feat(cgo): add byte-slice support to Call arguments

Co-Authored-By: Virgil <virgil@lethean.io>

call_test.go

@@ -177,6 +177,15 @@ func TestCallSupportsCUintptrArgument(t *testing.T) {
 	}
 }
 
+func TestCallSupportsByteSliceArgument(t *testing.T) {
+	t.Parallel()
+
+	payload := []byte("agent")
+	if err := Call(callSumLengthFunction(), payload, SizeT(len(payload))); err != nil {
+		t.Fatalf("expected success, got %v", err)
+	}
+}
+
 func TestErrnoMapping(t *testing.T) {
 	t.Parallel()
 

string_conversion.go

@@ -819,6 +819,11 @@ func toSyscallArg(value interface{}) (uintptr, bool) {
 			return 0, true
 		}
 		return 0, false
+	case []byte:
+		if len(typed) == 0 {
+			return 0, true
+		}
+		return uintptr(unsafe.Pointer(&typed[0])), true
 	}
 }