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/*

 *  ipc/compat_mq.c

 *    32 bit emulation for POSIX message queue system calls

 *

 *    Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation

 *    Author: Arnd Bergmann <arnd@arndb.de>

 */

#include <linux/compat.h>

#include <linux/fs.h>

#include <linux/kernel.h>

#include <linux/mqueue.h>

#include <linux/syscalls.h>

#include <asm/uaccess.h>

struct compat_mq_attr {

        compat_long_t mq_flags;      /* message queue flags                  */

        compat_long_t mq_maxmsg;     /* maximum number of messages           */

        compat_long_t mq_msgsize;    /* maximum message size                 */

        compat_long_t mq_curmsgs;    /* number of messages currently queued  */

        compat_long_t __reserved[4]; /* ignored for input, zeroed for output */

};

static inline int get_compat_mq_attr(struct mq_attr *attr,

                        const struct compat_mq_attr __user *uattr)

{

        if (!access_ok(VERIFY_READ, uattr, sizeof *uattr))

                return -EFAULT;

        return __get_user(attr->mq_flags, &uattr->mq_flags)

                | __get_user(attr->mq_maxmsg, &uattr->mq_maxmsg)

                | __get_user(attr->mq_msgsize, &uattr->mq_msgsize)

                | __get_user(attr->mq_curmsgs, &uattr->mq_curmsgs);

}

static inline int put_compat_mq_attr(const struct mq_attr *attr,

                        struct compat_mq_attr __user *uattr)

{

        if (clear_user(uattr, sizeof *uattr))

                return -EFAULT;

        return __put_user(attr->mq_flags, &uattr->mq_flags)

                | __put_user(attr->mq_maxmsg, &uattr->mq_maxmsg)

                | __put_user(attr->mq_msgsize, &uattr->mq_msgsize)

                | __put_user(attr->mq_curmsgs, &uattr->mq_curmsgs);

}

asmlinkage long compat_sys_mq_open(const char __user *u_name,

                        int oflag, compat_mode_t mode,

                        struct compat_mq_attr __user *u_attr)

{

        void __user *p = NULL;

        if (u_attr && oflag & O_CREAT) {

                struct mq_attr attr;

                p = compat_alloc_user_space(sizeof(attr));

                if (get_compat_mq_attr(&attr, u_attr) ||

                    copy_to_user(p, &attr, sizeof(attr)))

                        return -EFAULT;

        }

        return sys_mq_open(u_name, oflag, mode, p);

}

static int compat_prepare_timeout(struct timespec __user * *p,

                                  const struct compat_timespec __user *u)

{

        struct timespec ts;

        if (!u) {

                *p = NULL;

                return 0;

        }

        *p = compat_alloc_user_space(sizeof(ts));

        if (get_compat_timespec(&ts, u) || copy_to_user(*p, &ts, sizeof(ts)))

                return -EFAULT;

        return 0;

}

asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes,

                        const char __user *u_msg_ptr,

                        size_t msg_len, unsigned int msg_prio,

                        const struct compat_timespec __user *u_abs_timeout)

{

        struct timespec __user *u_ts;

        if (compat_prepare_timeout(&u_ts, u_abs_timeout))

                return -EFAULT;

        return sys_mq_timedsend(mqdes, u_msg_ptr, msg_len,

                        msg_prio, u_ts);

}

asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes,

                        char __user *u_msg_ptr,

                        size_t msg_len, unsigned int __user *u_msg_prio,

                        const struct compat_timespec __user *u_abs_timeout)

{

        struct timespec __user *u_ts;

        if (compat_prepare_timeout(&u_ts, u_abs_timeout))

                return -EFAULT;

        return sys_mq_timedreceive(mqdes, u_msg_ptr, msg_len,

                        u_msg_prio, u_ts);

}

asmlinkage long compat_sys_mq_notify(mqd_t mqdes,

                        const struct compat_sigevent __user *u_notification)

{

        struct sigevent __user *p = NULL;

        if (u_notification) {

                struct sigevent n;

                p = compat_alloc_user_space(sizeof(*p));

                if (get_compat_sigevent(&n, u_notification))

                        return -EFAULT;

                if (n.sigev_notify == SIGEV_THREAD)

                        n.sigev_value.sival_ptr = compat_ptr(n.sigev_value.sival_int);

                if (copy_to_user(p, &n, sizeof(*p)))

                        return -EFAULT;

        }

        return sys_mq_notify(mqdes, p);

}

asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,

                        const struct compat_mq_attr __user *u_mqstat,

                        struct compat_mq_attr __user *u_omqstat)

{

        struct mq_attr mqstat;

        struct mq_attr __user *p = compat_alloc_user_space(2 * sizeof(*p));

        long ret;

        if (u_mqstat) {

                if (get_compat_mq_attr(&mqstat, u_mqstat) ||

                    copy_to_user(p, &mqstat, sizeof(mqstat)))

                        return -EFAULT;

        }

        ret = sys_mq_getsetattr(mqdes,

                                u_mqstat ? p : NULL,

                                u_omqstat ? p + 1 : NULL);

        if (ret)

                return ret;

        if (u_omqstat) {

                if (copy_from_user(&mqstat, p + 1, sizeof(mqstat)) ||

                    put_compat_mq_attr(&mqstat, u_omqstat))

                        return -EFAULT;

        }

        return 0;

}