xkeyboard-config fontconfig libX11 libXft libxcb mesa git update 12 Mar 2012

1 files changed, 759 insertions, 759 deletions

diff --git a/libX11/src/xcb_io.c b/libX11/src/xcb_io.c
index bac9bdf0b..300ef571f 100644
--- a/libX11/src/xcb_io.c
+++ b/libX11/src/xcb_io.c
@@ -1,759 +1,759 @@
-/* Copyright (C) 2003-2006 Jamey Sharp, Josh Triplett

- * This file is licensed under the MIT license. See the file COPYING. */

-

-#ifdef HAVE_CONFIG_H

-#include <config.h>

-#endif

-

-#include "Xlibint.h"

-#include "locking.h"

-#include "Xprivate.h"

-#include "Xxcbint.h"

-#include <xcb/xcbext.h>

-

-#include <assert.h>

-#ifdef HAVE_INTTYPES_H

-#include <inttypes.h>

-#endif

-#include <stdio.h>

-#include <stdint.h>

-#include <stdlib.h>

-#include <string.h>

-#ifdef HAVE_SYS_SELECT_H

-#include <sys/select.h>

-#endif

-

-#define xcb_fail_assert(_message, _var) { \

-	unsigned int _var = 1; \

-	fprintf(stderr, "[xcb] Aborting, sorry about that.\n"); \

-	assert(!_var); \

-}

-

-#define throw_thread_fail_assert(_message, _var) { \

-	fprintf(stderr, "[xcb] " _message "\n"); \

-	fprintf(stderr, "[xcb] Most likely this is a multi-threaded client " \

-	                "and XInitThreads has not been called\n"); \

-	xcb_fail_assert(_message, _var); \

-}

-

-/* XXX: It would probably be most useful if we stored the last-processed

- *      request, so we could find the offender from the message. */

-#define throw_extlib_fail_assert(_message, _var) { \

-	fprintf(stderr, "[xcb] " _message "\n"); \

-	fprintf(stderr, "[xcb] This is most likely caused by a broken X " \

-	                "extension library\n"); \

-	xcb_fail_assert(_message, _var); \

-}

-

-static void return_socket(void *closure)

-{

-	Display *dpy = closure;

-	InternalLockDisplay(dpy, /* don't skip user locks */ 0);

-	_XSend(dpy, NULL, 0);

-	dpy->bufmax = dpy->buffer;

-	UnlockDisplay(dpy);

-}

-

-static void require_socket(Display *dpy)

-{

-	if(dpy->bufmax == dpy->buffer)

-	{

-		uint64_t sent;

-		int flags = 0;

-		/* if we don't own the event queue, we have to ask XCB

-		 * to set our errors aside for us. */

-		if(dpy->xcb->event_owner != XlibOwnsEventQueue)

-			flags = XCB_REQUEST_CHECKED;

-		if(!xcb_take_socket(dpy->xcb->connection, return_socket, dpy,

-		                    flags, &sent))

-			_XIOError(dpy);

-		/* Xlib uses unsigned long for sequence numbers.  XCB

-		 * uses 64-bit internally, but currently exposes an

-		 * unsigned int API.  If these differ, Xlib cannot track

-		 * the full 64-bit sequence number if 32-bit wrap

-		 * happens while Xlib does not own the socket.  A

-		 * complete fix would be to make XCB's public API use

-		 * 64-bit sequence numbers. */

-		if (sizeof(unsigned long) > sizeof(unsigned int) &&

-		    dpy->xcb->event_owner == XlibOwnsEventQueue &&

-		    (sent - dpy->last_request_read >= (UINT64_C(1) << 32))) {

-			throw_thread_fail_assert("Sequence number wrapped "

-			                         "beyond 32 bits while Xlib "

-						 "did not own the socket",

-			                         xcb_xlib_seq_number_wrapped);

-		}

-		dpy->xcb->last_flushed = dpy->request = sent;

-		dpy->bufmax = dpy->xcb->real_bufmax;

-	}

-}

-

-/* Call internal connection callbacks for any fds that are currently

- * ready to read. This function will not block unless one of the

- * callbacks blocks.

- *

- * This code borrowed from _XWaitForReadable. Inverse call tree:

- * _XRead

- *  _XWaitForWritable

- *   _XFlush

- *   _XSend

- *  _XEventsQueued

- *  _XReadEvents

- *  _XRead[0-9]+

- *   _XAllocIDs

- *  _XReply

- *  _XEatData

- * _XReadPad

- */

-static void check_internal_connections(Display *dpy)

-{

-	struct _XConnectionInfo *ilist;

-	fd_set r_mask;

-	struct timeval tv;

-	int result;

-	int highest_fd = -1;

-

-	if(dpy->flags & XlibDisplayProcConni || !dpy->im_fd_info)

-		return;

-

-	FD_ZERO(&r_mask);

-	for(ilist = dpy->im_fd_info; ilist; ilist = ilist->next)

-	{

-		assert(ilist->fd >= 0);

-		FD_SET(ilist->fd, &r_mask);

-		if(ilist->fd > highest_fd)

-			highest_fd = ilist->fd;

-	}

-	assert(highest_fd >= 0);

-

-	tv.tv_sec = 0;

-	tv.tv_usec = 0;

-	result = select(highest_fd + 1, &r_mask, NULL, NULL, &tv);

-

-	if(result == -1)

-	{

-		if(errno == EINTR)

-			return;

-		_XIOError(dpy);

-	}

-

-	for(ilist = dpy->im_fd_info; result && ilist; ilist = ilist->next)

-		if(FD_ISSET(ilist->fd, &r_mask))

-		{

-			_XProcessInternalConnection(dpy, ilist);

-			--result;

-		}

-}

-

-static PendingRequest *append_pending_request(Display *dpy, unsigned long sequence)

-{

-	PendingRequest *node = malloc(sizeof(PendingRequest));

-	assert(node);

-	node->next = NULL;

-	node->sequence = sequence;

-	node->reply_waiter = 0;

-	if(dpy->xcb->pending_requests_tail)

-	{

-		if (XLIB_SEQUENCE_COMPARE(dpy->xcb->pending_requests_tail->sequence,

-		                          >=, node->sequence))

-			throw_thread_fail_assert("Unknown sequence number "

-			                         "while appending request",

-			                         xcb_xlib_unknown_seq_number);

-		if (dpy->xcb->pending_requests_tail->next != NULL)

-			throw_thread_fail_assert("Unknown request in queue "

-			                         "while appending request",

-			                         xcb_xlib_unknown_req_pending);

-		dpy->xcb->pending_requests_tail->next = node;

-	}

-	else

-		dpy->xcb->pending_requests = node;

-	dpy->xcb->pending_requests_tail = node;

-	return node;

-}

-

-static void dequeue_pending_request(Display *dpy, PendingRequest *req)

-{

-	if (req != dpy->xcb->pending_requests)

-		throw_thread_fail_assert("Unknown request in queue while "

-		                         "dequeuing",

-		                         xcb_xlib_unknown_req_in_deq);

-

-	dpy->xcb->pending_requests = req->next;

-	if(!dpy->xcb->pending_requests)

-	{

-		if (req != dpy->xcb->pending_requests_tail)

-			throw_thread_fail_assert("Unknown request in queue "

-			                         "while dequeuing",

-			                         xcb_xlib_unknown_req_in_deq);

-		dpy->xcb->pending_requests_tail = NULL;

-	}

-	else if (XLIB_SEQUENCE_COMPARE(req->sequence, >=,

-	                               dpy->xcb->pending_requests->sequence))

-		throw_thread_fail_assert("Unknown sequence number while "

-		                         "dequeuing request",

-		                         xcb_xlib_threads_sequence_lost);

-

-	free(req);

-}

-

-static int handle_error(Display *dpy, xError *err, Bool in_XReply)

-{

-	_XExtension *ext;

-	int ret_code;

-	/* Oddly, Xlib only allows extensions to suppress errors when

-	 * those errors were seen by _XReply. */

-	if(in_XReply)

-		/*

-		 * we better see if there is an extension who may

-		 * want to suppress the error.

-		 */

-		for(ext = dpy->ext_procs; ext; ext = ext->next)

-			if(ext->error && (*ext->error)(dpy, err, &ext->codes, &ret_code))

-				return ret_code;

-	_XError(dpy, err);

-	return 0;

-}

-

-/* Widen a 32-bit sequence number into a native-word-size (unsigned long)

- * sequence number.  Treating the comparison as a 1 and shifting it avoids a

- * conditional branch, and shifting by 16 twice avoids a compiler warning when

- * sizeof(unsigned long) == 4. */

-static void widen(unsigned long *wide, unsigned int narrow)

-{

-	unsigned long new = (*wide & ~0xFFFFFFFFUL) | narrow;

-	*wide = new + ((unsigned long) (new < *wide) << 16 << 16);

-}

-

-/* Thread-safety rules:

- *

- * At most one thread can be reading from XCB's event queue at a time.

- * If you are not the current event-reading thread and you need to find

- * out if an event is available, you must wait.

- *

- * The same rule applies for reading replies.

- *

- * A single thread cannot be both the the event-reading and the

- * reply-reading thread at the same time.

- *

- * We always look at both the current event and the first pending reply

- * to decide which to process next.

- *

- * We always process all responses in sequence-number order, which may

- * mean waiting for another thread (either the event_waiter or the

- * reply_waiter) to handle an earlier response before we can process or

- * return a later one. If so, we wait on the corresponding condition

- * variable for that thread to process the response and wake us up.

- */

-

-static xcb_generic_reply_t *poll_for_event(Display *dpy)

-{

-	/* Make sure the Display's sequence numbers are valid */

-	require_socket(dpy);

-

-	/* Precondition: This thread can safely get events from XCB. */

-	assert(dpy->xcb->event_owner == XlibOwnsEventQueue && !dpy->xcb->event_waiter);

-

-	if(!dpy->xcb->next_event)

-		dpy->xcb->next_event = xcb_poll_for_event(dpy->xcb->connection);

-

-	if(dpy->xcb->next_event)

-	{

-		PendingRequest *req = dpy->xcb->pending_requests;

-		xcb_generic_event_t *event = dpy->xcb->next_event;

-		unsigned long event_sequence = dpy->last_request_read;

-		widen(&event_sequence, event->full_sequence);

-		if(!req || XLIB_SEQUENCE_COMPARE(event_sequence, <, req->sequence)

-		        || (event->response_type != X_Error && event_sequence == req->sequence))

-		{

-			if (XLIB_SEQUENCE_COMPARE(event_sequence, >,

-			                          dpy->request))

-			{

-				throw_thread_fail_assert("Unknown sequence "

-				                         "number while "

-							 "processing queue",

-				                xcb_xlib_threads_sequence_lost);

-			}

-			dpy->last_request_read = event_sequence;

-			dpy->xcb->next_event = NULL;

-			return (xcb_generic_reply_t *) event;

-		}

-	}

-	return NULL;

-}

-

-static xcb_generic_reply_t *poll_for_response(Display *dpy)

-{

-	void *response;

-	xcb_generic_error_t *error;

-	PendingRequest *req;

-	while(!(response = poll_for_event(dpy)) &&

-	      (req = dpy->xcb->pending_requests) &&

-	      !req->reply_waiter &&

-	      xcb_poll_for_reply(dpy->xcb->connection, req->sequence, &response, &error))

-	{

-		if(XLIB_SEQUENCE_COMPARE(req->sequence, >, dpy->request))

-		{

-			throw_thread_fail_assert("Unknown sequence number "

-			                         "while awaiting reply",

-			                        xcb_xlib_threads_sequence_lost);

-		}

-		dpy->last_request_read = req->sequence;

-		if(response)

-			break;

-		dequeue_pending_request(dpy, req);

-		if(error)

-			return (xcb_generic_reply_t *) error;

-	}

-	return response;

-}

-

-static void handle_response(Display *dpy, xcb_generic_reply_t *response, Bool in_XReply)

-{

-	_XAsyncHandler *async, *next;

-	switch(response->response_type)

-	{

-	case X_Reply:

-		for(async = dpy->async_handlers; async; async = next)

-		{

-			next = async->next;

-			if(async->handler(dpy, (xReply *) response, (char *) response, sizeof(xReply) + (response->length << 2), async->data))

-				break;

-		}

-		break;

-

-	case X_Error:

-		handle_error(dpy, (xError *) response, in_XReply);

-		break;

-

-	default: /* event */

-		/* GenericEvents may be > 32 bytes. In this case, the

-		 * event struct is trailed by the additional bytes. the

-		 * xcb_generic_event_t struct uses 4 bytes for internal

-		 * numbering, so we need to shift the trailing data to

-		 * be after the first 32 bytes. */

-		if(response->response_type == GenericEvent && ((xcb_ge_event_t *) response)->length)

-		{

-			xcb_ge_event_t *event = (xcb_ge_event_t *) response;

-			memmove(&event->full_sequence, &event[1], event->length * 4);

-		}

-		_XEnq(dpy, (xEvent *) response);

-		break;

-	}

-	free(response);

-}

-

-int _XEventsQueued(Display *dpy, int mode)

-{

-	xcb_generic_reply_t *response;

-	if(dpy->flags & XlibDisplayIOError)

-		return 0;

-	if(dpy->xcb->event_owner != XlibOwnsEventQueue)

-		return 0;

-

-	if(mode == QueuedAfterFlush)

-		_XSend(dpy, NULL, 0);

-	else

-		check_internal_connections(dpy);

-

-	/* If another thread is blocked waiting for events, then we must

-	 * let that thread pick up the next event. Since it blocked, we

-	 * can reasonably claim there are no new events right now. */

-	if(!dpy->xcb->event_waiter)

-	{

-		while((response = poll_for_response(dpy)))

-			handle_response(dpy, response, False);

-		if(xcb_connection_has_error(dpy->xcb->connection))

-			_XIOError(dpy);

-	}

-	return dpy->qlen;

-}

-

-/* _XReadEvents - Flush the output queue,

- * then read as many events as possible (but at least 1) and enqueue them

- */

-void _XReadEvents(Display *dpy)

-{

-	xcb_generic_reply_t *response;

-	unsigned long serial;

-

-	if(dpy->flags & XlibDisplayIOError)

-		return;

-	_XSend(dpy, NULL, 0);

-	if(dpy->xcb->event_owner != XlibOwnsEventQueue)

-		return;

-	check_internal_connections(dpy);

-

-	serial = dpy->next_event_serial_num;

-	while(serial == dpy->next_event_serial_num || dpy->qlen == 0)

-	{

-		if(dpy->xcb->event_waiter)

-		{

-			ConditionWait(dpy, dpy->xcb->event_notify);

-			/* Maybe the other thread got us an event. */

-			continue;

-		}

-

-		if(!dpy->xcb->next_event)

-		{

-			xcb_generic_event_t *event;

-			dpy->xcb->event_waiter = 1;

-			UnlockDisplay(dpy);

-			event = xcb_wait_for_event(dpy->xcb->connection);

-			/* It appears that classic Xlib respected user

-			 * locks when waking up after waiting for

-			 * events. However, if this thread did not have

-			 * any user locks, and another thread takes a

-			 * user lock and tries to read events, then we'd

-			 * deadlock. So we'll choose to let the thread

-			 * that got in first consume events, despite the

-			 * later thread's user locks. */

-			InternalLockDisplay(dpy, /* ignore user locks */ 1);

-			dpy->xcb->event_waiter = 0;

-			ConditionBroadcast(dpy, dpy->xcb->event_notify);

-			if(!event)

-				_XIOError(dpy);

-			dpy->xcb->next_event = event;

-		}

-

-		/* We've established most of the conditions for

-		 * poll_for_response to return non-NULL. The exceptions

-		 * are connection shutdown, and finding that another

-		 * thread is waiting for the next reply we'd like to

-		 * process. */

-

-		response = poll_for_response(dpy);

-		if(response)

-			handle_response(dpy, response, False);

-		else if(dpy->xcb->pending_requests->reply_waiter)

-		{ /* need braces around ConditionWait */

-			ConditionWait(dpy, dpy->xcb->reply_notify);

-		}

-		else

-			_XIOError(dpy);

-	}

-

-	/* The preceding loop established that there is no

-	 * event_waiter--unless we just called ConditionWait because of

-	 * a reply_waiter, in which case another thread may have become

-	 * the event_waiter while we slept unlocked. */

-	if(!dpy->xcb->event_waiter)

-		while((response = poll_for_response(dpy)))

-			handle_response(dpy, response, False);

-	if(xcb_connection_has_error(dpy->xcb->connection))

-		_XIOError(dpy);

-}

-

-/*

- * _XSend - Flush the buffer and send the client data. 32 bit word aligned

- * transmission is used, if size is not 0 mod 4, extra bytes are transmitted.

- *

- * Note that the connection must not be read from once the data currently

- * in the buffer has been written.

- */

-void _XSend(Display *dpy, const char *data, long size)

-{

-	static const xReq dummy_request;

-	static char const pad[3];

-	struct iovec vec[3];

-	uint64_t requests;

-	_XExtension *ext;

-	xcb_connection_t *c = dpy->xcb->connection;

-	if(dpy->flags & XlibDisplayIOError)

-		return;

-

-	if(dpy->bufptr == dpy->buffer && !size)

-		return;

-

-	/* iff we asked XCB to set aside errors, we must pick those up

-	 * eventually. iff there are async handlers, we may have just

-	 * issued requests that will generate replies. in either case,

-	 * we need to remember to check later. */

-	if(dpy->xcb->event_owner != XlibOwnsEventQueue || dpy->async_handlers)

-	{

-		uint64_t sequence;

-		for(sequence = dpy->xcb->last_flushed + 1; sequence <= dpy->request; ++sequence)

-			append_pending_request(dpy, sequence);

-	}

-	requests = dpy->request - dpy->xcb->last_flushed;

-	dpy->xcb->last_flushed = dpy->request;

-

-	vec[0].iov_base = dpy->buffer;

-	vec[0].iov_len = dpy->bufptr - dpy->buffer;

-	vec[1].iov_base = (caddr_t) data;

-	vec[1].iov_len = size;

-	vec[2].iov_base = (caddr_t) pad;

-	vec[2].iov_len = -size & 3;

-

-	for(ext = dpy->flushes; ext; ext = ext->next_flush)

-	{

-		int i;

-		for(i = 0; i < 3; ++i)

-			if(vec[i].iov_len)

-				ext->before_flush(dpy, &ext->codes, vec[i].iov_base, vec[i].iov_len);

-	}

-

-	if(xcb_writev(c, vec, 3, requests) < 0)

-		_XIOError(dpy);

-	dpy->bufptr = dpy->buffer;

-	dpy->last_req = (char *) &dummy_request;

-

-	check_internal_connections(dpy);

-

-	_XSetSeqSyncFunction(dpy);

-}

-

-/*

- * _XFlush - Flush the X request buffer.  If the buffer is empty, no

- * action is taken.

- */

-void _XFlush(Display *dpy)

-{

-	require_socket(dpy);

-	_XSend(dpy, NULL, 0);

-

-	_XEventsQueued(dpy, QueuedAfterReading);

-}

-

-static const XID inval_id = ~0UL;

-

-void _XIDHandler(Display *dpy)

-{

-	if (dpy->xcb->next_xid == inval_id)

-		_XAllocIDs(dpy, &dpy->xcb->next_xid, 1);

-}

-

-/* _XAllocID - resource ID allocation routine. */

-XID _XAllocID(Display *dpy)

-{

-	XID ret = dpy->xcb->next_xid;

-	assert (ret != inval_id);

-	dpy->xcb->next_xid = inval_id;

-	_XSetPrivSyncFunction(dpy);

-	return ret;

-}

-

-/* _XAllocIDs - multiple resource ID allocation routine. */

-void _XAllocIDs(Display *dpy, XID *ids, int count)

-{

-	int i;

-#ifdef XTHREADS

-	if (dpy->lock)

-		(*dpy->lock->user_lock_display)(dpy);

-	UnlockDisplay(dpy);

-#endif

-	for (i = 0; i < count; i++)

-		ids[i] = xcb_generate_id(dpy->xcb->connection);

-#ifdef XTHREADS

-	InternalLockDisplay(dpy, /* don't skip user locks */ 0);

-	if (dpy->lock)

-		(*dpy->lock->user_unlock_display)(dpy);

-#endif

-}

-

-static void _XFreeReplyData(Display *dpy, Bool force)

-{

-	if(!force && dpy->xcb->reply_consumed < dpy->xcb->reply_length)

-		return;

-	free(dpy->xcb->reply_data);

-	dpy->xcb->reply_data = NULL;

-}

-

-/*

- * _XReply - Wait for a reply packet and copy its contents into the

- * specified rep.

- * extra: number of 32-bit words expected after the reply

- * discard: should I discard data following "extra" words?

- */

-Status _XReply(Display *dpy, xReply *rep, int extra, Bool discard)

-{

-	xcb_generic_error_t *error;

-	xcb_connection_t *c = dpy->xcb->connection;

-	char *reply;

-	PendingRequest *current;

-

-	if (dpy->xcb->reply_data)

-		throw_extlib_fail_assert("Extra reply data still left in queue",

-		                         xcb_xlib_extra_reply_data_left);

-

-	if(dpy->flags & XlibDisplayIOError)

-		return 0;

-

-	_XSend(dpy, NULL, 0);

-	if(dpy->xcb->pending_requests_tail && dpy->xcb->pending_requests_tail->sequence == dpy->request)

-		current = dpy->xcb->pending_requests_tail;

-	else

-		current = append_pending_request(dpy, dpy->request);

-	/* Don't let any other thread get this reply. */

-	current->reply_waiter = 1;

-

-	while(1)

-	{

-		PendingRequest *req = dpy->xcb->pending_requests;

-		xcb_generic_reply_t *response;

-

-		if(req != current && req->reply_waiter)

-		{

-			ConditionWait(dpy, dpy->xcb->reply_notify);

-			/* Another thread got this reply. */

-			continue;

-		}

-		req->reply_waiter = 1;

-		UnlockDisplay(dpy);

-		response = xcb_wait_for_reply(c, req->sequence, &error);

-		/* Any user locks on another thread must have been taken

-		 * while we slept in xcb_wait_for_reply. Classic Xlib

-		 * ignored those user locks in this case, so we do too. */

-		InternalLockDisplay(dpy, /* ignore user locks */ 1);

-

-		/* We have the response we're looking for. Now, before

-		 * letting anyone else process this sequence number, we

-		 * need to process any events that should have come

-		 * earlier. */

-

-		if(dpy->xcb->event_owner == XlibOwnsEventQueue)

-		{

-			xcb_generic_reply_t *event;

-			/* If some thread is already waiting for events,

-			 * it will get the first one. That thread must

-			 * process that event before we can continue. */

-			/* FIXME: That event might be after this reply,

-			 * and might never even come--or there might be

-			 * multiple threads trying to get events. */

-			while(dpy->xcb->event_waiter)

-			{ /* need braces around ConditionWait */

-				ConditionWait(dpy, dpy->xcb->event_notify);

-			}

-			while((event = poll_for_event(dpy)))

-				handle_response(dpy, event, True);

-		}

-

-		req->reply_waiter = 0;

-		ConditionBroadcast(dpy, dpy->xcb->reply_notify);

-		if(XLIB_SEQUENCE_COMPARE(req->sequence, >, dpy->request)) {

-			throw_thread_fail_assert("Unknown sequence number "

-			                         "while processing reply",

-			                        xcb_xlib_threads_sequence_lost);

-		}

-		dpy->last_request_read = req->sequence;

-		if(!response)

-			dequeue_pending_request(dpy, req);

-

-		if(req == current)

-		{

-			reply = (char *) response;

-			break;

-		}

-

-		if(error)

-			handle_response(dpy, (xcb_generic_reply_t *) error, True);

-		else if(response)

-			handle_response(dpy, response, True);

-	}

-	check_internal_connections(dpy);

-

-	if(dpy->xcb->next_event && dpy->xcb->next_event->response_type == X_Error)

-	{

-		xcb_generic_event_t *event = dpy->xcb->next_event;

-		unsigned long event_sequence = dpy->last_request_read;

-		widen(&event_sequence, event->full_sequence);

-		if(event_sequence == dpy->last_request_read)

-		{

-			error = (xcb_generic_error_t *) event;

-			dpy->xcb->next_event = NULL;

-		}

-	}

-

-	if(error)

-	{

-		int ret_code;

-

-		/* Xlib is evil and assumes that even errors will be

-		 * copied into rep. */

-		memcpy(rep, error, 32);

-

-		/* do not die on "no such font", "can't allocate",

-		   "can't grab" failures */

-		switch(error->error_code)

-		{

-			case BadName:

-				switch(error->major_code)

-				{

-					case X_LookupColor:

-					case X_AllocNamedColor:

-						free(error);

-						return 0;

-				}

-				break;

-			case BadFont:

-				if(error->major_code == X_QueryFont) {

-					free(error);

-					return 0;

-				}

-				break;

-			case BadAlloc:

-			case BadAccess:

-				free(error);

-				return 0;

-		}

-

-		ret_code = handle_error(dpy, (xError *) error, True);

-		free(error);

-		return ret_code;

-	}

-

-	/* it's not an error, but we don't have a reply, so it's an I/O

-	 * error. */

-	if(!reply)

-	{

-		_XIOError(dpy);

-		return 0;

-	}

-

-	/* there's no error and we have a reply. */

-	dpy->xcb->reply_data = reply;

-	dpy->xcb->reply_consumed = sizeof(xReply) + (extra * 4);

-	dpy->xcb->reply_length = sizeof(xReply);

-	if(dpy->xcb->reply_data[0] == 1)

-		dpy->xcb->reply_length += (((xcb_generic_reply_t *) dpy->xcb->reply_data)->length * 4);

-

-	/* error: Xlib asks too much. give them what we can anyway. */

-	if(dpy->xcb->reply_length < dpy->xcb->reply_consumed)

-		dpy->xcb->reply_consumed = dpy->xcb->reply_length;

-

-	memcpy(rep, dpy->xcb->reply_data, dpy->xcb->reply_consumed);

-	_XFreeReplyData(dpy, discard);

-	return 1;

-}

-

-int _XRead(Display *dpy, char *data, long size)

-{

-	assert(size >= 0);

-	if(size == 0)

-		return 0;

-	if(dpy->xcb->reply_data == NULL ||

-	   dpy->xcb->reply_consumed + size > dpy->xcb->reply_length)

-		throw_extlib_fail_assert("Too much data requested from _XRead",

-		                         xcb_xlib_too_much_data_requested);

-	memcpy(data, dpy->xcb->reply_data + dpy->xcb->reply_consumed, size);

-	dpy->xcb->reply_consumed += size;

-	_XFreeReplyData(dpy, False);

-	return 0;

-}

-

-/*

- * _XReadPad - Read bytes from the socket taking into account incomplete

- * reads.  If the number of bytes is not 0 mod 4, read additional pad

- * bytes.

- */

-void _XReadPad(Display *dpy, char *data, long size)

-{

-	_XRead(dpy, data, size);

-	dpy->xcb->reply_consumed += -size & 3;

-	_XFreeReplyData(dpy, False);

-}

-

-/* Read and discard "n" 8-bit bytes of data */

-void _XEatData(Display *dpy, unsigned long n)

-{

-	dpy->xcb->reply_consumed += n;

-	_XFreeReplyData(dpy, False);

-}

+/* Copyright (C) 2003-2006 Jamey Sharp, Josh Triplett
+ * This file is licensed under the MIT license. See the file COPYING. */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "Xlibint.h"
+#include "locking.h"
+#include "Xprivate.h"
+#include "Xxcbint.h"
+#include <xcb/xcbext.h>
+
+#include <assert.h>
+#ifdef HAVE_INTTYPES_H
+#include <inttypes.h>
+#endif
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+
+#define xcb_fail_assert(_message, _var) { \
+	unsigned int _var = 1; \
+	fprintf(stderr, "[xcb] Aborting, sorry about that.\n"); \
+	assert(!_var); \
+}
+
+#define throw_thread_fail_assert(_message, _var) { \
+	fprintf(stderr, "[xcb] " _message "\n"); \
+	fprintf(stderr, "[xcb] Most likely this is a multi-threaded client " \
+	                "and XInitThreads has not been called\n"); \
+	xcb_fail_assert(_message, _var); \
+}
+
+/* XXX: It would probably be most useful if we stored the last-processed
+ *      request, so we could find the offender from the message. */
+#define throw_extlib_fail_assert(_message, _var) { \
+	fprintf(stderr, "[xcb] " _message "\n"); \
+	fprintf(stderr, "[xcb] This is most likely caused by a broken X " \
+	                "extension library\n"); \
+	xcb_fail_assert(_message, _var); \
+}
+
+static void return_socket(void *closure)
+{
+	Display *dpy = closure;
+	InternalLockDisplay(dpy, /* don't skip user locks */ 0);
+	_XSend(dpy, NULL, 0);
+	dpy->bufmax = dpy->buffer;
+	UnlockDisplay(dpy);
+}
+
+static void require_socket(Display *dpy)
+{
+	if(dpy->bufmax == dpy->buffer)
+	{
+		uint64_t sent;
+		int flags = 0;
+		/* if we don't own the event queue, we have to ask XCB
+		 * to set our errors aside for us. */
+		if(dpy->xcb->event_owner != XlibOwnsEventQueue)
+			flags = XCB_REQUEST_CHECKED;
+		if(!xcb_take_socket(dpy->xcb->connection, return_socket, dpy,
+		                    flags, &sent))
+			_XIOError(dpy);
+		/* Xlib uses unsigned long for sequence numbers.  XCB
+		 * uses 64-bit internally, but currently exposes an
+		 * unsigned int API.  If these differ, Xlib cannot track
+		 * the full 64-bit sequence number if 32-bit wrap
+		 * happens while Xlib does not own the socket.  A
+		 * complete fix would be to make XCB's public API use
+		 * 64-bit sequence numbers. */
+		if (sizeof(unsigned long) > sizeof(unsigned int) &&
+		    dpy->xcb->event_owner == XlibOwnsEventQueue &&
+		    (sent - dpy->last_request_read >= (UINT64_C(1) << 32))) {
+			throw_thread_fail_assert("Sequence number wrapped "
+			                         "beyond 32 bits while Xlib "
+						 "did not own the socket",
+			                         xcb_xlib_seq_number_wrapped);
+		}
+		dpy->xcb->last_flushed = dpy->request = sent;
+		dpy->bufmax = dpy->xcb->real_bufmax;
+	}
+}
+
+/* Call internal connection callbacks for any fds that are currently
+ * ready to read. This function will not block unless one of the
+ * callbacks blocks.
+ *
+ * This code borrowed from _XWaitForReadable. Inverse call tree:
+ * _XRead
+ *  _XWaitForWritable
+ *   _XFlush
+ *   _XSend
+ *  _XEventsQueued
+ *  _XReadEvents
+ *  _XRead[0-9]+
+ *   _XAllocIDs
+ *  _XReply
+ *  _XEatData
+ * _XReadPad
+ */
+static void check_internal_connections(Display *dpy)
+{
+	struct _XConnectionInfo *ilist;
+	fd_set r_mask;
+	struct timeval tv;
+	int result;
+	int highest_fd = -1;
+
+	if(dpy->flags & XlibDisplayProcConni || !dpy->im_fd_info)
+		return;
+
+	FD_ZERO(&r_mask);
+	for(ilist = dpy->im_fd_info; ilist; ilist = ilist->next)
+	{
+		assert(ilist->fd >= 0);
+		FD_SET(ilist->fd, &r_mask);
+		if(ilist->fd > highest_fd)
+			highest_fd = ilist->fd;
+	}
+	assert(highest_fd >= 0);
+
+	tv.tv_sec = 0;
+	tv.tv_usec = 0;
+	result = select(highest_fd + 1, &r_mask, NULL, NULL, &tv);
+
+	if(result == -1)
+	{
+		if(errno == EINTR)
+			return;
+		_XIOError(dpy);
+	}
+
+	for(ilist = dpy->im_fd_info; result && ilist; ilist = ilist->next)
+		if(FD_ISSET(ilist->fd, &r_mask))
+		{
+			_XProcessInternalConnection(dpy, ilist);
+			--result;
+		}
+}
+
+static PendingRequest *append_pending_request(Display *dpy, unsigned long sequence)
+{
+	PendingRequest *node = malloc(sizeof(PendingRequest));
+	assert(node);
+	node->next = NULL;
+	node->sequence = sequence;
+	node->reply_waiter = 0;
+	if(dpy->xcb->pending_requests_tail)
+	{
+		if (XLIB_SEQUENCE_COMPARE(dpy->xcb->pending_requests_tail->sequence,
+		                          >=, node->sequence))
+			throw_thread_fail_assert("Unknown sequence number "
+			                         "while appending request",
+			                         xcb_xlib_unknown_seq_number);
+		if (dpy->xcb->pending_requests_tail->next != NULL)
+			throw_thread_fail_assert("Unknown request in queue "
+			                         "while appending request",
+			                         xcb_xlib_unknown_req_pending);
+		dpy->xcb->pending_requests_tail->next = node;
+	}
+	else
+		dpy->xcb->pending_requests = node;
+	dpy->xcb->pending_requests_tail = node;
+	return node;
+}
+
+static void dequeue_pending_request(Display *dpy, PendingRequest *req)
+{
+	if (req != dpy->xcb->pending_requests)
+		throw_thread_fail_assert("Unknown request in queue while "
+		                         "dequeuing",
+		                         xcb_xlib_unknown_req_in_deq);
+
+	dpy->xcb->pending_requests = req->next;
+	if(!dpy->xcb->pending_requests)
+	{
+		if (req != dpy->xcb->pending_requests_tail)
+			throw_thread_fail_assert("Unknown request in queue "
+			                         "while dequeuing",
+			                         xcb_xlib_unknown_req_in_deq);
+		dpy->xcb->pending_requests_tail = NULL;
+	}
+	else if (XLIB_SEQUENCE_COMPARE(req->sequence, >=,
+	                               dpy->xcb->pending_requests->sequence))
+		throw_thread_fail_assert("Unknown sequence number while "
+		                         "dequeuing request",
+		                         xcb_xlib_threads_sequence_lost);
+
+	free(req);
+}
+
+static int handle_error(Display *dpy, xError *err, Bool in_XReply)
+{
+	_XExtension *ext;
+	int ret_code;
+	/* Oddly, Xlib only allows extensions to suppress errors when
+	 * those errors were seen by _XReply. */
+	if(in_XReply)
+		/*
+		 * we better see if there is an extension who may
+		 * want to suppress the error.
+		 */
+		for(ext = dpy->ext_procs; ext; ext = ext->next)
+			if(ext->error && (*ext->error)(dpy, err, &ext->codes, &ret_code))
+				return ret_code;
+	_XError(dpy, err);
+	return 0;
+}
+
+/* Widen a 32-bit sequence number into a native-word-size (unsigned long)
+ * sequence number.  Treating the comparison as a 1 and shifting it avoids a
+ * conditional branch, and shifting by 16 twice avoids a compiler warning when
+ * sizeof(unsigned long) == 4. */
+static void widen(unsigned long *wide, unsigned int narrow)
+{
+	unsigned long new = (*wide & ~0xFFFFFFFFUL) | narrow;
+	*wide = new + ((unsigned long) (new < *wide) << 16 << 16);
+}
+
+/* Thread-safety rules:
+ *
+ * At most one thread can be reading from XCB's event queue at a time.
+ * If you are not the current event-reading thread and you need to find
+ * out if an event is available, you must wait.
+ *
+ * The same rule applies for reading replies.
+ *
+ * A single thread cannot be both the the event-reading and the
+ * reply-reading thread at the same time.
+ *
+ * We always look at both the current event and the first pending reply
+ * to decide which to process next.
+ *
+ * We always process all responses in sequence-number order, which may
+ * mean waiting for another thread (either the event_waiter or the
+ * reply_waiter) to handle an earlier response before we can process or
+ * return a later one. If so, we wait on the corresponding condition
+ * variable for that thread to process the response and wake us up.
+ */
+
+static xcb_generic_reply_t *poll_for_event(Display *dpy)
+{
+	/* Make sure the Display's sequence numbers are valid */
+	require_socket(dpy);
+
+	/* Precondition: This thread can safely get events from XCB. */
+	assert(dpy->xcb->event_owner == XlibOwnsEventQueue && !dpy->xcb->event_waiter);
+
+	if(!dpy->xcb->next_event)
+		dpy->xcb->next_event = xcb_poll_for_event(dpy->xcb->connection);
+
+	if(dpy->xcb->next_event)
+	{
+		PendingRequest *req = dpy->xcb->pending_requests;
+		xcb_generic_event_t *event = dpy->xcb->next_event;
+		unsigned long event_sequence = dpy->last_request_read;
+		widen(&event_sequence, event->full_sequence);
+		if(!req || XLIB_SEQUENCE_COMPARE(event_sequence, <, req->sequence)
+		        || (event->response_type != X_Error && event_sequence == req->sequence))
+		{
+			if (XLIB_SEQUENCE_COMPARE(event_sequence, >,
+			                          dpy->request))
+			{
+				throw_thread_fail_assert("Unknown sequence "
+				                         "number while "
+							 "processing queue",
+				                xcb_xlib_threads_sequence_lost);
+			}
+			dpy->last_request_read = event_sequence;
+			dpy->xcb->next_event = NULL;
+			return (xcb_generic_reply_t *) event;
+		}
+	}
+	return NULL;
+}
+
+static xcb_generic_reply_t *poll_for_response(Display *dpy)
+{
+	void *response;
+	xcb_generic_error_t *error;
+	PendingRequest *req;
+	while(!(response = poll_for_event(dpy)) &&
+	      (req = dpy->xcb->pending_requests) &&
+	      !req->reply_waiter &&
+	      xcb_poll_for_reply(dpy->xcb->connection, req->sequence, &response, &error))
+	{
+		if(XLIB_SEQUENCE_COMPARE(req->sequence, >, dpy->request))
+		{
+			throw_thread_fail_assert("Unknown sequence number "
+			                         "while awaiting reply",
+			                        xcb_xlib_threads_sequence_lost);
+		}
+		dpy->last_request_read = req->sequence;
+		if(response)
+			break;
+		dequeue_pending_request(dpy, req);
+		if(error)
+			return (xcb_generic_reply_t *) error;
+	}
+	return response;
+}
+
+static void handle_response(Display *dpy, xcb_generic_reply_t *response, Bool in_XReply)
+{
+	_XAsyncHandler *async, *next;
+	switch(response->response_type)
+	{
+	case X_Reply:
+		for(async = dpy->async_handlers; async; async = next)
+		{
+			next = async->next;
+			if(async->handler(dpy, (xReply *) response, (char *) response, sizeof(xReply) + (response->length << 2), async->data))
+				break;
+		}
+		break;
+
+	case X_Error:
+		handle_error(dpy, (xError *) response, in_XReply);
+		break;
+
+	default: /* event */
+		/* GenericEvents may be > 32 bytes. In this case, the
+		 * event struct is trailed by the additional bytes. the
+		 * xcb_generic_event_t struct uses 4 bytes for internal
+		 * numbering, so we need to shift the trailing data to
+		 * be after the first 32 bytes. */
+		if(response->response_type == GenericEvent && ((xcb_ge_event_t *) response)->length)
+		{
+			xcb_ge_event_t *event = (xcb_ge_event_t *) response;
+			memmove(&event->full_sequence, &event[1], event->length * 4);
+		}
+		_XEnq(dpy, (xEvent *) response);
+		break;
+	}
+	free(response);
+}
+
+int _XEventsQueued(Display *dpy, int mode)
+{
+	xcb_generic_reply_t *response;
+	if(dpy->flags & XlibDisplayIOError)
+		return 0;
+	if(dpy->xcb->event_owner != XlibOwnsEventQueue)
+		return 0;
+
+	if(mode == QueuedAfterFlush)
+		_XSend(dpy, NULL, 0);
+	else
+		check_internal_connections(dpy);
+
+	/* If another thread is blocked waiting for events, then we must
+	 * let that thread pick up the next event. Since it blocked, we
+	 * can reasonably claim there are no new events right now. */
+	if(!dpy->xcb->event_waiter)
+	{
+		while((response = poll_for_response(dpy)))
+			handle_response(dpy, response, False);
+		if(xcb_connection_has_error(dpy->xcb->connection))
+			_XIOError(dpy);
+	}
+	return dpy->qlen;
+}
+
+/* _XReadEvents - Flush the output queue,
+ * then read as many events as possible (but at least 1) and enqueue them
+ */
+void _XReadEvents(Display *dpy)
+{
+	xcb_generic_reply_t *response;
+	unsigned long serial;
+
+	if(dpy->flags & XlibDisplayIOError)
+		return;
+	_XSend(dpy, NULL, 0);
+	if(dpy->xcb->event_owner != XlibOwnsEventQueue)
+		return;
+	check_internal_connections(dpy);
+
+	serial = dpy->next_event_serial_num;
+	while(serial == dpy->next_event_serial_num || dpy->qlen == 0)
+	{
+		if(dpy->xcb->event_waiter)
+		{
+			ConditionWait(dpy, dpy->xcb->event_notify);
+			/* Maybe the other thread got us an event. */
+			continue;
+		}
+
+		if(!dpy->xcb->next_event)
+		{
+			xcb_generic_event_t *event;
+			dpy->xcb->event_waiter = 1;
+			UnlockDisplay(dpy);
+			event = xcb_wait_for_event(dpy->xcb->connection);
+			/* It appears that classic Xlib respected user
+			 * locks when waking up after waiting for
+			 * events. However, if this thread did not have
+			 * any user locks, and another thread takes a
+			 * user lock and tries to read events, then we'd
+			 * deadlock. So we'll choose to let the thread
+			 * that got in first consume events, despite the
+			 * later thread's user locks. */
+			InternalLockDisplay(dpy, /* ignore user locks */ 1);
+			dpy->xcb->event_waiter = 0;
+			ConditionBroadcast(dpy, dpy->xcb->event_notify);
+			if(!event)
+				_XIOError(dpy);
+			dpy->xcb->next_event = event;
+		}
+
+		/* We've established most of the conditions for
+		 * poll_for_response to return non-NULL. The exceptions
+		 * are connection shutdown, and finding that another
+		 * thread is waiting for the next reply we'd like to
+		 * process. */
+
+		response = poll_for_response(dpy);
+		if(response)
+			handle_response(dpy, response, False);
+		else if(dpy->xcb->pending_requests->reply_waiter)
+		{ /* need braces around ConditionWait */
+			ConditionWait(dpy, dpy->xcb->reply_notify);
+		}
+		else
+			_XIOError(dpy);
+	}
+
+	/* The preceding loop established that there is no
+	 * event_waiter--unless we just called ConditionWait because of
+	 * a reply_waiter, in which case another thread may have become
+	 * the event_waiter while we slept unlocked. */
+	if(!dpy->xcb->event_waiter)
+		while((response = poll_for_response(dpy)))
+			handle_response(dpy, response, False);
+	if(xcb_connection_has_error(dpy->xcb->connection))
+		_XIOError(dpy);
+}
+
+/*
+ * _XSend - Flush the buffer and send the client data. 32 bit word aligned
+ * transmission is used, if size is not 0 mod 4, extra bytes are transmitted.
+ *
+ * Note that the connection must not be read from once the data currently
+ * in the buffer has been written.
+ */
+void _XSend(Display *dpy, const char *data, long size)
+{
+	static const xReq dummy_request;
+	static char const pad[3];
+	struct iovec vec[3];
+	uint64_t requests;
+	_XExtension *ext;
+	xcb_connection_t *c = dpy->xcb->connection;
+	if(dpy->flags & XlibDisplayIOError)
+		return;
+
+	if(dpy->bufptr == dpy->buffer && !size)
+		return;
+
+	/* iff we asked XCB to set aside errors, we must pick those up
+	 * eventually. iff there are async handlers, we may have just
+	 * issued requests that will generate replies. in either case,
+	 * we need to remember to check later. */
+	if(dpy->xcb->event_owner != XlibOwnsEventQueue || dpy->async_handlers)
+	{
+		uint64_t sequence;
+		for(sequence = dpy->xcb->last_flushed + 1; sequence <= dpy->request; ++sequence)
+			append_pending_request(dpy, sequence);
+	}
+	requests = dpy->request - dpy->xcb->last_flushed;
+	dpy->xcb->last_flushed = dpy->request;
+
+	vec[0].iov_base = dpy->buffer;
+	vec[0].iov_len = dpy->bufptr - dpy->buffer;
+	vec[1].iov_base = (char *)data;
+	vec[1].iov_len = size;
+	vec[2].iov_base = (char *)pad;
+	vec[2].iov_len = -size & 3;
+
+	for(ext = dpy->flushes; ext; ext = ext->next_flush)
+	{
+		int i;
+		for(i = 0; i < 3; ++i)
+			if(vec[i].iov_len)
+				ext->before_flush(dpy, &ext->codes, vec[i].iov_base, vec[i].iov_len);
+	}
+
+	if(xcb_writev(c, vec, 3, requests) < 0)
+		_XIOError(dpy);
+	dpy->bufptr = dpy->buffer;
+	dpy->last_req = (char *) &dummy_request;
+
+	check_internal_connections(dpy);
+
+	_XSetSeqSyncFunction(dpy);
+}
+
+/*
+ * _XFlush - Flush the X request buffer.  If the buffer is empty, no
+ * action is taken.
+ */
+void _XFlush(Display *dpy)
+{
+	require_socket(dpy);
+	_XSend(dpy, NULL, 0);
+
+	_XEventsQueued(dpy, QueuedAfterReading);
+}
+
+static const XID inval_id = ~0UL;
+
+void _XIDHandler(Display *dpy)
+{
+	if (dpy->xcb->next_xid == inval_id)
+		_XAllocIDs(dpy, &dpy->xcb->next_xid, 1);
+}
+
+/* _XAllocID - resource ID allocation routine. */
+XID _XAllocID(Display *dpy)
+{
+	XID ret = dpy->xcb->next_xid;
+	assert (ret != inval_id);
+	dpy->xcb->next_xid = inval_id;
+	_XSetPrivSyncFunction(dpy);
+	return ret;
+}
+
+/* _XAllocIDs - multiple resource ID allocation routine. */
+void _XAllocIDs(Display *dpy, XID *ids, int count)
+{
+	int i;
+#ifdef XTHREADS
+	if (dpy->lock)
+		(*dpy->lock->user_lock_display)(dpy);
+	UnlockDisplay(dpy);
+#endif
+	for (i = 0; i < count; i++)
+		ids[i] = xcb_generate_id(dpy->xcb->connection);
+#ifdef XTHREADS
+	InternalLockDisplay(dpy, /* don't skip user locks */ 0);
+	if (dpy->lock)
+		(*dpy->lock->user_unlock_display)(dpy);
+#endif
+}
+
+static void _XFreeReplyData(Display *dpy, Bool force)
+{
+	if(!force && dpy->xcb->reply_consumed < dpy->xcb->reply_length)
+		return;
+	free(dpy->xcb->reply_data);
+	dpy->xcb->reply_data = NULL;
+}
+
+/*
+ * _XReply - Wait for a reply packet and copy its contents into the
+ * specified rep.
+ * extra: number of 32-bit words expected after the reply
+ * discard: should I discard data following "extra" words?
+ */
+Status _XReply(Display *dpy, xReply *rep, int extra, Bool discard)
+{
+	xcb_generic_error_t *error;
+	xcb_connection_t *c = dpy->xcb->connection;
+	char *reply;
+	PendingRequest *current;
+
+	if (dpy->xcb->reply_data)
+		throw_extlib_fail_assert("Extra reply data still left in queue",
+		                         xcb_xlib_extra_reply_data_left);
+
+	if(dpy->flags & XlibDisplayIOError)
+		return 0;
+
+	_XSend(dpy, NULL, 0);
+	if(dpy->xcb->pending_requests_tail && dpy->xcb->pending_requests_tail->sequence == dpy->request)
+		current = dpy->xcb->pending_requests_tail;
+	else
+		current = append_pending_request(dpy, dpy->request);
+	/* Don't let any other thread get this reply. */
+	current->reply_waiter = 1;
+
+	while(1)
+	{
+		PendingRequest *req = dpy->xcb->pending_requests;
+		xcb_generic_reply_t *response;
+
+		if(req != current && req->reply_waiter)
+		{
+			ConditionWait(dpy, dpy->xcb->reply_notify);
+			/* Another thread got this reply. */
+			continue;
+		}
+		req->reply_waiter = 1;
+		UnlockDisplay(dpy);
+		response = xcb_wait_for_reply(c, req->sequence, &error);
+		/* Any user locks on another thread must have been taken
+		 * while we slept in xcb_wait_for_reply. Classic Xlib
+		 * ignored those user locks in this case, so we do too. */
+		InternalLockDisplay(dpy, /* ignore user locks */ 1);
+
+		/* We have the response we're looking for. Now, before
+		 * letting anyone else process this sequence number, we
+		 * need to process any events that should have come
+		 * earlier. */
+
+		if(dpy->xcb->event_owner == XlibOwnsEventQueue)
+		{
+			xcb_generic_reply_t *event;
+			/* If some thread is already waiting for events,
+			 * it will get the first one. That thread must
+			 * process that event before we can continue. */
+			/* FIXME: That event might be after this reply,
+			 * and might never even come--or there might be
+			 * multiple threads trying to get events. */
+			while(dpy->xcb->event_waiter)
+			{ /* need braces around ConditionWait */
+				ConditionWait(dpy, dpy->xcb->event_notify);
+			}
+			while((event = poll_for_event(dpy)))
+				handle_response(dpy, event, True);
+		}
+
+		req->reply_waiter = 0;
+		ConditionBroadcast(dpy, dpy->xcb->reply_notify);
+		if(XLIB_SEQUENCE_COMPARE(req->sequence, >, dpy->request)) {
+			throw_thread_fail_assert("Unknown sequence number "
+			                         "while processing reply",
+			                        xcb_xlib_threads_sequence_lost);
+		}
+		dpy->last_request_read = req->sequence;
+		if(!response)
+			dequeue_pending_request(dpy, req);
+
+		if(req == current)
+		{
+			reply = (char *) response;
+			break;
+		}
+
+		if(error)
+			handle_response(dpy, (xcb_generic_reply_t *) error, True);
+		else if(response)
+			handle_response(dpy, response, True);
+	}
+	check_internal_connections(dpy);
+
+	if(dpy->xcb->next_event && dpy->xcb->next_event->response_type == X_Error)
+	{
+		xcb_generic_event_t *event = dpy->xcb->next_event;
+		unsigned long event_sequence = dpy->last_request_read;
+		widen(&event_sequence, event->full_sequence);
+		if(event_sequence == dpy->last_request_read)
+		{
+			error = (xcb_generic_error_t *) event;
+			dpy->xcb->next_event = NULL;
+		}
+	}
+
+	if(error)
+	{
+		int ret_code;
+
+		/* Xlib is evil and assumes that even errors will be
+		 * copied into rep. */
+		memcpy(rep, error, 32);
+
+		/* do not die on "no such font", "can't allocate",
+		   "can't grab" failures */
+		switch(error->error_code)
+		{
+			case BadName:
+				switch(error->major_code)
+				{
+					case X_LookupColor:
+					case X_AllocNamedColor:
+						free(error);
+						return 0;
+				}
+				break;
+			case BadFont:
+				if(error->major_code == X_QueryFont) {
+					free(error);
+					return 0;
+				}
+				break;
+			case BadAlloc:
+			case BadAccess:
+				free(error);
+				return 0;
+		}
+
+		ret_code = handle_error(dpy, (xError *) error, True);
+		free(error);
+		return ret_code;
+	}
+
+	/* it's not an error, but we don't have a reply, so it's an I/O
+	 * error. */
+	if(!reply)
+	{
+		_XIOError(dpy);
+		return 0;
+	}
+
+	/* there's no error and we have a reply. */
+	dpy->xcb->reply_data = reply;
+	dpy->xcb->reply_consumed = sizeof(xReply) + (extra * 4);
+	dpy->xcb->reply_length = sizeof(xReply);
+	if(dpy->xcb->reply_data[0] == 1)
+		dpy->xcb->reply_length += (((xcb_generic_reply_t *) dpy->xcb->reply_data)->length * 4);
+
+	/* error: Xlib asks too much. give them what we can anyway. */
+	if(dpy->xcb->reply_length < dpy->xcb->reply_consumed)
+		dpy->xcb->reply_consumed = dpy->xcb->reply_length;
+
+	memcpy(rep, dpy->xcb->reply_data, dpy->xcb->reply_consumed);
+	_XFreeReplyData(dpy, discard);
+	return 1;
+}
+
+int _XRead(Display *dpy, char *data, long size)
+{
+	assert(size >= 0);
+	if(size == 0)
+		return 0;
+	if(dpy->xcb->reply_data == NULL ||
+	   dpy->xcb->reply_consumed + size > dpy->xcb->reply_length)
+		throw_extlib_fail_assert("Too much data requested from _XRead",
+		                         xcb_xlib_too_much_data_requested);
+	memcpy(data, dpy->xcb->reply_data + dpy->xcb->reply_consumed, size);
+	dpy->xcb->reply_consumed += size;
+	_XFreeReplyData(dpy, False);
+	return 0;
+}
+
+/*
+ * _XReadPad - Read bytes from the socket taking into account incomplete
+ * reads.  If the number of bytes is not 0 mod 4, read additional pad
+ * bytes.
+ */
+void _XReadPad(Display *dpy, char *data, long size)
+{
+	_XRead(dpy, data, size);
+	dpy->xcb->reply_consumed += -size & 3;
+	_XFreeReplyData(dpy, False);
+}
+
+/* Read and discard "n" 8-bit bytes of data */
+void _XEatData(Display *dpy, unsigned long n)
+{
+	dpy->xcb->reply_consumed += n;
+	_XFreeReplyData(dpy, False);
+}