From mboxrd@z Thu Jan  1 00:00:00 1970
To: 9fans@cse.psu.edu
From: andrey mirtchovski <andrey@lanl.gov>
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Subject: [9fans] rudp
Date: Mon, 15 Apr 2002 08:58:23 -0600
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Hi,

I'm trying to use rudp for testing purpouses around here, but I'm a
tad puzzled by the semantics.  All I want to do is fork once and have
one process connect and send a string (or many) to another using the
rudp protocol.

Ip(3) says that listen is not an option, so the only thing I do is
announce() on one side and connect() on the other.  Unfortunately it
doesn't seem to connect at all.  I looked at
/sys/src/cmd/ndb/dnudpserver.c but I think there should be a simpler
way of doing things...

Error reported on connect is:
can't connect: file does not exist(/net/MACHINE/clone)

where MACHINE is the host i'm connecting to (localhost)...

What am I doing wrong and where should I look for more documentation?

Thanx, Andrey

Oh, yes, obligatory code paste: this is how I'm trying to connect.


char *proto = "rudp";
char *port = "5557";
char *host = "ps1";
char adir[40];
char str[40] = "this is a test\n";
char data[8192];

void main() {
	int fd, fd2;


	switch (fork()) {
		case 0:
			sleep(5000);
			if((fd = dial(netmkaddr(proto, host, port), 0, 0, 0)) < 0) {
				perror("can't connect");
				exits("connect");
			}
			write(fd, str, strlen(str));
			exits(0);

		default:
			if((fd2 = announce(netmkaddr("*", proto, port), adir)) < 0) {
				perror("can't announce");
				exits("announce");
			}
			while(read(fd2, data, 8192) > 0)
				print("parent: %s\n", data);

			exits(0);
	}
}