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NOTE: Keep these constants in sync with library/std/src/sys/unix/mod.rs!

Constants

The default value if #[unix_sigpipe] is not specified. This resolves to SIG_IGN in library/std/src/sys/unix/mod.rs.
Do not touch SIGPIPE. Use whatever the parent process uses.
Change SIGPIPE to SIG_DFL so that the process is killed when trying to write to a closed pipe. This is usually the desired behavior for CLI apps that produce textual output that you want to pipe to other programs such as head -n 1.
Change SIGPIPE to SIG_IGN so that failed writes results in EPIPE that are eventually converted to ErrorKind::BrokenPipe.