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Cygwin: FIFO: don't read from pipes that are closing

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Don't try to read from fifo_client_handlers that are in the fc_closing
state.  Experiments have shown that this always yields
STATUS_PIPE_BROKEN, so it just wastes a Windows system call.

Re-order the values in enum fifo_client_connect_state to reflect the
new status of fc_closing.
This commit is contained in:
Ken Brown
2020-08-03 09:35:00 -04:00
parent 289af73a89
commit 251624a352
3 changed files with 5 additions and 12 deletions
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2
winsup/cygwin/select.cc
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@@ -878,7 +878,7 @@ peek_fifo (select_record *s, bool from_select)
{
fifo_client_handler &fc = fh->get_fc_handler (i);
fc.query_and_set_state ();
if (fc.get_state () >= fc_closing)
if (fc.get_state () >= fc_connected)
{
nconnected++;
if (fc.get_state () == fc_input_avail)