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c5a4f4eff2
POSIX implies that the user callback function must be executed in clean environment. 2. Use newly introduced pthread stubs in libc.
160 lines
4.1 KiB
C
160 lines
4.1 KiB
C
/*
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* Copyright (c) 2005 David Xu <davidxu@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/syscall.h>
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#include <sys/aio.h>
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#include "namespace.h"
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#include <errno.h>
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#include <stddef.h>
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#include <signal.h>
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#include "sigev_thread.h"
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#include "un-namespace.h"
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__weak_reference(__aio_read, _aio_read);
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__weak_reference(__aio_read, aio_read);
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__weak_reference(__aio_write, _aio_write);
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__weak_reference(__aio_write, aio_write);
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__weak_reference(__aio_return, _aio_return);
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__weak_reference(__aio_return, aio_return);
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__weak_reference(__aio_waitcomplete, _aio_waitcomplete);
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__weak_reference(__aio_waitcomplete, aio_waitcomplete);
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typedef void (*aio_func)(union sigval val, struct aiocb *iocb);
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extern int __sys_aio_read(struct aiocb *iocb);
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extern int __sys_aio_write(struct aiocb *iocb);
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extern int __sys_aio_waitcomplete(struct aiocb **iocbp, struct timespec *timeout);
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extern int __sys_aio_return(struct aiocb *iocb);
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extern int __sys_aio_error(struct aiocb *iocb);
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static void
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aio_dispatch(struct sigev_node *sn)
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{
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aio_func f = sn->sn_func;
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f(sn->sn_value, (struct aiocb *)sn->sn_id);
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}
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static int
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aio_io(struct aiocb *iocb, int (*sysfunc)(struct aiocb *iocb))
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{
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struct sigev_node *sn;
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struct sigevent saved_ev;
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int ret, err;
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if (iocb->aio_sigevent.sigev_notify != SIGEV_THREAD) {
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ret = sysfunc(iocb);
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return (ret);
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}
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if (__sigev_check_init()) {
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/* This might be that thread library is not enabled. */
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errno = EINVAL;
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return (-1);
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}
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sn = __sigev_alloc(SI_ASYNCIO, &iocb->aio_sigevent, NULL, 1);
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if (sn == NULL) {
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errno = EAGAIN;
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return (-1);
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}
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saved_ev = iocb->aio_sigevent;
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sn->sn_id = (sigev_id_t)iocb;
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__sigev_get_sigevent(sn, &iocb->aio_sigevent, sn->sn_id);
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__sigev_list_lock();
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__sigev_register(sn);
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__sigev_list_unlock();
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sn->sn_dispatch = aio_dispatch;
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ret = sysfunc(iocb);
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iocb->aio_sigevent = saved_ev;
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if (ret != 0) {
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err = errno;
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__sigev_list_lock();
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__sigev_delete_node(sn);
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__sigev_list_unlock();
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errno = err;
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}
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return (ret);
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}
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int
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__aio_read(struct aiocb *iocb)
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{
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return aio_io(iocb, &__sys_aio_read);
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}
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int
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__aio_write(struct aiocb *iocb)
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{
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return aio_io(iocb, &__sys_aio_write);
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}
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int
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__aio_waitcomplete(struct aiocb **iocbp, struct timespec *timeout)
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{
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int err;
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int ret = __sys_aio_waitcomplete(iocbp, timeout);
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if (*iocbp) {
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if ((*iocbp)->aio_sigevent.sigev_notify == SIGEV_THREAD) {
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err = errno;
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__sigev_list_lock();
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__sigev_delete(SI_ASYNCIO, (sigev_id_t)(*iocbp));
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__sigev_list_unlock();
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errno = err;
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}
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}
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return (ret);
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}
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int
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__aio_return(struct aiocb *iocb)
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{
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if (iocb->aio_sigevent.sigev_notify == SIGEV_THREAD) {
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if (__sys_aio_error(iocb) == EINPROGRESS)
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return (EINPROGRESS);
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__sigev_list_lock();
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__sigev_delete(SI_ASYNCIO, (sigev_id_t)iocb);
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__sigev_list_unlock();
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}
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return __sys_aio_return(iocb);
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}
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