new file.

+/* GNU mailutils - a suite of utilities for electronic mail
+   Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+#include "imap4d.h"
+
+int
+imap4d_bye (int reason)
+{
+  struct passwd *pw = getpwuid (getuid ());
+  const char *username;
+  int status = EXIT_FAILURE;
+  username = (pw) ? pw->pw_name : "Unknown";
+
+  mailbox_close (mbox);
+  mailbox_destroy (&mbox);
+
+  switch (reason)
+    {
+    case ERR_NO_MEM:
+      util_out (RESP_BYE, "Server terminating no more ressources.");
+      syslog (LOG_ERR, "Out of memory");
+      break;
+
+    case ERR_SIGNAL:
+      util_out (RESP_BYE, "Quitting on signal");
+      syslog (LOG_ERR, "Quitting on signal");
+      break;
+
+    case ERR_TIMEOUT:
+      util_out (RESP_BYE, "Session timed out");
+      if (state == STATE_NONAUTH)
+        syslog (LOG_INFO, "Session timed out for no user");
+      else
+	syslog (LOG_INFO, "Session timed out for user: %s", username);
+      break;
+
+    case ERR_NO_OFILE:
+      syslog (LOG_INFO, "No socket to send to");
+      break;
+
+    case OK:
+      util_out (RESP_BYE, "Session terminating.");
+      if (state == STATE_NONAUTH)
+	syslog (LOG_INFO, "Session terminating");
+      else
+	syslog (LOG_INFO, "Session terminating for user: %s", username);
+      status = EXIT_SUCCESS;
+      break;
+
+    default:
+      util_out (RESP_BYE, "Quitting (reason unknown)");
+      syslog (LOG_ERR, "Unknown quit");
+      break;
+    }
+
+  closelog ();
+  exit (status);
+}

+/* GNU mailutils - a suite of utilities for electronic mail
+   Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+#define __USE_MISC
+#include "imap4d.h"
+
+RETSIGTYPE
+imap4d_sigchld (int signo)
+{
+  pid_t pid;
+  int status;
+
+  while ( (pid = waitpid(-1, &status, WNOHANG)) > 0)
+      --children;
+#ifndef HAVE_SIGACTION
+  /* On some system, signal implements the unreliable semantic and
+     has to be rearm.  */
+  signal (signo, imap4d_sigchld);
+#endif
+}
+
+/* Default signal handler to call the imap4d_bye() function */
+
+RETSIGTYPE
+imap4d_signal (int signo)
+{
+  extern const char *const sys_siglist[];
+  /* syslog (LOG_CRIT, "got signal %d", signo); */
+  syslog (LOG_CRIT, "got signal %s", sys_siglist[signo]);
+  /* Master process.  */
+  if (!ofile)
+    {
+       syslog (LOG_CRIT, "MASTER: exiting on signal");
+       exit (1); /* abort(); */
+    }
+
+  if (signo == SIGALRM)
+    imap4d_bye (ERR_TIMEOUT);
+  imap4d_bye (ERR_SIGNAL);
+}