/* 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; }