From 5ee04c24c5b7cafc7ed01ae586b5910be73271ff Mon Sep 17 00:00:00 2001
From: Ulrich Sibiller <uli42@gmx.de>
Date: Fri, 24 Jun 2016 21:22:01 +0200
Subject: libX11: Extend Event functions to handle IOErrors

To allow for suspend/resume NX has changed _XReadEvents() and
_XIOError(). _XIOError() does not simply exit but returns. And
_XReadEvents() returns after _XIOError(). But as the original
_XReadEvents() is supposed to block until at least one event is there
calling functions are not prepared for situations where no event is
available. These calling functions have to check that condition.,

Some of the calling functions already had that check but the
UnlockDisplay() call was missing.

Fixes https://github.com/ArcticaProject/nx-libs/issues/118
---
 nx-X11/lib/X11/IfEvent.c   | 1 +
 nx-X11/lib/X11/MaskEvent.c | 1 +
 nx-X11/lib/X11/NextEvent.c | 6 ++++++
 nx-X11/lib/X11/PeekEvent.c | 6 ++++++
 nx-X11/lib/X11/PeekIfEv.c  | 1 +
 nx-X11/lib/X11/WinEvent.c  | 6 ++++++
 6 files changed, 21 insertions(+)

diff --git a/nx-X11/lib/X11/IfEvent.c b/nx-X11/lib/X11/IfEvent.c
index a7c0cb188..9cf07f56d 100644
--- a/nx-X11/lib/X11/IfEvent.c
+++ b/nx-X11/lib/X11/IfEvent.c
@@ -73,6 +73,7 @@ XIfEvent (dpy, event, predicate, arg)
 		prev = NULL;
 #ifdef NX_TRANS_SOCKET
             if (_XGetIOError(dpy)) {
+                UnlockDisplay(dpy);
                 return 0;
             }
 #endif
diff --git a/nx-X11/lib/X11/MaskEvent.c b/nx-X11/lib/X11/MaskEvent.c
index c48a960d2..a46766685 100644
--- a/nx-X11/lib/X11/MaskEvent.c
+++ b/nx-X11/lib/X11/MaskEvent.c
@@ -77,6 +77,7 @@ XMaskEvent (dpy, mask, event)
 		prev = NULL;
 #ifdef NX_TRANS_SOCKET
             if (_XGetIOError(dpy)) {
+                UnlockDisplay(dpy);
                 return 0;
             }
 #endif
diff --git a/nx-X11/lib/X11/NextEvent.c b/nx-X11/lib/X11/NextEvent.c
index 1c9080651..71d84223e 100644
--- a/nx-X11/lib/X11/NextEvent.c
+++ b/nx-X11/lib/X11/NextEvent.c
@@ -48,6 +48,12 @@ XNextEvent (dpy, event)
 	
 	if (dpy->head == NULL)
 	    _XReadEvents(dpy);
+#ifdef NX_TRANS_SOCKET
+	if (_XGetIOError(dpy)) {
+	    UnlockDisplay(dpy);
+	    return 0;
+	}
+#endif
 	qelt = dpy->head;
 	*event = qelt->event;
 	_XDeq(dpy, NULL, qelt);
diff --git a/nx-X11/lib/X11/PeekEvent.c b/nx-X11/lib/X11/PeekEvent.c
index b89c6c95e..b8d755f0a 100644
--- a/nx-X11/lib/X11/PeekEvent.c
+++ b/nx-X11/lib/X11/PeekEvent.c
@@ -46,6 +46,12 @@ XPeekEvent (dpy, event)
 	LockDisplay(dpy);
 	if (dpy->head == NULL)
 	    _XReadEvents(dpy);
+#ifdef NX_TRANS_SOCKET
+	if (_XGetIOError(dpy)) {
+	    UnlockDisplay(dpy);
+	    return 1;
+	}
+#endif
 	*event = (dpy->head)->event;
 	UnlockDisplay(dpy);
 	return 1;
diff --git a/nx-X11/lib/X11/PeekIfEv.c b/nx-X11/lib/X11/PeekIfEv.c
index a8da27932..93a725b49 100644
--- a/nx-X11/lib/X11/PeekIfEv.c
+++ b/nx-X11/lib/X11/PeekIfEv.c
@@ -73,6 +73,7 @@ XPeekIfEvent (dpy, event, predicate, arg)
 		prev = NULL;
 #ifdef NX_TRANS_SOCKET
             if (_XGetIOError(dpy)) {
+                UnlockDisplay(dpy);
                 return 0;
             }
 #endif
diff --git a/nx-X11/lib/X11/WinEvent.c b/nx-X11/lib/X11/WinEvent.c
index 67e825cb5..961fcf74b 100644
--- a/nx-X11/lib/X11/WinEvent.c
+++ b/nx-X11/lib/X11/WinEvent.c
@@ -79,5 +79,11 @@ XWindowEvent (dpy, w, mask, event)
 	    if (prev && prev->qserial_num != qe_serial)
 		/* another thread has snatched this event */
 		prev = NULL;
+#ifdef NX_TRANS_SOCKET
+	    if (_XGetIOError(dpy)) {
+	      UnlockDisplay(dpy);
+	      return 0;
+	    }
+#endif
 	}
 }
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