129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
/* 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 4096
|
|
|
|
int klogd_main(int argc, char **argv);
|
|
int klogd_main(int argc, char **argv)
|
|
{
|
|
RESERVE_CONFIG_BUFFER(log_buffer, KLOGD_LOGBUF_SIZE);
|
|
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)) {
|
|
#ifdef BB_NOMMU
|
|
vfork_daemon_rexec(0, 1, argc, argv, "-n");
|
|
#else
|
|
xdaemon(0, 1);
|
|
#endif
|
|
}
|
|
|
|
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);
|
|
|
|
while (1) {
|
|
int n;
|
|
int priority;
|
|
char lastc;
|
|
|
|
/* Use kernel syscalls */
|
|
memset(log_buffer, '\0', KLOGD_LOGBUF_SIZE);
|
|
/* It will be null-terminted */
|
|
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;
|
|
}
|
|
|
|
/* klogctl buffer parsing modelled after code in dmesg.c */
|
|
start = &log_buffer[0];
|
|
lastc = '\0';
|
|
priority = LOG_INFO;
|
|
for (i = 0; i < n; i++) {
|
|
if (lastc == '\0' && 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];
|
|
}
|
|
if (log_buffer[i] == '\n') {
|
|
log_buffer[i] = '\0'; /* zero terminate this message */
|
|
syslog(priority, "%s", start);
|
|
start = &log_buffer[i + 1];
|
|
priority = LOG_INFO;
|
|
}
|
|
lastc = log_buffer[i];
|
|
}
|
|
}
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
RELEASE_CONFIG_BUFFER(log_buffer);
|
|
|
|
return EXIT_FAILURE;
|
|
}
|