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#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;
}
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