mongoc_client_select_server(3)

MONGOC_CLIENT_SELECT_SERVER(3)

libmongoc

MONGOC_CLIENT_SELECT_SERVER(3)

SYNOPSIS

mongoc_server_description_t *
mongoc_client_select_server (mongoc_client_t *client,


                             bool for_writes,


                             const mongoc_read_prefs_t *prefs,


                             bson_error_t *error);

Choose a server for an operation, according to the logic described in the Server Selection Spec.

Use this function only for building a language driver that wraps the C Driver. When writing applications in C, higher-level functions automatically select a suitable server.

PARAMETERS

client: A mongoc_client_t <>.
for_writes: Whether to choose a server suitable for writes or reads.
prefs: An optional mongoc_read_prefs_t <>. If for_writes is true, prefs must be NULL. Otherwise, use prefs to customize server selection, or pass NULL to use read preference PRIMARY.
error: An optional location for a bson_error_t <> or NULL.

RETURNS

A mongoc_server_description_t <> that must be freed with mongoc_server_description_destroy() <>. If no suitable server is found, returns NULL and error is filled out.

Author

MongoDB, Inc

Copyright

2009-present, MongoDB, Inc.

February 10, 2026

1.30.7