Question

I have a watershed model executable in linux that when executed, reads from a number of input text files. When I find that executable via shell and execute it (without root), everything works fine. However, I’m writing a c++ program that needs to call the executable and so thought I’d simply use system(). When I do, the model executes but then returns an “end-of-file” runtime error associated with one of the primary input text files. I have no idea why the program would execute fine when I execute manually via shell but return an error when executed via the system() command.

I’m guessing that nobody will know what the problem is right away but I have no idea about where to start my investigation. I’d appreciate any suggestions.

Thanks!

My system command is:

system("/home/name/SWAT/olentangy/Scenarios/Default/TxtInOut/swat");

The error I receive is:

forrtl: severe (24): end-of-file during read, unit 23, file /home/name/EO_G/EIGHT/EIGHT/file.cio
Image              PC        Routine            Line        Source             
swat               0821D03F  Unknown               Unknown  Unknown
swat               0821BD35  Unknown               Unknown  Unknown
swat               081D78D1  Unknown               Unknown  Unknown
swat               081ABD66  Unknown               Unknown  Unknown
swat               081AB621  Unknown               Unknown  Unknown
swat               081BC9DF  Unknown               Unknown  Unknown

Answer 1

Even though swat is arguably buggy in its behavior, you can still work around it in your parent program:

Replace this:

system("/home/name/SWAT/olentangy/Scenarios/Default/TxtInOut/swat");

with this:

system("cd /home/name/SWAT/olentangy/Scenarios/Default/TxtInOut && ./swat");