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H A Dftpcmd.ydiff 117352 Wed Jul 09 11:54:33 MDT 2003 yar Block SIGURG while reading from the control channel.

Rationale:

SIGURG is configured by ftpd to interrupt system calls, which is useful
during data transfers. However, SIGURG could interrupt I/O on the
control channel as well, which was mistaken for the end of the session.

A practical example could be aborting the download of a tiny file,
when the abort sequence reached ftpd after ftpd had passed the file
data to the system and returned to its command loop.

Reported by: ceri
MFC after: 1 week

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