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#ifndef __LINUX_NET_SCM_H

#define __LINUX_NET_SCM_H

/* Well, we should have at least one descriptor open

 * to accept passed FDs 8)

 */

#define SCM_MAX_FD      (OPEN_MAX-1)

struct scm_fp_list

{

        int             count;

        struct file     *fp[SCM_MAX_FD];

};

struct scm_cookie

{

        struct ucred            creds;          /* Skb credentials      */

        struct scm_fp_list      *fp;            /* Passed files         */

        unsigned long           seq;            /* Connection seqno     */

};

extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);

extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);

extern void __scm_destroy(struct scm_cookie *scm);

extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);

static __inline__ void scm_destroy(struct scm_cookie *scm)

{

        if (scm && scm->fp)

                __scm_destroy(scm);

}

static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,

                               struct scm_cookie *scm)

{

        memset(scm, 0, sizeof(*scm));

        scm->creds.uid = current->uid;

        scm->creds.gid = current->gid;

        scm->creds.pid = current->pid;

        if (msg->msg_controllen <= 0)

                return 0;

        return __scm_send(sock, msg, scm);

}

static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,

                                struct scm_cookie *scm, int flags)

{

        if (!msg->msg_control)

        {

                if (sock->passcred || scm->fp)

                        msg->msg_flags |= MSG_CTRUNC;

                scm_destroy(scm);

                return;

        }

        if (sock->passcred)

                put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);

        if (!scm->fp)

                return;

        scm_detach_fds(msg, scm);

}

#endif /* __LINUX_NET_SCM_H */