test how system stack is growing

stackgrow.c

#include <stdio.h>
#include <sys/utsname.h>

inline static void
u() {
        struct utsname uts;

        uname(&uts);

        printf("%s %s %s %s %s", uts.sysname, uts.nodename, uts.release, uts.version, uts.machine);


}

void
test_stack_growing(int *first) {
        int second;
        int third;

        printf("first %p, second %p, third %p\n\n", first, &second, &third);

        printf("stack is growing %s sbz on ", (&second > first) ? "up" : "down");
        u();
        puts("\n");
}

int
main(void) {
        int first;
        test_stack_growing(&first);
}