use std_options for keep_sigpipe and existence of SIG.PIPE to check for support

lib/std/std.zig

@@ -167,6 +167,22 @@ pub const options = struct {
         options_override.crypto_always_getrandom
     else
         false;
+
+    /// By default Zig disables SIGPIPE by setting a "no-op" handler for it.  Set this option
+    /// to `true` to prevent that.
+    ///
+    /// Note that we use a "no-op" handler instead of SIG_IGN because it will not be inherited by
+    /// any child process.
+    ///
+    /// SIGPIPE is triggered when a process attempts to write to a broken pipe. By default, SIGPIPE
+    /// will terminate the process instead of exiting.  It doesn't trigger the panic handler so in many
+    /// cases it's unclear why the process was terminated.  By capturing SIGPIPE instead, functions that
+    /// write to broken pipes will return the EPIPE error (error.BrokenPipe) and the program can handle
+    /// it like any other error.
+    pub const keep_sigpipe: bool = if (@hasDecl(options_override, "keep_sigpipe"))
+        options_override.keep_sigpipe
+    else
+        false;
 };
 
 // This forces the start.zig file to be imported, and the comptime logic inside that