chown

platform/src/linux/mod.rs

@@ -8,6 +8,12 @@ pub fn chdir(path: *const c_char) -> c_int {
     }
 }
 
+pub fn chown(path: *const c_char, owner: usize, group: usize) -> c_int {
+    unsafe {
+        syscall!(CHOWN, owner as u32, group as u32) as c_int
+    }
+}
+
 pub fn close(fildes: c_int) -> c_int {
     unsafe {
         syscall!(CLOSE, fildes) as c_int

platform/src/redox/mod.rs

@@ -11,6 +11,10 @@ pub fn chdir(path: *const c_char) -> c_int {
     syscall::chdir(cstr_to_slice(path))? as c_int
 }
 
+pub fn chown(path: *const c_char, owner: usize, group: usize) -> c_int {
+    let fd = syscall::open(cstr_to_slice(path));
+    syscall::fchown(fd, owner as u32, group as u32)? as c_int
+
 pub fn close(fd: c_int) -> c_int {
     syscall::close(fd as usize);
     0

src/unistd/src/lib.rs

@@ -56,7 +56,7 @@ pub extern "C" fn chroot(path: *const c_char) -> c_int {
 
 #[no_mangle]
 pub extern "C" fn chown(path: *const c_char, owner: uid_t, group: gid_t) -> c_int {
-    unimplemented!();
+    platform::chown(path, owner, group)
 }
 
 #[no_mangle]