Socket本地通信和网络通信

Linux进程间通信方式–本地socket

服务端：

//s_unix.c#include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <sys/un.h> #define UNIX_DOMAIN "/tmp/UNIX.domain"int main(void){    socklen_t clt_addr_len;    int listen_fd;    int com_fd;    int ret;    int i;    static char recv_buf[1024];     int len;    struct sockaddr_un clt_addr;    struct sockaddr_un srv_addr;    listen_fd=socket(PF_UNIX,SOCK_STREAM,0);    if(listen_fd<0)    {        perror("cannot create communication socket");        return 1;    }      //set server addr_param    srv_addr.sun_family=AF_UNIX;    strncpy(srv_addr.sun_path,UNIX_DOMAIN,sizeof(srv_addr.sun_path)-1);    unlink(UNIX_DOMAIN);    //bind sockfd & addr    ret=bind(listen_fd,(struct sockaddr*)&srv_addr,sizeof(srv_addr));    if(ret==-1)    {        perror("cannot bind server socket");        close(listen_fd);        unlink(UNIX_DOMAIN);        return 1;    }    //listen sockfd     ret=listen(listen_fd,1);    if(ret==-1)    {        perror("cannot listen the client connect request");        close(listen_fd);        unlink(UNIX_DOMAIN);        return 1;    }    //have connect request use accept    len=sizeof(clt_addr);    com_fd=accept(listen_fd,(struct sockaddr*)&clt_addr,&len);    if(com_fd<0)    {        perror("cannot accept client connect request");        close(listen_fd);        unlink(UNIX_DOMAIN);        return 1;    }    //read and printf sent client info    printf("/n=====info=====/n");    for(i=0;i<4;i++)    {        memset(recv_buf,0,1024);        int num=read(com_fd,recv_buf,sizeof(recv_buf));        printf("Message from client (%d)) :%s/n",num,recv_buf);      }    close(com_fd);    close(listen_fd);    unlink(UNIX_DOMAIN);    return 0;}

客户端

//c_unix.c#include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <sys/un.h>#define UNIX_DOMAIN "/tmp/UNIX.domain"int main(void){    int connect_fd;    int ret;    char snd_buf[1024];    int i;    static struct sockaddr_un srv_addr;//creat unix socket    connect_fd=socket(PF_UNIX,SOCK_STREAM,0);    if(connect_fd<0)    {        perror("cannot create communication socket");        return 1;    }       srv_addr.sun_family=AF_UNIX;    strcpy(srv_addr.sun_path,UNIX_DOMAIN);//connect server    ret=connect(connect_fd,(struct sockaddr*)&srv_addr,sizeof(srv_addr));    if(ret==-1)    {        perror("cannot connect to the server");        close(connect_fd);        return 1;    }    memset(snd_buf,0,1024);    strcpy(snd_buf,"message from client");//send info server    for(i=0;i<4;i++)        write(connect_fd,snd_buf,sizeof(snd_buf));    close(connect_fd);

---

Socket 通信之网络通信

服务端

#include <stdio.h>#include <unistd.h>#include <string.h>#include <stdlib.h>#include <sys/types.h>          /* See NOTES */#include <sys/socket.h>#include <arpa/inet.h>#include <netinet/in.h>#define SIZE 100int main(int argc, char **argv){      int sock_fd;      struct sockaddr_in sin;      //创建套接字      if( (sock_fd = socket(AF_INET,SOCK_STREAM,0)) < 0){        perror("socket");        exit(1);      }      //填充地址      bzero(&sin,sizeof(sin));      sin.sin_family = AF_INET;      if(argc != 3){        sin.sin_port = htons(8888);        sin.sin_addr.s_addr = inet_addr("192.168.7.5");      }else{        sin.sin_port = htons(atoi(argv[1]));        sin.sin_addr.s_addr = inet_addr(argv[2]);      }      if(connect(sock_fd,(struct sockaddr*)&sin,sizeof(sin)) < 0){        perror("connect");        exit(1);      }      //和客户端进行通信      char buf[SIZE];      while(1){        fgets(buf,SIZE,stdin);        write(sock_fd,buf,strlen(buf));        if(strncmp(buf,"quit",4) == 0)          break;      }      close(sock_fd);      return 0;}

客户端

#include <stdio.h>#include <unistd.h>#include <string.h>#include <stdlib.h>#include <sys/types.h>          /* See NOTES */#include <sys/socket.h>#include <arpa/inet.h>#include <netinet/in.h>#define SIZE 100int main(int argc, char **argv){      int sock_fd,conn_fd;      struct sockaddr_in sin,cin;      //创建套接字      if( (sock_fd = socket(AF_INET,SOCK_STREAM,0)) < 0){        perror("socket");        exit(1);      }      //填充地址      bzero(&sin,sizeof(sin));      sin.sin_family = AF_INET;      if(argc != 3){        sin.sin_port = htons(8888);        sin.sin_addr.s_addr = inet_addr("192.168.7.5");      }else{        sin.sin_port = htons(atoi(argv[1]));        sin.sin_addr.s_addr = inet_addr(argv[2]);      }      //绑定地址      if(bind(sock_fd,(struct sockaddr*)&sin,sizeof(sin)) < 0){        perror("bind");        exit(1);      }      //监听套接字      if(listen(sock_fd,8) < 0){        perror("listen");        exit(1);      }      //等待接收链接,使进程阻塞，直到有新的客户端请求链接为止      bzero(&cin,sizeof(cin));      socklen_t len = sizeof(cin);      printf("listen....\n");      if( (conn_fd = accept(sock_fd,(struct sockaddr*)&cin,&len)) < 0){        perror("accept");        exit(1);      }      printf("客户端%s链接成功!\n",inet_ntoa(cin.sin_addr));      //和客户端进行通信      char buf[SIZE];      int ret;      while(1){        bzero(buf,SIZE);        if( (ret = read(conn_fd,buf,SIZE)) < 0){          perror("read");          exit(1);        }else if( ret == 0){          printf("客户端已断开\n");          break;        }else{          if(strncmp(buf,"quit",4) == 0)            break;          printf("%s",buf);        }      }      close(sock_fd);      close(conn_fd);      return 0;}