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4. Handler Functions
Libgcrypt makes it possible to install so called `handler functions', which get called by Libgcrypt in case of certain events.
| 4.1 Progress handler | Using a progress handler function. | |
| 4.2 Allocation handler | Using special memory allocation functions. | |
| 4.3 Error handler | Using error handler functions. | |
| 4.4 Logging handler | Using a special logging function. |