make_fdpair hangs trying to send large chunk of data

[0x0badc0de]

Faced this while using ZMQ under Wine on OS X. it just hangs on this line

libzmq/src/signaler.cpp

Line 543 in 1d58a00

nbytes = ::send (*w_, (char *) (dummy + dummy_size - still_to_send), still_to_send, 0);

trying to send 1MB into a socket.
Quick workaround:

$ sudo sysctl -w net.inet.tcp.sendspace=1300000
net.inet.tcp.sendspace: 131072 -> 1300000

But probably it would be better to make ZMQ working regardless of system buffer size. Let me know if any further details/debugging are required.

[bluca]

That is necessary to work around a Windows problem. Perhaps worth documenting that running Windows binaries on *nix needs at least a MB of TCP buffers.
Could you please send a PR to update the INSTALL file?

[0x0badc0de]

Sorry for delay, I see you've already done some changes, thanks for that!

[bluca]

No problem - thanks for finding the workaround