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/* Take a snap shot of ksyms and modules for Oops debugging
Copyright 1999 Linux International.
Contributed by Keith Owens <kaos@ocs.com.au>
This file is part of the Linux modutils.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ident "$Id$"
#include <errno.h>
#include <stdio.h>
#include <stdarg.h>
#include <time.h>
#include <unistd.h>
#include <string.h>
#include "module.h"
#include "obj.h"
#include "modstat.h"
#include "util.h"
static char snap_dir[] = "/var/log/ksymoops";
/* If snap_dir exists, take a snap shot of ksyms and modules to snap_dir.
* Prefix the files with the equivalent of
* date +%Y%m%d%T%M%S | sed -e 's/://g'
*/
void snap_shot(const char *module_names, int n_module_names)
{
char file[] = "ccyymmddhhmmss.modules", buffer[4096];
static char *infile[] = { "/proc/ksyms", "/proc/modules" };
static char *suffix[] = { "ksyms", "modules" };
struct tm *local;
time_t t;
int i, l;
FILE *in, *out;
if (module_names) {
/* Only snap shot if the list of modules has changed.
* Otherwise auto cleanup takes a snap shot every time
* and ends up with a large snap shot directory.
*/
char *new_module_names;
size_t n_new_module_names;
get_kernel_info(0);
new_module_names = module_name_list;
n_new_module_names = n_module_stat;
if (n_module_names && n_new_module_names == n_module_names) {
while (n_module_names) {
if (strcmp(module_names, new_module_names))
break; /* difference detected */
i = strlen(module_names) + 1;
module_names += i;
new_module_names += i;
--n_module_names;
}
}
if (!n_module_names)
return; /* no difference, no need for snap shot */
}
if (chdir(snap_dir))
return;
t = time(NULL);
local = localtime(&t);
for (i = 0; i < sizeof(infile)/sizeof(infile[0]); ++i) {
snprintf(file, sizeof(file), "%04d%02d%02d%02d%02d%02d.%s",
local->tm_year+1900,
local->tm_mon + 1,
local->tm_mday,
local->tm_hour,
local->tm_min,
local->tm_sec,
suffix[i]);
out = fopen(file, "w");
if (!out) {
error("cannot create %s/%s %m", snap_dir, file);
return;
}
in = fopen(infile[i], "r");
if (!in) {
error("cannot open %s %m", infile[i]);
return;
}
while ((l = fread(buffer, 1, sizeof(buffer), in)) > 0) {
if (fwrite(buffer, l, 1, out) != 1) {
error("unable to write to %s %m", file);
fclose(in);
fclose(out);
return;
}
}
if (ferror(in))
error("unable to read from %s %m", infile[i]);
fclose(in);
fclose(out);
}
}
/* If snap_dir exists, log a message to snap_dir. The log file is called the
* equivalent of date +%Y%m%d | sed -e 's/://g'. Each line is prefixed with
* timestamp down to seconds and followed by a newline.
*/
void snap_shot_log(const char *fmt,...)
{
char date[] = "ccyymmdd", file[] = "ccyymmdd.log", stamp[] = "ccyymmdd hhmmss";
struct tm *local;
time_t t;
FILE *log;
va_list args;
int save_errno = errno;
if (chdir(snap_dir))
return;
t = time(NULL);
local = localtime(&t);
snprintf(date, sizeof(date), "%04d%02d%02d",
local->tm_year+1900,
local->tm_mon + 1,
local->tm_mday);
snprintf(file, sizeof(file), "%s.log", date);
log = fopen(file, "a");
if (!log) {
error("cannot create %s/%s %m", snap_dir, file);
return;
}
snprintf(stamp, sizeof(stamp), "%s %02d%02d%02d",
date,
local->tm_hour,
local->tm_min,
local->tm_sec);
fprintf(log, "%s ", stamp);
va_start(args, fmt);
errno = save_errno; /* fmt may use %m */
vfprintf(log, fmt, args);
va_end(args);
fprintf(log, "\n");
fclose(log);
}
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