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/*
* lxc: linux Container library
*
* (C) Copyright IBM Corp. 2007, 2008
*
* Authors:
* Daniel Lezcano <dlezcano at fr.ibm.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define _GNU_SOURCE
#include <stdio.h>
#undef _GNU_SOURCE
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/param.h>
#include "error.h"
#include <lxc/log.h>
#include <lxc/cgroup.h>
lxc_log_define(lxc_freezer, lxc);
static int freeze_unfreeze(const char *name, int freeze)
{
char *nsgroup;
char freezer[MAXPATHLEN], *f;
char tmpf[32];
int fd, ret;
ret = lxc_cgroup_path_get(&nsgroup, "freezer", name);
if (ret)
return -1;
snprintf(freezer, MAXPATHLEN, "%s/freezer.state", nsgroup);
fd = open(freezer, O_RDWR);
if (fd < 0) {
SYSERROR("failed to open freezer for '%s'", name);
return -1;
}
if (freeze) {
f = "FROZEN";
ret = write(fd, f, strlen(f) + 1);
} else {
f = "THAWED";
ret = write(fd, f, strlen(f) + 1);
/* compatibility code with old freezer interface */
if (ret < 0) {
f = "RUNNING";
ret = write(fd, f, strlen(f) + 1) < 0;
}
}
if (ret < 0) {
SYSERROR("failed to write '%s' to '%s'", f, freezer);
goto out;
}
while (1) {
ret = lseek(fd, 0L, SEEK_SET);
if (ret < 0) {
SYSERROR("failed to lseek on file '%s'", freezer);
goto out;
}
ret = read(fd, tmpf, sizeof(tmpf));
if (ret < 0) {
SYSERROR("failed to read to '%s'", freezer);
goto out;
}
ret = strncmp(f, tmpf, strlen(f));
if (!ret)
break; /* Success */
sleep(1);
ret = lseek(fd, 0L, SEEK_SET);
if (ret < 0) {
SYSERROR("failed to lseek on file '%s'", freezer);
goto out;
}
ret = write(fd, f, strlen(f) + 1);
if (ret < 0) {
SYSERROR("failed to write '%s' to '%s'", f, freezer);
goto out;
}
}
out:
close(fd);
return ret;
}
int lxc_freeze(const char *name)
{
return freeze_unfreeze(name, 1);
}
int lxc_unfreeze(const char *name)
{
return freeze_unfreeze(name, 0);
}
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