AIO_CANCEL(3) | Library Functions Manual | AIO_CANCEL(3)

# 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.

May 17, 2010 | NetBSD 9.2