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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 "busybox.h"
#include <sys/syslog.h>
#include <sys/klog.h>
static void klogd_signal(int sig ATTRIBUTE_UNUSED)
{
klogctl(7, NULL, 0);
klogctl(0, 0, 0);
syslog(LOG_NOTICE, "Kernel log daemon exiting");
exit(EXIT_SUCCESS);
}
#define OPT_LEVEL 1
#define OPT_FOREGROUND 2
#define KLOGD_LOGBUF_SIZE BUFSIZ
#define log_buffer bb_common_bufsiz1
int klogd_main(int argc, char **argv);
int klogd_main(int argc, char **argv)
{
int i = i; /* silence gcc */
char *start;
/* do normal option parsing */
getopt32(argc, argv, "c:n", &start);
if (option_mask32 & OPT_LEVEL) {
/* Valid levels are between 1 and 8 */
i = xatoul_range(start, 1, 8);
}
if (!(option_mask32 & OPT_FOREGROUND)) {
bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
}
openlog("kernel", 0, LOG_KERN);
/* Set up sig handlers */
signal(SIGINT, klogd_signal);
signal(SIGKILL, klogd_signal);
signal(SIGTERM, klogd_signal);
signal(SIGHUP, SIG_IGN);
/* "Open the log. Currently a NOP." */
klogctl(1, NULL, 0);
/* Set level of kernel console messaging. */
if (option_mask32 & OPT_LEVEL)
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;
n = klogctl(2, log_buffer, KLOGD_LOGBUF_SIZE - 1);
if (n < 0) {
if (errno == EINTR)
continue;
syslog(LOG_ERR, "klogd: error from klogctl(2): %d - %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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