af_unix.h

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#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);
extern void wait_for_unix_gc(void);
extern struct sock *unix_get_socket(struct file *filp);
extern struct sock *unix_peer_get(struct sock *);

#define UNIX_HASH_SIZE  256
#define UNIX_HASH_BITS  8

extern unsigned int unix_tot_inflight;
extern spinlock_t unix_table_lock;
extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];

struct unix_address {
    atomic_t    refcnt;
    int     len;
    unsigned int    hash;
    struct sockaddr_un name[0];
};

struct unix_skb_parms {
    struct pid      *pid;       /* Skb credentials  */
    const struct cred   *cred;
    struct scm_fp_list  *fp;        /* Passed files     */
#ifdef CONFIG_SECURITY_NETWORK
    u32         secid;      /* Security ID      */
#endif
};

#define UNIXCB(skb)     (*(struct unix_skb_parms *)&((skb)->cb))
#define UNIXSID(skb)    (&UNIXCB((skb)).secid)

#define unix_state_lock(s)  spin_lock(&unix_sk(s)->lock)
#define unix_state_unlock(s)    spin_unlock(&unix_sk(s)->lock)
#define unix_state_lock_nested(s) \
                spin_lock_nested(&unix_sk(s)->lock, \
                SINGLE_DEPTH_NESTING)

/* The AF_UNIX socket */
struct unix_sock {
    /* WARNING: sk has to be the first member */
    struct sock     sk;
    struct unix_address     *addr;
    struct path     path;
    struct mutex        readlock;
    struct sock     *peer;
    struct sock     *other;
    struct list_head    link;
    atomic_long_t       inflight;
    spinlock_t      lock;
    unsigned int        gc_candidate : 1;
    unsigned int        gc_maybe_cycle : 1;
    unsigned char       recursion_level;
    struct socket_wq    peer_wq;
};
#define unix_sk(__sk) ((struct unix_sock *)__sk)

#define peer_wait peer_wq.wait

long unix_inq_len(struct sock *sk);
long unix_outq_len(struct sock *sk);

#ifdef CONFIG_SYSCTL
extern int unix_sysctl_register(struct net *net);
extern void unix_sysctl_unregister(struct net *net);
#else
static inline int unix_sysctl_register(struct net *net) { return 0; }
static inline void unix_sysctl_unregister(struct net *net) {}
#endif
#endif