Merge #921

921: Get `SO_PEERCRED` working on all Linux targets r=asomers a=jonas-schievink

These were disabled for ARM way back in 0db6ed1 and 09c00ed. Try to enable them for all arches and Android as well, since the removal wasn't really explained and I see no reason why this shouldn't work.

Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>

CHANGELOG.md

@@ -8,6 +8,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 - Added a `sysinfo` wrapper.
   ([#922](https://github.com/nix-rust/nix/pull/922))
+- Support the `SO_PEERCRED` socket option and the `UnixCredentials` type on all Linux and Android targets.
+  ([#921](https://github.com/nix-rust/nix/pull/921))
 
 ### Changed
 

src/sys/socket/mod.rs

@@ -173,7 +173,7 @@ libc_bitflags!{
 }
 
 cfg_if! {
-    if #[cfg(all(target_os = "linux", not(target_arch = "arm")))] {
+    if #[cfg(any(target_os = "android", target_os = "linux"))] {
         /// Unix credentials of the sending process.
         ///
         /// This struct is used with the `SO_PEERCRED` ancillary message for UNIX sockets.

src/sys/socket/sockopt.rs

@@ -225,7 +225,7 @@ sockopt_impl!(Both, Broadcast, libc::SOL_SOCKET, libc::SO_BROADCAST, bool);
 sockopt_impl!(Both, OobInline, libc::SOL_SOCKET, libc::SO_OOBINLINE, bool);
 sockopt_impl!(GetOnly, SocketError, libc::SOL_SOCKET, libc::SO_ERROR, i32);
 sockopt_impl!(Both, KeepAlive, libc::SOL_SOCKET, libc::SO_KEEPALIVE, bool);
-#[cfg(all(target_os = "linux", not(target_arch="arm")))]
+#[cfg(any(target_os = "android", target_os = "linux"))]
 sockopt_impl!(GetOnly, PeerCredentials, libc::SOL_SOCKET, libc::SO_PEERCRED, super::UnixCredentials);
 #[cfg(any(target_os = "ios",
           target_os = "macos"))]
@@ -478,7 +478,7 @@ unsafe impl<'a> Set<'a, usize> for SetUsize {
 
 #[cfg(test)]
 mod test {
-    #[cfg(all(target_os = "linux", not(target_arch = "arm")))]
+    #[cfg(any(target_os = "android", target_os = "linux"))]
     #[test]
     fn can_get_peercred_on_unix_socket() {
         use super::super::*;