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1 | /* | ||
2 | This file is part of the Opie Project | ||
3 | Copyright (C) 2003-2004 Holger Freyther <zecke@handhelds.org> | ||
4 | Copyright (C) The Opie Team <opie-devel@handhelds.org> | ||
5 | =. Based on KProcess (C) 1997 Christian Czezatke (e9025461@student.tuwien.ac.at) | ||
6 | .=l. | ||
7 | .>+-= | ||
8 | _;:, .> :=|. This program is free software; you can | ||
9 | .> <`_, > . <= redistribute it and/or modify it under | ||
10 | :`=1 )Y*s>-.-- : the terms of the GNU Library General Public | ||
11 | .="- .-=="i, .._ License as published by the Free Software | ||
12 | - . .-<_> .<> Foundation; either version 2 of the License, | ||
13 | ._= =} : or (at your option) any later version. | ||
14 | .%`+i> _;_. | ||
15 | .i_,=:_. -<s. This program is distributed in the hope that | ||
16 | + . -:. = it will be useful, but WITHOUT ANY WARRANTY; | ||
17 | : .. .:, . . . without even the implied warranty of | ||
18 | =_ + =;=|` MERCHANTABILITY or FITNESS FOR A | ||
19 | _.=:. : :=>`: PARTICULAR PURPOSE. See the GNU | ||
20 | ..}^=.= = ; Library General Public License for more | ||
21 | ++= -. .` .: details. | ||
22 | : = ...= . :.=- | ||
23 | -. .:....=;==+<; You should have received a copy of the GNU | ||
24 | -_. . . )=. = Library General Public License along with | ||
25 | -- :-=` this library; see the file COPYING.LIB. | ||
26 | If not, write to the Free Software Foundation, | ||
27 | Inc., 59 Temple Place - Suite 330, | ||
28 | Boston, MA 02111-1307, USA. | ||
29 | */ | ||
30 | |||
31 | #ifndef OPROCESS_H | ||
32 | #define OPROCESS_H | ||
33 | |||
34 | /* QT */ | ||
35 | #include <qcstring.h> | ||
36 | #include <qobject.h> | ||
37 | #include <qvaluelist.h> | ||
38 | |||
39 | /* STD */ | ||
40 | #include <sys/types.h> // for pid_t | ||
41 | #include <sys/wait.h> | ||
42 | #include <signal.h> | ||
43 | #include <unistd.h> | ||
44 | |||
45 | class QSocketNotifier; | ||
46 | |||
47 | namespace Opie { | ||
48 | namespace Core { | ||
49 | namespace Internal { | ||
50 | class OProcessController; | ||
51 | class OProcessPrivate; | ||
52 | } | ||
53 | |||
54 | /** | ||
55 | * Child process invocation, monitoring and control. | ||
56 | * | ||
57 | * @sect General usage and features | ||
58 | * | ||
59 | *This class allows a KDE and OPIE application to start child processes without having | ||
60 | *to worry about UN*X signal handling issues and zombie process reaping. | ||
61 | * | ||
62 | *@see KProcIO | ||
63 | * | ||
64 | *Basically, this class distinguishes three different ways of running | ||
65 | *child processes: | ||
66 | * | ||
67 | *@li OProcess::DontCare -- The child process is invoked and both the child | ||
68 | *process and the parent process continue concurrently. | ||
69 | * | ||
70 | *Starting a DontCare child process means that the application is | ||
71 | *not interested in any notification to determine whether the | ||
72 | *child process has already exited or not. | ||
73 | * | ||
74 | *@li OProcess::NotifyOnExit -- The child process is invoked and both the | ||
75 | *child and the parent process run concurrently. | ||
76 | * | ||
77 | *When the child process exits, the OProcess instance | ||
78 | *corresponding to it emits the Qt signal @ref processExited(). | ||
79 | * | ||
80 | *Since this signal is @em not emitted from within a UN*X | ||
81 | *signal handler, arbitrary function calls can be made. | ||
82 | * | ||
83 | *Be aware: When the OProcess objects gets destructed, the child | ||
84 | *process will be killed if it is still running! | ||
85 | *This means in particular, that you cannot use a OProcess on the stack | ||
86 | *with OProcess::NotifyOnExit. | ||
87 | * | ||
88 | *@li OProcess::Block -- The child process starts and the parent process | ||
89 | *is suspended until the child process exits. (@em Really not recommended | ||
90 | *for programs with a GUI.) | ||
91 | * | ||
92 | *OProcess also provides several functions for determining the exit status | ||
93 | *and the pid of the child process it represents. | ||
94 | * | ||
95 | *Furthermore it is possible to supply command-line arguments to the process | ||
96 | *in a clean fashion (no null -- terminated stringlists and such...) | ||
97 | * | ||
98 | *A small usage example: | ||
99 | *<pre> | ||
100 | *OProcess *proc = new OProcess; | ||
101 | * | ||
102 | **proc << "my_executable"; | ||
103 | **proc << "These" << "are" << "the" << "command" << "line" << "args"; | ||
104 | *QApplication::connect(proc, SIGNAL(processExited(Opie::Core::OProcess *)), | ||
105 | * pointer_to_my_object, SLOT(my_objects_slot(Opie::Core::OProcess *))); | ||
106 | *proc->start(); | ||
107 | *</pre> | ||
108 | * | ||
109 | *This will start "my_executable" with the commandline arguments "These"... | ||
110 | * | ||
111 | *When the child process exits, the respective Qt signal will be emitted. | ||
112 | * | ||
113 | *@sect Communication with the child process | ||
114 | * | ||
115 | *OProcess supports communication with the child process through | ||
116 | *stdin/stdout/stderr. | ||
117 | * | ||
118 | *The following functions are provided for getting data from the child | ||
119 | *process or sending data to the child's stdin (For more information, | ||
120 | *have a look at the documentation of each function): | ||
121 | * | ||
122 | *@li bool @ref writeStdin(char *buffer, int buflen); | ||
123 | *@li -- Transmit data to the child process's stdin. | ||
124 | * | ||
125 | *@li bool @ref closeStdin(); | ||
126 | *@li -- Closes the child process's stdin (which causes it to see an feof(stdin)). | ||
127 | *Returns false if you try to close stdin for a process that has been started | ||
128 | *without a communication channel to stdin. | ||
129 | * | ||
130 | *@li bool @ref closeStdout(); | ||
131 | *@li -- Closes the child process's stdout. | ||
132 | *Returns false if you try to close stdout for a process that has been started | ||
133 | *without a communication channel to stdout. | ||
134 | * | ||
135 | *@li bool @ref closeStderr(); | ||
136 | *@li -- Closes the child process's stderr. | ||
137 | *Returns false if you try to close stderr for a process that has been started | ||
138 | *without a communication channel to stderr. | ||
139 | * | ||
140 | * | ||
141 | *@sect QT signals: | ||
142 | * | ||
143 | *@li void @ref receivedStdout(OProcess *proc, char *buffer, int buflen); | ||
144 | *@li void @ref receivedStderr(OProcess *proc, char *buffer, int buflen); | ||
145 | *@li -- Indicates that new data has arrived from either the | ||
146 | *child process's stdout or stderr. | ||
147 | * | ||
148 | *@li void @ref wroteStdin(OProcess *proc); | ||
149 | *@li -- Indicates that all data that has been sent to the child process | ||
150 | *by a prior call to @ref writeStdin() has actually been transmitted to the | ||
151 | *client . | ||
152 | * | ||
153 | *@author Christian Czezakte e9025461@student.tuwien.ac.at | ||
154 | *@author Holger Freyther (Opie Port) | ||
155 | * | ||
156 | **/ | ||
157 | class OProcess : public QObject | ||
158 | { | ||
159 | Q_OBJECT | ||
160 | |||
161 | public: | ||
162 | |||
163 | /** | ||
164 | * Modes in which the communication channel can be opened. | ||
165 | * | ||
166 | * If communication for more than one channel is required, | ||
167 | * the values have to be or'ed together, for example to get | ||
168 | * communication with stdout as well as with stdin, you would | ||
169 | * specify @p Stdin @p | @p Stdout | ||
170 | * | ||
171 | * If @p NoRead is specified in conjunction with @p Stdout, | ||
172 | * no data is actually read from @p Stdout but only | ||
173 | * the signal @ref childOutput(int fd) is emitted. | ||
174 | */ | ||
175 | enum Communication { NoCommunication = 0, Stdin = 1, Stdout = 2, Stderr = 4, | ||
176 | AllOutput = 6, All = 7, | ||
177 | NoRead }; | ||
178 | |||
179 | /** | ||
180 | * Run-modes for a child process. | ||
181 | */ | ||
182 | enum RunMode { | ||
183 | /** | ||
184 | * The application does not receive notifications from the subprocess when | ||
185 | * it is finished or aborted. | ||
186 | */ | ||
187 | DontCare, | ||
188 | /** | ||
189 | * The application is notified when the subprocess dies. | ||
190 | */ | ||
191 | NotifyOnExit, | ||
192 | /** | ||
193 | * The application is suspended until the started process is finished. | ||
194 | */ | ||
195 | Block }; | ||
196 | |||
197 | /** | ||
198 | * Constructor | ||
199 | */ | ||
200 | OProcess( QObject *parent = 0, const char *name = 0 ); | ||
201 | /** | ||
202 | * Constructor | ||
203 | */ | ||
204 | OProcess( const QString &arg0, QObject *parent = 0, const char *name = 0 ); | ||
205 | /** | ||
206 | * Constructor | ||
207 | */ | ||
208 | OProcess( const QStringList &args, QObject *parent = 0, const char *name = 0 ); | ||
209 | |||
210 | /** | ||
211 | *Destructor: | ||
212 | * | ||
213 | * If the process is running when the destructor for this class | ||
214 | * is called, the child process is killed with a SIGKILL, but | ||
215 | * only if the run mode is not of type @p DontCare. | ||
216 | * Processes started as @p DontCare keep running anyway. | ||
217 | */ | ||
218 | virtual ~OProcess(); | ||
219 | |||
220 | /** | ||
221 | @deprecated | ||
222 | |||
223 | The use of this function is now deprecated. -- Please use the | ||
224 | "operator<<" instead of "setExecutable". | ||
225 | |||
226 | Sets the executable to be started with this OProcess object. | ||
227 | Returns false if the process is currently running (in that | ||
228 | case the executable remains unchanged.) | ||
229 | |||
230 | @see operator<< | ||
231 | |||
232 | */ | ||
233 | bool setExecutable( const QString& proc ); | ||
234 | |||
235 | |||
236 | /** | ||
237 | * Sets the executable and the command line argument list for this process. | ||
238 | * | ||
239 | * For example, doing an "ls -l /usr/local/bin" can be achieved by: | ||
240 | * <pre> | ||
241 | * OProcess p; | ||
242 | * ... | ||
243 | * p << "ls" << "-l" << "/usr/local/bin" | ||
244 | * </pre> | ||
245 | * | ||
246 | **/ | ||
247 | OProcess &operator<<( const QString& arg ); | ||
248 | /** | ||
249 | * Similar to previous method, takes a char *, supposed to be in locale 8 bit already. | ||
250 | */ | ||
251 | OProcess &operator<<( const char * arg ); | ||
252 | /** | ||
253 | * Similar to previous method, takes a QCString, supposed to be in locale 8 bit already. | ||
254 | */ | ||
255 | OProcess &operator<<( const QCString & arg ); | ||
256 | |||
257 | /** | ||
258 | * Sets the executable and the command line argument list for this process, | ||
259 | * in a single method call, or add a list of arguments. | ||
260 | **/ | ||
261 | OProcess &operator<<( const QStringList& args ); | ||
262 | |||
263 | /** | ||
264 | * Clear a command line argument list that has been set by using | ||
265 | * the "operator<<". | ||
266 | */ | ||
267 | void clearArguments(); | ||
268 | |||
269 | /** | ||
270 | * Starts the process. | ||
271 | * For a detailed description of the | ||
272 | * various run modes and communication semantics, have a look at the | ||
273 | * general description of the OProcess class. | ||
274 | * | ||
275 | * The following problems could cause this function to | ||
276 | * return false: | ||
277 | * | ||
278 | * @li The process is already running. | ||
279 | * @li The command line argument list is empty. | ||
280 | * @li The starting of the process failed (could not fork). | ||
281 | * @li The executable was not found. | ||
282 | * | ||
283 | * @param comm Specifies which communication links should be | ||
284 | * established to the child process (stdin/stdout/stderr). By default, | ||
285 | * no communication takes place and the respective communication | ||
286 | * signals will never get emitted. | ||
287 | * | ||
288 | * @return true on success, false on error | ||
289 | * (see above for error conditions) | ||
290 | **/ | ||
291 | virtual bool start( RunMode runmode = NotifyOnExit, | ||
292 | Communication comm = NoCommunication ); | ||
293 | |||
294 | /** | ||
295 | * Stop the process (by sending it a signal). | ||
296 | * | ||
297 | * @param signoThe signal to send. The default is SIGTERM. | ||
298 | * @return @p true if the signal was delivered successfully. | ||
299 | */ | ||
300 | virtual bool kill( int signo = SIGTERM ); | ||
301 | |||
302 | /** | ||
303 | @return @p true if the process is (still) considered to be running | ||
304 | */ | ||
305 | bool isRunning() const; | ||
306 | |||
307 | /** Returns the process id of the process. | ||
308 | * | ||
309 | * If it is called after | ||
310 | * the process has exited, it returns the process id of the last | ||
311 | * child process that was created by this instance of OProcess. | ||
312 | * | ||
313 | * Calling it before any child process has been started by this | ||
314 | * OProcess instance causes pid() to return 0. | ||
315 | **/ | ||
316 | pid_t pid() const; | ||
317 | |||
318 | /** | ||
319 | * Suspend processing of data from stdout of the child process. | ||
320 | */ | ||
321 | void suspend(); | ||
322 | |||
323 | /** | ||
324 | * Resume processing of data from stdout of the child process. | ||
325 | */ | ||
326 | void resume(); | ||
327 | |||
328 | /** | ||
329 | * @return @p true if the process has already finished and has exited | ||
330 | * "voluntarily", ie: it has not been killed by a signal. | ||
331 | * | ||
332 | * Note that you should check @ref OProcess::exitStatus() to determine | ||
333 | * whether the process completed its task successful or not. | ||
334 | */ | ||
335 | bool normalExit() const; | ||
336 | |||
337 | /** | ||
338 | * Returns the exit status of the process. | ||
339 | * | ||
340 | * Please use | ||
341 | * @ref OProcess::normalExit() to check whether the process has exited | ||
342 | * cleanly (i.e., @ref OProcess::normalExit() returns @p true) before calling | ||
343 | * this function because if the process did not exit normally, | ||
344 | * it does not have a valid exit status. | ||
345 | */ | ||
346 | int exitStatus() const; | ||
347 | |||
348 | |||
349 | /** | ||
350 | * Transmit data to the child process's stdin. | ||
351 | * | ||
352 | * OProcess::writeStdin may return false in the following cases: | ||
353 | * | ||
354 | * @li The process is not currently running. | ||
355 | * | ||
356 | * @li Communication to stdin has not been requested in the @ref start() call. | ||
357 | * | ||
358 | * @li Transmission of data to the child process by a previous call to | ||
359 | * @ref writeStdin() is still in progress. | ||
360 | * | ||
361 | * Please note that the data is sent to the client asynchronously, | ||
362 | * so when this function returns, the data might not have been | ||
363 | * processed by the child process. | ||
364 | * | ||
365 | * If all the data has been sent to the client, the signal | ||
366 | * @ref wroteStdin() will be emitted. | ||
367 | * | ||
368 | * Please note that you must not free "buffer" or call @ref writeStdin() | ||
369 | * again until either a @ref wroteStdin() signal indicates that the | ||
370 | * data has been sent or a @ref processHasExited() signal shows that | ||
371 | * the child process is no longer alive... | ||
372 | **/ | ||
373 | bool writeStdin( const char *buffer, int buflen ); | ||
374 | |||
375 | void flushStdin(); | ||
376 | |||
377 | /** | ||
378 | * This causes the stdin file descriptor of the child process to be | ||
379 | * closed indicating an "EOF" to the child. | ||
380 | * | ||
381 | * @return @p false if no communication to the process's stdin | ||
382 | * had been specified in the call to @ref start(). | ||
383 | */ | ||
384 | bool closeStdin(); | ||
385 | |||
386 | /** | ||
387 | * This causes the stdout file descriptor of the child process to be | ||
388 | * closed. | ||
389 | * | ||
390 | * @return @p false if no communication to the process's stdout | ||
391 | * had been specified in the call to @ref start(). | ||
392 | */ | ||
393 | bool closeStdout(); | ||
394 | |||
395 | /** | ||
396 | * This causes the stderr file descriptor of the child process to be | ||
397 | * closed. | ||
398 | * | ||
399 | * @return @p false if no communication to the process's stderr | ||
400 | * had been specified in the call to @ref start(). | ||
401 | */ | ||
402 | bool closeStderr(); | ||
403 | |||
404 | /** | ||
405 | * Lets you see what your arguments are for debugging. | ||
406 | * \todo make const | ||
407 | */ | ||
408 | |||
409 | const QValueList<QCString> &args() | ||
410 | { | ||
411 | return arguments; | ||
412 | } | ||
413 | |||
414 | /** | ||
415 | * Controls whether the started process should drop any | ||
416 | * setuid/segid privileges or whether it should keep them | ||
417 | * | ||
418 | * The default is @p false : drop privileges | ||
419 | */ | ||
420 | void setRunPrivileged( bool keepPrivileges ); | ||
421 | |||
422 | /** | ||
423 | * Returns whether the started process will drop any | ||
424 | * setuid/segid privileges or whether it will keep them | ||
425 | */ | ||
426 | bool runPrivileged() const; | ||
427 | |||
428 | /** | ||
429 | * Modifies the environment of the process to be started. | ||
430 | * This function must be called before starting the process. | ||
431 | */ | ||
432 | void setEnvironment( const QString &name, const QString &value ); | ||
433 | |||
434 | /** | ||
435 | * Changes the current working directory (CWD) of the process | ||
436 | * to be started. | ||
437 | * This function must be called before starting the process. | ||
438 | */ | ||
439 | void setWorkingDirectory( const QString &dir ); | ||
440 | |||
441 | /** | ||
442 | * Specify whether to start the command via a shell or directly. | ||
443 | * The default is to start the command directly. | ||
444 | * If @p useShell is true @p shell will be used as shell, or | ||
445 | * if shell is empty, the standard shell is used. | ||
446 | * @p quote A flag indicating whether to quote the arguments. | ||
447 | * | ||
448 | * When using a shell, the caller should make sure that all filenames etc. | ||
449 | * are properly quoted when passed as argument. | ||
450 | * @see quote() | ||
451 | */ | ||
452 | void setUseShell( bool useShell, const char *shell = 0 ); | ||
453 | |||
454 | /** | ||
455 | * This function can be used to quote an argument string such that | ||
456 | * the shell processes it properly. This is e. g. necessary for | ||
457 | * user-provided file names which may contain spaces or quotes. | ||
458 | * It also prevents expansion of wild cards and environment variables. | ||
459 | */ | ||
460 | static QString quote( const QString &arg ); | ||
461 | |||
462 | /** | ||
463 | * Detaches OProcess from child process. All communication is closed. | ||
464 | * No exit notification is emitted any more for the child process. | ||
465 | * Deleting the OProcess will no longer kill the child process. | ||
466 | * Note that the current process remains the parent process of the | ||
467 | * child process. | ||
468 | */ | ||
469 | void detach(); | ||
470 | |||
471 | /** | ||
472 | * @return the PID of @a process, or -1 if the process is not running | ||
473 | */ | ||
474 | static int processPID( const QString& process ); | ||
475 | |||
476 | signals: | ||
477 | |||
478 | /** | ||
479 | * Emitted after the process has terminated when | ||
480 | * the process was run in the @p NotifyOnExit (==default option to | ||
481 | * @ref start()) or the @ref Block mode. | ||
482 | **/ | ||
483 | void processExited( Opie::Core::OProcess *proc ); | ||
484 | |||
485 | |||
486 | /** | ||
487 | * Emitted, when output from the child process has | ||
488 | * been received on stdout. | ||
489 | * | ||
490 | * To actually get | ||
491 | * these signals, the respective communication link (stdout/stderr) | ||
492 | * has to be turned on in @ref start(). | ||
493 | * | ||
494 | * @param buffer The data received. | ||
495 | * @param buflen The number of bytes that are available. | ||
496 | * | ||
497 | * You should copy the information contained in @p buffer to your private | ||
498 | * data structures before returning from this slot. | ||
499 | **/ | ||
500 | void receivedStdout( Opie::Core::OProcess *proc, char *buffer, int buflen ); | ||
501 | |||
502 | /** | ||
503 | * Emitted when output from the child process has | ||
504 | * been received on stdout. | ||
505 | * | ||
506 | * To actually get these signals, the respective communications link | ||
507 | * (stdout/stderr) has to be turned on in @ref start() and the | ||
508 | * @p NoRead flag should have been passed. | ||
509 | * | ||
510 | * You will need to explicitly call resume() after your call to start() | ||
511 | * to begin processing data from the child process's stdout. This is | ||
512 | * to ensure that this signal is not emitted when no one is connected | ||
513 | * to it, otherwise this signal will not be emitted. | ||
514 | * | ||
515 | * The data still has to be read from file descriptor @p fd. | ||
516 | **/ | ||
517 | void receivedStdout( int fd, int &len ); | ||
518 | |||
519 | |||
520 | /** | ||
521 | * Emitted, when output from the child process has | ||
522 | * been received on stderr. | ||
523 | * To actually get | ||
524 | * these signals, the respective communication link (stdout/stderr) | ||
525 | * has to be turned on in @ref start(). | ||
526 | * | ||
527 | * @param buffer The data received. | ||
528 | * @param buflen The number of bytes that are available. | ||
529 | * | ||
530 | * You should copy the information contained in @p buffer to your private | ||
531 | * data structures before returning from this slot. | ||
532 | */ | ||
533 | void receivedStderr( Opie::Core::OProcess *proc, char *buffer, int buflen ); | ||
534 | |||
535 | /** | ||
536 | * Emitted after all the data that has been | ||
537 | * specified by a prior call to @ref writeStdin() has actually been | ||
538 | * written to the child process. | ||
539 | **/ | ||
540 | void wroteStdin( Opie::Core::OProcess *proc ); | ||
541 | |||
542 | protected slots: | ||
543 | |||
544 | /** | ||
545 | * This slot gets activated when data from the child's stdout arrives. | ||
546 | * It usually calls "childOutput" | ||
547 | */ | ||
548 | void slotChildOutput( int fdno ); | ||
549 | |||
550 | /** | ||
551 | * This slot gets activated when data from the child's stderr arrives. | ||
552 | * It usually calls "childError" | ||
553 | */ | ||
554 | void slotChildError( int fdno ); | ||
555 | /* | ||
556 | Slot functions for capturing stdout and stderr of the child | ||
557 | */ | ||
558 | |||
559 | /** | ||
560 | * Called when another bulk of data can be sent to the child's | ||
561 | * stdin. If there is no more data to be sent to stdin currently | ||
562 | * available, this function must disable the QSocketNotifier "innot". | ||
563 | */ | ||
564 | void slotSendData( int dummy ); | ||
565 | |||
566 | protected: | ||
567 | |||
568 | /** | ||
569 | * Sets up the environment according to the data passed via | ||
570 | * setEnvironment(...) | ||
571 | */ | ||
572 | void setupEnvironment(); | ||
573 | |||
574 | /** | ||
575 | * The list of the process' command line arguments. The first entry | ||
576 | * in this list is the executable itself. | ||
577 | */ | ||
578 | QValueList<QCString> arguments; | ||
579 | /** | ||
580 | * How to run the process (Block, NotifyOnExit, DontCare). You should | ||
581 | * not modify this data member directly from derived classes. | ||
582 | */ | ||
583 | RunMode run_mode; | ||
584 | /** | ||
585 | * true if the process is currently running. You should not | ||
586 | * modify this data member directly from derived classes. For | ||
587 | * reading the value of this data member, please use "isRunning()" | ||
588 | * since "runs" will probably be made private in later versions | ||
589 | * of OProcess. | ||
590 | */ | ||
591 | bool runs; | ||
592 | |||
593 | /** | ||
594 | * The PID of the currently running process (see "getPid()"). | ||
595 | * You should not modify this data member in derived classes. | ||
596 | * Please use "getPid()" instead of directly accessing this | ||
597 | * member function since it will probably be made private in | ||
598 | * later versions of OProcess. | ||
599 | */ | ||
600 | pid_t pid_; | ||
601 | |||
602 | /** | ||
603 | * The process' exit status as returned by "waitpid". You should not | ||
604 | * modify the value of this data member from derived classes. You should | ||
605 | * rather use @ref exitStatus than accessing this data member directly | ||
606 | * since it will probably be made private in further versions of | ||
607 | * OProcess. | ||
608 | */ | ||
609 | int status; | ||
610 | |||
611 | |||
612 | /** | ||
613 | * See setRunPrivileged() | ||
614 | */ | ||
615 | bool keepPrivs; | ||
616 | |||
617 | /* | ||
618 | Functions for setting up the sockets for communication. | ||
619 | setupCommunication | ||
620 | -- is called from "start" before "fork"ing. | ||
621 | commSetupDoneP | ||
622 | -- completes communication socket setup in the parent | ||
623 | commSetupDoneC | ||
624 | -- completes communication setup in the child process | ||
625 | commClose | ||
626 | -- frees all allocated communication resources in the parent | ||
627 | after the process has exited | ||
628 | */ | ||
629 | |||
630 | /** | ||
631 | * This function is called from "OProcess::start" right before a "fork" takes | ||
632 | * place. According to | ||
633 | * the "comm" parameter this function has to initialize the "in", "out" and | ||
634 | * "err" data member of OProcess. | ||
635 | * | ||
636 | * This function should return 0 if setting the needed communication channels | ||
637 | * was successful. | ||
638 | * | ||
639 | * The default implementation is to create UNIX STREAM sockets for the communication, | ||
640 | * but you could overload this function and establish a TCP/IP communication for | ||
641 | * network communication, for example. | ||
642 | */ | ||
643 | virtual int setupCommunication( Communication comm ); | ||
644 | |||
645 | /** | ||
646 | * Called right after a (successful) fork on the parent side. This function | ||
647 | * will usually do some communications cleanup, like closing the reading end | ||
648 | * of the "stdin" communication channel. | ||
649 | * | ||
650 | * Furthermore, it must also create the QSocketNotifiers "innot", "outnot" and | ||
651 | * "errnot" and connect their Qt slots to the respective OProcess member functions. | ||
652 | * | ||
653 | * For a more detailed explanation, it is best to have a look at the default | ||
654 | * implementation of "setupCommunication" in kprocess.cpp. | ||
655 | */ | ||
656 | virtual int commSetupDoneP(); | ||
657 | |||
658 | /** | ||
659 | * Called right after a (successful) fork, but before an "exec" on the child | ||
660 | * process' side. It usually just closes the unused communication ends of | ||
661 | * "in", "out" and "err" (like the writing end of the "in" communication | ||
662 | * channel. | ||
663 | */ | ||
664 | virtual int commSetupDoneC(); | ||
665 | |||
666 | |||
667 | /** | ||
668 | * Immediately called after a process has exited. This function normally | ||
669 | * calls commClose to close all open communication channels to this | ||
670 | * process and emits the "processExited" signal (if the process was | ||
671 | * not running in the "DontCare" mode). | ||
672 | */ | ||
673 | virtual void processHasExited( int state ); | ||
674 | |||
675 | /** | ||
676 | * Should clean up the communication links to the child after it has | ||
677 | * exited. Should be called from "processHasExited". | ||
678 | */ | ||
679 | virtual void commClose(); | ||
680 | |||
681 | |||
682 | /** | ||
683 | * the socket descriptors for stdin/stdout/stderr. | ||
684 | */ | ||
685 | int out[ 2 ]; | ||
686 | int in[ 2 ]; | ||
687 | int err[ 2 ]; | ||
688 | |||
689 | /** | ||
690 | * The socket notifiers for the above socket descriptors. | ||
691 | */ | ||
692 | QSocketNotifier *innot; | ||
693 | QSocketNotifier *outnot; | ||
694 | QSocketNotifier *errnot; | ||
695 | |||
696 | /** | ||
697 | * Lists the communication links that are activated for the child | ||
698 | * process. Should not be modified from derived classes. | ||
699 | */ | ||
700 | Communication communication; | ||
701 | |||
702 | /** | ||
703 | * Called by "slotChildOutput" this function copies data arriving from the | ||
704 | * child process's stdout to the respective buffer and emits the signal | ||
705 | * "@ref receivedStderr". | ||
706 | */ | ||
707 | int childOutput( int fdno ); | ||
708 | |||
709 | /** | ||
710 | * Called by "slotChildOutput" this function copies data arriving from the | ||
711 | * child process's stdout to the respective buffer and emits the signal | ||
712 | * "@ref receivedStderr" | ||
713 | */ | ||
714 | int childError( int fdno ); | ||
715 | |||
716 | // information about the data that has to be sent to the child: | ||
717 | |||
718 | const char *input_data; // the buffer holding the data | ||
719 | int input_sent; // # of bytes already transmitted | ||
720 | int input_total; // total length of input_data | ||
721 | |||
722 | /** | ||
723 | * @ref OProcessController is a friend of OProcess because it has to have | ||
724 | * access to various data members. | ||
725 | */ | ||
726 | friend class Internal::OProcessController; | ||
727 | |||
728 | private: | ||
729 | /** | ||
730 | * Searches for a valid shell. | ||
731 | * Here is the algorithm used for finding an executable shell: | ||
732 | * | ||
733 | * @li Try the executable pointed to by the "SHELL" environment | ||
734 | * variable with white spaces stripped off | ||
735 | * | ||
736 | * @li If your process runs with uid != euid or gid != egid, a shell | ||
737 | * not listed in /etc/shells will not used. | ||
738 | * | ||
739 | * @li If no valid shell could be found, "/bin/sh" is used as a last resort. | ||
740 | */ | ||
741 | QCString searchShell(); | ||
742 | |||
743 | /** | ||
744 | * Used by @ref searchShell in order to find out whether the shell found | ||
745 | * is actually executable at all. | ||
746 | */ | ||
747 | bool isExecutable( const QCString &filename ); | ||
748 | |||
749 | // Disallow assignment and copy-construction | ||
750 | OProcess( const OProcess& ); | ||
751 | OProcess& operator= ( const OProcess& ); | ||
752 | |||
753 | private: | ||
754 | void init ( ); | ||
755 | Internal::OProcessPrivate *d; | ||
756 | }; | ||
757 | } | ||
758 | } | ||
759 | |||
760 | #endif | ||
761 | |||