Re: [Qemu-devel] [PATCH v7 12/54] tests/tcg/multiarch: don't hard code paths/ports for linux-test

[Thomas Huth <thuth@redhat.com>]

On 18.06.2018 12:56, Alex Bennée wrote:
> 
> Thomas Huth <thuth@redhat.com> writes:
> 
>> On 15.06.2018 21:46, Alex Bennée wrote:
>>> The fixed path and ports get in the way of running our tests and
>>> builds in parallel. Instead of using TESTPATH we use mkdtemp() and
>>> instead of a fixed port we allow the kernel to assign one and query it
>>> afterwards.
>>>
>>> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
>>> ---
>>>  tests/tcg/multiarch/linux-test.c | 37 ++++++++++++++++----------------
>>>  1 file changed, 19 insertions(+), 18 deletions(-)
>>>
>>> diff --git a/tests/tcg/multiarch/linux-test.c b/tests/tcg/multiarch/linux-test.c
>>> index 6f2c531474..3f73b96420 100644
>>> --- a/tests/tcg/multiarch/linux-test.c
>>> +++ b/tests/tcg/multiarch/linux-test.c
>>> @@ -41,8 +41,6 @@
>>>  #include <setjmp.h>
>>>  #include <sys/shm.h>
>>>
>>> -#define TESTPATH "/tmp/linux-test.tmp"
>>> -#define TESTPORT 7654
>>>  #define STACK_SIZE 16384
>>>
>>>  static void error1(const char *filename, int line, const char *fmt, ...)
>>> @@ -85,19 +83,15 @@ static void test_file(void)
>>>      struct iovec vecs[2];
>>>      DIR *dir;
>>>      struct dirent *de;
>>> +    char template[] = "/tmp/linux-test-XXXXXX";
>>> +    char *tmpdir = mkdtemp(template);
>>>
>>> -    /* clean up, just in case */
>>> -    unlink(TESTPATH "/file1");
>>> -    unlink(TESTPATH "/file2");
>>> -    unlink(TESTPATH "/file3");
>>> -    rmdir(TESTPATH);
>>> +    chk_error(strlen(tmpdir));
>>
>> That line looks wrong to me. According to my man-page of mkdtemp(), it
>> returns either NULL or a pointer to the modified string.
>> In case of NULL, strlen(tmpdir) will simply crash. And even if it would
>> not crash, strlen() only returns values >= 0, so there is no way the
>> chk_error could ever report an error here.
> 
> As we only really want to check we did actually do a mkdtemp would:
> 
>   chk_error(tmpdir)

chk_error() checks for negative values, so I guess you rather should
assert(tmpdir) here instead.

 Thomas