From: John Fastabend Date: Tue, 29 Sep 2020 20:07:49 +0000 (-0700) Subject: bpf, selftests: Fix warning in snprintf_btf where system() call unchecked X-Git-Tag: v5.15~2655^2~96^2~11 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c810b31ecb036b94629726d6219ad21b0c7a64a2;p=platform%2Fkernel%2Flinux-starfive.git bpf, selftests: Fix warning in snprintf_btf where system() call unchecked On my systems system() calls are marked with warn_unused_result apparently. So without error checking we get this warning, ./prog_tests/snprintf_btf.c:30:9: warning: ignoring return value of ‘system’, declared with attribute warn_unused_result[-Wunused-result] Also it seems like a good idea to check the return value anyways to ensure ping exists even if its seems unlikely. Fixes: 076a95f5aff2c ("selftests/bpf: Add bpf_snprintf_btf helper tests") Signed-off-by: John Fastabend Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/160141006897.25201.12095049414156293265.stgit@john-Precision-5820-Tower --- diff --git a/tools/testing/selftests/bpf/prog_tests/snprintf_btf.c b/tools/testing/selftests/bpf/prog_tests/snprintf_btf.c index 3c63a70..686b40f 100644 --- a/tools/testing/selftests/bpf/prog_tests/snprintf_btf.c +++ b/tools/testing/selftests/bpf/prog_tests/snprintf_btf.c @@ -27,7 +27,9 @@ void test_snprintf_btf(void) goto cleanup; /* generate receive event */ - (void) system("ping -c 1 127.0.0.1 > /dev/null"); + err = system("ping -c 1 127.0.0.1 > /dev/null"); + if (CHECK(err, "system", "ping failed: %d\n", err)) + goto cleanup; if (bss->skip) { printf("%s:SKIP:no __builtin_btf_type_id\n", __func__);