たとえば、
<dbx> trace step -in foo |
は、次のようなスクリプトと等価です。
# create handler in disabled state
when step -disable { echo Stepped to $line; }
t=$newhandlerid # remember handler id
when in foo {
# when entered foo enable the trace
handler -enable "$t"
# arrange so that upon returning from foo,
# the trace is disabled.
when returns { handler -disable "$t"; };
}
|