source: MondoRescue/branches/stable/mindi-busybox/sysklogd/klogd.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 3.1 KB
Line 
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 <stdio.h>
22#include <stdlib.h>
23#include <signal.h>     /* for our signal() handlers */
24#include <string.h>     /* strncpy() */
25#include <errno.h>      /* errno and friends */
26#include <unistd.h>
27#include <ctype.h>
28#include <sys/syslog.h>
29#include <sys/klog.h>
30
31static void klogd_signal(int sig ATTRIBUTE_UNUSED)
32{
33    klogctl(7, NULL, 0);
34    klogctl(0, 0, 0);
35    /* logMessage(0, "Kernel log daemon exiting."); */
36    syslog(LOG_NOTICE, "Kernel log daemon exiting.");
37    exit(EXIT_SUCCESS);
38}
39
40#define OPT_LEVEL        1
41#define OPT_FOREGROUND   2
42
43#define KLOGD_LOGBUF_SIZE 4096
44
45int klogd_main(int argc, char **argv)
46{
47    RESERVE_CONFIG_BUFFER(log_buffer, KLOGD_LOGBUF_SIZE);
48    int console_log_level = -1;
49    int priority = LOG_INFO;
50    int i, n, lastc;
51    char *start;
52
53
54    {
55        unsigned long opt;
56
57        /* do normal option parsing */
58        opt = bb_getopt_ulflags(argc, argv, "c:n", &start);
59
60        if (opt & OPT_LEVEL) {
61            /* Valid levels are between 1 and 8 */
62            console_log_level = bb_xgetlarg(start, 10, 1, 8);
63        }
64
65        if (!(opt & OPT_FOREGROUND)) {
66#ifdef BB_NOMMU
67            vfork_daemon_rexec(0, 1, argc, argv, "-n");
68#else
69            bb_xdaemon(0, 1);
70#endif
71        }
72    }
73
74    openlog("kernel", 0, LOG_KERN);
75
76    /* Set up sig handlers */
77    signal(SIGINT, klogd_signal);
78    signal(SIGKILL, klogd_signal);
79    signal(SIGTERM, klogd_signal);
80    signal(SIGHUP, SIG_IGN);
81
82    /* "Open the log. Currently a NOP." */
83    klogctl(1, NULL, 0);
84
85    /* Set level of kernel console messaging.. */
86    if (console_log_level != -1)
87        klogctl(8, NULL, console_log_level);
88
89    syslog(LOG_NOTICE, "klogd started: %s", BB_BANNER);
90
91    while (1) {
92        /* Use kernel syscalls */
93        memset(log_buffer, '\0', KLOGD_LOGBUF_SIZE);
94        n = klogctl(2, log_buffer, KLOGD_LOGBUF_SIZE);
95        if (n < 0) {
96            if (errno == EINTR)
97                continue;
98            syslog(LOG_ERR, "klogd: Error from sys_sycall: %d - %m.\n",
99                   errno);
100            exit(EXIT_FAILURE);
101        }
102
103        /* klogctl buffer parsing modelled after code in dmesg.c */
104        start = &log_buffer[0];
105        lastc = '\0';
106        for (i = 0; i < n; i++) {
107            if (lastc == '\0' && log_buffer[i] == '<') {
108                priority = 0;
109                i++;
110                while (log_buffer[i] >= '0' && log_buffer[i] <= '9') {
111                    priority = priority * 10 + (log_buffer[i] - '0');
112                    i++;
113                }
114                if (log_buffer[i] == '>')
115                    i++;
116                start = &log_buffer[i];
117            }
118            if (log_buffer[i] == '\n') {
119                log_buffer[i] = '\0';   /* zero terminate this message */
120                syslog(priority, "%s", start);
121                start = &log_buffer[i + 1];
122                priority = LOG_INFO;
123            }
124            lastc = log_buffer[i];
125        }
126    }
127    if (ENABLE_FEATURE_CLEAN_UP)
128        RELEASE_CONFIG_BUFFER(log_buffer);
129
130    return EXIT_SUCCESS;
131}
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