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FreeBSD 11.0 - man page for aio_return (freebsd section 2)

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