C语言socket设置超时／setsockopt函数

2019-11-08 01:28:20

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／／=======================在Windows下似乎操作比较简单，直接调用winsock2.h和ws2_32.lib编程#include"stdafx.h"#include"stdio.h"#include "winsock2.h"#PRagmacomment(lib, "ws2_32.lib") 设置接收超时为 nNetTimeout可采用如下方法：int nNetTimeout= 2000ms;if (SOCKET_ERROR == setsockopt(serSocket,SOL_SOCKET, SO_RCVTIMEO, (char *)&nNetTimeout,sizeof(int))) { printf("Set Ser_RecTIMEO error !/r/n"); } int ret = recvfrom(serSocket, recvData, 255, 0, (sockaddr*)&remoteAddr, &nAddrLen); if(ret<0) { printf("recv timeout! %d/n",ret);//ret = -1 //continue; }设置接收超时成功后，若超时，返回值为ret = -1>>>>>>>>>>>>>>>>>>>>>>>>>>>>>linux<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<而Linux下则不太一样，timeout若仍采用int型将没有效果。linux下应将timeout类型改成struct timeval！注意符号：struct timevaltimeout={4,0};//即timeout={4,0};或者timeout.tv_sec=4; timeout.tv_usec=0;//设置接收超时//setsockopt(sockfd,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,sizeof(timeout));setsockopt(sockfd,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,sizeof(structtimeval));//同样接收超时后接收返回-1if((rec_length=recvfrom(sockfd,recbuf,MAXDATASIZE,0,(structsockaddr *)&peer,&addrlen))== -1){ printf("recvtimeout!/n");}／／======================

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