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author | jake <jake@FreeBSD.org> | 2002-04-01 05:41:13 +0000 |
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committer | jake <jake@FreeBSD.org> | 2002-04-01 05:41:13 +0000 |
commit | ead60301646a22ed9af4f24a5946e69e2e92a46c (patch) | |
tree | 3a670140890b0889f6fb21fd35b5186ac5ddda3d /usr.bin/ktrdump/ktrdump.c | |
parent | f9f52274db8c5c9f808b66146813a7c7adf790fc (diff) | |
download | FreeBSD-src-ead60301646a22ed9af4f24a5946e69e2e92a46c.zip FreeBSD-src-ead60301646a22ed9af4f24a5946e69e2e92a46c.tar.gz |
ktrdump is a utility to dump the ktr trace buffer from userland. It can
also be run on a core dump.
Diffstat (limited to 'usr.bin/ktrdump/ktrdump.c')
-rw-r--r-- | usr.bin/ktrdump/ktrdump.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/usr.bin/ktrdump/ktrdump.c b/usr.bin/ktrdump/ktrdump.c new file mode 100644 index 0000000..a25ebab --- /dev/null +++ b/usr.bin/ktrdump/ktrdump.c @@ -0,0 +1,236 @@ +/*- + * Copyright (c) 2002 Jake Burkholder + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <sys/ktr.h> + +#include <err.h> +#include <fcntl.h> +#include <kvm.h> +#include <limits.h> +#include <nlist.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#define SBUFLEN 128 +#define USAGE \ + "usage: ktrdump [-c] [-f] [-t] [-e execfile] [-m corefile] [-o outfile]" + +extern char *optarg; +extern int optind; + +static void usage(void); + +static struct nlist nl[] = { + { "_ktr_version" }, + { "_ktr_entries" }, + { "_ktr_idx" }, + { "_ktr_buf" }, + { NULL } +}; + +static int cflag; +static int eflag; +static int fflag; +static int mflag; +static int tflag; + +static char corefile[PATH_MAX]; +static char execfile[PATH_MAX]; + +static char desc[SBUFLEN]; +static char errbuf[_POSIX2_LINE_MAX]; +static char fbuf[PATH_MAX]; +static char obuf[PATH_MAX]; +static char sbuf[KTR_PARMS][SBUFLEN]; + +/* + * Reads the ktr trace buffer from kernel memory and prints the trace entries. + */ +int +main(int ac, char **av) +{ + u_long parms[KTR_PARMS]; + struct ktr_entry *buf; + kvm_t *kd; + FILE *out; + char *p; + int version; + int entries; + int index; + int parm; + int c; + int i; + int n; + + /* + * Parse commandline arguments. + */ + out = stdout; + while ((c = getopt(ac, av, "cfte:m:o:")) != -1) + switch (c) { + case 'c': + cflag = 1; + break; + case 'e': + strcpy(optarg, execfile); + eflag = 1; + break; + case 'f': + fflag = 1; + break; + case 'm': + strcpy(optarg, corefile); + mflag = 1; + break; + case 'o': + if ((out = fopen(optarg, "w")) == NULL) + err(1, "%s", optarg); + break; + case 't': + tflag = 1; + break; + case '?': + default: + usage(); + } + ac -= optind; + av += optind; + if (ac != 0) + usage(); + + /* + * Open our execfile and corefile, resolve needed symbols and read in + * the trace buffer. + */ + if ((kd = kvm_openfiles(eflag ? execfile : NULL, + mflag ? corefile : NULL, NULL, O_RDONLY, errbuf)) == NULL) + errx(1, "%s", errbuf); + if (kvm_nlist(kd, nl) != 0 || + kvm_read(kd, nl[0].n_value, &version, sizeof(version)) == -1) + errx(1, "%s", kvm_geterr(kd)); + if (version != KTR_VERSION) + errx(1, "ktr version mismatch"); + if (kvm_read(kd, nl[1].n_value, &entries, sizeof(entries)) == -1) + errx(1, "%s", kvm_geterr(kd)); + if ((buf = malloc(sizeof(*buf) * entries)) == NULL) + err(1, NULL); + if (kvm_read(kd, nl[2].n_value, &index, sizeof(index)) == -1 || + kvm_read(kd, nl[3].n_value, buf, sizeof(*buf) * entries) == -1) + errx(1, "%s", kvm_geterr(kd)); + + /* + * Print a nice header. + */ + fprintf(out, "%-6s ", "index"); + if (cflag) + fprintf(out, "%-3s ", "cpu"); + if (tflag) + fprintf(out, "%-16s ", "timestamp"); + if (fflag) + fprintf(out, "%-32s ", "file and line"); + fprintf(out, "%s", "trace"); + fprintf(out, "\n"); + + fprintf(out, "------ "); + if (cflag) + fprintf(out, "--- "); + if (tflag) + fprintf(out, "---------------- "); + if (fflag) + fprintf(out, "---------------------------------------- "); + fprintf(out, "----- "); + fprintf(out, "\n"); + + /* + * Now tear through the trace buffer. + */ + i = (index - 1) & (entries - 1); + for (;;) { + if (buf[i].ktr_desc == NULL) + break; + if (kvm_read(kd, (u_long)buf[i].ktr_desc, desc, + sizeof(desc)) == -1) + errx(1, "%s", kvm_geterr(kd)); + desc[sizeof(desc) - 1] = '\0'; + parm = 0; + for (p = desc; (c = *p++) != '\0';) { + if (c != '%') + continue; + if ((c = *p++) == '\0') + break; + if (parm == KTR_PARMS) + errx(1, "too many parameters"); + switch (c) { + case 's': + if (kvm_read(kd, (u_long)buf[i].ktr_parms[parm], + sbuf[parm], sizeof(sbuf[parm])) == -1) + strcpy(sbuf[parm], "(null)"); + sbuf[parm][sizeof(sbuf[0]) - 1] = '\0'; + parms[parm] = (u_long)sbuf[parm]; + parm++; + break; + default: + parms[parm] = buf[i].ktr_parms[parm]; + parm++; + break; + } + } + fprintf(out, "%6d ", i); + if (cflag) + fprintf(out, "%3d ", buf[i].ktr_cpu); + if (tflag) + fprintf(out, "%16ju ", + (uintmax_t)buf[i].ktr_timestamp); + if (fflag) { + if (kvm_read(kd, (u_long)buf[i].ktr_file, fbuf, + sizeof(fbuf)) == -1) + strcpy(fbuf, "(null)"); + snprintf(obuf, sizeof(obuf), "%s:%d", fbuf, + buf[i].ktr_line); + fprintf(out, "%-40s ", obuf); + } + fprintf(out, desc, parms[0], parms[1], parms[2], parms[3], + parms[4], parms[5]); + fprintf(out, "\n"); + if (i == index) + break; + i = (i - 1) & (entries - 1); + } + + return (0); +} + +static void +usage(void) +{ + errx(1, USAGE); +} |