/*
* Calculate a container's cgroup path for a particular subsystem. This
* is the cgroup path relative to the root of the cgroup filesystem.
* @path: A char ** into which we copy the char* containing the answer
* @subsystem: the cgroup subsystem of interest (i.e. freezer)
* @name: container name
* @lxcpath: the lxcpath in which the container is running.
*
* Returns 0 on success, -1 on error.
*
* Note that the char* copied into *path is a static char[MAXPATHLEN] in
* commands.c:receive_answer(). It should not be freed.
*/
extern int lxc_get_cgpath(const char **path, const char *subsystem, const char *name, const char *lxcpath)
{
struct lxc_command command = {
.request = { .type = LXC_COMMAND_CGROUP },
};
int ret, stopped = 0;
ret = lxc_command(name, &command, &stopped, lxcpath);
if (ret < 0) {
if (!stopped)
ERROR("failed to send command");
return -1;
}
if (!ret) {
WARN("'%s' has stopped before sending its state", name);
return -1;
}
if (command.answer.ret < 0 || command.answer.pathlen < 0) {
ERROR("failed to get state for '%s': %s",
name, strerror(-command.answer.ret));
return -1;
}
*path = command.answer.path;
return 0;
}
static lxc_state_t __lxc_getstate(const char *name)
{
struct lxc_command command = {
.request = { .type = LXC_COMMAND_STATE },
};
int ret, stopped = 0;
ret = lxc_command(name, &command, &stopped);
if (ret < 0 && stopped)
return STOPPED;
if (ret < 0) {
ERROR("failed to send command");
return -1;
}
if (!ret) {
WARN("'%s' has stopped before sending its state", name);
return -1;
}
if (command.answer.ret < 0) {
ERROR("failed to get state for '%s': %s",
name, strerror(-command.answer.ret));
return -1;
}
DEBUG("'%s' is in '%s' state", name, lxc_state2str(command.answer.ret));
return command.answer.ret;
}
