[PATCH 1/2] Use libsupport for tst-spawn.c

[Florian Weimer]

* adhemerval zanella:

>    /* First the easy part: read from the file descriptor which is
>       supposed to be open.  */
> +  TEST_VERIFY_EXIT (lseek (fd2, 0, SEEK_CUR) == strlen (fd2string));
>    /* The duped descriptor must have the same position.  */
> +  TEST_VERIFY_EXIT (lseek (fd4, 0, SEEK_CUR) == strlen (fd2string));
> +  TEST_VERIFY_EXIT (lseek (fd2, 0, SEEK_SET) == 0);
> +  TEST_VERIFY_EXIT (lseek (fd4, 0, SEEK_CUR) == 0);
> +  TEST_VERIFY_EXIT (read (fd2, buf, sizeof buf) == strlen (fd2string));

These can use TEST_COMPARE and xlseek.

> +  TEST_VERIFY_EXIT (memcmp (fd2string, buf, strlen (fd2string)) == 0);

Use TEST_COMPARE_BLOB?

>    /* Now read from the third file.  */
> +  TEST_VERIFY_EXIT (read (fd3, buf, sizeof buf) == strlen (fd3string));
> +  TEST_VERIFY_EXIT (memcmp (fd3string, buf, strlen (fd3string)) == 0);
>    /* Try to write to the file.  This should not be allowed.  */
> +  TEST_VERIFY_EXIT (write (fd3, "boo!", 4) == -1 && errno == EBADF);
>  
>    /* Now try to read the first file.  First make sure it is not opened.  */
> +  TEST_VERIFY_EXIT (lseek (fd1, 0, SEEK_CUR) == (off_t) -1
> +		    && errno == EBADF);

Use too TEST_COMPARE calls?

>  
>    /* Now open the file and read it.  */
> +  TEST_VERIFY_EXIT ((fd1 = open (name, O_RDONLY)) != -1);

You can use xopen.

> +  TEST_VERIFY_EXIT (read (fd1, buf, sizeof buf) == strlen (fd1string));
> +  TEST_VERIFY_EXIT (memcmp (fd1string, buf, strlen (fd1string)) == 0);

Likewise TEST_COMPARE.

More instances below, sorry.

Thanks,
Florian