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Date: Fri, 13 Dec 2019 10:41:26 +0100
From: Ulli Horlacher <framstag AT rus DOT uni-stuttgart DOT de>
To: cygwin AT cygwin DOT com
Subject: Re: non-persistant storage?
Message-ID: <20191213094126.GF12864@tik.uni-stuttgart.de>
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References: <20191212120041 DOT GA7699 AT tik DOT uni-stuttgart DOT de> <8905c7b6-b2e6-52bf-bcdd-66890db91e9e AT cs DOT umass DOT edu> <20191212212746 DOT GA12864 AT tik DOT uni-stuttgart DOT de> <d6cd4cb8-cb75-a86d-46ac-c70f8bc73a5f AT cs DOT umass DOT edu> <5DF2E42A DOT 7020200 AT tlinx DOT org>
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On Thu 2019-12-12 (17:06), L A Walsh wrote:

> On 2019/12/12 13:40, Eliot Moss wrote:
> 
> > Ah!  I think what you want is a tmpfs or ramfs.
> > Not sure if cygwin supports that ...
> >   
> ----
>     Easiest thing might be to use /dev/shm. I used it during
> development to store intermediate data that was later to be
> transfered via a fifo...
> 
> Basically check for existence of "/dev/shm" (exists on my cygwin).
> if "tmp" didn't already exist, create it w/options similar to
> /tmp (only owner can delete/edit):
> 
> mkdir -m 1777 /tmp/shm/tmp
> 
> 
> **Warning, "writes" to /dev/shm/tmp (or /dev/mem) can fill up
> your system's memory, so its only good for "small files"
> (small being well under your system's free memory amount).

This is true for Linux, but not for cygwin, where /dev/shm is ntfs on disk: 

~: uname -a
CYGWIN_NT-10.0 VD-TIK-12 3.0.7(0.338/5/3) 2019-04-30 18:08 x86_64 Cygwin
~: df -TH /dev/shm

Filesystem     Type  Size  Used Avail Use% Mounted on
C:/cygwin64    ntfs   34G   25G  8.9G  74% /

Its content is still there after a reboot and I can see it with the windows
explorer:

https://fex.belwue.de/fop/dyQzlG1x/X-20191213103905.png


-- 
Ullrich Horlacher              Server und Virtualisierung
Rechenzentrum TIK         
Universitaet Stuttgart         E-Mail: horlacher AT tik DOT uni-stuttgart DOT de
Allmandring 30a                Tel:    ++49-711-68565868
70569 Stuttgart (Germany)      WWW:    http://www.tik.uni-stuttgart.de/
REF:<5DF2E42A DOT 7020200 AT tlinx DOT org>

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