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- #include <stdlib.h>
- #include <unistd.h>
- #include <stdio.h>
- #include <errno.h>
- #include <sys/klog.h>
- #include <string.h>
- #define FALLBACK_KLOG_BUF_SHIFT 17 /* CONFIG_LOG_BUF_SHIFT from our kernel */
- #define FALLBACK_KLOG_BUF_LEN (1 << FALLBACK_KLOG_BUF_SHIFT)
- #ifndef KLOG_SIZE_BUFFER
- #define KLOG_READ_ALL 3
- #define KLOG_READ_CLEAR 4
- #define KLOG_SIZE_BUFFER 10
- #endif
- int main(int argc, char **argv)
- {
- char *buffer;
- char *p;
- ssize_t ret;
- int n, op, klog_buf_len;
- klog_buf_len = klogctl(KLOG_SIZE_BUFFER, 0, 0);
- if (klog_buf_len <= 0) {
- klog_buf_len = FALLBACK_KLOG_BUF_LEN;
- }
- buffer = (char *)malloc(klog_buf_len + 1);
- if (!buffer) {
- perror("malloc");
- return EXIT_FAILURE;
- }
- p = buffer;
- 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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