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MONGOC_INIT(3) libmongoc MONGOC_INIT(3)

SYNOPSIS

void
mongoc_init (void);


DESCRIPTION

Initialize the MongoDB C Driver by calling mongoc_init() <> exactly once at the beginning of your program. It is responsible for initializing global state such as process counters, SSL, and threading primitives.

Exception to this is mongoc_log_set_handler(), which should be called before mongoc_init() or some log traces would not use your log handling function. See Custom Log Handlers <#custom-log-handlers> for a detailed example.

Call mongoc_cleanup() <> exactly once at the end of your program to release all memory and other resources allocated by the driver. You must not call any other MongoDB C Driver functions after mongoc_cleanup() <>. Note that mongoc_init() <> does not reinitialize the driver after mongoc_cleanup() <>.

Author

MongoDB, Inc

Copyright

2009-present, MongoDB, Inc.

November 26, 2025 2.2.0