term% cat index.txt BTRACE(8) System Manager's Manual BTRACE(8)
NAME
btrace - trace bitblt protocol
SYNOPSIS
btrace [ -d [ d ]] [ -o ofile ] [ -b bfile ]
DESCRIPTION
Btrace eavesdrops on messages to and from /dev/bitblt, interprets them
as messages in the bit device protocol (see bit(3)), and prints a read‐
able version of the messages on a trace file, btrace.out by default.
After btrace is started, it runs in the background, tracing all subse‐
quent graphics programs run in that window. Options for btrace are:
-o ofile Print trace output in ofile instead of btrace.out.
-b bfile Dump each bitmap read or written to bfile, using the format
of bitmap(6). Each succeeding bitmap overwrites the previous
contents of file. Tweak(1) or showimage(7) can be used to
examine the file.
-d Increase the level of trace detail. The maximum level is
-dd.
FILES
/dev/bitblt
SOURCE
/sys/src/cmd/btrace.c
SEE ALSO
bit(3), bitmap(6), graphics(2), tweak(1), showimage(7)
BTRACE(8)