| /* 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 console_log_level = console_log_level; /* for gcc */ |
| int priority = LOG_INFO; |
| int i, n, lastc; |
| char *start; |
| |
| /* do normal option parsing */ |
| n = getopt32(argc, argv, "c:n", &start); |
| |
| if (n & OPT_LEVEL) { |
| /* Valid levels are between 1 and 8 */ |
| console_log_level = xatoul_range(start, 1, 8); |
| } |
| |
| if (!(n & 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 (n & OPT_LEVEL) |
| klogctl(8, NULL, console_log_level); |
| |
| syslog(LOG_NOTICE, "klogd started: %s", BB_BANNER); |
| |
| while (1) { |
| /* 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'; |
| 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; |
| } |