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#include <assert.h>
#include <unistd.h>
#include <sys/stat.h>
#define OLD "/sandbox/input.txt"
#define NEW "/tmp/output.txt"
int main() {
struct stat st_old;
struct stat st_new;
assert(0 == stat(OLD, &st_old));
assert(0 == link(OLD, NEW));
assert(0 == stat(NEW, &st_new));
assert(st_old.st_ino == st_new.st_ino);
return 0;
}