* fhandler.h (fhandler_tty_slave): Declare new methods.

* select.cc (fhandler_tty_slave::select_read): New method.
* select.cc (fhandler_tty_slave::ready_for_read): Ditto.
* select.cc (verify_tty_slave): New function.
* fhandler_termios.cc (fhandler_termios::line_edit): Empty input
buffer on signal.
* fhandler_tty.cc (fhandler_tty_slave::read): Check for input data
after reading from pipe. Reset event if input pipe is empty.
* tty.h (class tty): Allow creating events with manual reset.
* tty.cc (tty::get_event): Use manual_reset flag.
* tty.cc (tty::common_init): Create input_available_event with
manual reset.

7 files changed, 83 insertions, 7 deletions

diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 9d9016046..6c95644e3 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,18 @@
+2001-03-18  Egor Duda <deo@logos-m.ru>
+
+	* fhandler.h (fhandler_tty_slave): Declare new methods.
+	* select.cc (fhandler_tty_slave::select_read): New method.
+	* select.cc (fhandler_tty_slave::ready_for_read): Ditto.
+	* select.cc (verify_tty_slave): New function.
+	* fhandler_termios.cc (fhandler_termios::line_edit): Empty input
+	buffer on signal.
+	* fhandler_tty.cc (fhandler_tty_slave::read): Check for input data
+	after reading from pipe. Reset event if input pipe is empty.
+	* tty.h (class tty): Allow creating events with manual reset.
+	* tty.cc (tty::get_event): Use manual_reset flag.
+	* tty.cc (tty::common_init): Create input_available_event with
+	manual reset.
+
 Sat Mar 17 21:48:03 2001  Christopher Faylor <cgf@cygnus.com>
 
 	* external.cc (fillout_pinfo): Match windows pid, as well as cygwin pid
diff --git a/winsup/cygwin/fhandler.h b/winsup/cygwin/fhandler.h
index 7e827571e..90ded24bd 100644
--- a/winsup/cygwin/fhandler.h
+++ b/winsup/cygwin/fhandler.h
@@ -761,6 +761,8 @@ public:
   int ioctl (unsigned int cmd, void *);
 
   off_t lseek (off_t, int) { return 0; }
+  select_record *select_read (select_record *s);
+  int ready_for_read (int fd, DWORD howlong, int ignra);
 };
 
 class fhandler_pty_master: public fhandler_tty_common
diff --git a/winsup/cygwin/fhandler_termios.cc b/winsup/cygwin/fhandler_termios.cc
index 948de94dc..6d4e4e9a8 100644
--- a/winsup/cygwin/fhandler_termios.cc
+++ b/winsup/cygwin/fhandler_termios.cc
@@ -209,6 +209,7 @@ fhandler_termios::line_edit (const char *rptr, int nread, int always_accept)
 	    goto not_a_sig;
 
 	  termios_printf ("got interrupt %d, sending signal %d", c, sig);
+	  eat_readahead (-1);
 	  kill_pgrp (tc->getpgid (), sig);
 	  tc->ti.c_lflag &= ~FLUSHO;
 	  sawsig = 1;
diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index 5cca97b4d..a2e815e66 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -614,6 +614,7 @@ fhandler_tty_slave::read (void *ptr, size_t len)
   size_t readlen;
   DWORD bytes_in_pipe;
   char buf[INP_BUFFER_SIZE];
+  char peek_buf[INP_BUFFER_SIZE];
   DWORD time_to_wait;
   DWORD rc;
   HANDLE w4[2];
@@ -667,7 +668,7 @@ fhandler_tty_slave::read (void *ptr, size_t len)
 	  termios_printf ("failed to acquire input mutex after input event arrived");
 	  break;
 	}
-      if (!PeekNamedPipe (get_handle (), NULL, 0, NULL, &bytes_in_pipe, NULL))
+      if (!PeekNamedPipe (get_handle (), peek_buf, sizeof(peek_buf), &bytes_in_pipe, NULL, NULL))
 	{
 	  termios_printf ("PeekNamedPipe failed, %E");
 	  _raise (SIGHUP);
@@ -682,6 +683,16 @@ fhandler_tty_slave::read (void *ptr, size_t len)
 	      termios_printf ("read failed, %E");
 	      _raise (SIGHUP);
 	    }
+          /* MSDN states that 5th prameter can be used to determine total
+             number of bytes in pipe, but for some reason this number doesn't
+             change after successful read. So we have to peek into the pipe
+             again to see if input is still available */
+          if (!PeekNamedPipe (get_handle (), peek_buf, 1, &bytes_in_pipe, NULL, NULL))
+	    {
+	      termios_printf ("PeekNamedPipe failed, %E");
+	      _raise (SIGHUP);
+	      bytes_in_pipe = 0;
+	    }
 	  if (n)
 	    {
 	      len -= n;
@@ -691,8 +702,8 @@ fhandler_tty_slave::read (void *ptr, size_t len)
 	    }
 	}
 
-      if (readlen != bytes_in_pipe)
-	SetEvent (input_available_event);
+      if (!bytes_in_pipe)
+	ResetEvent (input_available_event);
 
       ReleaseMutex (input_mutex);
 
diff --git a/winsup/cygwin/select.cc b/winsup/cygwin/select.cc
index 64c6ebb47..1823cd1c4 100644
--- a/winsup/cygwin/select.cc
+++ b/winsup/cygwin/select.cc
@@ -743,6 +743,53 @@ fhandler_tty_common::select_except (select_record *s)
   return ((fhandler_pipe *)this)->fhandler_pipe::select_except (s);
 }
 
+static int
+verify_tty_slave (select_record *me, fd_set *readfds, fd_set *writefds,
+	   fd_set *exceptfds)
+{
+  if (WaitForSingleObject (me->h, 0) == WAIT_OBJECT_0)
+    me->read_ready = 1;
+  return set_bits (me, readfds, writefds, exceptfds);
+}
+
+select_record *
+fhandler_tty_slave::select_read (select_record *s)
+{
+  if (!s)
+    s = new select_record;
+  s->h = input_available_event;
+  s->startup = no_startup;
+  s->poll = poll_pipe;
+  s->verify = verify_tty_slave;
+  s->read_selected = TRUE;
+  s->cleanup = NULL;
+  return s;
+}
+
+int
+fhandler_tty_slave::ready_for_read (int fd, DWORD howlong, int ignra)
+{
+  HANDLE w4[2];
+  if (!ignra && get_readahead_valid ())
+    {
+      select_printf ("readahead");
+      return 1;
+    }
+  w4[0] = signal_arrived;
+  w4[1] = input_available_event;
+  switch (WaitForMultipleObjects (2, w4, FALSE, howlong))
+    {
+    case WAIT_OBJECT_0 + 1:
+      return 1;
+    case WAIT_FAILED:
+      select_printf ( "wait failed %E" );
+    case WAIT_OBJECT_0:
+    case WAIT_TIMEOUT:
+    default:
+      return 0;
+    }
+}
+
 select_record *
 fhandler_dev_null::select_read (select_record *s)
 {
diff --git a/winsup/cygwin/tty.cc b/winsup/cygwin/tty.cc
index 798984418..424cf7112 100644
--- a/winsup/cygwin/tty.cc
+++ b/winsup/cygwin/tty.cc
@@ -325,13 +325,13 @@ tty::init (void)
 }
 
 HANDLE
-tty::get_event (const char *fmt, BOOL inherit)
+tty::get_event (const char *fmt, BOOL inherit, BOOL manual_reset)
 {
   HANDLE hev;
   char buf[40];
 
   __small_sprintf (buf, fmt, ntty);
-  if (!(hev = CreateEvent (inherit ? &sec_all : &sec_all_nih, FALSE, FALSE, buf)))
+  if (!(hev = CreateEvent (inherit ? &sec_all : &sec_all_nih, manual_reset, FALSE, buf)))
     {
       termios_printf ("couldn't create %s", buf);
       set_errno (ENOENT);	/* FIXME this can't be the right errno */
@@ -408,7 +408,7 @@ tty::common_init (fhandler_pty_master *ptym)
 	return FALSE;
     }
 
-  if (!(ptym->input_available_event = get_event (INPUT_AVAILABLE_EVENT, FALSE)))
+  if (!(ptym->input_available_event = get_event (INPUT_AVAILABLE_EVENT, FALSE, TRUE)))
     return FALSE;
 
   char buf[40];
diff --git a/winsup/cygwin/tty.h b/winsup/cygwin/tty.h
index 36f7ae19d..43a82e0e4 100644
--- a/winsup/cygwin/tty.h
+++ b/winsup/cygwin/tty.h
@@ -86,7 +86,7 @@ class fhandler_pty_master;
 
 class tty: public tty_min
 {
-  HANDLE get_event (const char *fmt, BOOL inherit);
+  HANDLE get_event (const char *fmt, BOOL inherit, BOOL manual_reset = FALSE);
 public:
   HWND  hwnd;	/* Console window handle tty belongs to */