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/*
* Copyright (c) 2015-16 David Lamparter, for NetDEF, Inc.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _FRR_MODULE_H
#define _FRR_MODULE_H
#include <stdint.h>
#include <stdbool.h>
#if !defined(__GNUC__)
#error module code needs GCC visibility extensions
#elif __GNUC__ < 4
#error module code needs GCC visibility extensions
#else
# define DSO_PUBLIC __attribute__ ((visibility ("default")))
# define DSO_SELF __attribute__ ((visibility ("protected")))
# define DSO_LOCAL __attribute__ ((visibility ("hidden")))
#endif
struct frrmod_runtime;
struct frrmod_info {
/* single-line few-word title */
const char *name;
/* human-readable version number, should not contain spaces */
const char *version;
/* one-paragraph description */
const char *description;
int (*init)(void);
};
/* primary entry point structure to be present in loadable module under
* "_frrmod_this_module" dlsym() name
*
* note space for future extensions is reserved below, so other modules
* (e.g. memory management, hooks) can add fields
*
* const members/info are in frrmod_info.
*/
struct frrmod_runtime {
struct frrmod_runtime *next;
const struct frrmod_info *info;
void *dl_handle;
bool finished_loading;
char *load_name;
char *load_args;
};
/* space-reserving foo */
struct _frrmod_runtime_size {
struct frrmod_runtime r;
/* this will barf if frrmod_runtime exceeds 1024 bytes ... */
uint8_t space[1024 - sizeof(struct frrmod_runtime)];
};
union _frrmod_runtime_u {
struct frrmod_runtime r;
struct _frrmod_runtime_size s;
};
extern union _frrmod_runtime_u _frrmod_this_module;
#define THIS_MODULE (&_frrmod_this_module.r)
#define FRR_COREMOD_SETUP(...) \
static const struct frrmod_info _frrmod_info = {__VA_ARGS__}; \
DSO_LOCAL union _frrmod_runtime_u _frrmod_this_module = { \
.r.info = &_frrmod_info, \
};
#define FRR_MODULE_SETUP(...) \
FRR_COREMOD_SETUP(__VA_ARGS__) \
DSO_SELF struct frrmod_runtime *frr_module = &_frrmod_this_module.r;
extern struct frrmod_runtime *frrmod_list;
extern void frrmod_init(struct frrmod_runtime *modinfo);
extern struct frrmod_runtime *frrmod_load(const char *spec, const char *dir,
char *err, size_t err_len);
#if 0
/* not implemented yet */
extern void frrmod_unload(struct frrmod_runtime *module);
#endif
#endif /* _FRR_MODULE_H */
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