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The signals listed in this section are used in conjunction with
asynchronous I/O facilities. You have to take explicit action by
fcntl to enable a particular file descriptor to generate
these signals (see section 13.16 Interrupt-Driven Input). The default action for these
signals is to ignore them.
On most operating systems, terminals and sockets are the only kinds of
files that can generate
SIGIO; other kinds, including ordinary
files, never generate
SIGIO even if you ask them to.
In the GNU system
SIGIO will always be generated properly
if you successfully set asynchronous mode with
SIGIO. It is defined only for compatibility.
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