Merge #923

923: Fix control message *decoding* and add support for `ScmCredentials` r=asomers a=jonas-schievink

While https://github.com/nix-rust/nix/pull/918 fixed the *encoding*, the *decoding* done by the `CmsgIterator` still remained broken when multiple messages are received. However, since nix didn't support any control message that could reliably be sent twice in one `sendmsg` call, this couldn't be tested properly.

This PR addresses this by adding `SCM_CREDENTIALS` support and testing all of this by passing both an `SCM_CREDENTIALS` and a `SCM_RIGHTS` message at the same time.

I've also verified that the resulting encoding is the same as for roughly equivalent C code.

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

1 files changed, 15 insertions, 0 deletions

diff --git a/src/unistd.rs b/src/unistd.rs
index 8022aa0b..32d0405e 100644
--- a/src/unistd.rs
+++ b/src/unistd.rs
@@ -48,6 +48,11 @@ impl Uid {
     pub fn is_root(&self) -> bool {
         *self == ROOT
     }
+
+    /// Get the raw `uid_t` wrapped by `self`.
+    pub fn as_raw(&self) -> uid_t {
+        self.0
+    }
 }
 
 impl From<Uid> for uid_t {
@@ -87,6 +92,11 @@ impl Gid {
     pub fn effective() -> Self {
         getegid()
     }
+
+    /// Get the raw `gid_t` wrapped by `self`.
+    pub fn as_raw(&self) -> gid_t {
+        self.0
+    }
 }
 
 impl From<Gid> for gid_t {
@@ -123,6 +133,11 @@ impl Pid {
     pub fn parent() -> Self {
         getppid()
     }
+
+    /// Get the raw `pid_t` wrapped by `self`.
+    pub fn as_raw(&self) -> pid_t {
+        self.0
+    }
 }
 
 impl From<Pid> for pid_t {