43 lines
856 B
C
43 lines
856 B
C
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include <sys/klog.h>
|
|
#include <string.h>
|
|
|
|
#define KLOG_BUF_SHIFT 17 /* CONFIG_LOG_BUF_SHIFT from our kernel */
|
|
#define KLOG_BUF_LEN (1 << KLOG_BUF_SHIFT)
|
|
|
|
int dmesg_main(int argc, char **argv)
|
|
{
|
|
char buffer[KLOG_BUF_LEN + 1];
|
|
char *p = buffer;
|
|
ssize_t ret;
|
|
int n, op;
|
|
|
|
if((argc == 2) && (!strcmp(argv[1],"-c"))) {
|
|
op = KLOG_READ_CLEAR;
|
|
} else {
|
|
op = KLOG_READ_ALL;
|
|
}
|
|
|
|
n = klogctl(op, buffer, KLOG_BUF_LEN);
|
|
if (n < 0) {
|
|
perror("klogctl");
|
|
return EXIT_FAILURE;
|
|
}
|
|
buffer[n] = '\0';
|
|
|
|
while((ret = write(STDOUT_FILENO, p, n))) {
|
|
if (ret == -1) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
perror("write");
|
|
return EXIT_FAILURE;
|
|
}
|
|
p += ret;
|
|
n -= ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|