io/channel-watch.c - third_party/qemu - Git at Google

 /*
  * QEMU I/O channels watch helper APIs
  *
  * Copyright (c) 2015 Red Hat, Inc.
  *
  * This library 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 of the License, or (at your option) any later version.
  *
  * This library 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 library; if not, see <http://www.gnu.org/licenses/>.
  *
  */

 #include "qemu/osdep.h"
 #include "io/channel-watch.h"

 typedef struct QIOChannelFDSource QIOChannelFDSource;
 struct QIOChannelFDSource {
     GSource parent;
     GPollFD fd;
     QIOChannel *ioc;
     GIOCondition condition;
 };


 #ifdef CONFIG_WIN32
 typedef struct QIOChannelSocketSource QIOChannelSocketSource;
 struct QIOChannelSocketSource {
     GSource parent;
     GPollFD fd;
     QIOChannel *ioc;
     SOCKET socket;
     int revents;
     GIOCondition condition;
 };

 #endif


 typedef struct QIOChannelFDPairSource QIOChannelFDPairSource;
 struct QIOChannelFDPairSource {
     GSource parent;
     GPollFD fdread;
     GPollFD fdwrite;
     QIOChannel *ioc;
     GIOCondition condition;
 };


 static gboolean
 qio_channel_fd_source_prepare(GSource *source G_GNUC_UNUSED,
                               gint *timeout)
 {
     *timeout = -1;

     return FALSE;
 }


 static gboolean
 qio_channel_fd_source_check(GSource *source)
 {
     QIOChannelFDSource *ssource = (QIOChannelFDSource *)source;

     return ssource->fd.revents & ssource->condition;
 }


 static gboolean
 qio_channel_fd_source_dispatch(GSource *source,
                                GSourceFunc callback,
                                gpointer user_data)
 {
     QIOChannelFunc func = (QIOChannelFunc)callback;
     QIOChannelFDSource *ssource = (QIOChannelFDSource *)source;

     return (*func)(ssource->ioc,
                    ssource->fd.revents & ssource->condition,
                    user_data);
 }


 static void
 qio_channel_fd_source_finalize(GSource *source)
 {
     QIOChannelFDSource *ssource = (QIOChannelFDSource *)source;

     object_unref(OBJECT(ssource->ioc));
 }


 #ifdef CONFIG_WIN32
 static gboolean
 qio_channel_socket_source_prepare(GSource *source G_GNUC_UNUSED,
                                   gint *timeout)
 {
     *timeout = -1;

     return FALSE;
 }


 /*
  * NB, this impl only works when the socket is in non-blocking
  * mode on Win32
  */
 static gboolean
 qio_channel_socket_source_check(GSource *source)
 {
     static struct timeval tv0;

     QIOChannelSocketSource *ssource = (QIOChannelSocketSource *)source;
     WSANETWORKEVENTS ev;
     fd_set rfds, wfds, xfds;

     if (!ssource->condition) {
         return 0;
     }

     WSAEnumNetworkEvents(ssource->socket, ssource->ioc->event, &ev);

     FD_ZERO(&rfds);
     FD_ZERO(&wfds);
     FD_ZERO(&xfds);
     if (ssource->condition & G_IO_IN) {
         FD_SET((SOCKET)ssource->socket, &rfds);
     }
     if (ssource->condition & G_IO_OUT) {
         FD_SET((SOCKET)ssource->socket, &wfds);
     }
     if (ssource->condition & G_IO_PRI) {
         FD_SET((SOCKET)ssource->socket, &xfds);
     }
     ssource->revents = 0;
     if (select(0, &rfds, &wfds, &xfds, &tv0) == 0) {
         return 0;
     }

     if (FD_ISSET(ssource->socket, &rfds)) {
         ssource->revents |= G_IO_IN;
     }
     if (FD_ISSET(ssource->socket, &wfds)) {
         ssource->revents |= G_IO_OUT;
     }
     if (FD_ISSET(ssource->socket, &xfds)) {
         ssource->revents |= G_IO_PRI;
     }

     return ssource->revents;
 }


 static gboolean
 qio_channel_socket_source_dispatch(GSource *source,
                                    GSourceFunc callback,
                                    gpointer user_data)
 {
     QIOChannelFunc func = (QIOChannelFunc)callback;
     QIOChannelSocketSource *ssource = (QIOChannelSocketSource *)source;

     return (*func)(ssource->ioc, ssource->revents, user_data);
 }


 static void
 qio_channel_socket_source_finalize(GSource *source)
 {
     QIOChannelSocketSource *ssource = (QIOChannelSocketSource *)source;

     object_unref(OBJECT(ssource->ioc));
 }


 GSourceFuncs qio_channel_socket_source_funcs = {
     qio_channel_socket_source_prepare,
     qio_channel_socket_source_check,
     qio_channel_socket_source_dispatch,
     qio_channel_socket_source_finalize
 };
 #endif


 static gboolean
 qio_channel_fd_pair_source_prepare(GSource *source G_GNUC_UNUSED,
                                    gint *timeout)
 {
     *timeout = -1;

     return FALSE;
 }


 static gboolean
 qio_channel_fd_pair_source_check(GSource *source)
 {
     QIOChannelFDPairSource *ssource = (QIOChannelFDPairSource *)source;
     GIOCondition poll_condition = ssource->fdread.revents |
         ssource->fdwrite.revents;

     return poll_condition & ssource->condition;
 }


 static gboolean
 qio_channel_fd_pair_source_dispatch(GSource *source,
                                     GSourceFunc callback,
                                     gpointer user_data)
 {
     QIOChannelFunc func = (QIOChannelFunc)callback;
     QIOChannelFDPairSource *ssource = (QIOChannelFDPairSource *)source;
     GIOCondition poll_condition = ssource->fdread.revents |
         ssource->fdwrite.revents;

     return (*func)(ssource->ioc,
                    poll_condition & ssource->condition,
                    user_data);
 }


 static void
 qio_channel_fd_pair_source_finalize(GSource *source)
 {
     QIOChannelFDPairSource *ssource = (QIOChannelFDPairSource *)source;

     object_unref(OBJECT(ssource->ioc));
 }


 GSourceFuncs qio_channel_fd_source_funcs = {
     qio_channel_fd_source_prepare,
     qio_channel_fd_source_check,
     qio_channel_fd_source_dispatch,
     qio_channel_fd_source_finalize
 };


 GSourceFuncs qio_channel_fd_pair_source_funcs = {
     qio_channel_fd_pair_source_prepare,
     qio_channel_fd_pair_source_check,
     qio_channel_fd_pair_source_dispatch,
     qio_channel_fd_pair_source_finalize
 };


 GSource *qio_channel_create_fd_watch(QIOChannel *ioc,
                                      int fd,
                                      GIOCondition condition)
 {
     GSource *source;
     QIOChannelFDSource *ssource;

     source = g_source_new(&qio_channel_fd_source_funcs,
                           sizeof(QIOChannelFDSource));
     ssource = (QIOChannelFDSource *)source;

     ssource->ioc = ioc;
     object_ref(OBJECT(ioc));

     ssource->condition = condition;

 #ifdef CONFIG_WIN32
     ssource->fd.fd = (gint64)_get_osfhandle(fd);
 #else
     ssource->fd.fd = fd;
 #endif
     ssource->fd.events = condition;

     g_source_add_poll(source, &ssource->fd);

     return source;
 }

 #ifdef CONFIG_WIN32
 GSource *qio_channel_create_socket_watch(QIOChannel *ioc,
                                          int socket,
                                          GIOCondition condition)
 {
     GSource *source;
     QIOChannelSocketSource *ssource;

 #ifdef WIN32
     WSAEventSelect(socket, ioc->event,
                    FD_READ | FD_ACCEPT | FD_CLOSE |
                    FD_CONNECT | FD_WRITE | FD_OOB);
 #endif

     source = g_source_new(&qio_channel_socket_source_funcs,
                           sizeof(QIOChannelSocketSource));
     ssource = (QIOChannelSocketSource *)source;

     ssource->ioc = ioc;
     object_ref(OBJECT(ioc));

     ssource->condition = condition;
     ssource->socket = socket;
     ssource->revents = 0;

     ssource->fd.fd = (gintptr)ioc->event;
     ssource->fd.events = G_IO_IN;

     g_source_add_poll(source, &ssource->fd);

     return source;
 }
 #else
 GSource *qio_channel_create_socket_watch(QIOChannel *ioc,
                                          int socket,
                                          GIOCondition condition)
 {
     return qio_channel_create_fd_watch(ioc, socket, condition);
 }
 #endif

 GSource *qio_channel_create_fd_pair_watch(QIOChannel *ioc,
                                           int fdread,
                                           int fdwrite,
                                           GIOCondition condition)
 {
     GSource *source;
     QIOChannelFDPairSource *ssource;

     source = g_source_new(&qio_channel_fd_pair_source_funcs,
                           sizeof(QIOChannelFDPairSource));
     ssource = (QIOChannelFDPairSource *)source;

     ssource->ioc = ioc;
     object_ref(OBJECT(ioc));

     ssource->condition = condition;

 #ifdef CONFIG_WIN32
     ssource->fdread.fd = (gint64)_get_osfhandle(fdread);
     ssource->fdwrite.fd = (gint64)_get_osfhandle(fdwrite);
 #else
     ssource->fdread.fd = fdread;
     ssource->fdwrite.fd = fdwrite;
 #endif

     ssource->fdread.events = condition & G_IO_IN;
     ssource->fdwrite.events = condition & G_IO_OUT;

     g_source_add_poll(source, &ssource->fdread);
     g_source_add_poll(source, &ssource->fdwrite);

     return source;
 }
	/*
	* QEMU I/O channels watch helper APIs
	*
	* Copyright (c) 2015 Red Hat, Inc.
	*
	* This library 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 of the License, or (at your option) any later version.
	*
	* This library 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 library; if not, see <http://www.gnu.org/licenses/>.
	*
	*/

	#include "qemu/osdep.h"
	#include "io/channel-watch.h"

	typedef struct QIOChannelFDSource QIOChannelFDSource;
	struct QIOChannelFDSource {
	GSource parent;
	GPollFD fd;
	QIOChannel *ioc;
	GIOCondition condition;
	};


	#ifdef CONFIG_WIN32
	typedef struct QIOChannelSocketSource QIOChannelSocketSource;
	struct QIOChannelSocketSource {
	GSource parent;
	GPollFD fd;
	QIOChannel *ioc;
	SOCKET socket;
	int revents;
	GIOCondition condition;
	};

	#endif


	typedef struct QIOChannelFDPairSource QIOChannelFDPairSource;
	struct QIOChannelFDPairSource {
	GSource parent;
	GPollFD fdread;
	GPollFD fdwrite;
	QIOChannel *ioc;
	GIOCondition condition;
	};


	static gboolean
	qio_channel_fd_source_prepare(GSource *source G_GNUC_UNUSED,
	gint *timeout)
	{
	*timeout = -1;

	return FALSE;
	}


	static gboolean
	qio_channel_fd_source_check(GSource *source)
	{
	QIOChannelFDSource ssource = (QIOChannelFDSource )source;

	return ssource->fd.revents & ssource->condition;
	}


	static gboolean
	qio_channel_fd_source_dispatch(GSource *source,
	GSourceFunc callback,
	gpointer user_data)
	{
	QIOChannelFunc func = (QIOChannelFunc)callback;
	QIOChannelFDSource ssource = (QIOChannelFDSource )source;

	return (*func)(ssource->ioc,
	ssource->fd.revents & ssource->condition,
	user_data);
	}


	static void
	qio_channel_fd_source_finalize(GSource *source)
	{
	QIOChannelFDSource ssource = (QIOChannelFDSource )source;

	object_unref(OBJECT(ssource->ioc));
	}


	#ifdef CONFIG_WIN32
	static gboolean
	qio_channel_socket_source_prepare(GSource *source G_GNUC_UNUSED,
	gint *timeout)
	{
	*timeout = -1;

	return FALSE;
	}


	/*
	* NB, this impl only works when the socket is in non-blocking
	* mode on Win32
	*/
	static gboolean
	qio_channel_socket_source_check(GSource *source)
	{
	static struct timeval tv0;

	QIOChannelSocketSource ssource = (QIOChannelSocketSource )source;
	WSANETWORKEVENTS ev;
	fd_set rfds, wfds, xfds;

	if (!ssource->condition) {
	return 0;
	}

	WSAEnumNetworkEvents(ssource->socket, ssource->ioc->event, &ev);

	FD_ZERO(&rfds);
	FD_ZERO(&wfds);
	FD_ZERO(&xfds);
	if (ssource->condition & G_IO_IN) {
	FD_SET((SOCKET)ssource->socket, &rfds);
	}
	if (ssource->condition & G_IO_OUT) {
	FD_SET((SOCKET)ssource->socket, &wfds);
	}
	if (ssource->condition & G_IO_PRI) {
	FD_SET((SOCKET)ssource->socket, &xfds);
	}
	ssource->revents = 0;
	if (select(0, &rfds, &wfds, &xfds, &tv0) == 0) {
	return 0;
	}

	if (FD_ISSET(ssource->socket, &rfds)) {
	ssource->revents \|= G_IO_IN;
	}
	if (FD_ISSET(ssource->socket, &wfds)) {
	ssource->revents \|= G_IO_OUT;
	}
	if (FD_ISSET(ssource->socket, &xfds)) {
	ssource->revents \|= G_IO_PRI;
	}

	return ssource->revents;
	}


	static gboolean
	qio_channel_socket_source_dispatch(GSource *source,
	GSourceFunc callback,
	gpointer user_data)
	{
	QIOChannelFunc func = (QIOChannelFunc)callback;
	QIOChannelSocketSource ssource = (QIOChannelSocketSource )source;

	return (*func)(ssource->ioc, ssource->revents, user_data);
	}


	static void
	qio_channel_socket_source_finalize(GSource *source)
	{
	QIOChannelSocketSource ssource = (QIOChannelSocketSource )source;

	object_unref(OBJECT(ssource->ioc));
	}


	GSourceFuncs qio_channel_socket_source_funcs = {
	qio_channel_socket_source_prepare,
	qio_channel_socket_source_check,
	qio_channel_socket_source_dispatch,
	qio_channel_socket_source_finalize
	};
	#endif


	static gboolean
	qio_channel_fd_pair_source_prepare(GSource *source G_GNUC_UNUSED,
	gint *timeout)
	{
	*timeout = -1;

	return FALSE;
	}


	static gboolean
	qio_channel_fd_pair_source_check(GSource *source)
	{
	QIOChannelFDPairSource ssource = (QIOChannelFDPairSource )source;
	GIOCondition poll_condition = ssource->fdread.revents \|
	ssource->fdwrite.revents;

	return poll_condition & ssource->condition;
	}


	static gboolean
	qio_channel_fd_pair_source_dispatch(GSource *source,
	GSourceFunc callback,
	gpointer user_data)
	{
	QIOChannelFunc func = (QIOChannelFunc)callback;
	QIOChannelFDPairSource ssource = (QIOChannelFDPairSource )source;
	GIOCondition poll_condition = ssource->fdread.revents \|
	ssource->fdwrite.revents;

	return (*func)(ssource->ioc,
	poll_condition & ssource->condition,
	user_data);
	}


	static void
	qio_channel_fd_pair_source_finalize(GSource *source)
	{
	QIOChannelFDPairSource ssource = (QIOChannelFDPairSource )source;

	object_unref(OBJECT(ssource->ioc));
	}


	GSourceFuncs qio_channel_fd_source_funcs = {
	qio_channel_fd_source_prepare,
	qio_channel_fd_source_check,
	qio_channel_fd_source_dispatch,
	qio_channel_fd_source_finalize
	};


	GSourceFuncs qio_channel_fd_pair_source_funcs = {
	qio_channel_fd_pair_source_prepare,
	qio_channel_fd_pair_source_check,
	qio_channel_fd_pair_source_dispatch,
	qio_channel_fd_pair_source_finalize
	};


	GSource qio_channel_create_fd_watch(QIOChannel ioc,
	int fd,
	GIOCondition condition)
	{
	GSource *source;
	QIOChannelFDSource *ssource;

	source = g_source_new(&qio_channel_fd_source_funcs,
	sizeof(QIOChannelFDSource));
	ssource = (QIOChannelFDSource *)source;

	ssource->ioc = ioc;
	object_ref(OBJECT(ioc));

	ssource->condition = condition;

	#ifdef CONFIG_WIN32
	ssource->fd.fd = (gint64)_get_osfhandle(fd);
	#else
	ssource->fd.fd = fd;
	#endif
	ssource->fd.events = condition;

	g_source_add_poll(source, &ssource->fd);

	return source;
	}

	#ifdef CONFIG_WIN32
	GSource qio_channel_create_socket_watch(QIOChannel ioc,
	int socket,
	GIOCondition condition)
	{
	GSource *source;
	QIOChannelSocketSource *ssource;

	#ifdef WIN32
	WSAEventSelect(socket, ioc->event,
	FD_READ \| FD_ACCEPT \| FD_CLOSE \|
	FD_CONNECT \| FD_WRITE \| FD_OOB);
	#endif

	source = g_source_new(&qio_channel_socket_source_funcs,
	sizeof(QIOChannelSocketSource));
	ssource = (QIOChannelSocketSource *)source;

	ssource->ioc = ioc;
	object_ref(OBJECT(ioc));

	ssource->condition = condition;
	ssource->socket = socket;
	ssource->revents = 0;

	ssource->fd.fd = (gintptr)ioc->event;
	ssource->fd.events = G_IO_IN;

	g_source_add_poll(source, &ssource->fd);

	return source;
	}
	#else
	GSource qio_channel_create_socket_watch(QIOChannel ioc,
	int socket,
	GIOCondition condition)
	{
	return qio_channel_create_fd_watch(ioc, socket, condition);
	}
	#endif

	GSource qio_channel_create_fd_pair_watch(QIOChannel ioc,
	int fdread,
	int fdwrite,
	GIOCondition condition)
	{
	GSource *source;
	QIOChannelFDPairSource *ssource;

	source = g_source_new(&qio_channel_fd_pair_source_funcs,
	sizeof(QIOChannelFDPairSource));
	ssource = (QIOChannelFDPairSource *)source;

	ssource->ioc = ioc;
	object_ref(OBJECT(ioc));

	ssource->condition = condition;

	#ifdef CONFIG_WIN32
	ssource->fdread.fd = (gint64)_get_osfhandle(fdread);
	ssource->fdwrite.fd = (gint64)_get_osfhandle(fdwrite);
	#else
	ssource->fdread.fd = fdread;
	ssource->fdwrite.fd = fdwrite;
	#endif

	ssource->fdread.events = condition & G_IO_IN;
	ssource->fdwrite.events = condition & G_IO_OUT;

	g_source_add_poll(source, &ssource->fdread);
	g_source_add_poll(source, &ssource->fdwrite);

	return source;
	}