From 6f1582633a925e956d6a24e9cfeefe3c4c53d6be Mon Sep 17 00:00:00 2001
From: duda <duda>
Date: Fri, 27 Apr 2001 06:27:28 +0000
Subject: [PATCH] * tty.cc (tty::make_pipes): Set to_slave pipe mode to
 nonblocking. * fhandler_tty.cc (fhandler_pty_master::accept_input): If pipe
 buffer is full, give slave a chance to read data.

---
 winsup/cygwin/ChangeLog       |  6 ++++++
 winsup/cygwin/fhandler_tty.cc | 30 ++++++++++++++++++++++++++----
 winsup/cygwin/tty.cc          |  4 ++++
 3 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 50f23f7c44..243d819093 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,9 @@
+2001-04-27  Egor Duda  <deo@logos-m.ru>
+
+	* tty.cc (tty::make_pipes): Set to_slave pipe mode to nonblocking.
+	* fhandler_tty.cc (fhandler_pty_master::accept_input): If pipe buffer
+	is full, give slave a chance to read data.
+
 2001-04-26  Kazuhiro Fujieda  <fujieda@jaist.ac.jp>
 
         * security.cc (alloc_sd): Add unrelated ACCESS_ALLOWED_ACE behind
diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index e33d1d31ba..acb10a93db 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -167,18 +167,40 @@ fhandler_pty_master::doecho (const void *str, DWORD len)
 int
 fhandler_pty_master::accept_input ()
 {
-  DWORD written;
+  DWORD bytes_left, written;
   DWORD n;
   DWORD rc;
+  char* p;
 
   rc = WaitForSingleObject (input_mutex, INFINITE);
 
-  n = get_ttyp ()->read_retval = eat_readahead (-1);
+  bytes_left = n = eat_readahead (-1);
+  get_ttyp ()->read_retval = 0;
+  p = rabuf;
 
   if (n != 0)
     {
-      termios_printf ("about to write %d chars to slave", n);
-      rc = WriteFile (get_output_handle (), rabuf, n, &written, NULL);
+      while (bytes_left > 0)
+	{
+	  termios_printf ("about to write %d chars to slave", bytes_left);
+	  rc = WriteFile (get_output_handle (), p, bytes_left, &written, NULL);
+	  if (!rc)
+	    {
+	      debug_printf ("error writing to pipe %E");
+	      break;
+	    }
+	  get_ttyp ()->read_retval += written;
+	  p += written;
+	  bytes_left -= written;
+	  if (bytes_left > 0)
+	    {
+	      debug_printf ("to_slave pipe is full");
+	      SetEvent (input_available_event);
+	      ReleaseMutex (input_mutex);
+	      Sleep (10);
+	      rc = WaitForSingleObject (input_mutex, INFINITE);
+	    }
+	}
     }
   else
     termios_printf ("sending EOF to slave");
diff --git a/winsup/cygwin/tty.cc b/winsup/cygwin/tty.cc
index 768c21cd20..36ff39cd88 100644
--- a/winsup/cygwin/tty.cc
+++ b/winsup/cygwin/tty.cc
@@ -367,6 +367,10 @@ tty::make_pipes (fhandler_pty_master *ptym)
   ProtectHandle1 (from_slave, from_pty);
   termios_printf ("tty%d from_slave %p, to_slave %p", ntty, from_slave,
 		  to_slave);
+
+  DWORD pipe_mode = PIPE_NOWAIT;
+  if (!SetNamedPipeHandleState (to_slave, &pipe_mode, NULL, NULL))
+    termios_printf ("can't set to_slave to non-blocking mode");
   ptym->set_io_handle (from_slave);
   ptym->set_output_handle (to_slave);
   return TRUE;
-- 
2.11.0