flushing a socket on linux

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I tried ioctl(fd, TCFLSH, 0) but I think that only
works for terminal file descriptors not sockets.

What I am trying to do is detect a socketpair()
connection has been lost before I use sendmsg
to send a file descriptor to the other task.

I do realize that catching SIGPIPE after sendmsg is
called should work, I need to know if the connection
is lost before that.

Please CC me directly.

Thanks,

Jerry Geis

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