| -rw-r--r-- | libopie/oprocess.h | 747 |
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diff --git a/libopie/oprocess.h b/libopie/oprocess.h deleted file mode 100644 index af7cddb..0000000 --- a/libopie/oprocess.h +++ b/dev/null @@ -1,747 +0,0 @@ -/* This file is part of the KDE libraries - Copyright (C) 1997 Christian Czezakte (e9025461@student.tuwien.ac.at) - - This library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public - License as published by the Free Software Foundation; either - version 2 of the License, or (at your option) any later version. - - 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., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. -*/ -// -// KPROCESS -- A class for handling child processes in KDE without -// having to take care of Un*x specific implementation details -// -// version 0.3.1, Jan 8th 1998 -// -// (C) Christian Czezatke -// e9025461@student.tuwien.ac.at -// Ported by Holger Freyther to the Open Palmtop Integrated Environment -// - -#ifndef __kprocess_h__ -#define __kprocess_h__ - -#include <sys/types.h> // for pid_t -#include <sys/wait.h> -#include <signal.h> -#include <unistd.h> -#include <qvaluelist.h> -#include <qcstring.h> -#include <qobject.h> - -class QSocketNotifier; -class OProcessPrivate; - -/** - * Child process invocation, monitoring and control. - * - * @sect General usage and features - * - *This class allows a KDE and OPIE application to start child processes without having - *to worry about UN*X signal handling issues and zombie process reaping. - * - *@see KProcIO - * - *Basically, this class distinguishes three different ways of running - *child processes: - * - *@li OProcess::DontCare -- The child process is invoked and both the child - *process and the parent process continue concurrently. - * - *Starting a DontCare child process means that the application is - *not interested in any notification to determine whether the - *child process has already exited or not. - * - *@li OProcess::NotifyOnExit -- The child process is invoked and both the - *child and the parent process run concurrently. - * - *When the child process exits, the OProcess instance - *corresponding to it emits the Qt signal @ref processExited(). - * - *Since this signal is @em not emitted from within a UN*X - *signal handler, arbitrary function calls can be made. - * - *Be aware: When the OProcess objects gets destructed, the child - *process will be killed if it is still running! - *This means in particular, that you cannot use a OProcess on the stack - *with OProcess::NotifyOnExit. - * - *@li OProcess::Block -- The child process starts and the parent process - *is suspended until the child process exits. (@em Really not recommended - *for programs with a GUI.) - * - *OProcess also provides several functions for determining the exit status - *and the pid of the child process it represents. - * - *Furthermore it is possible to supply command-line arguments to the process - *in a clean fashion (no null -- terminated stringlists and such...) - * - *A small usage example: - *<pre> - *OProcess *proc = new OProcess; - * - **proc << "my_executable"; - **proc << "These" << "are" << "the" << "command" << "line" << "args"; - *QApplication::connect(proc, SIGNAL(processExited(OProcess *)), - * pointer_to_my_object, SLOT(my_objects_slot(OProcess *))); - *proc->start(); - *</pre> - * - *This will start "my_executable" with the commandline arguments "These"... - * - *When the child process exits, the respective Qt signal will be emitted. - * - *@sect Communication with the child process - * - *OProcess supports communication with the child process through - *stdin/stdout/stderr. - * - *The following functions are provided for getting data from the child - *process or sending data to the child's stdin (For more information, - *have a look at the documentation of each function): - * - *@li bool @ref writeStdin(char *buffer, int buflen); - *@li -- Transmit data to the child process's stdin. - * - *@li bool @ref closeStdin(); - *@li -- Closes the child process's stdin (which causes it to see an feof(stdin)). - *Returns false if you try to close stdin for a process that has been started - *without a communication channel to stdin. - * - *@li bool @ref closeStdout(); - *@li -- Closes the child process's stdout. - *Returns false if you try to close stdout for a process that has been started - *without a communication channel to stdout. - * - *@li bool @ref closeStderr(); - *@li -- Closes the child process's stderr. - *Returns false if you try to close stderr for a process that has been started - *without a communication channel to stderr. - * - * - *@sect QT signals: - * - *@li void @ref receivedStdout(OProcess *proc, char *buffer, int buflen); - *@li void @ref receivedStderr(OProcess *proc, char *buffer, int buflen); - *@li -- Indicates that new data has arrived from either the - *child process's stdout or stderr. - * - *@li void @ref wroteStdin(OProcess *proc); - *@li -- Indicates that all data that has been sent to the child process - *by a prior call to @ref writeStdin() has actually been transmitted to the - *client . - * - *@author Christian Czezakte e9025461@student.tuwien.ac.at - * - * - **/ -class OProcess : public QObject -{ - Q_OBJECT - -public: - - /** - * Modes in which the communication channel can be opened. - * - * If communication for more than one channel is required, - * the values have to be or'ed together, for example to get - * communication with stdout as well as with stdin, you would - * specify @p Stdin @p | @p Stdout - * - * If @p NoRead is specified in conjunction with @p Stdout, - * no data is actually read from @p Stdout but only - * the signal @ref childOutput(int fd) is emitted. - */ - enum Communication { NoCommunication = 0, Stdin = 1, Stdout = 2, Stderr = 4, - AllOutput = 6, All = 7, - NoRead }; - - /** - * Run-modes for a child process. - */ - enum RunMode { - /** - * The application does not receive notifications from the subprocess when - * it is finished or aborted. - */ - DontCare, - /** - * The application is notified when the subprocess dies. - */ - NotifyOnExit, - /** - * The application is suspended until the started process is finished. - */ - Block }; - - /** - * Constructor - */ - OProcess(QObject *parent = 0, const char *name = 0); - /** - * Constructor - */ - OProcess(const QString &arg0, QObject *parent = 0, const char *name = 0); - /** - * Constructor - */ - OProcess(const QStringList &args, QObject *parent = 0, const char *name = 0); - - /** - *Destructor: - * - * If the process is running when the destructor for this class - * is called, the child process is killed with a SIGKILL, but - * only if the run mode is not of type @p DontCare. - * Processes started as @p DontCare keep running anyway. - */ - virtual ~OProcess(); - - /** - @deprecated - - The use of this function is now deprecated. -- Please use the - "operator<<" instead of "setExecutable". - - Sets the executable to be started with this OProcess object. - Returns false if the process is currently running (in that - case the executable remains unchanged.) - - @see operator<< - - */ - bool setExecutable(const QString& proc); - - - /** - * Sets the executable and the command line argument list for this process. - * - * For example, doing an "ls -l /usr/local/bin" can be achieved by: - * <pre> - * OProcess p; - * ... - * p << "ls" << "-l" << "/usr/local/bin" - * </pre> - * - **/ - OProcess &operator<<(const QString& arg); - /** - * Similar to previous method, takes a char *, supposed to be in locale 8 bit already. - */ - OProcess &operator<<(const char * arg); - /** - * Similar to previous method, takes a QCString, supposed to be in locale 8 bit already. - */ - OProcess &operator<<(const QCString & arg); - - /** - * Sets the executable and the command line argument list for this process, - * in a single method call, or add a list of arguments. - **/ - OProcess &operator<<(const QStringList& args); - - /** - * Clear a command line argument list that has been set by using - * the "operator<<". - */ - void clearArguments(); - - /** - * Starts the process. - * For a detailed description of the - * various run modes and communication semantics, have a look at the - * general description of the OProcess class. - * - * The following problems could cause this function to - * return false: - * - * @li The process is already running. - * @li The command line argument list is empty. - * @li The starting of the process failed (could not fork). - * @li The executable was not found. - * - * @param comm Specifies which communication links should be - * established to the child process (stdin/stdout/stderr). By default, - * no communication takes place and the respective communication - * signals will never get emitted. - * - * @return true on success, false on error - * (see above for error conditions) - **/ - virtual bool start(RunMode runmode = NotifyOnExit, - Communication comm = NoCommunication); - - /** - * Stop the process (by sending it a signal). - * - * @param signo The signal to send. The default is SIGTERM. - * @return @p true if the signal was delivered successfully. - */ - virtual bool kill(int signo = SIGTERM); - - /** - @return @p true if the process is (still) considered to be running - */ - bool isRunning() const; - - /** Returns the process id of the process. - * - * If it is called after - * the process has exited, it returns the process id of the last - * child process that was created by this instance of OProcess. - * - * Calling it before any child process has been started by this - * OProcess instance causes pid() to return 0. - **/ - pid_t pid() const; - - /** - * Suspend processing of data from stdout of the child process. - */ - void suspend(); - - /** - * Resume processing of data from stdout of the child process. - */ - void resume(); - - /** - * @return @p true if the process has already finished and has exited - * "voluntarily", ie: it has not been killed by a signal. - * - * Note that you should check @ref OProcess::exitStatus() to determine - * whether the process completed its task successful or not. - */ - bool normalExit() const; - - /** - * Returns the exit status of the process. - * - * Please use - * @ref OProcess::normalExit() to check whether the process has exited - * cleanly (i.e., @ref OProcess::normalExit() returns @p true) before calling - * this function because if the process did not exit normally, - * it does not have a valid exit status. - */ - int exitStatus() const; - - - /** - * Transmit data to the child process's stdin. - * - * OProcess::writeStdin may return false in the following cases: - * - * @li The process is not currently running. - * - * @li Communication to stdin has not been requested in the @ref start() call. - * - * @li Transmission of data to the child process by a previous call to - * @ref writeStdin() is still in progress. - * - * Please note that the data is sent to the client asynchronously, - * so when this function returns, the data might not have been - * processed by the child process. - * - * If all the data has been sent to the client, the signal - * @ref wroteStdin() will be emitted. - * - * Please note that you must not free "buffer" or call @ref writeStdin() - * again until either a @ref wroteStdin() signal indicates that the - * data has been sent or a @ref processHasExited() signal shows that - * the child process is no longer alive... - **/ - bool writeStdin(const char *buffer, int buflen); - - void flushStdin(); - - /** - * This causes the stdin file descriptor of the child process to be - * closed indicating an "EOF" to the child. - * - * @return @p false if no communication to the process's stdin - * had been specified in the call to @ref start(). - */ - bool closeStdin(); - - /** - * This causes the stdout file descriptor of the child process to be - * closed. - * - * @return @p false if no communication to the process's stdout - * had been specified in the call to @ref start(). - */ - bool closeStdout(); - - /** - * This causes the stderr file descriptor of the child process to be - * closed. - * - * @return @p false if no communication to the process's stderr - * had been specified in the call to @ref start(). - */ - bool closeStderr(); - - /** - * Lets you see what your arguments are for debugging. - */ - - const QValueList<QCString> &args() { return arguments; } - - /** - * Controls whether the started process should drop any - * setuid/segid privileges or whether it should keep them - * - * The default is @p false : drop privileges - */ - void setRunPrivileged(bool keepPrivileges); - - /** - * Returns whether the started process will drop any - * setuid/segid privileges or whether it will keep them - */ - bool runPrivileged() const; - - /** - * Modifies the environment of the process to be started. - * This function must be called before starting the process. - */ - void setEnvironment(const QString &name, const QString &value); - - /** - * Changes the current working directory (CWD) of the process - * to be started. - * This function must be called before starting the process. - */ - void setWorkingDirectory(const QString &dir); - - /** - * Specify whether to start the command via a shell or directly. - * The default is to start the command directly. - * If @p useShell is true @p shell will be used as shell, or - * if shell is empty, the standard shell is used. - * @p quote A flag indicating whether to quote the arguments. - * - * When using a shell, the caller should make sure that all filenames etc. - * are properly quoted when passed as argument. - * @see quote() - */ - void setUseShell(bool useShell, const char *shell = 0); - - /** - * This function can be used to quote an argument string such that - * the shell processes it properly. This is e. g. necessary for - * user-provided file names which may contain spaces or quotes. - * It also prevents expansion of wild cards and environment variables. - */ - static QString quote(const QString &arg); - - /** - * Detaches OProcess from child process. All communication is closed. - * No exit notification is emitted any more for the child process. - * Deleting the OProcess will no longer kill the child process. - * Note that the current process remains the parent process of the - * child process. - */ - void detach(); - - - -signals: - - /** - * Emitted after the process has terminated when - * the process was run in the @p NotifyOnExit (==default option to - * @ref start()) or the @ref Block mode. - **/ - void processExited(OProcess *proc); - - - /** - * Emitted, when output from the child process has - * been received on stdout. - * - * To actually get - * these signals, the respective communication link (stdout/stderr) - * has to be turned on in @ref start(). - * - * @param buffer The data received. - * @param buflen The number of bytes that are available. - * - * You should copy the information contained in @p buffer to your private - * data structures before returning from this slot. - **/ - void receivedStdout(OProcess *proc, char *buffer, int buflen); - - /** - * Emitted when output from the child process has - * been received on stdout. - * - * To actually get these signals, the respective communications link - * (stdout/stderr) has to be turned on in @ref start() and the - * @p NoRead flag should have been passed. - * - * You will need to explicitly call resume() after your call to start() - * to begin processing data from the child process's stdout. This is - * to ensure that this signal is not emitted when no one is connected - * to it, otherwise this signal will not be emitted. - * - * The data still has to be read from file descriptor @p fd. - **/ - void receivedStdout(int fd, int &len); - - - /** - * Emitted, when output from the child process has - * been received on stderr. - * To actually get - * these signals, the respective communication link (stdout/stderr) - * has to be turned on in @ref start(). - * - * @param buffer The data received. - * @param buflen The number of bytes that are available. - * - * You should copy the information contained in @p buffer to your private - * data structures before returning from this slot. - */ - void receivedStderr(OProcess *proc, char *buffer, int buflen); - - /** - * Emitted after all the data that has been - * specified by a prior call to @ref writeStdin() has actually been - * written to the child process. - **/ - void wroteStdin(OProcess *proc); - - -protected slots: - - /** - * This slot gets activated when data from the child's stdout arrives. - * It usually calls "childOutput" - */ - void slotChildOutput(int fdno); - - /** - * This slot gets activated when data from the child's stderr arrives. - * It usually calls "childError" - */ - void slotChildError(int fdno); - /* - Slot functions for capturing stdout and stderr of the child - */ - - /** - * Called when another bulk of data can be sent to the child's - * stdin. If there is no more data to be sent to stdin currently - * available, this function must disable the QSocketNotifier "innot". - */ - void slotSendData(int dummy); - -protected: - - /** - * Sets up the environment according to the data passed via - * setEnvironment(...) - */ - void setupEnvironment(); - - /** - * The list of the process' command line arguments. The first entry - * in this list is the executable itself. - */ - QValueList<QCString> arguments; - /** - * How to run the process (Block, NotifyOnExit, DontCare). You should - * not modify this data member directly from derived classes. - */ - RunMode run_mode; - /** - * true if the process is currently running. You should not - * modify this data member directly from derived classes. For - * reading the value of this data member, please use "isRunning()" - * since "runs" will probably be made private in later versions - * of OProcess. - */ - bool runs; - - /** - * The PID of the currently running process (see "getPid()"). - * You should not modify this data member in derived classes. - * Please use "getPid()" instead of directly accessing this - * member function since it will probably be made private in - * later versions of OProcess. - */ - pid_t pid_; - - /** - * The process' exit status as returned by "waitpid". You should not - * modify the value of this data member from derived classes. You should - * rather use @ref exitStatus than accessing this data member directly - * since it will probably be made private in further versions of - * OProcess. - */ - int status; - - - /** - * See setRunPrivileged() - */ - bool keepPrivs; - - /* - Functions for setting up the sockets for communication. - setupCommunication - -- is called from "start" before "fork"ing. - commSetupDoneP - -- completes communication socket setup in the parent - commSetupDoneC - -- completes communication setup in the child process - commClose - -- frees all allocated communication resources in the parent - after the process has exited - */ - - /** - * This function is called from "OProcess::start" right before a "fork" takes - * place. According to - * the "comm" parameter this function has to initialize the "in", "out" and - * "err" data member of OProcess. - * - * This function should return 0 if setting the needed communication channels - * was successful. - * - * The default implementation is to create UNIX STREAM sockets for the communication, - * but you could overload this function and establish a TCP/IP communication for - * network communication, for example. - */ - virtual int setupCommunication(Communication comm); - - /** - * Called right after a (successful) fork on the parent side. This function - * will usually do some communications cleanup, like closing the reading end - * of the "stdin" communication channel. - * - * Furthermore, it must also create the QSocketNotifiers "innot", "outnot" and - * "errnot" and connect their Qt slots to the respective OProcess member functions. - * - * For a more detailed explanation, it is best to have a look at the default - * implementation of "setupCommunication" in kprocess.cpp. - */ - virtual int commSetupDoneP(); - - /** - * Called right after a (successful) fork, but before an "exec" on the child - * process' side. It usually just closes the unused communication ends of - * "in", "out" and "err" (like the writing end of the "in" communication - * channel. - */ - virtual int commSetupDoneC(); - - - /** - * Immediately called after a process has exited. This function normally - * calls commClose to close all open communication channels to this - * process and emits the "processExited" signal (if the process was - * not running in the "DontCare" mode). - */ - virtual void processHasExited(int state); - - /** - * Should clean up the communication links to the child after it has - * exited. Should be called from "processHasExited". - */ - virtual void commClose(); - - - /** - * the socket descriptors for stdin/stdout/stderr. - */ - int out[2]; - int in[2]; - int err[2]; - - /** - * The socket notifiers for the above socket descriptors. - */ - QSocketNotifier *innot; - QSocketNotifier *outnot; - QSocketNotifier *errnot; - - /** - * Lists the communication links that are activated for the child - * process. Should not be modified from derived classes. - */ - Communication communication; - - /** - * Called by "slotChildOutput" this function copies data arriving from the - * child process's stdout to the respective buffer and emits the signal - * "@ref receivedStderr". - */ - int childOutput(int fdno); - - /** - * Called by "slotChildOutput" this function copies data arriving from the - * child process's stdout to the respective buffer and emits the signal - * "@ref receivedStderr" - */ - int childError(int fdno); - - // information about the data that has to be sent to the child: - - const char *input_data; // the buffer holding the data - int input_sent; // # of bytes already transmitted - int input_total; // total length of input_data - - /** - * @ref OProcessController is a friend of OProcess because it has to have - * access to various data members. - */ - friend class OProcessController; - - -private: - /** - * Searches for a valid shell. - * Here is the algorithm used for finding an executable shell: - * - * @li Try the executable pointed to by the "SHELL" environment - * variable with white spaces stripped off - * - * @li If your process runs with uid != euid or gid != egid, a shell - * not listed in /etc/shells will not used. - * - * @li If no valid shell could be found, "/bin/sh" is used as a last resort. - */ - QCString searchShell(); - - /** - * Used by @ref searchShell in order to find out whether the shell found - * is actually executable at all. - */ - bool isExecutable(const QCString &filename); - - // Disallow assignment and copy-construction - OProcess( const OProcess& ); - OProcess& operator= ( const OProcess& ); - -private: - void init ( ); - - OProcessPrivate *d; -}; - - - -#endif - |