Move test_aio_drop into its own process

This works around a bug in OSX that hoses the AIO subsystem.

Cargo.toml

@@ -31,6 +31,10 @@ nix-test = { path = "nix-test", version = "0.0.1" }
 name = "test"
 path = "test/test.rs"
 
+[[test]]
+name = "test-aio-drop"
+path = "test/sys/test_aio_drop.rs"
+
 [[test]]
 name = "test-mount"
 path = "test/test_mount.rs"

test/sys/test_aio.rs

@@ -499,23 +499,3 @@ fn test_lio_listio_read_immutable() {
                            LioOpcode::LIO_READ);
     let _ = lio_listio(LioMode::LIO_NOWAIT, &[&mut rcb], SigevNotify::SigevNone);
 }
-
-// Test dropping an AioCb that hasn't yet finished.
-// Skip on OSX where this test seems to hose the AIO subsystem and
-// causes subsequent tests to fail
-#[test]
-#[should_panic(expected = "Dropped an in-progress AioCb")]
-#[cfg(not(any(target_os = "macos", target_env = "musl")))]
-fn test_drop() {
-    const WBUF: &'static [u8] = b"CDEF";
-
-    let f = tempfile().unwrap();
-    f.set_len(6).unwrap();
-    let mut aiocb = AioCb::from_slice( f.as_raw_fd(),
-                           2,   //offset
-                           &WBUF,
-                           0,   //priority
-                           SigevNotify::SigevNone,
-                           LioOpcode::LIO_NOP);
-    aiocb.write().unwrap();
-}

test/sys/test_aio_drop.rs

@@ -0,0 +1,27 @@
+extern crate nix;
+extern crate tempfile;
+
+use nix::sys::aio::*;
+use nix::sys::signal::*;
+use std::os::unix::io::AsRawFd;
+use tempfile::tempfile;
+
+// Test dropping an AioCb that hasn't yet finished.
+// This must happen in its own process, because on OSX this test seems to hose
+// the AIO subsystem and causes subsequent tests to fail
+#[test]
+#[should_panic(expected = "Dropped an in-progress AioCb")]
+#[cfg(not(target_env = "musl"))]
+fn test_drop() {
+    const WBUF: &'static [u8] = b"CDEF";
+
+    let f = tempfile().unwrap();
+    f.set_len(6).unwrap();
+    let mut aiocb = AioCb::from_slice( f.as_raw_fd(),
+                           2,   //offset
+                           &WBUF,
+                           0,   //priority
+                           SigevNotify::SigevNone,
+                           LioOpcode::LIO_NOP);
+    aiocb.write().unwrap();
+}