1 files changed, 165 insertions, 0 deletions

diff --git a/busybox/sysklogd/klogd.c b/busybox/sysklogd/klogd.c
new file mode 100644
index 000000000..c908b593c
--- /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:
+*/