Hi there,
I'm trying to use the gawk 3.1.5 socket communications, tcp protocol
works as expected, but udp crashes at the server side. Using Linux.
#!/usr/bin/gawk -f
# server
BEGIN {
service = "/inet/tcp/8888/0/0"
for (;;) {
printf "%s", strftime("%F.%T")
service |& getline
close(service, "from")
printf " %-15s ", $0
if ($1 == "shutdown") {
print "shutdown" |& service
print ""; exit
}
n = split($0, a, "")
reply = ""
for (i = n; i > 0; i--)
reply = reply a[i]
print reply |& service
close(service, "to")
print reply
}
}
#!/usr/bin/gawk -f
# client
BEGIN {
service = "/inet/tcp/0/localhost/8888"
}
{
print $0 |& service
close(service, "to")
printf "wait for reply: "
service |& getline reply
close(service, "from")
print reply
}
Successful run with tcp client-server opertion:
Server-side:
$ ./server
2008-07-27.10:46:32 this is a test tset a si siht
2008-07-27.10:46:35 shutdown
Client side:
$ echo "this is a test" | client
wait for reply: tset a si siht
$ echo shutdown | client
wait for reply: shutdown
Now, if I change the "/inet/tcp..." to "/inet/udp..." in the 'service'
var on both client and server, I get:
Server-side:
$ ./server
2008-07-27.10:47:08gawk: ./server:8: fatal: can't open two way socket
`/inet/udp/8888/0/0' for input/output (No such file or directory)
Client side:
$ echo "this is a test" | client
wait for reply: ^C
$
Client required Ctrl-C to exit. The server crashed when I hit Enter at
the client screen, so it seemed to be properly blocking on read from the
port. Server line 8 is 'service |& getline'.
Just before sending this post I installed gawk-3.1.6, udp works!
Me happy, I send this anyway to get the problem plus fix into google.
Grant.
--
http://bugsplatter.mine.nu/
