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From:	"Lavrentiev, Anton (NIH/NLM/NCBI) [C] via cygwin" <cygwin AT cygwin DOT com>
Reply-To:	"Lavrentiev, Anton (NIH/NLM/NCBI) [C]" <lavr AT ncbi DOT nlm DOT nih DOT gov>
To:	"'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject:	Process limit in CYGWIN?
Date:	Tue, 3 Dec 2019 20:49:18 +0000
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Hi all,

I have some test code that forks number of processes, and it looks like under Cygwin it fails at fork number 255 (plus minus one).

There is no getrlimit()'s RLIMIT_NPROC on Cygwin (unlike Unices) yet I see that my shell somehow shows the process limit of 256:
$ ulimit -u
256

I tried to look it up, but nothing useful comes up, so decided to ask the list -- it can be a lot quicker...

1. Is there a limit, indeed?
2. If there is, is it a documented feature?
3. Can it be found out programmatically?  (IDK how bash does it, since like I mentioned, RLIMIT_NPROC is nonexistent,
and even with bash, changing the "-u" limit produces EINVAL, and Cygwin source code confirms that, too.)
4. Can the limit be changed (dynamically or compile time)?

Thanks,
Anton


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