mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-01 15:40:38 +00:00
99 lines
1.7 KiB
C
99 lines
1.7 KiB
C
#include "internal.h"
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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/* dmesg.c -- Print out the contents of the kernel ring buffer
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* Created: Sat Oct 9 16:19:47 1993
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* Revised: Thu Oct 28 21:52:17 1993 by faith@cs.unc.edu
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* Copyright 1993 Theodore Ts'o (tytso@athena.mit.edu)
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* This program comes with ABSOLUTELY NO WARRANTY.
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* Modifications by Rick Sladkey (jrs@world.std.com)
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* from util-linux; adapted for busybox
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*/
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#include <linux/unistd.h>
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#include <stdio.h>
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#define __NR_klog __NR_syslog
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#if defined(__GLIBC__)
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#include <sys/klog.h>
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#define klog klogctl
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#else
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static inline _syscall3 (int, klog, int, type, char *, b, int, len)
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#endif /* __GLIBC__ */
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static const char dmesg_usage[] = "dmesg [-c] [-n level]\n";
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int dmesg_main (int argc, char **argv)
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{
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char buf[4096];
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int i;
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int n;
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int level = 0;
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int lastc;
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int cmd = 3;
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argc--;
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argv++;
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/* Parse any options */
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while (argc && **argv == '-') {
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while (*++(*argv))
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switch (**argv) {
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case 'c':
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cmd = 4;
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break;
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case 'n':
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cmd = 8;
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if (--argc == 0)
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goto end;
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level = atoi (*(++argv));
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--argc;
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++argv;
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break;
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default:
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goto end;
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}
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}
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if (cmd == 8) {
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n = klog (cmd, NULL, level);
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if (n < 0) {
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perror ("klog");
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exit (FALSE);
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}
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exit (TRUE);
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}
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n = klog (cmd, buf, sizeof (buf));
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if (n < 0) {
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perror ("klog");
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exit (FALSE);
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}
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lastc = '\n';
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for (i = 0; i < n; i++) {
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if ((i == 0 || buf[i - 1] == '\n') && buf[i] == '<') {
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i++;
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while (buf[i] >= '0' && buf[i] <= '9')
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i++;
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if (buf[i] == '>')
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i++;
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}
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lastc = buf[i];
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putchar (lastc);
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}
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if (lastc != '\n')
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putchar ('\n');
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exit (TRUE);
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end:
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usage( dmesg_usage);
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exit (FALSE);
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}
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