Could you please look at the following patch:
https://github.com/shripchenko/libzmq/commit/0c3d9179262ab431b8949b8646eed9a1a1e4a233
I implemented new setsockopts(): ZMQ_TCP_KEEPALIVE, ZMQ_TCP_KEEPALIVE_CNT,
ZMQ_TCP_KEEPALIVE_IDLE, ZMQ_TCP_KEEPALIVE_INTVL
to configure TCP keep-alives on TCP sockets(keep-alives are fully transparent
to the program and functions like select(), poll(), e.t.c.)
They all defaults to -1 which means ignore them and leave it all for OS
defaults.
If some of them not supported by OS then
zmq->socket()->setsockopt(ZMQ_TCP_KEEPALIVE*) call will return 0 but leave
option = -1.
The big problem here is that although SO_KEEPALIVE is cross-platform safe(at
least Internet said so, but still needs to be tested on all platforms),
All other options like TCP_KEEPCNT, TCP_KEEPIDLE, TCP_KEEPINTVL work on linux,
possibly work in *bsd and will not work on windows in current implementation.
On windows it could be done with this code:
tcp_keepalive alive;
alive.onoff = TRUE;
alive.keepalivetime = 60000;
alive.keepaliveinterval = 1000;
int bytes_ret=0;
res = WSAIoctl(socket, SIO_KEEPALIVE_VALS, &alive, sizeof(alive), NULL, 0,
&bytes_ret, NULL, NULL);
Unfortunately I have no windows knowledge, so could someone please help me to
modify this patch to work on windows.
P.S.
And test it on other platforms.
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