Don't memcpy the parent capability. Fix #144.

To give the platform developer more freedom in how the Native_capability
class is internally implemented (e.g. turning it into a smart-pointer),
this patch removes the memcpy operation, when transfering the parent-capability
to a new process from the generic code, and let the implementation of the
platform-specific Native_capability decide how the transfer has to be done.
Please refer to issue #144.

base-codezero/include/base/native_types.h

@@ -14,6 +14,8 @@
 #ifndef _INCLUDE__BASE__NATIVE_TYPES_H_
 #define _INCLUDE__BASE__NATIVE_TYPES_H_
 
+#include <util/string.h>
+
 namespace Codezero {
 
 	struct l4_mutex;
@@ -140,6 +142,12 @@ namespace Genode {
 			int dst() const { return _tid.tid; }
 
 			Native_thread_id tid() const { return _tid; }
+
+			/**
+			 * Copy this capability to another pd.
+			 */
+			void copy_to(void* dst) {
+				memcpy(dst, this, sizeof(Native_capability)); }
 	};
 
 	typedef int Native_connection_state;

base-fiasco/include/base/native_types.h

@@ -14,6 +14,8 @@
 #ifndef _INCLUDE__BASE__NATIVE_TYPES_H_
 #define _INCLUDE__BASE__NATIVE_TYPES_H_
 
+#include <util/string.h>
+
 namespace Fiasco {
 #include <l4/sys/types.h>
 
@@ -114,6 +116,12 @@ namespace Genode {
 			 * Access raw capability data
 			 */
 			Fiasco::l4_threadid_t tid() const { return _tid; }
+
+			/**
+			 * Copy this capability to another pd.
+			 */
+			void copy_to(void* dst) {
+				memcpy(dst, this, sizeof(Native_capability)); }
 	};
 
 	typedef Fiasco::l4_threadid_t Native_connection_state;

base-foc/include/base/native_types.h

@@ -1,6 +1,8 @@
 #ifndef _INCLUDE__BASE__NATIVE_TYPES_H_
 #define _INCLUDE__BASE__NATIVE_TYPES_H_
 
+#include <util/string.h>
+
 namespace Fiasco {
 #include <l4/sys/consts.h>
 #include <l4/sys/types.h>
@@ -84,6 +86,11 @@ namespace Genode {
 
 			bool valid() const { return _cap_sel.valid() && _unique_id != 0; }
 
+			/**
+			 * Copy this capability to another pd.
+			 */
+			void copy_to(void* dst) {
+				memcpy(dst, this, sizeof(Native_capability)); }
 	};
 
 	typedef int Native_connection_state;

base-host/include/base/native_types.h

@@ -14,6 +14,8 @@
 #ifndef _INCLUDE__BASE__NATIVE_TYPES_H_
 #define _INCLUDE__BASE__NATIVE_TYPES_H_
 
+#include <util/string.h>
+
 namespace Genode {
 
 	typedef volatile int  Native_lock;
@@ -42,6 +44,12 @@ namespace Genode {
 			void*            local()      const { return (void*)_local_name; }
 			int              dst()        const { return 0; }
 			Native_thread_id tid()        const { return 0; }
+
+			/**
+			 * Copy this capability to another pd.
+			 */
+			void copy_to(void* dst) {
+				memcpy(dst, this, sizeof(Native_capability)); }
 	};
 
 	typedef int Native_connection_state;

base-linux/include/base/native_types.h

@@ -14,6 +14,8 @@
 #ifndef _INCLUDE__BASE__NATIVE_TYPES_H_
 #define _INCLUDE__BASE__NATIVE_TYPES_H_
 
+#include <util/string.h>
+
 /*
  * We cannot just include <semaphore.h> and <pthread.h> here
  * because this would impy the nested inclusion of a myriad
@@ -145,6 +147,12 @@ namespace Genode {
 			 */
 			long dst() const { return _tid; }
 			long tid() const { return _tid; }
+
+			/**
+			 * Copy this capability to another pd.
+			 */
+			void copy_to(void* dst) {
+				memcpy(dst, this, sizeof(Native_capability)); }
 	};
 
 	typedef int Native_connection_state;  /* socket descriptor */

base-mb/include/base/native_types.h

@@ -14,6 +14,7 @@
 #ifndef _INCLUDE__BASE__NATIVE_TYPES_H_
 #define _INCLUDE__BASE__NATIVE_TYPES_H_
 
+#include <util/string.h>
 #include <kernel/types.h>
 
 namespace Genode {
@@ -56,6 +57,12 @@ namespace Genode {
 			int dst() const { return (int)_tid; }
 
 			Native_thread_id tid() const { return _tid; }
+
+			/**
+			 * Copy this capability to another pd.
+			 */
+			void copy_to(void* dst) {
+				memcpy(dst, this, sizeof(Native_capability)); }
 	};
 
 	typedef int Native_connection_state;

base-nova/include/base/native_types.h

@@ -14,6 +14,8 @@
 #ifndef _INCLUDE__BASE__NATIVE_TYPES_H_
 #define _INCLUDE__BASE__NATIVE_TYPES_H_
 
+#include <util/string.h>
+
 namespace Genode {
 
 	typedef volatile int  Native_lock;
@@ -85,6 +87,12 @@ namespace Genode {
 
 			int   unique_id()  const { return _unique_id; }
 			int   pt_sel()     const { return _pt_sel; }
+
+			/**
+			 * Copy this capability to another pd.
+			 */
+			void copy_to(void* dst) {
+				memcpy(dst, this, sizeof(Native_capability)); }
 	};
 
 	typedef int Native_connection_state;

base-okl4/include/base/native_types.h

@@ -14,6 +14,8 @@
 #ifndef _INCLUDE__BASE__NATIVE_TYPES_H_
 #define _INCLUDE__BASE__NATIVE_TYPES_H_
 
+#include <util/string.h>
+
 namespace Okl4 { extern "C" {
 #include <l4/types.h>
 } }
@@ -125,6 +127,12 @@ namespace Genode {
 			 * Access raw capability data
 			 */
 			Okl4::L4_ThreadId_t tid() const { return _tid; };
+
+			/**
+			 * Copy this capability to another pd.
+			 */
+			void copy_to(void* dst) {
+				memcpy(dst, this, sizeof(Native_capability)); }
 	};
 
 	typedef Okl4::L4_ThreadId_t Native_connection_state;

base-pistachio/include/base/native_types.h

@@ -14,6 +14,8 @@
 #ifndef _INCLUDE__BASE__NATIVE_TYPES_H_
 #define _INCLUDE__BASE__NATIVE_TYPES_H_
 
+#include <util/string.h>
+
 namespace Pistachio {
 #include <l4/types.h>
 }
@@ -109,6 +111,12 @@ namespace Genode {
 			 * Access raw capability data
 			 */
 			Pistachio::L4_ThreadId_t tid() const { return _tid; };
+
+			/**
+			 * Copy this capability to another pd.
+			 */
+			void copy_to(void* dst) {
+				memcpy(dst, this, sizeof(Native_capability)); }
 	};
 
 	typedef Pistachio::L4_ThreadId_t Native_connection_state;

base/src/base/process/process.cc

@@ -122,7 +122,7 @@ static addr_t _setup_elf(Parent_capability parent_cap,
 			 * data segment
 			 */
 			if (!parent_info) {
-				memcpy(ptr, &parent_cap, sizeof(parent_cap));
+				parent_cap.copy_to(ptr);
 				parent_info = true;
 			}