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klogd.c
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klogd.c
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#include <stdlib.h>
#include <syslog.h>
#include <sys/klog.h>
#include "common.h"
#include "daemon.h"
/* the maximum length of a kernel log message */
#define MAX_MESSAGE_LENGTH (MAX_LENGTH)
/* the usage message */
#define USAGE "Usage: klogd\n"
int main(int argc, char *argv[]) {
/* a log message */
char message[1 + MAX_MESSAGE_LENGTH] = {'\0'};
/* the message size */
int size = 0;
/* the message priority */
int priority = 0;
/* the message offset */
unsigned int offset = 0;
/* the exit code */
int exit_code = EXIT_FAILURE;
/* make sure the number of command-line arguments is valid */
if (1 != argc) {
PRINT(USAGE);
goto end;
}
/* open the kernel log */
if (-1 == klogctl(1, NULL, 0)) {
goto end;
}
/* disable output of kernel messages to the console */
if (-1 == klogctl(6, NULL, 0)) {
goto end;
}
/* open the system log */
openlog("kernel", LOG_NDELAY, LOG_KERN);
/* daemonize */
if (false == daemon_daemonize(DAEMON_WORKING_DIRECTORY, NULL)) {
goto close_log;
}
do {
/* read a log message */
size = klogctl(2, message, sizeof(message));
switch (size) {
case (-1):
goto close_log;
case 0:
continue;
}
/* parse the message priority */
priority = LOG_INFO;
if (3 >= size) {
offset = 0;
} else {
if (('<' == message[0]) && ('>' == message[2])) {
priority = message[1] - '0';
offset = 3;
}
}
/* terminate the log message */
message[size] = '\0';
/* write the message to the system log */
syslog(priority, message + offset);
} while (1);
close_log:
/* close the system log */
closelog();
/* re-enable output of kernel log messages */
(void) klogctl(7, NULL, 0);
/* close the kernel log */
(void) klogctl(0, NULL, 0);
end:
return exit_code;
}