getting a process return value from popen()?

[jschmitt at vmlabs.com]

If you do something like:

(instream,outstream) = popen4( "foo.exe" )

how do you get the return value from 'foo.exe' when it finally
terminates after reading everything from 'outstream'?  Say for
example, 'foo.exe' returns a non-zero integer to indicate an error
condition.

John


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