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Cygwin: FIFO: fix the error checking in raw_read 

If the pipe is empty, we can get either ERROR_NO_DATA or
ERROR_PIPE_LISTENING.
This commit is contained in:
Ken Brown 2019-04-14 19:15:58 +00:00 committed by Corinna Vinschen
parent 0c72e766e2
commit 513f050cbf
1 changed files with 5 additions and 8 deletions
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13
winsup/cygwin/fhandler_fifo.cc
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@ -749,19 +749,16 @@ fhandler_fifo::raw_read (void *in_ptr, size_t& len)
fifo_client_unlock ();
return;
}
/* In the duplex case with no data, we seem to get nread
== -1 with ERROR_PIPE_LISTENING on the first attempt to
read from the duplex pipe (fc_handler[0]), and nread == 0
on subsequent attempts. */
/* If the pipe is empty, we usually get nread == -1 with
ERROR_NO_DATA or ERROR_PIPE_LISTENING. An exception is
that in the duplex case we may get nread == 0 when we
attempt to read from the duplex pipe (fc_handler[0]). */
else if (nread < 0)
switch (GetLastError ())
{
case ERROR_NO_DATA:
break;
case ERROR_PIPE_LISTENING:
if (_duplexer && i == 0)
break;
/* Fall through. */
break;
default:
fifo_client_unlock ();
goto errout;