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Diffstat (limited to 'busybox/sysklogd/klogd.c')
| -rw-r--r-- | busybox/sysklogd/klogd.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/busybox/sysklogd/klogd.c b/busybox/sysklogd/klogd.c new file mode 100644 index 0000000..c908b59 --- /dev/null +++ b/busybox/sysklogd/klogd.c @@ -0,0 +1,165 @@ +/* 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 + * + * 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> +#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: " 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]; + } + } +} + +extern int klogd_main(int argc, char **argv) +{ + /* no options, no getopt */ + int opt; + int doFork = TRUE; + unsigned char console_log_level = -1; + + /* do normal option parsing */ + while ((opt = getopt(argc, argv, "c:n")) > 0) { + switch (opt) { + case 'c': + if ((optarg == NULL) || (optarg[1] != '\0')) { + bb_show_usage(); + } + /* Valid levels are between 1 and 8 */ + console_log_level = *optarg - '1'; + if (console_log_level > 7) { + bb_show_usage(); + } + console_log_level++; + + break; + case 'n': + doFork = FALSE; + break; + default: + bb_show_usage(); + } + } + + if (doFork) { +#if defined(__uClinux__) + vfork_daemon_rexec(0, 1, argc, argv, "-n"); +#else /* __uClinux__ */ + if (daemon(0, 1) < 0) + bb_perror_msg_and_die("daemon"); +#endif /* __uClinux__ */ + } + doKlogd(console_log_level); + + return EXIT_SUCCESS; +} + +/* +Local Variables +c-file-style: "linux" +c-basic-offset: 4 +tab-width: 4 +End: +*/ |