Move /src/test to /tests

tests/ui/attributes/unix_sigpipe/auxiliary/sigpipe-utils.rs

@@ -0,0 +1,33 @@
+#![feature(rustc_private)]
+extern crate libc;
+
+/// So tests don't have to bring libc in scope themselves
+pub enum SignalHandler {
+    Ignore,
+    Default,
+}
+
+/// Helper to assert that [`libc::SIGPIPE`] has the expected signal handler.
+pub fn assert_sigpipe_handler(expected_handler: SignalHandler) {
+    #[cfg(unix)]
+    #[cfg(not(any(
+        target_os = "emscripten",
+        target_os = "fuchsia",
+        target_os = "horizon",
+        target_os = "android",
+    )))]
+    {
+        let prev = unsafe { libc::signal(libc::SIGPIPE, libc::SIG_IGN) };
+
+        let expected = match expected_handler {
+            SignalHandler::Ignore => libc::SIG_IGN,
+            SignalHandler::Default => libc::SIG_DFL,
+        };
+        assert_eq!(prev, expected, "expected sigpipe value matches actual value");
+
+        // Unlikely to matter, but restore the old value anyway
+        unsafe {
+            libc::signal(libc::SIGPIPE, prev);
+        };
+    }
+}