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 timeout, and  the  program
       is interested in reading or writing that descriptor, io_wait will return promptly.

       Under  some  circumstances, io_wait will return even though no interesting 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)