Bugfix on fcntl O_NONBLOCK value

wtfstopw.asm

@@ -6,17 +6,20 @@ global _start
 _start:
 
 ; set stdin non blocking
+xor rdx, rdx
 mov rax, 72 ; fcntl
 mov rdi, 0 ; stdin
 mov rsi, 3 ; F_GETFL
-mov rdx, 0
 syscall
 mov rdx, rax
-or rdx, 4 ; O_NONBLOCK
+or rdx, 0x800 ; O_NONBLOCK
+dbg:
 mov rax, 72 ; fcntl
 mov rdi, 0 ; stdin
 mov rsi, 4 ; F_SETFL
 syscall
+cmp rax, 0
+jne fault
 
 mov rax, 228 ; clock_gettime
 mov rdi, 0 ; CLOCK_REALTIME
@@ -207,7 +210,7 @@ hours: db "000000000"
 timestr: db ":00:00.0000    ", 0x0D
 timestrlen: equ $ - timestr
 
-nl: db 10
+nl: db 0x0A
 buf: db 0
 
 ts_cur: