AIO_WAITCOMPLETE(2) BSD System Calls Manual AIO_WAITCOMPLETE(2)NAMEaio_waitcomplete — wait for the next completion of an aio request
Standard C Library (libc, -lc)
aio_waitcomplete(struct aiocb **iocbp, struct timespec *timeout);
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
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
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.
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.
The aio_waitcomplete() system call fails if:
[EINVAL] The specified time limit is invalid.
[EAGAIN] The process has not yet called aio_read() or
[EINTR] A signal was delivered before the timeout expired and
before any asynchronous I/O requests completed.
[EINPROGRESS] The specified time limit expired before any asynchro‐
nous I/O requests completed.
SEE ALSOaio_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.
The aio_waitcomplete() system call first appeared in FreeBSD 4.0.
The aio_waitcomplete() system call and this manual page were written by
Christopher M Sedore ⟨email@example.com⟩.
BSD January 19, 2000 BSD