3447a66db8
copied to userspace. Failing to do this would result in entries at the bottom of the ktrdump output to be more recent than entries at the top. With this change the timestamps are monotonically decreasing going from the top to the bottom of the ktrdump output.
320 lines
7.7 KiB
C
320 lines
7.7 KiB
C
/*-
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* Copyright (c) 2002 Jake Burkholder
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* Copyright (c) 2004 Robert Watson
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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 <sys/mman.h>
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#include <sys/stat.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 <stdint.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 [-cfqrtH] [-e execfile] [-i ktrfile] [-m corefile] [-o outfile]\n"
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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 qflag;
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static int rflag;
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static int tflag;
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static int iflag;
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static int hflag;
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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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uintmax_t tlast, tnow;
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unsigned long bufptr;
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struct stat sb;
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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, index2;
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int parm;
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int in;
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int c;
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int i = 0;
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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, "cfqrtHe:i: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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if (strlcpy(execfile, optarg, sizeof(execfile))
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>= sizeof(execfile))
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errx(1, "%s: File name too long", optarg);
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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 'i':
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iflag = 1;
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if ((in = open(optarg, O_RDONLY)) == -1)
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err(1, "%s", optarg);
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break;
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case 'm':
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if (strlcpy(corefile, optarg, sizeof(corefile))
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>= sizeof(corefile))
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errx(1, "%s: File name too long", optarg);
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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 'q':
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qflag++;
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break;
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case 'r':
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rflag = 1;
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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 'H':
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hflag = 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 (iflag) {
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if (fstat(in, &sb) == -1)
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errx(1, "stat");
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entries = sb.st_size / sizeof(*buf);
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index = 0;
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buf = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, in, 0);
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if (buf == MAP_FAILED)
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errx(1, "mmap");
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} else {
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if (kvm_read(kd, nl[1].n_value, &entries, sizeof(entries))
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== -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, &bufptr,
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sizeof(bufptr)) == -1 ||
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kvm_read(kd, bufptr, buf, sizeof(*buf) * entries) == -1 ||
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kvm_read(kd, nl[2].n_value, &index2, sizeof(index2)) == -1)
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errx(1, "%s", kvm_geterr(kd));
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}
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/*
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* Print a nice header.
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*/
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if (!qflag) {
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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, "%-40s ", "file and line");
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if (hflag)
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fprintf(out, "%-18s ", "tid");
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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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"---------------------------------------- ");
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if (hflag)
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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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/*
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* Now tear through the trace buffer.
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*/
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if (!iflag) {
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i = index - 1;
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if (i < 0)
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i = entries - 1;
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}
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tlast = -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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next: 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 in \"%s\"", desc);
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switch (c) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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case '#': case '-': case ' ': case '+': case '\'':
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case 'h': case 'l': case 'j': case 't': case 'z':
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case 'q': case 'L': case '.':
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goto next;
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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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tnow = (uintmax_t)buf[i].ktr_timestamp;
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if (rflag) {
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if (tlast == -1)
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tlast = tnow;
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fprintf(out, "%16ju ", !iflag ? tlast - tnow :
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tnow - tlast);
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tlast = tnow;
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} else
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fprintf(out, "%16ju ", tnow);
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}
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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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if (hflag)
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fprintf(out, "%p ", buf[i].ktr_thread);
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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 (!iflag) {
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/*
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* 'index' and 'index2' are the values of 'ktr_idx'
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* before and after the KTR buffer was copied into
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* 'buf'. Since the KTR entries between 'index' and
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* 'index2' were in flux while the KTR buffer was
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* being copied to userspace we don't dump them.
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*/
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if (i == index2)
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break;
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if (--i < 0)
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i = entries - 1;
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} else {
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if (++i == entries)
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break;
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}
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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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fprintf(stderr, USAGE);
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exit(1);
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}
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