/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 1994-1995 Søren Schmidt
 * 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.
 */

#include <sys/param.h>
#include <sys/limits.h>
#include <sys/msg.h>
#include <sys/proc.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include <sys/syscallsubr.h>
#include <sys/sysent.h>
#include <sys/sysproto.h>

#ifdef COMPAT_LINUX32
#include <machine/../linux32/linux.h>
#include <machine/../linux32/linux32_proto.h>
#else
#include <machine/../linux/linux.h>
#include <machine/../linux/linux_proto.h>
#endif
#include <compat/linux/linux_ipc.h>
#include <compat/linux/linux_ipc64.h>
#include <compat/linux/linux_time.h>
#include <compat/linux/linux_util.h>

/*
 * old, pre 2.4 kernel
 */
struct l_ipc_perm {
        l_key_t         key;
        l_uid16_t       uid;
        l_gid16_t       gid;
        l_uid16_t       cuid;
        l_gid16_t       cgid;
        l_ushort        mode;
        l_ushort        seq;
};

struct l_seminfo {
        l_int semmap;
        l_int semmni;
        l_int semmns;
        l_int semmnu;
        l_int semmsl;
        l_int semopm;
        l_int semume;
        l_int semusz;
        l_int semvmx;
        l_int semaem;
};

struct l_shminfo {
        l_int shmmax;
        l_int shmmin;
        l_int shmmni;
        l_int shmseg;
        l_int shmall;
};

struct l_shm_info {
        l_int used_ids;
        l_ulong shm_tot;  /* total allocated shm */
        l_ulong shm_rss;  /* total resident shm */
        l_ulong shm_swp;  /* total swapped shm */
        l_ulong swap_attempts;
        l_ulong swap_successes;
};

struct l_msginfo {
        l_int msgpool;
        l_int msgmap;
        l_int msgmax;
        l_int msgmnb;
        l_int msgmni;
        l_int msgssz;
        l_int msgtql;
        l_ushort msgseg;
};

static void
bsd_to_linux_shminfo( struct shminfo *bpp, struct l_shminfo64 *lpp)
{

        lpp->shmmax = bpp->shmmax;
        lpp->shmmin = bpp->shmmin;
        lpp->shmmni = bpp->shmmni;
        lpp->shmseg = bpp->shmseg;
        lpp->shmall = bpp->shmall;
}

static void
bsd_to_linux_shm_info( struct shm_info *bpp, struct l_shm_info *lpp)
{

        lpp->used_ids = bpp->used_ids;
        lpp->shm_tot = bpp->shm_tot;
        lpp->shm_rss = bpp->shm_rss;
        lpp->shm_swp = bpp->shm_swp;
        lpp->swap_attempts = bpp->swap_attempts;
        lpp->swap_successes = bpp->swap_successes;
}

static void
linux_to_bsd_ipc_perm(struct l_ipc64_perm *lpp, struct ipc_perm *bpp)
{

        bpp->key = lpp->key;
        bpp->uid = lpp->uid;
        bpp->gid = lpp->gid;
        bpp->cuid = lpp->cuid;
        bpp->cgid = lpp->cgid;
        bpp->mode = lpp->mode;
        bpp->seq = lpp->seq;
}

static void
bsd_to_linux_ipc_perm(struct ipc_perm *bpp, struct l_ipc64_perm *lpp)
{

        lpp->key = bpp->key;
        lpp->uid = bpp->uid;
        lpp->gid = bpp->gid;
        lpp->cuid = bpp->cuid;
        lpp->cgid = bpp->cgid;
        lpp->mode = bpp->mode & (S_IRWXU|S_IRWXG|S_IRWXO);
        lpp->seq = bpp->seq;
}

struct l_msqid_ds {
        struct l_ipc_perm       msg_perm;
        l_uintptr_t             msg_first;      /* first message on queue,unused */
        l_uintptr_t             msg_last;       /* last message in queue,unused */
        l_time_t                msg_stime;      /* last msgsnd time */
        l_time_t                msg_rtime;      /* last msgrcv time */
        l_time_t                msg_ctime;      /* last change time */
        l_ulong                 msg_lcbytes;    /* Reuse junk fields for 32 bit */
        l_ulong                 msg_lqbytes;    /* ditto */
        l_ushort                msg_cbytes;     /* current number of bytes on queue */
        l_ushort                msg_qnum;       /* number of messages in queue */
        l_ushort                msg_qbytes;     /* max number of bytes on queue */
        l_pid_t                 msg_lspid;      /* pid of last msgsnd */
        l_pid_t                 msg_lrpid;      /* last receive pid */
};

struct l_semid_ds {
        struct l_ipc_perm       sem_perm;
        l_time_t                sem_otime;
        l_time_t                sem_ctime;
        l_uintptr_t             sem_base;
        l_uintptr_t             sem_pending;
        l_uintptr_t             sem_pending_last;
        l_uintptr_t             undo;
        l_ushort                sem_nsems;
};

struct l_shmid_ds {
        struct l_ipc_perm       shm_perm;
        l_int                   shm_segsz;
        l_time_t                shm_atime;
        l_time_t                shm_dtime;
        l_time_t                shm_ctime;
        l_ushort                shm_cpid;
        l_ushort                shm_lpid;
        l_short                 shm_nattch;
        l_ushort                private1;
        l_uintptr_t             private2;
        l_uintptr_t             private3;
};

static void
linux_to_bsd_semid_ds(struct l_semid64_ds *lsp, struct semid_ds *bsp)
{

        linux_to_bsd_ipc_perm(&lsp->sem_perm, &bsp->sem_perm);
        bsp->sem_otime = lsp->sem_otime;
        bsp->sem_ctime = lsp->sem_ctime;
        bsp->sem_nsems = lsp->sem_nsems;
}

static void
bsd_to_linux_semid_ds(struct semid_ds *bsp, struct l_semid64_ds *lsp)
{

        bsd_to_linux_ipc_perm(&bsp->sem_perm, &lsp->sem_perm);
        lsp->sem_otime = bsp->sem_otime;
        lsp->sem_ctime = bsp->sem_ctime;
        lsp->sem_nsems = bsp->sem_nsems;
}

static void
linux_to_bsd_shmid_ds(struct l_shmid64_ds *lsp, struct shmid_ds *bsp)
{

        linux_to_bsd_ipc_perm(&lsp->shm_perm, &bsp->shm_perm);
        bsp->shm_segsz = lsp->shm_segsz;
        bsp->shm_lpid = lsp->shm_lpid;
        bsp->shm_cpid = lsp->shm_cpid;
        bsp->shm_nattch = lsp->shm_nattch;
        bsp->shm_atime = lsp->shm_atime;
        bsp->shm_dtime = lsp->shm_dtime;
        bsp->shm_ctime = lsp->shm_ctime;
}

static void
bsd_to_linux_shmid_ds(struct shmid_ds *bsp, struct l_shmid64_ds *lsp)
{

        bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->shm_perm);
        lsp->shm_segsz = bsp->shm_segsz;
        lsp->shm_lpid = bsp->shm_lpid;
        lsp->shm_cpid = bsp->shm_cpid;
        lsp->shm_nattch = bsp->shm_nattch;
        lsp->shm_atime = bsp->shm_atime;
        lsp->shm_dtime = bsp->shm_dtime;
        lsp->shm_ctime = bsp->shm_ctime;
}

static void
linux_to_bsd_msqid_ds(struct l_msqid64_ds *lsp, struct msqid_ds *bsp)
{

        linux_to_bsd_ipc_perm(&lsp->msg_perm, &bsp->msg_perm);
        bsp->msg_cbytes = lsp->msg_cbytes;
        bsp->msg_qnum = lsp->msg_qnum;
        bsp->msg_qbytes = lsp->msg_qbytes;
        bsp->msg_lspid = lsp->msg_lspid;
        bsp->msg_lrpid = lsp->msg_lrpid;
        bsp->msg_stime = lsp->msg_stime;
        bsp->msg_rtime = lsp->msg_rtime;
        bsp->msg_ctime = lsp->msg_ctime;
}

static void
bsd_to_linux_msqid_ds(struct msqid_ds *bsp, struct l_msqid64_ds *lsp)
{

        bsd_to_linux_ipc_perm(&bsp->msg_perm, &lsp->msg_perm);
        lsp->msg_cbytes = bsp->msg_cbytes;
        lsp->msg_qnum = bsp->msg_qnum;
        lsp->msg_qbytes = bsp->msg_qbytes;
        lsp->msg_lspid = bsp->msg_lspid;
        lsp->msg_lrpid = bsp->msg_lrpid;
        lsp->msg_stime = bsp->msg_stime;
        lsp->msg_rtime = bsp->msg_rtime;
        lsp->msg_ctime = bsp->msg_ctime;
}

static int
linux_ipc64_perm_to_ipc_perm(struct l_ipc64_perm *in, struct l_ipc_perm *out)
{

        out->key = in->key;
        out->uid = in->uid;
        out->gid = in->gid;
        out->cuid = in->cuid;
        out->cgid = in->cgid;
        out->mode = in->mode;
        out->seq = in->seq;

        /* Linux does not check overflow */
        if (out->uid != in->uid || out->gid != in->gid ||
            out->cuid != in->cuid || out->cgid != in->cgid ||
            out->mode != in->mode)
                return (EOVERFLOW);
        else
                return (0);
}

static int
linux_msqid_pullup(l_int ver, struct l_msqid64_ds *linux_msqid64, caddr_t uaddr)
{
        struct l_msqid_ds linux_msqid;
        int error;

        if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
                return (copyin(uaddr, linux_msqid64, sizeof(*linux_msqid64)));

        error = copyin(uaddr, &linux_msqid, sizeof(linux_msqid));
        if (error != 0)
                return (error);

        bzero(linux_msqid64, sizeof(*linux_msqid64));
        linux_msqid64->msg_perm.uid = linux_msqid.msg_perm.uid;
        linux_msqid64->msg_perm.gid = linux_msqid.msg_perm.gid;
        linux_msqid64->msg_perm.mode = linux_msqid.msg_perm.mode;
        if (linux_msqid.msg_qbytes == 0)
                linux_msqid64->msg_qbytes = linux_msqid.msg_lqbytes;
        else
                linux_msqid64->msg_qbytes = linux_msqid.msg_qbytes;
        return (0);
}

static int
linux_msqid_pushdown(l_int ver, struct l_msqid64_ds *linux_msqid64, caddr_t uaddr)
{
        struct l_msqid_ds linux_msqid;
        int error;

        if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
                return (copyout(linux_msqid64, uaddr, sizeof(*linux_msqid64)));

        bzero(&linux_msqid, sizeof(linux_msqid));
        error = linux_ipc64_perm_to_ipc_perm(&linux_msqid64->msg_perm,
            &linux_msqid.msg_perm);
        if (error != 0)
                return (error);

        linux_msqid.msg_stime = linux_msqid64->msg_stime;
        linux_msqid.msg_rtime = linux_msqid64->msg_rtime;
        linux_msqid.msg_ctime = linux_msqid64->msg_ctime;

        if (linux_msqid64->msg_cbytes > USHRT_MAX)
                linux_msqid.msg_cbytes = USHRT_MAX;
        else
                linux_msqid.msg_cbytes = linux_msqid64->msg_cbytes;
        linux_msqid.msg_lcbytes = linux_msqid64->msg_cbytes;
        if (linux_msqid64->msg_qnum > USHRT_MAX)
                linux_msqid.msg_qnum = USHRT_MAX;
        else
                linux_msqid.msg_qnum = linux_msqid64->msg_qnum;
        if (linux_msqid64->msg_qbytes > USHRT_MAX)
                linux_msqid.msg_qbytes = USHRT_MAX;
        else
                linux_msqid.msg_qbytes = linux_msqid64->msg_qbytes;
        linux_msqid.msg_lqbytes = linux_msqid64->msg_qbytes;
        linux_msqid.msg_lspid = linux_msqid64->msg_lspid;
        linux_msqid.msg_lrpid = linux_msqid64->msg_lrpid;

        /* Linux does not check overflow */
        if (linux_msqid.msg_stime != linux_msqid64->msg_stime ||
            linux_msqid.msg_rtime != linux_msqid64->msg_rtime ||
            linux_msqid.msg_ctime != linux_msqid64->msg_ctime)
                return (EOVERFLOW);
        return (copyout(&linux_msqid, uaddr, sizeof(linux_msqid)));
}

static int
linux_semid_pullup(l_int ver, struct l_semid64_ds *linux_semid64, caddr_t uaddr)
{
        struct l_semid_ds linux_semid;
        int error;

        if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
                return (copyin(uaddr, linux_semid64, sizeof(*linux_semid64)));
        error = copyin(uaddr, &linux_semid, sizeof(linux_semid));
        if (error != 0)
                return (error);

        bzero(linux_semid64, sizeof(*linux_semid64));
        linux_semid64->sem_perm.uid = linux_semid.sem_perm.uid;
        linux_semid64->sem_perm.gid = linux_semid.sem_perm.gid;
        linux_semid64->sem_perm.mode = linux_semid.sem_perm.mode;
        return (0);
}

static int
linux_semid_pushdown(l_int ver, struct l_semid64_ds *linux_semid64, caddr_t uaddr)
{
        struct l_semid_ds linux_semid;
        int error;

        if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
                return (copyout(linux_semid64, uaddr, sizeof(*linux_semid64)));

        bzero(&linux_semid, sizeof(linux_semid));
                error = linux_ipc64_perm_to_ipc_perm(&linux_semid64->sem_perm,
            &linux_semid.sem_perm);
        if (error != 0)
                return (error);

        linux_semid.sem_otime = linux_semid64->sem_otime;
        linux_semid.sem_ctime = linux_semid64->sem_ctime;
        linux_semid.sem_nsems = linux_semid64->sem_nsems;

        /* Linux does not check overflow */
        if (linux_semid.sem_otime != linux_semid64->sem_otime ||
            linux_semid.sem_ctime != linux_semid64->sem_ctime ||
            linux_semid.sem_nsems != linux_semid64->sem_nsems)
                return (EOVERFLOW);
        return (copyout(&linux_semid, uaddr, sizeof(linux_semid)));
}

static int
linux_shmid_pullup(l_int ver, struct l_shmid64_ds *linux_shmid64, caddr_t uaddr)
{
        struct l_shmid_ds linux_shmid;
        int error;

        if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
                return (copyin(uaddr, linux_shmid64, sizeof(*linux_shmid64)));

        error = copyin(uaddr, &linux_shmid, sizeof(linux_shmid));
        if (error != 0)
                return (error);

        bzero(linux_shmid64, sizeof(*linux_shmid64));
        linux_shmid64->shm_perm.uid = linux_shmid.shm_perm.uid;
        linux_shmid64->shm_perm.gid = linux_shmid.shm_perm.gid;
        linux_shmid64->shm_perm.mode = linux_shmid.shm_perm.mode;
        return (0);
}

static int
linux_shmid_pushdown(l_int ver, struct l_shmid64_ds *linux_shmid64, caddr_t uaddr)
{
        struct l_shmid_ds linux_shmid;
        int error;

        if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
                return (copyout(linux_shmid64, uaddr, sizeof(*linux_shmid64)));

        bzero(&linux_shmid, sizeof(linux_shmid));
        error = linux_ipc64_perm_to_ipc_perm(&linux_shmid64->shm_perm,
            &linux_shmid.shm_perm);
        if (error != 0)
                return (error);

        linux_shmid.shm_segsz = linux_shmid64->shm_segsz;
        linux_shmid.shm_atime = linux_shmid64->shm_atime;
        linux_shmid.shm_dtime = linux_shmid64->shm_dtime;
        linux_shmid.shm_ctime = linux_shmid64->shm_ctime;
        linux_shmid.shm_cpid = linux_shmid64->shm_cpid;
        linux_shmid.shm_lpid = linux_shmid64->shm_lpid;
        linux_shmid.shm_nattch = linux_shmid64->shm_nattch;

        /* Linux does not check overflow */
        if (linux_shmid.shm_segsz != linux_shmid64->shm_segsz ||
            linux_shmid.shm_atime != linux_shmid64->shm_atime ||
            linux_shmid.shm_dtime != linux_shmid64->shm_dtime ||
            linux_shmid.shm_ctime != linux_shmid64->shm_ctime ||
            linux_shmid.shm_cpid != linux_shmid64->shm_cpid ||
            linux_shmid.shm_lpid != linux_shmid64->shm_lpid ||
            linux_shmid.shm_nattch != linux_shmid64->shm_nattch)
                return (EOVERFLOW);
        return (copyout(&linux_shmid, uaddr, sizeof(linux_shmid)));
}

static int
linux_shminfo_pushdown(l_int ver, struct l_shminfo64 *linux_shminfo64,
    caddr_t uaddr)
{
        struct l_shminfo linux_shminfo;

        if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
                return (copyout(linux_shminfo64, uaddr,
                    sizeof(*linux_shminfo64)));

        bzero(&linux_shminfo, sizeof(linux_shminfo));
        linux_shminfo.shmmax = linux_shminfo64->shmmax;
        linux_shminfo.shmmin = linux_shminfo64->shmmin;
        linux_shminfo.shmmni = linux_shminfo64->shmmni;
        linux_shminfo.shmseg = linux_shminfo64->shmseg;
        linux_shminfo.shmall = linux_shminfo64->shmall;
        return (copyout(&linux_shminfo, uaddr, sizeof(linux_shminfo)));
}

#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
int
linux_semtimedop_time64(struct thread *td, struct linux_semtimedop_time64_args *args)
{
        struct timespec ts, *tsa;
        int error;

        if (args->timeout) {
                error = linux_get_timespec64(&ts, args->timeout);
                if (error != 0)
                        return (error);
                tsa = &ts;
        } else
                tsa = NULL;

        return (kern_semop(td, args->semid, PTRIN(args->tsops),
            args->nsops, tsa));
}
#endif /* __i386__) || (__amd64__ && COMPAT_LINUX32) */

int
linux_semtimedop(struct thread *td, struct linux_semtimedop_args *args)
{
        struct timespec ts, *tsa;
        int error;

        if (args->timeout) {
                error = linux_get_timespec(&ts, args->timeout);
                if (error != 0)
                        return (error);
                tsa = &ts;
        } else
                tsa = NULL;

        return (kern_semop(td, args->semid, PTRIN(args->tsops),
            args->nsops, tsa));
}

int
linux_semget(struct thread *td, struct linux_semget_args *args)
{
        struct semget_args bsd_args = {
                .key = args->key,
                .nsems = args->nsems,
                .semflg = args->semflg
        };

        if (args->nsems < 0)
                return (EINVAL);
        return (sys_semget(td, &bsd_args));
}

int
linux_semctl(struct thread *td, struct linux_semctl_args *args)
{
        struct l_semid64_ds linux_semid64;
        struct l_seminfo linux_seminfo;
        struct semid_ds semid;
        union semun semun;
        register_t rval;
        int cmd, error;

        memset(&linux_seminfo, 0, sizeof(linux_seminfo));
        memset(&linux_semid64, 0, sizeof(linux_semid64));

        switch (args->cmd & ~LINUX_IPC_64) {
        case LINUX_IPC_RMID:
                cmd = IPC_RMID;
                break;
        case LINUX_GETNCNT:
                cmd = GETNCNT;
                break;
        case LINUX_GETPID:
                cmd = GETPID;
                break;
        case LINUX_GETVAL:
                cmd = GETVAL;
                break;
        case LINUX_GETZCNT:
                cmd = GETZCNT;
                break;
        case LINUX_SETVAL:
                cmd = SETVAL;
                semun.val = args->arg.val;
                break;
        case LINUX_IPC_SET:
                cmd = IPC_SET;
                error = linux_semid_pullup(args->cmd & LINUX_IPC_64,
                    &linux_semid64, PTRIN(args->arg.buf));
                if (error != 0)
                        return (error);
                linux_to_bsd_semid_ds(&linux_semid64, &semid);
                semun.buf = &semid;
                return (kern_semctl(td, args->semid, args->semnum, cmd, &semun,
                    td->td_retval));
        case LINUX_IPC_STAT:
                cmd = IPC_STAT;
                semun.buf = &semid;
                error = kern_semctl(td, args->semid, args->semnum, cmd, &semun,
                    &rval);
                if (error != 0)
                        return (error);
                bsd_to_linux_semid_ds(&semid, &linux_semid64);
                return (linux_semid_pushdown(args->cmd & LINUX_IPC_64,
                    &linux_semid64, PTRIN(args->arg.buf)));
        case LINUX_SEM_STAT:
                cmd = SEM_STAT;
                semun.buf = &semid;
                error = kern_semctl(td, args->semid, args->semnum, cmd, &semun,
                    &rval);
                if (error != 0)
                        return (error);
                bsd_to_linux_semid_ds(&semid, &linux_semid64);
                error = linux_semid_pushdown(args->cmd & LINUX_IPC_64,
                    &linux_semid64, PTRIN(args->arg.buf));
                if (error == 0)
                        td->td_retval[0] = rval;
                return (error);
        case LINUX_IPC_INFO:
        case LINUX_SEM_INFO:
                bcopy(&seminfo, &linux_seminfo.semmni, sizeof(linux_seminfo) -
                    sizeof(linux_seminfo.semmap) );
                /*
                 * Linux does not use the semmap field but populates it with
                 * the defined value from SEMMAP, which really is redefined to
                 * SEMMNS, which they define as SEMMNI * SEMMSL.  Try to
                 * simulate this returning our dynamic semmns value.
                 */
                linux_seminfo.semmap = linux_seminfo.semmns;
/* XXX BSD equivalent?
#define used_semids 10
#define used_sems 10
                linux_seminfo.semusz = used_semids;
                linux_seminfo.semaem = used_sems;
*/
                error = copyout(&linux_seminfo,
                    PTRIN(args->arg.buf), sizeof(linux_seminfo));
                if (error != 0)
                        return (error);
                /*
                 * TODO: Linux return the last assigned id, not the semmni.
                 */
                td->td_retval[0] = seminfo.semmni;
                return (0);
        case LINUX_GETALL:
                cmd = GETALL;
                semun.array = PTRIN(args->arg.array);
                break;
        case LINUX_SETALL:
                cmd = SETALL;
                semun.array = PTRIN(args->arg.array);
                break;
        default:
                linux_msg(td, "ipc type %d is not implemented",
                  args->cmd & ~LINUX_IPC_64);
                return (EINVAL);
        }
        return (kern_semctl(td, args->semid, args->semnum, cmd, &semun,
            td->td_retval));
}

int
linux_msgsnd(struct thread *td, struct linux_msgsnd_args *args)
{
        const void *msgp;
        long mtype;
        l_long lmtype;
        int error;

        if ((l_long)args->msgsz < 0 || args->msgsz > (l_long)msginfo.msgmax)
                return (EINVAL);
        msgp = PTRIN(args->msgp);
        if ((error = copyin(msgp, &lmtype, sizeof(lmtype))) != 0)
                return (error);
        mtype = (long)lmtype;
        return (kern_msgsnd(td, args->msqid,
            (const char *)msgp + sizeof(lmtype),
            args->msgsz, args->msgflg, mtype));
}

int
linux_msgrcv(struct thread *td, struct linux_msgrcv_args *args)
{
        void *msgp;
        long mtype;
        l_long lmtype;
        int error;

        if ((l_long)args->msgsz < 0 || args->msgsz > (l_long)msginfo.msgmax)
                return (EINVAL);
        msgp = PTRIN(args->msgp);
        if ((error = kern_msgrcv(td, args->msqid,
            (char *)msgp + sizeof(lmtype), args->msgsz,
            args->msgtyp, args->msgflg, &mtype)) != 0)
                return (error);
        lmtype = (l_long)mtype;
        return (copyout(&lmtype, msgp, sizeof(lmtype)));
}

int
linux_msgget(struct thread *td, struct linux_msgget_args *args)
{
        struct msgget_args bsd_args = {
                .key = args->key,
                .msgflg = args->msgflg
        };

        return (sys_msgget(td, &bsd_args));
}

int
linux_msgctl(struct thread *td, struct linux_msgctl_args *args)
{
        int error, bsd_cmd;
        struct l_msqid64_ds linux_msqid64;
        struct msqid_ds bsd_msqid;

        memset(&linux_msqid64, 0, sizeof(linux_msqid64));

        bsd_cmd = args->cmd & ~LINUX_IPC_64;
        switch (bsd_cmd) {
        case LINUX_IPC_INFO:
        case LINUX_MSG_INFO: {
                struct l_msginfo linux_msginfo;

                memset(&linux_msginfo, 0, sizeof(linux_msginfo));
                /*
                 * XXX MSG_INFO uses the same data structure but returns different
                 * dynamic counters in msgpool, msgmap, and msgtql fields.
                 */
                linux_msginfo.msgpool = (long)msginfo.msgmni *
                    (long)msginfo.msgmnb / 1024L;       /* XXX MSG_INFO. */
                linux_msginfo.msgmap = msginfo.msgmnb;  /* XXX MSG_INFO. */
                linux_msginfo.msgmax = msginfo.msgmax;
                linux_msginfo.msgmnb = msginfo.msgmnb;
                linux_msginfo.msgmni = msginfo.msgmni;
                linux_msginfo.msgssz = msginfo.msgssz;
                linux_msginfo.msgtql = msginfo.msgtql;  /* XXX MSG_INFO. */
                linux_msginfo.msgseg = msginfo.msgseg;
                error = copyout(&linux_msginfo, PTRIN(args->buf),
                    sizeof(linux_msginfo));
                if (error == 0)
                    td->td_retval[0] = msginfo.msgmni;  /* XXX */

                return (error);
        }

        /*
         * TODO: implement this
         * case LINUX_MSG_STAT:
         */
        case LINUX_IPC_STAT:
                /* NOTHING */
                break;

        case LINUX_IPC_SET:
                error = linux_msqid_pullup(args->cmd & LINUX_IPC_64,
                    &linux_msqid64, PTRIN(args->buf));
                if (error != 0)
                        return (error);
                linux_to_bsd_msqid_ds(&linux_msqid64, &bsd_msqid);
                break;

        case LINUX_IPC_RMID:
                /* NOTHING */
                break;

        default:
                return (EINVAL);
                break;
        }

        error = kern_msgctl(td, args->msqid, bsd_cmd, &bsd_msqid);
        if (error != 0) {
                if (bsd_cmd == LINUX_IPC_RMID && error == EACCES)
                        return (EPERM);
                if (bsd_cmd != LINUX_IPC_RMID || error != EINVAL)
                        return (error);
        }

        if (bsd_cmd == LINUX_IPC_STAT) {
                bsd_to_linux_msqid_ds(&bsd_msqid, &linux_msqid64);
                return (linux_msqid_pushdown(args->cmd & LINUX_IPC_64,
                    &linux_msqid64, PTRIN(args->buf)));
        }

        return (0);
}

int
linux_shmat(struct thread *td, struct linux_shmat_args *args)
{
        struct shmat_args bsd_args = {
                .shmid = args->shmid,
                .shmaddr = PTRIN(args->shmaddr),
                .shmflg = args->shmflg
        };

        return (sys_shmat(td, &bsd_args));
}

int
linux_shmdt(struct thread *td, struct linux_shmdt_args *args)
{
        struct shmdt_args bsd_args = {
                .shmaddr = PTRIN(args->shmaddr)
        };

        return (sys_shmdt(td, &bsd_args));
}

int
linux_shmget(struct thread *td, struct linux_shmget_args *args)
{
        struct shmget_args bsd_args = {
                .key = args->key,
                .size = args->size,
                .shmflg = args->shmflg
        };

        return (sys_shmget(td, &bsd_args));
}

int
linux_shmctl(struct thread *td, struct linux_shmctl_args *args)
{
        struct l_shmid64_ds linux_shmid64;
        struct l_shminfo64 linux_shminfo64;
        struct l_shm_info linux_shm_info;
        struct shmid_ds bsd_shmid;
        int error;

        memset(&linux_shm_info, 0, sizeof(linux_shm_info));
        memset(&linux_shmid64, 0, sizeof(linux_shmid64));
        memset(&linux_shminfo64, 0, sizeof(linux_shminfo64));

        switch (args->cmd & ~LINUX_IPC_64) {
        case LINUX_IPC_INFO: {
                struct shminfo bsd_shminfo;

                /* Perform shmctl wanting removed segments lookup */
                error = kern_shmctl(td, args->shmid, IPC_INFO,
                    (void *)&bsd_shminfo, NULL);
                if (error != 0)
                        return (error);

                bsd_to_linux_shminfo(&bsd_shminfo, &linux_shminfo64);

                return (linux_shminfo_pushdown(args->cmd & LINUX_IPC_64,
                    &linux_shminfo64, PTRIN(args->buf)));
        }

        case LINUX_SHM_INFO: {
                struct shm_info bsd_shm_info;

                /* Perform shmctl wanting removed segments lookup */
                error = kern_shmctl(td, args->shmid, SHM_INFO,
                    (void *)&bsd_shm_info, NULL);
                if (error != 0)
                        return (error);

                bsd_to_linux_shm_info(&bsd_shm_info, &linux_shm_info);

                return (copyout(&linux_shm_info, PTRIN(args->buf),
                    sizeof(struct l_shm_info)));
        }

        case LINUX_IPC_STAT:
                /* Perform shmctl wanting removed segments lookup */
                error = kern_shmctl(td, args->shmid, IPC_STAT,
                    (void *)&bsd_shmid, NULL);
                if (error != 0)
                        return (error);

                bsd_to_linux_shmid_ds(&bsd_shmid, &linux_shmid64);

                return (linux_shmid_pushdown(args->cmd & LINUX_IPC_64,
                    &linux_shmid64, PTRIN(args->buf)));

        case LINUX_SHM_STAT:
                /* Perform shmctl wanting removed segments lookup */
                error = kern_shmctl(td, args->shmid, IPC_STAT,
                    (void *)&bsd_shmid, NULL);
                if (error != 0)
                        return (error);

                bsd_to_linux_shmid_ds(&bsd_shmid, &linux_shmid64);

                return (linux_shmid_pushdown(args->cmd & LINUX_IPC_64,
                    &linux_shmid64, PTRIN(args->buf)));

        case LINUX_IPC_SET:
                error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
                    &linux_shmid64, PTRIN(args->buf));
                if (error != 0)
                        return (error);

                linux_to_bsd_shmid_ds(&linux_shmid64, &bsd_shmid);

                /* Perform shmctl wanting removed segments lookup */
                return (kern_shmctl(td, args->shmid, IPC_SET,
                    (void *)&bsd_shmid, NULL));

        case LINUX_IPC_RMID: {
                void *buf;

                if (args->buf == 0)
                        buf = NULL;
                else {
                        error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
                            &linux_shmid64, PTRIN(args->buf));
                        if (error != 0)
                                return (error);
                        linux_to_bsd_shmid_ds(&linux_shmid64, &bsd_shmid);
                        buf = (void *)&bsd_shmid;
                }
                return (kern_shmctl(td, args->shmid, IPC_RMID, buf, NULL));
        }

        case LINUX_SHM_LOCK:
                /* FALLTHROUGH */
        case LINUX_SHM_UNLOCK:
                /* FALLTHROUGH */
        default:
                linux_msg(td, "ipc type %d not implemented",
                    args->cmd & ~LINUX_IPC_64);
                return (EINVAL);
        }
}

MODULE_DEPEND(linux, sysvmsg, 1, 1, 1);
MODULE_DEPEND(linux, sysvsem, 1, 1, 1);
MODULE_DEPEND(linux, sysvshm, 1, 1, 1);