calling c++ function from script

Lebamb · #1 (**permalink**) 06-18-2003

hi,

I just started to work on unix,

I was wondering if it is possible to call a c++ function from a script.
now, i don't mean starting a program, i mean dynamicaly calling a funtion (like working with a dll)

thanks

Perderabo · #2 (**permalink**) 06-18-2003

Not in general. A few shells like ksh have some features that allow them to extended in this manner. And ksh will dynamically load a shared library if needed. But you can't use just any c++ function. It must be specially written to know how it will be called, what it must return, and what global variables it can use.

google · #3 (**permalink**) 06-24-2003

Quote:

Originally posted by Perderabo
A few shells like ksh have some features that allow them to extended in this manner. And ksh will dynamically load a shared library if needed.

Perderabo, Could you elaborate on this? and possibly point me in the direction of a good book with the details? This sounds interesting..

Perderabo · #4 (**permalink**) 06-24-2003

Information is limited to say the least. I don't know of any book that covers it. And that doesn't surprise me. The details could change with the next release of ksh. There is a Faq on the Kornshell which says:

Quote:

Q4. How do I add built-in commands?
A4. There are two ways to do this. One is write a shared library
with functions whose names are b_xxxx where xxxx is the name of
the builtin. The function b_xxxx takes three argument. The first
two are the same as a mail program. The third parameter is
a pointer argument which will point to the current shell context.
The second way is to write a shared library with a function named
lib_init(). This function will be called with an argument of 0
after the library is loaded. This function can add built-ins
with the sh_addbuiltin() API function. In both cases, the
library is loaded into the shell with the "builtin" utility.

(I'm sure there's a typo in that quote, "mail program" should be "main program".) This is about all that I feel I quote here. In this article, there is an example. But the documentation with the source code had some differences. You really need to download the source code and read the docs that come with it. The file to look at is "builtins.mm" and you can read it with:
nroff -mm < builtins.mm | col -b | more

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