# Library Initialization

A simple, common example

```

struct ndpi_detection_module_struct *ndpi_struct; ndpi_cfg_error rc; int ret;

ndpi_struct = ndpi_init_detection_module(NULL); if(!ndpi_struct) {

ERROR;

}

/* Configuration */

rc = ndpi_set_config(ndpi_struct, “tls”, “certificate_expiration_threshold”, “10”); if(rc != NDPI_CFG_OK) {

ERROR;

}

/* Finalization */ ret = ndpi_finalize_initialization(ndpi_struct); if(ret != 0) {

ERROR;

}

/* Initialization done, now you can feed packets to the library */

/* Cleanup */

ndpi_exit_detection_module(ndpi_struct);

```

A more complex example, with global context and a shared Oookla LRU cache (all the others caches are local)

```

struct ndpi_global_context *g_ctx; struct ndpi_detection_module_struct *ndpi_structs[num_local_contexts]; ndpi_cfg_error rc; int i, ret;

g_ctx = ndpi_global_init(); if(!g_ctx) {

ERROR;

}

for(i = 0; i < num_local_contexts; i++) {

ndpi_structs[i] = ndpi_init_detection_module(g_ctx); if(!ndpi_struct[i]) {

ERROR;

}

rc = ndpi_set_config(ndpi_structs[i], NULL, “lru.ookla.scope”, “1”); if(rc != NDPI_CFG_OK) {

ERROR;

}

ret = ndpi_finalize_initialization(ndpi_structs[i]); if(ret != 0) {

ERROR;

}

}

/* Initialization done */

/* Cleanup */

for(i = 0; i < num_local_contexts; i++) {

ndpi_exit_detection_module(ndpi_structs[i]);

}

ndpi_global_deinit(g_ctx);

```

# :parser: myst_parser.sphinx_