[LTP] [PATCH 1/2] lib/tst_test: setup TCID earlier in do_setup()

[Alexey Kodanev]

Hi Li, Cyril,
On 25.06.2021 12:27, Cyril Hrubis wrote:
> Hi!
>> TCID can be NULL in tst_tmpdir() because it is set after do_setup():
>>
>>     tst_run_tcases()
>>         do_setup()
>>             ...
>>             tid = get_tid();
>>             ...
>>             tst_tmpdir()  /* using TCID here */
>>         TCID = tid;
> 
> Good catch, I wonder how we missed this for so long...

Ran into this with musl, it pastes "(null)" to the tmpdir path if
TCID is NULL, so the final template looked like "/tmp/(nuXXXXXX".
But glibc skips it because the same string doesn't fit in 3 chars
template in snprintf(..., "%s/%.3sXXXXXX",...).

Applied the patch. Thanks for review!