Hi
I am trying to create simple tcp client server architecture in which server
accepts client request and echoes the same line written by client.
this is my code
/*HELPER.H
========
Interface to socket helper functions.
Many of these functions are adapted from, inspired by, or
otherwise shamelessly plagiarised from "Unix Network
Programming", W Richard Stevens (Prentice Hall).
*/
#ifndef PG_SOCK_HELP
#define PG_SOCK_HELP
#include <unistd.h> /* for ssize_t data type */
#define LISTENQ (1024) /* Backlog for listen() */
/* Function declarations */
ssize_t Readline(int fd, void *vptr, size_t maxlen);
ssize_t Writeline(int fc, const void *vptr, size_t maxlen);
#endif /* PG_SOCK_HELP */
/*HELPER.C
========
Implementation of sockets helper functions.
Many of these functions are adapted from, inspired by, or
otherwise shamelessly plagiarised from "Unix Network
Programming", W Richard Stevens (Prentice Hall).
*/
#include "helper.h"
#include <winsock.h>
#include <unistd.h>
#include <errno.h>
#include <windows.h>
/* Read a line from a socket */
ssize_t Readline(int sockd, void *vptr, size_t maxlen) {
ssize_t n, rc;
char c, *buffer;
buffer = vptr;
for ( n = 1; n < maxlen; n++ ) {
if ( (rc = read(sockd, &c, 1)) == 1 ) {
*buffer++ = c;
if ( c == '\n' )
break;
}
else if ( rc == 0 ) {
if ( n == 1 )
return 0;
else
break;
}
else {
if ( errno == EINTR )
continue;
return -1;
}
}
*buffer = 0;
return n;
}
/* Write a line to a socket */
ssize_t Writeline(int sockd, const void *vptr, size_t n) {
size_t nleft;
ssize_t nwritten;
const char *buffer;
buffer = vptr;
nleft = n;
while ( nleft > 0 ) {
if ( (nwritten = write(sockd, buffer, nleft)) <= 0 ) {
if ( errno == EINTR )
nwritten = 0;
else
return -1;
}
nleft -= nwritten;
buffer += nwritten;
}
return n;
}
/*ECHOSERV.C
==========
Simple TCP/IP echo server.
*/
#include <winsock2.h> /* socket definitions */
#include <sys/types.h> /* socket types */
#include <windows.h> /* inet (3) funtions */
#include "helper.h" /* our own helper functions */
#include <stdlib.h>
#include <stdio.h>
/* Global constants */
#define ECHO_PORT (2002)
#define MAX_LINE (1000)
int main(int argc, char *argv[]) {
int list_s; /* listening socket */
int conn_s; /* connection socket */
short int port; /* port number */
struct sockaddr_in servaddr; /* socket address structure */
char buffer[MAX_LINE]; /* character buffer */
char *endptr; /* for strtol() */
/* Get port number from the command line, and
set to default port if no arguments were supplied */
if ( argc == 2 ) {
port = strtol(argv[1], &endptr, 0);
if ( *endptr ) {
fprintf(stderr, "ECHOSERV: Invalid port number.\n");
exit(EXIT_FAILURE);
}
}
else if ( argc < 2 ) {
port = ECHO_PORT;
}
else {
fprintf(stderr, "ECHOSERV: Invalid arguments.\n");
exit(EXIT_FAILURE);
}
/* Create the listening socket */
if ( (list_s = socket(AF_INET, SOCK_STREAM, 0)) < 0 ) {
fprintf(stderr, "ECHOSERV: Error creating listening socket.\n");
exit(EXIT_FAILURE);
}
/* Set all bytes in socket address structure to
zero, and fill in the relevant data members */
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(port);
/* Bind our socket addresss to the
listening socket, and call listen() */
if ( bind(list_s, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0 )
{
fprintf(stderr, "ECHOSERV: Error calling bind()\n");
exit(EXIT_FAILURE);
}
if ( listen(list_s, LISTENQ) < 0 ) {
fprintf(stderr, "ECHOSERV: Error calling listen()\n");
exit(EXIT_FAILURE);
}
/* Enter an infinite loop to respond
to client requests and echo input */
while ( 1 ) {
/* Wait for a connection, then accept() it */
if ( (conn_s = accept(list_s, NULL, NULL) ) < 0 ) {
fprintf(stderr, "ECHOSERV: Error calling accept()\n");
exit(EXIT_FAILURE);
}
/* Retrieve an input line from the connected socket
then simply write it back to the same socket. */
Readline(conn_s, buffer, MAX_LINE-1);
Writeline(conn_s, buffer, strlen(buffer));
/* Close the connected socket */
if ( close(conn_s) < 0 ) {
fprintf(stderr, "ECHOSERV: Error calling close()\n");
exit(EXIT_FAILURE);
}
}
}
My problem is i am getting an error of undefined reference to socket@12.....
i m running GCC on windows so if u have solution for this do write to me.
--
*Kind Regards
Parag Deshpande*
*Studioapp*
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