[CRIU] Re: [PATCH v3 3/4] IPC: restore shared memory

[Pavel Emelyanov]

On 02/08/2012 09:27 PM, Kinsbursky Stanislav wrote:
> 
> 
> Signed-off-by: Stanislav Kinsbursky <skinsbursky at parallels.com>
> 
> ---
>  ipc_ns.c |  109 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  1 files changed, 107 insertions(+), 2 deletions(-)
> 
> diff --git a/ipc_ns.c b/ipc_ns.c
> index eda3399..5c4d27f 100644
> --- a/ipc_ns.c
> +++ b/ipc_ns.c
> @@ -13,6 +13,14 @@
>  #include "namespaces.h"
>  #include "sysctl.h"
>  
> +#ifndef IPC_PRESET
> +#define IPC_PRESET		00040000
> +#endif
> +
> +#ifndef SHM_SET
> +#define SHM_SET			15
> +#endif
> +
>  static void print_ipc_seg(const struct ipc_seg *seg)
>  {
>  	pr_info("id: %-10d key: 0x%08x ", seg->id, seg->key);
> @@ -160,8 +168,12 @@ static int dump_ipc_shm(int fd)
>  		int id, ret;
>  
>  		id = shmctl(i, SHM_STAT, &ds);
> -		if (id < 0)
> -			continue;
> +		if (id < 0) {
> +			if (errno == EINVAL)
> +				continue;
> +			pr_perror("Failed to get stats for IPC shared memory\n");
> +			break;
> +		}
>  		ret = dump_ipc_shm_seg(fd, id, &ds);
>  		if (ret < 0)
>  			return ret;

What does this hunk do here?