1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/*
This file is part of the KDE libraries
Copyright (c) 1999 Waldo Bastian <bastian@kde.org>
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.
*/
#ifndef _KTEMPFILE_H_
#define _KTEMPFILE_H_
#include <tqstring.h>
#include <stdio.h>
#include <errno.h>
#include "tdelibs_export.h"
class TQFile;
class TQTextStream;
class TQDataStream;
class KSaveFile;
class KTempFilePrivate;
/**
* The KTempFile class creates and opens a unique file for temporary use.
*
* This is especially useful if you need to create a file in a world
* writable directory like /tmp without being vulnerable to so called
* symlink attacks.
*
* KDE applications, however, shouldn't create files in /tmp in the first
* place but use the "tmp" resource instead. The standard KTempFile
* constructor will do that by default.
*
* To create a temporary file that starts with a certain name
* in the "tmp" resource, one should use:
* KTempFile(locateLocal("tmp", prefix), extension);
*
* KTempFile does not create any missing directories, but locateLocal() does.
*
* See also TDEStandardDirs
*
* @author Waldo Bastian <bastian@kde.org>
*/
class TDECORE_EXPORT KTempFile
{
friend class KSaveFile;
public:
/**
* Creates a temporary file with the name:
* \<filePrefix>\<six letters>\<fileExtension>
*
* The default @p filePrefix is "$TDEHOME/tmp-$HOST/appname/"
* The default @p fileExtension is ".tmp"
* @param filePrefix the prefix of the file name, or TQString::null
* for the default value
* @param fileExtension the extension of the prefix, or TQString::null for the
* default value
* @param mode the file permissions
**/
KTempFile(TQString filePrefix=TQString::null,
TQString fileExtension=TQString::null,
int mode = 0600 );
/**
* The destructor closes the file.
* If autoDelete is enabled the file gets unlinked as well.
**/
~KTempFile();
/**
* Turn automatic deletion on or off.
* Automatic deletion is off by default.
* @param autoDelete true to turn automatic deletion on
**/
void setAutoDelete(bool autoDelete) { bAutoDelete = autoDelete; }
/**
* Returns the status of the file based on errno. (see errno.h)
* 0 means OK.
*
* You should check the status after object creation to check
* whether a file could be created in the first place.
*
* You may check the status after closing the file to verify that
* the file has indeed been written correctly.
* @return the errno status, 0 means ok
**/
int status() const;
/**
* Returns the full path and name of the file.
*
* Note that in most circumstances the file needs to be closed
* before you use it by name.
*
* In particular, if another process or software part needs to write data
* to the file based on the filename, the file should be closed before doing
* so. Otherwise the act of closing the file later on may cause the file to
* get truncated to a zero-size, resulting in an unexpected loss of the data.
*
* In some cases there is only interest in the filename itself but where the
* actual presence of a file with such name is a problem. In that case the
* file should first be both closed and unlinked. Such usage is not recommended
* since it may lead to the kind of symlink vulnerabilities that the KTempFile
* design attempts to prevent.
*
* @return The name of the file, or TQString::null if opening the
* file has failed or the file has been unlinked already.
**/
TQString name() const;
/**
* An integer file descriptor open for writing to the file
* @return The file descriptor, or a negative number if opening
* the file failed
**/
int handle() const;
/**
* Returns the FILE* of the temporary file.
* @return FILE* stream open for writing to the file, or 0
* if opening the file failed
**/
FILE *fstream();
/**
* Returns the TQTextStream for writing.
* @return TQTextStream open for writing to the file, or 0
* if opening the file failed
**/
TQTextStream *textStream();
/**
* Returns a TQDataStream for writing.
* @return TQDataStream open for writing to the file, or 0
* if opening the file failed
**/
TQDataStream *dataStream();
/**
* Returns a TQFile.
* @return A TQFile open for writing to the file, or 0 if
* opening the file failed.
**/
TQFile *file();
/**
* Unlinks the file from the directory. The file is
* deleted once the last reader/writer closes it.
**/
void unlink();
/**
* Flushes file to disk (fsync).
*
* If you want to be as sure as possible that the file data has
* actually been physically stored on disk you need to call sync().
*
* See status() for details about errors.
* @return true if successful, or false if an error has occurred.
* @since 3.3
**/
bool sync();
/**
* Closes the file.
*
* See status() for details about errors.
* @return true if successful, or false if an error has occurred.
**/
bool close();
protected:
/**
* Constructor used by KSaveFile
**/
KTempFile(bool);
/**
* @internal
* Create function used internally by KTempFile and KSaveFile
**/
bool create(const TQString &filePrefix,
const TQString &fileExtension, int mode);
void setError(int error) { mError = error; }
private:
int mError;
TQString mTmpName;
int mFd;
FILE *mStream;
TQFile *mFile;
TQTextStream *mTextStream;
TQDataStream *mDataStream;
bool bOpen;
bool bAutoDelete;
KTempFilePrivate *d;
};
#endif
|
