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5d41165836
Avoid using a separate list of pointer-to-pointers to the members to hold the functions. Also use a macro to actually invoke this, which will be useful when we allow having a hard-dependency on CUPS for OS X. Differential Revision: https://phabricator.services.mozilla.com/D84022
68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ex: set tabstop=8 softtabstop=4 shiftwidth=4 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 XP_MACOSX
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// TODO: On OS X we are guaranteed to have CUPS, so it would be nice to just
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// assign the members from the header directly instead of dlopen'ing.
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// Alternatively, we could just do some #define's on OS X, but we don't use
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// CUPS all that much, so there really isn't too much overhead in storing this
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// table of functions even on OS X.
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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* const 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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return false;
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}
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return true;
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}
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// This is a macro so that it could also load from libcups if we are configured
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// to use it as a compile-time dependency.
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#define CUPS_SHIM_LOAD(MEMBER, NAME) LoadCupsFunc(mCupsLib, MEMBER, #NAME)
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bool nsCUPSShim::Init() {
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MOZ_ASSERT(!mInited);
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mCupsLib = PR_LoadLibrary(gCUPSLibraryName);
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if (!mCupsLib) {
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return false;
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}
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if (!(CUPS_SHIM_LOAD(mCupsAddOption, cupsAddOption) &&
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CUPS_SHIM_LOAD(mCupsFreeDests, cupsFreeDests) &&
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CUPS_SHIM_LOAD(mCupsGetDest, cupsGetDest) &&
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CUPS_SHIM_LOAD(mCupsGetDests, cupsGetDests) &&
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CUPS_SHIM_LOAD(mCupsPrintFile, cupsPrintFile) &&
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CUPS_SHIM_LOAD(mCupsTempFd, cupsTempFd))) {
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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(mCupsLib);
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#endif
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mCupsLib = nullptr;
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return false;
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}
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mInited = true;
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return true;
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}
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