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1 | /* This file is part of the KDE libraries | ||
2 | Copyright (C) 1997 Christian Czezakte (e9025461@student.tuwien.ac.at) | ||
3 | |||
4 | This library is free software; you can redistribute it and/or | ||
5 | modify it under the terms of the GNU Library General Public | ||
6 | License as published by the Free Software Foundation; either | ||
7 | version 2 of the License, or (at your option) any later version. | ||
8 | |||
9 | This library is distributed in the hope that it will be useful, | ||
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
12 | Library General Public License for more details. | ||
13 | |||
14 | You should have received a copy of the GNU Library General Public License | ||
15 | along with this library; see the file COPYING.LIB. If not, write to | ||
16 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | ||
17 | Boston, MA 02111-1307, USA. | ||
18 | */ | ||
19 | // | ||
20 | // KPROCESS -- A class for handling child processes in KDE without | ||
21 | // having to take care of Un*x specific implementation details | ||
22 | // | ||
23 | // version 0.3.1, Jan 8th 1998 | ||
24 | // | ||
25 | // (C) Christian Czezatke | ||
26 | // e9025461@student.tuwien.ac.at | ||
27 | // | ||
28 | |||
29 | #ifndef __kprocess_h__ | ||
30 | #define __kprocess_h__ | ||
31 | |||
32 | #include <sys/types.h> // for pid_t | ||
33 | #include <sys/wait.h> | ||
34 | #include <signal.h> | ||
35 | #include <unistd.h> | ||
36 | #include <qvaluelist.h> | ||
37 | #include <qcstring.h> | ||
38 | #include <qobject.h> | ||
39 | |||
40 | class QSocketNotifier; | ||
41 | class KProcessPrivate; | ||
42 | |||
43 | /** | ||
44 | * Child process invocation, monitoring and control. | ||
45 | * | ||
46 | * @sect General usage and features | ||
47 | * | ||
48 | *This class allows a KDE application to start child processes without having | ||
49 | *to worry about UN*X signal handling issues and zombie process reaping. | ||
50 | * | ||
51 | *@see KProcIO | ||
52 | * | ||
53 | *Basically, this class distinguishes three different ways of running | ||
54 | *child processes: | ||
55 | * | ||
56 | *@li KProcess::DontCare -- The child process is invoked and both the child | ||
57 | *process and the parent process continue concurrently. | ||
58 | * | ||
59 | *Starting a DontCare child process means that the application is | ||
60 | *not interested in any notification to determine whether the | ||
61 | *child process has already exited or not. | ||
62 | * | ||
63 | *@li KProcess::NotifyOnExit -- The child process is invoked and both the | ||
64 | *child and the parent process run concurrently. | ||
65 | * | ||
66 | *When the child process exits, the KProcess instance | ||
67 | *corresponding to it emits the Qt signal @ref processExited(). | ||
68 | * | ||
69 | *Since this signal is @em not emitted from within a UN*X | ||
70 | *signal handler, arbitrary function calls can be made. | ||
71 | * | ||
72 | *Be aware: When the KProcess objects gets destructed, the child | ||
73 | *process will be killed if it is still running! | ||
74 | *This means in particular, that you cannot use a KProcess on the stack | ||
75 | *with KProcess::NotifyOnExit. | ||
76 | * | ||
77 | *@li KProcess::Block -- The child process starts and the parent process | ||
78 | *is suspended until the child process exits. (@em Really not recommended | ||
79 | *for programs with a GUI.) | ||
80 | * | ||
81 | *KProcess also provides several functions for determining the exit status | ||
82 | *and the pid of the child process it represents. | ||
83 | * | ||
84 | *Furthermore it is possible to supply command-line arguments to the process | ||
85 | *in a clean fashion (no null -- terminated stringlists and such...) | ||
86 | * | ||
87 | *A small usage example: | ||
88 | *<pre> | ||
89 | *KProcess *proc = new KProcess; | ||
90 | * | ||
91 | **proc << "my_executable"; | ||
92 | **proc << "These" << "are" << "the" << "command" << "line" << "args"; | ||
93 | *QApplication::connect(proc, SIGNAL(processExited(KProcess *)), | ||
94 | * pointer_to_my_object, SLOT(my_objects_slot(KProcess *))); | ||
95 | *proc->start(); | ||
96 | *</pre> | ||
97 | * | ||
98 | *This will start "my_executable" with the commandline arguments "These"... | ||
99 | * | ||
100 | *When the child process exits, the respective Qt signal will be emitted. | ||
101 | * | ||
102 | *@sect Communication with the child process | ||
103 | * | ||
104 | *KProcess supports communication with the child process through | ||
105 | *stdin/stdout/stderr. | ||
106 | * | ||
107 | *The following functions are provided for getting data from the child | ||
108 | *process or sending data to the child's stdin (For more information, | ||
109 | *have a look at the documentation of each function): | ||
110 | * | ||
111 | *@li bool @ref writeStdin(char *buffer, int buflen); | ||
112 | *@li -- Transmit data to the child process's stdin. | ||
113 | * | ||
114 | *@li bool @ref closeStdin(); | ||
115 | *@li -- Closes the child process's stdin (which causes it to see an feof(stdin)). | ||
116 | *Returns false if you try to close stdin for a process that has been started | ||
117 | *without a communication channel to stdin. | ||
118 | * | ||
119 | *@li bool @ref closeStdout(); | ||
120 | *@li -- Closes the child process's stdout. | ||
121 | *Returns false if you try to close stdout for a process that has been started | ||
122 | *without a communication channel to stdout. | ||
123 | * | ||
124 | *@li bool @ref closeStderr(); | ||
125 | *@li -- Closes the child process's stderr. | ||
126 | *Returns false if you try to close stderr for a process that has been started | ||
127 | *without a communication channel to stderr. | ||
128 | * | ||
129 | * | ||
130 | *@sect QT signals: | ||
131 | * | ||
132 | *@li void @ref receivedStdout(KProcess *proc, char *buffer, int buflen); | ||
133 | *@li void @ref receivedStderr(KProcess *proc, char *buffer, int buflen); | ||
134 | *@li -- Indicates that new data has arrived from either the | ||
135 | *child process's stdout or stderr. | ||
136 | * | ||
137 | *@li void @ref wroteStdin(KProcess *proc); | ||
138 | *@li -- Indicates that all data that has been sent to the child process | ||
139 | *by a prior call to @ref writeStdin() has actually been transmitted to the | ||
140 | *client . | ||
141 | * | ||
142 | *@author Christian Czezakte e9025461@student.tuwien.ac.at | ||
143 | * | ||
144 | * | ||
145 | **/ | ||
146 | class KProcess : public QObject | ||
147 | { | ||
148 | Q_OBJECT | ||
149 | |||
150 | public: | ||
151 | |||
152 | /** | ||
153 | * Modes in which the communication channel can be opened. | ||
154 | * | ||
155 | * If communication for more than one channel is required, | ||
156 | * the values have to be or'ed together, for example to get | ||
157 | * communication with stdout as well as with stdin, you would | ||
158 | * specify @p Stdin @p | @p Stdout | ||
159 | * | ||
160 | * If @p NoRead is specified in conjunction with @p Stdout, | ||
161 | * no data is actually read from @p Stdout but only | ||
162 | * the signal @ref childOutput(int fd) is emitted. | ||
163 | */ | ||
164 | enum Communication { NoCommunication = 0, Stdin = 1, Stdout = 2, Stderr = 4, | ||
165 | AllOutput = 6, All = 7, | ||
166 | NoRead }; | ||
167 | |||
168 | /** | ||
169 | * Run-modes for a child process. | ||
170 | */ | ||
171 | enum RunMode { | ||
172 | /** | ||
173 | * The application does not receive notifications from the subprocess when | ||
174 | * it is finished or aborted. | ||
175 | */ | ||
176 | DontCare, | ||
177 | /** | ||
178 | * The application is notified when the subprocess dies. | ||
179 | */ | ||
180 | NotifyOnExit, | ||
181 | /** | ||
182 | * The application is suspended until the started process is finished. | ||
183 | */ | ||
184 | Block }; | ||
185 | |||
186 | /** | ||
187 | * Constructor | ||
188 | */ | ||
189 | KProcess(); | ||
190 | |||
191 | /** | ||
192 | *Destructor: | ||
193 | * | ||
194 | * If the process is running when the destructor for this class | ||
195 | * is called, the child process is killed with a SIGKILL, but | ||
196 | * only if the run mode is not of type @p DontCare. | ||
197 | * Processes started as @p DontCare keep running anyway. | ||
198 | */ | ||
199 | virtual ~KProcess(); | ||
200 | |||
201 | /** | ||
202 | @deprecated | ||
203 | |||
204 | The use of this function is now deprecated. -- Please use the | ||
205 | "operator<<" instead of "setExecutable". | ||
206 | |||
207 | Sets the executable to be started with this KProcess object. | ||
208 | Returns false if the process is currently running (in that | ||
209 | case the executable remains unchanged.) | ||
210 | |||
211 | @see operator<< | ||
212 | |||
213 | */ | ||
214 | bool setExecutable(const QString& proc); | ||
215 | |||
216 | |||
217 | /** | ||
218 | * Sets the executable and the command line argument list for this process. | ||
219 | * | ||
220 | * For example, doing an "ls -l /usr/local/bin" can be achieved by: | ||
221 | * <pre> | ||
222 | * KProcess p; | ||
223 | * ... | ||
224 | * p << "ls" << "-l" << "/usr/local/bin" | ||
225 | * </pre> | ||
226 | * | ||
227 | **/ | ||
228 | KProcess &operator<<(const QString& arg); | ||
229 | /** | ||
230 | * Similar to previous method, takes a char *, supposed to be in locale 8 bit already. | ||
231 | */ | ||
232 | KProcess &operator<<(const char * arg); | ||
233 | /** | ||
234 | * Similar to previous method, takes a QCString, supposed to be in locale 8 bit already. | ||
235 | */ | ||
236 | KProcess &operator<<(const QCString & arg); | ||
237 | |||
238 | /** | ||
239 | * Sets the executable and the command line argument list for this process, | ||
240 | * in a single method call, or add a list of arguments. | ||
241 | **/ | ||
242 | KProcess &operator<<(const QStringList& args); | ||
243 | |||
244 | /** | ||
245 | * Clear a command line argument list that has been set by using | ||
246 | * the "operator<<". | ||
247 | */ | ||
248 | void clearArguments(); | ||
249 | |||
250 | /** | ||
251 | * Starts the process. | ||
252 | * For a detailed description of the | ||
253 | * various run modes and communication semantics, have a look at the | ||
254 | * general description of the KProcess class. | ||
255 | * | ||
256 | * The following problems could cause this function to | ||
257 | * return false: | ||
258 | * | ||
259 | * @li The process is already running. | ||
260 | * @li The command line argument list is empty. | ||
261 | * @li The starting of the process failed (could not fork). | ||
262 | * @li The executable was not found. | ||
263 | * | ||
264 | * @param comm Specifies which communication links should be | ||
265 | * established to the child process (stdin/stdout/stderr). By default, | ||
266 | * no communication takes place and the respective communication | ||
267 | * signals will never get emitted. | ||
268 | * | ||
269 | * @return true on success, false on error | ||
270 | * (see above for error conditions) | ||
271 | **/ | ||
272 | virtual bool start(RunMode runmode = NotifyOnExit, | ||
273 | Communication comm = NoCommunication); | ||
274 | |||
275 | /** | ||
276 | * Stop the process (by sending it a signal). | ||
277 | * | ||
278 | * @param signoThe signal to send. The default is SIGTERM. | ||
279 | * @return @p true if the signal was delivered successfully. | ||
280 | */ | ||
281 | virtual bool kill(int signo = SIGTERM); | ||
282 | |||
283 | /** | ||
284 | @return @p true if the process is (still) considered to be running | ||
285 | */ | ||
286 | bool isRunning() const; | ||
287 | |||
288 | /** Returns the process id of the process. | ||
289 | * | ||
290 | * If it is called after | ||
291 | * the process has exited, it returns the process id of the last | ||
292 | * child process that was created by this instance of KProcess. | ||
293 | * | ||
294 | * Calling it before any child process has been started by this | ||
295 | * KProcess instance causes pid() to return 0. | ||
296 | **/ | ||
297 | pid_t pid() const; | ||
298 | |||
299 | /** | ||
300 | * Use pid(). | ||
301 | * @deprecated | ||
302 | */ | ||
303 | pid_t getPid() const { return pid(); } | ||
304 | |||
305 | /** | ||
306 | * Suspend processing of data from stdout of the child process. | ||
307 | */ | ||
308 | void suspend(); | ||
309 | |||
310 | /** | ||
311 | * Resume processing of data from stdout of the child process. | ||
312 | */ | ||
313 | void resume(); | ||
314 | |||
315 | /** | ||
316 | * @return @p true if the process has already finished and has exited | ||
317 | * "voluntarily", ie: it has not been killed by a signal. | ||
318 | * | ||
319 | * Note that you should check @ref KProcess::exitStatus() to determine | ||
320 | * whether the process completed its task successful or not. | ||
321 | */ | ||
322 | bool normalExit() const; | ||
323 | |||
324 | /** | ||
325 | * Returns the exit status of the process. | ||
326 | * | ||
327 | * Please use | ||
328 | * @ref KProcess::normalExit() to check whether the process has exited | ||
329 | * cleanly (i.e., @ref KProcess::normalExit() returns @p true) before calling | ||
330 | * this function because if the process did not exit normally, | ||
331 | * it does not have a valid exit status. | ||
332 | */ | ||
333 | int exitStatus() const; | ||
334 | |||
335 | |||
336 | /** | ||
337 | * Transmit data to the child process's stdin. | ||
338 | * | ||
339 | * KProcess::writeStdin may return false in the following cases: | ||
340 | * | ||
341 | * @li The process is not currently running. | ||
342 | * | ||
343 | * @li Communication to stdin has not been requested in the @ref start() call. | ||
344 | * | ||
345 | * @li Transmission of data to the child process by a previous call to | ||
346 | * @ref writeStdin() is still in progress. | ||
347 | * | ||
348 | * Please note that the data is sent to the client asynchronously, | ||
349 | * so when this function returns, the data might not have been | ||
350 | * processed by the child process. | ||
351 | * | ||
352 | * If all the data has been sent to the client, the signal | ||
353 | * @ref wroteStdin() will be emitted. | ||
354 | * | ||
355 | * Please note that you must not free "buffer" or call @ref writeStdin() | ||
356 | * again until either a @ref wroteStdin() signal indicates that the | ||
357 | * data has been sent or a @ref processHasExited() signal shows that | ||
358 | * the child process is no longer alive... | ||
359 | **/ | ||
360 | bool writeStdin(const char *buffer, int buflen); | ||
361 | |||
362 | /** | ||
363 | * This causes the stdin file descriptor of the child process to be | ||
364 | * closed indicating an "EOF" to the child. | ||
365 | * | ||
366 | * @return @p false if no communication to the process's stdin | ||
367 | * had been specified in the call to @ref start(). | ||
368 | */ | ||
369 | bool closeStdin(); | ||
370 | |||
371 | /** | ||
372 | * This causes the stdout file descriptor of the child process to be | ||
373 | * closed. | ||
374 | * | ||
375 | * @return @p false if no communication to the process's stdout | ||
376 | * had been specified in the call to @ref start(). | ||
377 | */ | ||
378 | bool closeStdout(); | ||
379 | |||
380 | /** | ||
381 | * This causes the stderr file descriptor of the child process to be | ||
382 | * closed. | ||
383 | * | ||
384 | * @return @p false if no communication to the process's stderr | ||
385 | * had been specified in the call to @ref start(). | ||
386 | */ | ||
387 | bool closeStderr(); | ||
388 | |||
389 | /** | ||
390 | * Lets you see what your arguments are for debugging. | ||
391 | */ | ||
392 | |||
393 | const QValueList<QCString> &args() { return arguments; } | ||
394 | |||
395 | /** | ||
396 | * Controls whether the started process should drop any | ||
397 | * setuid/segid privileges or whether it should keep them | ||
398 | * | ||
399 | * The default is @p false : drop privileges | ||
400 | */ | ||
401 | void setRunPrivileged(bool keepPrivileges); | ||
402 | |||
403 | /** | ||
404 | * Returns whether the started process will drop any | ||
405 | * setuid/segid privileges or whether it will keep them | ||
406 | */ | ||
407 | bool runPrivileged() const; | ||
408 | |||
409 | /** | ||
410 | * Modifies the environment of the process to be started. | ||
411 | * This function must be called before starting the process. | ||
412 | */ | ||
413 | void setEnvironment(const QString &name, const QString &value); | ||
414 | |||
415 | /** | ||
416 | * Changes the current working directory (CWD) of the process | ||
417 | * to be started. | ||
418 | * This function must be called before starting the process. | ||
419 | */ | ||
420 | void setWorkingDirectory(const QString &dir); | ||
421 | |||
422 | /** | ||
423 | * Specify whether to start the command via a shell or directly. | ||
424 | * The default is to start the command directly. | ||
425 | * If @p useShell is true @p shell will be used as shell, or | ||
426 | * if shell is empty, the standard shell is used. | ||
427 | * @p quote A flag indicating whether to quote the arguments. | ||
428 | * | ||
429 | * When using a shell, the caller should make sure that all filenames etc. | ||
430 | * are properly quoted when passed as argument. | ||
431 | * @see quote() | ||
432 | */ | ||
433 | void setUseShell(bool useShell, const char *shell = 0); | ||
434 | |||
435 | /** | ||
436 | * This function can be used to quote an argument string such that | ||
437 | * the shell processes it properly. This is e. g. necessary for | ||
438 | * user-provided file names which may contain spaces or quotes. | ||
439 | * It also prevents expansion of wild cards and environment variables. | ||
440 | */ | ||
441 | static QString quote(const QString &arg); | ||
442 | |||
443 | /** | ||
444 | * Detaches KProcess from child process. All communication is closed. | ||
445 | * No exit notification is emitted any more for the child process. | ||
446 | * Deleting the KProcess will no longer kill the child process. | ||
447 | * Note that the current process remains the parent process of the | ||
448 | * child process. | ||
449 | */ | ||
450 | void detach(); | ||
451 | |||
452 | |||
453 | |||
454 | signals: | ||
455 | |||
456 | /** | ||
457 | * Emitted after the process has terminated when | ||
458 | * the process was run in the @p NotifyOnExit (==default option to | ||
459 | * @ref start()) or the @ref Block mode. | ||
460 | **/ | ||
461 | void processExited(KProcess *proc); | ||
462 | |||
463 | |||
464 | /** | ||
465 | * Emitted, when output from the child process has | ||
466 | * been received on stdout. | ||
467 | * | ||
468 | * To actually get | ||
469 | * these signals, the respective communication link (stdout/stderr) | ||
470 | * has to be turned on in @ref start(). | ||
471 | * | ||
472 | * @param buffer The data received. | ||
473 | * @param buflen The number of bytes that are available. | ||
474 | * | ||
475 | * You should copy the information contained in @p buffer to your private | ||
476 | * data structures before returning from this slot. | ||
477 | **/ | ||
478 | void receivedStdout(KProcess *proc, char *buffer, int buflen); | ||
479 | |||
480 | /** | ||
481 | * Emitted when output from the child process has | ||
482 | * been received on stdout. | ||
483 | * | ||
484 | * To actually get these signals, the respective communications link | ||
485 | * (stdout/stderr) has to be turned on in @ref start() and the | ||
486 | * @p NoRead flag should have been passed. | ||
487 | * | ||
488 | * You will need to explicitly call resume() after your call to start() | ||
489 | * to begin processing data from the child process's stdout. This is | ||
490 | * to ensure that this signal is not emitted when no one is connected | ||
491 | * to it, otherwise this signal will not be emitted. | ||
492 | * | ||
493 | * The data still has to be read from file descriptor @p fd. | ||
494 | **/ | ||
495 | void receivedStdout(int fd, int &len); | ||
496 | |||
497 | |||
498 | /** | ||
499 | * Emitted, when output from the child process has | ||
500 | * been received on stderr. | ||
501 | * To actually get | ||
502 | * these signals, the respective communication link (stdout/stderr) | ||
503 | * has to be turned on in @ref start(). | ||
504 | * | ||
505 | * @param buffer The data received. | ||
506 | * @param buflen The number of bytes that are available. | ||
507 | * | ||
508 | * You should copy the information contained in @p buffer to your private | ||
509 | * data structures before returning from this slot. | ||
510 | */ | ||
511 | void receivedStderr(KProcess *proc, char *buffer, int buflen); | ||
512 | |||
513 | /** | ||
514 | * Emitted after all the data that has been | ||
515 | * specified by a prior call to @ref writeStdin() has actually been | ||
516 | * written to the child process. | ||
517 | **/ | ||
518 | void wroteStdin(KProcess *proc); | ||
519 | |||
520 | |||
521 | protected slots: | ||
522 | |||
523 | /** | ||
524 | * This slot gets activated when data from the child's stdout arrives. | ||
525 | * It usually calls "childOutput" | ||
526 | */ | ||
527 | void slotChildOutput(int fdno); | ||
528 | |||
529 | /** | ||
530 | * This slot gets activated when data from the child's stderr arrives. | ||
531 | * It usually calls "childError" | ||
532 | */ | ||
533 | void slotChildError(int fdno); | ||
534 | /* | ||
535 | Slot functions for capturing stdout and stderr of the child | ||
536 | */ | ||
537 | |||
538 | /** | ||
539 | * Called when another bulk of data can be sent to the child's | ||
540 | * stdin. If there is no more data to be sent to stdin currently | ||
541 | * available, this function must disable the QSocketNotifier "innot". | ||
542 | */ | ||
543 | void slotSendData(int dummy); | ||
544 | |||
545 | protected: | ||
546 | |||
547 | /** | ||
548 | * Sets up the environment according to the data passed via | ||
549 | * setEnvironment(...) | ||
550 | */ | ||
551 | void setupEnvironment(); | ||
552 | |||
553 | /** | ||
554 | * The list of the process' command line arguments. The first entry | ||
555 | * in this list is the executable itself. | ||
556 | */ | ||
557 | QValueList<QCString> arguments; | ||
558 | /** | ||
559 | * How to run the process (Block, NotifyOnExit, DontCare). You should | ||
560 | * not modify this data member directly from derived classes. | ||
561 | */ | ||
562 | RunMode run_mode; | ||
563 | /** | ||
564 | * true if the process is currently running. You should not | ||
565 | * modify this data member directly from derived classes. For | ||
566 | * reading the value of this data member, please use "isRunning()" | ||
567 | * since "runs" will probably be made private in later versions | ||
568 | * of KProcess. | ||
569 | */ | ||
570 | bool runs; | ||
571 | |||
572 | /** | ||
573 | * The PID of the currently running process (see "getPid()"). | ||
574 | * You should not modify this data member in derived classes. | ||
575 | * Please use "getPid()" instead of directly accessing this | ||
576 | * member function since it will probably be made private in | ||
577 | * later versions of KProcess. | ||
578 | */ | ||
579 | pid_t pid_; | ||
580 | |||
581 | /** | ||
582 | * The process' exit status as returned by "waitpid". You should not | ||
583 | * modify the value of this data member from derived classes. You should | ||
584 | * rather use @ref exitStatus than accessing this data member directly | ||
585 | * since it will probably be made private in further versions of | ||
586 | * KProcess. | ||
587 | */ | ||
588 | int status; | ||
589 | |||
590 | |||
591 | /** | ||
592 | * See setRunPrivileged() | ||
593 | */ | ||
594 | bool keepPrivs; | ||
595 | |||
596 | /* | ||
597 | Functions for setting up the sockets for communication. | ||
598 | setupCommunication | ||
599 | -- is called from "start" before "fork"ing. | ||
600 | commSetupDoneP | ||
601 | -- completes communication socket setup in the parent | ||
602 | commSetupDoneC | ||
603 | -- completes communication setup in the child process | ||
604 | commClose | ||
605 | -- frees all allocated communication resources in the parent | ||
606 | after the process has exited | ||
607 | */ | ||
608 | |||
609 | /** | ||
610 | * This function is called from "KProcess::start" right before a "fork" takes | ||
611 | * place. According to | ||
612 | * the "comm" parameter this function has to initialize the "in", "out" and | ||
613 | * "err" data member of KProcess. | ||
614 | * | ||
615 | * This function should return 0 if setting the needed communication channels | ||
616 | * was successful. | ||
617 | * | ||
618 | * The default implementation is to create UNIX STREAM sockets for the communication, | ||
619 | * but you could overload this function and establish a TCP/IP communication for | ||
620 | * network communication, for example. | ||
621 | */ | ||
622 | virtual int setupCommunication(Communication comm); | ||
623 | |||
624 | /** | ||
625 | * Called right after a (successful) fork on the parent side. This function | ||
626 | * will usually do some communications cleanup, like closing the reading end | ||
627 | * of the "stdin" communication channel. | ||
628 | * | ||
629 | * Furthermore, it must also create the QSocketNotifiers "innot", "outnot" and | ||
630 | * "errnot" and connect their Qt slots to the respective KProcess member functions. | ||
631 | * | ||
632 | * For a more detailed explanation, it is best to have a look at the default | ||
633 | * implementation of "setupCommunication" in kprocess.cpp. | ||
634 | */ | ||
635 | virtual int commSetupDoneP(); | ||
636 | |||
637 | /** | ||
638 | * Called right after a (successful) fork, but before an "exec" on the child | ||
639 | * process' side. It usually just closes the unused communication ends of | ||
640 | * "in", "out" and "err" (like the writing end of the "in" communication | ||
641 | * channel. | ||
642 | */ | ||
643 | virtual int commSetupDoneC(); | ||
644 | |||
645 | |||
646 | /** | ||
647 | * Immediately called after a process has exited. This function normally | ||
648 | * calls commClose to close all open communication channels to this | ||
649 | * process and emits the "processExited" signal (if the process was | ||
650 | * not running in the "DontCare" mode). | ||
651 | */ | ||
652 | virtual void processHasExited(int state); | ||
653 | |||
654 | /** | ||
655 | * Should clean up the communication links to the child after it has | ||
656 | * exited. Should be called from "processHasExited". | ||
657 | */ | ||
658 | virtual void commClose(); | ||
659 | |||
660 | |||
661 | /** | ||
662 | * the socket descriptors for stdin/stdout/stderr. | ||
663 | */ | ||
664 | int out[2]; | ||
665 | int in[2]; | ||
666 | int err[2]; | ||
667 | |||
668 | /** | ||
669 | * The socket notifiers for the above socket descriptors. | ||
670 | */ | ||
671 | QSocketNotifier *innot; | ||
672 | QSocketNotifier *outnot; | ||
673 | QSocketNotifier *errnot; | ||
674 | |||
675 | /** | ||
676 | * Lists the communication links that are activated for the child | ||
677 | * process. Should not be modified from derived classes. | ||
678 | */ | ||
679 | Communication communication; | ||
680 | |||
681 | /** | ||
682 | * Called by "slotChildOutput" this function copies data arriving from the | ||
683 | * child process's stdout to the respective buffer and emits the signal | ||
684 | * "@ref receivedStderr". | ||
685 | */ | ||
686 | int childOutput(int fdno); | ||
687 | |||
688 | /** | ||
689 | * Called by "slotChildOutput" this function copies data arriving from the | ||
690 | * child process's stdout to the respective buffer and emits the signal | ||
691 | * "@ref receivedStderr" | ||
692 | */ | ||
693 | int childError(int fdno); | ||
694 | |||
695 | // information about the data that has to be sent to the child: | ||
696 | |||
697 | const char *input_data; // the buffer holding the data | ||
698 | int input_sent; // # of bytes already transmitted | ||
699 | int input_total; // total length of input_data | ||
700 | |||
701 | /** | ||
702 | * @ref KProcessController is a friend of KProcess because it has to have | ||
703 | * access to various data members. | ||
704 | */ | ||
705 | friend class KProcessController; | ||
706 | |||
707 | |||
708 | private: | ||
709 | /** | ||
710 | * Searches for a valid shell. | ||
711 | * Here is the algorithm used for finding an executable shell: | ||
712 | * | ||
713 | * @li Try the executable pointed to by the "SHELL" environment | ||
714 | * variable with white spaces stripped off | ||
715 | * | ||
716 | * @li If your process runs with uid != euid or gid != egid, a shell | ||
717 | * not listed in /etc/shells will not used. | ||
718 | * | ||
719 | * @li If no valid shell could be found, "/bin/sh" is used as a last resort. | ||
720 | */ | ||
721 | QCString searchShell(); | ||
722 | |||
723 | /** | ||
724 | * Used by @ref searchShell in order to find out whether the shell found | ||
725 | * is actually executable at all. | ||
726 | */ | ||
727 | bool isExecutable(const QCString &filename); | ||
728 | |||
729 | // Disallow assignment and copy-construction | ||
730 | KProcess( const KProcess& ); | ||
731 | KProcess& operator= ( const KProcess& ); | ||
732 | |||
733 | protected: | ||
734 | virtual void virtual_hook( int id, void* data ); | ||
735 | private: | ||
736 | KProcessPrivate *d; | ||
737 | }; | ||
738 | |||
739 | class KShellProcessPrivate; | ||
740 | |||
741 | /** | ||
742 | * @obsolete | ||
743 | * | ||
744 | * This class is obsolete. Use KProcess and KProcess::setUseShell(true) | ||
745 | * instead. | ||
746 | * | ||
747 | * @short A class derived from @ref KProcess to start child | ||
748 | * processes through a shell. | ||
749 | * @author Christian Czezakte <e9025461@student.tuwien.ac.at> | ||
750 | * @version $Id$ | ||
751 | */ | ||
752 | class KShellProcess: public KProcess | ||
753 | { | ||
754 | Q_OBJECT | ||
755 | |||
756 | public: | ||
757 | |||
758 | /** | ||
759 | * Constructor | ||
760 | * | ||
761 | * By specifying the name of a shell (like "/bin/bash") you can override | ||
762 | * the mechanism for finding a valid shell as described in KProcess::searchShell() | ||
763 | */ | ||
764 | KShellProcess(const char *shellname=0); | ||
765 | |||
766 | /** | ||
767 | * Destructor. | ||
768 | */ | ||
769 | ~KShellProcess(); | ||
770 | |||
771 | /** | ||
772 | * Starts up the process. -- For a detailed description | ||
773 | * have a look at the "start" member function and the detailed | ||
774 | * description of @ref KProcess . | ||
775 | */ | ||
776 | virtual bool start(RunMode runmode = NotifyOnExit, | ||
777 | Communication comm = NoCommunication); | ||
778 | |||
779 | /** | ||
780 | * This function can be used to quote an argument string such that | ||
781 | * the shell processes it properly. This is e. g. necessary for | ||
782 | * user-provided file names which may contain spaces or quotes. | ||
783 | * It also prevents expansion of wild cards and environment variables. | ||
784 | */ | ||
785 | static QString quote(const QString &arg); | ||
786 | |||
787 | private: | ||
788 | |||
789 | QCString shell; | ||
790 | |||
791 | // Disallow assignment and copy-construction | ||
792 | KShellProcess( const KShellProcess& ); | ||
793 | KShellProcess& operator= ( const KShellProcess& ); | ||
794 | |||
795 | protected: | ||
796 | virtual void virtual_hook( int id, void* data ); | ||
797 | private: | ||
798 | KShellProcessPrivate *d; | ||
799 | }; | ||
800 | |||
801 | |||
802 | |||
803 | #endif | ||
804 | |||