[CRIU] [PATCH 4/8] vzctl: save PID of init in a state file

[Kir Kolyshkin]

On 05/15/2013 09:10 AM, Andrey Vagin wrote:
> It will be used for checkpointing this CT
>
> Signed-off-by: Andrey Vagin <avagin at openvz.org>
> ---
>   src/lib/hooks_ct.c | 20 ++++++++++++++++++--
>   1 file changed, 18 insertions(+), 2 deletions(-)
>
> diff --git a/src/lib/hooks_ct.c b/src/lib/hooks_ct.c
> index 0d4e439..3c82823 100644
> --- a/src/lib/hooks_ct.c
> +++ b/src/lib/hooks_ct.c
> @@ -86,6 +86,10 @@ static int ct_destroy(vps_handler *h, envid_t veid, const vps_res *res)
>   
>   	snprintf(ctpath, STR_SIZE, "%s/%d", NETNS_RUN_DIR, veid);
>   	unlink(ctpath);
> +
> +	get_state_file(veid, res->env.statedir, ctpath, sizeof(ctpath));
> +	unlink(ctpath);
> +
>   	return destroy_container(veid);
>   }
>   
> @@ -230,7 +234,8 @@ static int ct_env_create_real(struct arg_start *arg)
>   	long stack_size;
>   	char *child_stack;
>   	int clone_flags;
> -	int ret;
> +	int ret, fd;
> +	char pidpath[STR_SIZE];
>   
>   	stack_size = get_pagesize();
>   	if (stack_size < 0)
> @@ -251,15 +256,26 @@ static int ct_env_create_real(struct arg_start *arg)
>   	clone_flags |= CLONE_NEWUTS|CLONE_NEWPID|CLONE_NEWIPC;
>   	clone_flags |= CLONE_NEWNET|CLONE_NEWNS;
>   
> +	get_state_file(arg->veid, arg->res->env.statedir, pidpath, sizeof(pidpath));
> +	fd = open(pidpath, O_WRONLY | O_TRUNC | O_CREAT | O_CLOEXEC, 0666);

I hope you are not serious about 0666 here.

> +	if (fd == -1) {
> +		logger(-1, errno, "Unable to create a state file %s", pidpath);
> +		return VZ_RESOURCE_ERROR;
> +	}
> +
>   	ret = clone(_env_create, child_stack, clone_flags, arg);
>   	if (ret  < 0) {
> +		close(fd);
>   		logger(-1, errno, "Unable to clone");
>   		/* FIXME: remove ourselves from container first */
>   		destroy_container(arg->veid);
>   		return VZ_RESOURCE_ERROR;
>   	}
>   
> -	return 0;
> +	dprintf(fd, "%d", ret);
> +	close(fd);
> +
> +	return ret;
>   }
>   
>   int ct_env_create(struct arg_start *arg)