New submission from marche147 <bitmar...@gmail.com>:
Consider the following code:
```
import resource
s, h = resource.getrlimit(resource.RLIMIT_STACK)
resource.setrlimit(resource.RLIMIT_STACK, (h, h))
```
Running this under macOS with python 3.6.5 gives the following exception:
```
bash-3.2$ uname -a
Darwin arch-osx 17.7.0 Darwin Kernel Version 17.7.0: Thu Jun 21 22:53:14 PDT
2018; root:xnu-4570.71.2~1/RELEASE_X86_64 x86_64
bash-3.2$ cat test.py
import resource
s, h = resource.getrlimit(resource.RLIMIT_STACK)
resource.setrlimit(resource.RLIMIT_STACK, (h, h))
bash-3.2$ python3 test.py
Traceback (most recent call last):
File "test.py", line 3, in <module>
resource.setrlimit(resource.RLIMIT_STACK, (h, h))
ValueError: current limit exceeds maximum limit
```
Nevertheless, when using python 2.7.10 under the same environment, this code
works perfectly without exceptions being thrown. Additionally, neither of these
operations fail under the same circumstances :
```
bash-3.2$ cat test.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/resource.h>
int main() {
struct rlimit rl;
if(getrlimit(RLIMIT_STACK, &rl) < 0) {
perror("getrlimit");
exit(1);
}
rl.rlim_cur = rl.rlim_max;
if(setrlimit(RLIMIT_STACK, &rl) < 0) {
perror("setrlimit");
exit(1);
}
return 0;
}
bash-3.2$ gcc -o test test.c
bash-3.2$ ./test
```
```
bash-3.2$ ulimit -s -H
65532
bash-3.2$ ulimit -s
8192
bash-3.2$ ulimit -s 65532
bash-3.2$ ulimit -s
65532
```
I have also tried to run the above-mentioned python script on linux, also it
does not generate exceptions both on python2 (2.7.10) & python3 (3.6.5).
----------
components: Library (Lib)
messages: 324731
nosy: marche147
priority: normal
severity: normal
status: open
title: python3 resource.setrlimit strange behaviour under macOS
type: behavior
versions: Python 3.6
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34602>
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