aio_cancel(3) — Linux manual page


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:

              All requests were successfully canceled.

              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).

              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

       │Interface                             Attribute     Value   │
       │aio_cancel()                          │ Thread safety │ MT-Safe │

CONFORMING TO         top

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

EXAMPLES         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 5.13 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

                               2021-03-22                  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)system_data_types(7)