NAME

aio_cancel — cancel an outstanding asynchronous I/O operation (REALTIME)

LIBRARY

POSIX Real-time Library (librt, -lrt)

SYNOPSIS

#include <aio.h>

int
aio_cancel(int fildes, struct aiocb * aiocbp);

DESCRIPTION

The aio_cancel() system call cancels the outstanding asynchronous I/O request for the file descriptor specified in fildes. If aiocbp is specified, only that specific asynchronous I/O request is cancelled.

Normal asynchronous notification occurs for cancelled requests. Requests complete with an error result of ECANCELED.

RETURN VALUES

The aio_cancel() system call returns -1 to indicate an error, or one of the following:

[AIO_CANCELED]

All outstanding requests meeting the criteria specified were cancelled.

[AIO_NOTCANCELED]

Some requests were not cancelled, status for the requests should be checked with aio_error(3).

[AIO_ALLDONE]

All of the requests meeting the criteria have finished.

ERRORS

An error return from aio_cancel() indicates:

[EBADF]

The fildes argument is an invalid file descriptor.

SEE ALSO

aio(3)

STANDARDS

The aio_cancel() system call is expected to conform to the IEEE Std 1003.1-2001 (“POSIX.1”) standard.

HISTORY

The aio_cancel() system call first appeared in NetBSD 5.0.