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