linux-kernel - Re: [PATCH 3/3] selftests: add readfile(2) selftests

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Message-ID: <CAMuHMdXck1u+Djv1xOvRA7riMN4m3qp8o4zmXVvqrC1S+0fifA@mail.gmail.com>
Date:   Sat, 4 Jul 2020 20:38:26 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-man@...r.kernel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH 3/3] selftests: add readfile(2) selftests

Hi Greg,

On Sat, Jul 4, 2020 at 4:05 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> Test the functionality of readfile(2) in various ways.
>
> Also provide a simple speed test program to benchmark using readfile()
> instead of using open()/read()/close().
>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Any benchmark results to share?

> --- /dev/null
> +++ b/tools/testing/selftests/readfile/readfile.c

> +static void readfile(const char *filename)
> +{
> +//     int root_fd;

???

> +       unsigned char buffer[16000];
> +       int retval;
> +
> +       memset(buffer, 0x00, sizeof(buffer));
> +
> +//     root_fd = open("/", O_DIRECTORY);
> +//     if (root_fd == -1)
> +//             ksft_exit_fail_msg("error with root_fd\n");

???

> +
> +       retval = sys_readfile(root_fd, filename, &buffer[0], sizeof(buffer), 0);
> +
> +//     close(root_fd);
> +
> +       if (retval <= 0)
> +               ksft_test_result_fail("readfile() test of filename=%s failed with retval %d\n",
> +                                     filename, retval);
> +       else
> +               ksft_test_result_pass("readfile() test of filename=%s succeeded with retval=%d\n",
> +                                     filename, retval);
> +//     buffer='%s'\n",
> +//            filename, retval, &buffer[0]);
> +
> +}
> +
> +
> +int main(int argc, char *argv[])
> +{
> +       ksft_print_header();
> +       ksft_set_plan(10);
> +
> +       test_readfile_supported();      // 1 test
> +
> +       test_sysfs_files();             // 1 test
> +
> +       test_filesizes();               // 6 tests
> +
> +       setup_tmpdir();
> +
> +       readfile(TEST_FILE1);
> +       readfile(TEST_FILE2);
> +//     readfile(TEST_FILE4);

???

> +
> +       teardown_tmpdir();
> +
> +       if (ksft_get_fail_cnt())
> +               return ksft_exit_fail();
> +
> +       return ksft_exit_pass();
> +}

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds