dlmod.h

/******************************************************************************
 * Copyright (C) 2014-2015
 * file:    libdlmod.h
 * author:  gozfree <gozfree@163.com>
 * created: 2015-11-09 18:51
 * updated: 2015-11-09 18:51
 ******************************************************************************/
#ifndef LIBDLMOD_H
#define LIBDLMOD_H

#ifdef __cplusplus
extern "C" {
#endif

struct capability_desc {
    int entry;
    char **cap;
};

struct dl_handle {
    void *handle;
};

struct dl_handle *dl_load(const char *path_name);
int dl_capability(struct dl_handle *dl, const char *mod_name,
                struct capability_desc *desc);

void *dl_get_func(struct dl_handle *dl, const char *name);
void *dl_override(const char *name);
void dl_unload(struct dl_handle *dl);

/*
 * using HOOK_CALL(api, args...), prev/post functions can be hook into api
 */
#define HOOK_CALL(func, ...) \
    ({ \
        func##_prev(__VA_ARGS__); \
        __typeof__(func) *sym = dl_override(#func); \
        sym(__VA_ARGS__); \
        func##_post(__VA_ARGS__); \
    })

/*
 * using CALL(api, args...), you need override api
 */
#define CALL(func, ...) \
    ({__typeof__(func) *sym = (__typeof__(func) *)dl_override(#func); sym(__VA_ARGS__);}) \


#ifdef __cplusplus
}
#endif
#endif