/*
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*
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* BlueZ - Bluetooth protocol stack for Linux
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*
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* Copyright (C) 2012-2014 Intel Corporation. All rights reserved.
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*
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <errno.h>
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#include <glib.h>
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#include "io.h"
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struct io_watch {
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struct io *io;
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guint id;
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io_callback_func_t callback;
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io_destroy_func_t destroy;
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void *user_data;
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};
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struct io {
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int ref_count;
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GIOChannel *channel;
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struct io_watch *read_watch;
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struct io_watch *write_watch;
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struct io_watch *disconnect_watch;
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};
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static struct io *io_ref(struct io *io)
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{
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if (!io)
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return NULL;
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__sync_fetch_and_add(&io->ref_count, 1);
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return io;
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}
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static void io_unref(struct io *io)
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{
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if (!io)
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return;
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if (__sync_sub_and_fetch(&io->ref_count, 1))
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return;
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g_free(io);
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}
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struct io *io_new(int fd)
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{
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struct io *io;
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if (fd < 0)
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return NULL;
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io = g_try_new0(struct io, 1);
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if (!io)
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return NULL;
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io->channel = g_io_channel_unix_new(fd);
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g_io_channel_set_encoding(io->channel, NULL, NULL);
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g_io_channel_set_buffered(io->channel, FALSE);
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g_io_channel_set_close_on_unref(io->channel, FALSE);
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return io_ref(io);
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}
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static void watch_destroy(void *user_data)
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{
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struct io_watch *watch = user_data;
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struct io *io = watch->io;
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if (watch == io->read_watch)
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io->read_watch = NULL;
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else if (watch == io->write_watch)
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io->write_watch = NULL;
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else if (watch == io->disconnect_watch)
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io->disconnect_watch = NULL;
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if (watch->destroy)
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watch->destroy(watch->user_data);
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io_unref(watch->io);
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g_free(watch);
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}
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void io_destroy(struct io *io)
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{
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if (!io)
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return;
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if (io->read_watch) {
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g_source_remove(io->read_watch->id);
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io->read_watch = NULL;
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}
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if (io->write_watch) {
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g_source_remove(io->write_watch->id);
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io->write_watch = NULL;
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}
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if (io->disconnect_watch) {
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g_source_remove(io->disconnect_watch->id);
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io->disconnect_watch = NULL;
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}
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g_io_channel_unref(io->channel);
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io->channel = NULL;
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io_unref(io);
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}
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int io_get_fd(struct io *io)
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{
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if (!io)
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return -ENOTCONN;
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return g_io_channel_unix_get_fd(io->channel);
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}
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bool io_set_close_on_destroy(struct io *io, bool do_close)
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{
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if (!io)
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return false;
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if (do_close)
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g_io_channel_set_close_on_unref(io->channel, TRUE);
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else
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g_io_channel_set_close_on_unref(io->channel, FALSE);
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return true;
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}
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static gboolean watch_callback(GIOChannel *channel, GIOCondition cond,
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gpointer user_data)
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{
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struct io_watch *watch = user_data;
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bool result, destroy;
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destroy = watch == watch->io->disconnect_watch;
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if (!destroy && (cond & (G_IO_ERR | G_IO_NVAL)))
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return FALSE;
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if (watch->callback)
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result = watch->callback(watch->io, watch->user_data);
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else
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result = false;
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return result ? TRUE : FALSE;
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}
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static struct io_watch *watch_new(struct io *io, GIOCondition cond,
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io_callback_func_t callback, void *user_data,
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io_destroy_func_t destroy)
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{
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struct io_watch *watch;
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int prio;
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watch = g_try_new0(struct io_watch, 1);
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if (!watch)
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return NULL;
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watch->io = io_ref(io);
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watch->callback = callback;
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watch->destroy = destroy;
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watch->user_data = user_data;
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prio = cond == G_IO_HUP ? G_PRIORITY_DEFAULT_IDLE : G_PRIORITY_DEFAULT;
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watch->id = g_io_add_watch_full(io->channel, prio,
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cond | G_IO_ERR | G_IO_NVAL,
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watch_callback, watch,
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watch_destroy);
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if (watch->id == 0) {
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watch_destroy(watch);
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return NULL;
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}
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return watch;
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}
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static bool io_set_handler(struct io *io, GIOCondition cond,
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io_callback_func_t callback, void *user_data,
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io_destroy_func_t destroy)
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{
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struct io_watch **watch;
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if (!io)
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return false;
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switch (cond) {
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case G_IO_IN:
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watch = &io->read_watch;
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break;
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case G_IO_OUT:
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watch = &io->write_watch;
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break;
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case G_IO_HUP:
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watch = &io->disconnect_watch;
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break;
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case G_IO_PRI:
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case G_IO_ERR:
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case G_IO_NVAL:
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default:
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return false;
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}
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if (*watch) {
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g_source_remove((*watch)->id);
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*watch = NULL;
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}
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if (!callback)
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return true;
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*watch = watch_new(io, cond, callback, user_data, destroy);
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if (!*watch)
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return false;
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return true;
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}
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bool io_set_read_handler(struct io *io, io_callback_func_t callback,
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void *user_data, io_destroy_func_t destroy)
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{
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return io_set_handler(io, G_IO_IN, callback, user_data, destroy);
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}
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bool io_set_write_handler(struct io *io, io_callback_func_t callback,
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void *user_data, io_destroy_func_t destroy)
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{
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return io_set_handler(io, G_IO_OUT, callback, user_data, destroy);
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}
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bool io_set_disconnect_handler(struct io *io, io_callback_func_t callback,
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void *user_data, io_destroy_func_t destroy)
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{
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return io_set_handler(io, G_IO_HUP, callback, user_data, destroy);
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}
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ssize_t io_send(struct io *io, const struct iovec *iov, int iovcnt)
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{
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int fd;
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ssize_t ret;
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if (!io || !io->channel)
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return -ENOTCONN;
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fd = io_get_fd(io);
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do {
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ret = writev(fd, iov, iovcnt);
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} while (ret < 0 && errno == EINTR);
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if (ret < 0)
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return -errno;
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return ret;
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}
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bool io_shutdown(struct io *io)
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{
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if (!io || !io->channel)
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return false;
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return g_io_channel_shutdown(io->channel, TRUE, NULL)
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== G_IO_STATUS_NORMAL;
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}
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