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author | Adam Cozzette <acozzette@gmail.com> | 2017-03-09 14:30:50 -0800 |
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committer | GitHub <noreply@github.com> | 2017-03-09 14:30:50 -0800 |
commit | bbfb9d52da5d44f838bef2caa2be55d57a9d29a8 (patch) | |
tree | c5a1e98cf04b7092dbd9340307c172f2522e362c /ruby/ext/google/protobuf_c/wrap_memcpy.c | |
parent | 8e465dcf467beb92549e6d987e5dc3683b718f58 (diff) | |
parent | 9fa40314fcfd19d2e09459faeb480d213af56324 (diff) | |
download | protobuf-bbfb9d52da5d44f838bef2caa2be55d57a9d29a8.tar.gz protobuf-bbfb9d52da5d44f838bef2caa2be55d57a9d29a8.tar.bz2 protobuf-bbfb9d52da5d44f838bef2caa2be55d57a9d29a8.zip |
Merge pull request #2804 from acozzette/ruby-memcpy
Ruby: wrap calls to memcpy so that gem is compatible with pre-2.14 glibc
Diffstat (limited to 'ruby/ext/google/protobuf_c/wrap_memcpy.c')
-rw-r--r-- | ruby/ext/google/protobuf_c/wrap_memcpy.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/ruby/ext/google/protobuf_c/wrap_memcpy.c b/ruby/ext/google/protobuf_c/wrap_memcpy.c new file mode 100644 index 00000000..158952a8 --- /dev/null +++ b/ruby/ext/google/protobuf_c/wrap_memcpy.c @@ -0,0 +1,51 @@ +// 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, 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/google/protobuf/issues/2783). +// +// This wrapper is enabled by passing the linker flags -Wl,-wrap,memcpy in +// extconf.rb. +#ifdef __linux__ +#ifdef __x86_64__ +__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 |