]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * Copyright (C) 1996-2023 The Squid Software Foundation and contributors | |
3 | * | |
4 | * Squid software is distributed under GPLv2+ license and includes | |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
7 | */ | |
8 | ||
9 | #include "squid.h" | |
10 | #include "base/TextException.h" | |
11 | #include "libltdl/ltdl.h" /* generated file */ | |
12 | #include "LoadableModule.h" | |
13 | ||
14 | // Note: We must use preprocessor instead of C ifs because if dlopen() | |
15 | // is seen by the static linker, the linker will complain. | |
16 | ||
17 | LoadableModule::LoadableModule(const SBuf &aName): | |
18 | theName(aName) | |
19 | { | |
20 | // Initialise preloaded symbol lookup table. | |
21 | LTDL_SET_PRELOADED_SYMBOLS(); | |
22 | if (lt_dlinit() != 0) | |
23 | throw TexcHere("internal error: cannot initialize libtool module loader"); | |
24 | } | |
25 | ||
26 | LoadableModule::~LoadableModule() | |
27 | { | |
28 | if (loaded()) | |
29 | unload(); | |
30 | assert(lt_dlexit() == 0); // XXX: replace with a warning | |
31 | } | |
32 | ||
33 | bool | |
34 | LoadableModule::loaded() const | |
35 | { | |
36 | return theHandle != nullptr; | |
37 | } | |
38 | ||
39 | void | |
40 | LoadableModule::load() | |
41 | { | |
42 | if (loaded()) | |
43 | throw TexcHere("internal error: reusing LoadableModule object"); | |
44 | ||
45 | theHandle = openModule(); | |
46 | ||
47 | if (!loaded()) | |
48 | throw TexcHere(errorMsg()); | |
49 | } | |
50 | ||
51 | void | |
52 | LoadableModule::unload() | |
53 | { | |
54 | if (!loaded()) | |
55 | throw TexcHere("internal error: unloading not loaded module"); | |
56 | ||
57 | if (!closeModule()) | |
58 | throw TexcHere(errorMsg()); | |
59 | ||
60 | theHandle = nullptr; | |
61 | } | |
62 | ||
63 | void * | |
64 | LoadableModule::openModule() | |
65 | { | |
66 | return lt_dlopen(theName.c_str()); | |
67 | } | |
68 | ||
69 | bool | |
70 | LoadableModule::closeModule() | |
71 | { | |
72 | // we cast to avoid including ltdl.h in LoadableModule.h | |
73 | return lt_dlclose(static_cast<lt_dlhandle>(theHandle)) == 0; | |
74 | } | |
75 | ||
76 | const char * | |
77 | LoadableModule::errorMsg() | |
78 | { | |
79 | return lt_dlerror(); | |
80 | } | |
81 |