Pypy sandbox - writing to /tmp -

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i tring run python code in pypy sandbox. need output script doesn't interfere stdout.

i've read lot of sources , of them mentions, sanboxed script can write files virtual /tmp. not able achieve (all sources missing example).

if write access /tmp isn't possible, possible open pipe between sanboxed script , control script?

if none of possible, write binary data stdout? i'd tag begginning , ending of output in stdout, control script distinguish user output , output.

the virtual /tmp read-only; in fact attempt subprocess write file denied. if want change that, edit sources control outer process, far refuse attempt write. start do_ll_os__ll_os_open in rpython/translator/sandbox/sandlib.py.


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