nodename.c

#include <stdio.h>

int
main (void)
{
        FILE *f;
        char name[255];

        if( !(f = popen("uname -n", "r")) ){
                perror("Can't execute cmd");
        }

        fgets(name, 255, f);

        printf("Node name: %s", name);

        return 0;
}