diff --git a/.github/workflows/commits.yml b/.github/workflows/commits.yml
new file mode 100644
index 0000000..541a8f9
--- /dev/null
+++ b/.github/workflows/commits.yml
@@ -0,0 +1,40 @@
+name: Commits
+on:
+  - pull_request
+
+permissions:
+  contents: read
+
+jobs:
+  dco-check:
+    permissions:
+      pull-requests: read  # for tim-actions/get-pr-commits to get list of commits from the PR
+    name: Signed-off-by (DCO)
+    runs-on: ubuntu-20.04
+    steps:
+    - name: Get PR Commits
+      id: 'get-pr-commits'
+      uses: tim-actions/get-pr-commits@master
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Check that all commits are signed-off
+      uses: tim-actions/dco@master
+      with:
+        commits: ${{ steps.get-pr-commits.outputs.commits }}
+
+  target-branch:
+    permissions:
+      contents: none
+    name: Branch target
+    runs-on: ubuntu-20.04
+    steps:
+    - name: Check branch target
+      env:
+        TARGET: ${{ github.event.pull_request.base.ref }}
+      run: |
+        set -x
+        [ "${TARGET}" = "main" ] && exit 0
+
+        echo "Invalid branch target: ${TARGET}"
+        exit 1
diff --git a/ext/lxc/lxc.c b/ext/lxc/lxc.c
index b0ec634..6a1f394 100644
--- a/ext/lxc/lxc.c
+++ b/ext/lxc/lxc.c
@@ -41,8 +41,28 @@ extern void *rb_thread_call_without_gvl(void *(*func)(void *), void *data1,
 #define RELEASING_GVL2(func, arg, killfunc, killarg) func(arg)
 #endif
 
-extern int lxc_wait_for_pid_status(pid_t pid);
-extern long lxc_config_parse_arch(const char *arch);
+//extern int lxc_wait_for_pid_status(pid_t pid);
+#include <sys/types.h>
+#include <sys/wait.h>
+int lxc_wait_for_pid_status(pid_t pid)
+{
+	int status, ret;
+
+again:
+	ret = waitpid(pid, &status, 0);
+	if (ret == -1) {
+		if (errno == EINTR)
+			goto again;
+
+		return -1;
+	}
+
+	if (ret != pid)
+		goto again;
+
+	return status;
+}
+//extern long lxc_config_parse_arch(const char *arch);
 
 static VALUE Container;
 static VALUE Error;
@@ -98,24 +118,24 @@ free_c_string_array(char **arr)
  * "personality", either +:linux32+ or +:linux+, for the 32-bit and 64-bit
  * architectures, respectively.
  */
-static VALUE
-lxc_arch_to_personality(VALUE self, VALUE rb_arch)
-{
-    int ret;
-    char *arch;
-
-    arch = StringValuePtr(rb_arch);
-    ret = lxc_config_parse_arch(arch);
-
-    switch (ret) {
-    case PER_LINUX32:
-        return SYMBOL("linux32");
-    case PER_LINUX:
-        return SYMBOL("linux");
-    default:
-        rb_raise(Error, "unknown personality");
-    }
-}
+//static VALUE
+//lxc_arch_to_personality(VALUE self, VALUE rb_arch)
+//{
+//    int ret;
+//    char *arch;
+//
+//    arch = StringValuePtr(rb_arch);
+//    ret = lxc_config_parse_arch(arch);
+//
+//    switch (ret) {
+//    case PER_LINUX32:
+//        return SYMBOL("linux32");
+//    case PER_LINUX:
+//        return SYMBOL("linux");
+//    default:
+//        rb_raise(Error, "unknown personality");
+//    }
+//}
 
 /*
  * call-seq:
@@ -2127,8 +2147,8 @@ Init_lxc(void)
 {
     VALUE LXC = rb_define_module("LXC");
 
-    rb_define_singleton_method(LXC, "arch_to_personality",
-                               lxc_arch_to_personality, 1);
+    //rb_define_singleton_method(LXC, "arch_to_personality",
+    //                           lxc_arch_to_personality, 1);
     rb_define_singleton_method(LXC, "run_command", lxc_run_command, 1);
     rb_define_singleton_method(LXC, "run_shell", lxc_run_shell, 0);
     rb_define_singleton_method(LXC, "global_config_item",