On Fri, 29 Aug 2025 09:00:57 GMT, Stefan Karlsson <stef...@openjdk.org> wrote:
>> test/jdk/java/lang/ProcessBuilder/FDLeakTest/libFDLeaker.c line 54:
>>
>>> 52: if (ret != 0) {
>>> 53: return JNI_ERR;
>>> 54: }
>>
>> Hmm, if the JVM already has opened > 100 fds at this point, we get difficult
>> to understand errors. Any future open etc call will fail.
>>
>> What I would do is to check, after the call to fopen() at line 39, check for
>> errno==EMFILE. If that is true, write out a clear error message along the
>> lines of "more than 100 files open?" (since that in itself would be worth to
>> investigate; this little test should not open > 100 files, but who knows).
>
> OK. I've added error logging for both setting the limit and opening the file.
> I didn't check specifically for EMFILE, but I hope that's fine?
I also verified that if I set the limit to 3 I do get the "Too many open files"
error message.
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PR Review Comment: https://git.openjdk.org/jdk/pull/26979#discussion_r2309608800
