blob: 52a815d569bb9c9a006b77b815e58714b38805a3 [file] [log] [blame]
Mark Whitley6317c4b2001-03-12 22:51:50 +00001/* vi: set sw=4 ts=4: */
2/*
3 * Mini klogd implementation for busybox
4 *
5 * Copyright (C) 2001 by Gennady Feldman <gfeldman@cachier.com>.
6 * Changes: Made this a standalone busybox module which uses standalone
7 * syslog() client interface.
8 *
Eric Andersenbdfd0d72001-10-24 05:00:29 +00009 * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
10 * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
Mark Whitley6317c4b2001-03-12 22:51:50 +000011 *
12 * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
13 *
14 * "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@mail.com>
15 *
Mark Whitley6bff9cc2001-03-12 23:41:34 +000016 * Maintainer: Gennady Feldman <gena01@cachier.com> as of Mar 12, 2001
17 *
Mark Whitley6317c4b2001-03-12 22:51:50 +000018 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2 of the License, or
21 * (at your option) any later version.
22 *
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
26 * General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 *
32 */
33
34#include <stdio.h>
35#include <stdlib.h>
36#include <signal.h> /* for our signal() handlers */
37#include <string.h> /* strncpy() */
38#include <errno.h> /* errno and friends */
39#include <unistd.h>
40#include <ctype.h>
41#include <sys/syslog.h>
42
Eric Andersene76c3b02001-04-05 03:14:39 +000043#if __GNU_LIBRARY__ < 5
44# ifdef __alpha__
45# define klogctl syslog
46# endif
Mark Whitley6317c4b2001-03-12 22:51:50 +000047#else
48# include <sys/klog.h>
49#endif
Eric Andersene76c3b02001-04-05 03:14:39 +000050
Mark Whitley6317c4b2001-03-12 22:51:50 +000051#include "busybox.h"
52
53static void klogd_signal(int sig)
54{
55 klogctl(7, NULL, 0);
56 klogctl(0, 0, 0);
57 //logMessage(0, "Kernel log daemon exiting.");
58 syslog_msg(LOG_DAEMON, 0, "Kernel log daemon exiting.");
59 exit(TRUE);
60}
61
62static void doKlogd (void) __attribute__ ((noreturn));
63static void doKlogd (void)
64{
65 int priority = LOG_INFO;
66 char log_buffer[4096];
67 int i, n, lastc;
68 char *start;
69
70 /* Set up sig handlers */
71 signal(SIGINT, klogd_signal);
72 signal(SIGKILL, klogd_signal);
73 signal(SIGTERM, klogd_signal);
74 signal(SIGHUP, SIG_IGN);
75
76 /* "Open the log. Currently a NOP." */
77 klogctl(1, NULL, 0);
78
Matt Kraai6ba1a802001-04-12 20:11:55 +000079 syslog_msg(LOG_DAEMON, 0, "klogd started: " BB_BANNER);
Mark Whitley6317c4b2001-03-12 22:51:50 +000080
81 while (1) {
82 /* Use kernel syscalls */
83 memset(log_buffer, '\0', sizeof(log_buffer));
84 n = klogctl(2, log_buffer, sizeof(log_buffer));
85 if (n < 0) {
86 char message[80];
87
88 if (errno == EINTR)
89 continue;
90 snprintf(message, 79, "klogd: Error return from sys_sycall: %d - %s.\n",
91 errno, strerror(errno));
92 syslog_msg(LOG_DAEMON, LOG_SYSLOG | LOG_ERR, message);
93 exit(1);
94 }
95
96 /* klogctl buffer parsing modelled after code in dmesg.c */
97 start=&log_buffer[0];
98 lastc='\0';
99 for (i=0; i<n; i++) {
100 if (lastc == '\0' && log_buffer[i] == '<') {
101 priority = 0;
102 i++;
103 while (isdigit(log_buffer[i])) {
104 priority = priority*10+(log_buffer[i]-'0');
105 i++;
106 }
107 if (log_buffer[i] == '>') i++;
108 start = &log_buffer[i];
109 }
110 if (log_buffer[i] == '\n') {
111 log_buffer[i] = '\0'; /* zero terminate this message */
112 syslog_msg(LOG_DAEMON, LOG_KERN | priority, start);
113 start = &log_buffer[i+1];
114 priority = LOG_INFO;
115 }
116 lastc = log_buffer[i];
117 }
118 }
119}
120
Mark Whitley6317c4b2001-03-12 22:51:50 +0000121extern int klogd_main(int argc, char **argv)
122{
123 /* no options, no getopt */
Eric Andersene5c24df2001-03-29 21:58:33 +0000124 int opt;
Mark Whitley6317c4b2001-03-12 22:51:50 +0000125 int doFork = TRUE;
126
127 /* do normal option parsing */
128 while ((opt = getopt(argc, argv, "n")) > 0) {
129 switch (opt) {
130 case 'n':
131 doFork = FALSE;
132 break;
133 default:
134 show_usage();
135 }
136 }
137
138 if (doFork == TRUE) {
Eric Andersen72f9a422001-10-28 05:12:20 +0000139#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
Eric Andersene5c24df2001-03-29 21:58:33 +0000140 if (daemon(0, 1) < 0)
141 perror_msg_and_die("daemon");
Eric Andersen72f9a422001-10-28 05:12:20 +0000142#else
143 error_msg_and_die("daemon not supported");
144#endif
Mark Whitley6317c4b2001-03-12 22:51:50 +0000145 }
Eric Andersene5c24df2001-03-29 21:58:33 +0000146 doKlogd();
Mark Whitley6317c4b2001-03-12 22:51:50 +0000147
148 return EXIT_SUCCESS;
149}
150
151/*
152Local Variables
153c-file-style: "linux"
154c-basic-offset: 4
155tab-width: 4
156End:
157*/