change the backlog of listen() from INT_MAX to 65535 due to the reason described…

change the backlog of listen() from INT_MAX to 65535 due to the reason described in https://codereview.appspot.com/7480046/

src/butil/endpoint.cpp

 // Copyright (c) 2011 Baidu, Inc.
-// 
+//
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
-// 
+//
 //     http://www.apache.org/licenses/LICENSE-2.0
-// 
+//
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -134,7 +134,7 @@ int hostname2ip(const char* hostname, ip_t* ip) {
     struct hostent* result = NULL;
     if (gethostbyname_r(hostname, &ent, aux_buf, sizeof(aux_buf),
                         &result, &error) != 0 || result == NULL) {
-        return -1; 
+        return -1;
     }
 #endif // defined(OS_MACOSX)
     // Only fetch the first address here
@@ -146,7 +146,7 @@ struct MyAddressInfo {
     char my_hostname[256];
     ip_t my_ip;
     IPStr my_ip_str;
-    
+
     MyAddressInfo() {
         my_ip = IP_ANY;
         if (gethostname(my_hostname, sizeof(my_hostname)) < 0) {
@@ -222,7 +222,7 @@ int hostname2endpoint(const char* str, EndPoint* point) {
     if (i == sizeof(buf) - 1) {
         return -1;
     }
-    
+
     buf[i] = '\0';
     if (hostname2ip(buf, &point->ip) != 0) {
         return -1;
@@ -333,13 +333,14 @@ int tcp_listen(EndPoint point, bool reuse_addr) {
     bzero((char*)&serv_addr, sizeof(serv_addr));
     serv_addr.sin_family = AF_INET;
     serv_addr.sin_addr = point.ip;
-    serv_addr.sin_port = htons(point.port); 
+    serv_addr.sin_port = htons(point.port);
     if (bind(sockfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) != 0) {
         return -1;
     }
-    if (listen(sockfd, INT_MAX) != 0) {
+    if (listen(sockfd, 65535) != 0) {
         //             ^^^ kernel would silently truncate backlog to the value
-        //             defined in /proc/sys/net/core/somaxconn
+        //             defined in /proc/sys/net/core/somaxconn if it is less
+        //             than 65535
         return -1;
     }
     return sockfd.release();