busybox/util-linux/dmesg.c

/* vi: set sw=4 ts=4: */
/*
 *
 * dmesg - display/control kernel ring buffer.
 *
 * Copyright 2006 Rob Landley <rob@landley.net>
 * Copyright 2006 Bernhard Reutner-Fischer <rep.nop@aon.at>
 *
 * Licensed under GPLv2, see file LICENSE in this tarball for details.
 */
#include <sys/klog.h>
#include "libbb.h"

int dmesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int dmesg_main(int argc UNUSED_PARAM, char **argv)
{
	int len, level;
	char *buf;
	unsigned opts;
	enum {
		OPT_c = 1 << 0,
		OPT_s = 1 << 1,
		OPT_n = 1 << 2
	};

	opt_complementary = "s+:n+"; /* numeric */
	opts = getopt32(argv, "cs:n:", &len, &level);
	if (opts & OPT_n) {
		if (klogctl(8, NULL, (long) level))
			bb_perror_msg_and_die("klogctl");
		return EXIT_SUCCESS;
	}

	if (!(opts & OPT_s))
		len = klogctl(10, NULL, 0); /* read ring buffer size */
	if (len < 16*1024)
		len = 16*1024;
	if (len > 16*1024*1024)
		len = 16*1024*1024;

	buf = xmalloc(len);
	len = klogctl(3 + (opts & OPT_c), buf, len); /* read ring buffer */
	if (len < 0)
		bb_perror_msg_and_die("klogctl");
	if (len == 0)
		return EXIT_SUCCESS;

	/* Skip <#> at the start of lines, and make sure we end with a newline */

	if (ENABLE_FEATURE_DMESG_PRETTY) {
		int last = '\n';
		int in = 0;

		do {
			if (last == '\n' && buf[in] == '<')
				in += 3;
			else {
				last = buf[in++];
				bb_putchar(last);
			}
		} while (in < len);
		if (last != '\n')
			bb_putchar('\n');
	} else {
		full_write(STDOUT_FILENO, buf, len);
		if (buf[len-1] != '\n')
			bb_putchar('\n');
	}

	if (ENABLE_FEATURE_CLEAN_UP) free(buf);

	return EXIT_SUCCESS;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	*
4	* dmesg - display/control kernel ring buffer.
5	*
6	* Copyright 2006 Rob Landley <rob@landley.net>
7	* Copyright 2006 Bernhard Reutner-Fischer <rep.nop@aon.at>
8	*
9	* Licensed under GPLv2, see file LICENSE in this tarball for details.
10	*/
11	#include <sys/klog.h>
12	#include "libbb.h"
13
14	int dmesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
15	int dmesg_main(int argc UNUSED_PARAM, char **argv)
16	{
17	int len, level;
18	char *buf;
19	unsigned opts;
20	enum {
21	OPT_c = 1 << 0,
22	OPT_s = 1 << 1,
23	OPT_n = 1 << 2
24	};
25
26	opt_complementary = "s+:n+"; /* numeric */
27	opts = getopt32(argv, "cs:n:", &len, &level);
28	if (opts & OPT_n) {
29	if (klogctl(8, NULL, (long) level))
30	bb_perror_msg_and_die("klogctl");
31	return EXIT_SUCCESS;
32	}
33
34	if (!(opts & OPT_s))
35	len = klogctl(10, NULL, 0); /* read ring buffer size */
36	if (len < 16*1024)
37	len = 16*1024;
38	if (len > 1610241024)
39	len = 1610241024;
40
41	buf = xmalloc(len);
42	len = klogctl(3 + (opts & OPT_c), buf, len); /* read ring buffer */
43	if (len < 0)
44	bb_perror_msg_and_die("klogctl");
45	if (len == 0)
46	return EXIT_SUCCESS;
47
48	/* Skip <#> at the start of lines, and make sure we end with a newline */
49
50	if (ENABLE_FEATURE_DMESG_PRETTY) {
51	int last = '\n';
52	int in = 0;
53
54	do {
55	if (last == '\n' && buf[in] == '<')
56	in += 3;
57	else {
58	last = buf[in++];
59	bb_putchar(last);
60	}
61	} while (in < len);
62	if (last != '\n')
63	bb_putchar('\n');
64	} else {
65	full_write(STDOUT_FILENO, buf, len);
66	if (buf[len-1] != '\n')
67	bb_putchar('\n');
68	}
69
70	if (ENABLE_FEATURE_CLEAN_UP) free(buf);
71
72	return EXIT_SUCCESS;
73	}