[issue3002] shutil.copyfile blocks indefinitely on named pipes

[Ralf Schmitt]

Ralf Schmitt <schmir at gmail.com> added the comment:

The open('fifo', 'rb') already blocks. One has to use os.fdopen with
O_NONBLOCK to prevent blocking.

fd=os.open('fifo', os.O_RDONLY | os.O_NONBLOCK)

and then use

stat.S_ISFIFO(os.fstat(fd).st_mode)

to check if this is a fifo.
Checking with os.stat before opening with open will result in a race
condition.

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