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/* lib/systemd Code
* Copyright (C) 2016 Cumulus Networks, Inc.
* Donald Sharp
*
* This file is part of Quagga.
*
* Quagga 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.
*
* Quagga 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; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "thread.h"
#include "systemd.h"
#if defined HAVE_SYSTEMD
#include <systemd/sd-daemon.h>
#endif
/*
* Wrapper this silliness if we
* don't have systemd
*/
void systemd_send_information(const char *info)
{
#if defined HAVE_SYSTEMD
sd_notify(0, info);
#else
return;
#endif
}
/*
* A return of 0 means that we are not watchdoged
*/
static int systemd_get_watchdog_time(int the_process)
{
#if defined HAVE_SYSTEMD
uint64_t usec;
char *watchdog = NULL;
int ret;
ret = sd_watchdog_enabled(0, &usec);
/*
* If return is 0 -> we don't want watchdog
* if return is < 0, some sort of failure occurred
*/
if (ret < 0)
return 0;
/*
* systemd can return that this process
* is not the expected sender of the watchdog timer
* If we set the_process = 0 then we expect to
* be able to send the watchdog to systemd
* irrelevant of the pid of this process.
*/
if (ret == 0 && the_process)
return 0;
if (ret == 0 && !the_process) {
watchdog = getenv("WATCHDOG_USEC");
if (!watchdog)
return 0;
usec = atol(watchdog);
}
return (usec / 1000000) / 3;
#else
return 0;
#endif
}
void systemd_send_stopping(void)
{
systemd_send_information("STOPPING=1");
}
/*
* How many seconds should we wait between watchdog sends
*/
int wsecs = 0;
struct thread_master *systemd_master = NULL;
static int systemd_send_watchdog(struct thread *t)
{
systemd_send_information("WATCHDOG=1");
thread_add_timer(systemd_master, systemd_send_watchdog, NULL, wsecs,
NULL);
return 1;
}
void systemd_send_started(struct thread_master *m, int the_process)
{
assert(m != NULL);
wsecs = systemd_get_watchdog_time(the_process);
systemd_master = m;
systemd_send_information("READY=1");
if (wsecs != 0)
thread_add_timer(m, systemd_send_watchdog, m, wsecs, NULL);
}
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