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Break introductory comment into two paragraphs to separate material on the

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garbage collection complications from general discussion of UNIX domain
sockets.

Staticize unp_addsockcred().

Remove XXX comment regarding Giant and v_socket -- v_socket is protected
by the global UNIX domain socket lock.
This commit is contained in:
Robert Watson 2007-02-20 10:50:02 +00:00
parent d24c76d1f5
commit 5b950deabc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=166844
1 changed files with 9 additions and 12 deletions
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21
sys/kern/uipc_usrreq.c
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@ -41,12 +41,13 @@
* connected in pairs (socketpair(2)), or bound/connected to using the file
* system name space. For most purposes, only the receive socket buffer is
* used, as sending on one socket delivers directly to the receive socket
* buffer of a second socket. The implementation is substantially
* complicated by the fact that "ancillary data", such as file descriptors or
* credentials, may be passed across UNIX domain sockets. The potential for
* passing UNIX domain sockets over other UNIX domain sockets requires the
* implementation of a simple garbage collector to find and tear down cycles
* of disconnected sockets.
* buffer of a second socket.
*
* The implementation is substantially complicated by the fact that
* "ancillary data", such as file descriptors or credentials, may be passed
* across UNIX domain sockets. The potential for passing UNIX domain sockets
* over other UNIX domain sockets requires the implementation of a simple
* garbage collector to find and tear down cycles of disconnected sockets.
*
* TODO:
* SEQPACKET, RDM
@ -184,7 +185,7 @@ static void unp_freerights(struct file **, int);
static int unp_internalize(struct mbuf **, struct thread *);
static int unp_listen(struct socket *, struct unpcb *, int,
struct thread *);
struct mbuf *unp_addsockcred(struct thread *, struct mbuf *);
static struct mbuf *unp_addsockcred(struct thread *, struct mbuf *);
/*
* Definitions of protocols supported in the LOCAL domain.
@ -461,10 +462,6 @@ uipc_detach(struct socket *so)
unp->unp_gencnt = ++unp_gencnt;
--unp_count;
if ((vp = unp->unp_vnode) != NULL) {
/*
* XXXRW: should v_socket be frobbed only while holding
* Giant?
*/
unp->unp_vnode->v_socket = NULL;
unp->unp_vnode = NULL;
}
@ -1557,7 +1554,7 @@ unp_internalize(struct mbuf **controlp, struct thread *td)
return (error);
}
struct mbuf *
static struct mbuf *
unp_addsockcred(struct thread *td, struct mbuf *control)
{
struct mbuf *m, *n, *n_prev;