missing os.waitid exposure
Created originally on Bitbucket by oremanj (Joshua Oreman)
CPython exposes os.waitid() on platforms where waitid() is defined by the system C library, which among other features allows one to wait for a process to exit without consuming its exit status. It would be useful to be able to use this on PyPy as well, along with the associated os.P_PID/os.P_PGID/os.P_ANY and os.WEXITED/os.WNOWAIT/etc constants.
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