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