### 4.4 Logging handler ¶

Libgcrypt provides a way to install a different log handler to be used instead of the internal. Only few programs make use of it and thus it has been deprecated. If a log handler is not installed and since version 1.11 Libgcrypt uses the logging facility of GpgRT (aka Libgpg-error). They are more flexible that Libgcrypt’s old logging functions and given that GpgRT is anyway a dependency of Libgcrypt it is better to always use the GpgRT logging facilities.

Data type: gcry_handler_log_t ¶

  This type is defined as: `void (*gcry_handler_log_t) (void *, int, const char *, va_list)`

Function: `void` gcry_set_log_handler `(gcry_handler_log_t func_log, void *cb_data)` ¶

  This deprecated function registers func_log as ‘logging handler’, which means that it will be called in case Libgcrypt wants to log a message. This function may and should be used prior to calling `gcry_check_version`.