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 ⟨[email protected]⟩.