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 @@ | |||
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 | /* logMessage(0, "Kernel log daemon exiting."); */ | ||
29 | syslog(LOG_NOTICE, "Kernel log daemon exiting."); | ||
30 | exit(EXIT_SUCCESS); | ||
31 | } | ||
32 | |||
33 | #define OPT_LEVEL 1 | ||
34 | #define OPT_FOREGROUND 2 | ||
35 | |||
36 | #define KLOGD_LOGBUF_SIZE 4096 | ||
37 | |||
38 | int klogd_main(int argc, char **argv) | ||
39 | { | ||
40 | RESERVE_CONFIG_BUFFER(log_buffer, KLOGD_LOGBUF_SIZE); | ||
41 | int console_log_level = -1; | ||
42 | int priority = LOG_INFO; | ||
43 | int i, n, lastc; | ||
44 | char *start; | ||
45 | |||
46 | { | ||
47 | unsigned opt; | ||
48 | |||
49 | /* do normal option parsing */ | ||
50 | opt = getopt32(argc, argv, "c:n", &start); | ||
51 | |||
52 | if (opt & OPT_LEVEL) { | ||
53 | /* Valid levels are between 1 and 8 */ | ||
54 | console_log_level = xatoul_range(start, 1, 8); | ||
55 | } | ||
56 | |||
57 | if (!(opt & OPT_FOREGROUND)) { | ||
58 | #ifdef BB_NOMMU | ||
59 | vfork_daemon_rexec(0, 1, argc, argv, "-n"); | ||
60 | #else | ||
61 | xdaemon(0, 1); | ||
62 | #endif | ||
63 | } | ||
64 | } | ||
65 | |||
66 | openlog("kernel", 0, LOG_KERN); | ||
67 | |||
68 | /* Set up sig handlers */ | ||
69 | signal(SIGINT, klogd_signal); | ||
70 | signal(SIGKILL, klogd_signal); | ||
71 | signal(SIGTERM, klogd_signal); | ||
72 | signal(SIGHUP, SIG_IGN); | ||
73 | |||
74 | /* "Open the log. Currently a NOP." */ | ||
75 | klogctl(1, NULL, 0); | ||
76 | |||
77 | /* Set level of kernel console messaging.. */ | ||
78 | if (console_log_level != -1) | ||
79 | klogctl(8, NULL, console_log_level); | ||
80 | |||
81 | syslog(LOG_NOTICE, "klogd started: %s", BB_BANNER); | ||
82 | |||
83 | while (1) { | ||
84 | /* Use kernel syscalls */ | ||
85 | memset(log_buffer, '\0', KLOGD_LOGBUF_SIZE); | ||
86 | n = klogctl(2, log_buffer, KLOGD_LOGBUF_SIZE); | ||
87 | if (n < 0) { | ||
88 | if (errno == EINTR) | ||
89 | continue; | ||
90 | syslog(LOG_ERR, "klogd: Error from sys_sycall: %d - %m.\n", | ||
91 | errno); | ||
92 | exit(EXIT_FAILURE); | ||
93 | } | ||
94 | |||
95 | /* klogctl buffer parsing modelled after code in dmesg.c */ | ||
96 | start = &log_buffer[0]; | ||
97 | lastc = '\0'; | ||
98 | for (i = 0; i < n; i++) { | ||
99 | if (lastc == '\0' && log_buffer[i] == '<') { | ||
100 | priority = 0; | ||
101 | i++; | ||
102 | while (log_buffer[i] >= '0' && log_buffer[i] <= '9') { | ||
103 | priority = priority * 10 + (log_buffer[i] - '0'); | ||
104 | i++; | ||
105 | } | ||
106 | if (log_buffer[i] == '>') | ||
107 | i++; | ||
108 | start = &log_buffer[i]; | ||
109 | } | ||
110 | if (log_buffer[i] == '\n') { | ||
111 | log_buffer[i] = '\0'; /* zero terminate this message */ | ||
112 | syslog(priority, "%s", start); | ||
113 | start = &log_buffer[i + 1]; | ||
114 | priority = LOG_INFO; | ||
115 | } | ||
116 | lastc = log_buffer[i]; | ||
117 | } | ||
118 | } | ||
119 | if (ENABLE_FEATURE_CLEAN_UP) | ||
120 | RELEASE_CONFIG_BUFFER(log_buffer); | ||
121 | |||
122 | return EXIT_SUCCESS; | ||
123 | } | ||