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Use NtQueryObject to detect closing the last master handle

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Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2015-05-28 16:06:49 +02:00
parent 3afe8808b9
commit 712811e9bb
2 changed files with 29 additions and 8 deletions
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8
winsup/cygwin/ChangeLog
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@ -1,3 +1,11 @@
2015-05-28 Takashi Yano <takashi.yano@nifty.ne.jp>
Corinna Vinschen <corinna@vinschen.de>
* fhandler_tty.cc (fhandler_pty_common::close): Don't close output_mutex
here. Move into callers.
(fhandler_pty_master::close): Use NtQueryObject instead of PeekNamedPipe
to detect closing the last master handle.
2015-05-27 Takashi Yano <takashi.yano@nifty.ne.jp>
* net.cc: Define _NETIOAPI_H_ to accomodate newer w32api.

29
winsup/cygwin/fhandler_tty.cc
View file

@ -552,7 +552,10 @@ fhandler_pty_slave::close ()
get_output_handle_cyg ());
if ((unsigned) myself->ctty == FHDEV (DEV_PTYS_MAJOR, get_minor ()))
fhandler_console::free_console (); /* assumes that we are the last pty closer */
return fhandler_pty_common::close ();
fhandler_pty_common::close ();
if (!ForceCloseHandle (output_mutex))
termios_printf ("CloseHandle (output_mutex<%p>), %E", output_mutex);
return 0;
}
int
@ -1201,8 +1204,6 @@ fhandler_pty_common::close ()
termios_printf ("pty%d <%p,%p> closing", get_minor (), get_handle (), get_output_handle ());
if (!ForceCloseHandle (input_mutex))
termios_printf ("CloseHandle (input_mutex<%p>), %E", input_mutex);
if (!ForceCloseHandle (output_mutex))
termios_printf ("CloseHandle (output_mutex<%p>), %E", output_mutex);
if (!ForceCloseHandle1 (get_handle (), from_pty))
termios_printf ("CloseHandle (get_handle ()<%p>), %E", get_handle ());
if (!ForceCloseHandle1 (get_output_handle (), to_pty))
@ -1223,6 +1224,9 @@ fhandler_pty_master::cleanup ()
int
fhandler_pty_master::close ()
{
OBJECT_BASIC_INFORMATION obi;
NTSTATUS status;
termios_printf ("closing from_master(%p)/to_master(%p)/to_master_cyg(%p) since we own them(%u)",
from_master, to_master, to_master_cyg, dwProcessId);
if (cygwin_finished_initializing)
@ -1251,13 +1255,22 @@ fhandler_pty_master::close ()
}
}
fhandler_pty_common::close ();
/* Check if the last master handle has been closed. If so, set
input_available_event to wake up potentially waiting slaves. */
if (!PeekNamedPipe (from_master, NULL, 0, NULL, NULL, NULL)
&& GetLastError () == ERROR_BROKEN_PIPE)
SetEvent (input_available_event);
acquire_output_mutex (INFINITE);
status = NtQueryObject (get_output_handle (), ObjectBasicInformation,
&obi, sizeof obi, NULL);
fhandler_pty_common::close ();
release_output_mutex ();
if (!ForceCloseHandle (output_mutex))
termios_printf ("CloseHandle (output_mutex<%p>), %E", output_mutex);
if (!NT_SUCCESS (status))
debug_printf ("NtQueryObject: %y", status);
else if (obi.HandleCount == 1)
{
termios_printf("Closing last master of pty%d", get_minor ());
SetEvent (input_available_event);
}
if (!ForceCloseHandle (from_master))
termios_printf ("error closing from_master %p, %E", from_master);