[CRIU] [RFC] criu: Drop prlimit compat layer

[Pavel Emelyanov]

> -int prlimit(pid_t pid, int resource, const struct rlimit *new_rlimit, struct rlimit *old_rlimit)
> -{
> -	struct rlimit64 new_rlimit64_mem;
> -	struct rlimit64 old_rlimit64_mem;
> -	struct rlimit64 *new_rlimit64 = NULL;
> -	struct rlimit64 *old_rlimit64 = NULL;
> -	int ret;
> -
> -	if (old_rlimit)
> -		old_rlimit64 = &old_rlimit64_mem;
> -
> -	if (new_rlimit) {
> -		if (new_rlimit->rlim_cur == RLIM_INFINITY)
> -			new_rlimit64_mem.rlim_cur = RLIM64_INFINITY;
> -		else
> -			new_rlimit64_mem.rlim_cur = new_rlimit->rlim_cur;
> -		if (new_rlimit->rlim_max == RLIM_INFINITY)
> -			new_rlimit64_mem.rlim_max = RLIM64_INFINITY;
> -		else
> -			new_rlimit64_mem.rlim_max = new_rlimit->rlim_max;
> -		new_rlimit64 = &new_rlimit64_mem;
> -	}

You've killed the conversions we did for INIFINITY values. Changing struct rlimit
to struct rlimit64 works only for 64 bit platforms.

> -
> -	ret = sys_prlimit64(pid, resource, new_rlimit64, old_rlimit64);
> -
> -	if (ret == 0 && old_rlimit) {
> -		old_rlimit->rlim_cur = old_rlimit64_mem.rlim_cur;
> -		if (old_rlimit->rlim_cur != old_rlimit64_mem.rlim_cur) {
> -			if (new_rlimit) {
> -				errno = EOVERFLOW;
> -				return -1;
> -			}
> -			old_rlimit->rlim_cur = RLIM_INFINITY;
> -		}
> -		old_rlimit->rlim_max = old_rlimit64_mem.rlim_max;
> -		if (old_rlimit->rlim_max != old_rlimit64_mem.rlim_max) {
> -			if (new_rlimit) {
> -				errno = EOVERFLOW;
> -				return -1;
> -			}
> -			old_rlimit->rlim_max = RLIM_INFINITY;
> -		}
> -	} else if (ret) {
> -		errno = -ret;
> -		ret = -1;
> -	}
> -
> -	return ret;
> -}
> -