Linux网络编程之TCP编程,网络属性设置setsockopt,快速重启

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12_setsockopt_server.c

//Linux网络编程之TCP编程,网络属性设置setsockopt,快速重启//网络属性系统默认关闭/*-->为了通知套接口实现不要因为一个地址已被一个套接口使用就不让它与另一个套接口捆绑，应用程序可在bind()调用前先设置 SO_REUSEADDR 选项。int setsockopt(int socket, int level, int option_name,              const void *option_value, socklen_t option_len);-->int_addr_t   inet_addr(const char *strptr);    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。*/#include <stdio.h>#include <stdlib.h>#include <string.h>#include <strings.h>#include <unistd.h>#include <sys/types.h>#include <sys/socket.h>#include <arpa/inet.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){    char buf[128];    int serfd,ret;    //1.建立流式套接字    serfd = socket(AF_INET,SOCK_STREAM,0);    if(serfd < 0)        sys_error("socket failed");    //打开网络属性    int on=1;    //SO_REUSEADDR,s允许端口和地址重用    if(setsockopt(serfd,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on)) < 0)        sys_error("kuai su chong qi failed");    //2.绑定本地ip和端口    struct sockaddr_in ser;    bzero(&ser,sizeof(ser));    ser.sin_family = AF_INET;//选择IPV4    ser.sin_port = htons(SER_PORT);//填充端口    ser.sin_addr.s_addr = inet_addr(SER_IP);//填充IP    ret=bind(serfd,(struct sockaddr *)&ser,sizeof(ser));    if(ret < 0)        sys_error("bind failed");    //3.监听    ret=listen(serfd,5);    if(ret < 0)        sys_error("listen failed");    printf("listent ok\n");    //4.接收    struct sockaddr_in self;    bzero(&self,sizeof(self));    int len=sizeof(self);    int newfd;    newfd=accept(serfd,(struct sockaddr *)&self,&len);    if(newfd < 0)        sys_error("accept failed");    //5.读取数据    while(1)    {        bzero(buf,128);        ret=read(newfd,buf,128);        if(ret<0)            sys_error("read failed");        else if(ret == 0)        {            fprintf(stdout,"Bye-Bye\n");            break;        }        else            printf("buf from client:%s",buf);    }    //6.关闭    close(serfd);    close(newfd);    return 0;}

12_setsockopt_client.c

//Linux网络编程之TCP编程,网络属性设置//网络属性系统默认关闭#include <stdio.h>#include <stdlib.h>#include <string.h>#include <strings.h>#include <unistd.h>#include <sys/socket.h>#include <sys/types.h>#include <netinet/in.h>#include <arpa/inet.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[128];    //1.建立流式套接字    clifd=socket(AF_INET,SOCK_STREAM,0);    if(clifd < 0)        sys_error("socket failed");    //2.主动发起连接    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 = connect(clifd,(struct sockaddr *)&ser,sizeof(ser));    if(ret < 0)        sys_error("connect failed");    printf("connect ok\n");    //3.写数据    while(1)    {        bzero(buf,128);        fprintf(stderr,"please input:");        fgets(buf,128,stdin);        if(write(clifd,buf,strlen(buf)) < 0)            sys_error("write failed");        if(!strncmp(buf,"quit",4))            break;    }    //4.关闭    close(clifd);    return 0;}

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