[Bug 196061] New: setsockopt(s,IPPROTO_TCP,TCP_NODELAY,...) returns -1 && errno == 0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196061

            Bug ID: 196061
           Summary: setsockopt(s,IPPROTO_TCP,TCP_NODELAY,...) returns -1
                    && errno == 0
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ve3wwg at gmail.com

setsockopt(s,IPPROTO_TCP,TCP_NODELAY,...) returns -1 as if it has failed, but
errno == 0. This occurs on an IPv4 socket, newly accepted by:

   accept4(...,SOCK_NONBLOCK|SOCK_CLOEXEC);

It appears that the setsockopt() call has succeeded because there seems to be
some improvement in the http server performance after the call.

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