qflag) {
194                 fprintf(out, "%-6s ", "index");
195                 if (cflag)
196                         fprintf(out, "%-3s ", "cpu");
197                 if (tflag)
198                         fprintf(out, "%-16s ", "timestamp");
199                 if (fflag)
200                         fprintf(out, "%-40s ", "file and line");
201                 if (hflag)
202                         fprintf(out, "%-18s ", "tid");
203                 fprintf(out, "%s", "trace");
204                 fprintf(out, "\n");
205
206                 fprintf(out, "------ ");
207                 if (cflag)
208                         fprintf(out, "--- ");
209                 if (tflag)
210                         fprintf(out, "---------------- ");
211                 if (fflag)
212                         fprintf(out,
213                             "---------------------------------------- ");
214                 if (hflag)
215                         fprintf(out, "------------------ ");
216                 fprintf(out, "----- ");
217                 fprintf(out, "\n");
218         }
219
220         /*
221          * Now tear through the trace buffer.
222          */
223         if (!iflag) {
224                 i = index - 1;
225                 if (i < 0)
226                         i = entries - 1;
227         }
228         tlast = -1;
229         for (;;) {
230                 if (buf[i].ktr_desc == NULL)
231                         break;
232                 if (kvm_read(kd, (u_long)buf[i].ktr_desc, desc,
233                     sizeof(desc)) == -1)
234                         errx(1, "%s", kvm_geterr(kd));
235                 desc[sizeof(desc) - 1] = '\0';
236                 parm = 0;
237                 for (p = desc; (c = *p++) != '\0';) {
238                         if (c != '%')
239                                 continue;
240 next:                   if ((c = *p++) == '\0')
241                                 break;
242                         if (parm == KTR_PARMS)
243                                 errx(1, "too many parameters in \"%s\"", desc);
244                         switch (c) {
245                         case '0': case '1': case '2': case '3': case '4':
246                         case '5': case '6': case '7': case '8': case '9':
247                         case '#': case '-': case ' ': case '+': case '\'':
248                         case 'h': case 'l': case 'j': case 't': case 'z':
249                         case 'q': case 'L': case '.':
250                                 goto next;
251                         case 's':
252                                 if (kvm_read(kd, (u_long)buf[i].ktr_parms[parm],
253                                     sbuf[parm], sizeof(sbuf[parm])) == -1)
254                                         strcpy(sbuf[parm], "(null)");
255                                 sbuf[parm][sizeof(sbuf[0]) - 1] = '\0';
256                                 parms[parm] = (u_long)sbuf[parm];
257                                 parm++;
258                                 break;
259                         default:
260                                 parms[parm] = buf[i].ktr_parms[parm];
261                                 parm++;
262                                 break;
263                         }
264                 }
265                 fprintf(out, "%6d ", i);
266                 if (cflag)
267                         fprintf(out, "%3d ", buf[i].ktr_cpu);
268                 if (tflag) {
269                         tnow = (uintmax_t)buf[i].ktr_timestamp;
270                         if (rflag) {
271                                 if (tlast == -1)
272                                         tlast = tnow;
273                                 fprintf(out, "%16ju ", !iflag ? tlast - tnow :
274                                     tnow - tlast);
275                                 tlast = tnow;
276                         } else
277                                 fprintf(out, "%16ju ", tnow);
278                 }
279                 if (fflag) {
280                         if (kvm_read(kd, (u_long)buf[i].ktr_file, fbuf,
281                             sizeof(fbuf)) == -1)
282                                 strcpy(fbuf, "(null)");
283                         snprintf(obuf, sizeof(obuf), "%s:%d", fbuf,
284                             buf[i].ktr_line);
285                         fprintf(out, "%-40s ", obuf);
286                 }
287                 if (hflag)
288                         fprintf(out, "%p ", buf[i].ktr_thread);
289                 fprintf(out, desc, parms[0], parms[1], parms[2], parms[3],
290                     parms[4], parms[5]);
291                 fprintf(out, "\n");
292                 if (!iflag) {
293                         /*
294                          * 'index' and 'index2' are the values of 'ktr_idx'
295                          * before and after the KTR buffer was copied into
296                          * 'buf'. Since the KTR entries between 'index' and
297                          * 'index2' were in flux while the KTR buffer was
298                          * being copied to userspace we don't dump them.
299                          */
300                         if (i == index2)
301                                 break;
302                         if (--i < 0)
303                                 i = entries - 1;
304                 } else {
305                         if (++i == entries)
306                                 break;
307                 }
308         }
309
310         return (0);
311 }
312
313 static void
314 usage(void)
315 {
316
317         fprintf(stderr, USAGE);
318         exit(1);
319 }