lib/kernel32/file/lock.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS system libraries
   5  * FILE:            lib/kernel32/file/file.c
   6  * PURPOSE:         Directory functions
   7  * PROGRAMMER:      Ariadne ( ariadne@xs4all.nl)
   8  *                  GetTempFileName is modified from WINE [ Alexandre Juiliard ]
   9  * UPDATE HISTORY:
  10  *                  Created 01/11/98
  11  */
  12
  13 /* FIXME: the large integer manipulations in this file dont handle overflow  */
  14
  15 /* INCLUDES ****************************************************************/
  16
  17 #include <k32.h>
  18
  19 #define NDEBUG
  20 #include <kernel32/kernel32.h>
  21
  22 /* FUNCTIONS ****************************************************************/
  23
  24 WINBOOL
  25 STDCALL
  26 LockFile(
  27          HANDLE hFile,
  28          DWORD dwFileOffsetLow,
  29          DWORD dwFileOffsetHigh,
  30          DWORD nNumberOfBytesToLockLow,
  31          DWORD nNumberOfBytesToLockHigh
  32          )
  33 {
  34         DWORD dwReserved;
  35         OVERLAPPED Overlapped;
  36
  37         Overlapped.Offset = dwFileOffsetLow;
  38         Overlapped.OffsetHigh = dwFileOffsetHigh;
  39         dwReserved = 0;
  40
  41         return LockFileEx(hFile, LOCKFILE_FAIL_IMMEDIATELY|LOCKFILE_EXCLUSIVE_LOCK,dwReserved,nNumberOfBytesToLockLow, nNumberOfBytesToLockHigh, &Overlapped ) ;
  42
  43 }
  44
  45 WINBOOL
  46 STDCALL
  47 LockFileEx(
  48            HANDLE hFile,
  49            DWORD dwFlags,
  50            DWORD dwReserved,
  51            DWORD nNumberOfBytesToLockLow,
  52            DWORD nNumberOfBytesToLockHigh,
  53            LPOVERLAPPED lpOverlapped
  54            )
  55 {
  56    LARGE_INTEGER BytesToLock;
  57    BOOL LockImmediate;
  58    BOOL LockExclusive;
  59    NTSTATUS errCode;
  60    LARGE_INTEGER Offset;
  61
  62    if(dwReserved != 0)
  63      {
  64         SetLastError(ERROR_INVALID_PARAMETER);
  65         return FALSE;
  66      }
  67
  68    lpOverlapped->Internal = STATUS_PENDING;
  69
  70    Offset.u.LowPart = lpOverlapped->Offset;
  71    Offset.u.HighPart = lpOverlapped->OffsetHigh;
  72
  73    if ( (dwFlags & LOCKFILE_FAIL_IMMEDIATELY) == LOCKFILE_FAIL_IMMEDIATELY )
  74      LockImmediate = TRUE;
  75    else
  76      LockImmediate = FALSE;
  77
  78    if ( (dwFlags & LOCKFILE_EXCLUSIVE_LOCK) == LOCKFILE_EXCLUSIVE_LOCK )
  79      LockExclusive = TRUE;
  80    else
  81      LockExclusive = FALSE;
  82
  83    BytesToLock.u.LowPart = nNumberOfBytesToLockLow;
  84    BytesToLock.u.HighPart = nNumberOfBytesToLockHigh;
  85
  86    errCode = NtLockFile(hFile,
  87                         NULL,
  88                         NULL,
  89                         NULL,
  90                         (PIO_STATUS_BLOCK)lpOverlapped,
  91                         &Offset,
  92                         &BytesToLock,
  93                         NULL,
  94                         LockImmediate,
  95                         LockExclusive);
  96    if ( !NT_SUCCESS(errCode) )
  97      {
  98       SetLastErrorByStatus (errCode);
  99       return FALSE;
 100      }
 101
 102    return TRUE;
 103
 104 }
 105
 106 WINBOOL
 107 STDCALL
 108 UnlockFile(
 109            HANDLE hFile,
 110            DWORD dwFileOffsetLow,
 111            DWORD dwFileOffsetHigh,
 112            DWORD nNumberOfBytesToUnlockLow,
 113            DWORD nNumberOfBytesToUnlockHigh
 114            )
 115 {
 116         DWORD dwReserved;
 117         OVERLAPPED Overlapped;
 118         Overlapped.Offset = dwFileOffsetLow;
 119         Overlapped.OffsetHigh = dwFileOffsetHigh;
 120         dwReserved = 0;
 121         return UnlockFileEx(hFile, dwReserved, nNumberOfBytesToUnlockLow, nNumberOfBytesToUnlockHigh, &Overlapped);
 122
 123 }
 124
 125
 126
 127 WINBOOL
 128 STDCALL
 129 UnlockFileEx(
 130         HANDLE hFile,
 131         DWORD dwReserved,
 132         DWORD nNumberOfBytesToUnLockLow,
 133         DWORD nNumberOfBytesToUnLockHigh,
 134         LPOVERLAPPED lpOverlapped
 135         )
 136 {
 137    LARGE_INTEGER BytesToUnLock;
 138    LARGE_INTEGER StartAddress;
 139    NTSTATUS errCode;
 140
 141    if(dwReserved != 0)
 142      {
 143         SetLastError(ERROR_INVALID_PARAMETER);
 144         return FALSE;
 145      }
 146    if ( lpOverlapped == NULL )
 147      {
 148         SetLastError(ERROR_INVALID_PARAMETER);
 149         return FALSE;
 150      }
 151
 152    BytesToUnLock.u.LowPart = nNumberOfBytesToUnLockLow;
 153    BytesToUnLock.u.HighPart = nNumberOfBytesToUnLockHigh;
 154
 155    StartAddress.u.LowPart = lpOverlapped->Offset;
 156    StartAddress.u.HighPart = lpOverlapped->OffsetHigh;
 157
 158    errCode = NtUnlockFile(hFile,
 159                           (PIO_STATUS_BLOCK)lpOverlapped,
 160                           &StartAddress,
 161                           &BytesToUnLock,
 162                           NULL);
 163    if ( !NT_SUCCESS(errCode) ) {
 164       SetLastErrorByStatus (errCode);
 165       return FALSE;
 166    }
 167
 168    return TRUE;
 169 }
 170
 171 /* EOF */