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
|
/*
* shellprocess.h - execute a process through the shell
* Program: kalarm
* Copyright © 2004-2006 by David Jarvie <software@astrojar.org.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef SHELLPROCESS_H
#define SHELLPROCESS_H
/** @file shellprocess.h - execute a process through the shell */
#include <kprocess.h>
/**
* @short Enhanced KShellProcess.
*
* The ShellProcess class runs a shell command and interprets the shell exit status
* as far as possible. It blocks execution if shell access is prohibited. It buffers
* data written to the process's stdin.
*
* Before executing any command, ShellProcess checks whether shell commands are
* allowed at all. If not (e.g. if the user is running in kiosk mode), it blocks
* execution.
*
* Derived from KShellProcess, this class additionally tries to interpret the shell
* exit status. Different shells use different exit codes. Currently, if bash or ksh
* report that the command could not be found or could not be executed, the NOT_FOUND
* status is returned.
*
* Writes to the process's stdin are buffered, so that unlike with KShellProcess, there
* is no need to wait for the write to complete before writing again.
*
* @author David Jarvie <software@astrojar.org.uk>
*/
class ShellProcess : public KShellProcess
{
Q_OBJECT
public:
/** Current status of the shell process.
* @li INACTIVE - start() has not yet been called to run the command.
* @li RUNNING - the command is currently running.
* @li SUCCESS - the command appears to have exited successfully.
* @li UNAUTHORISED - shell commands are not authorised for this user.
* @li DIED - the command didn't exit cleanly, i.e. was killed or died.
* @li NOT_FOUND - the command was either not found or not executable.
* @li START_FAIL - the command couldn't be started for other reasons.
*/
enum Status {
INACTIVE, // start() has not yet been called to run the command
RUNNING, // command is currently running
SUCCESS, // command appears to have exited successfully
UNAUTHORISED, // shell commands are not authorised for this user
DIED, // command didn't exit cleanly, i.e. was killed or died
NOT_FOUND, // command either not found or not executable
START_FAIL // command couldn't be started for other reasons
};
/** Constructor.
* @param command The command line to be run when start() is called.
*/
explicit ShellProcess(const TQString& command);
/** Executes the configured command.
* @param comm Which communication links should be established to the child process
* (stdin/stdout/stderr).
*/
bool start(Communication comm = NoCommunication);
/** Returns the current status of the shell process. */
Status status() const { return mStatus; }
/** Returns whether the command was run successfully.
* @return True if the command has been run and appears to have exited successfully.
*/
bool normalExit() const { return mStatus == SUCCESS; }
/** Returns the command configured to be run. */
const TQString& command() const { return mCommand; }
/** Returns the error message corresponding to the command exit status.
* @return Error message if an error occurred. Null string if the command has not yet
* exited, or if the command ran successfully.
*/
TQString errorMessage() const;
/** Writes a string to the process's STDIN. */
void writeStdin(const char* buffer, int bufflen);
/** Tell the process to exit once any outstanding STDIN strings have been written. */
void stdinExit();
/** Returns whether the user is authorised to run shell commands. Shell commands may
* be prohibited in kiosk mode, for example.
*/
static bool authorised();
/** Determines which shell to use.
* @return file name of shell, excluding path.
*/
static const TQCString& shellName() { shellPath(); return mShellName; }
/** Determines which shell to use.
* @return path name of shell.
*/
static const TQCString& shellPath();
signals:
/** Signal emitted when the shell process execution completes. It is not emitted
* if start() did not attempt to start the command execution, e.g. in kiosk mode.
*/
void shellExited(ShellProcess*);
private slots:
void writtenStdin(KProcess*);
void slotExited(KProcess*);
private:
// Prohibit the following inherited methods
ShellProcess& operator<<(const TQString&);
ShellProcess& operator<<(const TQCString&);
ShellProcess& operator<<(const TQStringList&);
ShellProcess& operator<<(const char*);
static TQCString mShellName; // name of shell to be used
static TQCString mShellPath; // path of shell to be used
static bool mInitialised; // true once static data has been initialised
static bool mAuthorised; // true if shell commands are authorised
TQString mCommand; // copy of command to be executed
TQValueList<TQCString> mStdinQueue; // queued strings to send to STDIN
Status mStatus; // current execution status
bool mStdinExit; // exit once STDIN queue has been written
};
#endif // SHELLPROCESS_H
|
