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415 lines
12 KiB
C
415 lines
12 KiB
C
/*
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* Win32 process handles
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*
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* Copyright 1998 Alexandre Julliard
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*/
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#include <assert.h>
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#include <stdio.h>
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#include "debug.h"
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#include "winbase.h"
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#include "winerror.h"
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#include "heap.h"
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#include "process.h"
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#include "server.h"
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#include "thread.h"
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#define HTABLE_SIZE 0x30 /* Handle table initial size */
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#define HTABLE_INC 0x10 /* Handle table increment */
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/* Reserved access rights */
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#define RESERVED_ALL (0x0007 << RESERVED_SHIFT)
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#define RESERVED_SHIFT 25
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#define RESERVED_INHERIT (HANDLE_FLAG_INHERIT<<RESERVED_SHIFT)
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#define RESERVED_CLOSE_PROTECT (HANDLE_FLAG_PROTECT_FROM_CLOSE<<RESERVED_SHIFT)
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/***********************************************************************
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* HANDLE_GrowTable
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*/
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static BOOL32 HANDLE_GrowTable( PDB32 *process, INT32 incr )
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{
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HANDLE_TABLE *table;
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SYSTEM_LOCK();
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table = process->handle_table;
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table = HeapReAlloc( process->system_heap,
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HEAP_ZERO_MEMORY | HEAP_NO_SERIALIZE, table,
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sizeof(HANDLE_TABLE) +
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(table->count + incr - 1) * sizeof(HANDLE_ENTRY) );
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if (table)
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{
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table->count += incr;
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process->handle_table = table;
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}
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SYSTEM_UNLOCK();
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return (table != NULL);
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}
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/***********************************************************************
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* HANDLE_CreateTable
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*
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* Create a process handle table, optionally inheriting the parent's handles.
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*/
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BOOL32 HANDLE_CreateTable( PDB32 *pdb, BOOL32 inherit )
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{
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DWORD size;
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/* Process must not already have a handle table */
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assert( !pdb->handle_table );
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/* If this is the first process, simply allocate a table */
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if (!pdb->parent) inherit = FALSE;
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SYSTEM_LOCK();
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size = inherit ? pdb->parent->handle_table->count : HTABLE_SIZE;
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if ((pdb->handle_table = HeapAlloc( pdb->system_heap,
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HEAP_ZERO_MEMORY | HEAP_NO_SERIALIZE,
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sizeof(HANDLE_TABLE) +
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(size-1) * sizeof(HANDLE_ENTRY) )))
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{
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pdb->handle_table->count = size;
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if (inherit)
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{
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HANDLE_ENTRY *src = pdb->parent->handle_table->entries;
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HANDLE_ENTRY *dst = pdb->handle_table->entries;
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HANDLE32 h;
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for (h = 0; h < size; h++, src++, dst++)
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{
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/* Check if handle is valid and inheritable */
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if (src->ptr && (src->access & RESERVED_INHERIT))
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{
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dst->access = src->access;
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dst->ptr = src->ptr;
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dst->server = src->server;
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K32OBJ_IncCount( dst->ptr );
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}
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}
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}
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/* Handle 1 is the process itself (unless the parent decided otherwise) */
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if (!pdb->handle_table->entries[1].ptr)
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{
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pdb->handle_table->entries[1].ptr = &pdb->header;
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pdb->handle_table->entries[1].access = PROCESS_ALL_ACCESS;
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pdb->handle_table->entries[1].server = -1; /* FIXME */
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K32OBJ_IncCount( &pdb->header );
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}
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}
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SYSTEM_UNLOCK();
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return (pdb->handle_table != NULL);
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}
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/***********************************************************************
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* HANDLE_Alloc
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*
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* Allocate a handle for a kernel object and increment its refcount.
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*/
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HANDLE32 HANDLE_Alloc( PDB32 *pdb, K32OBJ *ptr, DWORD access,
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BOOL32 inherit, int server_handle )
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{
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HANDLE32 h;
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HANDLE_ENTRY *entry;
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assert( ptr );
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/* Set the inherit reserved flag */
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access &= ~RESERVED_ALL;
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if (inherit) access |= RESERVED_INHERIT;
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SYSTEM_LOCK();
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K32OBJ_IncCount( ptr );
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/* Don't try to allocate handle 0 */
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entry = pdb->handle_table->entries + 1;
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for (h = 1; h < pdb->handle_table->count; h++, entry++)
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if (!entry->ptr) break;
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if ((h < pdb->handle_table->count) || HANDLE_GrowTable( pdb, HTABLE_INC ))
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{
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entry = &pdb->handle_table->entries[h];
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entry->access = access;
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entry->ptr = ptr;
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entry->server = server_handle;
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SYSTEM_UNLOCK();
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return h;
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}
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K32OBJ_DecCount( ptr );
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SYSTEM_UNLOCK();
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if (server_handle != -1) CLIENT_CloseHandle( server_handle );
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SetLastError( ERROR_OUTOFMEMORY );
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return INVALID_HANDLE_VALUE32;
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}
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/***********************************************************************
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* HANDLE_GetObjPtr
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*
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* Retrieve a pointer to a kernel object and increments its reference count.
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* The refcount must be decremented when the pointer is no longer used.
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*/
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K32OBJ *HANDLE_GetObjPtr( PDB32 *pdb, HANDLE32 handle,
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K32OBJ_TYPE type, DWORD access,
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int *server_handle )
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{
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K32OBJ *ptr = NULL;
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SYSTEM_LOCK();
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if (HANDLE_IS_GLOBAL( handle ))
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{
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handle = HANDLE_GLOBAL_TO_LOCAL( handle );
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pdb = PROCESS_Initial();
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}
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if ((handle > 0) && (handle < pdb->handle_table->count))
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{
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HANDLE_ENTRY *entry = &pdb->handle_table->entries[handle];
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if ((entry->access & access) != access)
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WARN(win32, "Handle %08x bad access (acc=%08lx req=%08lx)\n",
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handle, entry->access, access );
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ptr = entry->ptr;
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if (server_handle) *server_handle = entry->server;
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}
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else if (handle == CURRENT_THREAD_PSEUDOHANDLE)
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{
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ptr = (K32OBJ *)THREAD_Current();
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if (server_handle) *server_handle = CURRENT_THREAD_PSEUDOHANDLE;
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}
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else if (handle == CURRENT_PROCESS_PSEUDOHANDLE)
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{
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ptr = (K32OBJ *)PROCESS_Current();
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if (server_handle) *server_handle = CURRENT_PROCESS_PSEUDOHANDLE;
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}
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if (ptr && ((type == K32OBJ_UNKNOWN) || (ptr->type == type)))
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K32OBJ_IncCount( ptr );
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else
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ptr = NULL;
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SYSTEM_UNLOCK();
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if (!ptr) SetLastError( ERROR_INVALID_HANDLE );
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return ptr;
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}
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/***********************************************************************
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* HANDLE_SetObjPtr
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*
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* Change the object pointer of a handle, and increment the refcount.
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* Use with caution!
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*/
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BOOL32 HANDLE_SetObjPtr( PDB32 *pdb, HANDLE32 handle, K32OBJ *ptr,
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DWORD access )
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{
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BOOL32 ret = FALSE;
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SYSTEM_LOCK();
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if ((handle > 0) && (handle < pdb->handle_table->count))
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{
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HANDLE_ENTRY *entry = &pdb->handle_table->entries[handle];
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K32OBJ *old_ptr = entry->ptr;
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K32OBJ_IncCount( ptr );
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entry->access = access;
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entry->ptr = ptr;
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if (old_ptr) K32OBJ_DecCount( old_ptr );
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ret = TRUE;
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}
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SYSTEM_UNLOCK();
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if (!ret) SetLastError( ERROR_INVALID_HANDLE );
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return ret;
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}
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/*********************************************************************
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* HANDLE_GetAccess
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*/
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static BOOL32 HANDLE_GetAccess( PDB32 *pdb, HANDLE32 handle, LPDWORD access )
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{
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BOOL32 ret = FALSE;
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SYSTEM_LOCK();
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if ((handle > 0) && (handle < pdb->handle_table->count))
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{
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HANDLE_ENTRY *entry = &pdb->handle_table->entries[handle];
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if (entry->ptr)
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{
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*access = entry->access & ~RESERVED_ALL;
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ret = TRUE;
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}
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}
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SYSTEM_UNLOCK();
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if (!ret) SetLastError( ERROR_INVALID_HANDLE );
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return ret;
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}
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/*********************************************************************
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* HANDLE_Close
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*/
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static BOOL32 HANDLE_Close( PDB32 *pdb, HANDLE32 handle )
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{
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BOOL32 ret = FALSE;
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K32OBJ *ptr;
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SYSTEM_LOCK();
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if ((handle > 0) && (handle < pdb->handle_table->count))
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{
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HANDLE_ENTRY *entry = &pdb->handle_table->entries[handle];
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if ((ptr = entry->ptr))
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{
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if (!(entry->access & RESERVED_CLOSE_PROTECT))
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{
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entry->access = 0;
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entry->ptr = NULL;
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if (entry->server != -1)
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CLIENT_CloseHandle( entry->server );
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K32OBJ_DecCount( ptr );
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ret = TRUE;
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}
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/* FIXME: else SetLastError */
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}
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}
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SYSTEM_UNLOCK();
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if (!ret) SetLastError( ERROR_INVALID_HANDLE );
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return ret;
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}
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/*********************************************************************
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* HANDLE_CloseAll
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*
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* Close all handles pointing to a given object (or all handles of the
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* process if the object is NULL)
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*/
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void HANDLE_CloseAll( PDB32 *pdb, K32OBJ *obj )
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{
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HANDLE_ENTRY *entry;
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K32OBJ *ptr;
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HANDLE32 handle;
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SYSTEM_LOCK();
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entry = pdb->handle_table->entries;
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for (handle = 0; handle < pdb->handle_table->count; handle++, entry++)
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{
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if (!(ptr = entry->ptr)) continue; /* empty slot */
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if (obj && (ptr != obj)) continue; /* not the right object */
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entry->access = 0;
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entry->ptr = NULL;
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if (entry->server != -1) CLIENT_CloseHandle( entry->server );
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K32OBJ_DecCount( ptr );
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}
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SYSTEM_UNLOCK();
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}
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/*********************************************************************
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* CloseHandle (KERNEL32.23)
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*/
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BOOL32 WINAPI CloseHandle( HANDLE32 handle )
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{
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return HANDLE_Close( PROCESS_Current(), handle );
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}
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/*********************************************************************
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* GetHandleInformation (KERNEL32.336)
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*/
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BOOL32 WINAPI GetHandleInformation( HANDLE32 handle, LPDWORD flags )
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{
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BOOL32 ret = FALSE;
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PDB32 *pdb = PROCESS_Current();
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SYSTEM_LOCK();
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if ((handle > 0) && (handle < pdb->handle_table->count))
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{
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HANDLE_ENTRY *entry = &pdb->handle_table->entries[handle];
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if (entry->ptr)
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{
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if (flags)
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*flags = (entry->access & RESERVED_ALL) >> RESERVED_SHIFT;
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ret = TRUE;
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}
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}
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SYSTEM_UNLOCK();
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if (!ret) SetLastError( ERROR_INVALID_HANDLE );
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return ret;
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}
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/*********************************************************************
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* SetHandleInformation (KERNEL32.653)
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*/
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BOOL32 WINAPI SetHandleInformation( HANDLE32 handle, DWORD mask, DWORD flags )
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{
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BOOL32 ret = FALSE;
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PDB32 *pdb = PROCESS_Current();
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mask = (mask << RESERVED_SHIFT) & RESERVED_ALL;
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flags = (flags << RESERVED_SHIFT) & RESERVED_ALL;
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SYSTEM_LOCK();
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if ((handle > 0) && (handle < pdb->handle_table->count))
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{
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HANDLE_ENTRY *entry = &pdb->handle_table->entries[handle];
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if (entry->ptr)
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{
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entry->access = (entry->access & ~mask) | flags;
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ret = TRUE;
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}
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}
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SYSTEM_UNLOCK();
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if (!ret) SetLastError( ERROR_INVALID_HANDLE );
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return ret;
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}
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/*********************************************************************
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* DuplicateHandle (KERNEL32.192)
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*/
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BOOL32 WINAPI DuplicateHandle( HANDLE32 source_process, HANDLE32 source,
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HANDLE32 dest_process, HANDLE32 *dest,
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DWORD access, BOOL32 inherit, DWORD options )
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{
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PDB32 *src_pdb = NULL, *dst_pdb = NULL;
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K32OBJ *obj = NULL;
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BOOL32 ret = FALSE;
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HANDLE32 handle;
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int src_process, src_handle, dst_process, dst_handle;
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SYSTEM_LOCK();
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if (!(src_pdb = PROCESS_GetPtr( source_process, PROCESS_DUP_HANDLE, &src_process )))
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goto done;
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if (!(obj = HANDLE_GetObjPtr( src_pdb, source, K32OBJ_UNKNOWN, 0, &src_handle )))
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goto done;
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/* Now that we are sure the source is valid, handle the options */
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if (options & DUPLICATE_SAME_ACCESS)
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HANDLE_GetAccess( src_pdb, source, &access );
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if (options & DUPLICATE_CLOSE_SOURCE)
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HANDLE_Close( src_pdb, source );
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/* And duplicate the handle in the dest process */
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if (!(dst_pdb = PROCESS_GetPtr( dest_process, PROCESS_DUP_HANDLE, &dst_process )))
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goto done;
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if ((src_process != -1) && (src_handle != -1) && (dst_process != -1))
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dst_handle = CLIENT_DuplicateHandle( src_process, src_handle, dst_process, -1,
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access, inherit, options );
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else
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dst_handle = -1;
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if ((handle = HANDLE_Alloc( dst_pdb, obj, access, inherit,
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dst_handle )) != INVALID_HANDLE_VALUE32)
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{
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if (dest) *dest = handle;
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ret = TRUE;
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}
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done:
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if (dst_pdb) K32OBJ_DecCount( &dst_pdb->header );
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if (obj) K32OBJ_DecCount( obj );
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if (src_pdb) K32OBJ_DecCount( &src_pdb->header );
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SYSTEM_UNLOCK();
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return ret;
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}
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