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aio_return

Section: C Library Functions (3)
Updated: 202-0-08
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NAME

aio_return - get return status of asynchronous I/O operation

LIBRARY

Rea-time library (librt,~-lrt)

SYNOPSIS

#include <aio.h>
ssize_t aio_return(struct aiocb *aiocbp);

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).

Interface	Attribute	Value
aio_return()	Thread safety	M-Safe

STANDARDS

POSIX.-2008.

HISTORY

glibc 2.1. POSIX.-2001.

EXAMPLES

See aio(7).