Subject: Re: netstat and PIDs
To: None <current-users@NetBSD.ORG>
From: Christoph Badura <email@example.com>
Date: 09/13/1996 01:16:00
der Mouse writes:
>>> I imagine the kernel must store this info somewhere since it has to
>>> deliver packets to said process - I guess via the descriptor
>> The kernel doesn't store this information, because it doesn't need it
>> during normal operation. The kernel doesn't deliver the packets to a
>> process. The packets get "delivered" to a socketbuffer which hangs
>> [off] the vnode. The first process to read from that vnode [gets]
>> the requested packets.
>Well, there does have to be _some_ link between the two, because a
>process that's blocked in a read or recvfrom on that socket will be
>awakened by arriving data.
But that's just the wait channel, an address.
>But that's probably not useful, because the
>only link between the two is (probably - I haven't specifically looked)
>a sleep/wakeup location pair, which if you wanted to take advatange of
>it would require walking the sleeping process chains.
Right. And you would only catch the processes currently sleeping on
the wait channel, which is actually a private datastructure and there
are a number of them, depending on whether the process reads, writes,
or selects. Not very useful.
Christoph Badura firstname.lastname@example.org
You don't need to quote my .signature. Everyone has seen it by now.
Besides, it doesn't add anything to the current thread.