66 lines
1.2 KiB
C
66 lines
1.2 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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#define BUF_SIZE 8196
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int main(const int argc, const 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 i;
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for (i = 1; i < argc; i++) {
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if (argv[i][0] != '-')
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break;
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else if (!strncmp(argv[i], "-s=", 3))
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s_size = atoi(argv[i] + 3);
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else if (!strncmp(argv[i], "-n=", 3))
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n_level = atoi(argv[i] + 3);
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else if (!strcmp(argv[i], "--help")) {
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printf("dmesg [-n=L Set console logging level] [-s=S 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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