diff options
Diffstat (limited to 'klogd.c')
| -rw-r--r-- | klogd.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/klogd.c b/klogd.c new file mode 100644 index 000000000..f44383637 --- /dev/null +++ b/klogd.c @@ -0,0 +1,171 @@ +/* vi: set sw=4 ts=4: */ +/* + * Mini klogd implementation for busybox + * + * Copyright (C) 2001 by Gennady Feldman <gfeldman@cachier.com>. + * Changes: Made this a standalone busybox module which uses standalone + * syslog() client interface. + * + * Copyright (C) 1999,2000,2001 by Lineo, inc. + * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org> + * + * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org> + * + * "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@mail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#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> + +#if ! defined __GLIBC__ && ! defined __UCLIBC__ +#include <sys/syscall.h> +#include <linux/unistd.h> +typedef unsigned int socklen_t; + +#ifndef __alpha__ +# define __NR_klogctl __NR_syslog +static inline _syscall3(int, klogctl, int, type, char *, b, int, len); +#else /* __alpha__ */ +#define klogctl syslog +#endif + +#else +# include <sys/klog.h> +#endif +#include "busybox.h" + +static void klogd_signal(int sig) +{ + klogctl(7, NULL, 0); + klogctl(0, 0, 0); + //logMessage(0, "Kernel log daemon exiting."); + syslog_msg(LOG_DAEMON, 0, "Kernel log daemon exiting."); + exit(TRUE); +} + +static void doKlogd (void) __attribute__ ((noreturn)); +static void doKlogd (void) +{ + int priority = LOG_INFO; + char log_buffer[4096]; + int i, n, lastc; + char *start; + + /* 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); + + syslog_msg(LOG_DAEMON, 0, "klogd started: BusyBox v" BB_VER " (" BB_BT ")"); + + while (1) { + /* Use kernel syscalls */ + memset(log_buffer, '\0', sizeof(log_buffer)); + n = klogctl(2, log_buffer, sizeof(log_buffer)); + if (n < 0) { + char message[80]; + + if (errno == EINTR) + continue; + snprintf(message, 79, "klogd: Error return from sys_sycall: %d - %s.\n", + errno, strerror(errno)); + syslog_msg(LOG_DAEMON, LOG_SYSLOG | LOG_ERR, message); + exit(1); + } + + /* 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_msg(LOG_DAEMON, LOG_KERN | priority, start); + start = &log_buffer[i+1]; + priority = LOG_INFO; + } + lastc = log_buffer[i]; + } + } +} + +static void daemon_init (char **argv, char *dz, void fn (void)) +{ + setsid(); /* start a new session? */ + strncpy(argv[0], dz, strlen(argv[0])); + fn(); + exit(0); +} + +extern int klogd_main(int argc, char **argv) +{ + /* no options, no getopt */ + int opt, pid; + int doFork = TRUE; + + /* do normal option parsing */ + while ((opt = getopt(argc, argv, "n")) > 0) { + switch (opt) { + case 'n': + doFork = FALSE; + break; + default: + show_usage(); + } + } + + if (doFork == TRUE) { + pid = fork(); + if (pid < 0) + exit(pid); + else if (pid == 0) { + daemon_init (argv, "klogd", doKlogd); + } + } else { + doKlogd(); + } + + return EXIT_SUCCESS; +} + +/* +Local Variables +c-file-style: "linux" +c-basic-offset: 4 +tab-width: 4 +End: +*/ |