Modified Files:

 	header.c io.c mailbox.c mailbox.h mailbox0.h mbx_unix.c
 	message.c message.h message0.h
 Added Files:
 	event.h

added registrations of certain events.

+/* GNU mailutils - a suite of utilities for electronic mail
+   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Library Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifndef _EVENT_H
+#define _EVENT_H
+
+#ifndef __P
+# ifdef __STDC__
+#  define __P(args) args
+# else
+#  define __P(args) ()
+# endif
+#endif /* __P */
+
+#ifdef _cpluscplus
+extern "C" {
+#endif
+
+struct _event
+{
+  size_t type;
+  void *arg;
+  int (*_action) __P ((size_t type, void *arg));
+};
+typedef struct _event *event_t;
+
+#ifdef _cpluscplus
+}
+#endif
+
+#endif /* _EVENT_H */

@@ -26,9 +26,11 @@
 #include <stdlib.h>
 #include <errno.h>
 
-static int header_parse (header_t *h, const char *blurb, size_t len);
+static int header_parse (header_t h, const char *blurb, size_t len);
 static int header_read (istream_t is, char *buf, size_t buflen,
 			off_t off, ssize_t *pnread);
+static int header_write (ostream_t os, const char *buf, size_t buflen,
+			 off_t off, ssize_t *pnwrite);
 
 struct _hdr
 {
@@ -67,9 +69,18 @@ header_init (header_t *ph, const char *blurb, size_t len, void *owner)
     return ENOMEM;
   h->owner = owner;
 
-  status = header_parse (&h, blurb, len);
+  status = header_parse (h, blurb, len);
   if (status != 0)
     free (h);
+
+  status = istream_init (&(h->is), header_read, h);
+  if (status != 0)
+    return status;
+
+  status = ostream_init (&(h->os), header_write, h);
+  if (status != 0)
+    return status;
+
   *ph = h;
   return status;
 }
@@ -109,21 +120,16 @@ header_destroy (header_t *ph, void *owner)
  * on how to handle the case.
  */
 static int
-header_parse (header_t *h, const char *blurb, size_t len)
+header_parse (header_t header, const char *blurb, size_t len)
 {
-  header_t header;
   char *header_end;
   char *header_start;
   char *header_start2;
   struct _hdr *hdr;
 
-  if (h == NULL || blurb == NULL || len == 0)
+  if (header == NULL || blurb == NULL || len == 0)
     return EINVAL;
 
-  header = calloc (1, sizeof (*header));
-  if (header == NULL)
-    return ENOMEM;
-
   header->blurb = calloc (1, len);
   if (header->blurb == NULL)
     {
@@ -200,7 +206,6 @@ header_parse (header_t *h, const char *blurb, size_t len)
 	  header->hdr[header->hdr_count - 1].fv_end = header_end;
 	}
     }
-  *h = header;
   return 0;
 }
 
@@ -336,6 +341,24 @@ header_entry_value (header_t header, size_t num, char *buf,
 }
 
 static int
+header_write (ostream_t os, const char *buf, size_t buflen,
+	      off_t off, ssize_t *pnwrite)
+{
+  header_t header;
+  if (os == NULL || (header = (header_t)os->owner) == NULL)
+    return EINVAL;
+
+  (void)buf; (void)off;
+  if (buflen == 0)
+    return 0;
+
+  if (pnwrite)
+    *pnwrite = 0;
+
+  return ENOSYS;
+}
+
+static int
 header_read (istream_t is, char *buf, size_t buflen,
 	     off_t off, ssize_t *pnread)
 {
@@ -365,16 +388,8 @@ header_read (istream_t is, char *buf, size_t buflen,
 int
 header_get_istream (header_t header, istream_t *pis)
 {
-  int err;
   if (header == NULL || pis == NULL)
     return EINVAL;
-  /* already done */
-  if  (header->is)
-    *pis = header->is;
-
-  err = istream_init (&(header->is), header_read, header->owner);
-  if (err != 0)
-    return err;
   *pis = header->is;
   return 0;
 }
@@ -384,5 +399,6 @@ rfc822_get_ostream (header_t header, ostream_t *pos)
 {
   if (header == NULL || pos == NULL)
     return EINVAL;
+  *pos = header->os;
   return ENOSYS;
 }

@@ -64,7 +64,7 @@ istream_destroy (istream_t *pis, void *owner)
       is->ref_count--;
       if ((is->owner && is->owner == owner) ||
 	  (is->owner == NULL && is->ref_count <= 0))
-	free (pis);
+	free (is);
       *pis = NULL;
     }
 }
@@ -78,7 +78,7 @@ ostream_destroy (ostream_t *pos, void *owner)
       os->ref_count--;
       if ((os->owner && os->owner == owner) ||
 	  (os->owner == NULL && os->ref_count <= 0))
-	free (*pos);
+	free (os);
       *pos = NULL;
     }
 }

@@ -157,19 +157,6 @@ mailbox_num_deleted (mailbox_t mbox, size_t *num)
   return mbox->_num_deleted (mbox, num);
 }
 
-/* hook to allow some sort of "progress bar" .. I don't like it
- * but can not find any other way yet
- */
-int
-mailbox_progress (mailbox_t mbox, int (*progress) (int, void *arg), void *arg)
-{
-  if (mbox == NULL)
-    return EINVAL;
-  mbox->_progress = progress;
-  mbox->progress_arg = arg;
-  return 0;
-}
-
 int
 mailbox_is_updated (mailbox_t mbox)
 {
@@ -217,3 +204,73 @@ mailbox_get_auth (mailbox_t mbox, auth_t *pauth)
   return 0;
 }
 
+int
+mailbox_register (mailbox_t mbox, size_t type,
+		  int (*action) (size_t type, void *arg),
+		  void *arg)
+{
+  size_t i;
+  event_t event;
+
+  /* FIXME: I should check for invalid types */
+  if (mbox == NULL || action == NULL)
+    return EINVAL;
+
+  /* find a free spot */
+  for (i = 0; i < mbox->event_num; i++)
+    {
+      event = &(mbox->event[i]);
+      if (event->_action == NULL)
+	{
+	  event->_action = action;
+	  event->type = type;
+	  event->arg = arg;
+	  return 0;
+	}
+    }
+
+  /* a new one */
+  event = realloc (mbox->event, (mbox->event_num + 1) * sizeof (*event));
+  if (event == NULL)
+    return ENOMEM;
+
+  mbox->event = event;
+  event[mbox->event_num]._action = action;
+  event[mbox->event_num].type = type;
+  event[mbox->event_num].arg = arg;
+  mbox->event_num++;
+  return 0;
+}
+
+int
+mailbox_deregister (mailbox_t mbox, void *action)
+{
+  size_t i;
+  event_t event;
+
+  for (i = 0; i < mbox->event_num; i++)
+    {
+      event = &(mbox->event[i]);
+      if (event->_action == action)
+	{
+	  event->type = 0;
+	  event->_action = NULL;
+	  event->arg = NULL;
+	  return 0;
+	}
+    }
+  return ENOENT;
+}
+
+void
+mailbox_notification (mailbox_t mbox, size_t type)
+{
+  size_t i;
+  event_t event;
+  for (i = 0; i < mbox->event_num; i++)
+    {
+      event = &(mbox->event[i]);
+      if ((event->_action) &&  (event->type & type))
+	event->_action (type, event->arg);
+    }
+}

@@ -81,6 +81,17 @@ extern int mailbox_size          __P ((mailbox_t, off_t size));
 
 extern int mailbox_get_url       __P ((mailbox_t, url_t *));
 
+/* events */
+#define MU_EVT_MBX_DESTROY      1
+#define MU_EVT_MBX_CORRUPTED    2
+#define MU_EVT_MBX_MSG_ADD      4
+#define MU_EVT_MBX_PROGRESS     8
+
+extern int mailbox_register __P ((mailbox_t mbox, size_t type,
+				  int (*action) (size_t type, void *arg),
+				  void *arg));
+extern int mailbox_deregister __P ((mailbox_t mbox, void *action));
+
 #ifdef __cplusplus
 }
 #endif

@@ -19,6 +19,7 @@
 #define _MAILBOX0_H
 
 #include <mailbox.h>
+#include <event.h>
 
 #include <sys/types.h>
 #include <stdio.h>
@@ -42,8 +43,10 @@ struct _mailbox
   auth_t auth;
   locker_t locker;
   url_t url;
-  int  (*_progress)  __P ((int, void *arg));
-  void *progress_arg;
+
+  /* register events */
+  event_t event;
+  size_t event_num;
 
   /* Back pointer to the specific mailbox */
   void *data;
@@ -87,9 +90,7 @@ extern int mailbox_get_attribute  __P ((mailbox_t mbox, size_t msgno,
 					attribute_t *attr));
 extern int mailbox_set_attribute  __P ((mailbox_t mbox, size_t msgno,
 					attribute_t attr));
-extern int mailbox_progress       __P ((mailbox_t mbox,
-					int (*progress) (int, void *arg),
-					void *arg));
+extern void mailbox_notification   __P ((mailbox_t mbox, size_t type));
 
 
 #ifdef __cplusplus

@@ -21,8 +21,8 @@
 #include <registrar0.h>
 #include <message0.h>
 #include <url0.h>
-#include <attribute.h>
 #include <io0.h>
+#include <attribute.h>
 #include <header.h>
 #include <auth.h>
 #include <locker.h>
@@ -105,6 +105,8 @@ typedef struct _mailbox_unix_data
 #endif
   time_t mtime;
   off_t size;
+
+  int busy;
 } *mailbox_unix_data_t;
 
 static int mailbox_unix_open (mailbox_t mbox, int flag);
@@ -129,6 +131,7 @@ static ssize_t mailbox_unix_get_header (mailbox_t, size_t msgno, char *h,
 
 
 /* private stuff */
+static int mailbox_unix_validity (mailbox_t mbox, size_t msgno);
 static int mailbox_unix_readstream (istream_t is, char *buffer, size_t buflen,
 				    off_t off, ssize_t *pnread);
 static int mailbox_unix_is_from (const char *);
@@ -312,6 +315,8 @@ mailbox_unix_destroy (mailbox_t *pmbox)
 	  free (mbox->data);
 	}
       free (mbox->name);
+      /* free the event array */
+      free (mbox->event);
       /* destroy the url */
       if (mbox->url)
 	url_destroy (&(mbox->url));
@@ -623,6 +628,10 @@ mailbox_unix_parse (mailbox_t mbox, size_t *msgs)
       (mud = (mailbox_unix_data_t)mbox->data) == NULL)
     return EINVAL;
 
+  if (mud->busy == 1)
+    return 0;
+  mud->busy = 1;
+
   /* FIXME:  I should also block signals and check cancelstate(Pthread)
      since We can not afford to be intr */
   mailbox_unix_ilock (mbox, MU_LOCKER_WRLOCK);
@@ -635,6 +644,7 @@ mailbox_unix_parse (mailbox_t mbox, size_t *msgs)
       funlockfile (mud->file);
       mailbox_unix_iunlock (mbox);
       mailbox_unix_unlock (mbox);
+      mud->busy = 0;
       return status;
     }
   mud->mtime = st.st_mtime;
@@ -653,6 +663,18 @@ mailbox_unix_parse (mailbox_t mbox, size_t *msgs)
               mum[count - 1].body_end = ftell (mud->file);
               mum[count - 1].body_end -= (over + 1);
 	      body = 0;
+	      /* notifications */
+	      {
+		off_t where = ftell (mud->file);
+		funlockfile (mud->file);
+		mailbox_unix_iunlock (mbox);
+		mailbox_unix_unlock (mbox);
+		mailbox_notification (mbox, MU_EVT_MBX_MSG_ADD);
+		flockfile (mud->file);
+		mailbox_unix_ilock (mbox, MU_LOCKER_WRLOCK);
+		mailbox_unix_lock (mbox, MU_LOCKER_RDLOCK);
+		fseek (mud->file, where, SEEK_SET);
+	      }
 	    }
 	  header = 1;
 	}
@@ -665,21 +687,6 @@ mailbox_unix_parse (mailbox_t mbox, size_t *msgs)
 	  int over = strlen (buf);
 
 	  count++;
-	  /* FIXME: This is a bad idea, we should not be allowed to
-	   * jump out from the parsing this way.  We sit at the mercy
-	   * of this function(_progress) waiting for disaster.
-	   */
-	  if (mbox->_progress)
-	    {
-	      /* FIXME: and its getting better, they can even bailout */
-	      if (mbox->_progress (count, mbox->progress_arg) != 0)
-		{
-		  funlockfile (mud->file);
-		  mailbox_unix_iunlock (mbox);
-		  mailbox_unix_unlock (mbox);
-		  return EINTR;
-		}
-	    }
 	  /* allocate space for the new message */
 	  if (count > mud->messages_count)
 	    {
@@ -689,6 +696,7 @@ mailbox_unix_parse (mailbox_t mbox, size_t *msgs)
 		  funlockfile (mud->file);
 		  mailbox_unix_iunlock (mbox);
 		  mailbox_unix_unlock (mbox);
+		  mud->busy = 0;
 		  return ENOMEM;
 		}
 	      mud->messages_count++;
@@ -712,6 +720,7 @@ mailbox_unix_parse (mailbox_t mbox, size_t *msgs)
 	      funlockfile (mud->file);
 	      mailbox_unix_iunlock (mbox);
 	      mailbox_unix_unlock (mbox);
+	      mud->busy = 0;
 	      return status;
 	    }
 	  mum[count - 1].header_end = ftell (mud->file) - strlen(buf);
@@ -733,8 +742,32 @@ mailbox_unix_parse (mailbox_t mbox, size_t *msgs)
 	      fseek (mud->file, content_length, SEEK_CUR);
 	      content_length = -1;
 	      body = 0;
+	      /* notification release all locks*/
+	      {
+		off_t where = ftell (mud->file);
+		funlockfile (mud->file);
+		mailbox_unix_iunlock (mbox);
+		mailbox_unix_unlock (mbox);
+		mailbox_notification (mbox, MU_EVT_MBX_MSG_ADD);
+		flockfile (mud->file);
+		mailbox_unix_ilock (mbox, MU_LOCKER_WRLOCK);
+		mailbox_unix_lock (mbox, MU_LOCKER_RDLOCK);
+		fseek (mud->file, where, SEEK_SET);
+	      }
 	    }
 	}
+      /* notifications release all locks */
+      {
+	off_t where = ftell (mud->file);
+	funlockfile (mud->file);
+	mailbox_unix_iunlock (mbox);
+	mailbox_unix_unlock (mbox);
+	mailbox_notification (mbox, MU_EVT_MBX_PROGRESS);
+	flockfile (mud->file);
+	mailbox_unix_ilock (mbox, MU_LOCKER_WRLOCK);
+	mailbox_unix_lock (mbox, MU_LOCKER_RDLOCK);
+	fseek (mud->file, where, SEEK_SET);
+      }
       mailbox_unix_touchlock (mbox);
     } /* while */
   status = errno;
@@ -750,6 +783,8 @@ mailbox_unix_parse (mailbox_t mbox, size_t *msgs)
   mailbox_unix_unlock (mbox);
   if (msgs)
     *msgs = count;
+  mud->busy = 0;
+  mailbox_notification (mbox, MU_EVT_MBX_MSG_ADD);
   return status;
 }
 
@@ -771,25 +806,26 @@ mailbox_unix_is_updated (mailbox_t mbox)
 }
 
 static int
-mailbox_unix_is_valid (mailbox_t mbox, size_t msgno)
+mailbox_unix_validity (mailbox_t mbox, size_t msgno)
 {
   mailbox_unix_data_t mud;
   if (mbox == NULL ||
       (mud = (mailbox_unix_data_t) mbox->data) == NULL)
-    return 0;
+    return EINVAL;
   /* valid ? */
-  return (mud->messages_count > 0 && msgno <= mud->messages_count);
+  return !(mud->messages_count > 0 && msgno > 0 &&
+	  msgno <= mud->messages_count);
 }
 
 static int
 mailbox_unix_is_deleted (mailbox_t mbox, size_t msgno)
 {
   mailbox_unix_data_t mud;
-
-  if (mbox == NULL ||
-      (mud = (mailbox_unix_data_t)mbox->data) == NULL ||
-      ! mailbox_unix_is_valid (mbox, msgno))
-    return 0;
+  int status = mailbox_unix_validity (mbox, msgno);
+  if (status != 0)
+    return status;
+  msgno--;
+  mud = (mailbox_unix_data_t) mbox->data;
   return attribute_is_deleted (mud->umessages[msgno].new_attr);
 }
 
@@ -797,18 +833,17 @@ static int
 mailbox_unix_delete (mailbox_t mbox, size_t msgno)
 {
   mailbox_unix_data_t mud;
+  int status = mailbox_unix_validity (mbox, msgno);
+  if (status != 0)
+    return status;
 
-  if (mbox == NULL ||
-      (mud = (mailbox_unix_data_t) mbox->data) == NULL)
-    return EINVAL;
-
-  /* oops out of range ? */
   /* if already deleted, noop */
-  if (! mailbox_unix_is_valid (mbox, msgno) ||
-      mailbox_unix_is_deleted (mbox, msgno))
+  if (mailbox_unix_is_deleted (mbox, msgno))
     return 0;
 
   /* Mark for deletion */
+  msgno--;
+  mud = (mailbox_unix_data_t) mbox->data;
   attribute_set_deleted (mud->umessages[msgno].new_attr);
   return 0;
 }
@@ -838,17 +873,17 @@ static int
 mailbox_unix_undelete (mailbox_t mbox, size_t msgno)
 {
   mailbox_unix_data_t mud;
+  int status = mailbox_unix_validity (mbox, msgno);
+  if (status != 0)
+    return status;
 
-  if (mbox == NULL ||
-      (mud = (mailbox_unix_data_t) mbox->data) == NULL)
-    return EINVAL;
-  /* oops out of range ? */
   /* if already undeleted, noop */
-  if (! mailbox_unix_is_valid (mbox, msgno) ||
-      ! mailbox_unix_is_deleted (mbox, msgno))
+  if (! mailbox_unix_is_deleted (mbox, msgno))
     return 0;
 
   /* Mark undeletion */
+  msgno--;
+  mud = (mailbox_unix_data_t) mbox->data;
   attribute_unset_deleted (mud->umessages[msgno].new_attr);
   return 0;
 }
@@ -894,10 +929,15 @@ mailbox_unix_expunge (mailbox_t mbox)
   if (tmpfile == NULL)
     return errno;
 
+  if (mud->busy == 1)
+    return EINPROGRESS;
+  mud->busy = 1;
+
   /* Get the lock */
   if (mailbox_unix_lock (mbox, MU_LOCKER_WRLOCK) < 0)
     {
       fclose (tmpfile);
+      mud->busy = 0;
       return ENOLCK;
     }
 
@@ -1147,6 +1187,7 @@ bailout:
   mailbox_unix_iunlock (mbox);
   fclose (tmpfile);
   sigprocmask (SIG_UNBLOCK, &sigset, 0);
+  mud->busy = 0;
   return status;
 }
 
@@ -1155,7 +1196,6 @@ mailbox_unix_readstream (istream_t is, char *buffer, size_t buflen,
 			off_t off, ssize_t *pnread)
 {
   mailbox_unix_message_t mum;
-  size_t len;
   size_t nread = 0;
 
   if (is == NULL || (mum = (mailbox_unix_message_t)is->owner) == NULL)
@@ -1173,7 +1213,7 @@ mailbox_unix_readstream (istream_t is, char *buffer, size_t buflen,
     off_t ln = mum->body_end - (mum->body + off);
     if (ln > 0)
       {
-	nread = ((size_t)ln < len) ? ln : len;
+	nread = ((size_t)ln < buflen) ? ln : buflen;
 	/* position the file pointer and the buffer */
 	if (fseek (mum->file, mum->body + off, SEEK_SET) < 0)
 	  {
@@ -1202,14 +1242,13 @@ mailbox_unix_get_header (mailbox_t mbox, size_t msgno, char *buffer,
 {
   mailbox_unix_data_t mud;
   size_t nread = 0;
-
-  if (mbox == NULL ||
-      (mud = (mailbox_unix_data_t)mbox->data) == NULL)
-    return EINVAL;
-
   /* check if valid */
-  if (! mailbox_unix_is_valid (mbox, msgno))
-    return EINVAL;
+  int status = mailbox_unix_validity (mbox, msgno);
+  if (status != 0)
+    return status;
+
+  mud = (mailbox_unix_data_t) mbox->data;
+  msgno--;
 
   if (buffer == NULL || len == 0)
     {
@@ -1271,7 +1310,7 @@ mailbox_unix_get_message (mailbox_t mbox, size_t msgno, message_t *pmsg)
       mailbox_unix_is_deleted (mbox, msgno))
     return EINVAL;
 
-  mum = &(mud->umessages[msgno]);
+  mum = &(mud->umessages[msgno - 1]);
 
   /* check if we already have it */
   if (mum->message)
@@ -1326,14 +1365,12 @@ mailbox_unix_get_message (mailbox_t mbox, size_t msgno, message_t *pmsg)
   message_set_header (msg, header, mum);
 
   /* prepare the istream */
-  status = istream_init (&is, mailbox_unix_readstream, mum);
   if ((status = istream_init (&is, mailbox_unix_readstream, mum)) != 0 ||
       (status = message_set_istream (msg, is, mum)) != 0)
     {
       message_destroy (&msg, mum);
       return status;
     }
-  message_set_istream (msg, is, mum);
 
   /* set the attribute */
   status = message_set_attribute (msg, mum->new_attr, mum);
@@ -1351,6 +1388,9 @@ mailbox_unix_get_message (mailbox_t mbox, size_t msgno, message_t *pmsg)
       return status;
     }
 
+  /* attach the message to the mailbox unix data */
+  mum->message = msg;
+
   if (pmsg)
     *pmsg = msg;
   return 0;

@@ -31,36 +31,59 @@ static int message_read (istream_t is, char *buf, size_t buflen,
 static int message_write (ostream_t os, const char *buf, size_t buflen,
 			  off_t off, ssize_t *pnwrite);
 
-int message_clone (message_t omsg, message_t *pmsg)
+int
+message_clone (message_t msg)
 {
   int status;
   FILE *file;
-  message_t msg;
   istream_t is;
   ostream_t os;
   header_t header;
+  attribute_t attribute;
+  body_t body;
   char buffer[BUFSIZ];
   char *pbuf = NULL;
   char *tbuf = NULL;
   off_t offset = 0;
   size_t nread = 0;
 
+  if (msg == NULL)
+    return EINVAL;
+
+  /* If is not own, then it's a floating message
+   * just bump the reference count.
+   */
+  if (msg->owner == NULL)
+    {
+      if (msg->ref_count <= 0)
+	msg->ref_count = 1;
+      else
+	msg->ref_count++;
+      return 0;
+    }
+
   /* retreive the header */
   {
-    status = message_get_header (omsg, &header);
-    if (status != 0)
-      return status;
+    header = msg->header;
     status = header_get_istream (header, &is);
     if (status != 0)
       return status;
 
     do {
+      /* FIXME: can not afford to be non blocking here
+       * so we busy spin.  VERY VERY BAD
+       */
+      do {
 	status = istream_read (is, buffer, sizeof (buffer), offset, &nread);
+      } while (status == EAGAIN);
+
       if (status != 0)
 	{
 	  free (pbuf);
 	  return status;
 	}
+      if (nread == 0)
+	break;
       tbuf = realloc (pbuf, offset + nread);
       if (tbuf == NULL)
 	{
@@ -73,7 +96,6 @@ int message_clone (message_t omsg, message_t *pmsg)
       offset += nread;
     } while (nread > 0);
 
-
     status = header_init (&header, pbuf, offset, NULL);
     if (status != 0)
       {
@@ -81,11 +103,11 @@ int message_clone (message_t omsg, message_t *pmsg)
 	return status;
       }
     free (pbuf);
-
   }
 
   /* retrieve the body */
   {
+    is = msg->is;
     file = tmpfile ();
     if (file == NULL)
       {
@@ -93,44 +115,66 @@ int message_clone (message_t omsg, message_t *pmsg)
 	return errno;
       }
     offset = 0;
-    message_get_istream (omsg, &is);
     do {
-      istream_read (is, buffer, sizeof (buffer), offset, &nread);
+      do
+	{
+	  status = istream_read (is, buffer, sizeof (buffer), offset, &nread);
+	} while (status == EAGAIN);
+      if (status != 0)
+	{
+	  header_destroy (&header, NULL);
+	  return status;
+	}
       fwrite (buffer, sizeof (*buffer), nread, file);
       offset += nread;
     } while (nread > 0);
     rewind (file);
   }
 
-  /* create the message */
-  status = message_init (&msg, NULL);
-  if (status != 0)
-    return status;
-
-  /* set the header */
-  message_set_header (msg, header, NULL);
-
   /* set the body with the streams */
-  msg->body = calloc (1, sizeof (*(msg->body)));
-  if (msg->body == NULL)
+  body = calloc (1, sizeof (*body));
+  if (body == NULL)
     {
       fclose (file);
-      message_destroy (&msg, NULL);
+      header_destroy (&header, NULL);
       return ENOMEM;
     }
   status = istream_init (&is, message_read, NULL);
   if (status != 0)
     {
-      message_destroy (&msg, NULL);
+      fclose (file);
+      header_destroy (&header, NULL);
       return status;
     }
   status = ostream_init (&os, message_write, NULL);
   if (status != 0)
     {
-      message_destroy (&msg, NULL);
+      fclose (file);
+      header_destroy (&header, NULL);
+      istream_destroy (&is, NULL);
       return status;
     }
-  *pmsg = msg;
+
+  /* attribute */
+  status = attribute_init (&attribute, NULL);
+  if (status != 0)
+    {
+      fclose (file);
+      header_destroy (&header, NULL);
+      istream_destroy (&is, NULL);
+      ostream_destroy (&os, NULL);
+    }
+  attribute_copy (attribute, msg->attribute);
+
+  /* every thing went ok */
+  msg->header = header;
+  msg->attribute =  attribute;
+  msg->is = is;
+  msg->os = os;
+  msg->body = body;
+  msg->size = offset;
+  msg->ref_count = 1;
+  msg->owner = NULL; /* orphan */
   return 0;
 }
 
@@ -160,24 +204,37 @@ message_destroy (message_t *pmsg, void *owner)
       if ((msg->owner && msg->owner == owner) ||
 	  (msg->owner == NULL && msg->ref_count <= 0))
 	{
+	  header_t header = msg->header;
+	  attribute_t attribute = msg->attribute;
+	  istream_t is = msg->is;
+	  ostream_t os = msg->os;
+	  body_t body = msg->body;
+
+	  /* notify the listeners */
+	  message_notification (msg, MU_EVT_MSG_DESTROY);
 	  /* header */
-	  header_destroy (&(msg->header), owner);
+	  header_destroy (&header, owner);
 	  /* attribute */
-	  attribute_destroy (&(msg->attribute), owner);
+	  attribute_destroy (&attribute, owner);
 	  /* istream */
-	  istream_destroy (&(msg->is), owner);
+	  istream_destroy (&is, owner);
 	  /* ostream */
-	  ostream_destroy (&(msg->os), owner);
+	  ostream_destroy (&os, owner);
 
 	  /* if sometype of floating/temporary message */
-	  if (msg->body)
+	  if (body)
 	    {
-	      body_t body = msg->body;
 	      if (body->file)
 		fclose (body->file);
 	      free (body->content);
-	      free (msg->body);
+	      free (body);
 	    }
+	  /* check again for resurrection before free()ing
+	   * the memory maybe it was clone, if yes we can not
+	   * free the pointer.
+	   *
+	   */
+	  if (msg->ref_count <= 0)
 	    free (msg);
 	}
       /* loose the link */
@@ -287,6 +344,73 @@ message_set_attribute  (message_t msg, attribute_t attribute, void *owner)
   return 0;
 }
 
+int
+message_register (message_t msg, size_t type,
+		  int (*action) (size_t typ, void *arg), void *arg)
+{
+  event_t event;
+  size_t i;
+  if (msg == NULL || action == NULL || type == 0)
+    return EINVAL;
+
+  /* find a free spot */
+  for (i = 0; i < msg->event_num; i++)
+    {
+      event = &(msg->event[i]);
+      if (event->_action == NULL)
+	{
+	  event->type = type;
+	  event->_action = action;
+	  event->arg = arg;
+	  return 0;
+	}
+    }
+  event = realloc (msg->event, (msg->event_num + 1)*sizeof (*event));
+  if (event == NULL)
+      return ENOMEM;
+  msg->event = event;
+  event[msg->event_num]._action = action;
+  event[msg->event_num].type = type;
+  event[msg->event_num].arg = arg;
+  msg->event_num++;
+  return 0;
+}
+
+int
+message_deregister (message_t msg, void *action)
+{
+  size_t i;
+  event_t event;
+  if (msg == NULL || action == NULL)
+    return EINVAL;
+
+  for (i = 0; i < msg->event_num; i++)
+    {
+      event = &(msg->event[i]);
+      if (event->_action == action)
+	{
+	  event->type = 0;
+	  event->_action = NULL;
+	  event->arg = NULL;
+	  return 0;
+	}
+    }
+  return ENOENT;
+}
+
+void
+message_notification (message_t msg, size_t type)
+{
+  size_t i;
+  event_t event;
+  for (i = 0; i < msg->event_num; i++)
+    {
+      event = &(msg->event[i]);
+      if ((event->_action) &&  (event->type & type))
+        event->_action (type, event->arg);
+    }
+}
+
 static int
 message_read (istream_t is, char *buf, size_t buflen,
 	      off_t off, ssize_t *pnread )

@@ -59,8 +59,14 @@ extern int message_set_size     __P ((message_t, size_t, void *owner));
 extern int message_get_attribute __P ((message_t, attribute_t *));
 extern int message_set_attribute __P ((message_t, attribute_t, void *owner));
 
-extern int message_clone __P ((message_t, message_t *));
-
+extern int message_clone __P ((message_t));
+
+/* events */
+#define MU_EVT_MSG_DESTROY 32
+extern int message_register __P ((message_t msg, size_t type,
+				  int (*action) (size_t typ, void *arg),
+				  void *arg));
+extern int message_deregister __P ((message_t msg, void *action));
 #ifdef _cpluscplus
 }
 #endif

@@ -22,6 +22,7 @@
 #include <header.h>
 #include <message.h>
 #include <mailbox.h>
+#include <event.h>
 
 #include <sys/types.h>
 #include <stdio.h>
@@ -30,6 +31,14 @@
 extern "C" {
 #endif
 
+#ifndef __P
+# ifdef __STDC__
+#  define __P(args) args
+# else
+#  define __P(args) ()
+# endif
+#endif /*__P */
+
 struct _body
 {
   FILE *file;
@@ -54,6 +63,9 @@ struct _message
   void *owner;
   int ref_count;
 
+  event_t event;
+  size_t event_num;
+
   int (*_get_header)  __P ((message_t msg, header_t *hdr));
   int (*_set_header)  __P ((message_t msg, header_t hdr, void *owner));
 
@@ -74,4 +86,5 @@ struct _message
 }
 #endif
 
+extern void message_notification (message_t msg, size_t type);
 #endif /* _MESSAGE_H */