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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 4096
- 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;
- }
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