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Date:   Tue, 3 Oct 2023 21:01:31 +0500
From:   Osama Muhammad <osmtendev@...il.com>
To:     shuah@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2] selftests: prctl: Add prctl test for PR_GET_NAME

On Sun, 20 Aug 2023 at 19:14, Osama Muhammad <osmtendev@...il.com> wrote:
>
> This patch covers the testing of PR_GET_NAME by
> reading it's value from proc/self/task/pid/comm
> and matching it with the value returned by PR_GET_NAME.
> If the values are matched then it's successful, otherwise
> it fails.

Any Feedback on this patch?

>
> changes since v1:
>         - Handled fscanf,fopen error checking.
>         - Defined MAX_PATH_LEN.
>
> Signed-off-by: Osama Muhammad <osmtendev@...il.com>
> ---
>  .../selftests/prctl/set-process-name.c        | 32 +++++++++++++++++++
>  1 file changed, 32 insertions(+)
>
> diff --git a/tools/testing/selftests/prctl/set-process-name.c b/tools/testing/selftests/prctl/set-process-name.c
> index 3bc5e0e09..562f707ba 100644
> --- a/tools/testing/selftests/prctl/set-process-name.c
> +++ b/tools/testing/selftests/prctl/set-process-name.c
> @@ -12,6 +12,7 @@
>  #define CHANGE_NAME "changename"
>  #define EMPTY_NAME ""
>  #define TASK_COMM_LEN 16
> +#define MAX_PATH_LEN 50
>
>  int set_name(char *name)
>  {
> @@ -47,6 +48,35 @@ int check_null_pointer(char *check_name)
>         return res;
>  }
>
> +int check_name(void)
> +{
> +
> +       int pid;
> +
> +       pid = getpid();
> +       FILE *fptr = NULL;
> +       char path[MAX_PATH_LEN] = {};
> +       char name[TASK_COMM_LEN] = {};
> +       char output[TASK_COMM_LEN] = {};
> +       int j;
> +
> +       j = snprintf(path, MAX_PATH_LEN, "/proc/self/task/%d/comm", pid);
> +       fptr = fopen(path, "r");
> +       if (!fptr)
> +               return -EIO;
> +
> +       fscanf(fptr, "%s", output);
> +       if (ferror(fptr))
> +               return -EIO;
> +
> +       int res = prctl(PR_GET_NAME, name, NULL, NULL, NULL);
> +
> +       if (res < 0)
> +               return -errno;
> +
> +       return !strcmp(output, name);
> +}
> +
>  TEST(rename_process) {
>
>         EXPECT_GE(set_name(CHANGE_NAME), 0);
> @@ -57,6 +87,8 @@ TEST(rename_process) {
>
>         EXPECT_GE(set_name(CHANGE_NAME), 0);
>         EXPECT_LT(check_null_pointer(CHANGE_NAME), 0);
> +
> +       EXPECT_TRUE(check_name());
>  }
>
>  TEST_HARNESS_MAIN
> --
> 2.34.1
>

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