--- /dev/null
+set ::tmpcounter 0
+set ::tmproot "./tests/tmp"
+file mkdir $::tmproot
+
+# returns a dirname unique to this process to write to
+proc tmpdir {basename} {
+ set dir [file join $::tmproot $basename.[pid].[incr ::tmpcounter]]
+ file mkdir $dir
+ set _ $dir
+}
+
+# return a filename unique to this process to write to
+proc tmpfile {basename} {
+ file join $::tmproot $basename.[pid].[incr ::tmpcounter]
+}