[zeromq-dev] Setting privileges on a UNIX socket

Arnaud Loonstra arnaud at sphaero.org
Thu May 26 10:30:18 CEST 2016

I might be misinformed but some of my first thoughts

- what version of zeromq? Are you using zeromq's systemd support? I 
recall we were hacking on this in the hackathon during FOSDEM. Otherwise 
the socket fd might be unlinked which results in weird behaviour.
- Are you using chmod C method or the shell command? Usually you set 
permissions on the directory where the socket is created


On 2016-05-25 17:30, Ale Strooisma wrote:
> the previous update might be incorrect. Now it seems that I cant bind
> to a socket created by systemd (I got something like "address already
> in use"). If I connect to it instead with my server program, which
> uses a REP socket, it does receive messages, but cant seem to 
> reply...
> Anyway, all in all it would be highly preferable to be able to set
> with which permissions the socket is created. Currently I am working
> around this issue by calling chmod after binding to the socket.
> On 25 May 2016 at 14:50, Ale Strooisma 
> <a.strooisma at student.utwente.nl
> [2]> wrote:
>> Okay, a bit of an update: I tried ensuring the socket was available
>> using systemd, but when the program that binds to the port runs, it
>> resets the privileges.
>> On 25 May 2016 at 12:32, Ale Strooisma
>> <a.strooisma at student.utwente.nl [1]> wrote:
>>> Hi all,
>>> For my program, I am using the ipc protocol. The unix socket used
>>> needs to be accessible to various programs run by different users,
>>> so I want to set group write privileges. How can I do this? Can I
>>> set this using ZeroMQ from within the program that binds the
>>> socket, or do I need to make sure the socket is in place with the
>>> right privileges before running any of my programs? The latter
>>> option would be rather unpractical of course.
>>> Kind regards,
>>> Ale Strooisma
> Links:
> ------
> [1] mailto:a.strooisma at student.utwente.nl
> [2] mailto:a.strooisma at student.utwente.nl

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