make a shell

Hi there,
I am writing a C++ program in Linux doing some enigineering stuff.  I want to make a shell in the program such that it can plot the graph by gnuplot automatically (or transform to eps format and display in ghostview) without exiting the program.

spawnl available in TC++ etc cannot be used in Linux, what can I use instead.  BTW, I dont want to quit the program striaght ahead. So execl is not a option...
oldjstAsked:
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JYoungmanConnect With a Mentor Commented:
You can use popen("gnuplot", "w").   [man popen]

Write to it, "set output your-temp-file" and "set terminal postscript" to start with.  

When you're done, send the temporary file to the print spooler.

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