mirror of
https://git.busybox.net/busybox.git
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140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini klogd implementation for busybox
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*
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* Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>.
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* Changes: Made this a standalone busybox module which uses standalone
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* syslog() client interface.
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
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*
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* "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@gena01.com>
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*
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* Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h> /* for our signal() handlers */
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#include <string.h> /* strncpy() */
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#include <errno.h> /* errno and friends */
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#include <unistd.h>
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#include <ctype.h>
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#include <sys/syslog.h>
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#include <sys/klog.h>
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#include "busybox.h"
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static void klogd_signal(int sig)
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{
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klogctl(7, NULL, 0);
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klogctl(0, 0, 0);
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/* logMessage(0, "Kernel log daemon exiting."); */
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syslog(LOG_NOTICE, "Kernel log daemon exiting.");
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exit(EXIT_SUCCESS);
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}
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static void doKlogd(const int console_log_level) ATTRIBUTE_NORETURN;
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static void doKlogd(const int console_log_level)
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{
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int priority = LOG_INFO;
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char log_buffer[4096];
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int i, n, lastc;
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char *start;
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openlog("kernel", 0, LOG_KERN);
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/* Set up sig handlers */
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signal(SIGINT, klogd_signal);
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signal(SIGKILL, klogd_signal);
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signal(SIGTERM, klogd_signal);
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signal(SIGHUP, SIG_IGN);
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/* "Open the log. Currently a NOP." */
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klogctl(1, NULL, 0);
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/* Set level of kernel console messaging.. */
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if (console_log_level != -1)
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klogctl(8, NULL, console_log_level);
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syslog(LOG_NOTICE, "klogd started: %s", BB_BANNER);
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while (1) {
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/* Use kernel syscalls */
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memset(log_buffer, '\0', sizeof(log_buffer));
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n = klogctl(2, log_buffer, sizeof(log_buffer));
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if (n < 0) {
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if (errno == EINTR)
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continue;
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syslog(LOG_ERR, "klogd: Error return from sys_sycall: %d - %m.\n", errno);
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exit(EXIT_FAILURE);
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}
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/* klogctl buffer parsing modelled after code in dmesg.c */
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start = &log_buffer[0];
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lastc = '\0';
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for (i = 0; i < n; i++) {
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if (lastc == '\0' && log_buffer[i] == '<') {
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priority = 0;
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i++;
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while (isdigit(log_buffer[i])) {
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priority = priority * 10 + (log_buffer[i] - '0');
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i++;
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}
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if (log_buffer[i] == '>')
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i++;
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start = &log_buffer[i];
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}
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if (log_buffer[i] == '\n') {
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log_buffer[i] = '\0'; /* zero terminate this message */
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syslog(priority, "%s", start);
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start = &log_buffer[i + 1];
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priority = LOG_INFO;
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}
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lastc = log_buffer[i];
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}
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}
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}
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#define OPT_LEVEL 1
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#define OPT_FOREGROUND 2
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int klogd_main(int argc, char **argv)
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{
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unsigned long opt;
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char *c_arg;
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int console_log_level = -1;
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/* do normal option parsing */
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opt = bb_getopt_ulflags (argc, argv, "c:n", &c_arg);
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if (opt & OPT_LEVEL) {
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/* Valid levels are between 1 and 8 */
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console_log_level = bb_xgetlarg(c_arg, 10, 1, 8);
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}
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if (!(opt & OPT_FOREGROUND)) {
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#if defined(__uClinux__)
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vfork_daemon_rexec(0, 1, argc, argv, "-n");
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#else /* __uClinux__ */
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if (daemon(0, 1) < 0)
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bb_perror_msg_and_die("daemon");
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#endif /* __uClinux__ */
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}
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doKlogd(console_log_level);
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return EXIT_SUCCESS;
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}
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/*
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Local Variables
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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