Add PtraceEvent for catching tracee forks

src/data.rs

 use core::ops::{Deref, DerefMut};
-use core::{mem, slice};
+use core::{fmt, mem, slice};
 
 #[derive(Copy, Clone, Debug, Default)]
 #[repr(C)]
@@ -13,7 +13,7 @@ impl Deref for Event {
     type Target = [u8];
     fn deref(&self) -> &[u8] {
         unsafe {
-            slice::from_raw_parts(self as *const Event as *const u8, mem::size_of::<Event>()) as &[u8]
+            slice::from_raw_parts(self as *const Event as *const u8, mem::size_of::<Event>())
         }
     }
 }
@@ -21,7 +21,7 @@ impl Deref for Event {
 impl DerefMut for Event {
     fn deref_mut(&mut self) -> &mut [u8] {
         unsafe {
-            slice::from_raw_parts_mut(self as *mut Event as *mut u8, mem::size_of::<Event>()) as &mut [u8]
+            slice::from_raw_parts_mut(self as *mut Event as *mut u8, mem::size_of::<Event>())
         }
     }
 }
@@ -38,7 +38,7 @@ impl Deref for ITimerSpec {
     fn deref(&self) -> &[u8] {
         unsafe {
             slice::from_raw_parts(self as *const ITimerSpec as *const u8,
-                                  mem::size_of::<ITimerSpec>()) as &[u8]
+                                  mem::size_of::<ITimerSpec>())
         }
     }
 }
@@ -47,7 +47,7 @@ impl DerefMut for ITimerSpec {
     fn deref_mut(&mut self) -> &mut [u8] {
         unsafe {
             slice::from_raw_parts_mut(self as *mut ITimerSpec as *mut u8,
-                                      mem::size_of::<ITimerSpec>()) as &mut [u8]
+                                      mem::size_of::<ITimerSpec>())
         }
     }
 }
@@ -64,7 +64,7 @@ impl Deref for Map {
     type Target = [u8];
     fn deref(&self) -> &[u8] {
         unsafe {
-            slice::from_raw_parts(self as *const Map as *const u8, mem::size_of::<Map>()) as &[u8]
+            slice::from_raw_parts(self as *const Map as *const u8, mem::size_of::<Map>())
         }
     }
 }
@@ -72,7 +72,7 @@ impl Deref for Map {
 impl DerefMut for Map {
     fn deref_mut(&mut self) -> &mut [u8] {
         unsafe {
-            slice::from_raw_parts_mut(self as *mut Map as *mut u8, mem::size_of::<Map>()) as &mut [u8]
+            slice::from_raw_parts_mut(self as *mut Map as *mut u8, mem::size_of::<Map>())
         }
     }
 }
@@ -94,7 +94,7 @@ impl Deref for Packet {
     type Target = [u8];
     fn deref(&self) -> &[u8] {
         unsafe {
-            slice::from_raw_parts(self as *const Packet as *const u8, mem::size_of::<Packet>()) as &[u8]
+            slice::from_raw_parts(self as *const Packet as *const u8, mem::size_of::<Packet>())
         }
     }
 }
@@ -102,7 +102,7 @@ impl Deref for Packet {
 impl DerefMut for Packet {
     fn deref_mut(&mut self) -> &mut [u8] {
         unsafe {
-            slice::from_raw_parts_mut(self as *mut Packet as *mut u8, mem::size_of::<Packet>()) as &mut [u8]
+            slice::from_raw_parts_mut(self as *mut Packet as *mut u8, mem::size_of::<Packet>())
         }
     }
 }
@@ -150,7 +150,7 @@ impl Deref for Stat {
     fn deref(&self) -> &[u8] {
         unsafe {
             slice::from_raw_parts(self as *const Stat as *const u8,
-                                  mem::size_of::<Stat>()) as &[u8]
+                                  mem::size_of::<Stat>())
         }
     }
 }
@@ -159,7 +159,7 @@ impl DerefMut for Stat {
     fn deref_mut(&mut self) -> &mut [u8] {
         unsafe {
             slice::from_raw_parts_mut(self as *mut Stat as *mut u8,
-                                      mem::size_of::<Stat>()) as &mut [u8]
+                                      mem::size_of::<Stat>())
         }
     }
 }
@@ -178,7 +178,7 @@ impl Deref for StatVfs {
     fn deref(&self) -> &[u8] {
         unsafe {
             slice::from_raw_parts(self as *const StatVfs as *const u8,
-                                  mem::size_of::<StatVfs>()) as &[u8]
+                                  mem::size_of::<StatVfs>())
         }
     }
 }
@@ -187,7 +187,7 @@ impl DerefMut for StatVfs {
     fn deref_mut(&mut self) -> &mut [u8] {
         unsafe {
             slice::from_raw_parts_mut(self as *mut StatVfs as *mut u8,
-                                      mem::size_of::<StatVfs>()) as &mut [u8]
+                                      mem::size_of::<StatVfs>())
         }
     }
 }
@@ -204,7 +204,7 @@ impl Deref for TimeSpec {
     fn deref(&self) -> &[u8] {
         unsafe {
             slice::from_raw_parts(self as *const TimeSpec as *const u8,
-                                  mem::size_of::<TimeSpec>()) as &[u8]
+                                  mem::size_of::<TimeSpec>())
         }
     }
 }
@@ -213,7 +213,7 @@ impl DerefMut for TimeSpec {
     fn deref_mut(&mut self) -> &mut [u8] {
         unsafe {
             slice::from_raw_parts_mut(self as *mut TimeSpec as *mut u8,
-                                      mem::size_of::<TimeSpec>()) as &mut [u8]
+                                      mem::size_of::<TimeSpec>())
         }
     }
 }
@@ -257,7 +257,7 @@ impl Deref for IntRegisters {
     type Target = [u8];
     fn deref(&self) -> &[u8] {
         unsafe {
-            slice::from_raw_parts(self as *const IntRegisters as *const u8, mem::size_of::<IntRegisters>()) as &[u8]
+            slice::from_raw_parts(self as *const IntRegisters as *const u8, mem::size_of::<IntRegisters>())
         }
     }
 }
@@ -265,7 +265,7 @@ impl Deref for IntRegisters {
 impl DerefMut for IntRegisters {
     fn deref_mut(&mut self) -> &mut [u8] {
         unsafe {
-            slice::from_raw_parts_mut(self as *mut IntRegisters as *mut u8, mem::size_of::<IntRegisters>()) as &mut [u8]
+            slice::from_raw_parts_mut(self as *mut IntRegisters as *mut u8, mem::size_of::<IntRegisters>())
         }
     }
 }
@@ -291,7 +291,7 @@ impl Deref for FloatRegisters {
     type Target = [u8];
     fn deref(&self) -> &[u8] {
         unsafe {
-            slice::from_raw_parts(self as *const FloatRegisters as *const u8, mem::size_of::<FloatRegisters>()) as &[u8]
+            slice::from_raw_parts(self as *const FloatRegisters as *const u8, mem::size_of::<FloatRegisters>())
         }
     }
 }
@@ -299,7 +299,51 @@ impl Deref for FloatRegisters {
 impl DerefMut for FloatRegisters {
     fn deref_mut(&mut self) -> &mut [u8] {
         unsafe {
-            slice::from_raw_parts_mut(self as *mut FloatRegisters as *mut u8, mem::size_of::<FloatRegisters>()) as &mut [u8]
+            slice::from_raw_parts_mut(self as *mut FloatRegisters as *mut u8, mem::size_of::<FloatRegisters>())
+        }
+    }
+}
+
+#[derive(Clone, Copy)]
+#[repr(C)]
+pub union PtraceEventContent {
+    pub clone: usize,
+}
+
+impl Default for PtraceEventContent {
+    fn default() -> Self {
+        Self {
+            clone: 0
+        }
+    }
+}
+
+impl fmt::Debug for PtraceEventContent {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "PtraceEventContent(...)")
+    }
+}
+
+#[derive(Clone, Copy, Debug, Default)]
+#[repr(C)]
+pub struct PtraceEvent {
+    pub tag: u16,
+    pub data: PtraceEventContent,
+}
+
+impl Deref for PtraceEvent {
+    type Target = [u8];
+    fn deref(&self) -> &[u8] {
+        unsafe {
+            slice::from_raw_parts(self as *const PtraceEvent as *const u8, mem::size_of::<PtraceEvent>())
+        }
+    }
+}
+
+impl DerefMut for PtraceEvent {
+    fn deref_mut(&mut self) -> &mut [u8] {
+        unsafe {
+            slice::from_raw_parts_mut(self as *mut PtraceEvent as *mut u8, mem::size_of::<PtraceEvent>())
         }
     }
 }

src/flag.rs

@@ -72,6 +72,8 @@ pub const PTRACE_WAIT: u8 = 0b0000_0100;
 pub const PTRACE_OPERATIONMASK: u8 = 0b0000_1111;
 pub const PTRACE_SYSEMU: u8 = 0b0001_0000;
 
+pub const PTRACE_EVENT_CLONE: u16 = 0;
+
 pub const SEEK_SET: usize = 0;
 pub const SEEK_CUR: usize = 1;
 pub const SEEK_END: usize = 2;