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/*
* 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
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