I'm playing with a UDP-based program and I stumbled into something I
can't understand. What I'm doing is:
o Make a SOCK_DGRAM socket
o bind() the socket to INADDR_ANY and port = 0 (port will
be assigned by the system)
o FD_ZERO and FD_SET(sockfd, readset)
o Send some data to "127.0.0.1" at port 18190 with sendto() using
the same socket just created
o Do a select() on the readset
At this stage, select() fires and FD_ISSET indicates something is on
the socket. But I haven't sent anything to that port. Only to port
18190. Trying to revfrom() on the socket returns -1.
On Linux 2.0.34 (glibc2.0.7) and 2.2.14 (glibc2.1.3) the above will
happen. I've also tried this on SunOS 5.6 and NetBSD 1.4.1 which
doesn't show this behaivour. Am I just too tired and missed something
or it this the way it should be?
/Tomas
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