/*      $NetBSD: linux_mqueue.c,v 1.2 2025/05/17 19:00:56 andvar Exp $  */

/*-
* Copyright (c) 2024 The NetBSD Foundation, Inc.
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_mqueue.c,v 1.2 2025/05/17 19:00:56 andvar Exp $");

#include <sys/param.h>
#include <sys/filedesc.h>
#include <sys/fcntl.h>
#include <sys/mqueue.h>
#include <sys/syscallargs.h>

#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_sched.h>
#include <compat/linux/common/linux_fcntl.h>
#include <compat/linux/common/linux_ipc.h>
#include <compat/linux/common/linux_sem.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_sigevent.h>
#include <compat/linux/common/linux_util.h>
#include <compat/linux/common/linux_mqueue.h>

#include <compat/linux/linux_syscallargs.h>
#include <compat/linux/linux_syscall.h>

static void
linux_to_bsd_mq_attr(const struct linux_mq_attr *lmp, struct mq_attr *bmp)
{
       memset(bmp, 0, sizeof(*bmp));
       bmp->mq_flags = cvtto_bsd_mask(lmp->mq_flags, LINUX_O_NONBLOCK,
           O_NONBLOCK);
       bmp->mq_maxmsg = lmp->mq_maxmsg;
       bmp->mq_msgsize = lmp->mq_msgsize;
       bmp->mq_curmsgs = lmp->mq_curmsgs;
}

static void
bsd_to_linux_mq_attr(const struct mq_attr *bmp, struct linux_mq_attr *lmp)
{
       memset(lmp, 0, sizeof(*lmp));
       lmp->mq_flags = cvtto_linux_mask(bmp->mq_flags, O_NONBLOCK,
           LINUX_O_NONBLOCK);
       lmp->mq_maxmsg = bmp->mq_maxmsg;
       lmp->mq_msgsize = bmp->mq_msgsize;
       lmp->mq_curmsgs = bmp->mq_curmsgs;
}

/* Adapted from sys_mq_open */
int
linux_sys_mq_open(struct lwp *l, const struct linux_sys_mq_open_args *uap,
   register_t *retval)
{
       /* {
               syscallarg(const char *) name;
               syscallarg(int) oflag;
               syscallarg(linux_umode_t) mode;
               syscallarg(struct linux_mq_attr *) attr;
       } */
       struct linux_mq_attr lattr;
       struct mq_attr *attr = NULL, a;
       int error, oflag;

       oflag = linux_to_bsd_ioflags(SCARG(uap, oflag));

       if ((oflag & O_CREAT) != 0 && SCARG(uap, attr) != NULL) {
               error = copyin(SCARG(uap, attr), &lattr, sizeof(lattr));
               if (error)
                       return error;
               linux_to_bsd_mq_attr(&lattr, &a);
               attr = &a;
       }

       return mq_handle_open(l, SCARG(uap, name), oflag,
           (mode_t)SCARG(uap, mode), attr, retval);
}

int
linux_sys_mq_unlink(struct lwp *l, const struct linux_sys_mq_unlink_args *uap,
   register_t *retval)
{
       /* {
               syscallarg(const char *) name;
       } */
       struct sys_mq_unlink_args args;

       SCARG(&args, name) = SCARG(uap, name);

       return sys_mq_unlink(l, &args, retval);
}

/* Adapted from sys___mq_timedsend50 */
int
linux_sys_mq_timedsend(struct lwp *l, const struct linux_sys_mq_timedsend_args *uap,
   register_t *retval)
{
       /* {
               syscallarg(linux_mqd_t) mqdes;
               syscallarg(const char *) msg_ptr;
               syscallarg(size_t) msg_len;
               syscallarg(unsigned int) msg_prio;
               syscallarg(const struct linux_timespec *) abs_timeout;
       } */
       struct linux_timespec lts;
       struct timespec ts, *tsp;
       int error;

       /* Get and convert time value */
       if (SCARG(uap, abs_timeout)) {
               error = copyin(SCARG(uap, abs_timeout), &lts, sizeof(lts));
               if (error)
                       return error;
               linux_to_native_timespec(&ts, &lts);
               tsp = &ts;
       } else {
               tsp = NULL;
       }

       return mq_send1((mqd_t)SCARG(uap, mqdes), SCARG(uap, msg_ptr),
           SCARG(uap, msg_len), SCARG(uap, msg_prio), tsp);
}

/* Adapted from sys___mq_timedreceive50 */
int
linux_sys_mq_timedreceive(struct lwp *l,
   const struct linux_sys_mq_timedreceive_args *uap, register_t *retval)
{
       /* {
               syscallarg(linux_mqd_t) mqdes;
               syscallarg(char *) msg_ptr;
               syscallarg(size_t) msg_len;
               syscallarg(unsigned int *) msg_prio;
               syscallarg(const struct linux_timespec *) abs_timeout;
       }; */
       struct linux_timespec lts;
       struct timespec ts, *tsp;
       ssize_t mlen;
       int error;

       /* Get and convert time value */
       if (SCARG(uap, abs_timeout)) {
               error = copyin(SCARG(uap, abs_timeout), &lts, sizeof(lts));
               if (error)
                       return error;
               linux_to_native_timespec(&ts, &lts);
               tsp = &ts;
       } else {
               tsp = NULL;
       }

       error = mq_recv1((mqd_t)SCARG(uap, mqdes), SCARG(uap, msg_ptr),
           SCARG(uap, msg_len), SCARG(uap, msg_prio), tsp, &mlen);
       if (error == 0)
               *retval = mlen;

       return error;
}

/* Adapted from sys_mq_notify */
int
linux_sys_mq_notify(struct lwp *l, const struct linux_sys_mq_notify_args *uap,
   register_t *retval)
{
       /* {
               syscallarg(linux_mqd_t) mqdes;
               syscallarg(const struct linux_sigevent *) sevp;
       } */
       struct mqueue *mq;
       struct sigevent sig;
       int error;

       if (SCARG(uap, sevp)) {
               /* Get the signal from user-space */
               error = linux_sigevent_copyin(SCARG(uap, sevp), &sig,
                   sizeof(sig));
               if (error)
                       return error;
               if (sig.sigev_notify == SIGEV_SIGNAL &&
                   (sig.sigev_signo <= 0 || sig.sigev_signo >= NSIG))
                       return EINVAL;
       }

       error = mqueue_get((mqd_t)SCARG(uap, mqdes), 0, &mq);
       if (error)
               return error;
       if (SCARG(uap, sevp)) {
               /* Register notification: set the signal and target process */
               if (mq->mq_notify_proc == NULL) {
                       memcpy(&mq->mq_sig_notify, &sig,
                           sizeof(struct sigevent));
                       mq->mq_notify_proc = l->l_proc;
               } else {
                       /* Fail if someone else already registered */
                       error = EBUSY;
               }
       } else {
               /* Unregister the notification */
               mq->mq_notify_proc = NULL;
       }
       mutex_exit(&mq->mq_mtx);
       fd_putfile((int)SCARG(uap, mqdes));

       return error;
}

/* Adapted from sys_mq_getattr */
static int
linux_sys_mq_getattr(struct lwp *l,
   const struct linux_sys_mq_getsetattr_args *uap, register_t *retval)
{
       /* {
               syscallarg(linux_mqd_t) mqdes;
               syscallarg(const struct linux_mq_attr *) newattr;
               syscallarg(struct linux_mq_attr *) oldattr;
       } */
       struct linux_mq_attr lattr;
       struct mq_attr attr;
       struct mqueue *mq;
       int error;

       error = mqueue_get((mqd_t)SCARG(uap, mqdes), 0, &mq);
       if (error)
               return error;
       memcpy(&attr, &mq->mq_attrib, sizeof(struct mq_attr));
       bsd_to_linux_mq_attr(&attr, &lattr);
       mutex_exit(&mq->mq_mtx);
       fd_putfile((int)SCARG(uap, mqdes));

       return copyout(&lattr, SCARG(uap, oldattr), sizeof(lattr));
}

/* Adapted from sys_mq_setattr */
static int
linux_sys_mq_setattr(struct lwp *l,
   const struct linux_sys_mq_getsetattr_args *uap, register_t *retval)
{
       /* {
               syscallarg(linux_mqd_t) mqdes;
               syscallarg(const struct linux_mq_attr *) newattr;
               syscallarg(struct linux_mq_attr *) oldattr;
       } */
       struct linux_mq_attr lattr;
       struct mq_attr attr;
       struct mqueue *mq;
       int error, nonblock;

       error = copyin(SCARG(uap, newattr), &lattr, sizeof(lattr));
       if (error)
               return error;
       linux_to_bsd_mq_attr(&lattr, &attr);
       nonblock = (attr.mq_flags & O_NONBLOCK);

       error = mqueue_get((mqd_t)SCARG(uap, mqdes), 0, &mq);
       if (error)
               return error;

       /* Copy the old attributes, if needed */
       if (SCARG(uap, oldattr)) {
               memcpy(&attr, &mq->mq_attrib, sizeof(struct mq_attr));
               bsd_to_linux_mq_attr(&attr, &lattr);
       }

       /* Ignore everything, except O_NONBLOCK */
       if (nonblock)
               mq->mq_attrib.mq_flags |= O_NONBLOCK;
       else
               mq->mq_attrib.mq_flags &= ~O_NONBLOCK;

       mutex_exit(&mq->mq_mtx);
       fd_putfile((int)SCARG(uap, mqdes));

       /* Copy the data to the user-space. */
       if (SCARG(uap, oldattr))
               return copyout(&lattr, SCARG(uap, oldattr), sizeof(lattr));

       return 0;
}

int
linux_sys_mq_getsetattr(struct lwp *l,
   const struct linux_sys_mq_getsetattr_args *uap, register_t *retval)
{
       /* {
               syscallarg(linux_mqd_t) mqdes;
               syscallarg(const struct linux_mq_attr *) newattr;
               syscallarg(struct linux_mq_attr *) oldattr;
       } */
       if (SCARG(uap, newattr) == NULL)
               return linux_sys_mq_getattr(l, uap, retval);
       return linux_sys_mq_setattr(l, uap, retval);
}

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