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

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 3276 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    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 "libbb.h"
    21 #include <syslog.h>
    22 #include <sys/klog.h>
    23
    24 static void klogd_signal(int sig)
    25 {
    26 /* FYI: cmd 7 is equivalent to setting console_loglevel to 7
    27 * via klogctl(8, NULL, 7). */
    28 klogctl(7, NULL, 0); /* "7 -- Enable printk's to console" */
    29 klogctl(0, NULL, 0); /* "0 -- Close the log. Currently a NOP" */
    30 syslog(LOG_NOTICE, "klogd: exiting");
    31 kill_myself_with_sig(sig);
    32 }
    33
    34 #define log_buffer bb_common_bufsiz1
    35 enum {
    36 KLOGD_LOGBUF_SIZE = sizeof(log_buffer),
    37 OPT_LEVEL = (1 << 0),
    38 OPT_FOREGROUND = (1 << 1),
    39 };
    40
    41 int klogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    42 int klogd_main(int argc UNUSED_PARAM, char **argv)
    43 {
    44 int i = 0;
    45 char *opt_c;
    46 int opt;
    47 int used = 0;
    48
    49 opt = getopt32(argv, "c:n", &opt_c);
    50 if (opt & OPT_LEVEL) {
    51 /* Valid levels are between 1 and 8 */
    52 i = xatou_range(opt_c, 1, 8);
    53 }
    54 if (!(opt & OPT_FOREGROUND)) {
    55 bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
    56 }
    57
    58 openlog("kernel", 0, LOG_KERN);
    59
    60 bb_signals(BB_FATAL_SIGS, klogd_signal);
    61 signal(SIGHUP, SIG_IGN);
    62
    63 /* "Open the log. Currently a NOP" */
    64 klogctl(1, NULL, 0);
    65
    66 /* "printk() prints a message on the console only if it has a loglevel
    67 * less than console_loglevel". Here we set console_loglevel = i. */
    68 if (i)
    69 klogctl(8, NULL, i);
    70
    71 syslog(LOG_NOTICE, "klogd started: %s", bb_banner);
    72
    73 while (1) {
    74 int n;
    75 int priority;
    76 char *start;
    77
    78 /* "2 -- Read from the log." */
    79 start = log_buffer + used;
    80 n = klogctl(2, start, KLOGD_LOGBUF_SIZE-1 - used);
    81 if (n < 0) {
    82 if (errno == EINTR)
    83 continue;
    84 syslog(LOG_ERR, "klogd: error %d in klogctl(2): %m",
    85 errno);
    86 break;
    87 }
    88 start[n] = '\0';
    89
    90 /* klogctl buffer parsing modelled after code in dmesg.c */
    91 /* Process each newline-terminated line in the buffer */
    92 start = log_buffer;
    93 while (1) {
    94 char *newline = strchrnul(start, '\n');
    95
    96 if (*newline == '\0') {
    97 /* This line is incomplete... */
    98 if (start != log_buffer) {
    99 /* move it to the front of the buffer */
    100 overlapping_strcpy(log_buffer, start);
    101 used = newline - start;
    102 /* don't log it yet */
    103 break;
    104 }
    105 /* ...but if buffer is full, log it anyway */
    106 used = 0;
    107 newline = NULL;
    108 } else {
    109 *newline++ = '\0';
    110 }
    111
    112 /* Extract the priority */
    113 priority = LOG_INFO;
    114 if (*start == '<') {
    115 start++;
    116 if (*start) {
    117 /* kernel never generates multi-digit prios */
    118 priority = (*start - '0');
    119 start++;
    120 }
    121 if (*start == '>')
    122 start++;
    123 }
    124 /* Log (only non-empty lines) */
    125 if (*start)
    126 syslog(priority, "%s", start);
    127
    128 if (!newline)
    129 break;
    130 start = newline;
    131 }
    132 }
    133
    134 return EXIT_FAILURE;
    135 }