Which is great, except that ctx_new() requires a malloc, which then can fail, and now you can't even explain why the thing failed, as you have no context info.
You also have to worry about all of the ctx objects you've created along the way, to free them up as you recover from the low memory error.
You also have to worry about all of the ctx objects you've created along the way, to free them up as you recover from the low memory error.