getaddrinfo: add AI_NUMERICHOST flag handle

Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>

libs/libc/netdb/lib_getaddrinfo.c

@@ -306,10 +306,8 @@ int getaddrinfo(FAR const char *hostname, FAR const char *servname,
       return EAI_MEMORY;
     }
 
-  /* REVISIT: no check for AI_NUMERICHOST flag. */
-
   gethostentbyname_r(hostname, &host,
-                     hostbuffer, CONFIG_NETDB_BUFSIZE, &ret);
+                     hostbuffer, CONFIG_NETDB_BUFSIZE, &ret, flags);
   if (ret != OK)
     {
       lib_free(hostbuffer);

libs/libc/netdb/lib_gethostbyname2r.c

@@ -83,7 +83,7 @@ int gethostbyname2_r(FAR const char *name, int type,
 
   *result = NULL;
 
-  ret = gethostentbyname_r(name, &tmp, buf, buflen, h_errnop);
+  ret = gethostentbyname_r(name, &tmp, buf, buflen, h_errnop, 0);
   if (ret == OK)
     {
       if (convert_hostent(&tmp, type, host))

libs/libc/netdb/lib_gethostentbynamer.c

@@ -716,7 +716,7 @@ errorout_with_herrnocode:
 
 int gethostentbyname_r(FAR const char *name,
                        FAR struct hostent_s *host, FAR char *buf,
-                       size_t buflen, FAR int *h_errnop)
+                       size_t buflen, FAR int *h_errnop, int flags)
 {
   DEBUGASSERT(name != NULL && host != NULL && buf != NULL);
 
@@ -735,6 +735,12 @@ int gethostentbyname_r(FAR const char *name,
 
       return OK;
     }
+  else if ((flags & AI_NUMERICHOST) != 0)
+    {
+      *h_errnop = EAI_NONAME;
+
+      return ERROR;
+    }
 
 #ifdef CONFIG_NET_LOOPBACK
   /* Check for the local loopback host name */

libs/libc/netdb/lib_netdb.h

@@ -113,7 +113,7 @@ ssize_t parse_hostfile(FAR FILE *stream, FAR struct hostent_s *host,
 
 int gethostentbyname_r(FAR const char *name,
                        FAR struct hostent_s *host, FAR char *buf,
-                       size_t buflen, FAR int *h_errnop);
+                       size_t buflen, FAR int *h_errnop, int flags);
 
 #undef EXTERN
 #ifdef __cplusplus