[Abandoned-Replaced] Machinery for loading of dynamic libraries.

Dockerfile.miniApp

@@ -12,6 +12,10 @@ WORKDIR /arrowdev
 # Clone mini-app source
 RUN git clone -b dev-miniapp https://github.com/protegrity/arrow.git .
 
+# some utils
+RUN apt-get update && \
+    apt-get install -y gdb valgrind vim thrift-compiler less 
+
 # Build Arrow C++ libraries
 RUN cd /arrowdev/cpp && \
     rm -rf build && \

build-clean.sh

@@ -0,0 +1,14 @@
+cd /arrowdev/cpp
+
+rm -rf build && mkdir build && cd build
+cmake -GNinja \
+  -DARROW_WITH_SNAPPY=ON \
+  -DCMAKE_INSTALL_PREFIX=$(pwd)/install \
+  -DARROW_PARQUET=ON \
+  -DPARQUET_REQUIRE_ENCRYPTION=ON \
+  -DARROW_COMPUTE=ON \
+  -DARROW_PYTHON=ON \
+  -DCMAKE_BUILD_TYPE=Debug \
+  ..
+ninja install -j 8
+

build-tests.sh

@@ -0,0 +1,16 @@
+cd /arrowdev/cpp/build
+
+cmake -GNinja \
+-DARROW_WITH_SNAPPY=ON \
+-DCMAKE_BUILD_TYPE=Debug \
+-DCMAKE_INSTALL_PREFIX=$(pwd)/install \
+-DARROW_PARQUET=ON \
+-DPARQUET_REQUIRE_ENCRYPTION=ON \
+-DARROW_PYTHON=ON \
+-DARROW_COMPUTE=ON \
+-DARROW_TESTING=ON \
+-DARROW_BUILD_TESTS=ON \
+ ..
+
+ninja install -j 4
+

build.sh

@@ -0,0 +1,13 @@
+cd /arrowdev/cpp/build
+
+cmake -GNinja \
+  -DARROW_WITH_SNAPPY=ON \
+  -DCMAKE_INSTALL_PREFIX=$(pwd)/install \
+  -DARROW_PARQUET=ON \
+  -DPARQUET_REQUIRE_ENCRYPTION=ON \
+  -DARROW_COMPUTE=ON \
+  -DARROW_PYTHON=ON \
+  -DCMAKE_BUILD_TYPE=Debug \
+  ..
+ninja install -j 8
+

cpp/src/arrow/util/io_util.cc

@@ -2278,4 +2278,24 @@ Result<void*> GetSymbol(void* handle, const char* name) {
 #endif
 }
 
+Status CloseDynamicLibrary(void* handle) {
+  if (handle == nullptr) {
+    return Status::Invalid("Attempting to close null library handle");
+  }
+#ifdef _WIN32
+  if (FreeLibrary(reinterpret_cast<HMODULE>(handle))) {
+    return Status::OK();
+  }
+  // win32 api doc: "If the function fails, the return value is zero."
+  return IOErrorFromWinError(GetLastError(), "FreeLibrary() failed");
+#else
+  if (dlclose(handle) == 0) {
+    return Status::OK();
+  }
+  // dlclose(3) man page: "On success, dlclose() returns 0; on error, it returns a nonzero value."
+  auto* error = dlerror();
+  return Status::IOError("dlclose() failed: ", error ? error : "unknown error");
+#endif
+}
+
 }  // namespace arrow::internal

cpp/src/arrow/util/io_util.h

@@ -443,6 +443,13 @@ ARROW_EXPORT Result<void*> LoadDynamicLibrary(const char* path);
 ///         returned; instead an error will be raised.
 ARROW_EXPORT Result<void*> GetSymbol(void* handle, const char* name);
 
+/// \brief Close a dynamic library
+///
+/// This wraps dlclose() except on Windows, where FreeLibrary() is called.
+///
+/// \return Status::OK() if the library was closed successfully, otherwise an error is returned.
+ARROW_EXPORT Status CloseDynamicLibrary(void* handle);
+
 template <typename T>
 Result<T*> GetSymbolAs(void* handle, const char* name) {
   ARROW_ASSIGN_OR_RAISE(void* sym, GetSymbol(handle, name));