Background C program refuses to start

[DaveBarnett]

My issue is as follows:
I have written a background C application...tested it with an SSH terminal session (so I can easily view printf output)
'Works fine...  I build and download the entire project and add a watch window with some variables that the C prog has access to, so I can see the application is running.   I can now start the application from the task manager...and see the variables update, so I know the program has started.  I can also stop via the task manager...and the program stops.

But, I cannot seem to start the program from a plc or online command.

I've tried the example from the manual:

  system "/var/ftp/usrflash/Project/C\ Language/Background\ Programs/mycapp.out";

I've tried this, too:

  p1 = sprintf(256, "/var/ftp/usrflash/Project/C Language/Background Programs/mycapp.out" )
  system "%s", 256
 

Neither causes the program to start.  

Any ideas on what's going on?   ... or any debugging techniques that would be useful in this case ??

 

I’m using:
IDE ver: 4.5.2.9
firmware ver: 2.6.1.0 (CK3M)
 

Thanks in advance!

 

Edited March 1 by DaveBarnett
update

[Unit101]

This works for me...

        system "/var/ftp/usrflash/Project/C\ Language/Background\ Programs/compass25.out&";
 

[steve.milici]

This has been resolved. Both of the following work OK in a PLC:

 

system "/var/ftp/usrflash/Project/C\ Language/Background\ Programs/mycapp.out"

 

p1 = sprintf(256, "/var/ftp/usrflash/Project/C\ Language/Background\ Programs/mycapp.out")

system "%s", 256