document that waitpid raises OSError
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@ -1883,6 +1883,9 @@ written in Python, such as a mail server's external command delivery program.
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``-1``, status is requested for any process in the process group ``-pid`` (the
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absolute value of *pid*).
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An :exc:`OSError` is raised with the value of errno when the syscall
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returns -1.
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On Windows: Wait for completion of a process given by process handle *pid*, and
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return a tuple containing *pid*, and its exit status shifted left by 8 bits
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(shifting makes cross-platform use of the function easier). A *pid* less than or
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