#ifndef __LINUX_NET_SCM_H#define __LINUX_NET_SCM_H #include <linux/limits.h>#include <linux/net.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 void scm_detach_fds_compat(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){	struct task_struct *p = current;	scm->creds.uid = p->uid;	scm->creds.gid = p->gid;	scm->creds.pid = p->tgid;	scm->fp = NULL;	scm->seq = 0;	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 (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)			msg->msg_flags |= MSG_CTRUNC;		scm_destroy(scm);		return;	} 	if (test_bit(SOCK_PASSCRED, &sock->flags))		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 */