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