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Date:   Sun, 12 Nov 2023 00:23:24 +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 Tue, 3 Oct 2023 at 21:01, Osama Muhammad <osmtendev@...il.com> wrote:
>
> 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.
Hi Shuah,
Any Feedback on this patch.

Thanks,
Osama
>

> 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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