[compiler-rt] [compiler-rt][rtsan] stat api interception. (PR #128430)

[David CARLIER via llvm-commits]

devnexen wrote:

> Just double checking: Did you run these tests on mac? I only ask because I remember trying to implement these earlier last year and I had some problems on mac. The details are fuzzy now though...
> 
> LGTM if tests are happy on mac :)

I tested on mac and only this unrelated test fails:

```shell
Input file: <stdin>
Check file: /Users/dcarlier/Contribs/llvm-project/compiler-rt/test/rtsan/fork_exec.cpp

-dump-input=help explains the following input dump.

Input was:
<<<<<<
            1: ==73392==ERROR: RealtimeSanitizer: unsafe-library-call 
            2: Intercepted call to real-time unsafe function `fork` in real-time context! 
check:48'0                                                                               X error: no match found
            3:  #0 0x0001029cfc28 in fork rtsan_interceptors_posix.cpp:1366 
check:48'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            4:  #1 0x000102587d70 in main+0x24 (fork_exec.cpp.tmp:arm64+0x100003d70) 
check:48'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            5:  #2 0x0001937e4270 (<unknown module>) 
check:48'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            6:  
check:48'0     ~
            7: SUMMARY: RealtimeSanitizer: unsafe-library-call (fork_exec.cpp.tmp:arm64+0x100003d70) in main+0x24 
check:48'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            8: ==73392==ERROR: RealtimeSanitizer: unsafe-library-call 
check:48'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            9: Intercepted call to real-time unsafe function `pthread_mutex_lock` in real-time context! 
check:48'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
check:48'1     ?                                                                                         possible intended match
           10:  #0 0x0001029ceb6c in pthread_mutex_lock rtsan_interceptors_posix.cpp:750 
check:48'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           11:  #1 0x000193b639ec in _pthread_atfork_prepare_handlers+0x58 (libsystem_pthread.dylib:arm64+0x69ec) 
check:48'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           12:  #2 0x0001a172d498 in libSystem_atfork_prepare+0x1c (libSystem.B.dylib:arm64+0x1498) 
check:48'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           13:  #3 0x000193a1b404 in fork+0x20 (libsystem_c.dylib:arm64+0x24404) 
check:48'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           14:  #4 0x000102587d70 in main+0x24 (fork_exec.cpp.tmp:arm64+0x100003d70) 
check:48'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            .
            .
            .
>>>>>>

--

```

https://github.com/llvm/llvm-project/pull/128430