[systemd-devel] Query regarding NOTIFY_SOCKET

[Raghavendra. H. R]

Hi Tomasz,

Thanks for pointing out the mistake. I actually missed the line
"Type=notify" in the mail.
I found the journalctl logs and from that I can make out the real problem
is not about NOTIFY_SOCKET. It is about child process in my application
*Myapp.*

Below given is my Service file.

*[Unit]*
*Description=Sd_notify example*

*[Service]*
*Type=notify*
*ExecStart=/etc/Myapp*

*[Install]*
*WantedBy=multi-user.target*

And in Myapp code my application is using fork() to create a child process.
Because of which notification is not working correctly.

This is error log


*localhost systemd[1]: sd_example.service: Got notification message from
PID 1270, but reception only permitted for main PID 1106*

Is there any way from which we can force sd_notify to make use of Parent
PID instead of child process. My sd_notify is after the fork() call, so I
doubt sd_notify is called from child process.

MyApp code snippet

        *int count = 0;*
*        cpid = fork();*

*        if (cpid < 0)*
*        {*
*            printf("vfork failed.");*
*        }*

*        if (cpid == 0)*
*        {*
*            count++;*
*            if(count == 1)*
* {*
* ret = sd_notify(0, "READY=1");*
* printf("Return value = %d \n");*
* }*
* }*


Regards,
Raghavendra H R

--
Regards,

Raghavendra. H. R
(Raghu)

On Tue, Nov 8, 2016 at 5:15 PM, Tomasz Torcz <tomek at pipebreaker.pl> wrote:

> On Tue, Nov 08, 2016 at 05:01:59PM +0530, Raghavendra. H. R wrote:
> > Hi All,
> >
> > I'm a newbie in Systemd init system and I'm exploring sd_notify which is
> > basically used for notification purpose in SystemD.
>
>   It is written “systemd” (all lowercase).
>
> > I have created one unit file which is of type "notify" and in my
> > application I have written sd_notify(0, "READY=1"); from which SystemD
> can
> > be notified that my process in totally up and running.
> >
> > Below given is my Service file.
> >
> > *[Unit]*
> > *Description=Sd_notify example*
> >
> > *[Service]*
> > *ExecStart=/etc/Myapp*
>
>
>   This is not 'unit of type notify'. This is unit of type 'simple'.
> Please read "man systemd.service" and paragraph Type= and choose
> correctly.
>
>
> > Need help in understanding what value should be set in the environment
> > varaible NOTIFY_SOCKET.
> > But there's no much information/documentation available on NOTIFY_SOCKET.
>
>   NOTIFY_SOCKET is filled-in by systemd and it is available when you
> correctly defined unit type.  If you want to check it's value, you can
> user getenv() inside you program and print the value.
>   I think amount of documentation about NOTIFY_SOCKET is enough, if
> you think there's something specific missing, let us know.
>
>
> --
> Tomasz Torcz               "Never underestimate the bandwidth of a station
> xmpp: zdzichubg at chrome.pl    wagon filled with backup tapes." -- Jim Gray
>
> _______________________________________________
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> systemd-devel at lists.freedesktop.org
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>
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