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/* This file is part of fileserv.
Copyright (C) 2017 Sergey Poznyakoff
Fileserv 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, or (at your option)
any later version.
Fileserv 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 fileserv. If not, see <http://www.gnu.org/licenses/>. */
#include "fileserv.h"
#include <string.h>
#include <errno.h>
#include <signal.h>
char *pidfile;
void
pidfile_remove(void)
{
if (pidfile && unlink(pidfile))
error("cannot unlink pidfile `%s': %s",
pidfile, strerror(errno));
}
void
pidfile_create(void)
{
FILE *fp;
if (!pidfile)
return;
fp = fopen(pidfile, "w");
if (!fp) {
error("cannot create pidfile `%s': %s",
pidfile, strerror(errno));
exit(1);
}
fprintf(fp, "%lu", (unsigned long) getpid());
fclose(fp);
}
/* Check whether pidfile exists and if so, whether its PID is still
active. Exit if it is. */
void
pidfile_check(void)
{
unsigned long pid;
FILE *fp;
if (!pidfile)
return;
fp = fopen(pidfile, "r");
if (fp) {
if (fscanf(fp, "%lu", &pid) != 1) {
error("cannot get pid from pidfile `%s'", pidfile);
} else {
if (kill(pid, 0) == 0) {
error("%s appears to run with pid %lu. "
"If it does not, remove `%s' and retry.",
progname, pid, pidfile);
exit(1);
}
}
fclose(fp);
if (unlink(pidfile)) {
error("cannot unlink pidfile `%s': %s",
pidfile, strerror(errno));
exit(1);
}
} else if (errno != ENOENT) {
error("cannot open pidfile `%s': %s",
pidfile, strerror(errno));
exit(1);
}
}
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