What is DuplicateHandle (API)?

Windows programming Interview Questions and Answers

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21. What is DuplicateHandle (API)?

Takes an entry in one process’s handle table and makes a copy of the entry into another process’s handle table

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Other Interview Questions

• What are types of kernel objects?
• What is a kernel object?
• User can access these kernel objects structures?
• If we cannot alter these Kernel Object structures directly, how do our applications manipulate these kernel objects?
• How owns the Kernel Object?
• How does the kernel object outlive the process that created it?
• Which is the data member common to all the kernel object and what is the use of it?
• How to identify the difference between the kernel object and user object?
• What is the purpose of Process Handle Table?
• Name few functions that create Kernel Objects?
• What is handle?
• How the handle helps in manipulating the kernel objects?
• What happens when the CloseHandle(handle) is called?
• You forget to call CloseHandle - will there be a memory leak?
• What is the need of process relative handles?
• How the handles are handled in the child process?
• Why the entries in the parent process table and child table are same?
• What about the usage count in the parent child process tables?
• What are Named Objects?
• What do you mean by unnamed object?
• What is DuplicateHandle (API)?
• What is a thread?
• What is the limit on per process for creating a thread?
• What is Synchronization Objects?
• What is Event Object and why it is used?
• What is signaled and non signaled state?
• APIs for creating event and set and reset the events
• What is Mutex Object and why it is used?
• How do I create a Mutex?
• How do other threads own the mutex?
• How do other threads own the mutex?