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socket programming problem

Thomas Heinis
December 16, 2002 14:18
socket programming problem
Message ID:
Dear Fellow Perl Developers,

I have a Perl problem that is becoming more and more annoying. I try to
do the following: I send SNMP messages over a socket and receive the
responses over the very same sockets. I do this by sending, using
send(), and receiving if select(I use select in order to do this
non-blocking) indicates that there is a message waiting to be received
using recv(). Now, my problem is, that select does not really indicate
whether or not a there is a message waiting. In most cases select really
indicates if a message is waiting. But in some cases I can see(by using
snoop) that there should be a message, but select still says that
there's nothing to be received. If I use sysread, to read from the
socket, there is a message waiting there and I can read it. But select
still returns 0. This is quite awkward. Is there something I did
conceptually wrong? Has anybody an idea how to solve this problem? Is
this the right list for that kind of problem?

Any thoughts and suggestions are very much appreciated.


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