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/* vi: ts=8 sts=4 sw=4
*
* $Id$
*
* This file is part of the KDE project, module tdesu.
* Copyright (C) 1999,2000 Geert Jansen <jansen@kde.org>
*
* This is free software; you can use this library under the GNU Library
* General Public License, version 2. See the file "COPYING.LIB" for the
* exact licensing terms.
*/
#ifndef __Process_h_Included__
#define __Process_h_Included__
#include <sys/types.h>
#include <tqcstring.h>
#include <tqstring.h>
#include <tqstringlist.h>
#include <tqvaluelist.h>
#include <tdelibs_export.h>
class PTY;
typedef TQValueList<TQCString> QCStringList;
/**
* Synchronous communication with tty programs.
*
* PtyProcess provides synchronous communication with tty based programs.
* The communications channel used is a pseudo tty (as opposed to a pipe)
* This means that programs which require a terminal will work.
*/
class TDESU_EXPORT PtyProcess
{
public:
PtyProcess();
virtual ~PtyProcess();
/**
* Forks off and execute a command. The command's standard in and output
* are connected to the pseudo tty. They are accessible with readLine
* and writeLine.
* @param command The command to execute.
* @param args The arguments to the command.
*/
int exec(const TQCString &command, const QCStringList &args);
/**
* Reads a line from the program's standard out. Depending on the @em block
* parameter, this call blocks until a single, full line is read.
* @param block Block until a full line is read?
* @return The output string.
*/
TQCString readLine(bool block=true);
/**
* Read all available output from the program's standard out.
* @param block If no output is in the buffer, should the function block
* @return The output.
*/
TQCString readAll(bool block=true);
/**
* Writes a line of text to the program's standard in.
* @param line The text to write.
* @param addNewline Adds a '\n' to the line.
*/
void writeLine(const TQCString &line, bool addNewline=true);
/**
* Puts back a line of input.
* @param line The line to put back.
* @param addNewline Adds a '\n' to the line.
*/
void unreadLine(const TQCString &line, bool addNewline=true);
/**
* Sets the exit string. If a line of program output matches this,
* waitForChild() will terminate the program and return.
*/
void setExitString(const TQCString &exit) { m_Exit = exit; }
/**
* Waits for the child to exit. See also setExitString.
*/
int waitForChild();
/**
* Waits until the pty has cleared the ECHO flag. This is useful
* when programs write a password prompt before they disable ECHO.
* Disabling it might flush any input that was written.
*/
int WaitSlave();
/**
* Enables/disables local echo on the pseudo tty.
*/
int enableLocalEcho(bool enable=true);
/**
* Enables/disables terminal output. Relevant only to some subclasses.
*/
void setTerminal(bool terminal) { m_bTerminal = terminal; }
/**
* Overwrites the password as soon as it is used. Relevant only to
* some subclasses.
*/
void setErase(bool erase) { m_bErase = erase; }
/**
* Set additinal environment variables.
*/
void setEnvironment( const QCStringList &env );
/**
* Returns the filedescriptor of the process.
*/
int fd() {return m_Fd;}
/**
* Returns the pid of the process.
*/
int pid() {return m_Pid;}
public: /* static */
/*
** This is a collection of static functions that can be
** used for process control inside tdesu. I'd suggest
** against using this publicly. There are probably
** nicer Qt based ways to do what you want.
*/
/**
** Wait @p ms miliseconds (ie. 1/10th of a second is 100ms),
** using @p fd as a filedescriptor to wait on. Returns
** select(2)'s result, which is -1 on error, 0 on timeout,
** or positive if there is data on one of the selected fd's.
**
** @p ms must be in the range 0..999 (ie. the maximum wait
** duration is 999ms, almost one second).
*/
static int waitMS(int fd,int ms);
/**
** Basic check for the existence of @p pid.
** Returns true iff @p pid is an extant process,
** (one you could kill - see man kill(2) for signal 0).
*/
static bool checkPid(pid_t pid);
/**
** Check process exit status for process @p pid.
** On error (no child, no exit), return -1.
** If child @p pid has exited, return its exit status,
** (which may be zero).
** If child @p has not exited, return -2.
*/
enum checkPidStatus { Error=-1, NotExited=-2, Killed=-3 } ;
static int checkPidExited(pid_t pid);
protected:
const QCStringList& environment() const;
bool m_bErase, m_bTerminal;
int m_Pid, m_Fd;
TQCString m_Command, m_Exit;
private:
int init();
int SetupTTY(int fd);
PTY *m_pPTY;
TQCString m_Inbuf, m_TTY;
protected:
virtual void virtual_hook( int id, void* data );
private:
class PtyProcessPrivate;
PtyProcessPrivate *d;
};
#endif
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