/*
* This file is part of the Distributed Network Block Device 3
*
* Copyright(c) 2011-2012 Johann Latocha <johann@latocha.de>
*
* This file may be licensed under the terms of of the
* GNU General Public License Version 2 (the ``GPL'').
*
* Software distributed under the License is distributed
* on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
* express or implied. See the GPL for the specific language
* governing rights and limitations.
*
* You should have received a copy of the GPL along with this
* program. If not, go to http://www.gnu.org/licenses/gpl.html
* or write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "utils.h"
#include "hashtable.h"
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
void write_pid_file(pid_t pid)
{
FILE *f = fopen(SERVER_PID_FILE, "w");
if(f != NULL)
{
fprintf(f, "%i", pid);
fclose(f);
}
else
{
printf("ERROR: Couldn't write pid file (%s).\n", SERVER_PID_FILE);
}
}
pid_t read_pid_file()
{
pid_t pid = 0;
FILE *f = fopen(SERVER_PID_FILE, "r");
if(f != NULL)
{
fscanf(f, "%i", &pid);
fclose(f);
}
else
{
printf("ERROR: Couldn't read pid file (%s).\n", SERVER_PID_FILE);
}
return pid;
}
void delete_pid_file()
{
if (unlink(SERVER_PID_FILE) != 0)
{
printf("ERROR: Couldn't delete pid file (%s).\n", SERVER_PID_FILE);
}
}
void load_config(char* config_file_name)
{
ht_create();
FILE *config_file = fopen(config_file_name, "r");
if (config_file == NULL)
{
printf("ERROR: Config file not found: %s\n", config_file_name);
exit(EXIT_FAILURE);
}
char line[MAX_FILE_NAME + 1 + MAX_FILE_ID];
char* image_name = NULL;
char* image_id = NULL;
while (fgets(line, sizeof(line), config_file) != NULL)
{
sscanf(line, "%as %as", &image_name, &image_id);
if (ht_insert(image_id, image_name) < 0)
{
printf("ERROR: Image name or ID is too big\n");
exit(EXIT_FAILURE);
}
}
fclose(config_file);
}
void reload_config(char* config_file_name)
{
ht_destroy();
load_config(config_file_name);
}
void send_signal(int signum)
{
pid_t pid = read_pid_file();
if (pid != 0)
{
if (kill(pid, signum) != 0)
{
printf("ERROR: dnbd3-server is not running\n");
delete_pid_file();
}
}
else
{
printf("ERROR: dnbd3-server is not running\n");
}
}
