diff --git a/ap/libc/glibc/glibc-2.23/hurd/hurdkill.c b/ap/libc/glibc/glibc-2.23/hurd/hurdkill.c
new file mode 100644
index 0000000..2ae9631
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/hurd/hurdkill.c
@@ -0,0 +1,92 @@
+/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <sys/types.h>
+#include <signal.h>
+#include <hurd.h>
+#include <hurd/port.h>
+#include <hurd/signal.h>
+#include <hurd/msg.h>
+
+/* Send a `sig_post' RPC to process number PID.  If PID is zero,
+   send the message to all processes in the current process's process group.
+   If PID is < -1, send SIG to all processes in process group - PID.
+   SIG and REFPORT are passed along in the request message.  */
+error_t
+_hurd_sig_post (pid_t pid, int sig, mach_port_t arg_refport)
+{
+  int delivered = 0;		/* Set when we deliver any signal.  */
+  error_t err;
+  mach_port_t proc;
+  struct hurd_userlink ulink;
+
+  inline void kill_pid (pid_t pid) /* Kill one PID.  */
+    {
+      err = HURD_MSGPORT_RPC (__proc_getmsgport (proc, pid, &msgport),
+			      (refport = arg_refport, 0), 0,
+			      /* If no message port we cannot send signals.  */
+			      msgport == MACH_PORT_NULL ? EPERM :
+			      __msg_sig_post (msgport, sig, 0, refport));
+      if (! err)
+	delivered = 1;
+    }
+
+  proc = _hurd_port_get (&_hurd_ports[INIT_PORT_PROC], &ulink);
+
+  if (pid <= 0)
+    {
+      /* Send SIG to each process in pgrp (- PID).  */
+      mach_msg_type_number_t npids = 10, i;
+      pid_t pidsbuf[10], *pids = pidsbuf;
+
+      err = __proc_getpgrppids (proc, - pid, &pids, &npids);
+      if (!err)
+	{
+	  int self = 0;
+	  for (i = 0; i < npids; ++i)
+	    if (pids[i] == _hurd_pid)
+	      /* We must do ourselves last so we are not suspended
+		 and fail to suspend the other processes in the pgrp.  */
+	      self = 1;
+	    else
+	      {
+		kill_pid (pids[i]);
+		if (err == ESRCH)
+		  /* The process died already.  Ignore it.  */
+		  err = 0;
+	      }
+	  if (pids != pidsbuf)
+	    __vm_deallocate (__mach_task_self (),
+			     (vm_address_t) pids, npids * sizeof (pids[0]));
+
+	  if (self)
+	    kill_pid (_hurd_pid);
+	}
+    }
+  else
+    kill_pid (pid);
+
+  _hurd_port_free (&_hurd_ports[INIT_PORT_PROC], &ulink, proc);
+
+  /* If we delivered no signals, but ERR is clear, this must mean that
+     every kill_pid call failed with ESRCH, meaning all the processes in
+     the pgrp died between proc_getpgrppids and kill_pid; in that case we
+     fail with ESRCH.  */
+  return delivered ? 0 : err ?: ESRCH;
+}
+weak_alias (_hurd_sig_post, hurd_sig_post)