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Man Pages
AIO_RETURN(2) FreeBSD System Calls Manual AIO_RETURN(2)

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

Standard C Library (libc, -lc)

#include <aio.h>

ssize_t
aio_return(struct aiocb *iocb);

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).

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

The aio_return() system call will fail if:
[]
The iocb argument does not reference a completed asynchronous I/O request.
[]
The I/O operation was submitted with lio_listio(), and the value of the aio_lio_opcode is invalid.

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

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

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

This manual page was written by Wes Peters <wes@softweyr.com>.
January 11, 2021 FreeBSD 13.1-RELEASE

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