aio_waitcomplete man page on FreeBSD

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AIO_WAITCOMPLETE(2)	    BSD System Calls Manual	   AIO_WAITCOMPLETE(2)

NAME
     aio_waitcomplete — wait for the next completion of an aio request

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <aio.h>

     int
     aio_waitcomplete(struct aiocb **iocbp, struct timespec *timeout);

DESCRIPTION
     The aio_waitcomplete() system call waits for completion of an asynchro‐
     nous I/O request.	Upon completion, aio_waitcomplete() returns the result
     of the function and sets iocbp to point to the structure associated with
     the original request.  If an asynchronous I/O request is completed before
     aio_waitcomplete() is called, it returns immediately with the completed
     request.

     If timeout is a non-NULL pointer, it specifies a maximum interval to wait
     for a asynchronous I/O request to complete.  If timeout is a NULL
     pointer, aio_waitcomplete() waits indefinitely.  To effect a poll, the
     timeout argument should be non-NULL, pointing to a zero-valued timeval
     structure.

     The aio_waitcomplete() system call also serves the function of
     aio_return(), thus aio_return() should not be called for the control
     block returned in iocbp.

RETURN VALUES
     If an asynchronous I/O request has completed, iocbp is set to point to
     the control block passed with the original request, and the status is
     returned as described in read(2), write(2), or fsync(2).  On failure,
     aio_waitcomplete() returns -1, sets iocbp to NULL and sets errno to indi‐
     cate the error condition.

ERRORS
     The aio_waitcomplete() system call fails if:

     [EINVAL]		The specified time limit is invalid.

     [EAGAIN]		The process has not yet called aio_read() or
			aio_write().

     [EINTR]		A signal was delivered before the timeout expired and
			before any asynchronous I/O requests completed.

     [EWOULDBLOCK]

     [EINPROGRESS]	The specified time limit expired before any asynchro‐
			nous I/O requests completed.

SEE ALSO
     aio_cancel(2), aio_error(2), aio_read(2), aio_return(2), aio_suspend(2),
     aio_write(2), fsync(2), read(2), write(2), aio(4)

STANDARDS
     The aio_waitcomplete() system call is a FreeBSD-specific extension.

HISTORY
     The aio_waitcomplete() system call first appeared in FreeBSD 4.0.

AUTHORS
     The aio_waitcomplete() system call and this manual page were written by
     Christopher M Sedore ⟨cmsedore@maxwell.syr.edu⟩.

BSD			       January 19, 2000				   BSD
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