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Name

aio_cancel - cancel an outstanding asynchronous I/O request

Synopsis

#include <aio.h>

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

Link with -lrt.

Description

The aio_cancel() function attempts to cancel outstanding asynchronous I/O requests for the file descriptor fd. If aiocbp is NULL, all such requests are canceled. Otherwise, only the request described by the control block pointed to by aiocbp is canceled. (See aio(7) for a description of the aiocb structure.)

Normal asynchronous notification occurs for canceled requests (see aio(7) and sigevent(7) ). The request return status (aio_return(3) ) is set to -1, and the request error status (aio_error(3) ) is set to ECANCELED. The control block of requests that cannot be canceled is not changed.

If the request could not be canceled, then it will terminate in the usual way after performing the I/O operation. (In this case, aio_error(3) will return the status EINPROGRESSS.)

If aiocbp is not NULL, and fd differs from the file descriptor with which the asynchronous operation was initiated, unspecified results occur.

Which operations are cancelable is implementation-defined.

Return Value

The aio_cancel() function returns one of the following values:
AIO_CANCELED
All requests were successfully canceled.
AIO_NOTCANCELED
At least one of the requests specified was not canceled because it was in progress. In this case, one may check the status of individual requests using aio_error(3) .
AIO_ALLDONE
All requests had already been completed before the call.
-1
An error occurred. The cause of the error can be found by inspecting errno.

Errors

EBADF
fd is not a valid file descriptor.
ENOSYS
aio_cancel() is not implemented.

Versions

The aio_cancel() function is available since glibc 2.1.

Conforming to

POSIX.1-2001, POSIX.1-2008.

Example

See aio(7) .

See Also

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

Colophon

This page is part of release 3.78 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.

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