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65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ex: set tabstop=8 softtabstop=2 shiftwidth=2 expandtab: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsDebug.h"
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#include "nsString.h"
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#include "nsCUPSShim.h"
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#include "mozilla/ArrayUtils.h"
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#include "prlink.h"
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#ifdef CUPS_SHIM_RUNTIME_LINK
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// TODO: This is currently pointless as we always use the compile-time linked
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// version of CUPS, but in the future this may become a configure option.
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// We also cannot use NSPR's library suffix support, since that cannot handle
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// version number suffixes.
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# ifdef XP_MACOSX
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static const char gCUPSLibraryName[] = "libcups.2.dylib";
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# else
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static const char gCUPSLibraryName[] = "libcups.so.2";
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# endif
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template <typename FuncT>
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static bool LoadCupsFunc(PRLibrary*& lib, FuncT*& dest,
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const char* const name) {
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dest = (FuncT*)PR_FindSymbol(lib, name);
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if (MOZ_UNLIKELY(!dest)) {
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# ifdef DEBUG
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nsAutoCString msg(name);
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msg.AppendLiteral(" not found in CUPS library");
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NS_WARNING(msg.get());
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# endif
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# ifndef MOZ_TSAN
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// With TSan, we cannot unload libcups once we have loaded it because
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// TSan does not support unloading libraries that are matched from its
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// suppression list. Hence we just keep the library loaded in TSan builds.
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PR_UnloadLibrary(lib);
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# endif
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lib = nullptr;
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return false;
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}
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return true;
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}
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nsCUPSShim::nsCUPSShim() {
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mCupsLib = PR_LoadLibrary(gCUPSLibraryName);
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if (!mCupsLib) {
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return;
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}
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// This is a macro so that it could also load from libcups if we are
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// configured to use it as a compile-time dependency.
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# define CUPS_SHIM_LOAD(NAME) \
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if (!LoadCupsFunc(mCupsLib, NAME, #NAME)) return;
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CUPS_SHIM_ALL_FUNCS(CUPS_SHIM_LOAD)
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# undef CUPS_SHIM_LOAD
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// Set mInitOkay only if all cups functions are loaded successfully.
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mInitOkay = true;
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}
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#endif
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