Check if files being copied are FIFOs in copyFile
#24148
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Raise `OSError` if any of the operands is a FIFO. POSIX only for now...
the dest parameter may not exist and a non existant source is handled later in the code
well windows also have them but that's another problem...
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Check if files being copied are FIFOs in
copyFileAvoids the deadlock behavior by simply raising an
OSErrorif eithersourceordestis a FIFO before the actual copying operation.Relevant issue reported on this thread by user firasuke.