include/net/af_unix.h

#ifndef __LINUX_NET_AFUNIX_H
#define __LINUX_NET_AFUNIX_H
extern void unix_proto_init(struct net_proto *pro);
extern void unix_inflight(struct file *fp);
extern void unix_notinflight(struct file *fp);
typedef struct sock unix_socket;
extern void unix_gc(void);
extern void wait_for_unix_gc(void);

#define UNIX_HASH_SIZE	256

extern unix_socket *unix_socket_table[UNIX_HASH_SIZE+1];
extern rwlock_t unix_table_lock;

extern atomic_t unix_tot_inflight;

static inline unix_socket *first_unix_socket(int *i)
{
	for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) {
		if (unix_socket_table[*i])
			return unix_socket_table[*i];
	}
	return NULL;
}

static inline unix_socket *next_unix_socket(int *i, unix_socket *s)
{
	/* More in this chain? */
	if (s->next)
		return s->next;
	/* Look for next non-empty chain. */
	for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) {
		if (unix_socket_table[*i])
			return 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)	read_lock(&(s)->protinfo.af_unix.lock)
#define unix_state_runlock(s)	read_unlock(&(s)->protinfo.af_unix.lock)
#define unix_state_wlock(s)	write_lock(&(s)->protinfo.af_unix.lock)
#define unix_state_wunlock(s)	write_unlock(&(s)->protinfo.af_unix.lock)

#endif