WIP(ptrace): Better support for signals

Signals now cause an event, and there's a way to continue until the
next signal. I can see this being used for detection of `int3`
although I'm not entirely sure as it may prove being too late to stop
abortion of process.

src/data.rs

@@ -305,21 +305,22 @@ impl DerefMut for FloatRegisters {
 
 #[derive(Clone, Copy)]
 #[repr(C)]
-pub union PtraceEventContent {
+pub union PtraceEventData {
     pub clone: usize,
+    pub signal: usize
 }
 
-impl Default for PtraceEventContent {
+impl Default for PtraceEventData {
     fn default() -> Self {
         Self {
-            clone: 0
+            clone: 0,
         }
     }
 }
 
-impl fmt::Debug for PtraceEventContent {
+impl fmt::Debug for PtraceEventData {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "PtraceEventContent(...)")
+        write!(f, "PtraceEventData(...)")
     }
 }
 
@@ -327,7 +328,7 @@ impl fmt::Debug for PtraceEventContent {
 #[repr(C)]
 pub struct PtraceEvent {
     pub tag: u16,
-    pub data: PtraceEventContent,
+    pub data: PtraceEventData,
 }
 
 impl Deref for PtraceEvent {

src/flag.rs

@@ -69,10 +69,13 @@ pub const PTRACE_CONT: u8 = 0b0000_0001;
 pub const PTRACE_SINGLESTEP: u8 = 0b0000_0010;
 pub const PTRACE_SYSCALL: u8 = 0b0000_0011;
 pub const PTRACE_WAIT: u8 = 0b0000_0100;
+pub const PTRACE_SIGNAL: u8 = 0b0000_0101;
+
 pub const PTRACE_OPERATIONMASK: u8 = 0b0000_1111;
 pub const PTRACE_SYSEMU: u8 = 0b0001_0000;
 
 pub const PTRACE_EVENT_CLONE: u16 = 0;
+pub const PTRACE_EVENT_SIGNAL: u16 = 1;
 
 pub const SEEK_SET: usize = 0;
 pub const SEEK_CUR: usize = 1;