Quelle nsCUPSShim.cpp Sprache: C

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ex: set tabstop=8 softtabstop=2 shiftwidth=2 expandtab: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsDebug.h"
#include "nsString.h"
#include "nsCUPSShim.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/Logging.h"
#include "prlink.h"

#ifdef CUPS_SHIM_RUNTIME_LINK

mozilla::LazyLogModule gCupsLinkLog("CupsLink");

#  define DEBUG_LOG(...) \
    MOZ_LOG(gCupsLinkLog, mozilla::LogLevel::Debug, (__VA_ARGS__))

// TODO: This is currently pointless as we always use the compile-time linked
// version of CUPS, but in the future this may become a configure option.
// We also cannot use NSPR's library suffix support, since that cannot handle
// version number suffixes.
#  ifdef XP_MACOSX
static const char gCUPSLibraryName[] = "libcups.2.dylib";
#  else
static const char gCUPSLibraryName[] = "libcups.so.2";
#  endif

static bool LoadCupsFunc(PRLibrary* aLib, void** aDest, const char* const aName,
                         nsCUPSShim::Optional aOptional) {
  *aDest = PR_FindSymbol(aLib, aName);
  if (!*aDest) {
    DEBUG_LOG("%s not found in CUPS library", aName);
    return bool(aOptional);
  }
  return true;
}

nsCUPSShim::nsCUPSShim() {
  mCupsLib = PR_LoadLibrary(gCUPSLibraryName);
  if (!mCupsLib) {
    DEBUG_LOG("CUPS library not found");
    return;
  }

  bool success = true;

  // This is a macro so that it could also load from libcups if we are
  // configured to use it as a compile-time dependency.
  //
  // We try to load all functions even if some fail so that we get the debug log
  // unconditionally.
#  define CUPS_SHIM_LOAD(opt_, fn_) \
    success |=                      \
        LoadCupsFunc(mCupsLib, reinterpret_cast<void**>(&fn_), #fn_, opt_);
  CUPS_SHIM_ALL_FUNCS(CUPS_SHIM_LOAD)
#  undef CUPS_SHIM_LOAD

  if (!success) {
#  ifndef MOZ_TSAN
    // With TSan, we cannot unload libcups once we have loaded it because
    // TSan does not support unloading libraries that are matched from its
    // suppression list. Hence we just keep the library loaded in TSan builds.
    PR_UnloadLibrary(mCupsLib);
#  endif
    mCupsLib = nullptr;
    return;
  }

  // Set mInitOkay only if all cups functions are loaded successfully.
  mInitOkay = true;
}

#endif

quality100%

¤ Dauer der Verarbeitung: 0.16 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.