shared global variables in C

Question

How can I create global variables that are shared in C? If I put it in a header file, then the linker complains that the variables are already defined. Is the only way to de

Answer 1

You put the declaration in a header file, e.g.

 extern int my_global;

In one of your .c files you define it at global scope.

int my_global;

Every .c file that wants access to my_global includes the header file with the extern in.