[PATCH] tests: add chmod.test

[Anchit Jain]

05.03.2016, 01:17, "Dmitry V. Levin" <ldv at altlinux.org>:
> On Fri, Mar 04, 2016 at 07:26:35PM +0000, Anchit Jain wrote:
>>  diff --git a/tests/chmod.c b/tests/chmod.c
>>  new file mode 100644
>>  index 0000000..b6bb2fd
>>  --- /dev/null
>>  +++ b/tests/chmod.c
>>  @@ -0,0 +1,62 @@
>>  +/*
>>  + * Copyright (c) 2015-2016 Anchit Jain <anchitjain1234 at gmail.com>
>>  + * All rights reserved.
>
> Have you really started working on this test last year?
>
>>  + int create_file_desc = open("chmod_test_file", O_CREAT|O_RDONLY, 0400);
>
> Do you plan to use other descriptors besides this one?
> If not, "create_file_desc" is too verbose.

Would file_desc work?

>
>>  + if(create_file_desc == -1)
>
> Please add a space after "if" in all "if" statements.
>
>>  + perror_msg_and_fail("chmod -1");
>
> What does this "chmod -1" mean?

What should be the error message? Like chmod failed due to this error?

>
>>  + if(syscall(__NR_chmod, "chmod_test_file", 0600) != 0)
>>  + perror_msg_and_fail("chmod -1");
>
> Let me repeat: chmod syscall can legitimately fail with ENOSYS.

How can I check that?

>
>>  + unlink("chmod_test_file");
>
> Let's practice defensive programming and check unlink return code as well.
>
>>  + if(syscall(__NR_chmod, "chmod_test_file", 0600) != -1)
>>  + perror_msg_and_fail("chmod -1");
>
> What does "chmod -1" mean this time?
>
>>  + printf("chmod(\"chmod_test_file\", 0600) = -1 ENOENT (%m)\n");
>
> Parametrising the name of test file might make the whole test more
> readable. Assuming you have
>         static const char fname[] = "chmod_test_file";
> defined earlier in the test, all statements that use this test file name
> will be easier to read. Compare e.g.
>         syscall(__NR_chmod, "chmod_test_file", 0600)
> with
>         syscall(__NR_chmod, fname, 0600)
> and
>         printf("chmod(\"chmod_test_file\", 0600) = -1 ENOENT (%m)\n");
> with
>         printf("chmod(\"%s\", 0600) = -1 ENOENT (%m)\n", fname);
>
>>  +#endif
>>  \ No newline at end of file
>
> Why is that?
>
> --
> ldv
> ,
>
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> ,
>
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