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
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
