kkernel_mac.cpp

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/*
   This file is part of the KDE libraries
   Copyright (C) 2008 Benjamin Reed <rangerrick@befunk.com>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#include "kkernel_mac.h"

#include <config.h>

#ifdef Q_OS_MACX

#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/param.h>
#include <crt_externs.h>
#include <mach-o/dyld.h>

#include <CoreFoundation/CFBundle.h>
#include <CoreFoundation/CFString.h>
#include <CoreFoundation/CFURL.h>
#include <QtCore/QFile>
#include <QtCore/QProcess>
#include <QtCore/QStringList>
#include <QtCore/qvarlengtharray.h>
#include <kstandarddirs.h>
#include <ksharedconfig.h>
#include <kconfig.h>
#include <kdebug.h>

int timeout = 3000; // msec

bool dbus_initialized = false;

QString convert_CFString_to_QString(CFStringRef str) {
    CFIndex length = CFStringGetLength(str);
    const UniChar *chars = CFStringGetCharactersPtr(str);
    if (chars)
        return QString(reinterpret_cast<const QChar *>(chars), length);

    QVarLengthArray<UniChar> buffer(length);
    CFStringGetCharacters(str, CFRangeMake(0, length), buffer.data());
    return QString(reinterpret_cast<const QChar *>(buffer.constData()), length);
}

void
mac_fork_and_reexec_self()
{
    int argc = *_NSGetArgc();
    char ** argv = *_NSGetArgv();
    char * newargv[argc+2];
    char progname[PATH_MAX];
    uint32_t buflen = PATH_MAX;
    _NSGetExecutablePath(progname, &buflen);
    bool found_psn = false;

    for (int i = 0; i < argc; i++) {
        newargv[i] = argv[i];
    }

    newargv[argc] = "--nofork";
    newargv[argc+1] = NULL;

    int x_fork_result = fork();
    switch(x_fork_result) {

        case -1:
#ifndef NDEBUG
            fprintf(stderr, "Mac OS X workaround fork() failed!\n");
#endif
            ::_exit(255);
            break;

        case 0:
            // Child
            execvp(progname, newargv);
            break;

        default:
            // Parent
            _exit(0);
            break;

    }
}

bool mac_set_dbus_address(QString value)
{
    if (!value.isEmpty() && QFile::exists(value) && (QFile::permissions(value) & QFile::WriteUser)) {
        value = QLatin1String("unix:path=") + value;
        ::setenv("DBUS_SESSION_BUS_ADDRESS", value.toLocal8Bit(), 1);
        kDebug() << "set session bus address to" << value;
        return true;
    }
    return false;
}

void mac_initialize_dbus()
{
    if (dbus_initialized)
        return;

    QString dbusVar = QString::fromLocal8Bit(qgetenv("DBUS_SESSION_BUS_ADDRESS"));
    if (!dbusVar.isEmpty()) {
        dbus_initialized = true;
        return;
    }

    dbusVar = QFile::decodeName(qgetenv("DBUS_LAUNCHD_SESSION_BUS_SOCKET"));
    if (mac_set_dbus_address(dbusVar)) {
        dbus_initialized = true;
        return;
    }

    QString externalProc;
    QStringList path = QFile::decodeName(qgetenv("KDEDIRS")).split(QLatin1Char(':')).replaceInStrings(QRegExp(QLatin1String("$")), QLatin1String("/bin"));
    path << QFile::decodeName(qgetenv("PATH")).split(QLatin1Char(':')) << QLatin1String("/usr/local/bin");

    for (int i = 0; i < path.size(); ++i) {
        QString testLaunchctl = QString(path.at(i)).append(QLatin1String("/launchctl"));
        if (QFile(testLaunchctl).exists()) {
            externalProc = testLaunchctl;
            break;
        }
    }

    if (!externalProc.isEmpty()) {
                QProcess qp;
                qp.setTextModeEnabled(true);

        qp.start(externalProc, QStringList() << QLatin1String("getenv") << QLatin1String("DBUS_LAUNCHD_SESSION_BUS_SOCKET"));
                if (!qp.waitForFinished(timeout)) {
                    kDebug() << "error running" << externalProc << qp.errorString();
                    return;
                }
                if (qp.exitCode() != 0) {
                    kDebug() << externalProc << "unsuccessful:" << qp.readAllStandardError();
                    return;
                }

                QString line = QString::fromAscii(qp.readLine()).trimmed(); // read the first line
                if (mac_set_dbus_address(line))
                    dbus_initialized = true; // hooray
    }

    if (dbus_initialized == false) {
        kDebug() << "warning: unable to initialize D-Bus environment!";
    }

}

QString mac_app_filename() {
    static QString appFileName;
    if (appFileName.isEmpty()) {
        CFURLRef bundleURL = NULL;
        CFBundleRef bundle = NULL;
        CFStringRef bundlePath = NULL;

        bundle = CFBundleGetMainBundle();
        if (bundle) {
            bundleURL = CFBundleCopyBundleURL(bundle);
            bundlePath = CFURLCopyFileSystemPath(bundleURL, kCFURLPOSIXPathStyle);

            if (bundleURL) {
                CFRelease(bundleURL);
            }

            if (bundlePath) {
                appFileName = convert_CFString_to_QString(bundlePath);
                CFRelease(bundlePath);
            }
        }
    }
    return appFileName;
}

#endif