Date: Fri, 31 Jan 1997 14:15:02 +0100 (MET) From: hans@brandinnovators.com (Hans Zuidam) To: hackers@freebsd.org Subject: tunnel device and SIGIO weirdness Message-ID: <199701311315.OAA01068@truk.brandinnovators.com>
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Hi,
I've been trying to use the tunnel device for debugging a proprietary
TCP/IP stack. In order to simulate interrupts I use the async
notification (i.e. SIGIOs) on the fd for the TCP/IP stack.
As I ran into something that looks like missing or late arrival of
SIGIOs I decided to take a closer look at how SIGIOs are delivered:
[net/if_tun.c]
if (tp->tun_flags & TUN_ASYNC && tp->tun_pgrp) {
if (tp->tun_pgrp > 0)
gsignal(tp->tun_pgrp, SIGIO);
else if (p = pfind(-tp->tun_pgrp))
psignal(p, SIGIO);
}
while SIGIOs on sockets are delivered as
[kern/uipc_socket2.c]
if (so->so_state & SS_ASYNC) {
if (so->so_pgid < 0)
gsignal(-so->so_pgid, SIGIO);
else if (so->so_pgid > 0 && (p = pfind(so->so_pgid)) != 0)
psignal(p, SIGIO);
}
As far as I can see is the delivery of SIGIOs in the tunnel driver
wrong. The `... && tp->tun_pgrp) { if (tp->tun_pgrp > 0) ...' looks
redundant or in error. Can someone enlighten me? Thanks in advance,
Hans
--
H. Zuidam E-Mail: hans@brandinnovators.com
Brand Innovators B.V. P-Mail: P.O. Box 1377
de Pinckart 54 5602 BJ Eindhoven, The Netherlands
5674 CC Nuenen Tel. +31 40 2631134, Fax. +31 40 2831138
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