diff --git a/include/logfile.h b/include/logfile.h
new file mode 100644
index 000000000..8f302994c
--- /dev/null
+++ b/include/logfile.h
@@ -0,0 +1,16 @@
+/**
+ * Author......: Jens Steube <jens.steube@gmail.com>
+ * License.....: MIT
+ */
+
+#pragma once
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <time.h>
+
+char *logfile_generate_topid (void);
+char *logfile_generate_subid (void);
+
+void logfile_append (const char *fmt, ...);
diff --git a/include/shared.h b/include/shared.h
index f2b5a4e87..2521c876a 100644
--- a/include/shared.h
+++ b/include/shared.h
@@ -24,7 +24,6 @@
 #include <dlfcn.h>
 #include <pwd.h>
 #include <limits.h>
-#include <termios.h>
 #include <sys/ioctl.h>
 #include <sys/sysctl.h>
 #endif // _POSIX
diff --git a/include/terminal.h b/include/terminal.h
new file mode 100644
index 000000000..8155fb8ff
--- /dev/null
+++ b/include/terminal.h
@@ -0,0 +1,23 @@
+/**
+ * Author......: Jens Steube <jens.steube@gmail.com>
+ * License.....: MIT
+ */
+
+#pragma once
+
+#include <stdio.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#ifdef _POSIX
+#include <termios.h>
+#endif // _POSIX
+
+#ifdef _WIN
+#include <windows.h>
+#endif // _WIN
+
+int tty_break();
+int tty_getchar();
+int tty_fix();
diff --git a/src/Makefile b/src/Makefile
index 36b425a4e..2ad3b0ae0 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -165,7 +165,7 @@ LFLAGS_CROSS_WIN         := -lpsapi
 ## Objects
 ##
 
-NATIVE_OBJS              := obj/logfile.NATIVE.o obj/data.NATIVE.o obj/convert.NATIVE.o obj/memory.NATIVE.o obj/logging.NATIVE.o obj/cpu_aes.NATIVE.o obj/cpu_des.NATIVE.o obj/cpu_md5.NATIVE.o obj/cpu_sha1.NATIVE.o obj/cpu_sha256.NATIVE.o obj/bitops.NATIVE.o obj/bitops.NATIVE.o obj/ext_OpenCL.NATIVE.o obj/shared.NATIVE.o obj/rp_kernel_on_cpu.NATIVE.o obj/interface.NATIVE.o 
+NATIVE_OBJS              := obj/terminal.NATIVE.o obj/logfile.NATIVE.o obj/data.NATIVE.o obj/convert.NATIVE.o obj/memory.NATIVE.o obj/logging.NATIVE.o obj/cpu_aes.NATIVE.o obj/cpu_des.NATIVE.o obj/cpu_md5.NATIVE.o obj/cpu_sha1.NATIVE.o obj/cpu_sha256.NATIVE.o obj/bitops.NATIVE.o obj/bitops.NATIVE.o obj/ext_OpenCL.NATIVE.o obj/shared.NATIVE.o obj/rp_kernel_on_cpu.NATIVE.o obj/interface.NATIVE.o 
 
 ifeq ($(UNAME),Linux)
 NATIVE_OBJS              += obj/ext_ADL.NATIVE.o
@@ -174,8 +174,8 @@ NATIVE_OBJS              += obj/ext_nvml.NATIVE.o
 NATIVE_OBJS              += obj/ext_xnvctrl.NATIVE.o
 endif
 
-LINUX_32_OBJS            := obj/logfile.LINUX.32.o obj/data.LINUX.32.o obj/convert.LINUX.32.o obj/memory.LINUX.32.o obj/logging.LINUX.32.o obj/cpu_aes.LINUX.32.o obj/cpu_des.LINUX.32.o obj/cpu_md5.LINUX.32.o obj/cpu_sha1.LINUX.32.o obj/cpu_sha256.LINUX.32.o obj/bitops.LINUX.32.o obj/ext_OpenCL.LINUX.32.o obj/shared.LINUX.32.o obj/rp_kernel_on_cpu.LINUX.32.o obj/ext_ADL.LINUX.32.o obj/ext_nvml.LINUX.32.o obj/ext_nvapi.LINUX.32.o obj/ext_xnvctrl.LINUX.32.o obj/interface.LINUX.32.o
-LINUX_64_OBJS            := obj/logfile.LINUX.64.o obj/data.LINUX.64.o obj/convert.LINUX.64.o obj/memory.LINUX.64.o obj/logging.LINUX.64.o obj/cpu_aes.LINUX.64.o obj/cpu_des.LINUX.64.o obj/cpu_md5.LINUX.64.o obj/cpu_sha1.LINUX.64.o obj/cpu_sha256.LINUX.64.o obj/bitops.LINUX.64.o obj/ext_OpenCL.LINUX.64.o obj/shared.LINUX.64.o obj/rp_kernel_on_cpu.LINUX.64.o obj/ext_ADL.LINUX.64.o obj/ext_nvml.LINUX.64.o obj/ext_nvapi.LINUX.64.o obj/ext_xnvctrl.LINUX.64.o obj/interface.LINUX.64.o
+LINUX_32_OBJS            := obj/terminal.LINUX.32.o obj/logfile.LINUX.32.o obj/data.LINUX.32.o obj/convert.LINUX.32.o obj/memory.LINUX.32.o obj/logging.LINUX.32.o obj/cpu_aes.LINUX.32.o obj/cpu_des.LINUX.32.o obj/cpu_md5.LINUX.32.o obj/cpu_sha1.LINUX.32.o obj/cpu_sha256.LINUX.32.o obj/bitops.LINUX.32.o obj/ext_OpenCL.LINUX.32.o obj/shared.LINUX.32.o obj/rp_kernel_on_cpu.LINUX.32.o obj/ext_ADL.LINUX.32.o obj/ext_nvml.LINUX.32.o obj/ext_nvapi.LINUX.32.o obj/ext_xnvctrl.LINUX.32.o obj/interface.LINUX.32.o
+LINUX_64_OBJS            := obj/terminal.LINUX.64.o obj/logfile.LINUX.64.o obj/data.LINUX.64.o obj/convert.LINUX.64.o obj/memory.LINUX.64.o obj/logging.LINUX.64.o obj/cpu_aes.LINUX.64.o obj/cpu_des.LINUX.64.o obj/cpu_md5.LINUX.64.o obj/cpu_sha1.LINUX.64.o obj/cpu_sha256.LINUX.64.o obj/bitops.LINUX.64.o obj/ext_OpenCL.LINUX.64.o obj/shared.LINUX.64.o obj/rp_kernel_on_cpu.LINUX.64.o obj/ext_ADL.LINUX.64.o obj/ext_nvml.LINUX.64.o obj/ext_nvapi.LINUX.64.o obj/ext_xnvctrl.LINUX.64.o obj/interface.LINUX.64.o
 
 # Windows CRT file globbing:
 
@@ -185,8 +185,8 @@ CRT_GLOB_INCLUDE_FOLDER  := $(dir $(lastword $(MAKEFILE_LIST)))
 
 include $(CRT_GLOB_INCLUDE_FOLDER)/win_file_globbing.mk
 
-WIN_32_OBJS              := obj/logfile.WIN.32.o obj/data.WIN.32.o obj/convert.WIN.32.o obj/memory.WIN.32.o obj/logging.WIN.32.o obj/cpu_aes.WIN.32.o obj/cpu_des.WIN.32.o obj/cpu_md5.WIN.32.o obj/cpu_sha1.WIN.32.o obj/cpu_sha256.WIN.32.o obj/bitops.WIN.32.o obj/ext_OpenCL.WIN.32.o obj/shared.WIN.32.o obj/rp_kernel_on_cpu.WIN.32.o obj/ext_ADL.WIN.32.o obj/ext_nvml.WIN.32.o obj/ext_nvapi.WIN.32.o obj/ext_xnvctrl.WIN.32.o obj/interface.WIN.32.o $(CRT_GLOB_32)
-WIN_64_OBJS              := obj/logfile.WIN.64.o obj/data.WIN.64.o obj/convert.WIN.64.o obj/memory.WIN.64.o obj/logging.WIN.64.o obj/cpu_aes.WIN.64.o obj/cpu_des.WIN.64.o obj/cpu_md5.WIN.64.o obj/cpu_sha1.WIN.64.o obj/cpu_sha256.WIN.64.o obj/bitops.WIN.64.o obj/ext_OpenCL.WIN.64.o obj/shared.WIN.64.o obj/rp_kernel_on_cpu.WIN.64.o obj/ext_ADL.WIN.64.o obj/ext_nvml.WIN.64.o obj/ext_nvapi.WIN.64.o obj/ext_xnvctrl.WIN.64.o obj/interface.WIN.64.o $(CRT_GLOB_64)
+WIN_32_OBJS              := obj/terminal.WIN.32.o obj/logfile.WIN.32.o obj/data.WIN.32.o obj/convert.WIN.32.o obj/memory.WIN.32.o obj/logging.WIN.32.o obj/cpu_aes.WIN.32.o obj/cpu_des.WIN.32.o obj/cpu_md5.WIN.32.o obj/cpu_sha1.WIN.32.o obj/cpu_sha256.WIN.32.o obj/bitops.WIN.32.o obj/ext_OpenCL.WIN.32.o obj/shared.WIN.32.o obj/rp_kernel_on_cpu.WIN.32.o obj/ext_ADL.WIN.32.o obj/ext_nvml.WIN.32.o obj/ext_nvapi.WIN.32.o obj/ext_xnvctrl.WIN.32.o obj/interface.WIN.32.o $(CRT_GLOB_32)
+WIN_64_OBJS              := obj/terminal.WIN.64.o obj/logfile.WIN.64.o obj/data.WIN.64.o obj/convert.WIN.64.o obj/memory.WIN.64.o obj/logging.WIN.64.o obj/cpu_aes.WIN.64.o obj/cpu_des.WIN.64.o obj/cpu_md5.WIN.64.o obj/cpu_sha1.WIN.64.o obj/cpu_sha256.WIN.64.o obj/bitops.WIN.64.o obj/ext_OpenCL.WIN.64.o obj/shared.WIN.64.o obj/rp_kernel_on_cpu.WIN.64.o obj/ext_ADL.WIN.64.o obj/ext_nvml.WIN.64.o obj/ext_nvapi.WIN.64.o obj/ext_xnvctrl.WIN.64.o obj/interface.WIN.64.o $(CRT_GLOB_64)
 
 ##
 ## Targets: Global
diff --git a/src/logfile.c b/src/logfile.c
new file mode 100644
index 000000000..66906a432
--- /dev/null
+++ b/src/logfile.c
@@ -0,0 +1,92 @@
+/**
+ * Author......: Jens Steube <jens.steube@gmail.com>
+ * License.....: MIT
+ */
+
+#include "common.h"
+#include "types_int.h"
+#include "ext_OpenCL.h"
+#include "ext_ADL.h"
+#include "ext_nvapi.h"
+#include "ext_nvml.h"
+#include "ext_xnvctrl.h"
+#include "timer.h"
+#include "types.h"
+#include "memory.h"
+#include "data.h"
+#include "logfile.h"
+
+extern hc_global_data_t data;
+
+static FILE *logfile_open (char *logfile)
+{
+  FILE *fp = fopen (logfile, "ab");
+
+  if (fp == NULL)
+  {
+    fp = stdout;
+  }
+
+  return fp;
+}
+
+static void logfile_close (FILE *fp)
+{
+  if (fp == stdout) return;
+
+  fclose (fp);
+}
+
+void logfile_append (const char *fmt, ...)
+{
+  if (data.logfile_disable == 1) return;
+
+  FILE *fp = logfile_open (data.logfile);
+
+  va_list ap;
+
+  va_start (ap, fmt);
+
+  vfprintf (fp, fmt, ap);
+
+  va_end (ap);
+
+  fputc ('\n', fp);
+
+  fflush (fp);
+
+  logfile_close (fp);
+}
+
+static int logfile_generate_id ()
+{
+  const int n = rand ();
+
+  time_t t;
+
+  time (&t);
+
+  return t + n;
+}
+
+char *logfile_generate_topid ()
+{
+  const int id = logfile_generate_id ();
+
+  char *topid = (char *) mymalloc (1 + 16 + 1);
+
+  snprintf (topid, 1 + 16, "TOP%08x", id);
+
+  return topid;
+}
+
+char *logfile_generate_subid ()
+{
+  const int id = logfile_generate_id ();
+
+  char *subid = (char *) mymalloc (1 + 16 + 1);
+
+  snprintf (subid, 1 + 16, "SUB%08x", id);
+
+  return subid;
+}
diff --git a/src/shared.c b/src/shared.c
index 588101790..10fc84e74 100644
--- a/src/shared.c
+++ b/src/shared.c
@@ -20,176 +20,12 @@
 #include "timer.h"
 #include "types.h"
 #include "rp_cpu.h"
+#include "terminal.h"
 #include "data.h"
 #include "shared.h"
 
 extern hc_global_data_t data;
 
-/**
- * tty
- */
-
-#ifdef __linux__
-static struct termios savemodes;
-static int havemodes = 0;
-
-static int tty_break()
-{
-  struct termios modmodes;
-
-  if (tcgetattr (fileno (stdin), &savemodes) < 0) return -1;
-
-  havemodes = 1;
-
-  modmodes = savemodes;
-  modmodes.c_lflag &= ~ICANON;
-  modmodes.c_cc[VMIN] = 1;
-  modmodes.c_cc[VTIME] = 0;
-
-  return tcsetattr (fileno (stdin), TCSANOW, &modmodes);
-}
-
-static int tty_getchar()
-{
-  fd_set rfds;
-
-  FD_ZERO (&rfds);
-
-  FD_SET (fileno (stdin), &rfds);
-
-  struct timeval tv;
-
-  tv.tv_sec  = 1;
-  tv.tv_usec = 0;
-
-  int retval = select (1, &rfds, NULL, NULL, &tv);
-
-  if (retval ==  0) return  0;
-  if (retval == -1) return -1;
-
-  return getchar();
-}
-
-static int tty_fix()
-{
-  if (!havemodes) return 0;
-
-  return tcsetattr (fileno (stdin), TCSADRAIN, &savemodes);
-}
-#endif
-
-#if defined(__APPLE__) || defined(__FreeBSD__)
-static struct termios savemodes;
-static int havemodes = 0;
-
-int tty_break()
-{
-  struct termios modmodes;
-
-  if (ioctl (fileno (stdin), TIOCGETA, &savemodes) < 0) return -1;
-
-  havemodes = 1;
-
-  modmodes = savemodes;
-  modmodes.c_lflag &= ~ICANON;
-  modmodes.c_cc[VMIN] = 1;
-  modmodes.c_cc[VTIME] = 0;
-
-  return ioctl (fileno (stdin), TIOCSETAW, &modmodes);
-}
-
-int tty_getchar()
-{
-  fd_set rfds;
-
-  FD_ZERO (&rfds);
-
-  FD_SET (fileno (stdin), &rfds);
-
-  struct timeval tv;
-
-  tv.tv_sec  = 1;
-  tv.tv_usec = 0;
-
-  int retval = select (1, &rfds, NULL, NULL, &tv);
-
-  if (retval ==  0) return  0;
-  if (retval == -1) return -1;
-
-  return getchar();
-}
-
-int tty_fix()
-{
-  if (!havemodes) return 0;
-
-  return ioctl (fileno (stdin), TIOCSETAW, &savemodes);
-}
-#endif
-
-#ifdef WIN
-static DWORD saveMode = 0;
-
-static int tty_break()
-{
-  HANDLE stdinHandle = GetStdHandle (STD_INPUT_HANDLE);
-
-  GetConsoleMode (stdinHandle, &saveMode);
-  SetConsoleMode (stdinHandle, ENABLE_PROCESSED_INPUT);
-
-  return 0;
-}
-
-static int tty_getchar()
-{
-  HANDLE stdinHandle = GetStdHandle (STD_INPUT_HANDLE);
-
-  DWORD rc = WaitForSingleObject (stdinHandle, 1000);
-
-  if (rc == WAIT_TIMEOUT)   return  0;
-  if (rc == WAIT_ABANDONED) return -1;
-  if (rc == WAIT_FAILED)    return -1;
-
-  // The whole ReadConsoleInput () part is a workaround.
-  // For some unknown reason, maybe a mingw bug, a random signal
-  // is sent to stdin which unblocks WaitForSingleObject () and sets rc 0.
-  // Then it wants to read with getche () a keyboard input
-  // which has never been made.
-
-  INPUT_RECORD buf[100];
-
-  DWORD num = 0;
-
-  memset (buf, 0, sizeof (buf));
-
-  ReadConsoleInput (stdinHandle, buf, 100, &num);
-
-  FlushConsoleInputBuffer (stdinHandle);
-
-  for (uint i = 0; i < num; i++)
-  {
-    if (buf[i].EventType != KEY_EVENT) continue;
-
-    KEY_EVENT_RECORD KeyEvent = buf[i].Event.KeyEvent;
-
-    if (KeyEvent.bKeyDown != TRUE) continue;
-
-    return KeyEvent.uChar.AsciiChar;
-  }
-
-  return 0;
-}
-
-static int tty_fix()
-{
-  HANDLE stdinHandle = GetStdHandle (STD_INPUT_HANDLE);
-
-  SetConsoleMode (stdinHandle, saveMode);
-
-  return 0;
-}
-#endif
-
 /**
  * system
  */
diff --git a/src/terminal.c b/src/terminal.c
new file mode 100644
index 000000000..7a648741a
--- /dev/null
+++ b/src/terminal.c
@@ -0,0 +1,168 @@
+/**
+ * Author......: Jens Steube <jens.steube@gmail.com>
+ * License.....: MIT
+ */
+
+#include "common.h"
+#include "terminal.h"
+
+#ifdef __linux__
+static struct termios savemodes;
+static int havemodes = 0;
+
+int tty_break()
+{
+  struct termios modmodes;
+
+  if (tcgetattr (fileno (stdin), &savemodes) < 0) return -1;
+
+  havemodes = 1;
+
+  modmodes = savemodes;
+  modmodes.c_lflag &= ~ICANON;
+  modmodes.c_cc[VMIN] = 1;
+  modmodes.c_cc[VTIME] = 0;
+
+  return tcsetattr (fileno (stdin), TCSANOW, &modmodes);
+}
+
+int tty_getchar()
+{
+  fd_set rfds;
+
+  FD_ZERO (&rfds);
+
+  FD_SET (fileno (stdin), &rfds);
+
+  struct timeval tv;
+
+  tv.tv_sec  = 1;
+  tv.tv_usec = 0;
+
+  int retval = select (1, &rfds, NULL, NULL, &tv);
+
+  if (retval ==  0) return  0;
+  if (retval == -1) return -1;
+
+  return getchar();
+}
+
+int tty_fix()
+{
+  if (!havemodes) return 0;
+
+  return tcsetattr (fileno (stdin), TCSADRAIN, &savemodes);
+}
+#endif
+
+#if defined(__APPLE__) || defined(__FreeBSD__)
+static struct termios savemodes;
+static int havemodes = 0;
+
+int tty_break()
+{
+  struct termios modmodes;
+
+  if (ioctl (fileno (stdin), TIOCGETA, &savemodes) < 0) return -1;
+
+  havemodes = 1;
+
+  modmodes = savemodes;
+  modmodes.c_lflag &= ~ICANON;
+  modmodes.c_cc[VMIN] = 1;
+  modmodes.c_cc[VTIME] = 0;
+
+  return ioctl (fileno (stdin), TIOCSETAW, &modmodes);
+}
+
+int tty_getchar()
+{
+  fd_set rfds;
+
+  FD_ZERO (&rfds);
+
+  FD_SET (fileno (stdin), &rfds);
+
+  struct timeval tv;
+
+  tv.tv_sec  = 1;
+  tv.tv_usec = 0;
+
+  int retval = select (1, &rfds, NULL, NULL, &tv);
+
+  if (retval ==  0) return  0;
+  if (retval == -1) return -1;
+
+  return getchar();
+}
+
+int tty_fix()
+{
+  if (!havemodes) return 0;
+
+  return ioctl (fileno (stdin), TIOCSETAW, &savemodes);
+}
+#endif
+
+#ifdef WIN
+static DWORD saveMode = 0;
+
+int tty_break()
+{
+  HANDLE stdinHandle = GetStdHandle (STD_INPUT_HANDLE);
+
+  GetConsoleMode (stdinHandle, &saveMode);
+  SetConsoleMode (stdinHandle, ENABLE_PROCESSED_INPUT);
+
+  return 0;
+}
+
+int tty_getchar()
+{
+  HANDLE stdinHandle = GetStdHandle (STD_INPUT_HANDLE);
+
+  DWORD rc = WaitForSingleObject (stdinHandle, 1000);
+
+  if (rc == WAIT_TIMEOUT)   return  0;
+  if (rc == WAIT_ABANDONED) return -1;
+  if (rc == WAIT_FAILED)    return -1;
+
+  // The whole ReadConsoleInput () part is a workaround.
+  // For some unknown reason, maybe a mingw bug, a random signal
+  // is sent to stdin which unblocks WaitForSingleObject () and sets rc 0.
+  // Then it wants to read with getche () a keyboard input
+  // which has never been made.
+
+  INPUT_RECORD buf[100];
+
+  DWORD num = 0;
+
+  memset (buf, 0, sizeof (buf));
+
+  ReadConsoleInput (stdinHandle, buf, 100, &num);
+
+  FlushConsoleInputBuffer (stdinHandle);
+
+  for (DWORD i = 0; i < num; i++)
+  {
+    if (buf[i].EventType != KEY_EVENT) continue;
+
+    KEY_EVENT_RECORD KeyEvent = buf[i].Event.KeyEvent;
+
+    if (KeyEvent.bKeyDown != TRUE) continue;
+
+    return KeyEvent.uChar.AsciiChar;
+  }
+
+  return 0;
+}
+
+int tty_fix()
+{
+  HANDLE stdinHandle = GetStdHandle (STD_INPUT_HANDLE);
+
+  SetConsoleMode (stdinHandle, saveMode);
+
+  return 0;
+}
+#endif