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1 | /********************************************************************** | ||
2 | ** Copyright (C) 2000 Trolltech AS. All rights reserved. | ||
3 | ** | ||
4 | ** This file is part of Qtopia Environment. | ||
5 | ** | ||
6 | ** This file may be distributed and/or modified under the terms of the | ||
7 | ** GNU General Public License version 2 as published by the Free Software | ||
8 | ** Foundation and appearing in the file LICENSE.GPL included in the | ||
9 | ** packaging of this file. | ||
10 | ** | ||
11 | ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE | ||
12 | ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | ||
13 | ** | ||
14 | ** See http://www.trolltech.com/gpl/ for GPL licensing information. | ||
15 | ** | ||
16 | ** Contact info@trolltech.com if any conditions of this licensing are | ||
17 | ** not clear to you. | ||
18 | ** | ||
19 | **********************************************************************/ | ||
20 | |||
21 | #include "qcopenvelope_qws.h" | ||
22 | #include "global.h" | ||
23 | #include <qbuffer.h> | ||
24 | #include <qdatastream.h> | ||
25 | #include <qfile.h> | ||
26 | #include <unistd.h> | ||
27 | #include <errno.h> | ||
28 | #include <sys/file.h> | ||
29 | #include <sys/types.h> | ||
30 | #include <sys/stat.h> | ||
31 | #include <time.h> | ||
32 | |||
33 | #ifndef QT_NO_COP | ||
34 | |||
35 | /*! | ||
36 | \class QCopEnvelope qcopenvelope_qws.h | ||
37 | \brief The QCopEnvelope class encapsulates QCop message sending. | ||
38 | |||
39 | QCop messages allow applications to communicate with each other. | ||
40 | These messages are send using QCopEnvelope, and received by connecting | ||
41 | to a QCopChannel. | ||
42 | |||
43 | To send a message, use the following protocol: | ||
44 | |||
45 | \code | ||
46 | QCopEnvelope e(channelname, messagename); | ||
47 | e << parameter1 << parameter2 << ...; | ||
48 | \endcode | ||
49 | |||
50 | For messages without parameters, you can simply use: | ||
51 | |||
52 | \code | ||
53 | QCopEnvelope (channelname, messagename); | ||
54 | \endcode | ||
55 | |||
56 | Do not try to simplify further as some compilers may not do | ||
57 | as you expect. | ||
58 | |||
59 | The <tt>channelname</tt> of channels within Qtopia all start with "QPE/". | ||
60 | The <tt>messagename</tt> is a function identifier followed by a list of types | ||
61 | in parentheses. There are no spaces in the message name. | ||
62 | |||
63 | To receive a message, you will generally just use your applications | ||
64 | predefined QPE/Application/<i>appname</i> channel | ||
65 | (see QPEApplication::appMessage()), but you can make another channel | ||
66 | and connect it to a slot with: | ||
67 | |||
68 | \code | ||
69 | myChannel = new QCopChannel( "QPE/FooBar", this ); | ||
70 | connect( myChannel, SIGNAL(received(const QCString &, const QByteArray &)), | ||
71 | this, SLOT(fooBarMessage( const QCString &, const QByteArray &)) ); | ||
72 | \endcode | ||
73 | |||
74 | See also, the \link qcop.html list of Qtopia messages\endlink. | ||
75 | */ | ||
76 | |||
77 | /*! | ||
78 | Constructs a QCopEnvelope that will write \a message to \a channel. | ||
79 | If \a message has parameters, you must then user operator<<() to | ||
80 | write the parameters. | ||
81 | */ | ||
82 | QCopEnvelope::QCopEnvelope( const QCString& channel, const QCString& message ) : | ||
83 | QDataStream(new QBuffer), | ||
84 | ch(channel), msg(message) | ||
85 | { | ||
86 | device()->open(IO_WriteOnly); | ||
87 | } | ||
88 | |||
89 | /*! | ||
90 | Writes the completed message and destroys the QCopEnvelope. | ||
91 | */ | ||
92 | QCopEnvelope::~QCopEnvelope() | ||
93 | { | ||
94 | QByteArray data = ((QBuffer*)device())->buffer(); | ||
95 | const int pref=16; | ||
96 | if ( qstrncmp(ch.data(),"QPE/Application/",pref)==0 ) { | ||
97 | QString qcopfn("/tmp/qcop-msg-"); | ||
98 | qcopfn += ch.mid(pref); | ||
99 | QFile qcopfile(qcopfn); | ||
100 | |||
101 | if ( qcopfile.open(IO_WriteOnly | IO_Append) ) { | ||
102 | if(flock(qcopfile.handle(), LOCK_EX)) { | ||
103 | /* some error occured */ | ||
104 | qWarning(QString("Failed to obtain file lock on %1 (%2)") | ||
105 | .arg(qcopfn).arg( errno )); | ||
106 | } | ||
107 | /* file locked, but might be stale (e.g. program for whatever | ||
108 | reason did not start). I modified more than 1 minute ago, | ||
109 | truncate the file */ | ||
110 | struct stat buf; | ||
111 | time_t t; | ||
112 | if (!fstat(qcopfile.handle(), &buf) && (time(&t) != (time_t)-1) ) { | ||
113 | // success on fstat, lets compare times | ||
114 | if (buf.st_mtime + 60 < t) { | ||
115 | qWarning("stale file " + qcopfn + " found. Truncating"); | ||
116 | ftruncate(qcopfile.handle(), 0); | ||
117 | qcopfile.reset(); | ||
118 | } | ||
119 | } | ||
120 | |||
121 | if ( !QCopChannel::isRegistered(ch) ) { | ||
122 | int fsize = qcopfile.size(); | ||
123 | { | ||
124 | QDataStream ds(&qcopfile); | ||
125 | ds << ch << msg << data; | ||
126 | flock(qcopfile.handle(), LOCK_UN); | ||
127 | qcopfile.close(); | ||
128 | } | ||
129 | |||
130 | if (fsize == 0) { | ||
131 | QString cmd = ch.mid(pref); | ||
132 | cmd += " -qcop " + qcopfn; | ||
133 | Global::invoke(cmd); | ||
134 | } | ||
135 | |||
136 | char c; | ||
137 | for (int i=0; (c=msg[i]); i++) { | ||
138 | if ( c == ' ' ) { | ||
139 | // Return-value required | ||
140 | // ###### wait for it | ||
141 | break; | ||
142 | } else if ( c == '(' ) { | ||
143 | // No return value | ||
144 | break; | ||
145 | } | ||
146 | } | ||
147 | goto end; | ||
148 | } // endif isRegisterd | ||
149 | flock(qcopfile.handle(), LOCK_UN); | ||
150 | qcopfile.close(); | ||
151 | qcopfile.remove(); | ||
152 | } else { | ||
153 | qWarning(QString("Failed to obtain file lock on %1") | ||
154 | .arg(qcopfn)); | ||
155 | } // endif open | ||
156 | } | ||
157 | QCopChannel::send(ch,msg,data); | ||
158 | end: | ||
159 | delete device(); | ||
160 | } | ||
161 | |||
162 | #endif | ||