[NaCl SDK] nacl_io: add getnameinfo scaffolding

This initial version still returns ENOSYS.

Review URL: https://codereview.chromium.org/512603008

Cr-Commit-Position: refs/heads/master@{#292515}

native_client_sdk/src/libraries/nacl_io/host_resolver.cc

@@ -221,6 +221,16 @@ void HostResolver::freeaddrinfo(struct addrinfo* res) {
   }
 }
 
+int HostResolver::getnameinfo(const struct sockaddr *sa,
+                              socklen_t salen,
+                              char *host,
+                              size_t hostlen,
+                              char *serv,
+                              size_t servlen,
+                              int flags) {
+  return ENOSYS;
+}
+
 int HostResolver::getaddrinfo(const char* node,
                               const char* service,
                               const struct addrinfo* hints_in,

native_client_sdk/src/libraries/nacl_io/host_resolver.h

@@ -21,6 +21,13 @@ class HostResolver {
   void Init(PepperInterface* ppapi);
 
   void freeaddrinfo(struct addrinfo* res);
+  int getnameinfo(const struct sockaddr *sa,
+                  socklen_t salen,
+                  char *host,
+                  size_t hostlen,
+                  char *serv,
+                  size_t servlen,
+                  int flags);
   int getaddrinfo(const char* node,
                   const char* service,
                   const struct addrinfo* hints,

native_client_sdk/src/libraries/nacl_io/kernel_intercept.cc

@@ -482,6 +482,18 @@ struct hostent* ki_gethostbyname(const char* name) {
   return s_state.kp->gethostbyname(name);
 }
 
+int ki_getnameinfo(const struct sockaddr *sa,
+                   socklen_t salen,
+                   char *host,
+                   size_t hostlen,
+                   char *serv,
+                   size_t servlen,
+                   unsigned int flags) {
+  ON_NOSYS_RETURN(EAI_SYSTEM);
+  return s_state.kp->getnameinfo(sa, salen, host, hostlen, serv, servlen,
+                                 flags);
+}
+
 int ki_getaddrinfo(const char* node,
                    const char* service,
                    const struct addrinfo* hints,

native_client_sdk/src/libraries/nacl_io/kernel_intercept.h

@@ -154,6 +154,13 @@ int ki_getaddrinfo(const char* node,
                    const struct addrinfo* hints,
                    struct addrinfo** res);
 struct hostent* ki_gethostbyname(const char* name);
+int ki_getnameinfo(const struct sockaddr *sa,
+                   socklen_t salen,
+                   char *host,
+                   size_t hostlen,
+                   char *serv,
+                   size_t servlen,
+                   unsigned int flags);
 int ki_getpeername(int fd, struct sockaddr* addr, socklen_t* len);
 int ki_getsockname(int fd, struct sockaddr* addr, socklen_t* len);
 int ki_getsockopt(int fd, int lvl, int optname, void* optval, socklen_t* len);

native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc

@@ -1356,6 +1356,17 @@ int KernelProxy::getaddrinfo(const char* node,
   return host_resolver_.getaddrinfo(node, service, hints, res);
 }
 
+int KernelProxy::getnameinfo(const struct sockaddr *sa,
+                             socklen_t salen,
+                             char *host,
+                             size_t hostlen,
+                             char *serv,
+                             size_t servlen,
+                             int flags) {
+  return host_resolver_.getnameinfo(sa, salen, host, hostlen, serv, servlen,
+                                    flags);
+}
+
 struct hostent* KernelProxy::gethostbyname(const char* name) {
   return host_resolver_.gethostbyname(name);
 }

native_client_sdk/src/libraries/nacl_io/kernel_proxy.h

@@ -177,6 +177,13 @@ class KernelProxy : protected KernelObject {
                           const char* service,
                           const struct addrinfo* hints,
                           struct addrinfo** res);
+  virtual int getnameinfo(const struct sockaddr *sa,
+                          socklen_t salen,
+                          char *host,
+                          size_t hostlen,
+                          char *serv,
+                          size_t servlen,
+                          int flags);
   virtual int getpeername(int fd, struct sockaddr* addr, socklen_t* len);
   virtual int getsockname(int fd, struct sockaddr* addr, socklen_t* len);
   virtual int getsockopt(int fd,

native_client_sdk/src/libraries/nacl_io/library.dsc

@@ -83,6 +83,7 @@
         "syscalls/getaddrinfo.c",
         "syscalls/getcwd.c",
         "syscalls/gethostbyname.c",
+        "syscalls/getnameinfo.c",
         "syscalls/getpeername.c",
         "syscalls/getsockname.c",
         "syscalls/getsockopt.c",

native_client_sdk/src/libraries/nacl_io/syscalls/getnameinfo.c

+/* Copyright 2014 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 "nacl_io/kernel_intercept.h"
+#include "nacl_io/kernel_wrap.h"
+
+#ifdef __native_client__
+int getnameinfo(const struct sockaddr *sa, socklen_t salen, char *host,
+                socklen_t hostlen, char *serv, socklen_t servlen,
+                unsigned int flags) {
+  return ki_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
+}
+#endif