本文共 1932 字,大约阅读时间需要 6 分钟。
服务端程序:
#include启动它。#include #include #include #include #include #include #include #include #include #include #include #include #include #include int main(){ int sockSrv = socket(AF_INET, SOCK_STREAM, 0); struct sockaddr_in addrSrv; addrSrv.sin_family = AF_INET; addrSrv.sin_addr.s_addr = INADDR_ANY; addrSrv.sin_port = htons(8765); bind(sockSrv, (const struct sockaddr *)&addrSrv, sizeof(struct sockaddr_in)); listen(sockSrv, 5); struct sockaddr_in addrClient; int len = sizeof(struct sockaddr_in); int sockConn = accept(sockSrv, (struct sockaddr *)&addrClient, (socklen_t*)&len); while(1) { getchar(); char szRecvBuf[50001] = {0}; int iRet = recv(sockConn, szRecvBuf, sizeof(szRecvBuf) - 1, 0); printf("iRet is %d\n", iRet); } close(sockConn); close(sockSrv); return 0;}
客户端程序:
#include启动它, 一直发送且服务端不recv数据, 此时客户端的内核缓冲区填满, send阻塞, ctrl c杀死进程, 此时客户端socket处于FIN_WAIT1状态。 客户端tcpdump抓包看不到FIN包和RST包, 而且服务端的socket也依然是ESTABLISHED的状态。#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include int main(){ int sockClient = socket(AF_INET, SOCK_STREAM, 0); struct sockaddr_in addrSrv; addrSrv.sin_addr.s_addr = inet_addr("10.100.70.140"); addrSrv.sin_family = AF_INET; addrSrv.sin_port = htons(8765); connect(sockClient, ( const struct sockaddr *)&addrSrv, sizeof(struct sockaddr_in)); #define N 2000 char szSendBuf[N] = {0}; for(unsigned int i = 0; i < N; i++) //字符数组最后一个字符不要求是‘\0’ { szSendBuf[i] = 'a'; } int total = 0; while(1) { int iRet = send(sockClient, szSendBuf, sizeof(szSendBuf) , 0); total += iRet; printf("iRet is %d, total send is %d\n", iRet, total); getchar(); } close(sockClient); return 0;}
这个问题非常有意思, 其实客户端是发了FIN包的, 至于为什么tcpdump抓不到包, 且服务端socket状态没有变化(无感知), 大家可以思考一下。
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