aio_return(3)

NAME#

aio_return - get return status of asynchronous I/O operation

LIBRARY#

Real-time library (librt, -lrt)

SYNOPSIS#

#include <aio.h>

ssize_t aio_return(struct aiocb *\naiocbp\n);

DESCRIPTION#

The aio_return() function returns the final return status for the asynchronous I/O request with control block pointed to by aiocbp. (See aio(7) for a description of the aiocb structure.)

This function should be called only once for any given request, after aio_error(3) returns something other than EINPROGRESS.

RETURN VALUE#

If the asynchronous I/O operation has completed, this function returns the value that would have been returned in case of a synchronous read(2), write(2), fsync(2), or fdatasync(2), call. On error, -1 is returned, and errno is set to indicate the error.

If the asynchronous I/O operation has not yet completed, the return value and effect of aio_return() are undefined.

ERRORS#

EINVAL

aiocbp does not point at a control block for an asynchronous I/O request of which the return status has not been retrieved yet.

ENOSYS

aio_return() is not implemented.

ATTRIBUTES#

For an explanation of the terms used in this section, see attributes(7).

STANDARDS#

POSIX.1-2008.

HISTORY#

glibc 2.1. POSIX.1-2001.

EXAMPLES#

See aio(7).

SEE ALSO#

aio_cancel(3), aio_error(3), aio_fsync(3), aio_read(3), aio_suspend(3), aio_write(3), lio_listio(3), aio(7)