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33 * @(#)unpcb.h 8.1 (Berkeley) 6/2/93
40 #include <sys/queue.h>
41 #include <sys/ucred.h>
44 * Protocol control block for an active
45 * instance of a UNIX internal protocol.
47 * A socket may be associated with an vnode in the
48 * filesystem. If so, the unp_vnode pointer holds
49 * a reference count to this vnode, which should be irele'd
50 * when the socket goes away.
52 * A socket may be connected to another socket, in which
53 * case the control block of the socket to which it is connected
54 * is given by unp_conn.
56 * A socket may be referenced by a number of sockets (e.g. several
57 * sockets may be connected to a datagram socket.) These sockets
58 * are in a linked list starting with unp_refs, linked through
59 * unp_nextref and null-terminated. Note that a socket may be referenced
60 * by a number of other sockets and may also reference a socket (not
61 * necessarily one which is referencing it). This generates
62 * the need for unp_refs and unp_nextref to be separate fields.
64 * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
65 * so that changes in the sockbuf may be computed to modify
66 * back pressure on the sender accordingly.
68 typedef u_quad_t unp_gen_t;
69 LIST_HEAD(unp_head, unpcb);
72 LIST_ENTRY(unpcb) unp_link; /* glue on list of all PCBs */
73 struct socket *unp_socket; /* pointer back to socket */
74 struct vnode *unp_vnode; /* if associated with file */
75 struct vnode *unp_rvnode; /* root vp for creating process */
76 ino_t unp_ino; /* fake inode number */
77 struct unpcb *unp_conn; /* control block of connected socket */
78 struct unp_head unp_refs; /* referencing socket linked list */
79 LIST_ENTRY(unpcb) unp_reflink; /* link in unp_refs list */
80 struct sockaddr_un *unp_addr; /* bound address of socket */
81 int unp_cc; /* copy of rcv.sb_cc */
82 int unp_mbcnt; /* copy of rcv.sb_mbcnt */
83 unp_gen_t unp_gencnt; /* generation count of this instance */
84 int unp_flags; /* flags */
85 struct xucred unp_peercred; /* peer credentials, if applicable */
91 * UNP_HAVEPC - indicates that the unp_peercred member is filled in
92 * and is really the credentials of the connected peer. This is used
93 * to determine whether the contents should be sent to the user or
96 * UNP_HAVEPCCACHED - indicates that the unp_peercred member is filled
97 * in, but does *not* contain the credentials of the connected peer
98 * (there may not even be a peer). This is set in unp_listen() when
99 * it fills in unp_peercred for later consumption by unp_connect().
101 #define UNP_HAVEPC 0x001
102 #define UNP_HAVEPCCACHED 0x002
104 #define sotounpcb(so) ((struct unpcb *)((so)->so_pcb))
106 /* Hack alert -- this structure depends on <sys/socketvar.h>. */
107 #ifdef _SYS_SOCKETVAR_H_
109 size_t xu_len; /* length of this structure */
110 struct unpcb *xu_unpp; /* to help netstat, fstat */
111 struct unpcb xu_unp; /* our information */
113 struct sockaddr_un xuu_addr; /* our bound address */
116 #define xu_addr xu_au.xuu_addr
118 struct sockaddr_un xuu_caddr; /* their bound address */
121 #define xu_caddr xu_cau.xuu_caddr
122 struct xsocket xu_socket;
123 u_quad_t xu_alignment_hack;
132 #endif /* _SYS_SOCKETVAR_H_ */
134 #endif /* _SYS_UNPCB_H_ */