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/*
* Copyright (c) 1998-2003 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any other legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: idle_poll.c,v 1.12 2005/12/09 19:15:35 murch Exp $ */
#include <config.h>
#include <syslog.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <signal.h>
#include "idle.h"
#include "global.h"
const char *idle_method_desc = "poll";
/* function to report mailbox updates to the client */
static idle_updateproc_t *idle_update = NULL;
/* how often to poll the mailbox */
static time_t idle_period = -1;
int idle_enabled(void)
{
/* get polling period */
if (idle_period == -1) {
idle_period = config_getint(IMAPOPT_IMAPIDLEPOLL);
if (idle_period < 0) idle_period = 0;
}
/* a period of zero disables IDLE */
return idle_period;
}
static void idle_poll(int sig __attribute__((unused)))
{
idle_update(IDLE_MAILBOX|IDLE_ALERT);
alarm(idle_period);
}
int idle_init(idle_updateproc_t *proc)
{
struct sigaction action;
idle_update = proc;
/* Setup the mailbox polling function to be called at 'idle_period'
seconds from now */
sigemptyset(&action.sa_mask);
action.sa_flags = 0;
#ifdef SA_RESTART
action.sa_flags |= SA_RESTART;
#endif
action.sa_handler = idle_poll;
if (sigaction(SIGALRM, &action, NULL) < 0) {
syslog(LOG_ERR, "sigaction: %m");
/* Cancel receiving signals */
idle_done(NULL);
return 0;
}
return 1;
}
void idle_start(struct mailbox *mailbox __attribute__((unused)))
{
alarm(idle_period);
}
void idle_done(struct mailbox *mailbox __attribute__((unused)))
{
/* Remove the polling function */
signal(SIGALRM, SIG_IGN);
idle_update = NULL;
}
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