Hello,
I'd like to know what is the purpose of the nonblock symbols of the
iflag and oflag options.
From what I understand after reading the source-code, it merely sets
the O_NONBLOCK flag on the file descriptor, but does not _actually_
checks for the EGAIN errno.
What was the idea/use for this flag when it was introduced in 2004 ?
The man page for open(2) says that this is a noop for regular files and
block devices. What error specific to using the nonblock flag would
happen in dd if used on targets supporting the O_NONBLOCK flag ?
Cordially,
Léo
