NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | ATTRIBUTES | CONFORMING TO | EXAMPLE | SEE ALSO | COLOPHON

AIO_CANCEL(3)             Linux Programmer's Manual            AIO_CANCEL(3)

NAME         top

       aio_cancel - cancel an outstanding asynchronous I/O request

SYNOPSIS         top

       #include <aio.h>

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

       Link with -lrt.

DESCRIPTION         top

       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         top

       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         top

       EBADF  fd is not a valid file descriptor.

       ENOSYS aio_cancel() is not implemented.

VERSIONS         top

       The aio_cancel() function is available since glibc 2.1.

ATTRIBUTES         top

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

       ┌─────────────┬───────────────┬─────────┐
       │Interface    Attribute     Value   │
       ├─────────────┼───────────────┼─────────┤
       │aio_cancel() │ Thread safety │ MT-Safe │
       └─────────────┴───────────────┴─────────┘

CONFORMING TO         top

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

EXAMPLE         top

       See aio(7).

SEE ALSO         top

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

COLOPHON         top

       This page is part of release 4.13 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
       https://www.kernel.org/doc/man-pages/.

                                 2015-03-02                    AIO_CANCEL(3)

Pages that refer to this page: aio_error(3)aio_fsync(3)aio_read(3)aio_return(3)aio_suspend(3)aio_write(3)lio_listio(3)aio(7)