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atexit: Clarify DLL behavior is the same as _onexit #5952

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atexit: Clarify DLL behavior is the same as _onexit #5952

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2 changes: 2 additions & 0 deletions docs/c-runtime-library/reference/atexit.md
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Expand Up @@ -36,6 +36,8 @@ The **`atexit`** function is passed the address of a function *`func`* to be cal

The code in the **`atexit`** function shouldn't contain any dependency on any DLL that could have already been unloaded when the **`atexit`** function is called.

In the case when **`atexit`** is called from within a DLL, routines registered with **`atexit`** run when the DLL is unloaded, after `DllMain` is called with `DLL_PROCESS_DETACH`.

To generate an ANSI-conformant application, use the ANSI-standard **`atexit`** function (rather than the similar **`_onexit`** function).

## Requirements
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