| /* 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 |
| * |
| * 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 <stdio.h> |
| #include <stdlib.h> |
| #include <getopt.h> |
| #include <errno.h> |
| #include <sys/klog.h> |
| |
| #include "busybox.h" |
| |
| int dmesg_main(int argc, char **argv) |
| { |
| char *buf; |
| int bufsize = 8196; |
| int i, n; |
| 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(); |
| } |
| } |
| |
| if (optind < argc) { |
| bb_show_usage(); |
| } |
| |
| if (cmd == 8) { |
| if (klogctl(cmd, NULL, level) < 0) |
| goto die_the_death; |
| goto all_done; |
| } |
| |
| 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(); |
| } |