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Handle (computing)
In computer programming, a handle is an abstract reference to a resource. Handles are used when application software references blocks of memory or objects managed by another system, such as a database or an operating system. Resource handles can be opaque identifiers, in which case they are often integer numbers, or they can be pointers that allow access to further information. Common resource handles are file descriptors, sockets, database connections, process identifiers (PIDs), and job IDs.
== Comparison to pointers ==
While a pointer contains the address of the item to which it refers, a handle is an abstraction of a reference which is managed externally; its opacity allows the referent to be relocated in memory by the system without invalidating the handle, which is impossible with pointers. The extra layer of indirection also increases the control the managing system has over operations performed on the referent. Typically the handle is an index or a pointer into a global array of tombstones.
A handle leak is a type of software bug that occurs when a computer program asks for a handle to a resource but does not free the handle when it is no longer used; this is a form of resource leak, similar to a memory leak for a pointer to memory.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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