Streaming socket Client server-side code implementation based on Linux platform

(1) The server segment code is as follows:

#include <stdlib.h> #include <stdio.h> #include <unistd.h> #include <errno.h> #include < string.h> #include <netdb.h> #include <sys/types.h> #include <time.h> #include <sys/socket.h > #include <arpa/inet.h> #define BUFSIZE 512/* * ERROR report */static void bail (const char *on_what) {fputs (strerror (er    Rno), stderr);    Fputs (":", stderr);    Fputs (On_what, stderr);      FPUTC (' \ n ', stderr); Exit (1);}                  int main (int argc, char *argv[]) {int sockfd;                  /* Server sockets */int new_fd;  /* Server Connection Socket */struct sockaddr_in server_addr;  /* Server listener Socket */struct sockaddr_in client_addr;    /* Client IP Address */socklen_t size;    int portnumber;  Char Reqbuf[bufsize];   /* Apply Receive Cache */char dtfmt[bufsize];        /* Date-time result String */time_t TD;    /* Current date and time */struct TM TM;    /* Date Time structure body */int z;        if (argc! = 2) {fprintf (stderr, "Usage:%s portnumber\a\n", argv[0]); EXIT (1);        } if ((PortNumber = Atoi (argv[1)) <0) {fprintf (stderr, "Usage:%s portnumber\a\n", argv[0]);    Exit (1); }/* Create a Server listener socket */if ((SOCKFD = socket (pf_inet, sock_stream, 0)) = =-1) {fprintf (stderr, "Socket error:%s\a\        N ", Strerror (errno));    Exit (1);    */* Prepare the IP address and port for the listener socket */memset (&server_addr, 0, sizeof server_addr);    server_addr.sin_family = af_inet;     SERVER_ADDR.SIN_ADDR.S_ADDR = htonl (Inaddr_any);    Server_addr.sin_port = htons (portnumber); /* Bind the socket to the specified address and port */if (Bind (SOCKFD, (struct sockaddr *) (&AMP;SERVER_ADDR), sizeof SERVER_ADDR        ) = =-1) {fprintf (stderr, "Bind Error:%s\a\n", Strerror (errno));    Exit (1); }/* Monitor */if (listen (SOCKFD, +) = =-1) {fprintf (stderr, "Listen error:%s\n\a", S        Trerror (errno));    Exit (1);    } printf ("Waiting for the client ' s request...\n");  /* Server main loop processing */while (1) {      size = sizeof (struct sockaddr_in); /* Receive a client connection and create a server connection socket */if (NEW_FD = Accept (SOCKFD, (struct sockaddr *) (&AMP;CLIENT_ADDR), &A             mp;size)) = =-1) {fprintf (stderr, "Accept Error:%s\a\n", Strerror (errno));        Exit (1);        } fprintf (stdout, "Server got connection from%s\n", Inet_ntoa (CLIENT_ADDR.SIN_ADDR)); for (;;) {/* reads the datetime request from the client, if the client does not send the request, * The server will block */z = read (new_fd, Reqbuf, siz            EOF reqbuf);            if (Z < 0) bail ("read ()"); /* The server checks if the client has closed the socket, and the read operation * returns 0 (EOF).               If the client closes its socket, the server * will execute close to end this connection and then start receiving a connection request for the next client */if (z = = 0) {                Close (NEW_FD);            Break            }/* * Add a null character to the end of the request connection string to form the complete request day * Period Time String */reqbuf[z] = 0; /* * Get the current date and time of the server * * (&AMP;TD);            TM = *localtime (&AMP;TD);                /* * Generate an answer string based on the format string of the request date strings */strftime (DTFMT,/* Formatted results */sizeof DTFMT, REQBUF,/* Client request format string */&AMP;TM);/* Send formatting results to client */z = write (new_fd, DTF             MT, strlen (DTFMT));          if (Z < 0) bail ("write ()");     }          }            }

(2) Client code:

 #include <stdlib.h> #include <stdio.h> #include <errno.h> #include <string.h> #include < netdb.h> #include <sys/types.h> #include <sys/socket.h> #include <unistd.h> #include <arpa/     Inet.h> #define BUFSIZE-static void bail (const char *on_what) {fputs (Strerror (errno), stderr);     Fputs (":", stderr);     Fputs (On_what, stderr);    FPUTC (' \ n ', stderr); Exit (1);                             }int Main (int argc, char *argv[]) {int sockfd;    /* Client socket */char buf[bufsize];     struct sockaddr_in server_addr;    /* Server IP address */struct hostent *host;    int portnumber;    int nbytes;    int z;                 Char Reqbuf[bufsize]; /* Client Request format string */if (argc! = 3) {fprintf (stderr, "Usage:%s hostname portnumber\a\n", AR        Gv[0]);    Exit (1);       } if ((host = gethostbyname (argv[1)) = = NULL) {fprintf (stderr, "GetHostName error\n");    Exit (1); } if ((PortNumber = Atoi (argv[2])) < 0) {fprintf (stderr, "Usage:%s hostname portnumber\a\n", argv[0]);    Exit (1);                         }/* Create socket */if ((SOCKFD = socket (pf_inet, sock_stream, 0)) = =-1) {fprintf (stderr, "Socket Error:%s\a\n",        Strerror (errno));    Exit (1);    }/* Create server address */memset (&server_addr, 0, sizeof server_addr);    server_addr.sin_family = af_inet;    Server_addr.sin_port = htons (portnumber);    server_addr.sin_addr = * (struct in_addr *) host->h_addr); /* Linked server */if (connect (SOCKFD, struct sockaddr *) (&AMP;SERVER_ADDR), sizeof server_addr) = =-1) {fprintf        (stderr, "Connect Error:%s\a\n", Strerror (errno));    Exit (1);    } printf ("Connected to server%s\n", Inet_ntoa (SERVER_ADDR.SIN_ADDR)); /* * Client program main loop, enter ' quit ' to exit */for (;;) {/* Prompt for Date time format string */fputs ("\nenter format string (^d or ' quit ' to exit):", StdoUT);            if (!fgets (reqbuf, sizeof reqbuf, stdin)) {printf ("\ n");      Break        /* EOF */* * Add a null string as the end of the datetime request string, and also remove the trailing newline at the same time */z = strlen (reqbuf);        if (Z > 0 && reqbuf[--z] = = ' \ n ') reqbuf[z] = 0;        if (z = = 0)/* Client input entered enter */continue; /* * Enter quit Exit */if (!strcasecmp (Reqbuf, "quit")) {printf ("Press any key to end client.            \ n ");            GetChar ();        Break        }/* * Send date Time request string to server, note that the request message is stripped of the null character */z = write (sockfd, Reqbuf, strlen (REQBUF)); printf ("Client has sent??" %s??        To the sever\n ", reqbuf);        if (Z < 0) bail ("write ()"); /* * Read the server's reply from the client socket */if ((nbytes = Read (SOCKFD, buf, sizeof buf)) = =-1) {fprintf (s            Tderr, "Read Error:%s\n", Strerror (errno));        Exit (1);  }        /*      * If the server closes the link for one reason, the customer segment needs to handle this event */if (nbytes = = 0) {/*????           EOF */printf ("Server has closed the socket.\n");            printf ("Press any key to exit...\n");            GetChar ();        Break       } Buf[nbytes] = ' + ';            /* * Output Date Time results */printf ("Result from%s port%u: \n\t '%s ' \ n", Inet_ntoa (SERVER_ADDR.SIN_ADDR),   (unsigned) Ntohs (server_addr.sin_port), buf);   } close (SOCKFD); return 0;}

(3) Execution procedure

Streaming socket Client server-side code implementation based on Linux platform