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



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.

       Normal asynchronous notification occurs for canceled requests.  The request return status is set to -1, and the
       request error status is set to ECANCELED.  The control block  of  requests  that  cannot  be  canceled  is  not
       changed.

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

       Which operations are cancellable is implementation-defined.

RETURN VALUE
       This function returns AIO_CANCELED if all requests were successfully canceled.  It returns AIO_NOTCANCELED when
       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).  This function returns AIO_ALLDONE when all requests  had
       been  completed  already  before this call.  When some error occurs, -1 is returned, and errno is set appropri-
       ately.

ERRORS
       EBADF  fd is not a valid file descriptor.

CONFORMING TO
       POSIX.1-2001.

SEE ALSO
       aio_error(3), aio_fsync(3), aio_read(3), aio_return(3), aio_suspend(3), aio_write(3)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



                                  2003-11-14                     AIO_CANCEL(3)