Linux Dynamically Loaded Libraries and Global Variables

Millenniumman · 06-13-2007, 10:59 AM

I have two libraries that are very similar but function a little differently (text handling). One of them is dynamically linked to my application, and the other is dynamically loaded by it. If they both have a global variable named the same thing, should the variables function independently? i.e., if I set the variable in library2, will it affect the variable in library1?

jim mcnamara · 06-13-2007, 11:28 AM

global variables have file scope.

C99:

Quote:

If the declarator or type specifier that declares the identifier
appears outside of any block or list of parameters, the identifier has file scope, which terminates at the end of the translation unit.

dmail · 06-13-2007, 11:32 AM

I may be wrong here but I think it is restricted to the unit and therefore is not global to the whole application.

[edit] yep like jim said

Millenniumman · 06-13-2007, 11:37 AM

Thanks. Knowing that, is there any way to get gdb to show the current library? I know it shows it in the stack when the library has no symbols, but how do you get it to show it for libraries with symbols? Normally, they show source files instead, and I can't find a way to show the library.