How to get the absolute path for a given relative path programmatically in Linux?

Question

How to get the absolute path for a given relative path programmatically in Linux?

Incase of Windows we have the _fullpath() API. In other words, I mean

Answer 1

Check out the realpath function.

#include  
#include  
#include 
int main() 
{ 
        char resolved_path[PATH_MAX]; 
        realpath("../../", resolved_path); 
        printf("\n%s\n",resolved_path); 
        return 0; 
}