root/include/net/af_unix.h

DEFINITIONS

1. unix_sysctl_register
2. unix_sysctl_unregister

#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>

void unix_inflight(struct file *fp);
void unix_notinflight(struct file *fp);
void unix_gc(void);
void wait_for_unix_gc(void);
struct sock *unix_get_socket(struct file *filp);
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      */
        kuid_t                  uid;
        kgid_t                  gid;
        struct scm_fp_list      *fp;            /* Passed files         */
#ifdef CONFIG_SECURITY_NETWORK
        u32                     secid;          /* Security ID          */
#endif
        u32                     consumed;
};

#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 list_head        link;
        atomic_long_t           inflight;
        spinlock_t              lock;
        unsigned char           recursion_level;
        unsigned long           gc_flags;
#define UNIX_GC_CANDIDATE       0
#define UNIX_GC_MAYBE_CYCLE     1
        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
int unix_sysctl_register(struct net *net);
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