#ifndef __LINUX_NET_AFUNIX_H#define __LINUX_NET_AFUNIX_H #include <linux/socket.h>#include <linux/un.h>#include <linux/mutex.h>#include <net/sock.h> extern void unix_inflight(struct file *fp);extern void unix_notinflight(struct file *fp);extern void unix_gc(void); #define UNIX_HASH_SIZE	256 extern struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];extern spinlock_t unix_table_lock; extern atomic_t unix_tot_inflight; static inline struct sock *first_unix_socket(int *i){	for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) {		if (!hlist_empty(&unix_socket_table[*i]))			return __sk_head(&unix_socket_table[*i]);	}	return NULL;} static inline struct sock *next_unix_socket(int *i, struct sock *s){	struct sock *next = sk_next(s);	/* More in this chain? */	if (next)		return next;	/* Look for next non-empty chain. */	for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) {		if (!hlist_empty(&unix_socket_table[*i]))			return __sk_head(&unix_socket_table[*i]);	}	return NULL;} #define forall_unix_sockets(i, s) \	for (s = first_unix_socket(&(i)); s; s = next_unix_socket(&(i),(s))) struct unix_address {	atomic_t	refcnt;	int		len;	unsigned	hash;	struct sockaddr_un name[0];}; struct unix_skb_parms {	struct ucred		creds;		/* Skb credentials	*/	struct scm_fp_list	*fp;		/* Passed files		*/}; #define UNIXCB(skb) 	(*(struct unix_skb_parms*)&((skb)->cb))#define UNIXCREDS(skb)	(&UNIXCB((skb)).creds) #define unix_state_rlock(s)	spin_lock(&unix_sk(s)->lock)#define unix_state_runlock(s)	spin_unlock(&unix_sk(s)->lock)#define unix_state_wlock(s)	spin_lock(&unix_sk(s)->lock)#define unix_state_wunlock(s)	spin_unlock(&unix_sk(s)->lock) #ifdef __KERNEL__/* The AF_UNIX socket */struct unix_sock {	/* WARNING: sk has to be the first member */	struct sock		sk;        struct unix_address     *addr;        struct dentry		*dentry;        struct vfsmount		*mnt;	struct mutex		readlock;        struct sock		*peer;        struct sock		*other;        struct sock		*gc_tree;        atomic_t                inflight;        spinlock_t		lock;        wait_queue_head_t       peer_wait;};#define unix_sk(__sk) ((struct unix_sock *)__sk) #ifdef CONFIG_SYSCTLextern int sysctl_unix_max_dgram_qlen;extern void unix_sysctl_register(void);extern void unix_sysctl_unregister(void);#elsestatic inline void unix_sysctl_register(void) {}static inline void unix_sysctl_unregister(void) {}#endif#endif#endif