Date: Mon, 14 May 2001 23:24:07 +0400 (MSD) From: "Roman V. Palagin" <romanp@unshadow.net> To: <freebsd-hackers@freebsd.org> Subject: How to transfer data from netgraph node to user program? Message-ID: <Pine.SOL.4.33.0105142254130.3484-100000@abyss.unshadow.net>
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Hello!
I've wrote netgraph node which collects some information from network. Now
I want to transfer collected data into user program. I've NGM_XXX_STAT
message which initiates data transfer and program which uses libnetgraph
to communicate with node. When I send NGM_XXX_STAT message node must
starts data transfer but I don't know exactly how much data should be
transfered so I can't use synhronous reply. Also, NgSendMsg(...,
NGM_XXX_STAT, ...) doesn't return until handler of NGM_XXX_STAT is
finished, so I can't use ng_send_msg() in NGM_XXX_STAT handler - nobody
will read sended messages and I finished up with "No buffer space
available".
The question is: how I can initiate smth. like asynchronous reply (so I
can get data via NgRecvMsg later in my prgram)? Or I'm going wrong way and
should use another scheme for data transfer? Data size ranges from 10Kb to
500Kb.
- Roman
---
Any opinions in this posting are my own and not those of my present
or previous employers.
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