tools: bpftool: fix return value when all eBPF programs have been shown

Change the program to have a more consistent return code. Specifically,
do not make bpftool return an error code simply because it reaches the
end of the list of the eBPF programs to show.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index aa6d72ea3807..ede7957adcd9 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -275,8 +275,10 @@ static int do_show(int argc, char **argv)
         while (true) {
                 err = bpf_prog_get_next_id(id, &id);
                 if (err) {
-                        if (errno == ENOENT)
+                        if (errno == ENOENT) {
+                                err = 0;
                                 break;
+                        }
                         err("can't get next program: %s\n", strerror(errno));
                         if (errno == EINVAL)
                                 err("kernel too old?\n");