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#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
int main()
{
int mysocket;
mysocket = socket( AF_INET , SOCK_STREAM , IPPROTO_TCP );
if ( mysocket >= 0)
{
unsigned long hote_l;
hote_l = inet_addr( "172.17.0.140" );
struct sockaddr_in adresse;
memset ( &adresse , 0 , sizeof( adresse ) );
adresse.sin_family = AF_INET;
adresse.sin_addr.s_addr = hote_l;
adresse.sin_port = htons( 40001 );
// rendre l'appel connect non bloquant pour changer le temps d'attente de la connexion
int flags;
int r;
flags = fcntl (mysocket, F_GETFL);
r = fcntl (mysocket, F_SETFL, flags | O_NONBLOCK);
int ret_connect = connect( mysocket , (struct sockaddr *) &adresse , sizeof (adresse ) );
if ( ret_connect != 0) // echec , attendre que ca se soit bien connecté
{
if ( errno == EINPROGRESS )
{
struct timeval timeout_connect;
timeout_connect.tv_sec = 2;
timeout_connect.tv_usec = 0;
fd_set fd_connect_read;
fd_set fd_connect_write;
fd_set fd_connect_err;
FD_ZERO(&fd_connect_read);
FD_SET(mysocket, &fd_connect_read);
FD_ZERO(&fd_connect_write);
FD_SET(mysocket, &fd_connect_write);
FD_ZERO(&fd_connect_err);
FD_SET(mysocket, &fd_connect_err );
int rcode = select((int) mysocket+1, /*&fd_connect_read*/ NULL, &fd_connect_write, /*&fd_connect_err*/ NULL , &timeout_connect);
if ( rcode > 0 )
{
if ( FD_ISSET( mysocket , &fd_connect_write ))
{
// ok
printf(" ne devrait pas être là\n");
}
}
else if ( rcode == 0 ) // timeout , pas de connexion
{
printf("le serveur n'est pas là\n");
}
else
{
printf("select a échoué\n");
}
}
else
{
printf("connect a échoué\n");
}
}
r = fcntl (mysocket, F_SETFL, flags & ~O_NONBLOCK);
close( mysocket);
}
return 0;
} |
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