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    Contents of /trunk/mkinitrd-magellan/busybox/sysklogd/klogd.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 3061 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * Mini klogd implementation for busybox
    4 *
    5 * Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>.
    6 * Changes: Made this a standalone busybox module which uses standalone
    7 * syslog() client interface.
    8 *
    9 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
    10 *
    11 * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
    12 *
    13 * "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@gena01.com>
    14 *
    15 * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
    16 *
    17 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
    18 */
    19
    20 #include "busybox.h"
    21 #include <sys/syslog.h>
    22 #include <sys/klog.h>
    23
    24 static void klogd_signal(int sig ATTRIBUTE_UNUSED)
    25 {
    26 klogctl(7, NULL, 0);
    27 klogctl(0, 0, 0);
    28 syslog(LOG_NOTICE, "Kernel log daemon exiting");
    29 exit(EXIT_SUCCESS);
    30 }
    31
    32 #define OPT_LEVEL 1
    33 #define OPT_FOREGROUND 2
    34
    35 #define KLOGD_LOGBUF_SIZE 4096
    36
    37 int klogd_main(int argc, char **argv)
    38 {
    39 RESERVE_CONFIG_BUFFER(log_buffer, KLOGD_LOGBUF_SIZE);
    40 int i = i; /* silence gcc */
    41 char *start;
    42
    43 /* do normal option parsing */
    44 getopt32(argc, argv, "c:n", &start);
    45
    46 if (option_mask32 & OPT_LEVEL) {
    47 /* Valid levels are between 1 and 8 */
    48 i = xatoul_range(start, 1, 8);
    49 }
    50
    51 if (!(option_mask32 & OPT_FOREGROUND)) {
    52 #ifdef BB_NOMMU
    53 vfork_daemon_rexec(0, 1, argc, argv, "-n");
    54 #else
    55 xdaemon(0, 1);
    56 #endif
    57 }
    58
    59 openlog("kernel", 0, LOG_KERN);
    60
    61 /* Set up sig handlers */
    62 signal(SIGINT, klogd_signal);
    63 signal(SIGKILL, klogd_signal);
    64 signal(SIGTERM, klogd_signal);
    65 signal(SIGHUP, SIG_IGN);
    66
    67 /* "Open the log. Currently a NOP." */
    68 klogctl(1, NULL, 0);
    69
    70 /* Set level of kernel console messaging.. */
    71 if (option_mask32 & OPT_LEVEL)
    72 klogctl(8, NULL, i);
    73
    74 syslog(LOG_NOTICE, "klogd started: %s", BB_BANNER);
    75
    76 while (1) {
    77 int n;
    78 int priority;
    79 char lastc;
    80
    81 /* Use kernel syscalls */
    82 memset(log_buffer, '\0', KLOGD_LOGBUF_SIZE);
    83 /* It will be null-terminted */
    84 n = klogctl(2, log_buffer, KLOGD_LOGBUF_SIZE - 1);
    85 if (n < 0) {
    86 if (errno == EINTR)
    87 continue;
    88 syslog(LOG_ERR, "klogd: error from klogctl(2): %d - %m",
    89 errno);
    90 break;
    91 }
    92
    93 /* klogctl buffer parsing modelled after code in dmesg.c */
    94 start = &log_buffer[0];
    95 lastc = '\0';
    96 priority = LOG_INFO;
    97 for (i = 0; i < n; i++) {
    98 if (lastc == '\0' && log_buffer[i] == '<') {
    99 i++;
    100 // kernel never ganerates multi-digit prios
    101 //priority = 0;
    102 //while (log_buffer[i] >= '0' && log_buffer[i] <= '9') {
    103 // priority = priority * 10 + (log_buffer[i] - '0');
    104 // i++;
    105 //}
    106 if (isdigit(log_buffer[i])) {
    107 priority = (log_buffer[i] - '0');
    108 i++;
    109 }
    110 if (log_buffer[i] == '>')
    111 i++;
    112 start = &log_buffer[i];
    113 }
    114 if (log_buffer[i] == '\n') {
    115 log_buffer[i] = '\0'; /* zero terminate this message */
    116 syslog(priority, "%s", start);
    117 start = &log_buffer[i + 1];
    118 priority = LOG_INFO;
    119 }
    120 lastc = log_buffer[i];
    121 }
    122 }
    123 if (ENABLE_FEATURE_CLEAN_UP)
    124 RELEASE_CONFIG_BUFFER(log_buffer);
    125
    126 return EXIT_FAILURE;
    127 }