(ddd.info)Stopping X Programs

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5.4 Stopping X Programs
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If your program is a modal X application, DDD may interrupt it while it
has grabbed the mouse pointer, making further interaction
impossible--your X display will be unresponsive to any user actions.

   By default, DDD will check after each interaction whether the
pointer is grabbed.  If the pointer is grabbed, DDD will continue the
debugged program such that you can continue to use your X display.

   This is how this feature works: When the program stops, DDD checks
for input events such as keyboard or mouse interaction.  If DDD does
not receive any event within the next 5 seconds, DDD checks whether the
mouse pointer is grabbed by attempting to grab and ungrab it.  If this
attempt fails, then DDD considers the pointer grabbed.

   Unfortunately, DDD cannot determine the program that grabbed the
pointer--it may be the debugged program, or another program.
Consequently, you have another 10 seconds to cancel continuation before
DDD continues the program automatically.

   There is one situation where this fails: if you lock your X display
while DDD is running, then DDD will consider a resulting pointer grab
as a result of running the program--and automatically continue
execution of the debugged program.  Consequently, you can turn off this
feature via `Edit => Preferences => General => Continue Automatically
when Mouse Pointer is Frozen'.

Customizing Grab Checking