Mercurial > pub > dyncall > dyncall
annotate dynload/dynload_unix.c @ 253:5cfe4322c500
- improved support for older OS versions for dynloads dlGetLibraryPath
| author | Tassilo Philipp |
|---|---|
| date | Mon, 15 May 2017 02:50:03 +0200 |
| parents | ab23f9f2934a |
| children | 9d70178c1ded |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 | |
| 3 Package: dyncall | |
| 4 Library: dynload | |
| 5 File: dynload/dynload_unix.c | |
| 6 Description: | |
| 7 License: | |
| 8 | |
| 242 | 9 Copyright (c) 2007-2017 Daniel Adler <dadler@uni-goettingen.de>, |
| 0 | 10 Tassilo Philipp <tphilipp@potion-studios.com> |
| 11 | |
| 12 Permission to use, copy, modify, and distribute this software for any | |
| 13 purpose with or without fee is hereby granted, provided that the above | |
| 14 copyright notice and this permission notice appear in all copies. | |
| 15 | |
| 16 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
| 17 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
| 18 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
| 19 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
| 22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 23 | |
| 24 */ | |
| 25 | |
| 26 | |
| 27 /* | |
| 28 | |
| 29 dynload_unix.c | |
| 30 | |
| 31 dynload module for .so (unix) and .dylib (mach-o darwin/OS X) files | |
| 32 | |
| 33 */ | |
| 34 | |
| 35 | |
| 36 #include "dynload.h" | |
| 242 | 37 #include "../autovar/autovar_OS.h" |
| 0 | 38 |
| 242 | 39 #include <string.h> |
| 40 | |
| 41 #if defined(__GLIBC__) /* to access dlinfo */ | |
| 42 # define _GNU_SOURCE | |
| 43 # define __USE_GNU | |
| 44 #endif | |
| 0 | 45 #include <dlfcn.h> |
| 46 | |
| 47 | |
| 48 DLLib* dlLoadLibrary(const char* libPath) | |
| 49 { | |
| 232 | 50 return (DLLib*)dlopen(libPath, RTLD_NOW|RTLD_GLOBAL); //@@@ should use RTLD_LAZY, maybe? |
| 0 | 51 } |
| 52 | |
| 53 | |
| 242 | 54 void* dlFindSymbol(DLLib* pLib, const char* pSymbolName) |
| 0 | 55 { |
| 242 | 56 return dlsym((void*)pLib, pSymbolName); |
| 57 } | |
| 58 | |
| 59 | |
| 60 void dlFreeLibrary(DLLib* pLib) | |
| 61 { | |
| 62 /* Check for NULL for cross-platform consistency. *BSD seems to do that in | |
| 63 dlclose, Linux does not. POSIX states "if handle does not refer to an open | |
| 64 object, dlclose() returns a non-zero value", which unfortunately sounds | |
| 65 like it's not explicitly specified. */ | |
| 66 if(pLib) | |
| 67 dlclose((void*)pLib); | |
| 0 | 68 } |
| 69 | |
| 70 | |
|
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71 |
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72 /* for dlopen-based dlGetLibraryPath impls below, prefer RTLD_NOLOAD */ |
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73 /* that merely checks lib names */ |
| 246 | 74 #if defined(RTLD_NOLOAD) |
| 75 # define RTLD_LIGHTEST RTLD_NOLOAD | |
| 76 #else | |
| 77 # define RTLD_LIGHTEST RTLD_LAZY | |
| 78 #endif | |
| 79 | |
| 80 | |
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81 /* code for dlGetLibraryPath is platform specific - if dlinfo() exists use */ |
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82 /* that (checked through existance of RTLD_DI_LINKMAP, usually a #define */ |
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83 /* for dlinfo(), or by OS (always on Solaris where it's from, usually on */ |
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84 /* Linux, where the flag might be an enum instead, ...) */ |
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85 #if defined(RTLD_DI_LINKMAP) || defined(OS_SunOS) || (defined(OS_Linux) && !defined(DL_DLADDR_TO_LIBPATH)) |
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86 |
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87 #include <link.h> |
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88 |
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89 int dlGetLibraryPath(DLLib* pLib, char* sOut, int bufSize) |
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90 { |
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91 struct link_map* p; |
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92 int l = -1; |
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93 if(dlinfo(pLib, RTLD_DI_LINKMAP, &p) == 0) { |
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94 l = strlen(p->l_name); |
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95 if(l < bufSize) /* l+'\0' <= bufSize */ |
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96 strcpy(sOut, p->l_name); |
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97 } |
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98 return l+1; /* strlen + '\0' */ |
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99 } |
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100 |
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101 |
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102 /* specific implementation needed on Darwin -----> */ |
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103 #elif defined(OS_Darwin) |
| 242 | 104 |
| 105 #include <stdint.h> | |
| 106 #include <mach-o/dyld.h> | |
| 107 | |
| 108 int dlGetLibraryPath(DLLib* pLib, char* sOut, int bufSize) | |
| 0 | 109 { |
| 242 | 110 uint32_t i; |
| 111 int l = -1; | |
| 112 | |
| 113 /*if(pLib == RTLD_DEFAULT) | |
| 114 return NULL; @@@ return exec's path */ | |
| 0 | 115 |
| 242 | 116 /* Darwin's code doesn't come with (non-standard) dlinfo(), so use dyld(1) */ |
| 117 /* code. There doesn't seem to be a direct way to query the library path, */ | |
| 118 /* so "double-load" temporarily all already loaded images (just increases */ | |
| 119 /* ref count) and compare handles until we found ours. Return the name. */ | |
| 120 for(i=_dyld_image_count(); i>0;) /* iterate libs from end, more likely ours */ | |
| 121 { | |
| 122 const char* libPath = _dyld_get_image_name(--i); | |
| 246 | 123 void* lib = dlopen(libPath, RTLD_LIGHTEST); |
| 242 | 124 if(lib) { |
| 246 | 125 dlclose(lib); |
| 126 /* compare handle pointers' high bits (in low 2 bits some flags might */ | |
| 127 /* be stored - should be safe b/c address needs alignment, anywas) */ | |
| 128 if(((intptr_t)pLib ^ (intptr_t)lib) < 4) { | |
| 242 | 129 l = strlen(libPath); |
| 130 if(l < bufSize) /* l+'\0' <= bufSize */ | |
| 131 strcpy(sOut, libPath); | |
| 132 break; | |
| 133 } | |
| 134 } | |
| 135 } | |
| 136 | |
| 137 return l+1; /* strlen + '\0' */ | |
| 0 | 138 } |
| 139 | |
| 242 | 140 |
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141 /* OpenBSD >= 3.7 has dl_iterate_phdr(), use it if not explicitly requesting */ |
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142 /* to use dladdr()-based guessing (set by configure) -----> */ |
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143 #elif defined(OS_OpenBSD) && !defined(DL_DLADDR_TO_LIBPATH) |
| 242 | 144 |
| 145 #include <sys/types.h> | |
| 146 #include <link.h> | |
| 147 | |
| 148 typedef struct { | |
| 149 DLLib* pLib; | |
| 150 char* sOut; | |
| 151 int bufSize; | |
| 152 } iter_phdr_data; | |
| 153 | |
| 154 static int iter_phdr_cb(struct dl_phdr_info* info, size_t size, void* data) | |
| 155 { | |
| 156 int l = -1; | |
| 157 iter_phdr_data* d = (iter_phdr_data*)data; | |
| 158 /* unable to relate info->dlpi_addr directly to our dlopen handle, let's */ | |
| 159 /* do what we do on macOS above, re-dlopen the already loaded lib (just */ | |
| 160 /* increases ref count) and compare handles. */ | |
| 246 | 161 void* lib = dlopen(info->dlpi_name, RTLD_LIGHTEST); |
| 242 | 162 if(lib) { |
| 246 | 163 dlclose(lib); |
| 164 if(lib == (void*)d->pLib) { | |
| 242 | 165 l = strlen(info->dlpi_name); |
| 166 if(l < d->bufSize) /* l+'\0' <= bufSize */ | |
| 167 strcpy(d->sOut, info->dlpi_name); | |
| 168 } | |
| 169 } | |
| 170 return l+1; /* strlen + '\0'; is 0 if lib not found, which continues iter */ | |
| 171 } | |
| 172 | |
| 173 int dlGetLibraryPath(DLLib* pLib, char* sOut, int bufSize) | |
| 174 { | |
| 175 iter_phdr_data d = { pLib, sOut, bufSize }; | |
| 176 return dl_iterate_phdr(iter_phdr_cb, &d); | |
| 177 } | |
| 178 | |
| 248 | 179 |
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180 /* fallback to dladdr() hack */ |
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181 #else |
| 248 | 182 |
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183 /* if nothing else is available, fall back to guessing using dladdr() - this */ |
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184 /* might not always work, as it's trying to getit via the _fini() symbol, */ |
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185 /* which is usually defined in ELF files, but not guaranteed */ |
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186 |
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187 /* @@@Note: On some platforms this might be improved, e.g. on BeOS we have */ |
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188 /* lt_dlgetinfo, which requires iterating over ltdl stuff, but was unable */ |
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189 /* to get that to work (would also introduce a link dependency on libltdl) */ |
| 248 | 190 |
| 191 int dlGetLibraryPath(DLLib* pLib, char* sOut, int bufSize) | |
| 192 { | |
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193 /* cross fingers that shared object is standard ELF and look for _fini */ |
| 248 | 194 int l = -1; |
| 195 void* s = dlsym((void*)pLib, "_fini"); | |
| 196 if(s) { | |
| 197 Dl_info i; | |
| 198 if(dladdr(s, &i) != 0) { | |
| 199 l = strlen(i.dli_fname); | |
| 200 if(l < bufSize) /* l+'\0' <= bufSize */ | |
| 201 strcpy(sOut, i.dli_fname); | |
| 202 } | |
| 203 } | |
| 204 return l+1; /* strlen + '\0' */ | |
| 205 } | |
| 206 | |
| 242 | 207 #endif |
| 208 |