[NaCl SDK] nacl_io: Add initial implementations of kill and signal

native_client_sdk/src/libraries/nacl_io/kernel_intercept.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <errno.h>
 
 #include "nacl_io/kernel_intercept.h"
 #include "nacl_io/kernel_proxy.h"
 #include "nacl_io/kernel_wrap.h"
 #include "nacl_io/osmman.h"
@@ skipping 239 matching lines @@
   ON_NOSYS_RETURN(-1);
   return s_kp->tcgetattr(fd, termios_p);
 }
 
 int ki_tcsetattr(int fd, int optional_actions,
                  const struct termios *termios_p) {
   ON_NOSYS_RETURN(-1);
   return s_kp->tcsetattr(fd, optional_actions, termios_p);
 }
 
+int ki_kill(pid_t pid, int sig) {
+  ON_NOSYS_RETURN(-1);
+  return s_kp->kill(pid, sig);
+}
+
+sighandler_t ki_signal(int signum, sighandler_t handler) {
+  ON_NOSYS_RETURN(SIG_ERR);
+  return s_kp->signal(signum, handler);
+}
+
+sighandler_t ki_sigset(int signum, sighandler_t handler) {
+  ON_NOSYS_RETURN(SIG_ERR);
+  return s_kp->sigset(signum, handler);
+}
+
 #ifdef PROVIDES_SOCKET_API
 // Socket Functions
 int ki_accept(int fd, struct sockaddr* addr, socklen_t* len) {
   return s_kp->accept(fd, addr, len);
 }
 
 int ki_bind(int fd, const struct sockaddr* addr, socklen_t len) {
   return s_kp->bind(fd, addr, len);
 }
 
@@ skipping 56 matching lines @@
 }
 
 int ki_socket(int domain, int type, int protocol) {
   return s_kp->socket(domain, type, protocol);
 }
 
 int ki_socketpair(int domain, int type, int protocol, int* sv) {
   return s_kp->socketpair(domain, type, protocol, sv);
 }
 #endif  // PROVIDES_SOCKET_API