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mirror of https://git.FreeBSD.org/src.git synced 2024-12-28 11:57:28 +00:00
freebsd/lib/librt/aio.c
Pedro F. Giffuni 5e53a4f90f lib: further adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-26 02:00:33 +00:00

233 lines
5.6 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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);
}