Socket Programming Problem in C

[chellappa]

Hi Every body!,
i did a small Chat program in Linux C Socket Programm ... I am using
stdout/stdin i did in single machinee i will work properly..but i want
to run in differnet machine..i tried ,but its faliure... try to modify
this pgm run in differnt machine

Server Program
==============
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>

#define LISTENQ 100
#define SERV_PORT 9292

void err(char* str)
{
fprintf(stdout, str);
fflush(stdout);
exit(EXIT_FAILU RE);
}

void sendString(char * str)
{
fprintf(stdout, str);
fflush(stdout);
}

int main(int argc,char** argv)
{
int listenfd,connfd ;
socklen_t clilen;
struct sockaddr_in cliaddr,servadd r;
char msg[1024];
int nread;

if((listenfd=so cket(AF_INET,SO CK_STREAM,0))<0 )
err("Socket failed");

memset(&servadd r,0,sizeof(serv addr));
servaddr.sin_fa mily=AF_INET;
servaddr.sin_ad dr.s_addr=htonl (INADDR_ANY);
servaddr.sin_po rt=htons(SERV_P ORT);

if(bind(listenf d,(struct sockaddr*)&serv addr,sizeof(ser vaddr))<0)
err("Bind failed");

if(listen(liste nfd,LISTENQ)<0)
err("Listen failed");

for(;;)
{
clilen=sizeof(c liaddr);
connfd=accept(l istenfd,(struct sockaddr*)&clia ddr,&clilen);
sendString("New Client");
memset(msg,0,10 24);

while(1)
{
sendString("Per son (server) waiting : \n");
nread=read(conn fd,msg,sizeof(m sg));
msg[nread]=0;
fprintf(stdout, "Message %s",msg);
fflush(stdout);
sendString("Per son (server) Type the mess to be sent :");
fgets(msg,1024, stdin);
write(connfd,ms g,strlen(msg));
}
close(connfd);
}

}
Client Program
===========-===
#include <stdio.h>
#include <sys/socket.h>
#include <string.h>
#include <arpa/inet.h>
#include <stdlib.h>

#define SERV_PORT 9292

void err(char* str)
{
fprintf(stdout, str);
fflush(stdout);
exit(EXIT_FAILU RE);
}

void sendString(char * str)
{
fprintf(stdout, str);
fflush(stdout);
}

int main(int argc,char** argv)
{
int sockfd;
struct sockaddr_in servaddr;
char msg[1024];
int nread;

if((sockfd=sock et(AF_INET,SOCK _STREAM,0))<0)
err("Socket Failed");

memset(&servadd r,0,sizeof(serv addr));

servaddr.sin_fa mily=AF_INET;
servaddr.sin_po rt=htons(SERV_P ORT);
inet_pton(AF_IN ET,argv[1],&servaddr.sin_ addr);

connect(sockfd, (struct sockaddr*)&serv addr,sizeof(ser vaddr));

do
{
sendString("Per son (Client) Enter Message to be sent:");
fgets(msg,1024, stdin);
write(sockfd,ms g,strlen(msg));

sendString("Per son (Client) waiting...\n");
nread=read(sock fd,msg,sizeof(m sg));
msg[nread]=0;
fprintf(stdout, "%s\n",msg) ;
fflush(stdout);
}while(strlen(m sg)>1);
}

Thanks a lot

[Walter Roberson]

In article <11************ **********@g44g 2000cwa.googleg roups.com>,
chellappa <N.*********@gm ail.com> wrote:

i did a small Chat program in Linux C Socket Programm ... I am using
stdout/stdin i did in single machinee i will work properly..but i want
to run in differnet machine..i tried ,but its faliure... try to modify
this pgm run in differnt machine
Socket Programming and Linux are not considered appropriate topics
for this newsgroup.

Server Program
============ ==
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
sys/socket.h and arpa/inet.h are not defined by the C standard.
#include <stdlib.h>

#define LISTENQ 100
#define SERV_PORT 9292

void err(char* str)
{
fprintf(stdout, str);
fflush(stdout);
exit(EXIT_FAILU RE);
}

void sendString(char * str)
{
fprintf(stdout, str);
fflush(stdout);
}

int main(int argc,char** argv)
{
int listenfd,connfd ;
socklen_t clilen;
struct sockaddr_in cliaddr,servadd r;
char msg[1024];
int nread;

if((listenfd=so cket(AF_INET,SO CK_STREAM,0))<0 )
There is no socket() function in the C standard.
err("Socket failed");

memset(&servadd r,0,sizeof(serv addr));
servaddr.sin_fa mily=AF_INET;
servaddr.sin_ad dr.s_addr=htonl (INADDR_ANY);
servaddr.sin_po rt=htons(SERV_P ORT);
htonl and htons do not exist in the C standard.

if(bind(listenf d,(struct sockaddr*)&serv addr,sizeof(ser vaddr))<0)
err("Bind failed");
bind() does not exist in the C standard.

if(listen(liste nfd,LISTENQ)<0)
err("Listen failed");
listen() does not exist in the C standard.

for(;;)
{
clilen=sizeof(c liaddr);
connfd=accept(l istenfd,(struct sockaddr*)&clia ddr,&clilen);
accept() does not exist in the C standard.
sendString("New Client");
memset(msg,0,10 24);

while(1)
{
sendString("Per son (server) waiting : \n");
nread=read(conn fd,msg,sizeof(m sg));
read() does not exist in the C standard. The closest is fread()
which takes a FILE* as its first parameter, not an int.
msg[nread]=0;
fprintf(stdout, "Message %s",msg);
fflush(stdout);
sendString("Per son (server) Type the mess to be sent :");
fgets(msg,1024, stdin);
write(connfd,ms g,strlen(msg));
write() does not exist in the C standard. The closest is fwrite(),
which expects a FILE* as its final parameter.

}
close(connfd);
close() does not exist in the C standard. The closest is fclose()
which expects a FILE* as its parameter.
}

}

--
"No one has the right to destroy another person's belief by
demanding empirical evidence." -- Ann Landers

[Christopher Benson-Manica]

chellappa <N.*********@gm ail.com> wrote:

i did a small Chat program in Linux C Socket Programm ... I am using

(Take it to comp.unix.progr ammer.)

Your post is off-topic for comp.lang.c. Please visit

http://www.ungerhu.com/jxh/clc.welcome.txt
http://www.eskimo.com/~scs/C-faq/top.html
http://benpfaff.org/writings/clc/off-topic.html

for posting guidelines and frequently asked questions. Thank you.

--
Christopher Benson-Manica | I *should* know what I'm talking about - if I
ataru(at)cybers pace.org | don't, I need to know. Flames welcome.