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| 1 // Copyright 2014 The Crashpad Authors. All rights reserved. | 1 // Copyright 2014 The Crashpad Authors. All rights reserved. |
| 2 // | 2 // |
| 3 // Licensed under the Apache License, Version 2.0 (the "License"); | 3 // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 // you may not use this file except in compliance with the License. | 4 // you may not use this file except in compliance with the License. |
| 5 // You may obtain a copy of the License at | 5 // You may obtain a copy of the License at |
| 6 // | 6 // |
| 7 // http://www.apache.org/licenses/LICENSE-2.0 | 7 // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 // | 8 // |
| 9 // Unless required by applicable law or agreed to in writing, software | 9 // Unless required by applicable law or agreed to in writing, software |
| 10 // distributed under the License is distributed on an "AS IS" BASIS, | 10 // distributed under the License is distributed on an "AS IS" BASIS, |
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| 36 // Returns a dlopen() handle to the same library that provides the | 36 // Returns a dlopen() handle to the same library that provides the |
| 37 // getsectbyname() function. getsectbyname() is always present in libmacho. | 37 // getsectbyname() function. getsectbyname() is always present in libmacho. |
| 38 // getsectiondata() and getsegmentdata() are not always present, but when they | 38 // getsectiondata() and getsegmentdata() are not always present, but when they |
| 39 // are, they’re in the same library as getsectbyname(). If the library cannot | 39 // are, they’re in the same library as getsectbyname(). If the library cannot |
| 40 // be found or a handle to it cannot be returned, returns nullptr. | 40 // be found or a handle to it cannot be returned, returns nullptr. |
| 41 void* SystemLibMachOHandle() { | 41 void* SystemLibMachOHandle() { |
| 42 Dl_info info; | 42 Dl_info info; |
| 43 if (!dladdr(reinterpret_cast<void*>(getsectbyname), &info)) { | 43 if (!dladdr(reinterpret_cast<void*>(getsectbyname), &info)) { |
| 44 return nullptr; | 44 return nullptr; |
| 45 } | 45 } |
| 46 return dlopen(info.dli_fname, RTLD_LAZY | RTLD_LOCAL); | 46 return dlopen(info.dli_fname, RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD); |
| 47 } | 47 } |
| 48 | 48 |
| 49 // Returns a function pointer to a function in libmacho based on a lookup of | 49 // Returns a function pointer to a function in libmacho based on a lookup of |
| 50 // that function by symbol name. Returns nullptr if libmacho cannot be found or | 50 // that function by symbol name. Returns nullptr if libmacho cannot be found or |
| 51 // opened, or if the named symbol cannot be found in libmacho. | 51 // opened, or if the named symbol cannot be found in libmacho. |
| 52 void* LookUpSystemLibMachOSymbol(const char* symbol) { | 52 void* LookUpSystemLibMachOSymbol(const char* symbol) { |
| 53 static void* dl_handle = SystemLibMachOHandle(); | 53 static void* dl_handle = SystemLibMachOHandle(); |
| 54 if (!dl_handle) { | 54 if (!dl_handle) { |
| 55 return nullptr; | 55 return nullptr; |
| 56 } | 56 } |
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| 98 LookUpSystemLibMachOSymbol("getsegmentdata")); | 98 LookUpSystemLibMachOSymbol("getsegmentdata")); |
| 99 if (system_getsegmentdata) { | 99 if (system_getsegmentdata) { |
| 100 return system_getsegmentdata(mhp, segname, size); | 100 return system_getsegmentdata(mhp, segname, size); |
| 101 } | 101 } |
| 102 return crashpad_getsegmentdata(mhp, segname, size); | 102 return crashpad_getsegmentdata(mhp, segname, size); |
| 103 } | 103 } |
| 104 | 104 |
| 105 } // extern "C" | 105 } // extern "C" |
| 106 | 106 |
| 107 #endif // MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7 | 107 #endif // MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7 |
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