| /* vi: set sw=4 ts=4: */ |
| /* |
| * dmesg.c - display/control kernel ring buffer. |
| * |
| * Copyright 2006, 2007 Rob Landley <rob@landley.net> |
| * |
| * Not in SUSv3. |
| */ |
| |
| #include "toys.h" |
| #include <sys/klog.h> |
| |
| #define TT toy.dmesg |
| |
| void dmesg_main(void) |
| { |
| // For -n just tell kernel to which messages to keep. |
| if (toys.optflags & 2) { |
| if (klogctl(8, NULL, TT.level)) |
| error_exit("klogctl"); |
| } else { |
| int size, i, last = '\n'; |
| char *data; |
| |
| // Figure out how much data we need, and fetch it. |
| size = TT.size; |
| if (size<2) size = 16384; |
| data = xmalloc(size); |
| size = klogctl(3 + (toys.optflags&1), data, size); |
| if (size < 0) error_exit("klogctl"); |
| |
| // Display data, filtering out level markers. |
| for (i=0; i<size; ) { |
| if (last=='\n' && data[i]=='<') i += 3; |
| else xputc(last = data[i++]); |
| } |
| if (last!='\n') xputc('\n'); |
| if (CFG_TOYBOX_FREE) free(data); |
| } |
| } |