Re: [patch] document that O_TMPFILE works with shm_open

[Daniel Colascione <dancol-CpwT7fMy01Ydnm+yROfE0A@public.gmane.org>]

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On 10/27/2015 03:12 PM, Florian Weimer wrote:
> * Daniel Colascione:
>
>> This test program works fine. (Watch it work in strace.) This patch is
>> against git master. It's okay to document accidental features, right?
>>
>> int
>> main()
>> {
>>     int shmfd = shm_open(".", O_TMPFILE | O_RDWR | O_EXCL, 0600);
>>     ftruncate(shmfd, 1000);
>>     mmap(NULL, 1000, PROT_READ | PROT_WRITE, MAP_SHARED, shmfd, 0);
>>
>>     return 0;
>> }
>
> This looks more like a bug to me.  I wouldn't count on it continuing
> to work.  glibc already tightened the rules for the name once.

I don't think they can break compatibility like that, and besides: it's
a useful feature, not a bug. Is it better for people to blindly open
files in /dev/shm? Because that's what they do today.


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