Two simple questions related to the following puzzling behaviour:
I have the following line of code:
where _display_p is a valid Display* returned from XOpenDisplay() and ks has the value 103 (which was returned by XStringToKeysym(), and corresponds to 'g').
The above line of code hangs indefinitely; I have to kill the job manually.
Question #1: why is this happening? I can't see anything in any documentation that suggests that XKeysymToKeycode() can ever fail to return.
Ok - this is C, you assert the _display_p variable is valid. You know this how?
Please post your code.
The pertinent class is called keyboard_queue.
In the class definition, there is:
The constructor provides a value for this in the initializer list:
The value is tested inside the construstor, just in case the call to XOpenDisplay() failed:
Then, inside a member function called push_key_press, occurs the line that hangs (I have temporarily, while testing, replaced the call to the variable ks of type KeySym with an explicit value, XK_g):
Following the initialisation of _display_p in the class constructor, the only place that _display_p is used is in direct calls to X functions: I never access it myself.
If I remove the line that hangs, and code that depends on it, then everything else -- in particular, all the calls to X functions, both prior to and subsequent to the offending line -- works as expected.
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