[PATCH] dtas-readahead: cleanup open files on pause

[Eric Wong <e@80x24.org>]

We must not leave open files lingering when the player pauses,
as it could prevent remote filesystems from unmounting.
---
 It's been a while, a new release should be coming end-of-week or so.

 bin/dtas-readahead | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/bin/dtas-readahead b/bin/dtas-readahead
index 97d5a89..b4b7311 100755
--- a/bin/dtas-readahead
+++ b/bin/dtas-readahead
@@ -149,8 +149,8 @@ def do_open(path)
   File.open(path)
 end
 
+work = {}
 begin
-  work = {}
   cur_pid = nil
   @todo_ra = @max_ra
   t0 = DTAS.now
@@ -159,13 +159,16 @@ def do_open(path)
   while @todo_ra > 0 && fp.nil?
     if current = cur['current']
       track = current['infile'].freeze
-      work[track] ||= fp = do_open(track)
+      fp = work[track] ||= do_open(track)
       cur_pid = current['pid']
       if fp
         pos = expand_pid(cur_pid).map do |pid|
           seek_to_cur_pos(pid, fp)
         end.compact.max
-        pos and fp = do_ra(fp, pos, w)
+        if pos
+          fp = do_ra(fp, pos, w)
+          work.delete_if { |_, io| io.closed? }
+        end
       end
     else
       break
@@ -176,10 +179,11 @@ def do_open(path)
     while @todo_ra > 0 && track = queue.shift
       fp = nil
       begin
-        work[track] ||= fp = do_open(track)
+        fp = work[track] ||= do_open(track)
       rescue SystemCallError
       end
       fp = do_ra(fp, 0, w) if fp
+      work.delete_if { |_, io| io.closed? }
     end
     break if @todo_ra <= 0
 
@@ -192,10 +196,11 @@ def do_open(path)
       fp = nil
       track = c.req("tl get #{cid}").sub!(/\A1 \d+=/, '').freeze
       begin
-        work[track] ||= fp = do_open(track)
+        fp = work[track] ||= do_open(track)
       rescue SystemCallError
       end
       fp = do_ra(fp, 0, w) if fp
+      work.delete_if { |_, io| io.closed? }
       if @todo_ra > 0 && fp.nil? && ids[idx += 1].nil?
         idx = repeat == 'true' ? 0 : nil
       end
@@ -210,7 +215,9 @@ def do_open(path)
     timeout = 5 - elapsed
     timeout = 0 if timeout < 0
   else
-    timeout = nil
+    work.each_value(&:close).clear
+    fp.close if fp && !fp.closed?
+    fp = timeout = nil
   end
   r = wait_read(w, timeout)
   p w.res_wait if r
-- 
EW