| // Protocol Buffers - Google's data interchange format |
| // Copyright 2017 Google Inc. All rights reserved. |
| // https://developers.google.com/protocol-buffers/ |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include <string.h> |
| |
| // On x86-64 Linux with glibc, we link against the 2.2.5 version of memcpy so |
| // that we avoid depending on the 2.14 version of the symbol. This way, |
| // distributions that are using pre-2.14 versions of glibc can successfully use |
| // the gem we distribute |
| // (https://github.com/protocolbuffers/protobuf/issues/2783). |
| // |
| // This wrapper is enabled by passing the linker flags -Wl,-wrap,memcpy in |
| // extconf.rb. |
| #ifdef __linux__ |
| #if defined(__x86_64__) && defined(__GNU_LIBRARY__) |
| __asm__(".symver memcpy,memcpy@GLIBC_2.2.5"); |
| void *__wrap_memcpy(void *dest, const void *src, size_t n) { |
| return memcpy(dest, src, n); |
| } |
| #else |
| void *__wrap_memcpy(void *dest, const void *src, size_t n) { |
| return memmove(dest, src, n); |
| } |
| #endif |
| #endif |
