8409 Want MSG_NOSIGNAL to prevent SIGPIPE

Review Request #590 — Created June 18, 2017 and submitted — Latest diff uploaded

wiedi
illumos-gate
general

The MSG_NOSIGNAL flag prevents SIGPIPE being generated when an attempt
to send on a stream-oriented socket is made that is no longer connected.
It is part of POSIX.1-2008:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/send.html

This change includes a test-case. I booted a system with this patch and executed the os-test suite.

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