[zeromq-dev] Setting privileges on a UNIX socket

Ale Strooisma a.strooisma at student.utwente.nl
Thu May 26 12:30:35 CEST 2016

Sorry, I am not familiar with umask. As far as I understand, setting the
umask determines what permissions new files created by the user have.
However, in this case I need to specifically affect the files created by
this specific program. Do you mean there is a way to run a program that
determines what permissions a file created by it gets?

On 26 May 2016 at 11:01, Arnaud Loonstra <arnaud at sphaero.org> wrote:

> I don't think zmq deals with permissions? The OS does. Shouldn't you be
> using a umask?
> What's your umask set at?
> Rg,
> Arnaud
> On 2016-05-26 10:49, Ale Strooisma wrote:
>> I am using libzmq 4.0.5 - the one provided by EPEL for CentOS 7. I
>> have never noticed any systemd support in zeromq.
>> Yes I am using the chmod function from sys/stat.h with which I change
>> the permissions on the socket file from 0755 to 0770. The socket is
>> created in the tmp directory which has 1777.
>> Just to make it clear: Id prefer not having to mess around with
>> sockets outside ZeroMQ / my program.
>> On 26 May 2016 at 10:30, Arnaud Loonstra <arnaud at sphaero.org [7]>
>> wrote:
>> I might be misinformed but some of my first thoughts
>>> - what version of zeromq? Are you using zeromqs 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
>>> Rg,
>>> Arnaud
>>> 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.
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