On Sun, 23 Jul 2017 18:27:14 -0600, David Ahern wrote:
> On 7/23/17 5:54 PM, Jakub Kicinski wrote:
> > On Sat, 22 Jul 2017 00:20:50 -0700, Jakub Kicinski wrote:
> >> One thing which is not clear to me is how to get the association
> >> between programs and maps? Would we need to extend
> >> BPF_OBJ_GET_INFO_BY_FD to provide this info?
> >
> > Another thing that I can't find a way of doing is telling whether BPF fs
> > file is representing a map or a program. Is there a way to do this
> > today?
> >
>
> Once you have the fd you should be able to look at /proc/pid/fd/%d
>
> I have been using this:
>
> static int bpf_get_type(__u32 fd, __u32 pid, enum bpf_type *type)
> {
> char file[PATH_MAX];
> char buf[512];
> ssize_t n;
>
> *type = BPF_TYPE_UNSPEC;
>
> snprintf(file, sizeof(file), "/proc/%d/fd/%d", pid, fd);
>
> n = readlink(file, buf, sizeof(buf));
> if (n < 0)
> return -1;
>
> if (strstr(buf, "bpf-prog"))
> *type = BPF_TYPE_PROG;
> else if (strstr(buf, "bpf-map"))
> *type = BPF_TYPE_MAP;
>
> return 0;
> }
Great, that works! Thanks!
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