client.c

#include <unistd.h>
#include <netinet/in.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>

#define _exit_on_error() { fprintf(stderr,"error exit on line %d\n",__LINE__); exit(-1); }

int main(int argc, char *argv[])
{
	int sock;
	struct sockaddr_in adresse;
	char hostname[100]="mars01";

	gethostname(hostname,100);
	
	if( (sock = socket(AF_INET,SOCK_STREAM,0) ) == -1)
		_exit_on_error();
	
	adresse.sin_family = AF_INET;
	adresse.sin_port = htons(6969);
	adresse.sin_addr.s_addr=inet_addr("10.107.45.51");
	
	if(connect(sock, (struct sockaddr *) & adresse, sizeof(struct sockaddr_in)))
		_exit_on_error();
	
	if(write(sock,hostname,strlen(hostname)+1)==-1)
		_exit_on_error();
		
	if(close(sock)==-1)
		_exit_on_error();
}