freebsd-src/sys/netgraph/ng_socketvar.h
Gleb Smirnoff 8afe16d57b In the splnet times, netgraph was functional and synchronous. Nowadays,
an item may be queued and processed later. While this is OK for mbufs,
this is a problem for control messages.

In the framework:
- Add optional callback function pointer to an item. When item gets
  applied the callback is executed from ng_apply_item().
- Add new flag NG_PROGRESS. If this flag is supplied, then return
  EINPROGRESS instead of 0 in case if item failed to deliver
  synchronously and was queued.
- Honor NG_PROGRESS in ng_snd_item().

In ng_socket:
- When userland sends control message add callback to the item.
- If ng_snd_item() returns EINPROGRESS, then sleep.

This change fixes possible races in ngctl(8) scripts.

Reviewed by:	julian
Approved by:	re (scottl)
2005-07-05 17:35:20 +00:00

69 lines
2.8 KiB
C

/*
* netgraph.h
*/
/*-
* Copyright (c) 1996-1999 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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*
* Author: Julian Elischer <julian@freebsd.org>
*
* $FreeBSD$
* $Whistle: ng_socketvar.h,v 1.1 1999/01/20 21:35:39 archie Exp $
*/
#ifndef _NETGRAPH_NG_SOCKETVAR_H_
#define _NETGRAPH_NG_SOCKETVAR_H_
/* Netgraph protocol control block for each socket */
struct ngpcb {
struct socket *ng_socket; /* the socket */
struct ngsock *sockdata; /* netgraph info */
LIST_ENTRY(ngpcb) socks; /* linked list of sockets */
int type; /* NG_CONTROL or NG_DATA */
};
/* Per-node private data */
struct ngsock {
struct ng_node *node; /* the associated netgraph node */
struct ngpcb *datasock; /* optional data socket */
struct ngpcb *ctlsock; /* optional control socket */
int flags;
int refs;
struct mtx mtx; /* mtx to wait on */
int error; /* place to store error */
};
#define NGS_FLAG_NOLINGER 1 /* close with last hook */
#endif /* _NETGRAPH_NG_SOCKETVAR_H_ */