BYHANDLEFILEINFORMATION

BYHANDLEFILEINFORMATION is a structure used in Windows operating system programming, specifically within the context of file system operations. It is defined in the `winnt.h` header file and is associated with the `NtQuerySystemInformation` function, a low-level API call that retrieves various system-wide information.

When `NtQuerySystemInformation` is called with the `SystemHandleInformation` class, it returns an array of BYHANDLEFILEINFORMATION structures. Each BYHANDLEFILEINFORMATION structure provides details about a specific open file handle on the system. This information is crucial for system monitoring tools, debugging, and understanding resource usage.

The fields within BYHANDLEFILEINFORMATION include the process ID (PID) of the process that opened the handle, the handle type (e.g., File, Event, Section), and the handle's value. It also contains information related to the object the handle points to, such as the object's name or its attributes. Developers can use this structure to enumerate open files, identify which processes are holding them, and potentially diagnose issues related to file locking or resource leaks. Accessing and interpreting this information typically requires elevated privileges.