[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini klogd implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>.
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| 6 | * Changes: Made this a standalone busybox module which uses standalone
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| 7 | * syslog() client interface.
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| 8 | *
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| 9 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 10 | *
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| 11 | * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
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| 12 | *
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| 13 | * "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@gena01.com>
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| 14 | *
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| 15 | * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
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| 16 | *
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| 17 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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| 18 | */
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| 19 |
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[1770] | 20 | #include "libbb.h"
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[821] | 21 | #include <sys/syslog.h>
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| 22 | #include <sys/klog.h>
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| 23 |
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| 24 | static void klogd_signal(int sig ATTRIBUTE_UNUSED)
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| 25 | {
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| 26 | klogctl(7, NULL, 0);
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| 27 | klogctl(0, 0, 0);
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[1770] | 28 | syslog(LOG_NOTICE, "Kernel log daemon exiting");
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[821] | 29 | exit(EXIT_SUCCESS);
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| 30 | }
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| 31 |
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| 32 | #define OPT_LEVEL 1
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| 33 | #define OPT_FOREGROUND 2
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| 34 |
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[1770] | 35 | #define KLOGD_LOGBUF_SIZE BUFSIZ
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| 36 | #define log_buffer bb_common_bufsiz1
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[821] | 37 |
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[1770] | 38 | int klogd_main(int argc, char **argv);
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[821] | 39 | int klogd_main(int argc, char **argv)
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| 40 | {
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[1770] | 41 | int i = i; /* silence gcc */
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[821] | 42 | char *start;
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| 43 |
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[1770] | 44 | /* do normal option parsing */
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| 45 | getopt32(argv, "c:n", &start);
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[821] | 46 |
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[1770] | 47 | if (option_mask32 & OPT_LEVEL) {
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| 48 | /* Valid levels are between 1 and 8 */
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| 49 | i = xatoul_range(start, 1, 8);
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| 50 | }
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[821] | 51 |
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[1770] | 52 | if (!(option_mask32 & OPT_FOREGROUND)) {
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| 53 | bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
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[821] | 54 | }
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| 55 |
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| 56 | openlog("kernel", 0, LOG_KERN);
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| 57 |
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| 58 | /* Set up sig handlers */
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| 59 | signal(SIGINT, klogd_signal);
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| 60 | signal(SIGKILL, klogd_signal);
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| 61 | signal(SIGTERM, klogd_signal);
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| 62 | signal(SIGHUP, SIG_IGN);
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| 63 |
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| 64 | /* "Open the log. Currently a NOP." */
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| 65 | klogctl(1, NULL, 0);
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| 66 |
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[1770] | 67 | /* Set level of kernel console messaging. */
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| 68 | if (option_mask32 & OPT_LEVEL)
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| 69 | klogctl(8, NULL, i);
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[821] | 70 |
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[1770] | 71 | syslog(LOG_NOTICE, "klogd started: %s", bb_banner);
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[821] | 72 |
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[1770] | 73 | /* Note: this code does not detect incomplete messages
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| 74 | * (messages not ending with '\n' or just when kernel
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| 75 | * generates too many messages for us to keep up)
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| 76 | * and will split them in two separate lines */
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[821] | 77 | while (1) {
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[1770] | 78 | int n;
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| 79 | int priority;
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| 80 |
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| 81 | n = klogctl(2, log_buffer, KLOGD_LOGBUF_SIZE - 1);
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[821] | 82 | if (n < 0) {
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| 83 | if (errno == EINTR)
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| 84 | continue;
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[1770] | 85 | syslog(LOG_ERR, "klogd: error from klogctl(2): %d - %m",
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| 86 | errno);
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| 87 | break;
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[821] | 88 | }
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[1770] | 89 | log_buffer[n] = '\n';
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| 90 | i = 0;
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| 91 | while (i < n) {
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| 92 | priority = LOG_INFO;
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| 93 | start = &log_buffer[i];
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| 94 | if (log_buffer[i] == '<') {
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[821] | 95 | i++;
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[1770] | 96 | // kernel never ganerates multi-digit prios
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| 97 | //priority = 0;
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| 98 | //while (log_buffer[i] >= '0' && log_buffer[i] <= '9') {
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| 99 | // priority = priority * 10 + (log_buffer[i] - '0');
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| 100 | // i++;
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| 101 | //}
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| 102 | if (isdigit(log_buffer[i])) {
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| 103 | priority = (log_buffer[i] - '0');
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[821] | 104 | i++;
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| 105 | }
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| 106 | if (log_buffer[i] == '>')
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| 107 | i++;
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| 108 | start = &log_buffer[i];
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| 109 | }
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[1770] | 110 | while (log_buffer[i] != '\n')
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| 111 | i++;
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| 112 | log_buffer[i] = '\0';
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| 113 | syslog(priority, "%s", start);
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| 114 | i++;
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[821] | 115 | }
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| 116 | }
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| 117 |
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[1770] | 118 | return EXIT_FAILURE;
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[821] | 119 | }
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