runtime: enforce standard file descriptors open on init on unix On Unix-like platforms, enforce that the standard file descriptions (0, 1, 2) are always open during initialization. If any of the FDs are closed, we open them pointing at /dev/null, or fail. Fixes #60641 Change-Id: Iaab6b3f3e5ca44006ae3ba3544d47da9a613f58f Reviewed-on: https://go-review.googlesource.com/c/go/+/509020 Reviewed-by: Michael Pratt <mpratt@google.com> Run-TryBot: Roland Shoemaker <roland@golang.org> Auto-Submit: Roland Shoemaker <roland@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
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