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1 | /* |
2 | * Copyright (c) 2015-16 David Lamparter, for NetDEF, Inc. | |
3 | * | |
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4 | * Permission to use, copy, modify, and distribute this software for any |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice appear in all copies. | |
30771d65 | 7 | * |
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8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
30771d65 DL |
15 | */ |
16 | ||
17 | #ifndef _FRR_MODULE_H | |
18 | #define _FRR_MODULE_H | |
19 | ||
20 | #include <stdint.h> | |
21 | #include <stdbool.h> | |
22 | ||
23 | #if !defined(__GNUC__) | |
d62a17ae | 24 | #error module code needs GCC visibility extensions |
30771d65 | 25 | #elif __GNUC__ < 4 |
d62a17ae | 26 | #error module code needs GCC visibility extensions |
30771d65 DL |
27 | #else |
28 | # define DSO_PUBLIC __attribute__ ((visibility ("default"))) | |
29 | # define DSO_SELF __attribute__ ((visibility ("protected"))) | |
30 | # define DSO_LOCAL __attribute__ ((visibility ("hidden"))) | |
31 | #endif | |
32 | ||
33 | struct frrmod_runtime; | |
34 | ||
35 | struct frrmod_info { | |
36 | /* single-line few-word title */ | |
37 | const char *name; | |
38 | /* human-readable version number, should not contain spaces */ | |
39 | const char *version; | |
40 | /* one-paragraph description */ | |
41 | const char *description; | |
42 | ||
43 | int (*init)(void); | |
44 | }; | |
45 | ||
46 | /* primary entry point structure to be present in loadable module under | |
47 | * "_frrmod_this_module" dlsym() name | |
48 | * | |
49 | * note space for future extensions is reserved below, so other modules | |
50 | * (e.g. memory management, hooks) can add fields | |
51 | * | |
52 | * const members/info are in frrmod_info. | |
53 | */ | |
54 | struct frrmod_runtime { | |
55 | struct frrmod_runtime *next; | |
56 | ||
57 | const struct frrmod_info *info; | |
58 | void *dl_handle; | |
59 | bool finished_loading; | |
60 | ||
61 | char *load_name; | |
62 | char *load_args; | |
63 | }; | |
64 | ||
65 | /* space-reserving foo */ | |
66 | struct _frrmod_runtime_size { | |
67 | struct frrmod_runtime r; | |
68 | /* this will barf if frrmod_runtime exceeds 1024 bytes ... */ | |
69 | uint8_t space[1024 - sizeof(struct frrmod_runtime)]; | |
70 | }; | |
71 | union _frrmod_runtime_u { | |
72 | struct frrmod_runtime r; | |
73 | struct _frrmod_runtime_size s; | |
74 | }; | |
75 | ||
76 | extern union _frrmod_runtime_u _frrmod_this_module; | |
77 | #define THIS_MODULE (&_frrmod_this_module.r) | |
78 | ||
d62a17ae | 79 | #define FRR_COREMOD_SETUP(...) \ |
80 | static const struct frrmod_info _frrmod_info = {__VA_ARGS__}; \ | |
81 | DSO_LOCAL union _frrmod_runtime_u _frrmod_this_module = { \ | |
82 | .r.info = &_frrmod_info, \ | |
30771d65 | 83 | }; |
d62a17ae | 84 | #define FRR_MODULE_SETUP(...) \ |
85 | FRR_COREMOD_SETUP(__VA_ARGS__) \ | |
30771d65 DL |
86 | DSO_SELF struct frrmod_runtime *frr_module = &_frrmod_this_module.r; |
87 | ||
88 | extern struct frrmod_runtime *frrmod_list; | |
89 | ||
90 | extern void frrmod_init(struct frrmod_runtime *modinfo); | |
d62a17ae | 91 | extern struct frrmod_runtime *frrmod_load(const char *spec, const char *dir, |
92 | char *err, size_t err_len); | |
30771d65 DL |
93 | #if 0 |
94 | /* not implemented yet */ | |
95 | extern void frrmod_unload(struct frrmod_runtime *module); | |
96 | #endif | |
97 | ||
98 | #endif /* _FRR_MODULE_H */ |