In good old days the Turbo Pascal had an EXEC procedure that could
execute another program by invoking the DOS command interpreter.
In better new days the FPC does not seem to have such an option, or I
couldn’t find it in the docs.
Now I am particularly interested in doing such a thing in a Linux system.
I have found in the unix unit a function FPEXECV(path, pp) that may be
used for it, but it leaves a few questions to me.
According to the docs the function does not return (if it succeeds). Is
there no way of calling another program and then continue the calling
program? Could it be done by starting a new thread, putting the call
into that thread and let that thread not return while the main program
continues? Will it leave allocated memory, that is never freed?
If the function does not return, why is there a return integer value
defined?
(Or: why is it called a function, when it does not return?)
In the doc’s example the FPEXECV(path, pp) has the same pchar in the
path and as the first pchar of the pchar array that pp points to. I have
tried similar examples, and they always seem to work with the same phar
in the two places, but not otherwise. Is there some deeper philosophy in
having the program-name in both path and in the first phar of the array?
Hans Maartensson
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