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According to this informative thread, roslaunch handles SIGINT, SIGTERM, SIGKILL, but not SIGACTION. I've confirmed by scanning the latest code from https://github.com/ros/ros_comm/tree/lunar-devel/tools/roslaunch that sigaction is not particularly handled.
$ git branch
* lunar-devel
$ git log -1
commit 283818529002c6d37e8b9ec554a17b40c6075c20
Author: nano-meter <pjoejoejoe@gmail.com>
Date: Thu Apr 5 22:47:14 2018 +0200
Add substitution when loading yaml files (#1354)
* Add substitution when loading yaml files
like in #1051
* Add tests
$ ack-grep -A 1 -i sigaction .
$
Btw, just wondering if you're aware of some existing ROS packages that provide TCP communication. For websocket there is http://wiki.ros.org/rosbridge_server
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