66 lines
1.1 KiB
C
66 lines
1.1 KiB
C
#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/klog.h>
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int main(int argc, char **argv) {
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unsigned int s_size = 0;
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unsigned int n_level = 0;
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int opt;
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while ((opt = getopt(argc, argv, "s:n:")) != -1) {
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switch (opt) {
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case 's':
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s_size = atoi(optarg);
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break;
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case 'n':
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n_level = atoi(optarg);
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break;
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default:
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printf("dmesg\n\t[-n LEVEL Set console logging level] [-s SIZE Buffer Size]\n");
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return 0;
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}
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}
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/* Setup */
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if (n_level)
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if (klogctl(8, NULL, (long)n_level) < 0) {
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fprintf(stderr, "dmesg: %s\n", strerror(errno));
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return 1;
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}
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if (!s_size)
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s_size = klogctl(10, NULL, 0);
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/* Get kernel log */
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char *buf = malloc(s_size + 1);
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if (buf == NULL) {
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fprintf(stderr, "dmesg: malloc failed\n");
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return 1;
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}
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int n = klogctl(3, buf, s_size);
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if (n <= 0) {
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free(buf);
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if (n == 0)
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return 0;
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fprintf(stderr, "dmesg: %s\n", strerror(errno));
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return 1;
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}
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/* Print */
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write(STDOUT_FILENO, buf, n);
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putchar('\n');
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free(buf);
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return 0;
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}
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