net: hangup TCP connection after Dial timeout in Plan 9
After Dial timeout, force close the TCP connection by writing "hangup" to the control file. This unblocks the "connect" command if the connection is taking too long to establish, and frees up the control file FD. Fixes #40118 Change-Id: I1cef8539cd9fe0793e32b49c9d0ef636b4b26e1d Reviewed-on: https://go-review.googlesource.com/c/go/+/241638 Run-TryBot: David du Colombier <0intro@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:David du Colombier <0intro@gmail.com>
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