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/* Cancel requests associated with given file descriptor.
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Copyright (C) 1997-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* We use an UGLY hack to prevent gcc from finding us cheating. The
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implementation of aio_cancel and aio_cancel64 are identical and so
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we want to avoid code duplication by using aliases. But gcc sees
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the different parameter lists and prints a warning. We define here
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a function so that aio_cancel64 has no prototype. */
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#ifndef aio_cancel
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#define aio_cancel64 XXX
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#include <aio.h>
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/* And undo the hack. */
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#undef aio_cancel64
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#endif
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <aio_misc.h>
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int
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aio_cancel (int fildes, struct aiocb *aiocbp)
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{
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struct requestlist *req = NULL;
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int result = AIO_ALLDONE;
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/* If fildes is invalid, error. */
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if (fcntl (fildes, F_GETFL) < 0)
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{
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__set_errno (EBADF);
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return -1;
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}
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/* Request the mutex. */
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pthread_mutex_lock (&__aio_requests_mutex);
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/* We are asked to cancel a specific AIO request. */
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if (aiocbp != NULL)
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{
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/* If the AIO request is not for this descriptor it has no value
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to look for the request block. */
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if (aiocbp->aio_fildes != fildes)
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{
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pthread_mutex_unlock (&__aio_requests_mutex);
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__set_errno (EINVAL);
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return -1;
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}
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else if (aiocbp->__error_code == EINPROGRESS)
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{
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struct requestlist *last = NULL;
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req = __aio_find_req_fd (fildes);
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if (req == NULL)
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{
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not_found:
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pthread_mutex_unlock (&__aio_requests_mutex);
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__set_errno (EINVAL);
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return -1;
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}
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while (req->aiocbp != (aiocb_union *) aiocbp)
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{
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last = req;
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req = req->next_prio;
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if (req == NULL)
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goto not_found;
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}
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/* Don't remove the entry if a thread is already working on it. */
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if (req->running == allocated)
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{
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result = AIO_NOTCANCELED;
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req = NULL;
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}
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else
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{
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/* We can remove the entry. */
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__aio_remove_request (last, req, 0);
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result = AIO_CANCELED;
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req->next_prio = NULL;
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}
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}
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}
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else
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{
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/* Find the beginning of the list of all requests for this
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desriptor. */
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req = __aio_find_req_fd (fildes);
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/* If any request is worked on by a thread it must be the first.
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So either we can delete all requests or all but the first. */
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if (req != NULL)
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{
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if (req->running == allocated)
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{
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struct requestlist *old = req;
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req = req->next_prio;
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old->next_prio = NULL;
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result = AIO_NOTCANCELED;
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if (req != NULL)
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__aio_remove_request (old, req, 1);
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}
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else
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{
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result = AIO_CANCELED;
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/* We can remove the entry. */
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__aio_remove_request (NULL, req, 1);
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}
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}
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}
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/* Mark requests as canceled and send signal. */
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while (req != NULL)
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{
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struct requestlist *old = req;
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assert (req->running == yes || req->running == queued);
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req->aiocbp->aiocb.__error_code = ECANCELED;
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req->aiocbp->aiocb.__return_value = -1;
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__aio_notify (req);
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req = req->next_prio;
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__aio_free_request (old);
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}
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/* Release the mutex. */
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pthread_mutex_unlock (&__aio_requests_mutex);
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return result;
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}
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#ifndef aio_cancel
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weak_alias (aio_cancel, aio_cancel64)
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#endif
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