linux下的qt，如何检测一个进程已经在运行？

Question

I am developing under ubuntu 16.04. The issue I run into is: I want to detect whether the user has already started the application, if yes, it exits directly.

I have tried using QLocalServer , QSharedMemory to achieve that. But the problem is:

If the program crash without properly close the local server or destroy the shared memory , the local socket/shared memory will remain in the OS and prevent the user to launch the program again.

How to deal with this?

Answer 1

For the shared memory issue you could take a look at this question QSharedMemory is not getting deleted on Application crash

For a more generic answer about having a single instance of an application, you can take a look at Qt Single Application which is part of qt-solutions