diff options
Diffstat (limited to 'src/Mayaqua/Tracking.c')
| -rw-r--r-- | src/Mayaqua/Tracking.c | 975 |
1 files changed, 975 insertions, 0 deletions
diff --git a/src/Mayaqua/Tracking.c b/src/Mayaqua/Tracking.c new file mode 100644 index 00000000..55bb9284 --- /dev/null +++ b/src/Mayaqua/Tracking.c @@ -0,0 +1,975 @@ +// SoftEther VPN Source Code
+// Mayaqua Kernel
+//
+// SoftEther VPN Server, Client and Bridge are free software under GPLv2.
+//
+// Copyright (c) 2012-2014 Daiyuu Nobori.
+// Copyright (c) 2012-2014 SoftEther VPN Project, University of Tsukuba, Japan.
+// Copyright (c) 2012-2014 SoftEther Corporation.
+//
+// All Rights Reserved.
+//
+// http://www.softether.org/
+//
+// Author: Daiyuu Nobori
+// Comments: Tetsuo Sugiyama, Ph.D.
+//
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// version 2 as published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License version 2
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+// THE LICENSE AGREEMENT IS ATTACHED ON THE SOURCE-CODE PACKAGE
+// AS "LICENSE.TXT" FILE. READ THE TEXT FILE IN ADVANCE TO USE THE SOFTWARE.
+//
+//
+// THIS SOFTWARE IS DEVELOPED IN JAPAN, AND DISTRIBUTED FROM JAPAN,
+// UNDER JAPANESE LAWS. YOU MUST AGREE IN ADVANCE TO USE, COPY, MODIFY,
+// MERGE, PUBLISH, DISTRIBUTE, SUBLICENSE, AND/OR SELL COPIES OF THIS
+// SOFTWARE, THAT ANY JURIDICAL DISPUTES WHICH ARE CONCERNED TO THIS
+// SOFTWARE OR ITS CONTENTS, AGAINST US (SOFTETHER PROJECT, SOFTETHER
+// CORPORATION, DAIYUU NOBORI OR OTHER SUPPLIERS), OR ANY JURIDICAL
+// DISPUTES AGAINST US WHICH ARE CAUSED BY ANY KIND OF USING, COPYING,
+// MODIFYING, MERGING, PUBLISHING, DISTRIBUTING, SUBLICENSING, AND/OR
+// SELLING COPIES OF THIS SOFTWARE SHALL BE REGARDED AS BE CONSTRUED AND
+// CONTROLLED BY JAPANESE LAWS, AND YOU MUST FURTHER CONSENT TO
+// EXCLUSIVE JURISDICTION AND VENUE IN THE COURTS SITTING IN TOKYO,
+// JAPAN. YOU MUST WAIVE ALL DEFENSES OF LACK OF PERSONAL JURISDICTION
+// AND FORUM NON CONVENIENS. PROCESS MAY BE SERVED ON EITHER PARTY IN
+// THE MANNER AUTHORIZED BY APPLICABLE LAW OR COURT RULE.
+//
+// USE ONLY IN JAPAN. DO NOT USE IT IN OTHER COUNTRIES. IMPORTING THIS
+// SOFTWARE INTO OTHER COUNTRIES IS AT YOUR OWN RISK. SOME COUNTRIES
+// PROHIBIT ENCRYPTED COMMUNICATIONS. USING THIS SOFTWARE IN OTHER
+// COUNTRIES MIGHT BE RESTRICTED.
+//
+//
+// DEAR SECURITY EXPERTS
+// ---------------------
+//
+// If you find a bug or a security vulnerability please kindly inform us
+// about the problem immediately so that we can fix the security problem
+// to protect a lot of users around the world as soon as possible.
+//
+// Our e-mail address for security reports is:
+// softether-vpn-security [at] softether.org
+//
+// Please note that the above e-mail address is not a technical support
+// inquiry address. If you need technical assistance, please visit
+// http://www.softether.org/ and ask your question on the users forum.
+//
+// Thank you for your cooperation.
+
+
+// Tracking.c
+// Object tracking module
+
+#include <GlobalConst.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+#include <stdarg.h>
+#include <time.h>
+#include <errno.h>
+#include <Mayaqua/Mayaqua.h>
+
+// Global variables
+static LOCK *obj_lock;
+static LOCK *obj_id_lock;
+static UINT obj_id;
+static LOCK *cs_lock;
+static bool disable_tracking = false;
+static TRACKING_LIST **hashlist;
+
+static bool do_not_get_callstack;
+
+// Enable the tracking
+void TrackingEnable()
+{
+ disable_tracking = false;
+}
+
+// Disable the tracking
+void TrackingDisable()
+{
+ disable_tracking = true;
+}
+
+// Get whether the tracking is enabled
+bool IsTrackingEnabled()
+{
+ return !disable_tracking;
+}
+
+// Memory debug menu
+void MemoryDebugMenu()
+{
+ char tmp[MAX_SIZE];
+ TOKEN_LIST *t;
+ char *cmd;
+ Print("Mayaqua Kernel Memory Debug Tools\n"
+ "Copyright (c) SoftEther Corporation. All Rights Reserved.\n\n");
+ g_memcheck = false;
+ while (true)
+ {
+ Print("debug>");
+ GetLine(tmp, sizeof(tmp));
+ t = ParseToken(tmp, " \t");
+ if (t->NumTokens == 0)
+ {
+ FreeToken(t);
+ DebugPrintAllObjects();
+ continue;
+ }
+ cmd = t->Token[0];
+ if (!StrCmpi(cmd, "?"))
+ {
+ DebugPrintCommandList();
+ }
+ else if (!StrCmpi(cmd, "a"))
+ {
+ DebugPrintAllObjects();
+ }
+ else if (!StrCmpi(cmd, "i"))
+ {
+ if (t->NumTokens == 1)
+ {
+ Print("Usage: i <obj_id>\n\n");
+ }
+ else
+ {
+ DebugPrintObjectInfo(ToInt(t->Token[1]));
+ }
+ }
+ else if (!StrCmpi(cmd, "q"))
+ {
+ break;
+ }
+ else if (ToInt(cmd) != 0)
+ {
+ DebugPrintObjectInfo(ToInt(t->Token[0]));
+ }
+ else
+ {
+ Print("Command Not Found,\n\n");
+ }
+ FreeToken(t);
+ }
+ FreeToken(t);
+ g_memcheck = true;
+}
+
+// Sort the objects by chronological order
+int SortObjectView(void *p1, void *p2)
+{
+ TRACKING_OBJECT *o1, *o2;
+ if (p1 == NULL || p2 == NULL)
+ {
+ return 0;
+ }
+ o1 = *(TRACKING_OBJECT **)p1;
+ o2 = *(TRACKING_OBJECT **)p2;
+ if (o1 == NULL || o2 == NULL)
+ {
+ return 0;
+ }
+
+ if (o1->Id > o2->Id)
+ {
+ return 1;
+ }
+ else if (o1->Id == o2->Id)
+ {
+ return 0;
+ }
+ return -1;
+}
+
+// Display the information of the object
+void PrintObjectInfo(TRACKING_OBJECT *o)
+{
+ SYSTEMTIME t;
+ char tmp[MAX_SIZE];
+ // Validate arguments
+ if (o == NULL)
+ {
+ return;
+ }
+
+ UINT64ToSystem(&t, o->CreatedDate);
+ GetDateTimeStrMilli(tmp, sizeof(tmp), &t);
+
+ Print(" TRACKING_OBJECT ID: %u\n"
+ " TRACKING_OBJECT TYPE: %s\n"
+ " ADDRESS: 0x%p\n"
+ " TRACKING_OBJECT SIZE: %u bytes\n"
+ " CREATED DATE: %s\n",
+ o->Id, o->Name, UINT64_TO_POINTER(o->Address), o->Size, tmp);
+
+ PrintCallStack(o->CallStack);
+}
+
+// Display the object information
+void DebugPrintObjectInfo(UINT id)
+{
+ UINT i;
+ TRACKING_OBJECT *o;
+
+ // Search
+ o = NULL;
+ LockTrackingList();
+ {
+ for (i = 0;i < TRACKING_NUM_ARRAY;i++)
+ {
+ if (hashlist[i] != NULL)
+ {
+ TRACKING_LIST *t = hashlist[i];
+
+ while (true)
+ {
+ if (t->Object->Id == id)
+ {
+ o = t->Object;
+ break;
+ }
+
+ if (t->Next == NULL)
+ {
+ break;
+ }
+
+ t = t->Next;
+ }
+
+ if (o != NULL)
+ {
+ break;
+ }
+ }
+ }
+ }
+ UnlockTrackingList();
+
+ if (o == NULL)
+ {
+ // The ID could not be found
+ Print("obj_id %u Not Found.\n\n", id);
+ return;
+ }
+
+ PrintObjectInfo(o);
+ Print("\n");
+}
+
+// Show a Summary of the object
+void PrintObjectList(TRACKING_OBJECT *o)
+{
+ char tmp[MAX_SIZE];
+ SYSTEMTIME t;
+ UINT64ToSystem(&t, o->CreatedDate);
+ GetTimeStrMilli(tmp, sizeof(tmp), &t);
+ TrackGetObjSymbolInfo(o);
+ Print("%-4u - [%-6s] %s 0x%p size=%-5u %11s %u\n",
+ o->Id, o->Name, tmp, UINT64_TO_POINTER(o->Address), o->Size, o->FileName, o->LineNumber);
+}
+
+// Display all the objects
+void DebugPrintAllObjects()
+{
+ UINT i;
+ LIST *view;
+
+ // Creating a List
+ view = NewListFast(SortObjectView);
+ LockTrackingList();
+ {
+ for (i = 0;i < TRACKING_NUM_ARRAY;i++)
+ {
+ if (hashlist[i] != NULL)
+ {
+ TRACKING_LIST *t = hashlist[i];
+
+ while (true)
+ {
+ Add(view, t->Object);
+
+ if (t->Next == NULL)
+ {
+ break;
+ }
+
+ t = t->Next;
+ }
+ }
+ }
+ }
+ UnlockTrackingList();
+
+ // Sort
+ Sort(view);
+
+ // Drawing
+ for (i = 0;i < LIST_NUM(view);i++)
+ {
+ TRACKING_OBJECT *o = (TRACKING_OBJECT *)LIST_DATA(view, i);
+ PrintObjectList(o);
+ }
+
+ // Release the list
+ ReleaseList(view);
+
+ Print("\n");
+}
+
+// List of the commands
+void DebugPrintCommandList()
+{
+ Print(
+ "a - All Objects\n"
+ "i - Object Information\n"
+ "? - Help\n"
+ "q - Quit\n\n"
+ );
+}
+
+// Display the usage of the memory
+void PrintMemoryStatus()
+{
+ MEMORY_STATUS s;
+ GetMemoryStatus(&s);
+ Print("MEMORY STATUS:\n"
+ " NUM_OF_MEMORY_BLOCKS: %u\n"
+ " SIZE_OF_TOTAL_MEMORY: %u bytes\n",
+ s.MemoryBlocksNum, s.MemorySize);
+}
+
+// Get the using state of the memory
+void GetMemoryStatus(MEMORY_STATUS *status)
+{
+ UINT i, num, size;
+ // Validate arguments
+ if (status == NULL)
+ {
+ return;
+ }
+
+ LockTrackingList();
+ {
+ size = num = 0;
+
+ for (i = 0;i < TRACKING_NUM_ARRAY;i++)
+ {
+ if (hashlist[i] != NULL)
+ {
+ TRACKING_LIST *t = hashlist[i];
+
+ while (true)
+ {
+ TRACKING_OBJECT *o = t->Object;
+
+ if (StrCmpi(o->Name, "MEM") == 0)
+ {
+ num++;
+ size += o->Size;
+ }
+
+ if (t->Next == NULL)
+ {
+ break;
+ }
+
+ t = t->Next;
+ }
+ }
+ }
+ }
+ UnlockTrackingList();
+
+ status->MemoryBlocksNum = num;
+ status->MemorySize = size;
+}
+
+// Get the symbol information by the object
+void TrackGetObjSymbolInfo(TRACKING_OBJECT *o)
+{
+ // Validate arguments
+ if (o == NULL)
+ {
+ return;
+ }
+
+ if (!(o->LineNumber == 0 && o->FileName[0] == 0))
+ {
+ return;
+ }
+
+ if (o->CallStack != NULL)
+ {
+ GetCallStackSymbolInfo(o->CallStack);
+ if (StrLen(o->CallStack->filename) != 0 && o->CallStack->line != 0)
+ {
+ StrCpy(o->FileName, sizeof(o->FileName), o->CallStack->filename);
+ o->LineNumber = o->CallStack->line;
+ }
+ }
+}
+
+// Put a new object into the tracking list
+void TrackNewObj(UINT64 addr, char *name, UINT size)
+{
+ TRACKING_OBJECT *o;
+ UINT new_id;
+ // Validate arguments
+ if (addr == 0 || name == NULL)
+ {
+ return;
+ }
+
+ if (IsMemCheck() == false)
+ {
+ // Don't track in the release mode
+ return;
+ }
+
+ if (disable_tracking)
+ {
+ return;
+ }
+
+ // Generate a new ID
+ OSLock(obj_id_lock);
+ {
+ new_id = ++obj_id;
+ }
+ OSUnlock(obj_id_lock);
+
+ o = OSMemoryAlloc(sizeof(TRACKING_OBJECT));
+ o->Id = new_id;
+ o->Address = addr;
+ o->Name = name;
+ o->Size = size;
+ o->CreatedDate = LocalTime64();
+ o->CallStack = WalkDownCallStack(GetCallStack(), 2);
+
+ o->FileName[0] = 0;
+ o->LineNumber = 0;
+
+ LockTrackingList();
+ {
+ InsertTrackingList(o);
+ }
+ UnlockTrackingList();
+}
+
+// Remove the object from the tracking list
+void TrackDeleteObj(UINT64 addr)
+{
+ TRACKING_OBJECT *o;
+ // Validate arguments
+ if (addr == 0)
+ {
+ return;
+ }
+
+ if (IsMemCheck() == false)
+ {
+ // Don't track in the release mode
+ return;
+ }
+
+ if (disable_tracking)
+ {
+ return;
+ }
+
+ LockTrackingList();
+ {
+ o = SearchTrackingList(addr);
+ if (o == NULL)
+ {
+ UnlockTrackingList();
+
+ if (IsDebug())
+ {
+ printf("TrackDeleteObj: 0x%x is not Object!!\n", (void *)addr);
+ }
+ return;
+ }
+ DeleteTrackingList(o, true);
+ }
+ UnlockTrackingList();
+}
+
+// Change the size of the object being tracked
+void TrackChangeObjSize(UINT64 addr, UINT size, UINT64 new_addr)
+{
+ TRACKING_OBJECT *o;
+ // Validate arguments
+ if (addr == 0)
+ {
+ return;
+ }
+
+ if (IsMemCheck() == false)
+ {
+ // Don't track in the release mode
+ return;
+ }
+
+ if (disable_tracking)
+ {
+ return;
+ }
+
+ LockTrackingList();
+ {
+ o = SearchTrackingList(addr);
+ if (o == NULL)
+ {
+ UnlockTrackingList();
+ return;
+ }
+
+ DeleteTrackingList(o, false);
+
+ o->Size = size;
+ o->Address = new_addr;
+
+ InsertTrackingList(o);
+ }
+ UnlockTrackingList();
+}
+
+// Memory address comparison function
+int CompareTrackingObject(const void *p1, const void *p2)
+{
+ TRACKING_OBJECT *o1, *o2;
+ // Validate arguments
+ if (p1 == NULL || p2 == NULL)
+ {
+ return 0;
+ }
+ o1 = *(TRACKING_OBJECT **)p1;
+ o2 = *(TRACKING_OBJECT **)p2;
+ if (o1 == NULL || o2 == NULL)
+ {
+ return 0;
+ }
+
+ if (o1->Address > o2->Address)
+ {
+ return 1;
+ }
+ if (o1->Address == o2->Address)
+ {
+ return 0;
+ }
+ return -1;
+}
+
+// Search an object in the tracking list
+TRACKING_OBJECT *SearchTrackingList(UINT64 Address)
+{
+ UINT i;
+ // Validate arguments
+ if (Address == 0)
+ {
+ return NULL;
+ }
+
+ i = TRACKING_HASH(Address);
+
+ if (hashlist[i] != NULL)
+ {
+ TRACKING_LIST *tt = hashlist[i];
+
+ while (true)
+ {
+ if (tt->Object->Address == Address)
+ {
+ return tt->Object;
+ }
+
+ tt = tt->Next;
+
+ if (tt == NULL)
+ {
+ break;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+// Remove an object from a tracking list
+void DeleteTrackingList(TRACKING_OBJECT *o, bool free_object_memory)
+{
+ UINT i;
+ // Validate arguments
+ if (o == NULL)
+ {
+ return;
+ }
+
+ i = TRACKING_HASH(o->Address);
+
+ if (hashlist[i] != NULL)
+ {
+ TRACKING_LIST *ft = NULL;
+
+ if (hashlist[i]->Object == o)
+ {
+ ft = hashlist[i];
+ hashlist[i] = hashlist[i]->Next;
+ }
+ else
+ {
+ TRACKING_LIST *tt = hashlist[i];
+ TRACKING_LIST *prev = NULL;
+
+ while (true)
+ {
+ if (tt->Object == o)
+ {
+ prev->Next = tt->Next;
+ ft = tt;
+ break;
+ }
+
+ if (tt->Next == NULL)
+ {
+ break;
+ }
+
+ prev = tt;
+ tt = tt->Next;
+ }
+ }
+
+ if (ft != NULL)
+ {
+ OSMemoryFree(ft);
+
+ if (free_object_memory)
+ {
+ FreeCallStack(o->CallStack);
+ OSMemoryFree(o);
+ }
+ }
+ }
+}
+
+// Insert an object into the tracking list
+void InsertTrackingList(TRACKING_OBJECT *o)
+{
+ UINT i;
+ TRACKING_LIST *t;
+ // Validate arguments
+ if (o == NULL)
+ {
+ return;
+ }
+
+ t = OSMemoryAlloc(sizeof(TRACKING_LIST));
+ t->Object = o;
+ t->Next = NULL;
+
+ i = TRACKING_HASH(o->Address);
+
+ if (hashlist[i] == NULL)
+ {
+ hashlist[i] = t;
+ }
+ else
+ {
+ TRACKING_LIST *tt = hashlist[i];
+ while (true)
+ {
+ if (tt->Next == NULL)
+ {
+ tt->Next = t;
+ break;
+ }
+
+ tt = tt->Next;
+ }
+ }
+}
+
+// Lock the tracking list
+void LockTrackingList()
+{
+ OSLock(obj_lock);
+}
+
+// Unlock the tracking list
+void UnlockTrackingList()
+{
+ OSUnlock(obj_lock);
+}
+
+// Initialize the tracking
+void InitTracking()
+{
+ UINT i;
+ CALLSTACK_DATA *s;
+
+ // Hash list initialization
+ hashlist = (TRACKING_LIST **)OSMemoryAlloc(sizeof(TRACKING_LIST *) * TRACKING_NUM_ARRAY);
+
+ for (i = 0;i < TRACKING_NUM_ARRAY;i++)
+ {
+ hashlist[i] = NULL;
+ }
+
+ obj_id = 0;
+
+ // Create a lock
+ obj_lock = OSNewLock();
+ obj_id_lock = OSNewLock();
+ cs_lock = OSNewLock();
+
+ s = GetCallStack();
+ if (s == NULL)
+ {
+ do_not_get_callstack = true;
+ }
+ else
+ {
+ do_not_get_callstack = false;
+ FreeCallStack(s);
+ }
+}
+
+// Release the tracking
+void FreeTracking()
+{
+ UINT i;
+ // Delete the lock
+ OSDeleteLock(obj_lock);
+ OSDeleteLock(obj_id_lock);
+ OSDeleteLock(cs_lock);
+ cs_lock = NULL;
+ obj_id_lock = NULL;
+ obj_lock = NULL;
+
+ // Release all of the elements
+ for (i = 0;i < TRACKING_NUM_ARRAY;i++)
+ {
+ if (hashlist[i] != NULL)
+ {
+ TRACKING_LIST *t = hashlist[i];
+
+ while (true)
+ {
+ TRACKING_LIST *t2 = t;
+ TRACKING_OBJECT *o = t->Object;
+
+ FreeCallStack(o->CallStack);
+ OSMemoryFree(o);
+
+ t = t->Next;
+
+ OSMemoryFree(t2);
+
+ if (t == NULL)
+ {
+ break;
+ }
+ }
+ }
+ }
+
+ // Release the list
+ OSMemoryFree(hashlist);
+}
+
+// Show the call stack
+void PrintCallStack(CALLSTACK_DATA *s)
+{
+ char tmp[MAX_SIZE * 2];
+
+ GetCallStackStr(tmp, sizeof(tmp), s);
+ Print("%s", tmp);
+}
+
+// Convert the call stack to a string
+void GetCallStackStr(char *str, UINT size, CALLSTACK_DATA *s)
+{
+ char tmp[MAX_SIZE];
+ char tmp2[MAX_SIZE];
+ char tmp3[MAX_SIZE];
+ UINT num, i;
+ // Validate arguments
+ if (str == NULL)
+ {
+ return;
+ }
+
+ if (s == NULL)
+ {
+ StrCpy(str, size, "(Unknown)\n");
+ }
+ else
+ {
+ num = 0;
+ str[0] = 0;
+ while (true)
+ {
+ if (s == NULL)
+ {
+ break;
+ }
+
+ GetCallStackSymbolInfo(s);
+
+ if (s->name == NULL)
+ {
+ Format(tmp, sizeof(tmp), "0x%p ---", UINT64_TO_POINTER(s->offset));
+ }
+ else
+ {
+ Format(tmp, sizeof(tmp), "0x%p %s() + 0x%02x",
+ (void *)s->offset, s->name, UINT64_TO_POINTER(s->disp));
+ }
+ for (i = 0;i < num;i++)
+ {
+ tmp2[i] = ' ';
+ }
+ tmp2[i] = '\0';
+ StrCpy(tmp3, sizeof(tmp3), tmp2);
+ StrCat(tmp3, sizeof(tmp3), tmp);
+ Format(tmp, sizeof(tmp), "%-55s %11s %u\n", tmp3, s->filename, s->line);
+ StrCat(str, size, tmp);
+ num++;
+ s = s->next;
+ }
+ }
+}
+
+// Get the current call stack
+CALLSTACK_DATA *GetCallStack()
+{
+ CALLSTACK_DATA *s;
+ if (do_not_get_callstack)
+ {
+ // Not to get the call stack
+ return NULL;
+ }
+
+ OSLock(cs_lock);
+ {
+ // Get the call stack
+ s = OSGetCallStack();
+ }
+ OSUnlock(cs_lock);
+ if (s == NULL)
+ {
+ return NULL;
+ }
+
+ // Descend in the call stack for 3 steps
+ s = WalkDownCallStack(s, 3);
+
+ return s;
+}
+
+// Get the symbol information of the call stack
+bool GetCallStackSymbolInfo(CALLSTACK_DATA *s)
+{
+ bool ret;
+ // Validate arguments
+ if (s == NULL)
+ {
+ return false;
+ }
+
+ OSLock(cs_lock);
+ {
+ ret = OSGetCallStackSymbolInfo(s);
+ }
+ OSUnlock(cs_lock);
+
+ return ret;
+}
+
+// Descend in the call stack by a specified number
+CALLSTACK_DATA *WalkDownCallStack(CALLSTACK_DATA *s, UINT num)
+{
+ CALLSTACK_DATA *cs, *tmp;
+ UINT i;
+ // Validate arguments
+ if (s == NULL)
+ {
+ return NULL;
+ }
+
+ cs = s;
+ i = 0;
+
+ while (true)
+ {
+ if (i >= num)
+ {
+ return cs;
+ }
+ i++;
+ tmp = cs;
+ cs = tmp->next;
+ OSMemoryFree(tmp->name);
+ OSMemoryFree(tmp);
+
+ if (cs == NULL)
+ {
+ return NULL;
+ }
+ }
+}
+
+// Release the call stack
+void FreeCallStack(CALLSTACK_DATA *s)
+{
+ // Validate arguments
+ if (s == NULL)
+ {
+ return;
+ }
+
+ while (true)
+ {
+ CALLSTACK_DATA *next = s->next;
+ OSMemoryFree(s->name);
+ OSMemoryFree(s);
+ if (next == NULL)
+ {
+ break;
+ }
+ s = next;
+ }
+}
+
+
+
+// Developed by SoftEther VPN Project at University of Tsukuba in Japan.
+// Department of Computer Science has dozens of overly-enthusiastic geeks.
+// Join us: http://www.tsukuba.ac.jp/english/admission/
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