Linux网络编程之UDP编程,客户端标准输入给服务器端

11_server_udp.c

/*Linux网络编程之UDP编程服务器端*/#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <strings.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/ip.h>#include <netinet/in.h>#define SER_PORT 9999#define SER_IP "192.168.7.115"void sys_error(char *ch){    perror(ch);    exit(1);}int main(void){    int serfd,ret;    char buf[BUFSIZ];    //1.建立数据报套接字    if((serfd=socket(AF_INET,SOCK_DGRAM,0)) < 0)        sys_error("socket failed");    //2.绑定本地ip和端口    struct sockaddr_in ser;    bzero(&ser,sizeof(ser));    ser.sin_family = AF_INET;    ser.sin_port = htons(SER_PORT);    ser.sin_addr.s_addr = inet_addr(SER_IP);    ret = bind(serfd,(struct sockaddr *)&ser,sizeof(ser));    if(ret < 0)        sys_error("bind failed");    printf("bind ok\n");        //3.接收数据    while(1)    {        bzero(buf,BUFSIZ);        ret=recvfrom(serfd,buf,BUFSIZ,0,NULL,NULL);        if(ret < 0)            sys_error("recvfrom failed");        if(!strncmp(buf,"quit",4))            break;        printf("client send buf:%s",buf);    }    return 0;}/*$ ./11_server_udpbind okclient send buf:woooooclient send buf:066666*/

11_client_udp.c

/*Linux网络编程之UDP编程,标准输入给服务器端客户端*//*--->inet_aton( )        只能转IPV4所有地址    将strptr所指的字符串转换成32位的网络字节序二进制值    #include <arpa/inet.h>    int   inet_aton(const char *strptr, struct in_addr *addrptr);    2.//通用地址结构             struct sockaddr {               sa_family_t sa_family;//地址族，AF_xxx               char        sa_data[14];//14字节协议地址           } 3.//Internet协议地址结构(一般用这个)    struct sockaddr_in      {                      u_short sin_family;      // 地址族, AF_INET，2 bytes           u_short sin_port;      // 端口，2 bytes           struct in_addr sin_addr;  // IPV4地址，4 bytes             char sin_zero[8];        // 8 bytes unused，作为填充      }; 4.//IP地址的转换    inet_addr( )    将strptr所指的字符串转换成32位的网络字节序二进制值，返回转换后的地址。    int_addr_t   inet_addr(const char *strptr); 5.//IPv4地址结构    // internet address      struct in_addr    {         in_addr_t  s_addr;            // u32 network address     }; 6.ssize_t sendto(int socket, const void *message, size_t length,              int flags, const struct sockaddr *dest_addr,              socklen_t dest_len);    参数1：文件描述符    参数2：发送的缓冲区    参数3：缓存区长度    参数4：一般填0    参数5：结构体信息    参数6：结构体长度*/#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <strings.h>#include <sys/socket.h>#include <sys/types.h>#include <netinet/in.h>#include <netinet/ip.h>#define SER_PORT 9999#define SER_IP "192.168.7.115"void sys_error(char *ch){    perror(ch);    exit(1);}int main(void){    int clifd,ret;    char buf[BUFSIZ];    //1.建立数据报套接字    clifd=socket(AF_INET,SOCK_DGRAM,0);    if(clifd < 0)        sys_error("socket failed");    //2.发送数据    struct sockaddr_in cli;    bzero(&cli,sizeof(cli));    cli.sin_family = AF_INET;//选择IPV4    cli.sin_port = htons(SER_PORT);//填充端口    inet_aton(SER_IP,&cli.sin_addr.s_addr);//填充ip地址    while(1)    {        bzero(buf,BUFSIZ);        fgets(buf,BUFSIZ,stdin);        ret=sendto(clifd,buf,BUFSIZ,0,(struct sockaddr *)&cli,sizeof(cli));        if(ret < 0)            sys_error("sendto failed");        if(!strncmp(buf,"quit",4))              break;    }    return 0;}/*$ ./11_client_udpwooooo066666quit*/