root/include/net/af_unix.h

INCLUDED FROM

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>

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 unsigned int unix_tot_inflight;

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         */
#ifdef CONFIG_SECURITY_NETWORK
        u32                     secid;          /* Security ID          */
#endif
};

#define UNIXCB(skb)     (*(struct unix_skb_parms*)&((skb)->cb))
#define UNIXCREDS(skb)  (&UNIXCB((skb)).creds)
#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)

#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 list_head        link;
        atomic_long_t           inflight;
        spinlock_t              lock;
        unsigned int            gc_candidate : 1;
        wait_queue_head_t       peer_wait;
};
#define unix_sk(__sk) ((struct unix_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
#endif