+/* 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
* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
* - added Native Language Support
*
- * from util-linux -- adapted for busybox by
- * Erik Andersen <andersee@debian.org>. I ripped out Native Language
+ * 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 "internal.h"
-#include <linux/unistd.h>
#include <stdio.h>
-#include <getopt.h>
#include <stdlib.h>
+#include <getopt.h>
+#include <errno.h>
+#include <sys/klog.h>
-#if __GNU_LIBRARY__ < 5
-
-#ifndef __alpha__
-# define __NR_klogctl __NR_syslog
- static inline _syscall3(int, klogctl, int, type, char *, b, int, len);
-#else /* __alpha__ */
-#define klogctl syslog
-#endif
-
-#else
-# include <sys/klog.h>
-#endif
-
-static const char dmesg_usage[] = "dmesg [-c] [-n level] [-s bufsize]\n";
+#include "busybox.h"
-int dmesg_main( int argc, char** argv )
+int dmesg_main(int argc, char **argv)
{
- char *buf;
- int bufsize=8196;
- int i;
- int n;
- int level = 0;
- int lastc;
- int cmd = 3;
+ char *buf
+#ifdef CONFIG_FEATURE_CLEAN_UP
+ = NULL
+#endif
+ ;
+ int bufsize = 8196;
+ int i, n;
+ int level = 0;
+ int lastc;
+ int cmd = 3;
- /* Parse any options */
- while (argc && **argv == '-') {
- while (*++(*argv))
- switch (**argv) {
- case 'c':
- cmd = 4;
- break;
- case 'n':
- cmd = 8;
- if (--argc == 0)
- goto end;
- level = atoi (*(++argv));
- --argc;
- ++argv;
- break;
- case 's':
- if (--argc == 0)
- goto end;
- bufsize = atoi (*(++argv));
- --argc;
- ++argv;
- break;
- default:
- goto end;
- }
- }
-
- if (argc > 1) {
- goto end;
- }
+ 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();
+ }
+ }
- if (cmd == 8) {
- n = klogctl( cmd, NULL, level );
- if (n < 0) {
- goto klogctl_error;
- }
- exit( TRUE );
- }
+ if (optind < argc) {
+ bb_show_usage();
+ }
- if (bufsize < 4096) bufsize = 4096;
- buf = (char*)malloc(bufsize);
- n = klogctl( cmd, buf, bufsize );
- if (n < 0) {
- goto klogctl_error;
- }
+ if (cmd == 8) {
+ if (klogctl(cmd, NULL, level) < 0)
+ goto die_the_death;
+ goto all_done;
+ }
- 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' );
- exit( TRUE);
-end:
- usage( dmesg_usage);
- exit (FALSE);
-klogctl_error:
- perror( "klogctl" );
- exit( FALSE );
+ buf = xmalloc(bufsize);
+ if ((n = klogctl(cmd, buf, bufsize)) < 0)
+ goto die_the_death;
+ 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();
}