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authorRob Landley <rob@landley.net>2006-06-13 18:31:04 +0000
committerRob Landley <rob@landley.net>2006-06-13 18:31:04 +0000
commit7c7b0d74372da5fbde67513aa9ce162a555d4765 (patch)
tree4b95919b39b7f9b76ccc52829e84abd7979d5db4
parent18958e9309b6565245ae14a19aab947fb2da79aa (diff)
downloadbusybox-7c7b0d74372da5fbde67513aa9ce162a555d4765.tar.gz
Rewrite of dmesg, smaller and simpler.
-rw-r--r--util-linux/dmesg.c95
1 files changed, 25 insertions, 70 deletions
diff --git a/util-linux/dmesg.c b/util-linux/dmesg.c
index 2166edba3..6adba159a 100644
--- a/util-linux/dmesg.c
+++ b/util-linux/dmesg.c
@@ -1,80 +1,35 @@
-/* vi: set sw=4 ts=4: */
-/* dmesg.c -- Print out the contents of the kernel ring buffer
- * Created: Sat Oct 9 16:19:47 1993
- * Revised: Thu Oct 28 21:52:17 1993 by faith@cs.unc.edu
- * Copyright 1993 Theodore Ts'o (tytso@athena.mit.edu)
- * This program comes with ABSOLUTELY NO WARRANTY.
- * Modifications by Rick Sladkey (jrs@world.std.com)
- * Larger buffersize 3 June 1998 by Nicolai Langfeldt, based on a patch
- * by Peeter Joot. This was also suggested by John Hudson.
- * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
- * - added Native Language Support
+/* vi: set ts=4:
+ *
+ * dmesg - display/control kernel ring buffer.
*
- * from util-linux -- adapted for busybox by
- * Erik Andersen <andersen@codepoet.org>. I ripped out Native Language
- * Support, replaced getopt, added some gotos for redundant stuff.
+ * Copyring 2006 Rob Landley <rob@landley.net>
*
- * Audited and cleaned up on 7 March 2003 to reduce size of
- * check error handling by Erik Andersen <andersen@codepoet.org>
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <sys/klog.h>
-
#include "busybox.h"
+#include <unistd.h>
+#include <sys/klog.h>
-int dmesg_main(int argc, char **argv)
+int dmesg_main(int argc, char *argv[])
{
- char *buf, *tmp;
- int bufsize = 8196;
- int i, n = 0;
- int c = 3;
-
- i = bb_getopt_ulflags(argc, argv, "cn:s:", &buf, &tmp);
- if (i & 1)
- c = 4;
- if (i & 2) {
- c = 8;
- n = bb_xgetlarg(buf, 10, 0, 10);
- }
- if (i & 4)
- /* I think a 512k max kernel ring buffer is big enough for
- * anybody, as the default is 16k... Could be wrong though.
- * If so I'm sure I'll hear about it by the enraged masses*/
- bufsize = bb_xgetlarg(tmp, 10, 4096, 512*1024);
-
- if (c == 8) {
- if (klogctl(c, NULL, n) < 0)
- goto die_the_death;
- goto all_done;
- }
-
- buf = xmalloc(bufsize);
- if ((n = klogctl(c, buf, bufsize)) < 0)
- goto die_the_death;
-
- c = '\n';
- for (i = 0; i < n; i++) {
- if (c == '\n' && buf[i] == '<') {
- i++;
- while (buf[i] >= '0' && buf[i] <= '9')
- i++;
- if (buf[i] == '>')
- i++;
- }
- c = buf[i];
- putchar(c);
- }
- if (c != '\n')
- putchar('\n');
-all_done:
- if (ENABLE_FEATURE_CLEAN_UP) {
- free(buf);
+ char *size, *level;
+ int flags = bb_getopt_ulflags(argc, argv, "c:s:n:", &size, &level);
+
+ if (flags & 4) {
+ if(klogctl(8, NULL, bb_xgetlarg(size, 10, 0, 10)))
+ bb_perror_msg_and_die("klogctl");
+ } else {
+ int len;
+ char *buf;
+
+ len = (flags & 2) ? bb_xgetlarg(size, 10, 4096, INT_MAX) : 16384;
+ buf = xmalloc(len);
+ if (0 > (len = klogctl(3 + (flags & 1), buf, len)))
+ bb_perror_msg_and_die("klogctl");
+ write(1,buf,len);
+ if (len && buf[len-1]!='\n') putchar('\n');
}
- return EXIT_SUCCESS;
-die_the_death:
- bb_perror_nomsg_and_die();
+ return 0;
}