add EEXIST to errno.h

kernel/include/errno.h

@@ -13,23 +13,24 @@
 // TODO: Add correct errno.h numbers
 enum {
 	SUCCESS = 0,
-	ENOMEM,		// Cannot allocate memory
-	EPERM,		// Operation not permitted
-	ENOENT,		// No entry (no such file or directory)
-	EIO,		// Input/Output error
-	ENXIO,		// No such device or address
-	EAGAIN,		// Resource temporarly busy
-	EACCES,		// Permission denied
-	EFAULT,		// Bad address
-	ENODEV,		// No such device
-	EINVAL,		// Invalid argument
-	EDOM,		// Numerical argument out of domain
-	ERANGE,		// Numerical result out of range
-	ENOSYS,		// Function not implemented
-	ENOTSUP,	// Not supported
-	EILLSEQ,	// Illegal byte sequence
-	EOVERFLOW,	// 
-	EALIGN,		// Not aligned
+	ENOMEM,	   // Cannot allocate memory
+	EPERM,	   // Operation not permitted
+	ENOENT,	   // No entry (no such file or directory)
+	EIO,	   // Input/Output error
+	ENXIO,	   // No such device or address
+	EAGAIN,	   // Resource temporarly busy
+	EACCES,	   // Permission denied
+	EFAULT,	   // Bad address
+	ENODEV,	   // No such device
+	EINVAL,	   // Invalid argument
+	EDOM,	   // Numerical argument out of domain
+	ERANGE,	   // Numerical result out of range
+	ENOSYS,	   // Function not implemented
+	ENOTSUP,   // Not supported
+	EILLSEQ,   // Illegal byte sequence
+	EOVERFLOW, //
+	EALIGN,	   // Not aligned
+	EEXIST,	   // already exists
 };
 
 #endif