io_wait man page on Alpinelinux

io_wait man page on Alpinelinux

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io_wait(3)							    io_wait(3)

NAME
       io_wait - wait for events

SYNTAX
       #include <io.h>

       void io_wait();

DESCRIPTION
       io_wait()  checks  the descriptors that the program is interested in to
       see whether any of them are ready. If none of them are ready, io_wait()
       tries  to  pause	 until	one of them is ready, so that it does not take
       time away from other programs running on the same computer.

       io_wait pays attention to timeouts: if a descriptor reaches  its	 time‐
       out,  and the program is interested in reading or writing that descrip‐
       tor, io_wait will return promptly.

       Under some circumstances, io_wait will return even though no  interest‐
       ing  descriptors	 are  ready.  Do not assume that a descriptor is ready
       merely because io_wait has returned.

       io_wait is not interrupted by the delivery of a signal.	Programs  that
       expect  interruption are unreliable: they will block if the same signal
       is delivered a moment before io_wait. The correct way to handle signals
       is with the self-pipe trick.

SEE ALSO
       io_waituntil(3), io_check(3), io_wantread(3), io_wantwrite(3), io_fd(3)

								    io_wait(3)

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