scm.h

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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 */