Kernel/LibC: Add support for creating hardlinks

userspace/libraries/LibC/include/sys/syscall.h

@@ -90,6 +90,7 @@ __BEGIN_DECLS
 	O(SYS_PTSNAME,			ptsname)		\
 	O(SYS_FSYNC,			fsync)			\
 	O(SYS_SYMLINKAT,		symlinkat)		\
+	O(SYS_HARDLINKAT,		hardlinkat)		\
 
 enum Syscall
 {

userspace/libraries/LibC/unistd.cpp

@@ -630,3 +630,13 @@ int symlinkat(const char* path1, int fd, const char* path2)
 {
 	return syscall(SYS_SYMLINKAT, path1, fd, path2);
 }
+
+int link(const char* path1, const char* path2)
+{
+	return linkat(AT_FDCWD, path1, AT_FDCWD, path2, 0);
+}
+
+int linkat(int fd1, const char *path1, int fd2, const char *path2, int flag)
+{
+	return syscall(SYS_HARDLINKAT, fd1, path1, fd2, path2, flag);
+}