uhub/src/network/notify.c

102 lines
2.6 KiB
C

/*
* uhub - A tiny ADC p2p connection hub
* Copyright (C) 2007-2014, Jan Vidar Krey
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "uhub.h"
struct uhub_notify_handle
{
net_notify_callback callback;
void* ptr;
#ifndef WIN32
int pipe_fd[2];
struct net_connection* con;
#endif
};
/*
* This contains a mechanism to wake up the main thread
* in a thread safe manner while it would be blocking
* in select() or something equivalent typically invoked from
* net_backend_process().
*
* The main usage is for the DNS resolver to notify the
* main thread that there are DNS results to be
* processed.
*/
/**
* Create a notification handle.
*/
#ifndef WIN32
static void notify_callback(struct net_connection* con, int event, void* ptr)
{
LOG_TRACE("notify_callback()");
struct uhub_notify_handle* handle = (struct uhub_notify_handle*) ptr;
char buf;
int ret = read(handle->pipe_fd[0], &buf, 1);
if (ret == 1)
{
if (handle->callback)
handle->callback(handle, handle->ptr);
}
}
#endif
struct uhub_notify_handle* net_notify_create(net_notify_callback cb, void* ptr)
{
LOG_TRACE("net_notify_create()");
struct uhub_notify_handle* handle = (struct uhub_notify_handle*) hub_malloc(sizeof(struct uhub_notify_handle));
handle->callback = cb;
handle->ptr = ptr;
#ifndef WIN32
int ret = pipe(handle->pipe_fd);
if (ret == -1)
{
LOG_ERROR("Unable to setup notification pipes.");
hub_free(handle);
return 0;
}
handle->con = net_con_create();
net_con_initialize(handle->con, handle->pipe_fd[0], notify_callback, handle, NET_EVENT_READ);
#endif
return handle;
}
void net_notify_destroy(struct uhub_notify_handle* handle)
{
LOG_TRACE("net_notify_destroy()");
#ifndef WIN32
net_con_destroy(handle->con);
close(handle->pipe_fd[0]);
close(handle->pipe_fd[1]);
handle->pipe_fd[0] = -1;
handle->pipe_fd[0] = -1;
#endif
hub_free(handle);
}
void net_notify_signal(struct uhub_notify_handle* handle, char data)
{
LOG_TRACE("net_notify_signal()");
#ifndef WIN32
write(handle->pipe_fd[1], &data, 1);
#endif
}