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macOS and iOS deliver SIGPIPE signals to the main thread and not the thread that raised it by writing to a closed socket or pipe. SIGPIPE signals can be suppressed for sockets with the SO_NOSIGPIPE option, but there is no similar option for pipes. We have no other choice but to never forward SIGPIPE on macOS. This is a fixup of reverted CL 188297. Fixes #33384 Change-Id: I09b258b078857ad3b22025bc2902d1b12d2afd92 Reviewed-on: https://go-review.googlesource.com/c/go/+/191785 Run-TryBot: Elias Naur <mail@eliasnaur.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>