Ensure that temporary file is used only by one process #309
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mkstemp(3)
ensures that a unique file is created, but in the previous implementation, there's a possibility that a processuses the temporary file created by another process if
mkstemp(3)
fails to create a file due to EEXIST. That has the same risk as #174.This PR will also resolve #177 if the cause is that multiple processes try to create a file with the same name at the same time.