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Add additional comments to the top of the UNIX domain socket implementation

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providing some high level pointers regarding the implementation.
This commit is contained in:
Robert Watson 2006-07-23 20:06:45 +00:00
parent 4b19d603c4
commit f23929fbc5
1 changed files with 18 additions and 0 deletions
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18
sys/kern/uipc_usrreq.c
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@ -31,6 +31,24 @@
* From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
*/
/*
* UNIX Domain (Local) Sockets
*
* This is an implementation of UNIX (local) domain sockets. Each socket has
* an associated struct unpcb (UNIX protocol control block). Stream sockets
* may be connected to 0 or 1 other socket. Datagram sockets may be
* connected to 0, 1, or many other sockets. Sockets may be created and
* 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
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");