Add way to ignore signals

src/flag.rs

@@ -128,7 +128,7 @@ bitflags! {
         const PTRACE_EVENT_CLONE = 0x0000_0000_0000_0100;
         const PTRACE_EVENT_MASK = 0x0000_0000_0000_0F00;
 
-        const PTRACE_FLAG_SYSEMU = 0x0000_0000_0000_1000;
+        const PTRACE_FLAG_IGNORE = 0x0000_0000_0000_1000;
         const PTRACE_FLAG_WAIT = 0x0000_0000_0000_2000;
         const PTRACE_FLAG_MASK = 0x0000_0000_0000_F000;
     }