/*      $NetBSD: netbsd32_epoll.c,v 1.5 2023/09/02 21:11:54 mrg Exp $   */

/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2007 Roman Divacky
* Copyright (c) 2014 Dmitry Chagin <[email protected]>
*
* 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: netbsd32_epoll.c,v 1.5 2023/09/02 21:11:54 mrg Exp $");

#include <sys/types.h>
#include <sys/epoll.h>
#include <sys/kmem.h>
#include <sys/systm.h>
#include <sys/syscall.h>
#include <sys/syscallargs.h>

#include <compat/netbsd32/netbsd32.h>
#include <compat/netbsd32/netbsd32_conv.h>
#include <compat/netbsd32/netbsd32_syscall.h>
#include <compat/netbsd32/netbsd32_syscallargs.h>

int
netbsd32_epoll_create1(struct lwp *l,
   const struct netbsd32_epoll_create1_args *uap, register_t *retval)
{
       /* {
               syscallarg(int)         flags;
       } */
       struct sys_epoll_create1_args ua;

       NETBSD32TO64_UAP(flags);
       return sys_epoll_create1(l, &ua, retval);
}

int
netbsd32_epoll_ctl(struct lwp *l, const struct netbsd32_epoll_ctl_args *uap,
   register_t *retval)
{
       /* {
               syscallarg(int) epfd;
               syscallarg(int) op;
               syscallarg(int) fd;
               syscallarg(netbsd32_epoll_eventp_t) event;
       } */
       struct epoll_event ee, *eep;
       int error;

       if (SCARG(uap, op) != EPOLL_CTL_DEL) {
               struct netbsd32_epoll_event ee32;

               error = copyin(SCARG_P32(uap, event), &ee32, sizeof(ee32));
               if (error != 0)
                       return error;

               netbsd32_to_epoll_event(&ee32, &ee);
               eep = &ee;
       } else
               eep = NULL;

       return epoll_ctl_common(l, retval, SCARG(uap, epfd), SCARG(uap, op),
           SCARG(uap, fd), eep);
}

int
netbsd32_epoll_pwait2(struct lwp *l,
   const struct netbsd32_epoll_pwait2_args *uap, register_t *retval)
{
       /* {
               syscallarg(int) epfd;
               syscallarg(netbsd32_epoll_eventp_t) events;
               syscallarg(int) maxevents;
               syscallarg(netbsd32_timespecp_t) timeout;
               syscallarg(netbsd32_sigsetp_t) sigmask;
       } */
       struct epoll_event *events;
       struct timespec ts, *tsp;
       sigset_t ss, *ssp;
       int error;
       const int maxevents = SCARG(uap, maxevents);

       if (maxevents <= 0 || maxevents >= EPOLL_MAX_EVENTS)
               return EINVAL;

       if (SCARG_P32(uap, timeout) != NULL) {
               struct netbsd32_timespec ts32;

               error = copyin(SCARG_P32(uap, timeout), &ts32, sizeof(ts32));
               if (error != 0)
                       return error;

               netbsd32_to_timespec(&ts32, &ts);
               tsp = &ts;
       } else
               tsp = NULL;

       if (SCARG_P32(uap, sigmask) != NULL) {
               error = copyin(SCARG_P32(uap, sigmask), &ss, sizeof(ss));
               if (error != 0)
                       return error;

               ssp = &ss;
       } else
               ssp = NULL;

       events = kmem_alloc(maxevents * sizeof(*events), KM_SLEEP);

       error = epoll_wait_common(l, retval, SCARG(uap, epfd), events,
           maxevents, tsp, ssp);
       if (error != 0 || *retval == 0)
               goto out;

       struct netbsd32_epoll_event *events32 =
           kmem_alloc(*retval * sizeof(*events32), KM_SLEEP);

       for (register_t i = 0; i < *retval; i++)
               netbsd32_from_epoll_event(&events[i], &events32[i]);

       error = copyout(events, SCARG_P32(uap, events),
           *retval * sizeof(*events32));

       kmem_free(events32, *retval * sizeof(*events32));

out:
       kmem_free(events, maxevents * sizeof(*events));
       return error;
}