diff options
Diffstat (limited to 'sysklogd/klogd.c')
| -rw-r--r-- | sysklogd/klogd.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/sysklogd/klogd.c b/sysklogd/klogd.c new file mode 100644 index 000000000..f735d9fc1 --- /dev/null +++ b/sysklogd/klogd.c @@ -0,0 +1,123 @@ +/* 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); + /* logMessage(0, "Kernel log daemon exiting."); */ + 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 console_log_level = -1; + int priority = LOG_INFO; + int i, n, lastc; + char *start; + + { + unsigned opt; + + /* do normal option parsing */ + opt = getopt32(argc, argv, "c:n", &start); + + if (opt & OPT_LEVEL) { + /* Valid levels are between 1 and 8 */ + console_log_level = xatoul_range(start, 1, 8); + } + + if (!(opt & 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 (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', KLOGD_LOGBUF_SIZE); + n = klogctl(2, log_buffer, KLOGD_LOGBUF_SIZE); + if (n < 0) { + if (errno == EINTR) + continue; + syslog(LOG_ERR, "klogd: Error 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 (log_buffer[i] >= '0' && log_buffer[i] <= '9') { + 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]; + } + } + if (ENABLE_FEATURE_CLEAN_UP) + RELEASE_CONFIG_BUFFER(log_buffer); + + return EXIT_SUCCESS; +} |