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/*
* 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 "server.h"
#include "utils.h"
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/stat.h>
void dnbd3_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 dnbd3_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 dnbd3_delete_pid_file()
{
if (unlink(SERVER_PID_FILE) != 0)
{
printf("ERROR: Couldn't delete pid file (%s).\n", SERVER_PID_FILE);
}
}
void dnbd3_send_signal(int signum)
{
pid_t pid = dnbd3_read_pid_file();
if (pid != 0)
{
if (kill(pid, signum) != 0)
{
printf("ERROR: dnbd3-server is not running\n");
dnbd3_delete_pid_file();
}
}
else
{
printf("ERROR: dnbd3-server is not running\n");
}
}
void dnbd3_load_config(char *file)
{
int fd;
gint i;
GKeyFile* gkf;
gkf = g_key_file_new();
if (!g_key_file_load_from_file(gkf, file, G_KEY_FILE_NONE, NULL))
{
printf("ERROR: Config file not found: %s\n", file);
exit(EXIT_FAILURE);
}
gchar **groups = NULL;
groups = g_key_file_get_groups(gkf, &_num_images);
_images = calloc(_num_images, sizeof(dnbd3_image_t));
for (i = 0; i < _num_images; i++)
{
_images[i].file = g_key_file_get_string(gkf, groups[i], "file", NULL);
_images[i].servers = g_key_file_get_string_list(gkf, groups[i], "servers", &_images[i].num, NULL);
_images[i].vid = g_key_file_get_integer(gkf, groups[i], "vid", NULL);
_images[i].rid = g_key_file_get_integer(gkf, groups[i], "rid", NULL);
fd = open(_images[i].file, O_RDONLY);
if (fd > 0)
{
struct stat st;
fstat(fd, &st);
_images[i].filesize = st.st_size;
}
else
{
printf("ERROR: Image not found: %s\n", _images[i].file);
}
close(fd);
}
g_strfreev(groups);
g_key_file_free (gkf);
}
void dnbd3_reload_config(char* config_file_name)
{
free(_images);
_num_images = 0;
dnbd3_load_config(config_file_name);
}
dnbd3_image_t* dnbd3_get_image(int vid, int rid)
{
// TODO: find better data structure
dnbd3_image_t *result = NULL;
int i;
for (i = 0; i < _num_images; ++i) {
if (_images[i].vid == vid && _images[i].rid == rid)
result = &_images[i];
}
return result;
}
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