-#include "internal.h"
-#include <stdlib.h>
-#include <unistd.h>
-#include <time.h>
-
+/* 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)
- * from util-linux; adapted for busybox
+ * 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
+ *
+ * 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.
+ *
+ * Audited and cleaned up on 7 March 2003 to reduce size of
+ * check error handling by Erik Andersen <andersen@codepoet.org>
*/
-#include <linux/unistd.h>
#include <stdio.h>
+#include <stdlib.h>
#include <getopt.h>
-
-#define __NR_klog __NR_syslog
-
-#if defined(__GLIBC__)
+#include <errno.h>
#include <sys/klog.h>
-#define klog klogctl
-#else
-static inline _syscall3(int,klog,int,type,char *,b,int,len)
-#endif /* __GLIBC__ */
-const char dmesg_usage[] = "dmesg";
+#include "busybox.h"
-int
-dmesg_main(int argc, char * * argv)
+int dmesg_main(int argc, char **argv)
{
+ char *buf
+#ifdef CONFIG_FEATURE_CLEAN_UP
+ = NULL
+#endif
+ ;
+ int bufsize = 8196;
+ int i, n;
+ int level = 0;
+ int lastc;
+ int cmd = 3;
- char buf[4096];
- int i;
- int n;
- int c;
- int level = 0;
- int lastc;
- int cmd = 3;
+ while ((i = getopt(argc, argv, "cn:s:")) > 0) {
+ switch (i) {
+ case 'c':
+ cmd = 4;
+ break;
+ case 'n':
+ cmd = 8;
+ level = bb_xgetlarg(optarg, 10, 0, 10);
+ break;
+ case 's':
+ /* 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(optarg, 10, 4096, 512*1024);
+ break;
+ default:
+ bb_show_usage();
+ }
+ }
- while ((c = getopt( argc, argv, "cn:" )) != EOF) {
- switch (c) {
- case 'c':
- cmd = 4;
- break;
- case 'n':
- cmd = 8;
- level = atoi(optarg);
- break;
- case '?':
- default:
- fprintf(stderr, "%s\n", dmesg_usage);
- exit(1);
- }
- }
- argc -= optind;
- argv += optind;
-
- if (argc > 1) {
- fprintf(stderr, "%s\n", dmesg_usage);
- exit(1);
- }
+ if (optind < argc) {
+ bb_show_usage();
+ }
- if (cmd == 8) {
- n = klog( cmd, NULL, level );
- if (n < 0) {
- perror( "klog" );
- exit( 1 );
- }
- exit( 0 );
- }
+ if (cmd == 8) {
+ if (klogctl(cmd, NULL, level) < 0)
+ goto die_the_death;
+ goto all_done;
+ }
- n = klog( cmd, buf, sizeof( buf ) );
- if (n < 0) {
- perror( "klog" );
- exit( 1 );
- }
+ buf = xmalloc(bufsize);
+ if ((n = klogctl(cmd, buf, bufsize)) < 0)
+ goto die_the_death;
- lastc = '\n';
- for (i = 0; i < n; i++) {
- if ((i == 0 || buf[i - 1] == '\n') && buf[i] == '<') {
- i++;
- while (buf[i] >= '0' && buf[i] <= '9')
- i++;
- if (buf[i] == '>')
- i++;
- }
- lastc = buf[i];
- putchar( lastc );
- }
- if (lastc != '\n')
- putchar( '\n' );
- return 0;
+ lastc = '\n';
+ for (i = 0; i < n; i++) {
+ if (lastc == '\n' && buf[i] == '<') {
+ i++;
+ while (buf[i] >= '0' && buf[i] <= '9')
+ i++;
+ if (buf[i] == '>')
+ i++;
+ }
+ lastc = buf[i];
+ putchar(lastc);
+ }
+ if (lastc != '\n')
+ putchar('\n');
+all_done:
+#ifdef CONFIG_FEATURE_CLEAN_UP
+ if (buf) {
+ free(buf);
+ }
+#endif
+ return EXIT_SUCCESS;
+die_the_death:
+ bb_perror_nomsg_and_die();
}