OpenProcess

Syntax

HANDLE OpenProcess(
  [in] DWORD dwDesiredAccess,
  [in] BOOL  bInheritHandle,
  [in] DWORD dwProcessId
);

OpenProcess function (processthreadsapi.h) - Win32 appsdocsmsft

Parameters

[in] dwDesiredAccess

The access to the process object. This access right is checked against the security descriptor for the process. This parameter can be one or more of the process access rights.

If the caller has enabled the SeDebugPrivilege privilege, the requested access is granted regardless of the contents of the security descriptor.

[in] bInheritHandle

If this value is TRUE, processes created by this process will inherit the handle. Otherwise, the processes do not inherit this handle.

[in] dwProcessId

The identifier of the local process to be opened.

If the specified process is the System Idle Process (0x00000000), the function fails and the last error code is ERROR_INVALID_PARAMETER. If the specified process is the System process or one of the Client Server Run-Time Subsystem (CSRSS) processes, this function fails and the last error code is ERROR_ACCESS_DENIED because their access restrictions prevent user-level code from opening them.

If you are using GetCurrentProcessId as an argument to this function, consider using GetCurrentProcess instead of OpenProcess, for improved performance.