core: Replace the posix close notify mechanism by a new generic one.

* src/fdtable.c, src/fdtable.h: New.
* src/posix-io.c (notify_table_item_s): Remove.
(notify_table, notify_table_size, notify_table_lock): Remove.
(_gpgme_io_pipe): Put new fds into the table.
(_gpgme_io_dup): Ditto.
(_gpgme_io_close): Replace notify stuff by a call to the fdtable.
(_gpgme_io_set_close_notify): Remove.  Change all callers to to use
_gpgme_fdtable_add_close_notify.
* src/Makefile.am (main_sources): Add new files.
--

This is the first part or a larger change to unify the tracking of
file descriptors.  Right now this has only been implemented for
Posix and thus the code will not yet build for Windows.

Signed-off-by: Werner Koch <[email protected]>

1 files changed, 43 insertions, 0 deletions

diff --git a/src/fdtable.h b/src/fdtable.h
new file mode 100644
index 00000000..6038b249
--- /dev/null
+++ b/src/fdtable.h
@@ -0,0 +1,43 @@
+/* fdtable.h - Keep track of file descriptors.
+ * Copyright (C) 2019 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#ifndef GPGME_FDTABLE_H
+#define GPGME_FDTABLE_H
+
+/* The handler type associated with an FD.  It is called with the FD
+ * and the registered pointer.  The handler may return an error code
+ * but there is no guarantee that this code is used; in particular
+ * errors from close notifications can't inhibit the the closing.  */
+typedef gpg_error_t (*fdtable_handler_t) (int, void*);
+
+
+/* Insert a new FD into the table.  */
+gpg_error_t _gpgme_fdtable_insert (int fd);
+
+/* Add a close notification handler to the FD item.  */
+gpg_error_t _gpgme_fdtable_add_close_notify (int fd,
+                                             fdtable_handler_t handler,
+                                             void *value);
+
+/* Remove FD from the table.  This also runs the close handlers.  */
+gpg_error_t _gpgme_fdtable_remove (int fd);
+
+
+#endif /*GPGME_FDTABLE_H*/