1/* vi: set sw=4 ts=4: */ 2/* 3 * 4 * dmesg - display/control kernel ring buffer. 5 * 6 * Copyright 2006 Rob Landley <rob@landley.net> 7 * Copyright 2006 Bernhard Fischer <rep.nop@aon.at> 8 * 9 * Licensed under GPLv2, see file LICENSE in this tarball for details. 10 */ 11 12#include <sys/klog.h> 13#include "libbb.h" 14 15int dmesg_main(int argc, char **argv); 16int dmesg_main(int argc, char **argv) 17{ 18 char *size, *level; 19 int flags = getopt32(argv, "cs:n:", &size, &level); 20 21 if (flags & 4) { 22 if (klogctl(8, NULL, xatoul_range(level, 0, 10))) 23 bb_perror_msg_and_die("klogctl"); 24 } else { 25 int len; 26 char *buf; 27 28 len = (flags & 2) ? xatoul_range(size, 2, INT_MAX) : 16384; 29 buf = xmalloc(len); 30 if (0 > (len = klogctl(3 + (flags & 1), buf, len))) 31 bb_perror_msg_and_die("klogctl"); 32 33 // Skip <#> at the start of lines, and make sure we end with a newline. 34 35 if (ENABLE_FEATURE_DMESG_PRETTY) { 36 int last = '\n'; 37 int in; 38 39 for (in = 0; in<len;) { 40 if (last == '\n' && buf[in] == '<') in += 3; 41 else putchar(last = buf[in++]); 42 } 43 if (last != '\n') putchar('\n'); 44 } else { 45 write(1,buf,len); 46 if (len && buf[len-1]!='\n') putchar('\n'); 47 } 48 49 if (ENABLE_FEATURE_CLEAN_UP) free(buf); 50 } 51 52 return 0; 53} 54