Alan Cox wrote:
Ar Iau, 2006-07-27 am 20:05 +0300, ysgrifennodd Pekka J Enberg:
Sure. Though I wonder if sys_frevoke is enough for us and we can drop
sys_revoke completely.
Alas not. Some Unix devices have side effects when you open() them.
Dumb thought: would it make sense to add an O_CAREFUL flag to open(), to
disable side effects? It seems that a number of devices have this issue
and one have to jump through weird hoops to configure them. Obviously,
a file descriptor obtained with O_CAREFUL may not be fully functional,
at the device driver's option.
For a conventional file, directory, or block device O_CAREFUL is a
no-op. For ttys it would typically behave similar to O_NONBLOCK
followed immediately by a fcntl to clear the nonblock flag.
-hpa
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