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List: linux-netdev
Subject: Fw: F_SETSIG broken/changed in 2.6 for UDP and TCP sockets?
From: Andrew Morton <akpm () osdl ! org>
Date: 2004-05-31 22:18:43
Message-ID: 20040531151843.7144dfce.akpm () osdl ! org
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Begin forwarded message:
Date: Mon, 31 May 2004 14:45:08 -0400
From: Russell Leighton <russ@elegant-software.com>
To: linux-kernel@vger.kernel.org
Subject: F_SETSIG broken/changed in 2.6 for UDP and TCP sockets?
I have a program that works fine under stock rh9 (2.4.2-8) but has
issues getting signaled under FedoraCore2 (2.6.5-1.358)
using SETSIG to a Posix RT signal.
The program does the standard:
/* hook to process */
if ( fcntl(fdcallback->fd, F_SETOWN, mon->handler_q.thread->pid) == -1 ) {
aw_log(fdcallback->handler->logger, AW_ERROR_LOG_LEVEL,
"cannot set owner on fd (%s)",
strerror(errno));
}/* end if */
/* make async */
if ( fcntl(fdcallback->fd, F_SETFL, (O_NONBLOCK | O_ASYNC) ) == -1 ) {
aw_log(fdcallback->handler->logger, AW_ERROR_LOG_LEVEL,
"cannot set async on fd (%s)",
strerror(errno));
}/* end if */
/* hook to signal */
if ( fcntl(fdcallback->fd, F_SETSIG, AW_SIG_FD) == -1 ) {
aw_log(fdcallback->handler->logger, AW_ERROR_LOG_LEVEL,
"cannot set signal on fd (%s)",
strerror(errno));
}/* end if */
Under Fedora things work well for raw sockets (much lower latency than
in 2.4!) but are inconsistent with udp or tcp sockets.
In the udp case, I when I listen for multicast packets my app only
receives them when I am running a tcpdump (bizarre!).
In the tcp case, I don't get signaled if I do the F_SETSIG on more than
1 fd.
Any tips on tracking this down would be much appreciated.
Thx
Russ
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