client.c

#define _BSD_SOURCE

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>

char message[] = "Kawabounga";

void exitOnError(const char * message)
{
    fprintf(stderr,"%s \n", message);
    exit(EXIT_FAILURE);
}

int main()
{
    int sock;
    struct sockaddr_in sockstr;
    struct in_addr adresse;

    sock = socket(AF_INET, SOCK_STREAM, 0);
    if(sock < 0)
        exitOnError("Socket() client : Nok \n");
    else
        fprintf(stdout, "Socket() client : ok \n");

    sockstr.sin_family = AF_INET;
    sockstr.sin_port = htons(5990);

//	if(inet_aton("127.0.0.1", &adresse) == 0)
//        exitOnError("inet_aton() client : Nok \n");
//    else
//        fprintf(stdout, "inet_aton() client : ok \n");
    //sockstr.sin_addr = adresse;
	sockstr.sin_addr.s_addr = inet_addr("127.0.0.1");
	/* inet_addr is deprecated, please use inet_aton */

    if(connect(sock, (struct sockaddr *) &sockstr, sizeof(sockstr)) == -1)
        exitOnError("connect() client : Nok \n");
    else
        fprintf(stdout, "connect() client : ok \n");

    if (write(sock , message, strlen(message)) < 0)
        exitOnError("write() client : Nok \n");
    else
        fprintf(stdout, "write() client : ok \n");

    close(sock);
    exit(EXIT_SUCCESS);
}