aio(4) [osx man page]

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

NAME

     aio -- asynchronous I/O

DESCRIPTION

     The aio facility provides system calls for asynchronous I/O.

SEE ALSO

     aio_cancel(2), aio_error(2), aio_read(2), aio_return(2), aio_suspend(2), aio_write(2), lio_listio(2)

HISTORY

     The aio facility appeared in FreeBSD 3.0.

BSD
								 February 16, 2006							       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>

     ssize_t
     aio_return(struct aiocb *aiocbp);

DESCRIPTION

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

     The aio_return() system call should only be called once, to obtain the final status of an asynchronous I/O operation (once aio_error(2)
     returns something other than EINPROGRESS) and to clean up system resources. However, if aio_return() is not called at all, aio(4) will leak
     resources.

RETURN VALUES

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

ERRORS

     The aio_return() system call will fail if:

     [EINVAL]		The aiocbp argument does not reference an outstanding asynchronous I/O request.

     [EINPROGRESS]	The asynchronous I/O request is still in progress.

LEGACY SYNOPSIS

     #include <aio.h>

     int
     aio_return(struct aiocb *aiocbp);

     The type of the return value has changed.

SEE ALSO

     aio_cancel(2), aio_error(2), aio_suspend(2), aio_write(2), fsync(2), read(2), write(2), aio(4), compat(5)

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
								September 26, 2008							       BSD