unistd: Add conversion from User to libc::passwd

Add From<User> for libc::passwd trait implementation to convert
a User into a libc::passwd

Implementation consumes the User struct, giving ownership over
the internal members to the libc::passwd struct

Add the User::gecos field to 64-bit Android builds, since it is
supported by libc::passwd for those builds

1 files changed, 8 insertions, 0 deletions

diff --git a/test/test_unistd.rs b/test/test_unistd.rs
index b95f1549..984dd2c9 100644
--- a/test/test_unistd.rs
+++ b/test/test_unistd.rs
@@ -1025,6 +1025,14 @@ fn test_access_file_exists() {
     assert!(access(&path, AccessFlags::R_OK | AccessFlags::W_OK).is_ok());
 }
 
+#[test]
+fn test_user_into_passwd() {
+    // get the UID of the "nobody" user
+    let nobody = User::from_name("nobody").unwrap().unwrap();
+    let pwd: libc::passwd = nobody.into();
+    let _: User = (&pwd).into();
+}
+
 /// Tests setting the filesystem UID with `setfsuid`.
 #[cfg(any(target_os = "linux", target_os = "android"))]
 #[test]