添加EAGAIN处理

http_check/src/http_check.c

@@ -165,7 +165,13 @@ int readNlSock(int sockFd, char *bufPtr, int seqNum, int pId)
     	//收到内核的应答   
 		if((readLen = recv(sockFd, bufPtr, BUFSIZE - msgLen, 0)) < 0)   
 	    {
-	    	printf("sock read error!");   
+#if 1
+	    	if(errno == EAGAIN)  
+            {  
+                continue;  
+            }
+#endif
+	    	printf("sock recv return for readLen < 0!");   
 	      	return -1;   
 	    }   
 
@@ -173,11 +179,11 @@ int readNlSock(int sockFd, char *bufPtr, int seqNum, int pId)
 	    //检查header是否有效   
 	    if((NLMSG_OK(nlHdr, readLen) == 0) || (nlHdr->nlmsg_type == NLMSG_ERROR))   
 	    {   
-	      	printf("error in recieved packet!\n");   
+	      	printf("sock recv return for header error!\n");   
 	      	return -1;   
 	    }   
 
-	    if(nlHdr->nlmsg_type == NLMSG_DONE)    
+	    if(nlHdr->nlmsg_type == NLMSG_DONE)//内核返回最后一条消息的类型为NLMSG_DONE    
 	    {   
 	     	break;   
 	    }   
@@ -197,21 +203,26 @@ int readNlSock(int sockFd, char *bufPtr, int seqNum, int pId)
 }   
 
 //分析返回的路由信息   
-void parseRoutes(struct nlmsghdr *nlHdr, struct route_info *rtInfo,char *gateway,unsigned int len)   
+void parseRoutes(struct nlmsghdr *nlHdr,char *gateway,unsigned int len)   
 {   
 	struct rtmsg *rtMsg = NULL;   
   	struct rtattr *rtAttr = NULL;   
   	int rtLen;        
 	char dst_address[MAX_STR_LEN] = "";
+	struct route_info rtInfo;
+
+	memset(&rtInfo, 0, sizeof(struct route_info));
   	rtMsg = (struct rtmsg *)NLMSG_DATA(nlHdr);   
   	// If the route is not for AF_INET or does not belong to main routing table   
   	//then return.    
+  	//RT_TABLE_LOCAL存储目的地址是本机的路由表项，这些目的地址就是为各个网卡配置的IP地址；
+    //RT_TABLE_MAIN存储到其它主机的路由表项；
   	if((rtMsg->rtm_family != AF_INET) || (rtMsg->rtm_table != RT_TABLE_MAIN))
   	{
   		return; 
   	}
 
-  	rtAttr = (struct rtattr *)RTM_RTA(rtMsg);   
+  	rtAttr = (struct rtattr *)RTM_RTA(rtMsg); //路由信息  
   	rtLen = RTM_PAYLOAD(nlHdr);
   
   	for(;RTA_OK(rtAttr,rtLen);rtAttr = RTA_NEXT(rtAttr,rtLen))
@@ -219,43 +230,43 @@ void parseRoutes(struct nlmsghdr *nlHdr, struct route_info *rtInfo,char *gateway
    		switch(rtAttr->rta_type) 
 		{   
    			case RTA_OIF:   
-	    		if_indextoname(*(int *)RTA_DATA(rtAttr), rtInfo->ifName);   
+	    		if_indextoname(*(int *)RTA_DATA(rtAttr), rtInfo.ifName);   
 	    		break;   
    			case RTA_GATEWAY:   
-	    		rtInfo->gateWay = *(u_int *)RTA_DATA(rtAttr);   
+	    		rtInfo.gateWay = *(uint32_t *)RTA_DATA(rtAttr);   
 	    		break;   
    			case RTA_PREFSRC:   
-	    		rtInfo->srcAddr = *(u_int *)RTA_DATA(rtAttr);   
+	    		rtInfo.srcAddr = *(uint32_t *)RTA_DATA(rtAttr);   
 	    		break;   
    			case RTA_DST:   
-	    		rtInfo->dstAddr = *(u_int *)RTA_DATA(rtAttr);   
+	    		rtInfo.dstAddr = *(uint32_t *)RTA_DATA(rtAttr);   
 	    		break;   
    		}   
 	}     
-	inet_ntop(AF_INET, &rtInfo->dstAddr, dst_address, MAX_STR_LEN);
+	inet_ntop(AF_INET, &rtInfo.dstAddr, dst_address, MAX_STR_LEN);
 	if (strstr(dst_address, "0.0.0.0"))
   	{        
-		inet_ntop(AF_INET, &rtInfo->gateWay, gateway, len);
+		inet_ntop(AF_INET, &rtInfo.gateWay, gateway, len);
    		//printf("%s\n",gateway);     
   	}   
 
   	return;   
 }   
 
-int get_gateway(char *gateway, unsigned int length)//传入长度
+int get_gateway(char *gateway, unsigned int length)
 {   
 	struct nlmsghdr *nlMsg = NULL;      
- 	struct route_info *rtInfo = NULL;   
  	char msgBuf[BUFSIZE] = "";       
  	int sock, len, msgSeq = 0;   
 
  	if((sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE)) < 0)   
  	{   
-  		printf("socket creation error!\n");   
+		MESA_handle_runtime_log(error_log_handler, RLOG_LV_FATAL, module_name, "socket create error.");
+		printf("====line:%d,%s\n",__LINE__,"socket create error.");
   		return -1;   
  	}   
 
- 	memset(msgBuf, 0, BUFSIZE);   
+ 	//memset(msgBuf, 0, BUFSIZE);   
  	nlMsg = (struct nlmsghdr *)msgBuf;
  	nlMsg->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); // Length of message.   
  	nlMsg->nlmsg_type = RTM_GETROUTE; // Get the routes from kernel routing table   
@@ -265,23 +276,22 @@ int get_gateway(char *gateway, unsigned int length)//传入长度
 
  	if(send(sock, nlMsg, nlMsg->nlmsg_len, 0) < 0)
 	{   
-  		printf("Write To Socket Failed…\n");
+		MESA_handle_runtime_log(error_log_handler, RLOG_LV_FATAL, module_name, "write to socket failed.");
+		printf("====line:%d,%s\n",__LINE__,"write to socket failed.");
 		goto OUT;  
 	}   
 
  	if((len = readNlSock(sock, msgBuf, msgSeq, getpid())) < 0) 
 	{   
-	  	printf("Read From Socket Failed…\n");   
+		MESA_handle_runtime_log(error_log_handler, RLOG_LV_FATAL, module_name, "read from socket failed.");
+		printf("====line:%d,%s\n",__LINE__,"read from socket failed.");
 		goto OUT;  
  	}   
   
- 	rtInfo = (struct route_info *)malloc(sizeof(struct route_info));   
  	for(;NLMSG_OK(nlMsg,len);nlMsg = NLMSG_NEXT(nlMsg,len))
 	{   
-  		memset(rtInfo, 0, sizeof(struct route_info));   
+  		parseRoutes(nlMsg, gateway, length);   
-  		parseRoutes(nlMsg, rtInfo,gateway, length);   
  	}   
- 	free(rtInfo);
 
 OUT:
  	close(sock);   
@@ -459,7 +469,7 @@ int http_check_init()
 	MESA_load_profile_string_nodef(http_check_conf_file, "HTTP", "HTTP_CHECK_ERR_LOG_PATH", http_check_error_log_path, MAX_STR_LEN);
 	MESA_load_profile_string_nodef(http_check_conf_file, "HTTP", "MODULE_NAME", module_name, MAX_STR_LEN);
 	MESA_load_profile_int_def(http_check_conf_file, "HTTP", "LOG_LEVEL", &log_level, 30);
-	printf("*v22*******read_ip:%s,read_port:%d\n",g_http_address, g_http_port);
+	printf("*v6*******read_ip:%s,read_port:%d\n",g_http_address, g_http_port);
 
 	http_check_log_handler = MESA_create_runtime_log_handle(http_check_log_path, RLOG_LV_INFO);
 	error_log_handler = MESA_create_runtime_log_handle(http_check_error_log_path, log_level);