HardenedBSD/lib/librt/mq.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

284 lines
7.0 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2006 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, 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/mqueue.h>
#include "namespace.h"
#include <errno.h>
#include <pthread.h>
#include <stddef.h>
#include <stdlib.h>
#include <signal.h>
#include "sigev_thread.h"
#include "un-namespace.h"
#include "libc_private.h"
extern int __sys_kmq_notify(int, const struct sigevent *);
extern int __sys_kmq_open(const char *, int, mode_t,
const struct mq_attr *);
extern int __sys_kmq_setattr(int, const struct mq_attr *__restrict,
struct mq_attr *__restrict);
extern ssize_t __sys_kmq_timedreceive(int, char *__restrict, size_t,
unsigned *__restrict, const struct timespec *__restrict);
extern int __sys_kmq_timedsend(int, const char *, size_t, unsigned,
const struct timespec *);
extern int __sys_kmq_unlink(const char *);
extern int __sys_close(int fd);
struct __mq {
int oshandle;
struct sigev_node *node;
};
__weak_reference(__mq_open, mq_open);
__weak_reference(__mq_open, _mq_open);
__weak_reference(__mq_close, mq_close);
__weak_reference(__mq_close, _mq_close);
__weak_reference(__mq_notify, mq_notify);
__weak_reference(__mq_notify, _mq_notify);
__weak_reference(__mq_getattr, mq_getattr);
__weak_reference(__mq_getattr, _mq_getattr);
__weak_reference(__mq_setattr, mq_setattr);
__weak_reference(__mq_setattr, _mq_setattr);
__weak_reference(__mq_timedreceive_cancel, mq_timedreceive);
__weak_reference(__mq_timedreceive, _mq_timedreceive);
__weak_reference(__mq_timedsend_cancel, mq_timedsend);
__weak_reference(__mq_timedsend, _mq_timedsend);
__weak_reference(__mq_unlink, mq_unlink);
__weak_reference(__mq_unlink, _mq_unlink);
__weak_reference(__mq_send_cancel, mq_send);
__weak_reference(__mq_send, _mq_send);
__weak_reference(__mq_receive_cancel, mq_receive);
__weak_reference(__mq_receive, _mq_receive);
mqd_t
__mq_open(const char *name, int oflag, mode_t mode,
const struct mq_attr *attr)
{
struct __mq *mq;
int err;
mq = malloc(sizeof(struct __mq));
if (mq == NULL)
return (NULL);
mq->oshandle = __sys_kmq_open(name, oflag, mode, attr);
if (mq->oshandle != -1) {
mq->node = NULL;
return (mq);
}
err = errno;
free(mq);
errno = err;
return ((mqd_t)-1L);
}
int
__mq_close(mqd_t mqd)
{
int h;
if (mqd->node != NULL) {
__sigev_list_lock();
__sigev_delete_node(mqd->node);
__sigev_list_unlock();
}
h = mqd->oshandle;
free(mqd);
return (__sys_close(h));
}
typedef void (*mq_func)(union sigval val);
static void
mq_dispatch(struct sigev_node *sn)
{
mq_func f = sn->sn_func;
/*
* Check generation before calling user function,
* this should avoid expired notification.
*/
if (sn->sn_gen == sn->sn_info.si_value.sival_int)
f(sn->sn_value);
}
int
__mq_notify(mqd_t mqd, const struct sigevent *evp)
{
struct sigevent ev;
struct sigev_node *sn;
int ret;
if (evp == NULL || evp->sigev_notify != SIGEV_THREAD) {
if (mqd->node != NULL) {
__sigev_list_lock();
__sigev_delete_node(mqd->node);
mqd->node = NULL;
__sigev_list_unlock();
}
return __sys_kmq_notify(mqd->oshandle, evp);
}
if (__sigev_check_init()) {
/*
* Thread library is not enabled.
*/
errno = EINVAL;
return (-1);
}
sn = __sigev_alloc(SI_MESGQ, evp, mqd->node, 1);
if (sn == NULL) {
errno = EAGAIN;
return (-1);
}
sn->sn_id = mqd->oshandle;
sn->sn_dispatch = mq_dispatch;
__sigev_get_sigevent(sn, &ev, sn->sn_gen);
__sigev_list_lock();
if (mqd->node != NULL)
__sigev_delete_node(mqd->node);
mqd->node = sn;
__sigev_register(sn);
ret = __sys_kmq_notify(mqd->oshandle, &ev);
__sigev_list_unlock();
return (ret);
}
int
__mq_getattr(mqd_t mqd, struct mq_attr *attr)
{
return __sys_kmq_setattr(mqd->oshandle, NULL, attr);
}
int
__mq_setattr(mqd_t mqd, const struct mq_attr *newattr, struct mq_attr *oldattr)
{
return __sys_kmq_setattr(mqd->oshandle, newattr, oldattr);
}
ssize_t
__mq_timedreceive(mqd_t mqd, char *buf, size_t len,
unsigned *prio, const struct timespec *timeout)
{
return __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, timeout);
}
ssize_t
__mq_timedreceive_cancel(mqd_t mqd, char *buf, size_t len,
unsigned *prio, const struct timespec *timeout)
{
int ret;
_pthread_cancel_enter(1);
ret = __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, timeout);
_pthread_cancel_leave(ret == -1);
return (ret);
}
ssize_t
__mq_receive(mqd_t mqd, char *buf, size_t len, unsigned *prio)
{
return __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, NULL);
}
ssize_t
__mq_receive_cancel(mqd_t mqd, char *buf, size_t len, unsigned *prio)
{
int ret;
_pthread_cancel_enter(1);
ret = __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, NULL);
_pthread_cancel_leave(ret == -1);
return (ret);
}
ssize_t
__mq_timedsend(mqd_t mqd, char *buf, size_t len,
unsigned prio, const struct timespec *timeout)
{
return __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, timeout);
}
ssize_t
__mq_timedsend_cancel(mqd_t mqd, char *buf, size_t len,
unsigned prio, const struct timespec *timeout)
{
int ret;
_pthread_cancel_enter(1);
ret = __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, timeout);
_pthread_cancel_leave(ret == -1);
return (ret);
}
ssize_t
__mq_send(mqd_t mqd, char *buf, size_t len, unsigned prio)
{
return __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, NULL);
}
ssize_t
__mq_send_cancel(mqd_t mqd, char *buf, size_t len, unsigned prio)
{
int ret;
_pthread_cancel_enter(1);
ret = __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, NULL);
_pthread_cancel_leave(ret == -1);
return (ret);
}
int
__mq_unlink(const char *path)
{
return __sys_kmq_unlink(path);
}
#pragma weak mq_getfd_np
int
mq_getfd_np(mqd_t mqd)
{
return (mqd->oshandle);
}