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wincache_fcnotify.c
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/*
+----------------------------------------------------------------------------------------------+
| Windows Cache for PHP |
+----------------------------------------------------------------------------------------------+
| Copyright (c) 2009, Microsoft Corporation. All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without modification, are |
| permitted provided that the following conditions are met: |
| - Redistributions of source code must retain the above copyright notice, this list of |
| conditions and the following disclaimer. |
| - Redistributions in binary form must reproduce the above copyright notice, this list of |
| conditions and the following disclaimer in the documentation and/or other materials provided |
| with the distribution. |
| - Neither the name of the Microsoft Corporation nor the names of its contributors may be |
| used to endorse or promote products derived from this software without specific prior written|
| permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS |
| OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE|
| GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| OF THE POSSIBILITY OF SUCH DAMAGE. |
+----------------------------------------------------------------------------------------------+
| Module: wincache_fcnotify.c |
+----------------------------------------------------------------------------------------------+
| Author: Kanwaljeet Singla <[email protected]> |
+----------------------------------------------------------------------------------------------+
*/
#define _WIN32_WINNT 0x0500
#include "precomp.h"
#define PROCESS_IS_ALIVE 0
#define PROCESS_IS_DEAD 1
#define FCNOTIFY_VALUE(p, o) ((fcnotify_value *)alloc_get_cachevalue(p, o))
#define FCNOTIFY_TERMKEY ((ULONG_PTR)-1)
#define SCAVENGER_FREQUENCY 900000
#define PALIVECHK_FREQUENCY 1000
static unsigned int WINAPI change_notification_thread(void * parg);
static void WINAPI process_change_notification(fcnotify_context * pnotify, fcnotify_listen * plistener, unsigned int dwerror, unsigned int bytecount);
static int findfolder_in_cache(fcnotify_context * pnotify, const char * folderpath, unsigned int index, fcnotify_value ** ppvalue);
static void unregister_directory_changes(fcnotify_listen * plistener);
static unsigned int register_directory_changes(fcnotify_context * pnotify, fcnotify_listen * plistener);
static int create_fcnotify_data(fcnotify_context * pnotify, const char * folderpath, fcnotify_value ** ppvalue);
static void listener_refinc(fcnotify_listen * plistener);
static void listener_refdec(fcnotify_context * pnotify, fcnotify_listen * plistener);
static void destroy_fcnotify_data(fcnotify_context * pnotify, fcnotify_value * pvalue);
static void add_fcnotify_entry(fcnotify_context * pnotify, unsigned int index, fcnotify_value * pvalue);
static void remove_fcnotify_entry(fcnotify_context * pnotify, unsigned int index, fcnotify_value * pvalue);
static int pidhandles_apply(void * pdestination TSRMLS_DC);
static void run_fcnotify_scavenger(fcnotify_context * pnotify);
static unsigned char process_alive_check(fcnotify_context * pnotify, fcnotify_value * pvalue);
static unsigned int WINAPI change_notification_thread(void * parg)
{
fcnotify_context * pnotify = NULL;
fcnotify_listen * plistener = NULL;
zend_bool retvalue = 0;
unsigned int dwerror = 0;
unsigned int bytecount = 0;
ULONG_PTR compkey = 0;
OVERLAPPED * poverlap = NULL;
pnotify = (fcnotify_context *)parg;
while(1)
{
compkey = 0;
bytecount = 0;
poverlap = NULL;
/* Get completion port message. Ok to listen infinitely */
/* as terminate is going to send termination key */
retvalue = GetQueuedCompletionStatus(pnotify->port_handle, &bytecount, &compkey, &poverlap, INFINITE);
/* process change notification if success and key is non termination key */
dwerror = (retvalue ? ERROR_SUCCESS : GetLastError());
if(compkey == FCNOTIFY_TERMKEY)
{
break;
}
else if(poverlap != NULL)
{
plistener = CONTAINING_RECORD(poverlap, fcnotify_listen, overlapped);
_ASSERT(plistener != NULL);
listener_refinc(plistener);
process_change_notification(pnotify, plistener, dwerror, bytecount);
listener_refdec(pnotify, plistener);
}
}
return ERROR_SUCCESS;
}
static void WINAPI process_change_notification(fcnotify_context * pnotify, fcnotify_listen * plistener, unsigned int dwerror, unsigned int bytecount)
{
HRESULT hr = S_OK;
int result = NONFATAL;
FILE_NOTIFY_INFORMATION * pnitem = NULL;
FILE_NOTIFY_INFORMATION * pnnext = NULL;
wchar_t * pwchar = NULL;
char * pfname = NULL;
unsigned int fnlength = 0;
dprintverbose("start process_change_notification");
_ASSERT(plistener != NULL);
/* Async IO completed. Update refcount to reflect that */
listener_refdec(pnotify, plistener);
if(plistener->stopcalled)
{
goto Finished;
}
if(bytecount == 0)
{
if(dwerror == ERROR_ACCESS_DENIED)
{
/* Unregister change notification and set plistener to NULL to */
/* make system set a new change notification system if required */
lock_writelock(pnotify->fclock);
unregister_directory_changes(plistener);
plistener->pfcnvalue->plistener = NULL;
lock_writeunlock(pnotify->fclock);
}
goto Finished;
}
else
{
pnnext = (FILE_NOTIFY_INFORMATION *)plistener->fninfo;
while(pnnext != NULL)
{
pnitem = pnnext;
pnnext = (FILE_NOTIFY_INFORMATION *)((char *)pnitem + pnitem->NextEntryOffset);
fnlength = pnitem->FileNameLength / 2;
pwchar = (wchar_t *)alloc_pemalloc((fnlength + 1) * sizeof(wchar_t));
pfname = (char *)alloc_pemalloc(fnlength + 1);
if(pwchar == NULL || pfname == NULL)
{
hr = E_OUTOFMEMORY;
goto Finished;
}
ZeroMemory(pwchar, (fnlength + 1) * sizeof(wchar_t));
wcsncpy(pwchar, pnitem->FileName, fnlength);
ZeroMemory(pfname, fnlength + 1);
if(!WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, pwchar, fnlength, pfname, fnlength, NULL, NULL))
{
hr = GetLastError();
goto Finished;
}
dprintverbose("received change notification for file = %s\\%s", plistener->folder_path, pfname);
aplist_mark_changed(pnotify->fcaplist, plistener->folder_path, pfname);
alloc_pefree(pwchar);
pwchar = NULL;
alloc_pefree(pfname);
pfname = NULL;
if(pnitem == pnnext)
{
break;
}
}
/* register for change notification again */
/* If bytecount was 0, no need to register again */
register_directory_changes(pnotify, plistener);
}
Finished:
if(pwchar != NULL)
{
alloc_pefree(pwchar);
pwchar = NULL;
}
if(pfname != NULL)
{
alloc_pefree(pfname);
pfname = NULL;
}
dprintverbose("end process_change_notification");
return;
}
static int findfolder_in_cache(fcnotify_context * pnotify, const char * folderpath, unsigned int index, fcnotify_value ** ppvalue)
{
int result = NONFATAL;
fcnotify_header * pheader = NULL;
fcnotify_value * pvalue = NULL;
dprintverbose("start findfolder_in_cache");
_ASSERT(pnotify != NULL);
_ASSERT(folderpath != NULL);
_ASSERT(ppvalue != NULL);
*ppvalue = NULL;
pheader = pnotify->fcheader;
pvalue = FCNOTIFY_VALUE(pnotify->fcalloc, pheader->values[index]);
while(pvalue != NULL)
{
if(!_stricmp(pnotify->fcmemaddr + pvalue->folder_path, folderpath))
{
*ppvalue = pvalue;
break;
}
pvalue = FCNOTIFY_VALUE(pnotify->fcalloc, pvalue->next_value);
}
dprintverbose("end findfolder_in_cache");
return result;
}
static void unregister_directory_changes(fcnotify_listen * plistener)
{
InterlockedExchange(&plistener->stopcalled, 1);
if(plistener->folder_handle != INVALID_HANDLE_VALUE)
{
CloseHandle(plistener->folder_handle);
plistener->folder_handle = INVALID_HANDLE_VALUE;
}
}
static unsigned int register_directory_changes(fcnotify_context * pnotify, fcnotify_listen * plistener)
{
unsigned int cflags = 0;
unsigned int bytecount = 0;
unsigned int result = 0;
_ASSERT(plistener != NULL);
_ASSERT(plistener->pfcnvalue != NULL);
_ASSERT(plistener->folder_handle != INVALID_HANDLE_VALUE);
memset(&plistener->overlapped, 0, sizeof(OVERLAPPED));
listener_refinc(plistener);
/* file name, last write, attributes and security change should be delivered */
cflags = FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_LAST_WRITE | FILE_NOTIFY_CHANGE_ATTRIBUTES | FILE_NOTIFY_CHANGE_SECURITY;
result = ReadDirectoryChangesW(plistener->folder_handle, &plistener->fninfo, 1024, FALSE, cflags, &bytecount, &plistener->overlapped, NULL);
if(!result)
{
listener_refdec(pnotify, plistener);
}
return result;
}
/* This method will either create a new entry altogether or modify an existing entry */
static int create_fcnotify_data(fcnotify_context * pnotify, const char * folderpath, fcnotify_value ** ppvalue)
{
int result = NONFATAL;
fcnotify_value * pvalue = NULL;
alloc_context * palloc = NULL;
unsigned int pathlen = 0;
char * paddr = NULL;
unsigned int fshare = 0;
unsigned int flags = 0;
unsigned int rdcresult = 0;
fcnotify_listen * plistener = NULL;
dprintverbose("start create_fcnotify_data");
_ASSERT(pnotify != NULL);
_ASSERT(folderpath != NULL);
_ASSERT(ppvalue != NULL);
palloc = pnotify->fcalloc;
pathlen = strlen(folderpath);
/* Allocate memory only if its not already allocated */
if(*ppvalue == NULL)
{
pvalue = (fcnotify_value *)alloc_smalloc(palloc, sizeof(fcnotify_value) + ALIGNDWORD(pathlen + 1));
if(pvalue == NULL)
{
result = FATAL_OUT_OF_SMEMORY;
goto Finished;
}
/* Set these to 0 only if a new structure is created */
pvalue->reusecount = 0;
pvalue->folder_path = 0;
pvalue->refcount = 0;
pvalue->prev_value = 0;
pvalue->next_value = 0;
/* Set folderpath only if memory is just allocated */
paddr = (char *)(pvalue + 1);
memcpy_s(paddr, pathlen, folderpath, pathlen);
*(paddr + pathlen) = 0;
pvalue->folder_path = ((char *)paddr) - pnotify->fcmemaddr;
}
else
{
pvalue = *ppvalue;
}
pvalue->owner_pid = pnotify->processid;
pvalue->palivechk = GetTickCount();
pvalue->plistener = NULL;
pvalue->listen_time.dwHighDateTime = 0;
pvalue->listen_time.dwLowDateTime = 0;
/* Allocate memory for listener locally */
plistener = (fcnotify_listen *)alloc_pemalloc(sizeof(fcnotify_listen));
if(plistener == NULL)
{
result = FATAL_OUT_OF_LMEMORY;
goto Finished;
}
ZeroMemory(plistener, sizeof(fcnotify_listen));
/* Set initial refcount and pointer to fcnotify_value */
plistener->lrefcount = 0;
plistener->pfcnvalue = pvalue;
/* Open folder_path and attach it to completion port */
fshare = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
flags = FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED;
plistener->folder_handle = CreateFile(folderpath, FILE_LIST_DIRECTORY, fshare, NULL, OPEN_EXISTING, flags, NULL);
if(plistener->folder_handle == INVALID_HANDLE_VALUE)
{
result = FATAL_FCNOTIFY_CREATEFILE;
goto Finished;
}
plistener->folder_path = alloc_pestrdup(folderpath);
if(CreateIoCompletionPort(plistener->folder_handle, pnotify->port_handle, (ULONG_PTR)0, 0) == NULL)
{
result = FATAL_FCNOTIFY_COMPPORT;
goto Finished;
}
rdcresult = register_directory_changes(pnotify, plistener);
if(!rdcresult)
{
result = FATAL_FCNOTIFY_RDCFAILURE;
goto Finished;
}
pvalue->plistener = plistener;
plistener = NULL;
/* Update the time when the listener was set */
GetSystemTimeAsFileTime(&pvalue->listen_time);
pvalue->reusecount++;
*ppvalue = pvalue;
Finished:
if(FAILED(result))
{
dprintimportant("failure %d in create_fcnotify_data", result);
if(pvalue != NULL)
{
if(pvalue->plistener != NULL)
{
if(pvalue->plistener->folder_path != NULL)
{
alloc_pefree(pvalue->plistener->folder_path);
pvalue->plistener->folder_path = NULL;
}
if(pvalue->plistener->folder_handle != INVALID_HANDLE_VALUE)
{
CloseHandle(pvalue->plistener->folder_handle);
pvalue->plistener->folder_handle = INVALID_HANDLE_VALUE;
}
alloc_pefree(pvalue->plistener);
pvalue->plistener = NULL;
}
alloc_sfree(palloc, pvalue);
pvalue = NULL;
}
}
dprintverbose("end create_fcnotify_data");
return result;
}
__inline
static void listener_refinc(fcnotify_listen * plistener)
{
InterlockedIncrement(&plistener->lrefcount);
}
__inline
static void listener_refdec(fcnotify_context * pnotify, fcnotify_listen * plistener)
{
if(InterlockedDecrement(&plistener->lrefcount) == 0)
{
lock_writelock(pnotify->fclock);
unregister_directory_changes(plistener);
if(plistener->folder_path != NULL)
{
alloc_pefree(plistener->folder_path);
plistener->folder_path = NULL;
}
/*
* Set listener to null to rehook change notification if this folder is
* re-added before scavenger run
*/
plistener->pfcnvalue->plistener = NULL;
alloc_pefree(plistener);
plistener = NULL;
lock_writeunlock(pnotify->fclock);
}
}
static void destroy_fcnotify_data(fcnotify_context * pnotify, fcnotify_value * pvalue)
{
dprintverbose("start destroy_fcnotify_data");
if(pvalue != NULL)
{
/* Free memory occupied by plistener and close the handle */
/* if owner process is destroying fcnotify data */
/* Detect recycled ownerpid by comparing process times with listen_time */
FILETIME ftpstart, ftpexit, ftpkernel, ftpuser;
if((pnotify->processid == pvalue->owner_pid) &&
(pvalue->plistener != NULL) &&
(GetProcessTimes(GetCurrentProcess(), &ftpstart, &ftpexit, &ftpkernel, &ftpuser) != 0) &&
(ftpstart.dwHighDateTime <= pvalue->listen_time.dwHighDateTime && ftpstart.dwLowDateTime <= pvalue->listen_time.dwLowDateTime))
{
/* Just close the directory handle */
/* Change notification will make refcount 0 and free memory */
if(pvalue->plistener != NULL && pvalue->plistener->folder_handle != INVALID_HANDLE_VALUE)
{
CloseHandle(pvalue->plistener->folder_handle);
pvalue->plistener->folder_handle = INVALID_HANDLE_VALUE;
}
pvalue->plistener = NULL;
}
else
{
/* Process which owned memory is probably gone and ownerpid is recycled */
pvalue->plistener = NULL;
}
alloc_sfree(pnotify->fcalloc, pvalue);
pvalue = NULL;
}
dprintverbose("end destroy_fcnotify_data");
}
static void add_fcnotify_entry(fcnotify_context * pnotify, unsigned int index, fcnotify_value * pvalue)
{
fcnotify_header * fcheader = NULL;
fcnotify_value * pcheck = NULL;
dprintverbose("start add_fcnotify_entry");
_ASSERT(pnotify != NULL);
_ASSERT(pvalue != NULL);
_ASSERT(pvalue->folder_path != 0);
fcheader = pnotify->fcheader;
pcheck = FCNOTIFY_VALUE(pnotify->fcalloc, fcheader->values[index]);
while(pcheck != NULL)
{
if(pcheck->next_value == 0)
{
break;
}
pcheck = FCNOTIFY_VALUE(pnotify->fcalloc, pcheck->next_value);
}
if(pcheck != NULL)
{
pcheck->next_value = alloc_get_valueoffset(pnotify->fcalloc, pvalue);
pvalue->next_value = 0;
pvalue->prev_value = alloc_get_valueoffset(pnotify->fcalloc, pcheck);
}
else
{
fcheader->values[index] = alloc_get_valueoffset(pnotify->fcalloc, pvalue);
pvalue->next_value = 0;
pvalue->prev_value = 0;
}
fcheader->itemcount++;
dprintverbose("end add_fcnotify_entry");
return;
}
static void remove_fcnotify_entry(fcnotify_context * pnotify, unsigned int index, fcnotify_value * pvalue)
{
alloc_context * palloc = NULL;
fcnotify_header * header = NULL;
fcnotify_value * ptemp = NULL;
dprintverbose("start remove_fcnotify_entry");
_ASSERT(pnotify != NULL);
_ASSERT(pvalue != NULL);
_ASSERT(pvalue->folder_path != 0);
header = pnotify->fcheader;
palloc = pnotify->fcalloc;
header->itemcount--;
if(pvalue->prev_value == 0)
{
header->values[index] = pvalue->next_value;
if(pvalue->next_value != 0)
{
ptemp = FCNOTIFY_VALUE(palloc, pvalue->next_value);
if (ptemp != NULL)
{
ptemp->prev_value = 0;
}
}
}
else
{
ptemp = FCNOTIFY_VALUE(palloc, pvalue->prev_value);
if (ptemp != NULL)
{
ptemp->next_value = pvalue->next_value;
}
if(pvalue->next_value != 0)
{
ptemp = FCNOTIFY_VALUE(palloc, pvalue->next_value);
if (ptemp != NULL)
{
ptemp->prev_value = pvalue->prev_value;
}
}
}
destroy_fcnotify_data(pnotify, pvalue);
pvalue = NULL;
dprintverbose("end remove_fcnotify_entry");
return;
}
/* Public functions */
int fcnotify_create(fcnotify_context ** ppnotify)
{
int result = NONFATAL;
fcnotify_context * pcontext = NULL;
dprintverbose("start fcnotify_create");
_ASSERT(ppnotify != NULL);
*ppnotify = NULL;
pcontext = (fcnotify_context *)alloc_pemalloc(sizeof(fcnotify_context));
if(pcontext == NULL)
{
result = FATAL_OUT_OF_LMEMORY;
goto Finished;
}
pcontext->islocal = 0;
pcontext->isshutting = 0;
pcontext->iswow64 = 0;
pcontext->processid = 0;
pcontext->lscavenge = 0;
pcontext->ttlticks = 0;
pcontext->fcmemaddr = NULL;
pcontext->fcheader = NULL;
pcontext->fcalloc = NULL;
pcontext->fclock = NULL;
pcontext->fcaplist = NULL;
pcontext->listen_thread = NULL;
pcontext->port_handle = NULL;
pcontext->pidhandles = NULL;
*ppnotify = pcontext;
Finished:
if(FAILED(result))
{
dprintimportant("failure %d in fcnotify_create", result);
}
dprintverbose("end fcnotify_create");
return result;
}
int fcnotify_listenerexists(fcnotify_context *pnotify, const char * folderpath, unsigned char * listenerexists)
{
int result = NONFATAL;
int index = 0;
fcnotify_value * pvalue = NULL;
dprintverbose("start fcnotify_listenerexists");
*listenerexists = 0;
lock_readlock(pnotify->fclock);
/* Look if folder path is present in cache */
index = utils_getindex(folderpath, pnotify->fcheader->valuecount);
result = findfolder_in_cache(pnotify, folderpath, index, &pvalue);
if(FAILED(result))
{
goto Finished;
}
/* Check if listener for this folder still exists */
if (pvalue != NULL && pvalue->plistener != NULL)
{
*listenerexists = 1;
}
Finished:
if(FAILED(result))
{
dprintimportant("failure %d in fcnotify_listenerexists", result);
}
lock_readunlock(pnotify->fclock);
dprintverbose("end fcnotify_listenerexists");
return result;
}
void fcnotify_destroy(fcnotify_context * pnotify)
{
dprintverbose("start fcnotify_destroy");
if(pnotify != NULL)
{
alloc_pefree(pnotify);
pnotify = NULL;
}
dprintverbose("end fcnotify_destroy");
return;
}
int fcnotify_initialize(fcnotify_context * pnotify, unsigned short islocal, void * paplist, alloc_context * palloc, unsigned int filecount TSRMLS_DC)
{
int result = NONFATAL;
unsigned short locktype = LOCK_TYPE_SHARED;
fcnotify_header * header = NULL;
unsigned int msize = 0;
_ASSERT(pnotify != NULL);
_ASSERT(paplist != NULL);
_ASSERT(palloc != NULL);
_ASSERT(palloc->memaddr != NULL);
if(islocal)
{
locktype = LOCK_TYPE_LOCAL;
pnotify->islocal = islocal;
}
pnotify->islocal = islocal;
pnotify->fcaplist = paplist;
pnotify->fcalloc = palloc;
pnotify->processid = WCG(fmapgdata)->pid;
pnotify->fcmemaddr = palloc->memaddr;
pnotify->lscavenge = GetTickCount();
/* Get memory for fcnotify header */
msize = sizeof(fcnotify_header) + (filecount - 1) * sizeof(size_t);
pnotify->fcheader = (fcnotify_header *)alloc_get_cacheheader(pnotify->fcalloc, msize, CACHE_TYPE_FCNOTIFY);
if(pnotify->fcheader == NULL)
{
result = FATAL_FCNOTIFY_INITIALIZE;
goto Finished;
}
header = pnotify->fcheader;
/* Create reader writer lock for the file change notification hashtable */
result = lock_create(&pnotify->fclock);
if(FAILED(result))
{
goto Finished;
}
result = lock_initialize(pnotify->fclock, "FILE_CHANGE_NOTIFY", 1, locktype, LOCK_USET_SREAD_XWRITE, &header->rdcount TSRMLS_CC);
if(FAILED(result))
{
goto Finished;
}
/* Create IO completion port */
pnotify->port_handle = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, (ULONG_PTR)0, 0);
if(pnotify->port_handle == NULL)
{
result = FATAL_FCNOTIFY_INITIALIZE;
goto Finished;
}
/* Create listener thread */
pnotify->listen_thread = CreateThread(NULL, 0, change_notification_thread, (void *)pnotify, 0, NULL);
if(pnotify->listen_thread == NULL)
{
result = FATAL_FCNOTIFY_INITIALIZE;
goto Finished;
}
/* Create pidhandles hashtable */
pnotify->pidhandles = (HashTable *)alloc_pemalloc(sizeof(HashTable));
if(pnotify->pidhandles == NULL)
{
result = FATAL_OUT_OF_LMEMORY;
goto Finished;
}
zend_hash_init(pnotify->pidhandles, 0, NULL, NULL, 1);
Finished:
if(FAILED(result))
{
dprintimportant("failure %d in fcnotify_initialize", result);
if(pnotify->listen_thread != NULL)
{
CloseHandle(pnotify->listen_thread);
pnotify->listen_thread = NULL;
}
if(pnotify->port_handle != NULL)
{
CloseHandle(pnotify->port_handle);
pnotify->port_handle = NULL;
}
if(pnotify->fclock != NULL)
{
lock_terminate(pnotify->fclock);
lock_destroy(pnotify->fclock);
pnotify->fclock = NULL;
}
if(pnotify->pidhandles != NULL)
{
zend_hash_destroy(pnotify->pidhandles);
alloc_pefree(pnotify->pidhandles);
pnotify->pidhandles = NULL;
}
pnotify->fcaplist = NULL;
pnotify->fcheader = NULL;
pnotify->fcalloc = NULL;
}
return result;
}
void fcnotify_initheader(fcnotify_context * pnotify, unsigned int filecount)
{
fcnotify_header * pheader = NULL;
dprintverbose("start fcnotify_initheader");
_ASSERT(pnotify != NULL);
_ASSERT(pnotify->fcheader != NULL);
_ASSERT(filecount > 0);
pheader = pnotify->fcheader;
_ASSERT(pheader->values != NULL);
/* This method is called by aplist_initialize which is */
/* taking care of blocking other processes */
/* Also rdcount can be safely set to 0 as lock is not active */
pheader->rdcount = 0;
pheader->itemcount = 0;
pheader->valuecount = filecount;
memset((void *)pheader->values, 0, sizeof(size_t) * filecount);
dprintverbose("end fcnotify_initheader");
return;
}
void fcnotify_terminate(fcnotify_context * pnotify)
{
dprintverbose("start fcnotify_terminate");
if(pnotify != NULL)
{
if(pnotify->listen_thread != NULL)
{
if(pnotify->port_handle != NULL)
{
DWORD ret = 0;
/* Post termination key to completion port to terminate thread */
PostQueuedCompletionStatus(pnotify->port_handle, 0, FCNOTIFY_TERMKEY, NULL);
/* Wait for thread to finish */
WaitForSingleObject(pnotify->listen_thread, FIVE_SECOND_WAIT);
if (ret == WAIT_TIMEOUT || ret == WAIT_FAILED)
{
dprintimportant("Timed out waiting for fcnotify thread to terminate");
}
}
CloseHandle(pnotify->listen_thread);
pnotify->listen_thread = NULL;
}
if(pnotify->port_handle != NULL)
{
CloseHandle(pnotify->port_handle);
pnotify->port_handle = NULL;
}
if(pnotify->fclock != NULL)
{
lock_terminate(pnotify->fclock);
lock_destroy(pnotify->fclock);
pnotify->fclock = NULL;
}
if(pnotify->pidhandles != NULL)
{
zend_hash_destroy(pnotify->pidhandles);
alloc_pefree(pnotify->pidhandles);
pnotify->pidhandles = NULL;
}
pnotify->fcaplist = NULL;
pnotify->fcheader = NULL;
pnotify->fcalloc = NULL;
}
dprintverbose("end fcnotify_terminate");
return;
}
static int pidhandles_apply(void * pdestination TSRMLS_DC)
{
HANDLE * hprocess = NULL;
unsigned int exitcode = 0;
_ASSERT(pdestination != NULL);
hprocess = (HANDLE *)pdestination;
if(GetExitCodeProcess(*hprocess, &exitcode) && exitcode != STILL_ACTIVE)
{
CloseHandle(*hprocess);
return ZEND_HASH_APPLY_REMOVE;
}
else
{
return ZEND_HASH_APPLY_KEEP;
}
}
/* This method acquires write lock. Call without any lock */
static void run_fcnotify_scavenger(fcnotify_context * pnotify)
{
fcnotify_header * pheader = NULL;
fcnotify_value * pvalue = NULL;
fcnotify_value * pnext = NULL;
unsigned int index = 0;
unsigned int count = 0;
HashTable * phashtable = NULL;
TSRMLS_FETCH();
dprintverbose("start run_fcnotify_scavenger");
pheader = pnotify->fcheader;
count = pheader->valuecount;
phashtable = pnotify->pidhandles;
/* Go through all the entries and remove entries for which refcount is 0 */
/* Do it only for processes which are dead or if this was the owner pid */
lock_writelock(pnotify->fclock);
for(index = 0; index < count; index++)
{
pnext = FCNOTIFY_VALUE(pnotify->fcalloc, pheader->values[index]);
while(pnext != NULL)
{
pvalue = pnext;
pnext = FCNOTIFY_VALUE(pnotify->fcalloc, pvalue->next_value);
/* process alive check will remove entry from pidhandles if necessary */
if(pvalue->refcount == 0 &&
(pvalue->owner_pid == pnotify->processid || process_alive_check(pnotify, pvalue) == PROCESS_IS_DEAD))
{
remove_fcnotify_entry(pnotify, index, pvalue);
pvalue = NULL;
}
}
}
lock_writeunlock(pnotify->fclock);
/* Go through pidhandles table and remove entries for dead processes */
zend_hash_apply(phashtable, pidhandles_apply TSRMLS_CC);
pnotify->lscavenge = GetTickCount();
dprintverbose("end run_fcnotify_scavenger");
return;
}
static unsigned char process_alive_check(fcnotify_context * pnotify, fcnotify_value * pvalue)
{
HashTable * phashtable = NULL;
HANDLE hprocess = NULL;
HANDLE * phdata = NULL;
unsigned char listenp = PROCESS_IS_ALIVE;
unsigned int exitcode = 0;
HANDLE htoken = NULL;
unsigned int bthread = 0;
unsigned int ownerpid = 0;
_ASSERT(pnotify != NULL);
_ASSERT(pvalue != NULL);
ownerpid = pvalue->owner_pid;
/* If the check is for this process, return alive */
if(pnotify->processid == ownerpid)
{
goto Finished;
}
phashtable = pnotify->pidhandles;
if(zend_hash_index_find(phashtable, (ulong)ownerpid, (void **)&phdata) == FAILURE)
{
/* Check if impersonation is enabled */
/* If it is, get impersonated token and set it back after calling OpenProcess */
bthread = OpenThreadToken(GetCurrentThread(), TOKEN_IMPERSONATE, TRUE, &htoken);
if(bthread)
{
RevertToSelf();
}
hprocess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, ownerpid);
if(bthread)
{
SetThreadToken(NULL, htoken);
CloseHandle(htoken);
}