[CRIU] [PATCH] compel: new catch and "release at" helpers added

[Pavel Emelyanov]

On 03/16/2017 02:43 PM, Stanislav Kinsburskiy wrote:
> These helpers are compel_run_at split result.

BTW, the compel_run_at itself seems to be unused.

> IOW, it's an asynchronious way
> of calling some binary code in remote process and cathing it after it's done.
> 
> Signed-off-by: Stanislav Kinsburskiy <skinsbursky at virtuozzo.com>
> ---
>  compel/include/uapi/infect.h |    2 ++
>  compel/src/lib/infect.c      |   14 ++++++++++++++
>  2 files changed, 16 insertions(+)
> 
> diff --git a/compel/include/uapi/infect.h b/compel/include/uapi/infect.h
> index da0ca3a..aebb77c 100644
> --- a/compel/include/uapi/infect.h
> +++ b/compel/include/uapi/infect.h
> @@ -66,6 +66,8 @@ extern int compel_syscall(struct parasite_ctl *ctl, int nr, long *ret,
>  		unsigned long arg6);
>  extern int compel_run_in_thread(struct parasite_thread_ctl *tctl, unsigned int cmd);
>  extern int compel_run_at(struct parasite_ctl *ctl, unsigned long ip, user_regs_struct_t *ret_regs);
> +extern int compel_release_at(struct parasite_ctl *ctl, unsigned long ip);
> +extern int compel_catch(struct parasite_ctl *ctl, user_regs_struct_t *ret_regs);
>  
>  /*
>   * The PTRACE_SYSCALL will trap task twice -- on
> diff --git a/compel/src/lib/infect.c b/compel/src/lib/infect.c
> index c024250..a2cb5d6 100644
> --- a/compel/src/lib/infect.c
> +++ b/compel/src/lib/infect.c
> @@ -581,6 +581,20 @@ int compel_run_at(struct parasite_ctl *ctl, unsigned long ip, user_regs_struct_t
>  	return ret;
>  }
>  
> +int compel_release_at(struct parasite_ctl *ctl, unsigned long ip)
> +{
> +	user_regs_struct_t regs = ctl->orig.regs;
> +
> +	return parasite_run(ctl->rpid, PTRACE_CONT, ip, 0, &regs, &ctl->orig);
> +}
> +
> +int compel_catch(struct parasite_ctl *ctl, user_regs_struct_t *ret_regs)
> +{
> +	user_regs_struct_t regs;
> +
> +	return parasite_trap(ctl, ctl->rpid, ret_regs ? ret_regs : &regs, &ctl->orig);
> +}
> +
>  static int accept_tsock(struct parasite_ctl *ctl)
>  {
>  	int sock;
> 
> .
>