/* 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 <stdio.h> #include <stdlib.h> #include <signal.h> /* for our signal() handlers */ #include <string.h> /* strncpy() */ #include <errno.h> /* errno and friends */ #include <unistd.h> #include <ctype.h> #include <sys/syslog.h> #include <sys/klog.h> #include "busybox.h" static void klogd_signal(int sig) { klogctl(7, NULL, 0); klogctl(0, 0, 0); /* logMessage(0, "Kernel log daemon exiting."); */ syslog(LOG_NOTICE, "Kernel log daemon exiting."); exit(EXIT_SUCCESS); } static void doKlogd(const int console_log_level) ATTRIBUTE_NORETURN; static void doKlogd(const int console_log_level) { int priority = LOG_INFO; char log_buffer[4096]; int i, n, lastc; char *start; 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 (console_log_level != -1) klogctl(8, NULL, console_log_level); syslog(LOG_NOTICE, "klogd started: %s", BB_BANNER); while (1) { /* Use kernel syscalls */ memset(log_buffer, '\0', sizeof(log_buffer)); n = klogctl(2, log_buffer, sizeof(log_buffer)); if (n < 0) { if (errno == EINTR) continue; syslog(LOG_ERR, "klogd: Error return from sys_sycall: %d - %m.\n", errno); exit(EXIT_FAILURE); } /* 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] == '<') { priority = 0; i++; while (isdigit(log_buffer[i])) { priority = priority * 10 + (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]; } } } #define OPT_LEVEL 1 #define OPT_FOREGROUND 2 int klogd_main(int argc, char **argv) { unsigned long opt; char *c_arg; int console_log_level = -1; /* do normal option parsing */ opt = bb_getopt_ulflags (argc, argv, "c:n", &c_arg); if (opt & OPT_LEVEL) { /* Valid levels are between 1 and 8 */ console_log_level = bb_xgetlarg(c_arg, 10, 1, 8); } if (!(opt & OPT_FOREGROUND)) { #if defined(__uClinux__) vfork_daemon_rexec(0, 1, argc, argv, "-n"); #else /* __uClinux__ */ bb_xdaemon(0, 1); #endif /* __uClinux__ */ } doKlogd(console_log_level); return EXIT_SUCCESS; } /* Local Variables c-file-style: "linux" c-basic-offset: 4 tab-width: 4 End: */