aio(4) [freebsd man page]

AIO(4)							   BSD Kernel Interfaces Manual 						    AIO(4)

NAME

     aio -- asynchronous I/O

SYNOPSIS

     To link into the kernel:
     options VFS_AIO

     To load as a kernel loadable module:
	   kldload aio

DESCRIPTION

     The aio facility provides system calls for asynchronous I/O.  It is available both as a kernel option for static inclusion and as a dynamic
     kernel module.

SEE ALSO

     aio_cancel(2), aio_error(2), aio_read(2), aio_return(2), aio_suspend(2), aio_waitcomplete(2), aio_write(2), lio_listio(2), config(8),
     kldload(8), kldunload(8)

HISTORY

     The aio facility appeared as a kernel option in FreeBSD 3.0.  The aio kernel module appeared in FreeBSD 5.0.

BSD
								 October 24, 2002							       BSD

AIO_RETURN(2)						      BSD System Calls Manual						     AIO_RETURN(2)

NAME

     aio_return -- retrieve return status of asynchronous I/O operation (REALTIME)

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <aio.h>

     int
     aio_return(struct aiocb *iocb);

DESCRIPTION

     The aio_return() system call returns the final status of the asynchronous I/O request associated with the structure pointed to by iocb.

     The aio_return() system call should only be called once, to obtain the final status of an asynchronous I/O operation once it has completed
     (aio_error(2) returns something other than EINPROGRESS).

RETURN VALUES

     If the asynchronous I/O request has completed, the status is returned as described in read(2), write(2), or fsync(2).  Otherwise,
     aio_return() returns -1 and sets errno to indicate the error condition.

ERRORS

     The aio_return() system call will fail if:

     [EINVAL]		The iocb argument does not reference a completed asynchronous I/O request.

SEE ALSO

     aio_cancel(2), aio_error(2), aio_suspend(2), aio_waitcomplete(2), aio_write(2), fsync(2), read(2), write(2), aio(4)

STANDARDS

     The aio_return() system call is expected to conform to the IEEE Std 1003.1 (``POSIX.1'') standard.

HISTORY

     The aio_return() system call first appeared in FreeBSD 3.0.

AUTHORS

     This manual page was written by Wes Peters <wes@softweyr.com>.

BSD
								  October 7, 2006							       BSD