请教为什么“setsockopt(s,SOL_SOCKET,SO_RCVTIMEO, (char *)&nRecvTimeOut, ...)”不管用！！！

舟中夜起 2001-06-20 02:23:00

我现在自己来设定为非阻塞模式的方法，然后自己计算超时可以搞定，但是不明白用setsockopt为什么就不行，msdn明明说明支持的啊！！！

大师可否告知。。。

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舟中夜起 2001-09-09

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BTW: int timeout

舟中夜起 2001-09-09

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timeout = 5000;//ms
nRet = setsockopt(s,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout, sizeof(timeout));

jianweiweng 2001-09-08

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如何触发超时机制呢？

舟中夜起 2001-06-21

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查一下microsoft站点，里面对此有详细说明

舟中夜起 2001-06-21

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你看msdn中的ping例子，里面就没有设置重叠方式

gPolaris 2001-06-21

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这可不是BUG，socket默认是重叠方式，而用WSASocket必须自己指定参数，
怎么能说是WSASocket的bug呢？用法而已

重叠socket不在乎该socket是阻塞还是不阻塞的（Blocking），也就是overlap与blocking无关，你要设置超时，只有重叠socket支持这个功能，所以就会出现才开始的情况

舟中夜起 2001-06-21

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舟中夜起 2001-06-20

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请教overlapped和阻塞的区别是什么？难道就是两种不同的定义？谢谢

kock 2001-06-20

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socket() 默认是OVERLAP的,见其帮助.

舟中夜起 2001-06-20

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找到原因了，这是WSASocket的一个bug,如要设置timeout,必须把最后一个参数设置为
WSA_FLAG_OVERLAPPED

唉，没想到platform sdk的例程也有错误。

BTW:目前网络上的ping例子都有类似错误

舟中夜起 2001-06-20

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我把WSASocket (AF_INET,SOCK_RAW,IPPROTO_ICMP,NULL, 0,0)
换成
socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);

就可以，但是为什么？

lts 2001-06-20

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怎么不管用，
我的程序里就是这样写的
int timeout = 150000;
setsockopt(m_hSocket,SOL_SOCKET,SO_RCVTIMEO,(char *)&timeout,sizeof(int));
就有用。

// ping.cpp : Defines the entry point for the console application. // #pragma pack(4) #include "winsock2.h" #include "stdlib.h" #include "stdio.h" #define ICMP_ECHO 8 #define ICMP_ECHOREPLY 0 #define ICMP_MIN 8 // minimum 8 byte icmp packet (just header) /* The IP header */ typedef struct iphdr { unsigned int h_len:4; // length of the header unsigned int version:4; // Version of IP unsigned char tos; // Type of service unsigned short total_len; // total length of the packet unsigned short ident; // unique identifier unsigned short frag_and_flags; // flags unsigned char ttl; unsigned char proto; // protocol (TCP, UDP etc) unsigned short checksum; // IP checksum unsigned int sourceIP; unsigned int destIP; }IpHeader; // // ICMP header // typedef struct icmphdr { BYTE i_type; BYTE i_code; /* type sub code */ USHORT i_cksum; USHORT i_id; USHORT i_seq; /* This is not the std header, but we reserve space for time */ ULONG timestamp; }IcmpHeader; #define STATUS_FAILED 0xFFFF #define DEF_PACKET_SIZE 32 #define DEF_PACKET_NUMBER 4 /* 发送数据报的个数 */ #define MAX_PACKET 1024 #define xmalloc(s) HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,(s)) #define xfree(p) HeapFree (GetProcessHeap(),0,(p)) void fill_icmp_data(char *, int); USHORT checksum(USHORT *, int); int decode_resp(char *,int ,struct sockaddr_in *); void Usage(char *progname){ fprintf(stderr,"Usage:\n"); fprintf(stderr,"%s [number of packets] [data_size]\n",progname); fprintf(stderr,"datasize can be up to 1Kb\n"); ExitProcess(STATUS_FAILED); } int main(int argc, char **argv){ WSADATA wsaData; SOCKET sockRaw; struct sockaddr_in dest,from; struct hostent * hp; int bread,datasize,times; int fromlen = sizeof(from); int timeout = 1000; int statistic = 0; /* 用于统计结果 */ char *dest_ip; char *icmp_data; char *recvbuf; unsigned int addr=0; USHORT seq_no = 0; if (WSAStartup(MAKEWORD(2,1),&wsaData) != 0){ fprintf(stderr,"WSAStartup failed: %d\n",GetLastError()); ExitProcess(STATUS_FAILED); } if (argc <2 ) { Usage(argv[0]); } sockRaw = WSASocket(AF_INET,SOCK_RAW,IPPROTO_ICMP,NULL, 0,WSA_FLAG_OVERLAPPED); // //注：为了使用发送接收超时设置(即设置SO_RCVTIMEO, SO_SNDTIMEO)， // 必须将标志位设为WSA_FLAG_OVERLAPPED ! // if (sockRaw == INVALID_SOCKET) { fprintf(stderr,"WSASocket() failed: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } bread = setsockopt(sockRaw,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout, sizeof(timeout)); if(bread == SOCKET_ERROR) { fprintf(stderr,"failed to set recv timeout: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } timeout = 1000; bread = setsockopt(sockRaw,SOL_SOCKET,SO_SNDTIMEO,(char*)&timeout, sizeof(timeout)); if(bread == SOCKET_ERROR) { fprintf(stderr,"failed to set send timeout: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } memset(&dest,0,sizeof(dest)); hp = gethostbyname(argv[1]); if (!hp){ addr = inet_addr(argv[1]); } if ((!hp) && (addr == INADDR_NONE) ) { fprintf(stderr,"Unable to resolve %s\n",argv[1]); ExitProcess(STATUS_FAILED); } if (hp != NULL) memcpy(&(dest.sin_addr),hp->h_addr,hp->h_length); else dest.sin_addr.s_addr = addr; if (hp) dest.sin_family = hp->h_addrtype; else dest.sin_family = AF_INET; dest_ip = inet_ntoa(dest.sin_addr); // // atoi函数原型是: int atoi( const char *string ); // The return value is 0 if the input cannot be converted to an integer ! // if(argc>2) { times=atoi(argv[2]); if(times == 0) times=DEF_PACKET_NUMBER; } else times=DEF_PACKET_NUMBER; if (argc >3) { datasize = atoi(argv[3]); if (datasize == 0) datasize = DEF_PACKET_SIZE; if (datasize >1024) /* 用户给出的数据包大小太大 */ { fprintf(stderr,"WARNING : data_size is too large !\n"); datasize = DEF_PACKET_SIZE; } } else datasize = DEF_PACKET_SIZE; datasize += sizeof(IcmpHeader); icmp_data = (char*)xmalloc(MAX_PACKET); recvbuf = (char*)xmalloc(MAX_PACKET); if (!icmp_data) { fprintf(stderr,"HeapAlloc failed %d\n",GetLastError()); ExitProcess(STATUS_FAILED); } memset(icmp_data,0,MAX_PACKET); fill_icmp_data(icmp_data,datasize); // //显示提示信息 // fprintf(stdout,"\nPinging %s ....\n\n",dest_ip); for(int i=0;i<times;i++){ int bwrote; ((IcmpHeader*)icmp_data)->i_cksum = 0; ((IcmpHeader*)icmp_data)->timestamp = GetTickCount(); ((IcmpHeader*)icmp_data)->i_seq = seq_no++; ((IcmpHeader*)icmp_data)->i_cksum = checksum((USHORT*)icmp_data,datasize); bwrote = sendto(sockRaw,icmp_data,datasize,0,(struct sockaddr*)&dest,sizeof(dest)); if (bwrote == SOCKET_ERROR){ if (WSAGetLastError() == WSAETIMEDOUT) { printf("Request timed out.\n"); continue; } fprintf(stderr,"sendto failed: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } if (bwrote < datasize ) { fprintf(stdout,"Wrote %d bytes\n",bwrote); } bread = recvfrom(sockRaw,recvbuf,MAX_PACKET,0,(struct sockaddr*)&from,&fromlen); if (bread == SOCKET_ERROR){ if (WSAGetLastError() == WSAETIMEDOUT) { printf("Request timed out.\n"); continue; } fprintf(stderr,"recvfrom failed: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } if(!decode_resp(recvbuf,bread,&from)) statistic++; /* 成功接收的数目++ */ Sleep(1000); } /* Display the statistic result */ fprintf(stdout,"\nPing statistics for %s \n",dest_ip); fprintf(stdout," Packets: Sent = %d,Received = %d, Lost = %d (%2.0f%% loss)\n",times, statistic,(times-statistic),(float)(times-statistic)/times*100); WSACleanup(); return 0; } /* The response is an IP packet. We must decode the IP header to locate the ICMP data */ int decode_resp(char *buf, int bytes,struct sockaddr_in *from) { IpHeader *iphdr; IcmpHeader *icmphdr; unsigned short iphdrlen; iphdr = (IpHeader *)buf; iphdrlen = (iphdr->h_len) * 4 ; // number of 32-bit words *4 = bytes if (bytes < iphdrlen + ICMP_MIN) { printf("Too few bytes from %s\n",inet_ntoa(from->sin_addr)); } icmphdr = (IcmpHeader*)(buf + iphdrlen); if (icmphdr->i_type != ICMP_ECHOREPLY) { fprintf(stderr,"non-echo type %d recvd\n",icmphdr->i_type); return 1; } if (icmphdr->i_id != (USHORT)GetCurrentProcessId()) { fprintf(stderr,"someone else''s packet!\n"); return 1; } printf("%d bytes from %s:",bytes, inet_ntoa(from->sin_addr)); printf(" icmp_seq = %d. ",icmphdr->i_seq); printf(" time: %d ms ",GetTickCount()-icmphdr->timestamp); printf("\n"); return 0; } USHORT checksum(USHORT *buffer, int size) { unsigned long cksum=0; while(size >1) { cksum+=*buffer++; size -=sizeof(USHORT); } if(size) { cksum += *(UCHAR*)buffer; } cksum = (cksum >> 16) + (cksum & 0xffff); cksum += (cksum >>16); return (USHORT)(~cksum); } /* Helper function to fill in various stuff in our ICMP request. */ void fill_icmp_data(char * icmp_data, int datasize){ IcmpHeader *icmp_hdr; char *datapart; icmp_hdr = (IcmpHeader*)icmp_data; icmp_hdr->i_type = ICMP_ECHO; icmp_hdr->i_code = 0; icmp_hdr->i_id = (USHORT)GetCurrentProcessId(); icmp_hdr->i_cksum = 0; icmp_hdr->i_seq = 0; datapart = icmp_data + sizeof(IcmpHeader); // // Place some junk in the buffer. // memset(datapart,''E'', datasize - sizeof(IcmpHeader)); }

#pragma pack(4) //#include "stdafx.h" #pragma comment (lib,"Ws2_32.lib") #define WIN32_LEAN_AND_MEAN #include #include #include #include #include #include #include typedef struct iphdr { unsigned int headlen:4; unsigned int version:4; unsigned char tos; unsigned short totallen; unsigned short id; unsigned short falg; unsigned char ttl; unsigned char prot; unsigned short checksum; unsigned int sourceIP; unsigned int destIP; }IpHeader; typedef struct icmphdr { BYTE type; BYTE code; USHORT checksum; USHORT id; USHORT seg; }IcmpHeader; #define ICMP_RCHO 8 #define ICMP_RCHO_REPLY 0 #define ICMP_MIN 8 #define STATUS_FAILED 0xFFFF #define DEF_PACKET_SIZE 32 #define MAX_PACKET 1024 #define MAX_PING_PACKET_SIZE (MAX_PACKET+sizeof(IpHeader)) void fill_icmp_data(char *,int); USHORT checksum(USHORT *,int); void decode_resp(char *,int,struct sockaddr_in *); DWORD WINAPI FindIP(LPVOID pIPAddrTemp); WSADATA wsaData; SOCKET sockRaw; struct sockaddr_in dest,from,end; int fromlen =sizeof(from); char *recvbuf=new char[MAX_PING_PACKET_SIZE]; unsigned int addr=0; long ThreadNumCounter=0,ThreadNumLimit=20; long *aa=&ThreadNumCounter; void main(int argc,char *argv[]) { /*if(argc!=3) { cout<<"输入格式错误: start_ip end_ip"<Socket(AF_INET,SOCK_RAW,IPPROTO_ICMP,NULL,0,WSA_FLAG_OVERLAPPED); if(sockRaw==INVALID_SOCKET) { cout<<"WASSocketet() falied"<timeout=1000; int bread=setsockopt(sockRaw,SOL_SOCKET,SO_RCVTIMEO,(char *)&timeout,sizeof(timeout)); if(bread==SOCKET_ERROR) { cout<<"FAILED TO SEY RECV TIMEOUT"<timeout=1000; bread=setsockopt(sockRaw,SOL_SOCKET,SO_SNDTIMEO,(char *)&timeout,sizeof(timeout)); if(bread==SOCKET_ERROR) { cout<<"FAILED TO SEY RECV TIMEOUT"<set(&dest,0,sizeof(dest)); unsigned long startIP,endIP; dest.sin_family=AF_INET; dest.sin_addr.s_addr=inet_addr(argv[1]); startIP=inet_addr(argv[1]); end.sin_family=AF_INET; end.sin_addr.s_addr=inet_addr(argv[2]); endIP=inet_addr(argv[2]); HANDLE hThread; while(htonl(startIP)ThreadNumLimit) { Sleep(5000); continue; } DWORD ThreadID; sockaddr_in *pIPAddrTemp=new (sockaddr_in); if(!pIPAddrTemp) { cout<<"memory alloc failed"<set(&from,0,sizeof(from)); startIP=htonl(htonl(startIP)+1); dest.sin_addr.s_addr=startIP; } while(ThreadNumCounter!=0) { Sleep(2000); return; cout<<"error"id=(USHORT)GetCurrentThreadId(); datapart=icmp_data+sizeof(IcmpHeader); memset(datapart,'A',datasize-sizeof(IcmpHeader)); } void decode_resp(char *buf,int bytes,struct sockaddr_in *from) { IpHeader *iphdr; IcmpHeader *icmphdr; unsigned short iphdrlen; iphdr=(IpHeader*) buf; iphdrlen=iphdr->headlen*4; icmphdr=(IcmpHeader *)(buf+iphdrlen); if(bytestype!=ICMP_RCHO_REPLY)return; if(icmphdr->id!=(USHORT)GetCurrentThreadId())return; cout<<"活动主机: "<CHAR*)buffer; } cksum=(cksum>>16)+(cksum& 0xffff); cksum+=(cksum>>16); return (USHORT)(~cksum); } DWORD WINAPI FindIP(LPVOID pIPAddrTemp) { InterlockedIncrement(aa); char icmp_data[MAX_PACKET]; memset(icmp_data,0,MAX_PACKET); int datasize=DEF_PACKET_SIZE; datasize+=sizeof(IcmpHeader); fill_icmp_data(icmp_data,datasize); ((IcmpHeader*)icmp_data)->checksum=0; ((IcmpHeader*)icmp_data)->seg=0; ((IcmpHeader*)icmp_data)->checksum=checksum((USHORT*)icmp_data,datasize); int bwrote=sendto(sockRaw,icmp_data,datasize,0,(struct sockaddr *)pIPAddrTemp,sizeof(dest)); int n=0; if(bwrote==SOCKET_ERROR) { if(WSAGetLastError()==WSAETIMEDOUT) { cout<<"timed out"<TIMEDOUT) { cout<<"timed out"<recvfrom(sockRaw,recvbuf,MAX_PING_PACKET_SIZE,0,(struct sockaddr *)&from,&fromlen); if(bread==SOCKET_ERROR) { if(WSAGetLastError()==WSAETIMEDOUT) { cout<<"timed out"<recvfrom falied"<recvbuf,bread,&from); InterlockedDecrement(aa); } return 0; }

本文实例讲述了C++设置超时时间的简单实现方法，代码简单易懂，功能实用。分享给大家供大家参考。具体实现方法如下：代码如下:BOOL SetTimeOut(SOCKET s, int nTime, BOOL bRecv) { int ret = ::setsockopt(s, SOL_SOCKET, bRecv?SO_RCVTIMEO:SO_SNDTIMEO, (char*)nTime, sizeof(nTime)); return ret!=SOCKET_ERROR; } 此处setsockopt为针对套接口的操作，感兴趣的朋友可以查阅相关资料做进一步了解。

UDP的socket在某些情况：如对方关闭时，本地可能sendto不出去数据，然后recvfrom就会被阻塞，这时就需要设置这两个参数的值提高程序质量。 linux: struct timeval timeout={3,0};//3s int ret=setsockopt(sock_fd,SOL_SOCKET,SO_SNDTIMEO,&timeout,sizeof(tim...

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