hFile (HFILE) - input

File handle.

pflUnlock (PFILELOCK) - input

Address of the structure containing the offset and length of a range to be unlocked.

pflLock (PFILELOCK) - input

Address of the structure containing the offset and length of a range to be locked.

timeout (ULONG) - input

The maximum time, in milliseconds, that the process is to wait for the requested locks.

flags (ULONG) - input

Flags that describe the action to be taken.

This parameter has the following bit fields:

Bit

Description
31-2
Reserved flags
1
Atomic

This bit defines a request for atomic locking. If this bit is set to 1 and the lock range is equal to the unlock range, an atomic lock occurs. If this bit is set to 1 and the lock range is not equal to the unlock range, an error is returned.

If this bit is set to 0, then the lock may or may not occur atomically with the unlock.

0
Share

This bit defines the type of access that other processes may have to the file range that is being locked.

If this bit is set to 0 (the default), other processes have no access to the locked file range. The current process has exclusive access to the locked file range, which must not overlap any other locked file range.

If this bit is set to 1, the current process and other processes have shared read-only access to the locked file range. A file range with shared access may overlap any other file range with shared access, but must not overlap any other file range with exclusive access.

ulrc (APIRET) - returns

Return Code.

DosSetFileLocks returns one of the following values:

• NO_ERROR 1
  ERROR_INVALID_FUNCTION
  6
  ERROR_INVALID_HANDLE
  33
  ERROR_LOCK_VIOLATION
  36
  ERROR_SHARING_BUFFER_EXCEEDED
  87
  ERROR_INVALID_PARAMETER
  95
  ERROR_INTERRUPT
  174
  ERROR_ATOMIC_LOCK_NOT_SUPPORTED
  175
  ERROR_READ_LOCKS_NOT_SUPPORTED
  For a full list of error codes, see Errors.

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