From: Ben Gelb (yrepob@mailit.tunk.net)
Date: Fri Sep 27 2002 - 14:34:11 EEST
When I say 'hangs up' I mean that the user is disconnected from the ax25
link. I should have been more specific. For some reason, the link dies.
I was using fgets to read data. I tried using fread with length of 1024,
2048, and 10000. It was no different.
I doubt the problem is in my program. It basically asks the user for a
line of input, which it them spits back out again. It is simply a test
program. It works fine on the console (yes, I remembered to change the
return character to '\r' when I run it with ax25d).
I am starting to sense there may not be an easy solution to this
problem.
Thanks for answering so quickly!
73 Ben
On Fri, 2002-09-27 at 03:52, Tomi Manninen OH2BNS wrote:
> On 27 Sep 2002, Ben Gelb wrote:
>
> > To output data I am using fopen("php://stdout", "w"); and to read data I
> > am using fopen("php://stdin", "r"); The writing data part works fine,
> > but whenever I attempt to read in data from stdin, ax25d hangs up.
>
> What do you mean by ax25d hanging up?
>
> After spawning a program ax25d doesn't actively participate in the
> communication between the program and the connectee. To spawn a program it
> simply does a fork() followed by an exec(). The programs stdin/out/err are
> redirected to point at the incoming connection socket (dup2()) before the
> exec call.
>
> What you may be seeing is the side effect of AX.25 sockets being
> SOCK_SEQPACKET sockets. This means you always have to read a full packet
> when reading. If you read less than a full packet worth of data, the rest
> of the packet is thrown away. In practise you have no way of knowing how
> big packet there might be waiting in the kernel buffers so you will have
> to do a read() with a buffer "big enough"...
>
> The standard IO libraries do various amounts of buffering if you use stdio
> functions to read so that might explain why something works and something
> else does not.
>
> Then again you might be having some completely another problem with your
> program... :)
>
> --
> Tomi Manninen Internet: mxf.oggpwnp@mx.dy.fi
> OH2BNS AX.25: mexkvne.rkhq@uvoz.cz
> KP20ME04 Amprnet: dratvojf.pkmn@mail.dy.fi
>
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