tcp客户端示例
#include <errno.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <stdlib.h> #include <string.h> #include <netinet/in.h> #include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> typedef struct _NSS_header { unsigned short ProtocolVersion; /* 协议版本信息 */ unsigned short MsgType; /* 消息类型 */ unsigned short TransactionNo; /* 传输编号 */ unsigned short PacketLength; /* 数据包长度,包括header */ }NSS_header; int str_echo(int sockfd,unsigned short no) { ssize_t readLen; ssize_t writeLen; char buf[8]; NSS_header *hdr = (NSS_header*)buf; memset( hdr,sizeof(NSS_header) ); hdr->TransactionNo = no; // 写数据 int nWriteLen = 0; while ( true ) { writeLen = write(sockfd,&buf[nWriteLen],sizeof(NSS_header)-nWriteLen); // printf( "write %d/n",writeLen); if (writeLen < 0 && errno == EINTR) { continue; } else if ( writeLen < 0 ) { perror ( "write:" ); return -1; } nWriteLen += writeLen; // 已写完,直接返回 if (nWriteLen >= sizeof(NSS_header) ) { break; } } printf( "send data successed. trans no: %d/n",no ); // 读数据 int nReadLen = 8; while ( true ) { readLen = read(sockfd,buf,nReadLen); // printf( "read: %d/n",readLen ); if (readLen < 0 && errno == EINTR) { continue; } else if ( readLen <= 0 ) { perror( "read:"); return -1; } else { nReadLen -= readLen; if (nReadLen <= 0 ) { break; } } } printf( "read response successed./n" ); return 0; } int main(int argc,char **argv) { printf("clIEnt ip: %s/n",argv[1]); printf("clIEnt port: %s/n",argv[2]); printf("server ip: %s/n",argv[3]); printf("server port: %s/n",argv[4]); printf("/n service starting.../n/n"); while( true ) { int socketFd; struct sockaddr_in svrAddr; struct sockaddr_in localAddr; socketFd = socket (AF_INET,SOCK_STREAM,0); if ( -1 == socketFd ) { perror( "socket:" ); continue; } // 设置地址可复用 int option = 1; setsockopt( socketFd,Sol_SOCKET,SO_REUSEADDR,&option,sizeof(option) ); // 客户端IP memset(&localAddr,sizeof(localAddr)); localAddr.sin_family = AF_INET; localAddr.sin_addr.s_addr = inet_addr( argv[1]); localAddr.sin_port = htons (atoi(argv[2])); int bindResult = bind(socketFd,(struct sockaddr *) &localAddr,sizeof(localAddr)); if ( -1 == bindResult ) { perror( "bind:" ); sleep(10); close(socketFd); continue; } // 服务器IP memset(&svrAddr,sizeof(svrAddr)); svrAddr.sin_family = AF_INET; svrAddr.sin_addr.s_addr = inet_addr( argv[3]); svrAddr.sin_port = htons (atoi(argv[4])); // 不断重连 int connResult = connect(socketFd,(struct sockaddr *) &svrAddr,sizeof(svrAddr)); if ( -1 == connResult ) { perror( "connect:" ); sleep(10); close(socketFd); continue; } printf (" connect %s:%s successed./n",argv[3],argv[4] ); static unsigned short no = 0; // 连接成功,每分钟发送一次数据 for ( ; ; ) { if ( -1 == str_echo(socketFd,no++) ) { break; } sleep( 60 ); } close(socketFd); } }
tcp服务器源码示例
#include <errno.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <stdlib.h> #include <string.h> #include <netinet/in.h> #include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> struct _NSS_header { unsigned short ProtocolVersion; /* 协议版本信息 */ unsigned short MsgType; /* 消息类型 */ unsigned short TransactionNo; /* 传输编号 */ unsigned short PacketLength; /* 数据包长度,包括header */ }NSS_header; voID str_echo(int sockfd) { ssize_t readLen; ssize_t writeLen; char buf[8]; while ( true ) { readLen = read(sockfd,8); if (readLen < 0 && errno == EINTR) { continue; } else if ( readLen <= 0 ) { perror( "read:"); return ; } printf( "recv data successed. data len: %d/n",readLen ); int nWriteLen = 0; while ( true ) { writeLen == write(sockfd,readLen-nWriteLen); if (writeLen < 0 && errno == EINTR) { continue; } else if ( writeLen < 0 ) { perror ( "write:" ); return; } nWriteLen += writeLen; // 已写完,直接返回 if (nWriteLen >= readLen ) { break; } } printf( "send data successed. data len: %d/n",readLen ); } } int main(int argc,char **argv) { printf( "server ip: %s/n",argv[1] ); printf( "server port: %s/n",argv[2] ); printf( "/nservice starting ... /n/n" ); int Listenfd,connfd; pID_t childpID; socklen_t clilen; struct sockaddr_in cliaddr,servaddr; Listenfd = socket (AF_INET,0); if ( -1 == Listenfd ) { perror( "socket:" ); exit(-1); } // 设置地址可复用 int option = 1; setsockopt( Listenfd,sizeof(option) ); memset(&servaddr,sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = inet_addr( argv[1]); servaddr.sin_port = htons (atoi(argv[2])); int bindResult = bind(Listenfd,(struct sockaddr *) &servaddr,sizeof(servaddr)); if ( -1 == bindResult ) { perror( "bind:" ); exit(-1); } int ListenResult = Listen(Listenfd,5); if ( -1 == ListenResult ) { perror( "Listen:" ); exit(-1); } for ( ; ; ) { clilen = sizeof(cliaddr); connfd = accept(Listenfd,(struct sockaddr *) &cliaddr,&clilen); if ( -1 == connfd ) { perror( "accept:" ); continue; } printf ("accept %s successed.fd: %d/n",inet_ntoa(cliaddr.sin_addr),connfd ); if ( (childpID = fork()) == 0) { /* child process */ close(Listenfd); /* close Listening socket */ str_echo(connfd); /* process the request */ printf ("disconnect from %d ./n",connfd ); exit (0); } } close(connfd); /* parent closes connected socket */ }总结
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