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/* vi: set sw=4 ts=4: */
/*
* Mini klogd implementation for busybox
*
* Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>.
* Changes: Made this a standalone busybox module which uses standalone
* syslog() client interface.
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
*
* "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@gena01.com>
*
* Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#include "libbb.h"
#include <syslog.h>
#include <sys/klog.h>
static void klogd_signal(int sig)
{
/* FYI: cmd 7 is equivalent to setting console_loglevel to 7
* via klogctl(8, NULL, 7). */
klogctl(7, NULL, 0); /* "7 -- Enable printk's to console" */
klogctl(0, NULL, 0); /* "0 -- Close the log. Currently a NOP" */
syslog(LOG_NOTICE, "klogd: exiting");
kill_myself_with_sig(sig);
}
#define log_buffer bb_common_bufsiz1
enum {
KLOGD_LOGBUF_SIZE = sizeof(log_buffer),
OPT_LEVEL = (1 << 0),
OPT_FOREGROUND = (1 << 1),
};
int klogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int klogd_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
int i = 0;
char *start;
int opt;
opt = getopt32(argv, "c:n", &start);
if (opt & OPT_LEVEL) {
/* Valid levels are between 1 and 8 */
i = xatou_range(start, 1, 8);
}
if (!(opt & OPT_FOREGROUND)) {
bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
}
openlog("kernel", 0, LOG_KERN);
bb_signals(0
+ (1 << SIGINT)
+ (1 << SIGTERM)
, klogd_signal);
signal(SIGHUP, SIG_IGN);
/* "Open the log. Currently a NOP" */
klogctl(1, NULL, 0);
/* "printk() prints a message on the console only if it has a loglevel
* less than console_loglevel". Here we set console_loglevel = i. */
if (i)
klogctl(8, NULL, i);
syslog(LOG_NOTICE, "klogd started: %s", bb_banner);
/* Note: this code does not detect incomplete messages
* (messages not ending with '\n' or just when kernel
* generates too many messages for us to keep up)
* and will split them in two separate lines */
while (1) {
int n;
int priority;
/* "2 -- Read from the log." */
n = klogctl(2, log_buffer, KLOGD_LOGBUF_SIZE - 1);
if (n < 0) {
if (errno == EINTR)
continue;
syslog(LOG_ERR, "klogd: error %d in klogctl(2): %m",
errno);
break;
}
log_buffer[n] = '\n';
i = 0;
while (i < n) {
priority = LOG_INFO;
start = &log_buffer[i];
if (log_buffer[i] == '<') {
i++;
// kernel never ganerates multi-digit prios
//priority = 0;
//while (log_buffer[i] >= '0' && log_buffer[i] <= '9') {
// priority = priority * 10 + (log_buffer[i] - '0');
// i++;
//}
if (isdigit(log_buffer[i])) {
priority = (log_buffer[i] - '0');
i++;
}
if (log_buffer[i] == '>')
i++;
start = &log_buffer[i];
}
while (log_buffer[i] != '\n')
i++;
log_buffer[i] = '\0';
syslog(priority, "%s", start);
i++;
}
}
return EXIT_FAILURE;
}
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