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gecko-sdk/include/prtrace.h

+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Netscape Portable Runtime (NSPR).
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998-2000
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef prtrace_h___
+#define prtrace_h___
+/*
+** prtrace.h -- NSPR's Trace Facility.                             
+**                                                                                         
+** The Trace Facility provides a means to trace application                                        
+** program events within a process. When implementing an                                   
+** application program an engineer may insert a "Trace" function                           
+** call, passing arguments to be traced. The "Trace" function                              
+** combines the user trace data with identifying data and                                  
+** writes this data in time ordered sequence into a circular                               
+** in-memory buffer; when the buffer fills, it wraps.
+**                                                                                         
+** Functions are provided to set and/or re-configure the size of                           
+** the trace buffer, control what events are recorded in the                               
+** buffer, enable and disable tracing based on specific user                               
+** supplied data and other control functions. Methods are provided                         
+** to record the trace entries in the in-memory trace buffer to
+** a file.
+**                                                                                         
+** Tracing may cause a performance degredation to the application                          
+** depending on the number and placement of calls to the tracing                           
+** facility. When tracing is compiled in and all tracing is                                        
+** disabled via the runtime controls, the overhead should be                               
+** minimal. ... Famous last words, eh?                                                                             
+**                                                                                                                                                 
+** When DEBUG is defined at compile time, the Trace Facility is                    
+** compiled as part of NSPR and any application using NSPR's                       
+** header files will have tracing compiled in. When DEBUG is not                   
+** defined, the Trace Facility is not compiled into NSPR nor                       
+** exported in its header files.  If the Trace Facility is                         
+** desired in a non-debug build, then FORCE_NSPR_TRACE may be                      
+** defined at compile time for both the optimized build of NSPR                    
+** and the application. NSPR and any application using  NSPR's                     
+** Trace Facility must be compiled with the same level of trace                    
+** conditioning or unresolved references may be realized at link                   
+** time.                                                                           
+**                                                                                 
+** For any of the Trace Facility methods that requires a trace                     
+** handle as an input argument, the caller must ensure that the                    
+** trace handle argument is valid. An invalid trace handle                         
+** argument may cause unpredictable results.                                       
+**                                                                                 
+** Trace Facility methods are thread-safe and SMP safe.                            
+**                                                                                 
+** Users of the Trace Facility should use the defined macros to                     
+** invoke trace methods, not the function calls directly. e.g.                      
+** PR_TRACE( h1,0,1,2, ...); not PR_Trace(h1,0,1,2, ...);
+**                                                                                  
+** Application designers should be aware of the effects of
+** debug and optimized build differences when using result of the
+** Trace Facility macros in expressions.
+** 
+** See Also: prcountr.h                                                                                 
+**                                                                                  
+** /lth. 08-Jun-1998.                                                                                  
+*/
+
+#include "prtypes.h"
+#include "prthread.h"
+#include "prtime.h"
+
+PR_BEGIN_EXTERN_C
+
+/*
+** Opaque type for the trace handle 
+** ... Don't even think about looking in here.
+**
+*/
+typedef void *  PRTraceHandle;
+
+/*
+** PRTraceEntry -- A trace entry in the in-memory trace buffer
+** looks like this.
+**
+*/
+typedef struct PRTraceEntry
+{
+    PRThread        *thread;        /* The thread creating the trace entry */
+    PRTraceHandle   handle;         /* PRTraceHandle creating the trace entry */
+    PRTime          time;           /* Value of PR_Now() at time of trace entry */
+    PRUint32        userData[8];    /* user supplied trace data */
+} PRTraceEntry;
+
+/*
+** PRTraceOption -- command operands to
+** PR_[Set|Get]TraceOption(). See descriptive meanings there.
+**
+*/
+typedef enum PRTraceOption
+{
+    PRTraceBufSize,
+    PRTraceEnable,              
+    PRTraceDisable,
+    PRTraceSuspend,
+    PRTraceResume,
+    PRTraceSuspendRecording,
+    PRTraceResumeRecording,
+    PRTraceLockHandles,
+    PRTraceUnLockHandles,
+    PRTraceStopRecording
+} PRTraceOption;
+
+/* -----------------------------------------------------------------------
+** FUNCTION: PR_DEFINE_TRACE() -- Define a PRTraceHandle
+** 
+** DESCRIPTION: PR_DEFINE_TRACE() is used to define a trace
+** handle.
+** 
+*/
+#define PR_DEFINE_TRACE(name) PRTraceHandle name
+
+/* -----------------------------------------------------------------------
+** FUNCTION: PR_INIT_TRACE_HANDLE() -- Set the value of a PRTraceHandle
+** 
+** DESCRIPTION: 
+** PR_INIT_TRACE_HANDLE() sets the value of a PRTraceHandle
+** to value. e.g. PR_INIT_TRACE_HANDLE( myHandle, NULL );
+** 
+*/
+#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
+#define PR_INIT_TRACE_HANDLE(handle,value)\
+    (handle) = (PRCounterHandle)(value)
+#else
+#define PR_INIT_TRACE_HANDLE(handle,value)
+#endif
+
+
+/* -----------------------------------------------------------------------
+** FUNCTION: PR_CreateTrace() -- Create a trace handle
+** 
+** DESCRIPTION:
+**  PR_CreateTrace() creates a new trace handle. Tracing is
+**  enabled for this handle when it is created. The trace handle
+**  is intended for use in other Trace Facility calls.
+**  
+**  PR_CreateTrace() registers the QName, RName and description
+**  data so that this data can be retrieved later.
+** 
+** INPUTS: 
+**  qName: pointer to string. QName for this trace handle. 
+** 
+**  rName: pointer to string. RName for this trace handle. 
+** 
+**  description: pointer to string. Descriptive data about this
+**  trace handle.
+**
+** OUTPUTS:
+**  Creates the trace handle. 
+**  Registers the QName and RName with the trace facility.
+** 
+** RETURNS: 
+**  PRTraceHandle
+** 
+** RESTRICTIONS:
+**  qName is limited to 31 characters.
+**  rName is limited to 31 characters.
+**  description is limited to 255 characters.
+** 
+*/
+#define PRTRACE_NAME_MAX 31
+#define PRTRACE_DESC_MAX 255
+
+#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
+#define PR_CREATE_TRACE(handle,qName,rName,description)\
+    (handle) = PR_CreateTrace((qName),(rName),(description))
+#else
+#define PR_CREATE_TRACE(handle,qName,rName,description)
+#endif
+
+NSPR_API(PRTraceHandle)
+        PR_CreateTrace( 
+        const char *qName,          /* QName for this trace handle */
+            const char *rName,          /* RName for this trace handle */
+            const char *description     /* description for this trace handle */
+);
+
+
+/* -----------------------------------------------------------------------
+** FUNCTION: PR_DestroyTrace() -- Destroy a trace handle
+** 
+** DESCRIPTION: 
+**  PR_DestroyTrace() removes the referenced trace handle and
+** associated QName, RName and description data from the Trace
+** Facility.
+** 
+** INPUTS: handle. A PRTraceHandle
+** 
+** OUTPUTS: 
+**  The trace handle is unregistered.
+**  The QName, RName and description are removed.
+** 
+** RETURNS: void
+** 
+** RESTRICTIONS:
+** 
+*/
+#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
+#define PR_DESTROY_TRACE(handle)\
+    PR_DestroyTrace((handle))
+#else
+#define PR_DESTROY_TRACE(handle)
+#endif
+
+NSPR_API(void) 
+        PR_DestroyTrace( 
+                PRTraceHandle handle    /* Handle to be destroyed */
+);
+
+
+/* -----------------------------------------------------------------------
+** FUNCTION: PR_Trace() -- Make a trace entry in the in-memory trace
+** 
+** DESCRIPTION:
+** PR_Trace() makes an entry in the in-memory trace buffer for
+** the referenced trace handle. The next logically available
+** PRTraceEntry is used; when the next trace entry would overflow
+** the trace table, the table wraps.
+**
+** PR_Trace() for a specific trace handle may be disabled by
+** calling PR_SetTraceOption() specifying PRTraceDisable for the
+** trace handle to be disabled.
+** 
+** INPUTS:
+** handle: PRTraceHandle. The trace handle for this trace.
+** 
+** userData[0..7]: unsigned 32bit integers. user supplied data
+** that is copied into the PRTraceEntry
+** 
+** OUTPUTS:
+**  A PRTraceEntry is (conditionally) formatted in the in-memory
+** trace buffer.
+** 
+** RETURNS: void.
+** 
+** RESTRICTIONS:
+** 
+*/
+#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
+#define PR_TRACE(handle,ud0,ud1,ud2,ud3,ud4,ud5,ud6,ud7)\
+    PR_Trace((handle),(ud0),(ud1),(ud2),(ud3),(ud4),(ud5),(ud6),(ud7))
+#else
+#define PR_TRACE(handle,ud0,ud1,ud2,ud3,ud4,ud5,ud6,ud7)
+#endif
+
+NSPR_API(void) 
+        PR_Trace( 
+        PRTraceHandle handle,       /* use this trace handle */
+            PRUint32    userData0,      /* User supplied data word 0 */
+            PRUint32    userData1,      /* User supplied data word 1 */
+            PRUint32    userData2,      /* User supplied data word 2 */
+            PRUint32    userData3,      /* User supplied data word 3 */
+            PRUint32    userData4,      /* User supplied data word 4 */
+            PRUint32    userData5,      /* User supplied data word 5 */
+            PRUint32    userData6,      /* User supplied data word 6 */
+            PRUint32    userData7       /* User supplied data word 7 */
+);
+
+/* -----------------------------------------------------------------------
+** FUNCTION: PR_SetTraceOption() -- Control the Trace Facility
+** 
+** DESCRIPTION:
+** PR_SetTraceOption() controls the Trace Facility. Depending on
+** command and value, attributes of the Trace Facility may be
+** changed.
+** 
+** INPUTS:
+**  command: An enumerated value in the set of PRTraceOption.
+**  value: pointer to the data to be set. Type of the data is
+**  dependent on command; for each value of command, the type
+**  and meaning of dereferenced value is shown.
+**
+**  PRTraceBufSize: unsigned long: the size of the trace buffer,
+** in bytes.
+** 
+**  PRTraceEnable: PRTraceHandle. The trace handle to be
+** enabled.
+** 
+**  PRTraceDisable: PRTraceHandle. The trace handle to be
+** disabled.
+** 
+**  PRTraceSuspend: void. value must be NULL. All tracing is
+** suspended.
+** 
+**  PRTraceResume: void. value must be NULL. Tracing for all
+** previously enabled, prior to a PRTraceSuspend, is resumed.
+** 
+**  PRTraceStopRecording: void. value must be NULL. If recording
+** (see: ** PR_RecordTraceEntries()) is being done, 
+** PRTraceStopRecording causes PR_RecordTraceEntries() to return
+** to its caller. If recording is not being done, this function
+** has no effect.
+** 
+**  PRTraceSuspendRecording: void. Must be NULL. If recording is
+** being done, PRTraceSuspendRecording causes further writes to
+** the trace file to be suspended. Data in the in-memory
+** trace buffer that would ordinarily be written to the
+** trace file will not be written. Trace entries will continue
+** to be entered in the in-memory buffer. If the Trace Facility
+** recording is already in a suspended state, the call has no
+** effect.
+** 
+**  PRTraceResumeRecording: void. value must be NULL. If
+** recording for the Trace Facility has been previously been
+** suspended, this causes recording to resume. Recording resumes
+** with the next in-memory buffer segment that would be written
+** if trace recording had not been suspended. If recording is
+** not currently suspended, the call has no effect.
+** 
+**  PRTraceLockHandles: void. value must be NULL. Locks the
+** trace handle lock. While the trace handle lock is held,
+** calls to PR_CreateTrace() will block until the lock is
+** released.
+** 
+**  PRTraceUnlockHandles: void. value must be NULL. Unlocks the
+** trace handle lock.
+** 
+** OUTPUTS:
+**  The operation of the Trace Facility may be changed.
+** 
+** RETURNS: void
+** 
+** RESTRICTIONS:
+** 
+*/
+#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
+#define PR_SET_TRACE_OPTION(command,value)\
+    PR_SetTraceOption((command),(value))
+#else
+#define PR_SET_TRACE_OPTION(command,value)
+#endif
+
+NSPR_API(void) 
+        PR_SetTraceOption( 
+            PRTraceOption command,  /* One of the enumerated values */
+            void *value             /* command value or NULL */
+);
+
+
+/* -----------------------------------------------------------------------
+** FUNCTION: PR_GetTraceOption() -- Retrieve settings from the Trace Facility
+** 
+** DESCRIPTION:
+** PR_GetTraceOption() retrieves the current setting of the
+** Trace Facility control depending on command.
+** 
+** 
+**  PRTraceBufSize: unsigned long: the size of the trace buffer,
+** in bytes.
+** 
+** 
+** INPUTS:
+**  command: one of the enumerated values in PRTraceOptions
+** valid for PR_GetTraceOption().
+** 
+** OUTPUTS:
+**  dependent on command.
+** 
+** RETURNS: void
+** 
+** RESTRICTIONS:
+** 
+*/
+#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
+#define PR_GET_TRACE_OPTION(command,value)\
+    PR_GetTraceOption((command),(value))
+#else
+#define PR_GET_TRACE_OPTION(command,value)
+#endif
+
+NSPR_API(void) 
+        PR_GetTraceOption( 
+        PRTraceOption command,  /* One of the enumerated values */
+            void *value             /* command value or NULL */
+);
+
+/* -----------------------------------------------------------------------
+** FUNCTION: PR_GetTraceHandleFromName() -- Retrieve an existing
+** handle by name.
+** 
+** DESCRIPTION:
+** PR_GetTraceHandleFromName() retreives an existing tracehandle
+** using the name specified by qName and rName.
+** 
+** INPUTS:
+**  qName: pointer to string. QName for this trace handle. 
+** 
+**  rName: pointer to string. RName for this trace handle. 
+** 
+** 
+** OUTPUTS: returned.
+** 
+** RETURNS: 
+**  PRTraceHandle associated with qName and rName or NULL when
+** there is no match.
+** 
+** RESTRICTIONS:
+** 
+*/
+#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
+#define PR_GET_TRACE_HANDLE_FROM_NAME(handle,qName,rName)\
+    (handle) = PR_GetTraceHandleFromName((qName),(rName))
+#else
+#define PR_GET_TRACE_HANDLE_FROM_NAME(handle,qName,rName)
+#endif
+
+NSPR_API(PRTraceHandle) 
+        PR_GetTraceHandleFromName( 
+        const char *qName,      /* QName search argument */
+        const char *rName       /* RName search argument */
+);
+
+/* -----------------------------------------------------------------------
+** FUNCTION: PR_GetTraceNameFromHandle() -- Retreive trace name
+** by bandle.
+** 
+** DESCRIPTION:
+** PR_GetTraceNameFromHandle() retreives the existing qName,
+** rName, and description for the referenced trace handle.
+** 
+** INPUTS: handle: PRTraceHandle.
+** 
+** OUTPUTS: pointers to the Trace Facility's copy of qName,
+** rName and description. ... Don't mess with these values.
+** They're mine.
+** 
+** RETURNS: void
+** 
+** RESTRICTIONS:
+** 
+*/
+#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
+#define PR_GET_TRACE_NAME_FROM_HANDLE(handle,qName,rName,description)\
+    PR_GetTraceNameFromHandle((handle),(qName),(rName),(description))
+#else
+#define PR_GET_TRACE_NAME_FROM_HANDLE(handle,qName,rName,description)
+#endif
+
+NSPR_API(void) 
+        PR_GetTraceNameFromHandle( 
+        PRTraceHandle handle,       /* handle as search argument */
+            const char **qName,         /* pointer to associated QName */
+            const char **rName,         /* pointer to associated RName */
+        const char **description    /* pointer to associated description */
+);
+
+/* -----------------------------------------------------------------------
+** FUNCTION: PR_FindNextTraceQname() -- Retrieive a QName handle
+** iterator.
+** 
+** DESCRIPTION:
+** PR_FindNextTraceQname() retreives the first or next trace
+** QName handle, depending on the value of handle, from the trace
+** database. The PRTraceHandle returned can be used as an
+** iterator to traverse the QName handles in the Trace database.
+** 
+** INPUTS:
+**  handle: When NULL, PR_FindNextQname() returns the first QName
+** handle. When a handle is a valid PRTraceHandle previously
+** retreived using PR_FindNextQname() the next QName handle is
+** retreived.
+** 
+** OUTPUTS: returned.
+** 
+** RETURNS: 
+**  PRTraceHandle or NULL when there are no trace handles.
+** 
+** RESTRICTIONS:
+**  Iterating thru the trace handles via FindFirst/FindNext
+** should be done under protection of the trace handle lock.
+** See: PR_SetTraceOption( PRLockTraceHandles ).
+** 
+*/
+#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
+#define PR_FIND_NEXT_TRACE_QNAME(next,handle)\
+    (next) = PR_FindNextTraceQname((handle))
+#else
+#define PR_FIND_NEXT_TRACE_QNAME(next,handle)
+#endif
+
+NSPR_API(PRTraceHandle) 
+        PR_FindNextTraceQname( 
+        PRTraceHandle handle
+);
+
+
+/* -----------------------------------------------------------------------
+** FUNCTION: PR_FindNextTraceRname() -- Retrieive an RName handle
+** iterator.
+** 
+** DESCRIPTION:
+** PR_FindNextTraceRname() retreives the first or next trace
+** RName handle, depending on the value of handle, from the trace
+** database. The PRTraceHandle returned can be used as an
+** iterator to traverse the RName handles in the Trace database.
+** 
+** INPUTS:
+**  rhandle: When NULL, PR_FindNextRname() returns the first
+** RName handle. When a handle is a valid PRTraceHandle
+** previously retreived using PR_FindNextRname() the next RName
+** handle is retreived.
+**  qhandle: A valid PRTraceHandle retruned from a previous call
+** to PR_FIND_NEXT_TRACE_QNAME().
+** 
+** OUTPUTS: returned.
+** 
+** RETURNS: 
+**  PRTraceHandle or NULL when there are no trace handles.
+** 
+** RESTRICTIONS:
+**  Iterating thru the trace handles via FindNext should be done
+** under protection of the trace handle lock. See: (
+** PR_SetTraceOption( PRLockTraceHandles ).
+** 
+*/
+#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
+#define PR_FIND_NEXT_TRACE_RNAME(next,rhandle,qhandle)\
+    (next) = PR_FindNextTraceRname((rhandle),(qhandle))
+#else
+#define PR_FIND_NEXT_TRACE_RNAME(next,rhandle,qhandle)
+#endif
+
+NSPR_API(PRTraceHandle) 
+        PR_FindNextTraceRname( 
+        PRTraceHandle rhandle,
+        PRTraceHandle qhandle
+);
+
+/* -----------------------------------------------------------------------
+** FUNCTION: PR_RecordTraceEntries() -- Write trace entries to external media
+** 
+** DESCRIPTION:
+** PR_RecordTraceEntries() causes entries in the in-memory trace
+** buffer to be written to external media.
+**
+** When PR_RecordTraceEntries() is called from an application
+** thread, the function appears to block until another thread
+** calls PR_SetTraceOption() with the PRTraceStopRecording
+** option. This suggests that PR_RecordTraceEntries() should be
+** called from a user supplied thread whose only job is to
+** record trace entries. 
+** 
+** The environment variable NSPR_TRACE_LOG controls the operation
+** of this function. When NSPR_TRACE_LOG is not defined in the
+** environment, no recording of trace entries occurs. When
+** NSPR_TRACE_LOG is defined, the value of its definition must be
+** the filename of the file to receive the trace entry buffer.
+**
+** PR_RecordTraceEntries() attempts to record the in-memory
+** buffer to a file, subject to the setting of the environment
+** variable NSPR_TRACE_LOG. It is possible because of system
+** load, the thread priority of the recording thread, number of
+** active trace records being written over time, and other
+** variables that some trace records can be lost. ... In other
+** words: don't bet the farm on getting everything.
+** 
+** INPUTS: none
+** 
+** OUTPUTS: none
+** 
+** RETURNS: PR_STATUS
+**    PR_SUCCESS no errors were found.
+**    PR_FAILURE errors were found.
+** 
+** RESTRICTIONS:
+** Only one thread can call PR_RecordTraceEntries() within a
+** process.
+** 
+** On error, PR_RecordTraceEntries() may return prematurely.
+** 
+*/
+#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
+#define PR_RECORD_TRACE_ENTRIES()\
+        PR_RecordTraceEntries()
+#else
+#define PR_RECORD_TRACE_ENTRIES()
+#endif
+    
+NSPR_API(void)
+        PR_RecordTraceEntries(
+        void 
+);
+
+/* -----------------------------------------------------------------------
+** FUNCTION: PR_GetTraceEntries() -- Retreive trace entries from
+** the Trace Facility
+** 
+** DESCRIPTION:
+** PR_GetTraceEntries() retreives trace entries from the Trace
+** Facility. Up to count trace entries are copied from the Trace
+** Facility into buffer. Only those trace entries that have not
+** been copied via a previous call to PR_GetTraceEntries() are
+** copied. The actual number copied is placed in the PRInt32
+** variable pointed to by found.
+**
+** If more than count trace entries have entered the Trace
+** Facility since the last call to PR_GetTraceEntries() 
+** a lost data condition is returned. In this case, the most
+** recent count trace entries are copied into buffer and found is
+** set to count.
+** 
+** INPUTS:
+**  count. The number of trace entries to be copied into buffer.
+** 
+** 
+** OUTPUTS:
+**  buffer. An array of PRTraceEntries. The buffer is supplied
+** by the caller.
+** 
+** found: 32bit signed integer. The number of PRTraceEntries
+** actually copied. found is always less than or equal to count.
+** 
+** RETURNS: 
+**  zero when there is no lost data.
+**  non-zero when some PRTraceEntries have been lost.
+** 
+** RESTRICTIONS:
+** This is a real performance pig. The copy out operation is bad
+** enough, but depending on then frequency of calls to the
+** function, serious performance impact to the operating
+** application may be realized. ... YMMV.
+** 
+*/
+#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
+#define PR_GET_TRACE_ENTRIES(buffer,count,found)\
+        PR_GetTraceEntries((buffer),(count),(found))
+#else
+#define PR_GET_TRACE_ENTRIES(buffer,count,found)
+#endif
+
+NSPR_API(PRIntn)
+    PR_GetTraceEntries(
+        PRTraceEntry    *buffer,    /* where to write output */
+        PRInt32         count,      /* number to get */
+        PRInt32         *found      /* number you got */
+);
+
+PR_END_EXTERN_C
+
+#endif /* prtrace_h___ */
+