OpenEuphoria

Making your own shared libraries

• Posted by Robert Craig <rds at ATTCANADA.NET> Jul 18, 1999
• 471 views

Here's an example of how you can write your
own C routines and add them to your Linux Euphoria
program. Making a shared library with gcc
isn't well documented, but is actually very simple.

1. Create a C source file, say, mylib.c
and define one or more C functions :

int sum(int x)
{
    int i, sum;

    sum = 0;
    for (i = 1; i <= x; i++)
        sum += i;
    return sum;
}


2. Create a Euphoria program, mylib.exu:

include dll.e

atom mylib
integer sum

mylib = open_dll("./mylib.so")

if mylib = NULL then
    puts(2, "Couldn't open mylib.so\n")
    abort(1)
end if

sum = define_c_func(mylib, "sum", {C_INT}, C_INT)

? c_func(sum, {10})   -- calls your C routine


3. Make a shared library from your C source file:

gcc -shared mylib.c -o mylib.so


4. Run your Euphoria program:

exu mylib

The output is: 55
- the sum of the integers from 1 to 10.


Regards,
     Rob Craig
     Rapid Deployment Software
     http://members.aol.com/FilesEu/