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Date: Fri, 8 Jul 2005 07:48:22 -0700 (PDT)
From: <jscottkasten@yahoo.com>
Subject: Re: function Name
To: raja <vnagaraju@effigent.net>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <42CE1945.7080909@effigent.net>
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--- raja <vnagaraju@effigent.net> wrote:

> hi,
>    I am writing a function that takes the return
> value of the another 
> function and gives the  status of the function.
> if
>    error("functionName",arguments)
> here the function with Name "functionName " is to be
> executed with the 
> corresponding argunents.But by knowing the function
> name how can i get 
> the address if that function and how can i execute
> the function with the 
> arguments.
> 

Dude, this is not the right forum for these types of
questions.  You need to look at some good general
texts.  I don't know if you can get a copy of Steven's
or other general Unix programming text, but that's
what would help you the most.  Anyway, here's an
example for you.  The C compiler in general treats a
function name as a type of pointer, similar to an
array base pointer in that you cannot modify it, but
you can de-reference it.

/* Crude demo program for calling a function
 * by indirect means and supplying arguments.
 *
 * Yes, it's GPL.  :-)
 */

#include <stdio.h>

int foo(char *message)
{
  int error = 0;

  if (message)
    printf("%s\n", message);
  else
    error = 1;

  return error;
}

int call_a_function(int (*func)(char *), char *arg)
{
  return (*func)(arg);
} 

int main(int argc, char *argv[])
{
  int (*func)(char *);
  char *arg;

  if (argc == 2) {
    func = foo;
    arg  = argv[1];
    return call_a_function(func, arg);
  } else {
    return 1;
  }
}