src/lib/module-dir.h

#ifndef MODULE_DIR_H
#define MODULE_DIR_H

struct module_dir_load_settings {
    /* If abi_version is non-NULL and the module contains a version symbol,
       fail the load if they're different. In both strings ignore anything
       after the first '(' character, so the version can be e.g.:
       2.2.ABIv1(2.2.15) */
    const char *abi_version;
    /* Binary name used for checking if plugin is tried to be loaded for
       wrong binary. */
    const char *binary_name;
    /* Setting name used in plugin dependency error message */
    const char *setting_name;

    /* If non-NULL, load only modules where filter_callback returns TRUE */
    bool (*filter_callback)(const char *name, void *context);
    void *filter_context;

    /* Require all plugins to have <plugin_name>_init() function */
    bool require_init_funcs:1;
    /* Enable debug logging */
    bool debug:1;
    /* If dlopen() fails for some modules, silently skip it. */
    bool ignore_dlopen_errors:1;
    /* Don't fail if some specified modules weren't found */
    bool ignore_missing:1;
};

struct module {
    char *path, *name;

    void *handle;
    void (*init)(struct module *module);
    void (*deinit)(void);

    bool initialized:1;

        struct module *next;
};

/* Load modules in given directory. module_names is a space separated list of
   module names to load. */
struct module *module_dir_load(const char *dir, const char *module_names,
                   const struct module_dir_load_settings *set)
    ATTR_NULL(2);
/* Load modules that aren't already loaded. */
struct module *
module_dir_load_missing(struct module *old_modules,
            const char *dir, const char *module_names,
            const struct module_dir_load_settings *set)
    ATTR_NULL(1, 3);
/* Load modules that aren't already loaded. */
int module_dir_try_load_missing(struct module **modules,
                const char *dir, const char *module_names,
                const struct module_dir_load_settings *set,
                const char **error_r)
    ATTR_NULL(1, 3);
/* Call init() in all modules */
void module_dir_init(struct module *modules);
/* Call deinit() in all modules and mark them NULL so module_dir_unload()
   won't do it again. */
void module_dir_deinit(struct module *modules);
/* Unload all modules */
void module_dir_unload(struct module **modules);
/* Find a module by name. */
struct module *module_dir_find(struct module *modules, const char *name);

void *module_get_symbol(struct module *module, const char *symbol);
void *module_get_symbol_quiet(struct module *module, const char *symbol);

/* Returns module's base name from the filename. */
const char *module_file_get_name(const char *fname);
/* Returns module's name without "_plugin" suffix. */
const char *module_get_plugin_name(struct module *module);

#endif