* fhandler.h (class fhandler_tty_common): New mutex and event to

syncronize input on master tty with slave tty.
* fhandler_tty.cc (fhandler_pty_master::accept_input): Use them to
syncronize with slave.
* fhandler_tty.cc (fhandler_tty_slave::read): Use input mutex and
event to syncronize with master. Do not limit amount of data read
from master to vmin value. Interrupt on signal and return already
read data, if any.
* fhandler_tty.cc (fhandler_tty_slave::open): Handle input mutex and
event.
* fhandler_tty.cc (fhandler_tty_common::close): Ditto.
* fhandler_tty.cc (fhandler_tty_common::set_close_on_exec): Ditto.
* fhandler_tty.cc (fhandler_tty_common::fixup_after_fork): Ditto.
* fhandler_tty.cc (fhandler_tty_common::dup): Ditto.
* tty.h (tty::open_input_mutex): New function.
* tty.cc (tty::common_init): Create input mutex and event.

1 files changed, 8 insertions, 0 deletions

diff --git a/winsup/cygwin/tty.h b/winsup/cygwin/tty.h
index bdd6eaedf..36f7ae19d 100644
--- a/winsup/cygwin/tty.h
+++ b/winsup/cygwin/tty.h
@@ -23,7 +23,9 @@ details. */
 #define IOCTL_REQUEST_EVENT	"cygtty%d.ioctl.request"
 #define IOCTL_DONE_EVENT	"cygtty%d.ioctl.done"
 #define RESTART_OUTPUT_EVENT	"cygtty%d.output.restart"
+#define INPUT_AVAILABLE_EVENT	"cygtty%d.input.avail"
 #define OUTPUT_MUTEX		"cygtty%d.output.mutex"
+#define INPUT_MUTEX		"cygtty%d.input.mutex"
 #define TTY_SLAVE_ALIVE		"cygtty%x.slave_alive"
 #define TTY_MASTER_ALIVE	"cygtty%x.master_alive"
 
@@ -111,6 +113,12 @@ public:
     __small_sprintf (buf, OUTPUT_MUTEX, ntty);
     return OpenMutex (MUTEX_ALL_ACCESS, inherit, buf);
   }
+  HANDLE open_input_mutex (BOOL inherit = FALSE)
+  {
+    char buf[80];
+    __small_sprintf (buf, INPUT_MUTEX, ntty);
+    return OpenMutex (MUTEX_ALL_ACCESS, inherit, buf);
+  }
   BOOL exists ()
   {
     HANDLE h = open_output_mutex ();