Allow receiving multiple FD over a ControlMessage

Fixes #464

CHANGELOG.md

@@ -55,6 +55,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 # Fixed
 - Fix compilation and tests for OpenBSD targets
   ([#688](https://github.com/nix-rust/nix/pull/688))
+- Fixed receiving multiple File Descriptors over a Unix Socket
+  ([#473](https://github.com/nix-rust/nix/pull/473))
 
 # Removed
 - The syscall module has been removed. This only exposed enough functionality for

src/sys/socket/mod.rs

@@ -275,7 +275,7 @@ impl<'a> Iterator for CmsgIterator<'a> {
             (libc::SOL_SOCKET, libc::SCM_RIGHTS) => unsafe {
                 Some(ControlMessage::ScmRights(
                     slice::from_raw_parts(
-                        &cmsg.cmsg_data as *const _ as *const _, 1)))
+                        &cmsg.cmsg_data as *const _ as *const _, len / mem::size_of::<RawFd>())))
             },
             (_, _) => unsafe {
                 Some(ControlMessage::Unknown(UnknownCmsg(

test/sys/test_socket.rs

@@ -236,7 +236,6 @@ pub fn test_syscontrol() {
 }
 
 #[test]
-#[ignore]
 fn test_scm_rights_multiple_fd() {
     use std::os::unix::net::UnixDatagram;
     use std::os::unix::io::{RawFd, AsRawFd};