The simplest network communication for Linux

Server-Side

/* Socket Server * 2014-12-15 CopyRight (c) arbboter */#include <unistd.h> #include <stdio.h> #include <stdl ib.h> #include <time.h> #include <sys/socket.h> #include <sys/types.h> #include <netdb.h>#    Include <string.h> #include <arpa/inet.h>int main () {int sockfd_server;    int sockfd_client;    struct sockaddr_in addr_server;    struct sockaddr_in addr_client;    socklen_t Addr_len = 0;    int Client_max = 10;    int server_port = 33892;        Srand (Time (NULL));    Create Socket Sockfd_server = socket (af_inet, sock_stream, 0);        if (Sockfd_server = =-1) {printf ("init socket failed\n");    return-1;    }//Set address memset (&addr_server, 0, sizeof (addr_server));    addr_server.sin_family = af_inet;    ADDR_SERVER.SIN_ADDR.S_ADDR = htonl (Inaddr_any);        Addr_server.sin_port = htons (Server_port); Socket bind with Address if (bind (sockfd_server, struct sockaddr*) &addr_server, sizeof (structSOCKADDR)) = =-1) {printf ("bind socket failed\n");    return-1; }//server socket start list, waitting client to connect//This client_max refers to the simultaneous connection number if (Listen (Sockfd_server, Client_        max) = =-1) {printf ("Start listen socket failed\n");    return-1;    } char szmsg[128] = {0};        while (1) {addr_len = sizeof (struct sockaddr_in);                printf ("Waitting for connected...\n");         Waitting for Connected sockfd_client = Accept (Sockfd_server, (struct sockaddr*) &addr_client, &addr_len);            if (sockfd_client = =-1) {printf ("Accept socket failed\n");        return-1; }//Get client IP and send a magic number to the client,//Then close this connection Prin        TF ("recived connection from:%s\n", Inet_ntoa (ADDR_CLIENT.SIN_ADDR));        sprintf (szmsg, "Your magic number is:%d", rand ()%100);        Write (Sockfd_client, szmsg, strlen (szmsg)); CloseSockfd_client);    } close (Sockfd_server); return 0;}

Client

/* Socket client * 2014-12-15 CopyRight (c) arbboter */#include <unistd.h> #include <stdio.h> #include <stdl ib.h> #include <sys/socket.h> #include <sys/types.h> #include <netdb.h> #include <string.h>    #include <arpa/inet.h>int main () {int sockfd_server;    struct sockaddr_in addr_server;    socklen_t Addr_len = 0;    int server_port = 33891;    char* server_addr = "192.168.2.200";    Create Socket Sockfd_server = socket (af_inet, sock_stream, 0);        if (Sockfd_server = =-1) {printf ("init socket failed\n");    return-1;    }//Set server address memset (&addr_server, 0, sizeof (addr_server));    addr_server.sin_family = af_inet;    ADDR_SERVER.SIN_ADDR.S_ADDR = inet_addr (server_addr);;        Addr_server.sin_port = htons (Server_port);        Connect server if (connect (sockfd_server, (struct sockaddr *) &addr_server,sizeof (struct sockaddr)) ==-1) {        printf ("Connect server failed\n"); return-1;   } char szbuf[512] = {0};        int nread = 0;    recived data from server and print it nread = Read (Sockfd_server, szbuf, sizeof (SZBUF));            printf ("recived from server:%s\n", szbuf);    Close (Sockfd_server); return 0;}

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The simplest network communication for Linux