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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 Quagga; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, 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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