Date: Tue, 31 Jul 2001 15:54:35 +0400 (MSK) From: Grigory Kljuchnikov <grn@ispras.ru> To: <freebsd-questions@FreeBSD.ORG> Subject: How can I get udp socket error status Message-ID: <Pine.GSO.4.33.0107311548400.28297-100000@gate.ispras.ru>
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Hello,
I'm making udp echo server and client for some testing purpose.
They work properly, but I don't know how application can get
ICMP error (for example after sendto() - ICMP_UNREACH,
if there isn't server process on remote side) for appropriate
udp socket.
I've tried:
----
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
bind(sockfd, (struct sockaddr *) &cli, sizeof(cli));
if (sendto(sockfd, sendline, n, 0, pserv_addr, servlen) != n ) {
perror("sendto error");
exit(-1);
}
sleep(1);
getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &stat, &n);
-----
but 'stat' always = 0 (no error). I think sendto() doesn't wait
an error and ICMP_UNREACH don't affect to the socket.
In Solaris there is an option:
SO_DGRAM_ERRIND
application wants delayed error
that makes it possible to receive errors for datagram sockets
that are not connected.
My question is how application can get errors from ICMP
for connectionless socket after sending a packet to the server?
I don't subscribe to the maillist, please reply to my mail address
grn@ispras.ru!
Thank you.
Grigory Klyuchnikov, System Engineer,
Institute for System Programming
Russian Academy of Sciences
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