echo TCP_client

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <arpa/inet.h>

#include <sys/types.h>

#include <sys/socket.h>

#define BUFSIZE 1024

void error_handling(char *message);

int main(int argc, char **argv)

{

int sock;

char message[BUFSIZE];

int str_len;

struct sockaddr_in serv_addr;

if(argc!=3){

printf("Usage : %s <IP> <prot>\n",argv[0]);

exit(1);

}

sock=socket(PF_INET,SOCK_STREAM,0);

if(sock==-1)

error_handling("socket()error");

memset(&serv_addr,0,sizeof(serv_addr));

serv_addr.sin_family=AF_INET;

serv_addr.sin_addr.s_addr=inet_addr(argv[1]);

serv_addr.sin_port=htons(atoi(argv[2]));

if(connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr))==-1)

error_handling("connect() error!");

while(1){

/*Enter and Send message*/

fputs("Enter Message (q to quit) : ",stdout);

fgets(message, BUFSIZE, stdin);

if(!strcmp(message,"q\n"))

break;

write(sock, message, strlen(message));

/*get message and print*/

str_len=read(sock, message,BUFSIZE-1);

message[str_len]=0;

printf("message : %s \n",message);

}

close(sock);

return 0;

}

void error_handling(char *message)

{

fputs(message,stderr);

fputc('\n',stderr);

exit(1);

}