How to access a static variable from another file in C?

c static-variables
aks picture aks · Feb 9, 2010 · Viewed 11.9k times · Source

Possible Duplicate:
Static variable

How to access a static variable from another file in C? As a Static variable has a file scope, I think there is no way we can access it outside a file. But still I feel there might be some trick or way to do the same.

Answer

bramp picture bramp · Feb 9, 2010

I don't think there is a easy way. If you can change the file with the static variable you can do something like:

static int hiddenVar; // The static var you want to get at

// A new function you write
int * getHiddenVar() {
   return &hiddenVar;
}

But of course if you can change the file, you would just drop the static keyword.

Also, I doubt this helps, but I've had to do something like this when writing a kernel module in FreeBSD. I used a trick where I called the kernel's linker functions to find the address of a static function. I doubt you can do this in a normal C program though.

Related questions

Access a global static variable from another file in C

In C language, I want to access a global static variable outside the scope of the file. Let me know the best possible way to do it. One of the methods is to assign an extern global variable the value …

Read More
Access of static variable from one file to another file

I recently came across the question like how to access a variable which declared static in file1.c to another file2.c? Is it possible to access static variable? My understanding about static keyword in C is, static is "internal …

Read More
Can I free() static and automatic variables in C?

The code is as follow : #include <stdlib.h> int num = 3; // Static external variable int *ptr = &num; int main(void) { int num2 = 4; // Automatic variable int *ptr2 = &num2; free(ptr); //Free static variable free(ptr2); //Free automatic variable …

Read More