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/* wydawca - automatic release submission daemon
Copyright (C) 2007, 2009 Sergey Poznyakoff
Wydawca 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 3 of the License, or (at your
option) any later version.
Wydawca 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 wydawca. If not, see <http://www.gnu.org/licenses/>. */
#include "wydawca.h"
char *pidfile = LOCALSTATEDIR "/run/wydawca.pid";
int force_startup;
void
remove_pidfile (void)
{
unlink (pidfile);
}
void
check_pidfile ()
{
FILE *fp = fopen (pidfile, "r+");
if (fp)
{
unsigned long pid;
if (fscanf (fp, "%ul\n", &pid) != 1)
{
logmsg (LOG_ERR, _("malformed pidfile %s"), pidfile);
if (!force_startup)
exit (1);
}
else
{
if (kill (pid, 0))
{
if (errno != ESRCH)
{
logmsg (LOG_ERR,
_("cannot verify if PID %lu is running: %s"),
pid, strerror (errno));
if (!force_startup)
exit (1);
}
}
else if (!force_startup)
{
logmsg (LOG_ERR,
_("another wydawca instance may be running (PID %lu)"),
pid);
exit (1);
}
}
logmsg (LOG_NOTICE, _("replacing pidfile %s (PID %lu)"),
pidfile, pid);
fseek (fp, 0, SEEK_SET);
}
else if (errno != ENOENT)
{
logmsg (LOG_ERR, _("cannot open pidfile %s: %s"), pidfile,
strerror (errno));
exit (1);
}
else
{
fp = fopen (pidfile, "w");
if (!fp)
{
logmsg (LOG_ERR,
_("cannot open pidfile %s for writing: %s"),
pidfile, strerror (errno));
exit (1);
}
}
fprintf (fp, "%lu\n", getpid ());
fclose (fp);
atexit (remove_pidfile);
}
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