ktrdump is a utility to dump the ktr trace buffer from userland. It can
also be run on a core dump.
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jake
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7
usr.bin/ktrdump/Makefile
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7
usr.bin/ktrdump/Makefile
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# $FreeBSD$
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PROG= ktrdump
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NOMAN=
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LDADD= -lkvm
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.include <bsd.prog.mk>
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236
usr.bin/ktrdump/ktrdump.c
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usr.bin/ktrdump/ktrdump.c
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/*-
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* Copyright (c) 2002 Jake Burkholder
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/ktr.h>
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#include <err.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <limits.h>
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#include <nlist.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define SBUFLEN 128
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#define USAGE \
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"usage: ktrdump [-c] [-f] [-t] [-e execfile] [-m corefile] [-o outfile]"
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extern char *optarg;
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extern int optind;
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static void usage(void);
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static struct nlist nl[] = {
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{ "_ktr_version" },
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{ "_ktr_entries" },
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{ "_ktr_idx" },
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{ "_ktr_buf" },
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{ NULL }
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};
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static int cflag;
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static int eflag;
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static int fflag;
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static int mflag;
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static int tflag;
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static char corefile[PATH_MAX];
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static char execfile[PATH_MAX];
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static char desc[SBUFLEN];
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static char errbuf[_POSIX2_LINE_MAX];
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static char fbuf[PATH_MAX];
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static char obuf[PATH_MAX];
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static char sbuf[KTR_PARMS][SBUFLEN];
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/*
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* Reads the ktr trace buffer from kernel memory and prints the trace entries.
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*/
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int
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main(int ac, char **av)
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{
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u_long parms[KTR_PARMS];
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struct ktr_entry *buf;
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kvm_t *kd;
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FILE *out;
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char *p;
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int version;
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int entries;
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int index;
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int parm;
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int c;
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int i;
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int n;
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/*
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* Parse commandline arguments.
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*/
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out = stdout;
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while ((c = getopt(ac, av, "cfte:m:o:")) != -1)
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switch (c) {
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case 'c':
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cflag = 1;
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break;
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case 'e':
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strcpy(optarg, execfile);
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eflag = 1;
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break;
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case 'f':
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fflag = 1;
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break;
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case 'm':
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strcpy(optarg, corefile);
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mflag = 1;
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break;
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case 'o':
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if ((out = fopen(optarg, "w")) == NULL)
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err(1, "%s", optarg);
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break;
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case 't':
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tflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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ac -= optind;
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av += optind;
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if (ac != 0)
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usage();
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/*
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* Open our execfile and corefile, resolve needed symbols and read in
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* the trace buffer.
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*/
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if ((kd = kvm_openfiles(eflag ? execfile : NULL,
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mflag ? corefile : NULL, NULL, O_RDONLY, errbuf)) == NULL)
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errx(1, "%s", errbuf);
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if (kvm_nlist(kd, nl) != 0 ||
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kvm_read(kd, nl[0].n_value, &version, sizeof(version)) == -1)
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errx(1, "%s", kvm_geterr(kd));
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if (version != KTR_VERSION)
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errx(1, "ktr version mismatch");
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if (kvm_read(kd, nl[1].n_value, &entries, sizeof(entries)) == -1)
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errx(1, "%s", kvm_geterr(kd));
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if ((buf = malloc(sizeof(*buf) * entries)) == NULL)
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err(1, NULL);
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if (kvm_read(kd, nl[2].n_value, &index, sizeof(index)) == -1 ||
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kvm_read(kd, nl[3].n_value, buf, sizeof(*buf) * entries) == -1)
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errx(1, "%s", kvm_geterr(kd));
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/*
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* Print a nice header.
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*/
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fprintf(out, "%-6s ", "index");
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if (cflag)
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fprintf(out, "%-3s ", "cpu");
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if (tflag)
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fprintf(out, "%-16s ", "timestamp");
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if (fflag)
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fprintf(out, "%-32s ", "file and line");
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fprintf(out, "%s", "trace");
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fprintf(out, "\n");
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fprintf(out, "------ ");
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if (cflag)
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fprintf(out, "--- ");
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if (tflag)
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fprintf(out, "---------------- ");
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if (fflag)
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fprintf(out, "---------------------------------------- ");
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fprintf(out, "----- ");
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fprintf(out, "\n");
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/*
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* Now tear through the trace buffer.
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*/
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i = (index - 1) & (entries - 1);
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for (;;) {
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if (buf[i].ktr_desc == NULL)
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break;
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if (kvm_read(kd, (u_long)buf[i].ktr_desc, desc,
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sizeof(desc)) == -1)
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errx(1, "%s", kvm_geterr(kd));
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desc[sizeof(desc) - 1] = '\0';
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parm = 0;
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for (p = desc; (c = *p++) != '\0';) {
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if (c != '%')
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continue;
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if ((c = *p++) == '\0')
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break;
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if (parm == KTR_PARMS)
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errx(1, "too many parameters");
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switch (c) {
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case 's':
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if (kvm_read(kd, (u_long)buf[i].ktr_parms[parm],
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sbuf[parm], sizeof(sbuf[parm])) == -1)
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strcpy(sbuf[parm], "(null)");
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sbuf[parm][sizeof(sbuf[0]) - 1] = '\0';
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parms[parm] = (u_long)sbuf[parm];
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parm++;
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break;
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default:
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parms[parm] = buf[i].ktr_parms[parm];
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parm++;
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break;
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}
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}
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fprintf(out, "%6d ", i);
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if (cflag)
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fprintf(out, "%3d ", buf[i].ktr_cpu);
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if (tflag)
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fprintf(out, "%16ju ",
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(uintmax_t)buf[i].ktr_timestamp);
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if (fflag) {
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if (kvm_read(kd, (u_long)buf[i].ktr_file, fbuf,
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sizeof(fbuf)) == -1)
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strcpy(fbuf, "(null)");
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snprintf(obuf, sizeof(obuf), "%s:%d", fbuf,
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buf[i].ktr_line);
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fprintf(out, "%-40s ", obuf);
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}
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fprintf(out, desc, parms[0], parms[1], parms[2], parms[3],
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parms[4], parms[5]);
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fprintf(out, "\n");
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if (i == index)
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break;
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i = (i - 1) & (entries - 1);
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}
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return (0);
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}
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static void
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usage(void)
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{
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errx(1, USAGE);
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}
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