Closing libUV Handles Correctly

Question

I\'m trying to find out how to fix these memory leaks I\'m getting while running this program with Valgrind. The leaks occur with the two allocations in nShell_client_main

Answer 1

libuv is not done with a handle until it's close callback is called. That is the exact moment when you can free the handle.

I see you call uv_loop_close, but you don't check for the return value. If there are still pending handles, it will return UV_EBUSY, so you should check for that.

If you want to close a loop and close all handles, you need to do the following:

• Use uv_stop to stop the loop
• Use uv_walk and call uv_close on all handles which are not closing
• Run the loop again with uv_run so all close callbacks are called and you can free the memory in the callbacks
• Call uv_loop_close, it should return 0 now