kernel! giant source code refactor.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

10 files changed, 576 insertions, 604 deletions

diff --git a/src/libSystem/SystemKit/Err.h b/src/libSystem/SystemKit/Err.h
index 7e8dbee4..f7e471c6 100644
--- a/src/libSystem/SystemKit/Err.h
+++ b/src/libSystem/SystemKit/Err.h
@@ -1,8 +1,6 @@
-/* ========================================
-
-  Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
-
-======================================== */
+// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
+// Licensed under the Apache License, Version 2.0 (see LICENSE file)
+// Official repository: https://github.com/nekernel-org/nekernel
 
 #ifndef SYSTEMKIT_ERR_H
 #define SYSTEMKIT_ERR_H
diff --git a/src/libSystem/SystemKit/Jail.h b/src/libSystem/SystemKit/Jail.h
index acf392b4..0a5c0082 100644
--- a/src/libSystem/SystemKit/Jail.h
+++ b/src/libSystem/SystemKit/Jail.h
@@ -1,8 +1,6 @@
-/* ========================================
-
-  Copyright (C) 2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
-
-======================================== */
+// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
+// Licensed under the Apache License, Version 2.0 (see LICENSE file)
+// Official repository: https://github.com/nekernel-org/nekernel
 
 #ifndef SYSTEMKIT_JAIL_H
 #define SYSTEMKIT_JAIL_H
diff --git a/src/libSystem/SystemKit/Macros.h b/src/libSystem/SystemKit/Macros.h
index dab30384..cd337f26 100644
--- a/src/libSystem/SystemKit/Macros.h
+++ b/src/libSystem/SystemKit/Macros.h
@@ -1,11 +1,6 @@
-/* ========================================
-
-Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
-
-File: Macros.h
-Purpose: libsci Macros header.
-
-======================================== */
+// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
+// Licensed under the Apache License, Version 2.0 (see LICENSE file)
+// Official repository: https://github.com/nekernel-org/nekernel
 
 #ifndef SYSTEMKIT_MACROS_H
 #define SYSTEMKIT_MACROS_H
diff --git a/src/libSystem/SystemKit/Syscall.h b/src/libSystem/SystemKit/Syscall.h
index 1d30782f..18a33980 100644
--- a/src/libSystem/SystemKit/Syscall.h
+++ b/src/libSystem/SystemKit/Syscall.h
@@ -1,8 +1,6 @@
-/* ========================================
-
-  Copyright (C) 2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
-
-======================================== */
+// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
+// Licensed under the Apache License, Version 2.0 (see LICENSE file)
+// Official repository: https://github.com/nekernel-org/nekernel
 
 #ifndef SYSTEMKIT_SYSCALL_H
 #define SYSTEMKIT_SYSCALL_H
diff --git a/src/libSystem/SystemKit/System.h b/src/libSystem/SystemKit/System.h
index e4222910..4e3cc264 100644
--- a/src/libSystem/SystemKit/System.h
+++ b/src/libSystem/SystemKit/System.h
@@ -1,389 +1,384 @@
-/* ========================================

-

-Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.

-

-File: System.h

-Purpose: System Call Interface.

-

-======================================== */

-

-#ifndef LIBSYS_SYSTEM_CALLS_H

-#define LIBSYS_SYSTEM_CALLS_H

-

-#include <libSystem/SystemKit/Macros.h>

-

-/// @brief TTY device path.

-#define kPrintDevicePath "/devices/tty{}"

-#define kCDDevicePath "/devices/dvd{}"

-

-// ------------------------------------------------------------------------------------------ //

-/// @brief Types API.

-// ------------------------------------------------------------------------------------------ //

-

-struct REF_TYPE {

-  UInt64  __hash;  /// @brief Hash of the syscall

-  VoidPtr __self;  /// @brief Syscall self value.

-};

-

-typedef REF_TYPE* Ref;

-

-typedef Ref IORef;

-typedef Ref FSRef;

-typedef Ref DylibRef;

-typedef Ref ThreadRef;

-typedef Ref SocketRef;

-typedef Ref NetworkRef;

-typedef Ref MutexRef;

-typedef Ref EventRef;

-typedef Ref SemaphoreRef;

-

-// ------------------------------------------------------------------------------------------ //

-/// @brief Dynamic Loader API.

-// ------------------------------------------------------------------------------------------ //

-

-/// @brief Get function which is part of the Dylib.

-/// @param symbol the symbol to look for

-/// @param dll_handle the Dylib handle.

-/// @return the proc pointer.

-IMPORT_C Ref LdrGetDylibSymbolFromHandle(_Input const Char* symbol, _Input Ref dll_handle);

-

-/// @brief Open Dylib handle.

-/// @param path dll path.

-/// @param drv driver letter.

-/// @return a dylib ref.

-IMPORT_C Ref LdrOpenDylibHandle(_Input const Char* path, _Input const Char* drive_letter);

-

-/// @brief Close Dylib handle

-/// @param dll_handle the dylib ref.

-/// @return whether it closed or not.

-IMPORT_C UInt32 LdrCloseDylibHandle(_Input Ref* dll_handle);

-

-// ------------------------------------------------------------------------------------------ //

-// File API.

-// ------------------------------------------------------------------------------------------ //

-

-/// @brief Opens a file from a drive.

-/// @param fs_path the filesystem path.

-/// @param drive_letter drive name, use NULL to use default drive location.

-/// @return the file descriptor of the file.

-IMPORT_C Ref IoOpenFile(const Char* fs_path, const Char* drive_letter);

-

-/// @brief Closes a file and flushes its content.

-/// @param file_desc the file descriptor.

-/// @return Function doesn't return a type.

-IMPORT_C Void IoCloseFile(_Input Ref file_desc);

-

-/// @brief I/O control (ioctl) on a file.

-/// @param file_desc the file descriptor.

-/// @param ioctl_code the ioctl code.

-/// @param in_data the input data.

-/// @param out_data the output data.

-/// @return the number of bytes written.

-/// @note This function is used to control the file descriptor, introduced for OpenHeFS.

-IMPORT_C SInt32 IoCtrlFile(_Input Ref file_desc, _Input UInt32 ioctl_code, _Input VoidPtr in_data,

-                           _Output VoidPtr out_data);

-

-/// @brief Gets the file mime (if any)

-/// @param file_desc the file descriptor.

-IMPORT_C const Char* IoMimeFile(_Input Ref file_desc);

-

-/// @brief Gets the dir DIM.

-/// @param dir_desc directory descriptor.

-/// @note only works in OpenHeFS, will return nil-x/nil if used on any other filesystem.

-IMPORT_C const Char* IoDimFile(_Input Ref dir_desc);

-

-/// @brief Write data to a file ref

-/// @param file_desc the file descriptor.

-/// @param out_data the data to write.

-/// @param sz_data the size of the data to write.

-/// @return the number of bytes written.

-IMPORT_C UInt32 IoWriteFile(_Input Ref file_desc, _Output VoidPtr out_data, UInt64 sz_data);

-

-/// @brief Read data from a file.

-/// @param file_desc the file descriptor.

-/// @param out_data the data to read.

-/// @param sz_data the size of the data to read.

-IMPORT_C UInt32 IoReadFile(_Input Ref file_desc, _Output VoidPtr* out_data, UInt64 sz_data);

-

-/// @brief Rewind the file pointer to the beginning of the file.

-/// @param file_desc the file descriptor.

-/// @return the number of bytes read.

-IMPORT_C UInt64 IoRewindFile(_Input Ref file_desc);

-

-/// @brief Tell the current position of the file pointer.

-/// @param file_desc the file descriptor.

-/// @return the current position of the file pointer.

-IMPORT_C UInt64 IoTellFile(_Input Ref file_desc);

-

-/// @brief Seek file offset from file descriptor.

-IMPORT_C UInt64 IoSeekFile(_Input Ref file_desc, UInt64 file_offset);

-

-// ------------------------------------------------------------------------

-// Process API.

-// ------------------------------------------------------------------------

-

-/// @brief Spawns a Thread Information Block and Global Information Block inside the current

-/// process.

-/// @param process_id Target Process ID, must be valid.

-/// @return > 0 error occurred or already present, = 0 success.

-IMPORT_C UInt32 RtlSpawnIB(UIntPtr process_id);

-

-/// @brief Spawns a process with a unique pid (stored as UIntPtr).

-/// @param process_path process filesystem path.

-/// @return > 0 process was created.

-IMPORT_C UIntPtr RtlSpawnProcess(const Char* process_path, UInt32 argc, Char** argv, Char** envp,

-                                 UInt32 envp_len);

-

-/// @brief Exits a process with an exit_code.

-/// @return if it has succeeded true, otherwise false.

-IMPORT_C Bool RtlExitProcess(UIntPtr handle, UIntPtr exit_code);

-

-// ------------------------------------------------------------------------

-// Memory Manager API.

-// ------------------------------------------------------------------------

-

-/// @brief Creates a new heap from the process's address space.

-/// @param len the length of it.

-/// @param flags the flags of it.

-/// @return heap pointer.

-IMPORT_C VoidPtr MmCreateHeap(_Input UInt64 len, _Input UInt32 flags);

-

-/// @brief Destroys the pointer

-/// @param heap the heap itself.

-/// @return void.

-IMPORT_C SInt32 MmDestroyHeap(_Input VoidPtr heap);

-

-/// @brief Change protection flags of a memory region.

-IMPORT_C SInt32 MmSetHeapFlags(_Input VoidPtr heap, _Input UInt32 flags);

-

-/// @brief Change protection flags of a memory region.

-IMPORT_C UInt32 MmGetHeapFlags(_Input VoidPtr heap);

-

-/// @brief Fill memory region with CRC32.

-IMPORT_C UInt32 MmFillCRC32Heap(_Input VoidPtr heap);

-

-/// @brief Copy memory region.

-IMPORT_C VoidPtr MmCopyMemory(_Input VoidPtr dest, _Input VoidPtr src, _Input UInt64 len);

-

-/// @brief Compare memory regions.

-IMPORT_C SInt64 MmCmpMemory(_Input VoidPtr dest, _Input VoidPtr src, _Input UInt64 len);

-

-/// @brief Fill memory region.

-IMPORT_C VoidPtr MmFillMemory(_Input VoidPtr dest, _Input UInt64 len, _Input UInt8 value);

-

-/// @brief Compare string regions.

-IMPORT_C SInt64 MmStrCmp(_Input const Char* dest, _Input const Char* src);

-

-/// @brief Get length of string.

-IMPORT_C SInt64 MmStrLen(const Char* str);

-

-// ------------------------------------------------------------------------

-// @brief Error API.

-// ------------------------------------------------------------------------

-

-IMPORT_C SInt32 ErrGetLastError(Void);

-

-// ------------------------------------------------------------------------

-// @brief Threading API.

-// ------------------------------------------------------------------------

-

-/// @brief Exit the current thread.

-/// @param exit_code the exit code.

-IMPORT_C SInt32 ThrExitCurrentThread(_Input SInt32 exit_code);

-

-/// @brief Exit the main thread.

-/// @param exit_code the exit code.

-IMPORT_C SInt32 ThrExitMainThread(_Input SInt32 exit_code);

-

-/// @brief Exit a thread.

-/// @param thread the thread to exit.

-/// @param exit_code the exit code.

-IMPORT_C SInt32 ThrExitThread(_Input ThreadRef thread, _Input SInt32 exit_code);

-

-/// @brief Thread procedure function type.

-typedef SInt32 (*ThrProcKind)(SInt32 argc, Char** argv);

-

-/// @brief Creates a thread.

-/// @param procedure the thread procedure.

-/// @param argument_count number of arguments inside that thread.

-/// @param flags Thread flags.

-/// @return the thread object.

-IMPORT_C ThreadRef ThrCreateThread(const Char* thread_name, ThrProcKind procedure,

-                                   SInt32 argument_count, SInt32 flags);

-

-/// @brief Yields the current thread.

-/// @param thread the thread to yield.

-IMPORT_C SInt32 ThrYieldThread(ThreadRef thrd);

-

-/// @brief Joins a thread.

-/// @param thread the thread to join.

-IMPORT_C SInt32 ThrJoinThread(ThreadRef thrd);

-

-/// @brief Detach a thread.

-/// @param thread the thread to detach.

-IMPORT_C SInt32 ThrDetachThread(ThreadRef thrd);

-

-// ------------------------------------------------------------------------

-// @brief Drive Management API.

-// ------------------------------------------------------------------------

-

-// ------------------------------------------------------------------------------------------ //

-/// @brief Get the default drive letter.

-/// @param void.

-/// @return the drive letter.

-// ------------------------------------------------------------------------------------------ //

-IMPORT_C Char* DrvGetDefaultDriveLetter(Void);

-

-// ------------------------------------------------------------------------------------------ //

-/// @brief Get the drive letter from a path.

-/// @param path the path.

-/// @return the drive letter.

-// ------------------------------------------------------------------------------------------ //

-IMPORT_C Char* DrvGetDriveLetterFromPath(_Input const Char* path);

-

-// ------------------------------------------------------------------------------------------ //

-/// @brief Get a mounted drive from a letter.

-/// @param letter the letter (A..Z).

-/// @return the drive object.

-// ------------------------------------------------------------------------------------------ //

-IMPORT_C Ref DrvGetMountedDrive(_Input Char letter);

-

-// ------------------------------------------------------------------------------------------ //

-/// @brief Mount a drive.

-/// @param path the path to mount.

-/// @param letter the letter to mount.

-// ------------------------------------------------------------------------------------------ //

-IMPORT_C Void DrvMountDrive(_Input const Char* path, _Input const Char* letter);

-

-// ------------------------------------------------------------------------------------------ //

-/// @brief Unmount a drive.

-/// @param letter the letter to unmount.

-// ------------------------------------------------------------------------------------------ //

-IMPORT_C Void DrvUnmountDrive(_Input Char letter);

-

-// ------------------------------------------------------------------------

-// Event handling API, use to listen to OS specific events.

-// ------------------------------------------------------------------------

-

-// ------------------------------------------------------------------------------------------ //

-/// @brief Add an event listener.

-/// @param event_name the event name.

-/// @param listener the listener to add.

-/// @return the event listener.

-// ------------------------------------------------------------------------------------------ //

-

-IMPORT_C Void EvtAddListener(_Input const Char* event_name, _Input Ref listener);

-

-// ------------------------------------------------------------------------------------------ //

-/// @brief Remove an event listener.

-/// @param event_name the event name.

-/// @param listener the listener to remove.

-/// @return the event listener.

-// ------------------------------------------------------------------------------------------ //

-

-IMPORT_C Void EvtRemoveListener(_Input const Char* event_name, _Input Ref listener);

-

-// ------------------------------------------------------------------------------------------ //

-/// @brief Dispatch an event.

-/// @param event_name the event name.

-/// @param event_data the event data.

-/// @return the event data.

-// ------------------------------------------------------------------------------------------ //

-

-IMPORT_C VoidPtr EvtDispatchEvent(_Input const Char* event_name, _Input VoidPtr event_data);

-

-// ------------------------------------------------------------------------------------------ //

-// Power API.

-// ------------------------------------------------------------------------------------------ //

-

-enum {

-  kPowerCodeInvalid  = 0,

-  kPowerCodeShutdown = 12,

-  kPowerCodeReboot,

-  kPowerCodeSleep,

-  kPowerCodeWake,

-  kPowerCodeCount,

-};

-

-IMPORT_C SInt32 PwrReadCode(_Output SInt32& code);

-

-IMPORT_C SInt32 PwrSendCode(_Output SInt32& code);

-

-// ------------------------------------------------------------------------------------------ //

-// CD-ROM API.

-// ------------------------------------------------------------------------------------------ //

-

-IMPORT_C IORef CdOpenTray(Void);

-

-IMPORT_C SInt32 CdEjectDrive(_Input IORef cdrom);

-

-IMPORT_C SInt32 CdCloseTray(Void);

-

-// ------------------------------------------------------------------------------------------ //

-// TTY API.

-// ------------------------------------------------------------------------------------------ //

-

-IMPORT_C SInt32 PrintOut(IORef file /* nullptr to direct to stdout */, const Char* fmt, ...);

-

-IMPORT_C SInt32 PrintIn(IORef file /* nullptr to direct to stdout */, const Char* fmt, ...);

-

-IMPORT_C IORef PrintCreate(Void);

-

-IMPORT_C SInt32 PrintRelease(IORef);

-

-IMPORT_C IORef PrintGet(const Char* path);

-

-// ------------------------------------------------------------------------------------------ //

-// @brief Scheduler/Debug API.

-// ------------------------------------------------------------------------------------------ //

-

-typedef SInt32 AffinityRef;

-typedef UInt64 ProcessRef;

-

-IMPORT_C SInt32 SchedSetAffinity(_Input ProcessRef, SInt32 req, _Input AffinityRef*);

-

-IMPORT_C SInt32 SchedGetAffinity(_Input ProcessRef, _InOut AffinityRef*);

-

-IMPORT_C SInt32 SchedFireSignal(_Input ProcessRef, SInt32);

-

-IMPORT_C SInt32 SchedReadMemory(_Input ProcessRef, SInt32, SInt32);

-

-IMPORT_C SInt32 SchedWriteMemory(_Input ProcessRef, SInt32, SInt32);

-

-IMPORT_C UIntPtr SchedGetCurrentProcessID(Void);

-

-// ------------------------------------------------------------------------------------------ //

-// @brief Filesystem API.

-// ------------------------------------------------------------------------------------------ //

-

-IMPORT_C BOOL FsCopy(const Char* path, const Char* dst);

-

-IMPORT_C BOOL FsMove(const Char* path, const Char* dst);

-

-IMPORT_C BOOL FsExists(const Char* path);

-

-IMPORT_C BOOL FsCreateDir(const Char* path);

-

-IMPORT_C BOOL FsCreateFile(const Char* path);

-

-IMPORT_C BOOL FsCreateAlias(const Char* path, const Char* from);

-

-// ------------------------------------------------------------------------------------------ //

-// @brief Installable Filesystem API.

-// ------------------------------------------------------------------------------------------ //

-

-IMPORT_C BOOL IfsMount(const Char* path, const Char* drive_letter);

-

-IMPORT_C BOOL IfsUnmount(const Char* drive_letter);

-

-IMPORT_C BOOL IfsIsMounted(const Char* drive_letter);

-

-// ------------------------------------------------------------------------------------------ //

-// @brief String Manip API.

-// ------------------------------------------------------------------------------------------ //

-

-IMPORT_C Char* StrFmt(const Char* fmt, ...);

-

-IMPORT_C UInt64 StrMathToNumber(const Char* in, const Char** endp, const SInt16 base);

-

-#endif  // ifndef LIBSYS_SYSTEM_CALLS_H

+// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
+// Licensed under the Apache License, Version 2.0 (see LICENSE file)
+// Official repository: https://github.com/nekernel-org/nekernel
+
+#ifndef LIBSYS_SYSTEM_CALLS_H
+#define LIBSYS_SYSTEM_CALLS_H
+
+#include <libSystem/SystemKit/Macros.h>
+
+/// @brief TTY device path.
+#define kPrintDevicePath "/devices/tty{}"
+#define kCDDevicePath "/devices/dvd{}"
+
+// ------------------------------------------------------------------------------------------ //
+/// @brief Types API.
+// ------------------------------------------------------------------------------------------ //
+
+struct REF_TYPE {
+  UInt64  __hash;  /// @brief Hash of the syscall
+  VoidPtr __self;  /// @brief Syscall self value.
+};
+
+typedef REF_TYPE* Ref;
+
+typedef Ref IORef;
+typedef Ref FSRef;
+typedef Ref DylibRef;
+typedef Ref ThreadRef;
+typedef Ref SocketRef;
+typedef Ref NetworkRef;
+typedef Ref MutexRef;
+typedef Ref EventRef;
+typedef Ref SemaphoreRef;
+
+// ------------------------------------------------------------------------------------------ //
+/// @brief Dynamic Loader API.
+// ------------------------------------------------------------------------------------------ //
+
+/// @brief Get function which is part of the Dylib.
+/// @param symbol the symbol to look for
+/// @param dll_handle the Dylib handle.
+/// @return the proc pointer.
+IMPORT_C Ref LdrGetDylibSymbolFromHandle(_Input const Char* symbol, _Input Ref dll_handle);
+
+/// @brief Open Dylib handle.
+/// @param path dll path.
+/// @param drv driver letter.
+/// @return a dylib ref.
+IMPORT_C Ref LdrOpenDylibHandle(_Input const Char* path, _Input const Char* drive_letter);
+
+/// @brief Close Dylib handle
+/// @param dll_handle the dylib ref.
+/// @return whether it closed or not.
+IMPORT_C UInt32 LdrCloseDylibHandle(_Input Ref* dll_handle);
+
+// ------------------------------------------------------------------------------------------ //
+// File API.
+// ------------------------------------------------------------------------------------------ //
+
+/// @brief Opens a file from a drive.
+/// @param fs_path the filesystem path.
+/// @param drive_letter drive name, use NULL to use default drive location.
+/// @return the file descriptor of the file.
+IMPORT_C Ref IoOpenFile(const Char* fs_path, const Char* drive_letter);
+
+/// @brief Closes a file and flushes its content.
+/// @param file_desc the file descriptor.
+/// @return Function doesn't return a type.
+IMPORT_C Void IoCloseFile(_Input Ref file_desc);
+
+/// @brief I/O control (ioctl) on a file.
+/// @param file_desc the file descriptor.
+/// @param ioctl_code the ioctl code.
+/// @param in_data the input data.
+/// @param out_data the output data.
+/// @return the number of bytes written.
+/// @note This function is used to control the file descriptor, introduced for OpenHeFS.
+IMPORT_C SInt32 IoCtrlFile(_Input Ref file_desc, _Input UInt32 ioctl_code, _Input VoidPtr in_data,
+                           _Output VoidPtr out_data);
+
+/// @brief Gets the file mime (if any)
+/// @param file_desc the file descriptor.
+IMPORT_C const Char* IoMimeFile(_Input Ref file_desc);
+
+/// @brief Gets the dir DIM.
+/// @param dir_desc directory descriptor.
+/// @note only works in OpenHeFS, will return nil-x/nil if used on any other filesystem.
+IMPORT_C const Char* IoDimFile(_Input Ref dir_desc);
+
+/// @brief Write data to a file ref
+/// @param file_desc the file descriptor.
+/// @param out_data the data to write.
+/// @param sz_data the size of the data to write.
+/// @return the number of bytes written.
+IMPORT_C UInt32 IoWriteFile(_Input Ref file_desc, _Output VoidPtr out_data, UInt64 sz_data);
+
+/// @brief Read data from a file.
+/// @param file_desc the file descriptor.
+/// @param out_data the data to read.
+/// @param sz_data the size of the data to read.
+IMPORT_C UInt32 IoReadFile(_Input Ref file_desc, _Output VoidPtr* out_data, UInt64 sz_data);
+
+/// @brief Rewind the file pointer to the beginning of the file.
+/// @param file_desc the file descriptor.
+/// @return the number of bytes read.
+IMPORT_C UInt64 IoRewindFile(_Input Ref file_desc);
+
+/// @brief Tell the current position of the file pointer.
+/// @param file_desc the file descriptor.
+/// @return the current position of the file pointer.
+IMPORT_C UInt64 IoTellFile(_Input Ref file_desc);
+
+/// @brief Seek file offset from file descriptor.
+IMPORT_C UInt64 IoSeekFile(_Input Ref file_desc, UInt64 file_offset);
+
+// ------------------------------------------------------------------------
+// Process API.
+// ------------------------------------------------------------------------
+
+/// @brief Spawns a Thread Information Block and Global Information Block inside the current
+/// process.
+/// @param process_id Target Process ID, must be valid.
+/// @return > 0 error occurred or already present, = 0 success.
+IMPORT_C UInt32 RtlSpawnIB(UIntPtr process_id);
+
+/// @brief Spawns a process with a unique pid (stored as UIntPtr).
+/// @param process_path process filesystem path.
+/// @return > 0 process was created.
+IMPORT_C UIntPtr RtlSpawnProcess(const Char* process_path, UInt32 argc, Char** argv, Char** envp,
+                                 UInt32 envp_len);
+
+/// @brief Exits a process with an exit_code.
+/// @return if it has succeeded true, otherwise false.
+IMPORT_C Bool RtlExitProcess(UIntPtr handle, UIntPtr exit_code);
+
+// ------------------------------------------------------------------------
+// Memory Manager API.
+// ------------------------------------------------------------------------
+
+/// @brief Creates a new heap from the process's address space.
+/// @param len the length of it.
+/// @param flags the flags of it.
+/// @return heap pointer.
+IMPORT_C VoidPtr MmCreateHeap(_Input UInt64 len, _Input UInt32 flags);
+
+/// @brief Destroys the pointer
+/// @param heap the heap itself.
+/// @return void.
+IMPORT_C SInt32 MmDestroyHeap(_Input VoidPtr heap);
+
+/// @brief Change protection flags of a memory region.
+IMPORT_C SInt32 MmSetHeapFlags(_Input VoidPtr heap, _Input UInt32 flags);
+
+/// @brief Change protection flags of a memory region.
+IMPORT_C UInt32 MmGetHeapFlags(_Input VoidPtr heap);
+
+/// @brief Fill memory region with CRC32.
+IMPORT_C UInt32 MmFillCRC32Heap(_Input VoidPtr heap);
+
+/// @brief Copy memory region.
+IMPORT_C VoidPtr MmCopyMemory(_Input VoidPtr dest, _Input VoidPtr src, _Input UInt64 len);
+
+/// @brief Compare memory regions.
+IMPORT_C SInt64 MmCmpMemory(_Input VoidPtr dest, _Input VoidPtr src, _Input UInt64 len);
+
+/// @brief Fill memory region.
+IMPORT_C VoidPtr MmFillMemory(_Input VoidPtr dest, _Input UInt64 len, _Input UInt8 value);
+
+/// @brief Compare string regions.
+IMPORT_C SInt64 MmStrCmp(_Input const Char* dest, _Input const Char* src);
+
+/// @brief Get length of string.
+IMPORT_C SInt64 MmStrLen(const Char* str);
+
+// ------------------------------------------------------------------------
+// @brief Error API.
+// ------------------------------------------------------------------------
+
+IMPORT_C SInt32 ErrGetLastError(Void);
+
+// ------------------------------------------------------------------------
+// @brief Threading API.
+// ------------------------------------------------------------------------
+
+/// @brief Exit the current thread.
+/// @param exit_code the exit code.
+IMPORT_C SInt32 ThrExitCurrentThread(_Input SInt32 exit_code);
+
+/// @brief Exit the main thread.
+/// @param exit_code the exit code.
+IMPORT_C SInt32 ThrExitMainThread(_Input SInt32 exit_code);
+
+/// @brief Exit a thread.
+/// @param thread the thread to exit.
+/// @param exit_code the exit code.
+IMPORT_C SInt32 ThrExitThread(_Input ThreadRef thread, _Input SInt32 exit_code);
+
+/// @brief Thread procedure function type.
+typedef SInt32 (*ThrProcKind)(SInt32 argc, Char** argv);
+
+/// @brief Creates a thread.
+/// @param procedure the thread procedure.
+/// @param argument_count number of arguments inside that thread.
+/// @param flags Thread flags.
+/// @return the thread object.
+IMPORT_C ThreadRef ThrCreateThread(const Char* thread_name, ThrProcKind procedure,
+                                   SInt32 argument_count, SInt32 flags);
+
+/// @brief Yields the current thread.
+/// @param thread the thread to yield.
+IMPORT_C SInt32 ThrYieldThread(ThreadRef thrd);
+
+/// @brief Joins a thread.
+/// @param thread the thread to join.
+IMPORT_C SInt32 ThrJoinThread(ThreadRef thrd);
+
+/// @brief Detach a thread.
+/// @param thread the thread to detach.
+IMPORT_C SInt32 ThrDetachThread(ThreadRef thrd);
+
+// ------------------------------------------------------------------------
+// @brief Drive Management API.
+// ------------------------------------------------------------------------
+
+// ------------------------------------------------------------------------------------------ //
+/// @brief Get the default drive letter.
+/// @param void.
+/// @return the drive letter.
+// ------------------------------------------------------------------------------------------ //
+IMPORT_C Char* DrvGetDefaultDriveLetter(Void);
+
+// ------------------------------------------------------------------------------------------ //
+/// @brief Get the drive letter from a path.
+/// @param path the path.
+/// @return the drive letter.
+// ------------------------------------------------------------------------------------------ //
+IMPORT_C Char* DrvGetDriveLetterFromPath(_Input const Char* path);
+
+// ------------------------------------------------------------------------------------------ //
+/// @brief Get a mounted drive from a letter.
+/// @param letter the letter (A..Z).
+/// @return the drive object.
+// ------------------------------------------------------------------------------------------ //
+IMPORT_C Ref DrvGetMountedDrive(_Input Char letter);
+
+// ------------------------------------------------------------------------------------------ //
+/// @brief Mount a drive.
+/// @param path the path to mount.
+/// @param letter the letter to mount.
+// ------------------------------------------------------------------------------------------ //
+IMPORT_C Void DrvMountDrive(_Input const Char* path, _Input const Char* letter);
+
+// ------------------------------------------------------------------------------------------ //
+/// @brief Unmount a drive.
+/// @param letter the letter to unmount.
+// ------------------------------------------------------------------------------------------ //
+IMPORT_C Void DrvUnmountDrive(_Input Char letter);
+
+// ------------------------------------------------------------------------
+// Event handling API, use to listen to OS specific events.
+// ------------------------------------------------------------------------
+
+// ------------------------------------------------------------------------------------------ //
+/// @brief Add an event listener.
+/// @param event_name the event name.
+/// @param listener the listener to add.
+/// @return the event listener.
+// ------------------------------------------------------------------------------------------ //
+
+IMPORT_C Void EvtAddListener(_Input const Char* event_name, _Input Ref listener);
+
+// ------------------------------------------------------------------------------------------ //
+/// @brief Remove an event listener.
+/// @param event_name the event name.
+/// @param listener the listener to remove.
+/// @return the event listener.
+// ------------------------------------------------------------------------------------------ //
+
+IMPORT_C Void EvtRemoveListener(_Input const Char* event_name, _Input Ref listener);
+
+// ------------------------------------------------------------------------------------------ //
+/// @brief Dispatch an event.
+/// @param event_name the event name.
+/// @param event_data the event data.
+/// @return the event data.
+// ------------------------------------------------------------------------------------------ //
+
+IMPORT_C VoidPtr EvtDispatchEvent(_Input const Char* event_name, _Input VoidPtr event_data);
+
+// ------------------------------------------------------------------------------------------ //
+// Power API.
+// ------------------------------------------------------------------------------------------ //
+
+enum {
+  kPowerCodeInvalid  = 0,
+  kPowerCodeShutdown = 12,
+  kPowerCodeReboot,
+  kPowerCodeSleep,
+  kPowerCodeWake,
+  kPowerCodeCount,
+};
+
+IMPORT_C SInt32 PwrReadCode(_Output SInt32& code);
+
+IMPORT_C SInt32 PwrSendCode(_Output SInt32& code);
+
+// ------------------------------------------------------------------------------------------ //
+// CD-ROM API.
+// ------------------------------------------------------------------------------------------ //
+
+IMPORT_C IORef CdOpenTray(Void);
+
+IMPORT_C SInt32 CdEjectDrive(_Input IORef cdrom);
+
+IMPORT_C SInt32 CdCloseTray(Void);
+
+// ------------------------------------------------------------------------------------------ //
+// TTY API.
+// ------------------------------------------------------------------------------------------ //
+
+IMPORT_C SInt32 PrintOut(IORef file /* nullptr to direct to stdout */, const Char* fmt, ...);
+
+IMPORT_C SInt32 PrintIn(IORef file /* nullptr to direct to stdout */, const Char* fmt, ...);
+
+IMPORT_C IORef PrintCreate(Void);
+
+IMPORT_C SInt32 PrintRelease(IORef);
+
+IMPORT_C IORef PrintGet(const Char* path);
+
+// ------------------------------------------------------------------------------------------ //
+// @brief Scheduler/Debug API.
+// ------------------------------------------------------------------------------------------ //
+
+typedef SInt32 AffinityRef;
+typedef UInt64 ProcessRef;
+
+IMPORT_C SInt32 SchedSetAffinity(_Input ProcessRef, SInt32 req, _Input AffinityRef*);
+
+IMPORT_C SInt32 SchedGetAffinity(_Input ProcessRef, _InOut AffinityRef*);
+
+IMPORT_C SInt32 SchedFireSignal(_Input ProcessRef, SInt32);
+
+IMPORT_C SInt32 SchedReadMemory(_Input ProcessRef, SInt32, SInt32);
+
+IMPORT_C SInt32 SchedWriteMemory(_Input ProcessRef, SInt32, SInt32);
+
+IMPORT_C UIntPtr SchedGetCurrentProcessID(Void);
+
+// ------------------------------------------------------------------------------------------ //
+// @brief Filesystem API.
+// ------------------------------------------------------------------------------------------ //
+
+IMPORT_C BOOL FsCopy(const Char* path, const Char* dst);
+
+IMPORT_C BOOL FsMove(const Char* path, const Char* dst);
+
+IMPORT_C BOOL FsExists(const Char* path);
+
+IMPORT_C BOOL FsCreateDir(const Char* path);
+
+IMPORT_C BOOL FsCreateFile(const Char* path);
+
+IMPORT_C BOOL FsCreateAlias(const Char* path, const Char* from);
+
+// ------------------------------------------------------------------------------------------ //
+// @brief Installable Filesystem API.
+// ------------------------------------------------------------------------------------------ //
+
+IMPORT_C BOOL IfsMount(const Char* path, const Char* drive_letter);
+
+IMPORT_C BOOL IfsUnmount(const Char* drive_letter);
+
+IMPORT_C BOOL IfsIsMounted(const Char* drive_letter);
+
+// ------------------------------------------------------------------------------------------ //
+// @brief String Manip API.
+// ------------------------------------------------------------------------------------------ //
+
+IMPORT_C Char* StrFmt(const Char* fmt, ...);
+
+IMPORT_C UInt64 StrMathToNumber(const Char* in, const Char** endp, const SInt16 base);
+
+#endif  // ifndef LIBSYS_SYSTEM_CALLS_H
diff --git a/src/libSystem/SystemKit/Verify.h b/src/libSystem/SystemKit/Verify.h
index 0bdfd2ca..0657bc24 100644
--- a/src/libSystem/SystemKit/Verify.h
+++ b/src/libSystem/SystemKit/Verify.h
@@ -1,11 +1,6 @@
-/* ========================================
-
-   Copyright (C) 2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
-
-   File: Verify.h
-   Purpose: System Call Interface Verification Layer.
-
-   ======================================== */
+// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
+// Licensed under the Apache License, Version 2.0 (see LICENSE file)
+// Official repository: https://github.com/nekernel-org/nekernel
 
 #ifndef SYSTEMKIT_VERIFY_H
 #define SYSTEMKIT_VERIFY_H
diff --git a/src/libSystem/src/JailCalls.cc b/src/libSystem/src/JailCalls.cc
index f7ca5bec..7a3218bf 100644
--- a/src/libSystem/src/JailCalls.cc
+++ b/src/libSystem/src/JailCalls.cc
@@ -1,8 +1,6 @@
-/* ========================================
-
-  Copyright (C) 2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
-
-======================================== */
+// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
+// Licensed under the Apache License, Version 2.0 (see LICENSE file)
+// Official repository: https://github.com/nekernel-org/nekernel
 
 #include <libSystem/SystemKit/Err.h>
 #include <libSystem/SystemKit/Jail.h>
diff --git a/src/libSystem/src/SystemCalls.cc b/src/libSystem/src/SystemCalls.cc
index c9dc1c52..0574d7ba 100644
--- a/src/libSystem/src/SystemCalls.cc
+++ b/src/libSystem/src/SystemCalls.cc
@@ -1,169 +1,168 @@
-/* ========================================

-

-  Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.

-

-======================================== */

-

-#include <libSystem/SystemKit/Err.h>

-#include <libSystem/SystemKit/Syscall.h>

-#include <libSystem/SystemKit/System.h>

-#include <libSystem/SystemKit/Verify.h>

-

-using namespace LibSystem;

-

-IMPORT_C Char* StrFmt(const Char* fmt, ...) {

-  if (!fmt || *fmt == 0) return const_cast<Char*>("(null)");

-

-  return const_cast<Char*>("");

-}

-

-// memmove-style copy

-IMPORT_C VoidPtr MmCopyMemory(_Input VoidPtr dest, _Input VoidPtr src, _Input UInt64 len) {

-  // handles overlap, prefers 64-bit word copies when aligned

-  if (!len || !dest || !src) return nullptr;

-

-  auto s = static_cast<const UInt8*>(src);

-  auto d = static_cast<UInt8*>(dest);

-

-  if (d == s) return dest;

-

-  // decide direction

-  if (d > s && d < s + len) {

-    const UInt8* rs = s + len;

-    UInt8*       rd = d + len;

-

-    // try 64-bit aligned backward copy

-    if (len >= sizeof(UInt64) && (reinterpret_cast<UIntPtr>(rs) % sizeof(UInt64) == 0) &&

-        (reinterpret_cast<UIntPtr>(rd) % sizeof(UInt64) == 0)) {

-      auto rsw = reinterpret_cast<const UInt64*>(rs);

-      auto rdw = reinterpret_cast<UInt64*>(rd);

-

-      SizeT words = len / sizeof(UInt64);

-

-      for (SizeT i = 0; i < words; ++i) {

-        rdw[-1 - static_cast<SizeT>(i)] = rsw[-1 - static_cast<SizeT>(i)];

-      }

-

-      SizeT rem = len % sizeof(UInt64);

-      for (SizeT i = 0; i < rem; ++i) {

-        rd[-1 - i] = rs[-1 - i];

-      }

-    } else {

-      // byte-wise backward

-      for (SizeT i = 0; i < len; ++i) {

-        rd[-1 - i] = rs[-1 - i];

-      }

-    }

-  } else {

-    // try 64-bit aligned forward copy

-    if (len >= sizeof(UInt64) && (reinterpret_cast<UIntPtr>(s) % sizeof(UInt64) == 0) &&

-        (reinterpret_cast<UIntPtr>(d) % sizeof(UInt64) == 0)) {

-      auto  sw    = reinterpret_cast<const UInt64*>(s);

-      auto  dw    = reinterpret_cast<UInt64*>(d);

-      SizeT words = len / sizeof(UInt64);

-

-      for (SizeT i = 0; i < words; ++i) {

-        dw[i] = sw[i];

-      }

-

-      SizeT       rem    = len % sizeof(UInt64);

-      const SizeT offset = words * sizeof(UInt64);

-      for (SizeT i = 0; i < rem; ++i) {

-        d[offset + i] = s[offset + i];

-      }

-    } else {

-      for (SizeT i = 0; i < len; ++i) {

-        d[i] = s[i];

-      }

-    }

-  }

-

-  return dest;

-}

-

-IMPORT_C SInt64 MmStrLen(const Char* in) {

-  // strlen via pointer walk

-  if (!in) return -kErrorInvalidData;

-

-  const Char* p = in;

-  while (*p) ++p;

-

-  return static_cast<SInt64>(p - in);

-}

-

-IMPORT_C VoidPtr MmFillMemory(_Input VoidPtr dest, _Input UInt64 len, _Input UInt8 value) {

-  if (!len || !dest) return nullptr;

-

-  auto d = static_cast<UInt8*>(dest);

-

-  if (len >= sizeof(UInt64) && (reinterpret_cast<UIntPtr>(d) % sizeof(UInt64)) == 0) {

-    UInt64 pattern = static_cast<UInt64>(value);

-    pattern |= (pattern << 8);

-    pattern |= (pattern << 16);

-    pattern |= (pattern << 32);

-

-    auto  dw    = reinterpret_cast<UInt64*>(d);

-    SizeT words = len / sizeof(UInt64);

-

-    for (SizeT i = 0; i < words; ++i) {

-      dw[i] = pattern;

-    }

-

-    SizeT       rem    = len % sizeof(UInt64);

-    const SizeT offset = words * sizeof(UInt64);

-    for (SizeT i = 0; i < rem; ++i) {

-      d[offset + i] = value;

-    }

-  } else {

-    for (SizeT i = 0; i < len; ++i) d[i] = value;

-  }

-

-  return dest;

-}

-

-IMPORT_C Ref IoOpenFile(_Input const Char* path, _Input const Char* drv_letter) {

-  return static_cast<Ref>(libsys_syscall_arg_3(

-      SYSCALL_HASH("IoOpenFile"), Verify::sys_safe_cast<Char, Void>(path), Verify::sys_safe_cast<Char, Void>(drv_letter)));

-}

-

-IMPORT_C Void IoCloseFile(_Input Ref desc) {

-  libsys_syscall_arg_2(SYSCALL_HASH("IoCloseFile"), static_cast<VoidPtr>(desc));

-}

-

-IMPORT_C UInt64 IoSeekFile(_Input Ref desc, _Input UInt64 off) {

-  auto ret_ptr = libsys_syscall_arg_3(SYSCALL_HASH("IoSeekFile"), static_cast<VoidPtr>(desc),

-                                      reinterpret_cast<VoidPtr>(&off));

-

-  if (!ret_ptr) return ~0UL;

-

-  auto   ret    = static_cast<volatile UInt64*>(ret_ptr);

-  UInt64 result = *ret;

-  MUST_PASS(result != ~0UL);

-  return result;

-}

-

-IMPORT_C UInt64 IoTellFile(_Input Ref desc) {

-  auto ret_ptr = libsys_syscall_arg_2(SYSCALL_HASH("IoTellFile"), static_cast<VoidPtr>(desc));

-  if (!ret_ptr) return ~0UL;

-  auto ret = static_cast<volatile UInt64*>(ret_ptr);

-  return *ret;

-}

-

-IMPORT_C SInt32 PrintOut(_Input IORef desc, const Char* fmt, ...) {

-  va_list args;

-  va_start(args, fmt);

-

-  auto buf = StrFmt(fmt, args);

-

-  va_end(args);

-

-  // if truncated, `needed` >= kBufferSz; we still send truncated buffer

-  auto ret_ptr = libsys_syscall_arg_3(SYSCALL_HASH("PrintOut"), static_cast<VoidPtr>(desc),

-                                      Verify::sys_safe_cast<Char, Void>(buf));

-

-  if (!ret_ptr) return -kErrorInvalidData;

-

-  auto ret = static_cast<const volatile SInt32*>(ret_ptr);

-

-  return *ret;

-}

+// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
+// Licensed under the Apache License, Version 2.0 (see LICENSE file)
+// Official repository: https://github.com/nekernel-org/nekernel
+
+#include <libSystem/SystemKit/Err.h>
+#include <libSystem/SystemKit/Syscall.h>
+#include <libSystem/SystemKit/System.h>
+#include <libSystem/SystemKit/Verify.h>
+
+using namespace LibSystem;
+
+IMPORT_C Char* StrFmt(const Char* fmt, ...) {
+  if (!fmt || *fmt == 0) return const_cast<Char*>("(null)");
+
+  return const_cast<Char*>("");
+}
+
+// memmove-style copy
+IMPORT_C VoidPtr MmCopyMemory(_Input VoidPtr dest, _Input VoidPtr src, _Input UInt64 len) {
+  // handles overlap, prefers 64-bit word copies when aligned
+  if (!len || !dest || !src) return nullptr;
+
+  auto s = static_cast<const UInt8*>(src);
+  auto d = static_cast<UInt8*>(dest);
+
+  if (d == s) return dest;
+
+  // decide direction
+  if (d > s && d < s + len) {
+    const UInt8* rs = s + len;
+    UInt8*       rd = d + len;
+
+    // try 64-bit aligned backward copy
+    if (len >= sizeof(UInt64) && (reinterpret_cast<UIntPtr>(rs) % sizeof(UInt64) == 0) &&
+        (reinterpret_cast<UIntPtr>(rd) % sizeof(UInt64) == 0)) {
+      auto rsw = reinterpret_cast<const UInt64*>(rs);
+      auto rdw = reinterpret_cast<UInt64*>(rd);
+
+      SizeT words = len / sizeof(UInt64);
+
+      for (SizeT i = 0; i < words; ++i) {
+        rdw[-1 - static_cast<SizeT>(i)] = rsw[-1 - static_cast<SizeT>(i)];
+      }
+
+      SizeT rem = len % sizeof(UInt64);
+      for (SizeT i = 0; i < rem; ++i) {
+        rd[-1 - i] = rs[-1 - i];
+      }
+    } else {
+      // byte-wise backward
+      for (SizeT i = 0; i < len; ++i) {
+        rd[-1 - i] = rs[-1 - i];
+      }
+    }
+  } else {
+    // try 64-bit aligned forward copy
+    if (len >= sizeof(UInt64) && (reinterpret_cast<UIntPtr>(s) % sizeof(UInt64) == 0) &&
+        (reinterpret_cast<UIntPtr>(d) % sizeof(UInt64) == 0)) {
+      auto  sw    = reinterpret_cast<const UInt64*>(s);
+      auto  dw    = reinterpret_cast<UInt64*>(d);
+      SizeT words = len / sizeof(UInt64);
+
+      for (SizeT i = 0; i < words; ++i) {
+        dw[i] = sw[i];
+      }
+
+      SizeT       rem    = len % sizeof(UInt64);
+      const SizeT offset = words * sizeof(UInt64);
+      for (SizeT i = 0; i < rem; ++i) {
+        d[offset + i] = s[offset + i];
+      }
+    } else {
+      for (SizeT i = 0; i < len; ++i) {
+        d[i] = s[i];
+      }
+    }
+  }
+
+  return dest;
+}
+
+IMPORT_C SInt64 MmStrLen(const Char* in) {
+  // strlen via pointer walk
+  if (!in) return -kErrorInvalidData;
+
+  const Char* p = in;
+  while (*p) ++p;
+
+  return static_cast<SInt64>(p - in);
+}
+
+IMPORT_C VoidPtr MmFillMemory(_Input VoidPtr dest, _Input UInt64 len, _Input UInt8 value) {
+  if (!len || !dest) return nullptr;
+
+  auto d = static_cast<UInt8*>(dest);
+
+  if (len >= sizeof(UInt64) && (reinterpret_cast<UIntPtr>(d) % sizeof(UInt64)) == 0) {
+    UInt64 pattern = static_cast<UInt64>(value);
+    pattern |= (pattern << 8);
+    pattern |= (pattern << 16);
+    pattern |= (pattern << 32);
+
+    auto  dw    = reinterpret_cast<UInt64*>(d);
+    SizeT words = len / sizeof(UInt64);
+
+    for (SizeT i = 0; i < words; ++i) {
+      dw[i] = pattern;
+    }
+
+    SizeT       rem    = len % sizeof(UInt64);
+    const SizeT offset = words * sizeof(UInt64);
+    for (SizeT i = 0; i < rem; ++i) {
+      d[offset + i] = value;
+    }
+  } else {
+    for (SizeT i = 0; i < len; ++i) d[i] = value;
+  }
+
+  return dest;
+}
+
+IMPORT_C Ref IoOpenFile(_Input const Char* path, _Input const Char* drv_letter) {
+  return static_cast<Ref>(libsys_syscall_arg_3(SYSCALL_HASH("IoOpenFile"),
+                                               Verify::sys_safe_cast<Char, Void>(path),
+                                               Verify::sys_safe_cast<Char, Void>(drv_letter)));
+}
+
+IMPORT_C Void IoCloseFile(_Input Ref desc) {
+  libsys_syscall_arg_2(SYSCALL_HASH("IoCloseFile"), static_cast<VoidPtr>(desc));
+}
+
+IMPORT_C UInt64 IoSeekFile(_Input Ref desc, _Input UInt64 off) {
+  auto ret_ptr = libsys_syscall_arg_3(SYSCALL_HASH("IoSeekFile"), static_cast<VoidPtr>(desc),
+                                      reinterpret_cast<VoidPtr>(&off));
+
+  if (!ret_ptr) return ~0UL;
+
+  auto   ret    = static_cast<volatile UInt64*>(ret_ptr);
+  UInt64 result = *ret;
+  MUST_PASS(result != ~0UL);
+  return result;
+}
+
+IMPORT_C UInt64 IoTellFile(_Input Ref desc) {
+  auto ret_ptr = libsys_syscall_arg_2(SYSCALL_HASH("IoTellFile"), static_cast<VoidPtr>(desc));
+  if (!ret_ptr) return ~0UL;
+  auto ret = static_cast<volatile UInt64*>(ret_ptr);
+  return *ret;
+}
+
+IMPORT_C SInt32 PrintOut(_Input IORef desc, const Char* fmt, ...) {
+  va_list args;
+  va_start(args, fmt);
+
+  auto buf = StrFmt(fmt, args);
+
+  va_end(args);
+
+  // if truncated, `needed` >= kBufferSz; we still send truncated buffer
+  auto ret_ptr = libsys_syscall_arg_3(SYSCALL_HASH("PrintOut"), static_cast<VoidPtr>(desc),
+                                      Verify::sys_safe_cast<Char, Void>(buf));
+
+  if (!ret_ptr) return -kErrorInvalidData;
+
+  auto ret = static_cast<const volatile SInt32*>(ret_ptr);
+
+  return *ret;
+}
diff --git a/src/libSystem/src/Utils.cc b/src/libSystem/src/Utils.cc
index 9d0920e0..3ccfafa2 100644
--- a/src/libSystem/src/Utils.cc
+++ b/src/libSystem/src/Utils.cc
@@ -1,8 +1,6 @@
-/* ========================================
-
-  Copyright (C) 2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
-
-======================================== */
+// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
+// Licensed under the Apache License, Version 2.0 (see LICENSE file)
+// Official repository: https://github.com/nekernel-org/nekernel
 
 #include <libSystem/SystemKit/Err.h>
 #include <libSystem/SystemKit/Syscall.h>
diff --git a/src/libSystem/src/VerifyCalls.cc b/src/libSystem/src/VerifyCalls.cc
index 1c00612f..f23417e9 100644
--- a/src/libSystem/src/VerifyCalls.cc
+++ b/src/libSystem/src/VerifyCalls.cc
@@ -1,8 +1,6 @@
-/* ========================================
-
-  Copyright (C) 2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
-
-======================================== */
+// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
+// Licensed under the Apache License, Version 2.0 (see LICENSE file)
+// Official repository: https://github.com/nekernel-org/nekernel
 
 #include <libSystem/SystemKit/Err.h>
 #include <libSystem/SystemKit/Syscall.h>