--- Linux-Clone/Clone.xs	2022/07/25 10:59:29	1.5
+++ Linux-Clone/Clone.xs	2022/09/03 23:47:02	1.6
@@ -11,6 +11,11 @@
 #include <unistd.h>
 #include <sys/syscall.h>
 
+#include <sched.h>
+
+#include <sys/ioctl.h>
+#include <net/if.h>
+
 #ifdef __has_include
   #if !__has_include("linux/kcmp.h") // use "" as GCC wrongly expands macros
     #undef SYS_kcmp
@@ -78,6 +83,9 @@
   } *civ, const_iv[] = {
 #   define const_iv(name)       { # name, (IV)name },
 #   define const_iv_clone(name) { # name, (IV) CLONE_ ## name },
+#   ifdef CSIGNAL
+      const_iv (CSIGNAL)
+#   endif
 #   ifdef CLONE_FILES
       const_iv_clone (FILES)
 #   endif
@@ -193,8 +201,7 @@
               }
           }
 }
-	OUTPUT:
-        RETVAL
+	OUTPUT: RETVAL
 
 int
 unshare (int flags)
@@ -209,9 +216,23 @@
         RETVAL = syscall (SYS_pivot_root,
                           (const char *)SvPVbyte_nolen (new_root),
                           (const char *)SvPVbyte_nolen (old_root));
-	OUTPUT:
-        RETVAL
+	OUTPUT: RETVAL
 
 int
 kcmp (IV pid1, IV pid2, IV type, UV idx1 = 0, UV idx2 = 0)
 
+int
+siocsifflags (char *ifname, U32 flags = IFF_UP)
+	CODE:
+{
+        int saved_errno;
+	struct ifreq ifr;
+	int fd = socket (AF_INET, SOCK_DGRAM, 0);
+        strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+        RETVAL = ioctl (fd, SIOCSIFFLAGS, &ifr);
+        saved_errno = errno;
+        close (fd);
+        errno = saved_errno;
+}
+	OUTPUT: RETVAL
+