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35986ca9d6
Differential Revision: https://phabricator.services.mozilla.com/D61569 --HG-- extra : moz-landing-system : lando
53 lines
1.8 KiB
C++
53 lines
1.8 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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// List of symbols to find in libcups. Must match symAddr[] defined in Init().
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// Making this an array of arrays instead of pointers allows storing the
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// whole thing in read-only memory.
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static const char gSymName[][sizeof("cupsPrintFile")] = {
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{"cupsAddOption"}, {"cupsFreeDests"}, {"cupsGetDest"},
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{"cupsGetDests"}, {"cupsPrintFile"}, {"cupsTempFd"},
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};
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static const int gSymNameCt = mozilla::ArrayLength(gSymName);
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bool nsCUPSShim::Init() {
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mCupsLib = PR_LoadLibrary("libcups.so.2");
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if (!mCupsLib) return false;
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// List of symbol pointers. Must match gSymName[] defined above.
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void** symAddr[] = {
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(void**)&mCupsAddOption, (void**)&mCupsFreeDests, (void**)&mCupsGetDest,
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(void**)&mCupsGetDests, (void**)&mCupsPrintFile, (void**)&mCupsTempFd,
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};
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for (int i = gSymNameCt; i--;) {
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*(symAddr[i]) = PR_FindSymbol(mCupsLib, gSymName[i]);
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if (!*(symAddr[i])) {
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#ifdef DEBUG
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nsAutoCString msg(gSymName[i]);
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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(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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}
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return true;
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}
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