1 /* vi: set sw=4 ts=4: */
3 * Mini klogd implementation for busybox
5 * Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>.
6 * Changes: Made this a standalone busybox module which uses standalone
7 * syslog() client interface.
9 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
11 * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
13 * "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@gena01.com>
15 * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
17 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
23 #include <signal.h> /* for our signal() handlers */
24 #include <string.h> /* strncpy() */
25 #include <errno.h> /* errno and friends */
28 #include <sys/syslog.h>
31 static void klogd_signal(int sig ATTRIBUTE_UNUSED)
35 /* logMessage(0, "Kernel log daemon exiting."); */
36 syslog(LOG_NOTICE, "Kernel log daemon exiting.");
41 #define OPT_FOREGROUND 2
43 #define KLOGD_LOGBUF_SIZE 4096
45 int klogd_main(int argc, char **argv)
47 RESERVE_CONFIG_BUFFER(log_buffer, KLOGD_LOGBUF_SIZE);
48 int console_log_level = -1;
49 int priority = LOG_INFO;
57 /* do normal option parsing */
58 opt = bb_getopt_ulflags(argc, argv, "c:n", &start);
60 if (opt & OPT_LEVEL) {
61 /* Valid levels are between 1 and 8 */
62 console_log_level = bb_xgetlarg(start, 10, 1, 8);
65 if (!(opt & OPT_FOREGROUND)) {
67 vfork_daemon_rexec(0, 1, argc, argv, "-n");
74 openlog("kernel", 0, LOG_KERN);
76 /* Set up sig handlers */
77 signal(SIGINT, klogd_signal);
78 signal(SIGKILL, klogd_signal);
79 signal(SIGTERM, klogd_signal);
80 signal(SIGHUP, SIG_IGN);
82 /* "Open the log. Currently a NOP." */
85 /* Set level of kernel console messaging.. */
86 if (console_log_level != -1)
87 klogctl(8, NULL, console_log_level);
89 syslog(LOG_NOTICE, "klogd started: %s", BB_BANNER);
92 /* Use kernel syscalls */
93 memset(log_buffer, '\0', KLOGD_LOGBUF_SIZE);
94 n = klogctl(2, log_buffer, KLOGD_LOGBUF_SIZE);
98 syslog(LOG_ERR, "klogd: Error from sys_sycall: %d - %m.\n",
103 /* klogctl buffer parsing modelled after code in dmesg.c */
104 start = &log_buffer[0];
106 for (i = 0; i < n; i++) {
107 if (lastc == '\0' && log_buffer[i] == '<') {
110 while (log_buffer[i] >= '0' && log_buffer[i] <= '9') {
111 priority = priority * 10 + (log_buffer[i] - '0');
114 if (log_buffer[i] == '>')
116 start = &log_buffer[i];
118 if (log_buffer[i] == '\n') {
119 log_buffer[i] = '\0'; /* zero terminate this message */
120 syslog(priority, "%s", start);
121 start = &log_buffer[i + 1];
124 lastc = log_buffer[i];
127 if (ENABLE_FEATURE_CLEAN_UP)
128 RELEASE_CONFIG_BUFFER(log_buffer);