Marcus' suggestions are great. In the past, I have also used supervisord to
"daemonize" a flowgraph. If it ever dies, supervisord brings it right back
if that's what you want. It's like systemd for python, kinda.
On Wed, Jul 12, 2017 at 3:30 AM Marcus Müller <marcus.muel...@ettus.com>
wrote:
> Oh, by the way, maybe you, instead, simply would want to run your whole
> flowgraph using `nohup`, or simply in a `screen` or `tmux` session :)
>
> On 07/12/2017 09:22 AM, Marcus Müller wrote:
>
> If you can, update to the most current UHD – we've worked on the logging
> infrastructure, and you can simply disable that.
> This will probably require building both UHD, and as soon as you've done
> that, GNU Radio from source.
>
> Best regards,
> Marcus
>
> On 07/11/2017 10:39 PM, devin kelly wrote:
>
> Hello,
>
> I have a flowgraph that I made with GRC and modified. All I want to do
> with the flowgraph is make it run as a daemon. I understand that if there
> are overflows or underflows I'll miss them, that's OK.
>
> I added some basic python code to daemonize my flowgraph:
>
>
> # Fork once
> try:
> pid = os.fork()
> except OSError:
> print 'error forking'
>
> if pid > 0: # if parent, return
> return
>
> os.umask(0)
>
> # Reset the session ID
> try:
> os.setsid()
> except OSError:
> sys.exit(1)
>
> # Fork twice, giving up ownership of first parent's SID
> try:
> pid = os.fork()
> except OSError:
> print 'error forking'
>
> if pid != 0: # if parent, return
> sys.exit(0)
>
> # Change PWD
> try:
> os.chdir('/')
> except OSError:
> return
>
> # Close open files
> sys.stdin.close()
> sys.stdout.close()
> sys.stderr.close()
>
> with open('/dev/null', 'r+') as devnull:
> sys.stdin = devnull
> sys.stdout = devnull
> sys.stderr = devnull
>
> tb = top_block_cls(options)
> tb.start()
> time.sleep(60.0)
> tb.stop()
> tb.wait()
>
> When I run this, it works at first (I get my prompt back, you can see me
> trying to open the file). But then the UHD hijacks my stdout/stderr and
> resumes as if nothing happened.
>
> $ ./flowgraph.py -t
> 30
>
> linux; GNU C++ version 4.8.4; Boost_105500; UHD_003.009.005-0-g32951af2
>
> $ vim flowgraph.py -- X300 initialization
> sequence...
> -- Determining maximum frame size... 1472 bytes.
> -- Setup basic communication...
> -- Loading values from EEPROM...
> -- Setup RF frontend clocking...
> -- Radio 1x clock:200
> -- Initialize Radio0 control...
> -- Performing register loopback test... pass
> -- Initialize Radio1 control...
> -- Performing register loopback test... pass
>
> How do I stop the UHD from doing this?
>
> Thanks for any help,
> Devin
>
>
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--
Very Respectfully,
Dan CaJacob
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