diff --git a/lib/process.c b/lib/process.c
index e840954..cc81fc1 100644
--- a/lib/process.c
+++ b/lib/process.c
@@ -39,5 +39,6 @@ void srv_process_free (struct process * p)
 
 void srv_process_print (struct process *p)
 {
-    printf ("process %d : index %d\n", p->pid, p->index);
+    if (p != NULL)
+        printf ("process %d : index %d\n", p->pid, p->index);
 }
diff --git a/lib/pubsubd.c b/lib/pubsubd.c
index 6e5dfe9..6021ed6 100644
--- a/lib/pubsubd.c
+++ b/lib/pubsubd.c
@@ -5,14 +5,16 @@
 
 void pubsubd_channels_init (struct channels *chans) { LIST_INIT(chans); }
 
-void
+struct channel *
 pubsubd_channels_add (struct channels *chans, struct channel *c)
 {
     if(!chans || !c)
-        return;
+        return NULL;
 
     struct channel *n = pubsubd_channel_copy (c);
     LIST_INSERT_HEAD(chans, n, entries);
+
+    return n;
 }
 
 void
@@ -20,8 +22,8 @@ pubsubd_channels_del (struct channels *chans, struct channel *c)
 {
     struct channel *todel = pubsubd_channel_get (chans, c);
     if(todel != NULL) {
-        LIST_REMOVE(todel, entries);
         pubsubd_channel_free (todel);
+        LIST_REMOVE(todel, entries);
         free (todel);
         todel = NULL;
     }
@@ -45,14 +47,38 @@ void pubsubd_channels_del_all (struct channels *chans)
 
 struct channel * pubsubd_channel_copy (struct channel *c)
 {
+    if (c == NULL)
+        return NULL;
+
     struct channel *copy;
     copy = malloc (sizeof(struct channel));
+    bzero (copy, sizeof (struct channel));
+
     memcpy (copy, c, sizeof(struct channel));
+
+    if (c->chan != NULL) {
+        copy->chan = strndup (c->chan, c->chanlen);
+        copy->chanlen = c->chanlen;
+    }
+
     return copy;
 }
 
 void pubsubd_channel_free (struct channel * c)
 {
+    // TODO
+    if (c == NULL)
+        return;
+
+    if (c->chan != NULL) {
+        free (c->chan);
+        c->chan = NULL;
+    }
+
+    if (c->alh != NULL) {
+        pubsubd_subscriber_del_all (c->alh);
+        free (c->alh);
+    }
 }
 
 struct channel * pubsubd_channel_get (struct channels *chans, struct channel *c)
@@ -73,15 +99,42 @@ pubsubd_channel_eq (const struct channel *c1, const struct channel *c2)
 
 // SUBSCRIBER
 
-void pubsubd_subscriber_init (struct app_list_head *chans) { LIST_INIT(chans); } 
+void pubsubd_subscriber_init (struct app_list_head **chans) {
+    if (chans == NULL)
+        return;
 
-void pubsubd_app_list_elm_print (const struct app_list_elm *ale)
+    if (*chans == NULL)
+        *chans = malloc (sizeof(struct channels));
+    LIST_INIT(*chans);
+} 
+
+void pubsubd_channels_print (const struct channels *chans)
 {
-    printf ( "app_list_elm\n\t");
-    srv_process_print (ale->p);
+    printf ("\033[36mmchannels\033[00m\n\n");
 
-    printf ( "\tchan : %s\n", ale->chan);
-    printf ( "\taction : %d\n", (int) ale->action);
+    if (chans == NULL)
+        return ;
+
+    struct channel *chan = NULL;
+    LIST_FOREACH(chan, chans, entries) {
+        pubsubd_channel_print (chan);
+    }
+}
+
+void pubsubd_channel_print (const struct channel *c)
+{
+    if (c == NULL || c->chan == NULL)
+        return;
+
+    printf ( "\033[32mchan %s\033[00m\n\t", c->chan);
+
+    if (c->alh == NULL)
+        return;
+
+    struct app_list_elm *ale = NULL;
+    LIST_FOREACH(ale, c->alh, entries) {
+        srv_process_print (ale->p);
+    }
 }
 
 struct app_list_elm * pubsubd_app_list_elm_copy (const struct app_list_elm *ale)
@@ -92,7 +145,8 @@ struct app_list_elm * pubsubd_app_list_elm_copy (const struct app_list_elm *ale)
     struct app_list_elm * n;
     n = malloc (sizeof (struct app_list_elm));
 
-    n->p = srv_process_copy(ale->p);
+    if (ale->p != NULL)
+        n->p = srv_process_copy (ale->p);
 
     return n;
 }
@@ -131,13 +185,30 @@ pubsubd_subscriber_del (struct app_list_head *chans, struct app_list_elm *p)
 {
     struct app_list_elm *todel = pubsubd_subscriber_get (chans, p);
     if(todel != NULL) {
-        LIST_REMOVE(todel, entries);
         pubsubd_app_list_elm_free (todel);
+        LIST_REMOVE(todel, entries);
         free (todel);
         todel = NULL;
     }
 }
 
+void pubsubd_subscriber_del_all (struct app_list_head *alh)
+{
+    if (!alh)
+        return;
+
+    struct app_list_elm *ale;
+
+    while (!LIST_EMPTY(alh)) {
+        ale = LIST_FIRST(alh);
+        LIST_REMOVE(ale, entries);
+        pubsubd_app_list_elm_free (ale);
+        free (ale);
+        ale = NULL;
+    }
+}
+
+
 void pubsubd_app_list_elm_create (struct app_list_elm *ale, struct process *p)
 {
     if (ale == NULL)
@@ -148,7 +219,7 @@ void pubsubd_app_list_elm_create (struct app_list_elm *ale, struct process *p)
 
 void pubsubd_app_list_elm_free (struct app_list_elm *todel)
 {
-    if (todel == NULL)
+    if (todel == NULL || todel->p == NULL)
         return;
     srv_process_free (todel->p);
 }
@@ -202,12 +273,16 @@ void pubsubd_msg_free (struct pubsub_msg *msg)
 
 // COMMUNICATION
 
-int pubsubd_get_new_process (struct service *srv, struct app_list_elm *ale)
+int pubsubd_get_new_process (struct service *srv, struct app_list_elm *ale
+        , struct channels *chans)
 {
+    if (srv == NULL || ale == NULL || chans == NULL)
+        return -1;
+
     if (ale->p != NULL) {
         free (ale->p);
+        ale->p = NULL;
     }
-
     ale->p = malloc (sizeof (struct process));
 
     char *buf;
@@ -217,7 +292,7 @@ int pubsubd_get_new_process (struct service *srv, struct app_list_elm *ale)
     // parse pubsubd init msg (sent in TMPDIR/<service>)
     //
     // line fmt : pid index version chan action
-    // action : pub | sub
+    // action : quit | pub | sub
 
     size_t i;
     char *str, *token, *saveptr;
@@ -226,6 +301,9 @@ int pubsubd_get_new_process (struct service *srv, struct app_list_elm *ale)
     int index;
     int version;
 
+    char chan[BUFSIZ];
+    bzero (chan, BUFSIZ);
+
     for (str = buf, i = 1; ; str = NULL, i++) {
         token = strtok_r(str, " ", &saveptr);
         if (token == NULL)
@@ -235,26 +313,53 @@ int pubsubd_get_new_process (struct service *srv, struct app_list_elm *ale)
             case 1 : pid = strtoul(token, NULL, 10); break;
             case 2 : index = strtoul(token, NULL, 10); break;
             case 3 : version = strtoul(token, NULL, 10); break;
-            case 4 : memcpy (ale->chan, token, strlen (token)); break;
+            case 4 : {
+                         memcpy (chan, token, (strlen (token) < BUFSIZ) ?
+                                 strlen (token) : BUFSIZ);
+                         break;
+                     }
             case 5 : {
-                         if (strncmp("pub", token, 3) == 0) {
-                             ale->action = 0;
+                         if (strncmp("both", token, 4) == 0) {
+                             ale->action = PUBSUB_BOTH;
                          }
+                         else if (strncmp("pub", token, 3) == 0) {
+                             ale->action = PUBSUB_PUB;
+                         } 
                          else if (strncmp("sub", token, 3) == 0) {
-                             ale->action = 1;
-                         }
-                         else if (strncmp("both", token, 4) == 0) {
-                             ale->action = 2;
+                             ale->action = PUBSUB_SUB;
                          }
                          else { // everything else is about killing the service
-                             ale->action = 3;
+                             ale->action = PUBSUB_QUIT;
                          }
                      }
         }
     }
 
+    if (buf != NULL) {
+        free (buf);
+        buf = NULL;
+    }
+
+    chan[BUFSIZ -1] = '\0';
+
+    struct channel c;
+    bzero (&c, sizeof (struct channel));
+    c.chan = strndup (chan, BUFSIZ);
+    c.chanlen = strlen (chan);
+
+    struct channel *new_chan;
+    new_chan = pubsubd_channel_get (chans, &c);
+    if (new_chan == NULL) {
+        new_chan = pubsubd_channels_add (chans, &c);
+        pubsubd_subscriber_init (&new_chan->alh);
+    }
+    pubsubd_channel_free (&c);
+
     srv_process_gen (ale->p, pid, index, version);
-    ale->chanlen = strlen (ale->chan);
+
+    // add the subscriber
+    if (ale->action == PUBSUB_SUB || ale->action == PUBSUB_BOTH)
+        pubsubd_subscriber_add (new_chan->alh, ale);
 
     return 0;
 }
@@ -293,6 +398,10 @@ int pubsubd_msg_read_cb (FILE *f, char ** buf, size_t * msize)
     memcpy (&cbuf[i], chan, chanlen);                i += chanlen;
     memcpy (&cbuf[i], &datalen, sizeof(size_t));     i += sizeof(size_t);
     memcpy (&cbuf[i], data, datalen);                i += datalen;
+
+    free (chan);
+    free (data);
+
     return 0;
 }
 
diff --git a/lib/pubsubd.h b/lib/pubsubd.h
index ca62714..8c1e015 100644
--- a/lib/pubsubd.h
+++ b/lib/pubsubd.h
@@ -26,7 +26,8 @@ void pubsubd_msg_serialize (const struct pubsub_msg *msg, char **data, size_t *l
 void pubsubd_msg_unserialize (struct pubsub_msg *msg, const char *data, size_t len);
 void pubsubd_msg_free (struct pubsub_msg *msg);
 
-int pubsubd_get_new_process (struct service *srv, struct app_list_elm *ale);
+int pubsubd_get_new_process (struct service *srv, struct app_list_elm *ale
+        , struct channels *chans);
 int pubsubd_msg_read_cb (FILE *f, char ** buf, size_t * msize);
 void pubsubd_msg_send (const struct app_list_head *alh, const struct pubsub_msg *m);
 void pubsubd_msg_recv (struct process *p, struct pubsub_msg *m);
@@ -40,47 +41,55 @@ void pubsub_msg_recv (const struct service *, struct pubsub_msg *msg);
 LIST_HEAD(channels, channel);
 
 // element of the list
+// channel : chan name + chan name length + a list of applications
 struct channel {
     char *chan;
     size_t chanlen;
+    struct app_list_head *alh;
     LIST_ENTRY(channel) entries;
 };
 
-void pubsubd_channels_init (struct channels *chans);
+//  simple channel
 struct channel * pubsubd_channel_copy (struct channel *c);
 struct channel * pubsubd_channel_get (struct channels *chans, struct channel *c);
-void pubsubd_channels_del (struct channels *chans, struct channel *c);
-void pubsubd_channels_del_all (struct channels *chans);
-
 void pubsubd_channel_free (struct channel *c);
 int pubsubd_channel_eq (const struct channel *c1, const struct channel *c2);
+void pubsubd_channel_print (const struct channel *c);
+
+// list of channels
+void pubsubd_channels_init (struct channels *chans);
+void pubsubd_channels_print (const struct channels *chans);
+struct channel * pubsubd_channels_add (struct channels *chans, struct channel *c);
+void pubsubd_channels_del (struct channels *chans, struct channel *c);
+void pubsubd_channels_del_all (struct channels *chans);
 
 // APPLICATION
 
 // head of the list
 LIST_HEAD(app_list_head, app_list_elm);
 
+enum app_list_elm_action { PUBSUB_QUIT, PUBSUB_PUB, PUBSUB_SUB, PUBSUB_BOTH };
+
 // element of the list
 struct app_list_elm {
     struct process *p;
-    char chan[BUFSIZ];
-    size_t chanlen;
-    char action; // 0 : pub, 1 : sub, 2 : both, kill the service : 3
+    enum app_list_elm_action action;
     LIST_ENTRY(app_list_elm) entries;
 };
 
 int
 pubsubd_subscriber_eq (const struct app_list_elm *, const struct app_list_elm *);
 
+void pubsubd_subscriber_init (struct app_list_head **chans);
 void pubsubd_subscriber_add (struct app_list_head *
         , const struct app_list_elm *);
 struct app_list_elm * pubsubd_subscriber_get (const struct app_list_head *
         , const struct app_list_elm *);
 void pubsubd_subscriber_del (struct app_list_head *al, struct app_list_elm *p);
+void pubsubd_subscriber_del_all (struct app_list_head *alh);
 
 struct app_list_elm * pubsubd_app_list_elm_copy (const struct app_list_elm *ale);
 void pubsubd_app_list_elm_create (struct app_list_elm *ale, struct process *p);
 void pubsubd_app_list_elm_free (struct app_list_elm *todel);
-void pubsubd_app_list_elm_print (const struct app_list_elm *ale);
 
 #endif
diff --git a/pubsub/pubsubd.c b/pubsub/pubsubd.c
index 0b235da..86f44d1 100644
--- a/pubsub/pubsubd.c
+++ b/pubsub/pubsubd.c
@@ -11,6 +11,7 @@ ohshit(int rvalue, const char* str) {
 main(int argc, char* argv[])
 {
     struct service srv;
+    bzero (&srv, sizeof (struct service));
     srv_init (&srv, PUBSUB_SERVICE_NAME);
     printf ("Listening on %s.\n", srv.spath);
 
@@ -20,29 +21,45 @@ main(int argc, char* argv[])
 
     // init chans list
     struct channels chans;
+    bzero (&chans, sizeof (struct channels));
     pubsubd_channels_init (&chans);
 
     for (;;) {
         // for each new process
         struct app_list_elm ale;
-        pubsubd_get_new_process (&srv, &ale);
-        pubsubd_app_list_elm_print (&ale);
+        bzero (&ale, sizeof (struct app_list_elm));
 
-        // stop the application ? (action 3)
-        if (ale.action == 3) {
-            pubsubd_channels_del_all (&chans);
+        pubsubd_get_new_process (&srv, &ale, &chans);
+        pubsubd_channels_print (&chans);
+
+        // end the application
+        if (ale.action == PUBSUB_QUIT) {
             printf ("Quitting ...\n");
+
+            pubsubd_channels_del_all (&chans);
+            srv_close (&srv);
+            
+            // TODO end the threads
+
             exit (0);
         }
 
-        // add the chan to the list
+        // TODO thread to handle multiple clients at a time
 
+        // TODO register the subscriber
         // each chan has a list of subscribers
         // someone who only push a msg doesn't need to be registered
+        if (ale.action == PUBSUB_SUB || ale.action == PUBSUB_BOTH) {
+            // TODO
+        }
+        else if (ale.action == PUBSUB_PUB) {
+            // TODO add it to the application to follow
+            // TODO publish a message
 
-        // 
+            // then 
+        }
 
-        // TODO thread to handle multiple clients at a time
+        pubsubd_app_list_elm_free (&ale);
     }
 
     // the application will shut down, and remove the service named pipe