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linux: wait for process before detach, and send SIGCONT
I had issues with the ptrace call failing because the process had not yet stopped from SIGSTOP. From this stackoverflow answer, it seems that you can use waitpid to wait until the process is actually stopped. In python, this is exposed as os.waitpid. https://stackoverflow.com/questions/20510300/ptrace-detach-fails-after-ptrace-cont-with-errno-esrch#20525326 Additionally, the process was left frozen. I send a SIGCONT to continue the process after the detach, so that it isn't left stopped.master
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