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/**********************************************************************
** Copyright (C) 2000 Trolltech AS. All rights reserved.
**
** This file is part of Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#include "qcopenvelope_qws.h"
#include "global.h"
#include <qbuffer.h>
#include <qdatastream.h>
#include <qfile.h>
#include <unistd.h>
#include <errno.h>
#include <sys/file.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#ifndef QT_NO_COP
/*!
\class QCopEnvelope qcopenvelope_qws.h
\brief The QCopEnvelope class encapsulates QCop message sending.
QCop messages allow applications to communicate with each other.
These messages are send using QCopEnvelope, and received by connecting
to a QCopChannel.
To send a message, use the following protocol:
\code
QCopEnvelope e(channelname, messagename);
e << parameter1 << parameter2 << ...;
\endcode
For messages without parameters, you can simply use:
\code
QCopEnvelope (channelname, messagename);
\endcode
Do not try to simplify further as some compilers may not do
as you expect.
The <tt>channelname</tt> of channels within Qtopia all start with "QPE/".
The <tt>messagename</tt> is a function identifier followed by a list of types
in parentheses. There are no spaces in the message name.
To receive a message, you will generally just use your applications
predefined QPE/Application/<i>appname</i> channel
(see QPEApplication::appMessage()), but you can make another channel
and connect it to a slot with:
\code
myChannel = new QCopChannel( "QPE/FooBar", this );
connect( myChannel, SIGNAL(received(const QCString &, const QByteArray &)),
this, SLOT(fooBarMessage( const QCString &, const QByteArray &)) );
\endcode
See also, the \link qcop.html list of Qtopia messages\endlink.
*/
/*!
Constructs a QCopEnvelope that will write \a message to \a channel.
If \a message has parameters, you must then user operator<<() to
write the parameters.
*/
QCopEnvelope::QCopEnvelope( const QCString& channel, const QCString& message ) :
QDataStream(new QBuffer),
ch(channel), msg(message)
{
device()->open(IO_WriteOnly);
}
/*!
Writes the completed message and destroys the QCopEnvelope.
*/
QCopEnvelope::~QCopEnvelope()
{
QByteArray data = ((QBuffer*)device())->buffer();
const int pref=16;
if ( qstrncmp(ch.data(),"QPE/Application/",pref)==0 ) {
QString qcopfn("/tmp/qcop-msg-");
qcopfn += ch.mid(pref);
QFile qcopfile(qcopfn);
if ( qcopfile.open(IO_WriteOnly | IO_Append) ) {
if(flock(qcopfile.handle(), LOCK_EX)) {
/* some error occured */
qWarning(QString("Failed to obtain file lock on %1 (%2)")
.arg(qcopfn).arg( errno ));
}
/* file locked, but might be stale (e.g. program for whatever
reason did not start). I modified more than 1 minute ago,
truncate the file */
struct stat buf;
time_t t;
if (!fstat(qcopfile.handle(), &buf) && (time(&t) != (time_t)-1) ) {
// success on fstat, lets compare times
if (buf.st_mtime + 60 < t) {
qWarning("stale file " + qcopfn + " found. Truncating");
ftruncate(qcopfile.handle(), 0);
qcopfile.reset();
}
}
if ( !QCopChannel::isRegistered(ch) ) {
int fsize = qcopfile.size();
{
QDataStream ds(&qcopfile);
ds << ch << msg << data;
flock(qcopfile.handle(), LOCK_UN);
qcopfile.close();
}
if (fsize == 0) {
QString cmd = ch.mid(pref);
cmd += " -qcop " + qcopfn;
Global::invoke(cmd);
}
char c;
for (int i=0; (c=msg[i]); i++) {
if ( c == ' ' ) {
// Return-value required
// ###### wait for it
break;
} else if ( c == '(' ) {
// No return value
break;
}
}
goto end;
} // endif isRegisterd
flock(qcopfile.handle(), LOCK_UN);
qcopfile.close();
qcopfile.remove();
} else {
qWarning(QString("Failed to obtain file lock on %1")
.arg(qcopfn));
} // endif open
}
QCopChannel::send(ch,msg,data);
end:
delete device();
}
#endif
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