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1 /////////////////////////////////////////////////////////////////////////////
2 // Name: src/unix/utilsunx.cpp
3 // Purpose: generic Unix implementation of many wx functions (for wxBase)
4 // Author: Vadim Zeitlin
5 // Id: $Id$
6 // Copyright: (c) 1998 Robert Roebling, Vadim Zeitlin
7 // Licence: wxWindows licence
8 /////////////////////////////////////////////////////////////////////////////
9
10 // ============================================================================
11 // declarations
12 // ============================================================================
13
14 // ----------------------------------------------------------------------------
15 // headers
16 // ----------------------------------------------------------------------------
17
18 // for compilers that support precompilation, includes "wx.h".
19 #include "wx/wxprec.h"
20
21 #include "wx/utils.h"
22
23 #define USE_PUTENV (!defined(HAVE_SETENV) && defined(HAVE_PUTENV))
24
25 #ifndef WX_PRECOMP
26 #include "wx/string.h"
27 #include "wx/intl.h"
28 #include "wx/log.h"
29 #include "wx/app.h"
30 #include "wx/wxcrtvararg.h"
31 #if USE_PUTENV
32 #include "wx/module.h"
33 #include "wx/hashmap.h"
34 #endif
35 #endif
36
37 #include "wx/apptrait.h"
38
39 #include "wx/process.h"
40 #include "wx/thread.h"
41
42 #include "wx/cmdline.h"
43
44 #include "wx/wfstream.h"
45
46 #include "wx/private/selectdispatcher.h"
47 #include "wx/private/fdiodispatcher.h"
48 #include "wx/unix/execute.h"
49 #include "wx/unix/private.h"
50
51 #ifdef wxHAS_GENERIC_PROCESS_CALLBACK
52 #include "wx/private/fdiodispatcher.h"
53 #endif
54
55 #include <pwd.h>
56 #include <sys/wait.h> // waitpid()
57
58 #ifdef HAVE_SYS_SELECT_H
59 # include <sys/select.h>
60 #endif
61
62 #define HAS_PIPE_STREAMS (wxUSE_STREAMS && wxUSE_FILE)
63
64 #if HAS_PIPE_STREAMS
65
66 // define this to let wxexec.cpp know that we know what we're doing
67 #define _WX_USED_BY_WXEXECUTE_
68 #include "../common/execcmn.cpp"
69
70 #endif // HAS_PIPE_STREAMS
71
72 #if defined(__MWERKS__) && defined(__MACH__)
73 #ifndef WXWIN_OS_DESCRIPTION
74 #define WXWIN_OS_DESCRIPTION "MacOS X"
75 #endif
76 #ifndef HAVE_NANOSLEEP
77 #define HAVE_NANOSLEEP
78 #endif
79 #ifndef HAVE_UNAME
80 #define HAVE_UNAME
81 #endif
82
83 // our configure test believes we can use sigaction() if the function is
84 // available but Metrowekrs with MSL run-time does have the function but
85 // doesn't have sigaction struct so finally we can't use it...
86 #ifdef __MSL__
87 #undef wxUSE_ON_FATAL_EXCEPTION
88 #define wxUSE_ON_FATAL_EXCEPTION 0
89 #endif
90 #endif
91
92 // not only the statfs syscall is called differently depending on platform, but
93 // one of its incarnations, statvfs(), takes different arguments under
94 // different platforms and even different versions of the same system (Solaris
95 // 7 and 8): if you want to test for this, don't forget that the problems only
96 // appear if the large files support is enabled
97 #ifdef HAVE_STATFS
98 #ifdef __BSD__
99 #include <sys/param.h>
100 #include <sys/mount.h>
101 #else // !__BSD__
102 #include <sys/vfs.h>
103 #endif // __BSD__/!__BSD__
104
105 #define wxStatfs statfs
106
107 #ifndef HAVE_STATFS_DECL
108 // some systems lack statfs() prototype in the system headers (AIX 4)
109 extern "C" int statfs(const char *path, struct statfs *buf);
110 #endif
111 #endif // HAVE_STATFS
112
113 #ifdef HAVE_STATVFS
114 #include <sys/statvfs.h>
115
116 #define wxStatfs statvfs
117 #endif // HAVE_STATVFS
118
119 #if defined(HAVE_STATFS) || defined(HAVE_STATVFS)
120 // WX_STATFS_T is detected by configure
121 #define wxStatfs_t WX_STATFS_T
122 #endif
123
124 // SGI signal.h defines signal handler arguments differently depending on
125 // whether _LANGUAGE_C_PLUS_PLUS is set or not - do set it
126 #if defined(__SGI__) && !defined(_LANGUAGE_C_PLUS_PLUS)
127 #define _LANGUAGE_C_PLUS_PLUS 1
128 #endif // SGI hack
129
130 #include <stdarg.h>
131 #include <dirent.h>
132 #include <string.h>
133 #include <sys/stat.h>
134 #include <sys/types.h>
135 #include <sys/wait.h>
136 #include <unistd.h>
137 #include <errno.h>
138 #include <netdb.h>
139 #include <signal.h>
140 #include <fcntl.h> // for O_WRONLY and friends
141 #include <time.h> // nanosleep() and/or usleep()
142 #include <ctype.h> // isspace()
143 #include <sys/time.h> // needed for FD_SETSIZE
144
145 #ifdef HAVE_UNAME
146 #include <sys/utsname.h> // for uname()
147 #endif // HAVE_UNAME
148
149 // Used by wxGetFreeMemory().
150 #ifdef __SGI__
151 #include <sys/sysmp.h>
152 #include <sys/sysinfo.h> // for SAGET and MINFO structures
153 #endif
154
155 // ----------------------------------------------------------------------------
156 // conditional compilation
157 // ----------------------------------------------------------------------------
158
159 // many versions of Unices have this function, but it is not defined in system
160 // headers - please add your system here if it is the case for your OS.
161 // SunOS < 5.6 (i.e. Solaris < 2.6) and DG-UX are like this.
162 #if !defined(HAVE_USLEEP) && \
163 ((defined(__SUN__) && !defined(__SunOs_5_6) && \
164 !defined(__SunOs_5_7) && !defined(__SUNPRO_CC)) || \
165 defined(__osf__) || defined(__EMX__))
166 extern "C"
167 {
168 #ifdef __EMX__
169 /* I copied this from the XFree86 diffs. AV. */
170 #define INCL_DOSPROCESS
171 #include <os2.h>
172 inline void usleep(unsigned long delay)
173 {
174 DosSleep(delay ? (delay/1000l) : 1l);
175 }
176 #else // Unix
177 int usleep(unsigned int usec);
178 #endif // __EMX__/Unix
179 };
180
181 #define HAVE_USLEEP 1
182 #endif // Unices without usleep()
183
184 // ============================================================================
185 // implementation
186 // ============================================================================
187
188 // ----------------------------------------------------------------------------
189 // sleeping
190 // ----------------------------------------------------------------------------
191
192 void wxSleep(int nSecs)
193 {
194 sleep(nSecs);
195 }
196
197 void wxMicroSleep(unsigned long microseconds)
198 {
199 #if defined(HAVE_NANOSLEEP)
200 timespec tmReq;
201 tmReq.tv_sec = (time_t)(microseconds / 1000000);
202 tmReq.tv_nsec = (microseconds % 1000000) * 1000;
203
204 // we're not interested in remaining time nor in return value
205 (void)nanosleep(&tmReq, NULL);
206 #elif defined(HAVE_USLEEP)
207 // uncomment this if you feel brave or if you are sure that your version
208 // of Solaris has a safe usleep() function but please notice that usleep()
209 // is known to lead to crashes in MT programs in Solaris 2.[67] and is not
210 // documented as MT-Safe
211 #if defined(__SUN__) && wxUSE_THREADS
212 #error "usleep() cannot be used in MT programs under Solaris."
213 #endif // Sun
214
215 usleep(microseconds);
216 #elif defined(HAVE_SLEEP)
217 // under BeOS sleep() takes seconds (what about other platforms, if any?)
218 sleep(microseconds * 1000000);
219 #else // !sleep function
220 #error "usleep() or nanosleep() function required for wxMicroSleep"
221 #endif // sleep function
222 }
223
224 void wxMilliSleep(unsigned long milliseconds)
225 {
226 wxMicroSleep(milliseconds*1000);
227 }
228
229 // ----------------------------------------------------------------------------
230 // process management
231 // ----------------------------------------------------------------------------
232
233 int wxKill(long pid, wxSignal sig, wxKillError *rc, int flags)
234 {
235 int err = kill((pid_t) (flags & wxKILL_CHILDREN) ? -pid : pid, (int)sig);
236 if ( rc )
237 {
238 switch ( err ? errno : 0 )
239 {
240 case 0:
241 *rc = wxKILL_OK;
242 break;
243
244 case EINVAL:
245 *rc = wxKILL_BAD_SIGNAL;
246 break;
247
248 case EPERM:
249 *rc = wxKILL_ACCESS_DENIED;
250 break;
251
252 case ESRCH:
253 *rc = wxKILL_NO_PROCESS;
254 break;
255
256 default:
257 // this goes against Unix98 docs so log it
258 wxLogDebug(wxT("unexpected kill(2) return value %d"), err);
259
260 // something else...
261 *rc = wxKILL_ERROR;
262 }
263 }
264
265 return err;
266 }
267
268 // Shutdown or reboot the PC
269 bool wxShutdown(int flags)
270 {
271 flags &= ~wxSHUTDOWN_FORCE;
272
273 wxChar level;
274 switch ( flags )
275 {
276 case wxSHUTDOWN_POWEROFF:
277 level = wxT('0');
278 break;
279
280 case wxSHUTDOWN_REBOOT:
281 level = wxT('6');
282 break;
283
284 case wxSHUTDOWN_LOGOFF:
285 // TODO: use dcop to log off?
286 return false;
287
288 default:
289 wxFAIL_MSG( wxT("unknown wxShutdown() flag") );
290 return false;
291 }
292
293 return system(wxString::Format("init %c", level).mb_str()) == 0;
294 }
295
296 // ----------------------------------------------------------------------------
297 // wxStream classes to support IO redirection in wxExecute
298 // ----------------------------------------------------------------------------
299
300 #if HAS_PIPE_STREAMS
301
302 bool wxPipeInputStream::CanRead() const
303 {
304 if ( m_lasterror == wxSTREAM_EOF )
305 return false;
306
307 // check if there is any input available
308 struct timeval tv;
309 tv.tv_sec = 0;
310 tv.tv_usec = 0;
311
312 const int fd = m_file->fd();
313
314 fd_set readfds;
315
316 wxFD_ZERO(&readfds);
317 wxFD_SET(fd, &readfds);
318
319 switch ( select(fd + 1, &readfds, NULL, NULL, &tv) )
320 {
321 case -1:
322 wxLogSysError(_("Impossible to get child process input"));
323 // fall through
324
325 case 0:
326 return false;
327
328 default:
329 wxFAIL_MSG(wxT("unexpected select() return value"));
330 // still fall through
331
332 case 1:
333 // input available -- or maybe not, as select() returns 1 when a
334 // read() will complete without delay, but it could still not read
335 // anything
336 return !Eof();
337 }
338 }
339
340 size_t wxPipeOutputStream::OnSysWrite(const void *buffer, size_t size)
341 {
342 // We need to suppress error logging here, because on writing to a pipe
343 // which is full, wxFile::Write reports a system error. However, this is
344 // not an extraordinary situation, and it should not be reported to the
345 // user (but if really needed, the program can recognize it by checking
346 // whether LastRead() == 0.) Other errors will be reported below.
347 size_t ret;
348 {
349 wxLogNull logNo;
350 ret = m_file->Write(buffer, size);
351 }
352
353 switch ( m_file->GetLastError() )
354 {
355 // pipe is full
356 #ifdef EAGAIN
357 case EAGAIN:
358 #endif
359 #if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
360 case EWOULDBLOCK:
361 #endif
362 // do not treat it as an error
363 m_file->ClearLastError();
364 // fall through
365
366 // no error
367 case 0:
368 break;
369
370 // some real error
371 default:
372 wxLogSysError(_("Can't write to child process's stdin"));
373 m_lasterror = wxSTREAM_WRITE_ERROR;
374 }
375
376 return ret;
377 }
378
379 #endif // HAS_PIPE_STREAMS
380
381 // ----------------------------------------------------------------------------
382 // wxShell
383 // ----------------------------------------------------------------------------
384
385 static wxString wxMakeShellCommand(const wxString& command)
386 {
387 wxString cmd;
388 if ( !command )
389 {
390 // just an interactive shell
391 cmd = wxT("xterm");
392 }
393 else
394 {
395 // execute command in a shell
396 cmd << wxT("/bin/sh -c '") << command << wxT('\'');
397 }
398
399 return cmd;
400 }
401
402 bool wxShell(const wxString& command)
403 {
404 return wxExecute(wxMakeShellCommand(command), wxEXEC_SYNC) == 0;
405 }
406
407 bool wxShell(const wxString& command, wxArrayString& output)
408 {
409 wxCHECK_MSG( !command.empty(), false, wxT("can't exec shell non interactively") );
410
411 return wxExecute(wxMakeShellCommand(command), output);
412 }
413
414 namespace
415 {
416
417 // helper class for storing arguments as char** array suitable for passing to
418 // execvp(), whatever form they were passed to us
419 class ArgsArray
420 {
421 public:
422 ArgsArray(const wxArrayString& args)
423 {
424 Init(args.size());
425
426 for ( int i = 0; i < m_argc; i++ )
427 {
428 m_argv[i] = wxStrdup(args[i]);
429 }
430 }
431
432 #if wxUSE_UNICODE
433 ArgsArray(wchar_t **wargv)
434 {
435 int argc = 0;
436 while ( wargv[argc] )
437 argc++;
438
439 Init(argc);
440
441 for ( int i = 0; i < m_argc; i++ )
442 {
443 m_argv[i] = wxSafeConvertWX2MB(wargv[i]).release();
444 }
445 }
446 #endif // wxUSE_UNICODE
447
448 ~ArgsArray()
449 {
450 for ( int i = 0; i < m_argc; i++ )
451 {
452 free(m_argv[i]);
453 }
454
455 delete [] m_argv;
456 }
457
458 operator char**() const { return m_argv; }
459
460 private:
461 void Init(int argc)
462 {
463 m_argc = argc;
464 m_argv = new char *[m_argc + 1];
465 m_argv[m_argc] = NULL;
466 }
467
468 int m_argc;
469 char **m_argv;
470
471 wxDECLARE_NO_COPY_CLASS(ArgsArray);
472 };
473
474 } // anonymous namespace
475
476 // ----------------------------------------------------------------------------
477 // wxExecute implementations
478 // ----------------------------------------------------------------------------
479
480 #if defined(__DARWIN__)
481 bool wxMacLaunch(char **argv);
482 #endif
483
484 long wxExecute(const wxString& command, int flags, wxProcess *process,
485 const wxExecuteEnv *env)
486 {
487 ArgsArray argv(wxCmdLineParser::ConvertStringToArgs(command,
488 wxCMD_LINE_SPLIT_UNIX));
489
490 return wxExecute(argv, flags, process, env);
491 }
492
493 #if wxUSE_UNICODE
494
495 long wxExecute(wchar_t **wargv, int flags, wxProcess *process,
496 const wxExecuteEnv *env)
497 {
498 ArgsArray argv(wargv);
499
500 return wxExecute(argv, flags, process, env);
501 }
502
503 #endif // wxUSE_UNICODE
504
505 // wxExecute: the real worker function
506 long wxExecute(char **argv, int flags, wxProcess *process,
507 const wxExecuteEnv *env)
508 {
509 // for the sync execution, we return -1 to indicate failure, but for async
510 // case we return 0 which is never a valid PID
511 //
512 // we define this as a macro, not a variable, to avoid compiler warnings
513 // about "ERROR_RETURN_CODE value may be clobbered by fork()"
514 #define ERROR_RETURN_CODE ((flags & wxEXEC_SYNC) ? -1 : 0)
515
516 wxCHECK_MSG( *argv, ERROR_RETURN_CODE, wxT("can't exec empty command") );
517
518 #if wxUSE_THREADS
519 // fork() doesn't mix well with POSIX threads: on many systems the program
520 // deadlocks or crashes for some reason. Probably our code is buggy and
521 // doesn't do something which must be done to allow this to work, but I
522 // don't know what yet, so for now just warn the user (this is the least we
523 // can do) about it
524 wxASSERT_MSG( wxThread::IsMain(),
525 wxT("wxExecute() can be called only from the main thread") );
526 #endif // wxUSE_THREADS
527
528 #if defined(__WXCOCOA__) || ( defined(__WXOSX_MAC__) && wxOSX_USE_COCOA_OR_CARBON )
529 // wxMacLaunch() only executes app bundles and only does it asynchronously.
530 // It returns false if the target is not an app bundle, thus falling
531 // through to the regular code for non app bundles.
532 if ( !(flags & wxEXEC_SYNC) && wxMacLaunch(argv) )
533 {
534 // we don't have any PID to return so just make up something non null
535 return -1;
536 }
537 #endif // __DARWIN__
538
539
540 // this struct contains all information which we use for housekeeping
541 wxExecuteData execData;
542 execData.flags = flags;
543 execData.process = process;
544
545 // create pipes
546 if ( !execData.pipeEndProcDetect.Create() )
547 {
548 wxLogError( _("Failed to execute '%s'\n"), *argv );
549
550 return ERROR_RETURN_CODE;
551 }
552
553 // pipes for inter process communication
554 wxPipe pipeIn, // stdin
555 pipeOut, // stdout
556 pipeErr; // stderr
557
558 if ( process && process->IsRedirected() )
559 {
560 if ( !pipeIn.Create() || !pipeOut.Create() || !pipeErr.Create() )
561 {
562 wxLogError( _("Failed to execute '%s'\n"), *argv );
563
564 return ERROR_RETURN_CODE;
565 }
566 }
567
568 // fork the process
569 //
570 // NB: do *not* use vfork() here, it completely breaks this code for some
571 // reason under Solaris (and maybe others, although not under Linux)
572 // But on OpenVMS we do not have fork so we have to use vfork and
573 // cross our fingers that it works.
574 #ifdef __VMS
575 pid_t pid = vfork();
576 #else
577 pid_t pid = fork();
578 #endif
579 if ( pid == -1 ) // error?
580 {
581 wxLogSysError( _("Fork failed") );
582
583 return ERROR_RETURN_CODE;
584 }
585 else if ( pid == 0 ) // we're in child
586 {
587 // NB: we used to close all the unused descriptors of the child here
588 // but this broke some programs which relied on e.g. FD 1 being
589 // always opened so don't do it any more, after all there doesn't
590 // seem to be any real problem with keeping them opened
591
592 #if !defined(__VMS) && !defined(__EMX__)
593 if ( flags & wxEXEC_MAKE_GROUP_LEADER )
594 {
595 // Set process group to child process' pid. Then killing -pid
596 // of the parent will kill the process and all of its children.
597 setsid();
598 }
599 #endif // !__VMS
600
601 // redirect stdin, stdout and stderr
602 if ( pipeIn.IsOk() )
603 {
604 if ( dup2(pipeIn[wxPipe::Read], STDIN_FILENO) == -1 ||
605 dup2(pipeOut[wxPipe::Write], STDOUT_FILENO) == -1 ||
606 dup2(pipeErr[wxPipe::Write], STDERR_FILENO) == -1 )
607 {
608 wxLogSysError(_("Failed to redirect child process input/output"));
609 }
610
611 pipeIn.Close();
612 pipeOut.Close();
613 pipeErr.Close();
614 }
615
616 // Close all (presumably accidentally) inherited file descriptors to
617 // avoid descriptor leaks. This means that we don't allow inheriting
618 // them purposefully but this seems like a lesser evil in wx code.
619 // Ideally we'd provide some flag to indicate that none (or some?) of
620 // the descriptors do not need to be closed but for now this is better
621 // than never closing them at all as wx code never used FD_CLOEXEC.
622
623 // Note that while the reading side of the end process detection pipe
624 // can be safely closed, we should keep the write one opened, it will
625 // be only closed when the process terminates resulting in a read
626 // notification to the parent
627 const int fdEndProc = execData.pipeEndProcDetect.Detach(wxPipe::Write);
628 execData.pipeEndProcDetect.Close();
629
630 // TODO: Iterating up to FD_SETSIZE is both inefficient (because it may
631 // be quite big) and incorrect (because in principle we could
632 // have more opened descriptions than this number). Unfortunately
633 // there is no good portable solution for closing all descriptors
634 // above a certain threshold but non-portable solutions exist for
635 // most platforms, see [http://stackoverflow.com/questions/899038/
636 // getting-the-highest-allocated-file-descriptor]
637 for ( int fd = 0; fd < (int)FD_SETSIZE; ++fd )
638 {
639 if ( fd != STDIN_FILENO &&
640 fd != STDOUT_FILENO &&
641 fd != STDERR_FILENO &&
642 fd != fdEndProc )
643 {
644 close(fd);
645 }
646 }
647
648
649 // Process additional options if we have any
650 if ( env )
651 {
652 // Change working directory if it is specified
653 if ( !env->cwd.empty() )
654 wxSetWorkingDirectory(env->cwd);
655
656 // Change environment if needed.
657 //
658 // NB: We can't use execve() currently because we allow using
659 // non full paths to wxExecute(), i.e. we want to search for
660 // the program in PATH. However it just might be simpler/better
661 // to do the search manually and use execve() envp parameter to
662 // set up the environment of the child process explicitly
663 // instead of doing what we do below.
664 if ( !env->env.empty() )
665 {
666 wxEnvVariableHashMap oldenv;
667 wxGetEnvMap(&oldenv);
668
669 // Remove unwanted variables
670 wxEnvVariableHashMap::const_iterator it;
671 for ( it = oldenv.begin(); it != oldenv.end(); ++it )
672 {
673 if ( env->env.find(it->first) == env->env.end() )
674 wxUnsetEnv(it->first);
675 }
676
677 // And add the new ones (possibly replacing the old values)
678 for ( it = env->env.begin(); it != env->env.end(); ++it )
679 wxSetEnv(it->first, it->second);
680 }
681 }
682
683 execvp(*argv, argv);
684
685 fprintf(stderr, "execvp(");
686 for ( char **a = argv; *a; a++ )
687 fprintf(stderr, "%s%s", a == argv ? "" : ", ", *a);
688 fprintf(stderr, ") failed with error %d!\n", errno);
689
690 // there is no return after successful exec()
691 _exit(-1);
692
693 // some compilers complain about missing return - of course, they
694 // should know that exit() doesn't return but what else can we do if
695 // they don't?
696 //
697 // and, sure enough, other compilers complain about unreachable code
698 // after exit() call, so we can just always have return here...
699 #if defined(__VMS) || defined(__INTEL_COMPILER)
700 return 0;
701 #endif
702 }
703 else // we're in parent
704 {
705 // save it for WaitForChild() use
706 execData.pid = pid;
707 if (execData.process)
708 execData.process->SetPid(pid); // and also in the wxProcess
709
710 // prepare for IO redirection
711
712 #if HAS_PIPE_STREAMS
713 // the input buffer bufOut is connected to stdout, this is why it is
714 // called bufOut and not bufIn
715 wxStreamTempInputBuffer bufOut,
716 bufErr;
717
718 if ( process && process->IsRedirected() )
719 {
720 // Avoid deadlocks which could result from trying to write to the
721 // child input pipe end while the child itself is writing to its
722 // output end and waiting for us to read from it.
723 if ( !pipeIn.MakeNonBlocking(wxPipe::Write) )
724 {
725 // This message is not terrible useful for the user but what
726 // else can we do? Also, should we fail here or take the risk
727 // to continue and deadlock? Currently we choose the latter but
728 // it might not be the best idea.
729 wxLogSysError(_("Failed to set up non-blocking pipe, "
730 "the program might hang."));
731 wxLog::FlushActive();
732 }
733
734 wxOutputStream *inStream =
735 new wxPipeOutputStream(pipeIn.Detach(wxPipe::Write));
736
737 const int fdOut = pipeOut.Detach(wxPipe::Read);
738 wxPipeInputStream *outStream = new wxPipeInputStream(fdOut);
739
740 const int fdErr = pipeErr.Detach(wxPipe::Read);
741 wxPipeInputStream *errStream = new wxPipeInputStream(fdErr);
742
743 process->SetPipeStreams(outStream, inStream, errStream);
744
745 bufOut.Init(outStream);
746 bufErr.Init(errStream);
747
748 execData.bufOut = &bufOut;
749 execData.bufErr = &bufErr;
750
751 execData.fdOut = fdOut;
752 execData.fdErr = fdErr;
753 }
754 #endif // HAS_PIPE_STREAMS
755
756 if ( pipeIn.IsOk() )
757 {
758 pipeIn.Close();
759 pipeOut.Close();
760 pipeErr.Close();
761 }
762
763 // we want this function to work even if there is no wxApp so ensure
764 // that we have a valid traits pointer
765 wxConsoleAppTraits traitsConsole;
766 wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
767 if ( !traits )
768 traits = &traitsConsole;
769
770 return traits->WaitForChild(execData);
771 }
772
773 #if !defined(__VMS) && !defined(__INTEL_COMPILER)
774 return ERROR_RETURN_CODE;
775 #endif
776 }
777
778 #undef ERROR_RETURN_CODE
779
780 // ----------------------------------------------------------------------------
781 // file and directory functions
782 // ----------------------------------------------------------------------------
783
784 const wxChar* wxGetHomeDir( wxString *home )
785 {
786 *home = wxGetUserHome();
787 wxString tmp;
788 if ( home->empty() )
789 *home = wxT("/");
790 #ifdef __VMS
791 tmp = *home;
792 if ( tmp.Last() != wxT(']'))
793 if ( tmp.Last() != wxT('/')) *home << wxT('/');
794 #endif
795 return home->c_str();
796 }
797
798 wxString wxGetUserHome( const wxString &user )
799 {
800 struct passwd *who = (struct passwd *) NULL;
801
802 if ( !user )
803 {
804 wxChar *ptr;
805
806 if ((ptr = wxGetenv(wxT("HOME"))) != NULL)
807 {
808 return ptr;
809 }
810
811 if ((ptr = wxGetenv(wxT("USER"))) != NULL ||
812 (ptr = wxGetenv(wxT("LOGNAME"))) != NULL)
813 {
814 who = getpwnam(wxSafeConvertWX2MB(ptr));
815 }
816
817 // make sure the user exists!
818 if ( !who )
819 {
820 who = getpwuid(getuid());
821 }
822 }
823 else
824 {
825 who = getpwnam (user.mb_str());
826 }
827
828 return wxSafeConvertMB2WX(who ? who->pw_dir : 0);
829 }
830
831 // ----------------------------------------------------------------------------
832 // network and user id routines
833 // ----------------------------------------------------------------------------
834
835 // private utility function which returns output of the given command, removing
836 // the trailing newline
837 static wxString wxGetCommandOutput(const wxString &cmd)
838 {
839 FILE *f = popen(cmd.ToAscii(), "r");
840 if ( !f )
841 {
842 wxLogSysError(wxT("Executing \"%s\" failed"), cmd.c_str());
843 return wxEmptyString;
844 }
845
846 wxString s;
847 char buf[256];
848 while ( !feof(f) )
849 {
850 if ( !fgets(buf, sizeof(buf), f) )
851 break;
852
853 s += wxString::FromAscii(buf);
854 }
855
856 pclose(f);
857
858 if ( !s.empty() && s.Last() == wxT('\n') )
859 s.RemoveLast();
860
861 return s;
862 }
863
864 // retrieve either the hostname or FQDN depending on platform (caller must
865 // check whether it's one or the other, this is why this function is for
866 // private use only)
867 static bool wxGetHostNameInternal(wxChar *buf, int sz)
868 {
869 wxCHECK_MSG( buf, false, wxT("NULL pointer in wxGetHostNameInternal") );
870
871 *buf = wxT('\0');
872
873 // we're using uname() which is POSIX instead of less standard sysinfo()
874 #if defined(HAVE_UNAME)
875 struct utsname uts;
876 bool ok = uname(&uts) != -1;
877 if ( ok )
878 {
879 wxStrlcpy(buf, wxSafeConvertMB2WX(uts.nodename), sz);
880 }
881 #elif defined(HAVE_GETHOSTNAME)
882 char cbuf[sz];
883 bool ok = gethostname(cbuf, sz) != -1;
884 if ( ok )
885 {
886 wxStrlcpy(buf, wxSafeConvertMB2WX(cbuf), sz);
887 }
888 #else // no uname, no gethostname
889 wxFAIL_MSG(wxT("don't know host name for this machine"));
890
891 bool ok = false;
892 #endif // uname/gethostname
893
894 if ( !ok )
895 {
896 wxLogSysError(_("Cannot get the hostname"));
897 }
898
899 return ok;
900 }
901
902 bool wxGetHostName(wxChar *buf, int sz)
903 {
904 bool ok = wxGetHostNameInternal(buf, sz);
905
906 if ( ok )
907 {
908 // BSD systems return the FQDN, we only want the hostname, so extract
909 // it (we consider that dots are domain separators)
910 wxChar *dot = wxStrchr(buf, wxT('.'));
911 if ( dot )
912 {
913 // nuke it
914 *dot = wxT('\0');
915 }
916 }
917
918 return ok;
919 }
920
921 bool wxGetFullHostName(wxChar *buf, int sz)
922 {
923 bool ok = wxGetHostNameInternal(buf, sz);
924
925 if ( ok )
926 {
927 if ( !wxStrchr(buf, wxT('.')) )
928 {
929 struct hostent *host = gethostbyname(wxSafeConvertWX2MB(buf));
930 if ( !host )
931 {
932 wxLogSysError(_("Cannot get the official hostname"));
933
934 ok = false;
935 }
936 else
937 {
938 // the canonical name
939 wxStrlcpy(buf, wxSafeConvertMB2WX(host->h_name), sz);
940 }
941 }
942 //else: it's already a FQDN (BSD behaves this way)
943 }
944
945 return ok;
946 }
947
948 bool wxGetUserId(wxChar *buf, int sz)
949 {
950 struct passwd *who;
951
952 *buf = wxT('\0');
953 if ((who = getpwuid(getuid ())) != NULL)
954 {
955 wxStrlcpy (buf, wxSafeConvertMB2WX(who->pw_name), sz);
956 return true;
957 }
958
959 return false;
960 }
961
962 bool wxGetUserName(wxChar *buf, int sz)
963 {
964 #ifdef HAVE_PW_GECOS
965 struct passwd *who;
966
967 *buf = wxT('\0');
968 if ((who = getpwuid (getuid ())) != NULL)
969 {
970 char *comma = strchr(who->pw_gecos, ',');
971 if (comma)
972 *comma = '\0'; // cut off non-name comment fields
973 wxStrlcpy(buf, wxSafeConvertMB2WX(who->pw_gecos), sz);
974 return true;
975 }
976
977 return false;
978 #else // !HAVE_PW_GECOS
979 return wxGetUserId(buf, sz);
980 #endif // HAVE_PW_GECOS/!HAVE_PW_GECOS
981 }
982
983 bool wxIsPlatform64Bit()
984 {
985 const wxString machine = wxGetCommandOutput(wxT("uname -m"));
986
987 // the test for "64" is obviously not 100% reliable but seems to work fine
988 // in practice
989 return machine.Contains(wxT("64")) ||
990 machine.Contains(wxT("alpha"));
991 }
992
993 #ifdef __LINUX__
994 wxLinuxDistributionInfo wxGetLinuxDistributionInfo()
995 {
996 const wxString id = wxGetCommandOutput(wxT("lsb_release --id"));
997 const wxString desc = wxGetCommandOutput(wxT("lsb_release --description"));
998 const wxString rel = wxGetCommandOutput(wxT("lsb_release --release"));
999 const wxString codename = wxGetCommandOutput(wxT("lsb_release --codename"));
1000
1001 wxLinuxDistributionInfo ret;
1002
1003 id.StartsWith("Distributor ID:\t", &ret.Id);
1004 desc.StartsWith("Description:\t", &ret.Description);
1005 rel.StartsWith("Release:\t", &ret.Release);
1006 codename.StartsWith("Codename:\t", &ret.CodeName);
1007
1008 return ret;
1009 }
1010 #endif
1011
1012 // these functions are in src/osx/utilsexc_base.cpp for wxMac
1013 #ifndef __WXMAC__
1014
1015 wxOperatingSystemId wxGetOsVersion(int *verMaj, int *verMin)
1016 {
1017 // get OS version
1018 int major, minor;
1019 wxString release = wxGetCommandOutput(wxT("uname -r"));
1020 if ( release.empty() ||
1021 wxSscanf(release.c_str(), wxT("%d.%d"), &major, &minor) != 2 )
1022 {
1023 // failed to get version string or unrecognized format
1024 major =
1025 minor = -1;
1026 }
1027
1028 if ( verMaj )
1029 *verMaj = major;
1030 if ( verMin )
1031 *verMin = minor;
1032
1033 // try to understand which OS are we running
1034 wxString kernel = wxGetCommandOutput(wxT("uname -s"));
1035 if ( kernel.empty() )
1036 kernel = wxGetCommandOutput(wxT("uname -o"));
1037
1038 if ( kernel.empty() )
1039 return wxOS_UNKNOWN;
1040
1041 return wxPlatformInfo::GetOperatingSystemId(kernel);
1042 }
1043
1044 wxString wxGetOsDescription()
1045 {
1046 return wxGetCommandOutput(wxT("uname -s -r -m"));
1047 }
1048
1049 #endif // !__WXMAC__
1050
1051 unsigned long wxGetProcessId()
1052 {
1053 return (unsigned long)getpid();
1054 }
1055
1056 wxMemorySize wxGetFreeMemory()
1057 {
1058 #if defined(__LINUX__)
1059 // get it from /proc/meminfo
1060 FILE *fp = fopen("/proc/meminfo", "r");
1061 if ( fp )
1062 {
1063 long memFree = -1;
1064
1065 char buf[1024];
1066 if ( fgets(buf, WXSIZEOF(buf), fp) && fgets(buf, WXSIZEOF(buf), fp) )
1067 {
1068 // /proc/meminfo changed its format in kernel 2.6
1069 if ( wxPlatformInfo().CheckOSVersion(2, 6) )
1070 {
1071 unsigned long cached, buffers;
1072 sscanf(buf, "MemFree: %ld", &memFree);
1073
1074 fgets(buf, WXSIZEOF(buf), fp);
1075 sscanf(buf, "Buffers: %lu", &buffers);
1076
1077 fgets(buf, WXSIZEOF(buf), fp);
1078 sscanf(buf, "Cached: %lu", &cached);
1079
1080 // add to "MemFree" also the "Buffers" and "Cached" values as
1081 // free(1) does as otherwise the value never makes sense: for
1082 // kernel 2.6 it's always almost 0
1083 memFree += buffers + cached;
1084
1085 // values here are always expressed in kB and we want bytes
1086 memFree *= 1024;
1087 }
1088 else // Linux 2.4 (or < 2.6, anyhow)
1089 {
1090 long memTotal, memUsed;
1091 sscanf(buf, "Mem: %ld %ld %ld", &memTotal, &memUsed, &memFree);
1092 }
1093 }
1094
1095 fclose(fp);
1096
1097 return (wxMemorySize)memFree;
1098 }
1099 #elif defined(__SGI__)
1100 struct rminfo realmem;
1101 if ( sysmp(MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0 )
1102 return ((wxMemorySize)realmem.physmem * sysconf(_SC_PAGESIZE));
1103 #elif defined(_SC_AVPHYS_PAGES)
1104 return ((wxMemorySize)sysconf(_SC_AVPHYS_PAGES))*sysconf(_SC_PAGESIZE);
1105 //#elif defined(__FREEBSD__) -- might use sysctl() to find it out, probably
1106 #endif
1107
1108 // can't find it out
1109 return -1;
1110 }
1111
1112 bool wxGetDiskSpace(const wxString& path, wxDiskspaceSize_t *pTotal, wxDiskspaceSize_t *pFree)
1113 {
1114 #if defined(HAVE_STATFS) || defined(HAVE_STATVFS)
1115 // the case to "char *" is needed for AIX 4.3
1116 wxStatfs_t fs;
1117 if ( wxStatfs((char *)(const char*)path.fn_str(), &fs) != 0 )
1118 {
1119 wxLogSysError( wxT("Failed to get file system statistics") );
1120
1121 return false;
1122 }
1123
1124 // under Solaris we also have to use f_frsize field instead of f_bsize
1125 // which is in general a multiple of f_frsize
1126 #ifdef HAVE_STATVFS
1127 wxDiskspaceSize_t blockSize = fs.f_frsize;
1128 #else // HAVE_STATFS
1129 wxDiskspaceSize_t blockSize = fs.f_bsize;
1130 #endif // HAVE_STATVFS/HAVE_STATFS
1131
1132 if ( pTotal )
1133 {
1134 *pTotal = wxDiskspaceSize_t(fs.f_blocks) * blockSize;
1135 }
1136
1137 if ( pFree )
1138 {
1139 *pFree = wxDiskspaceSize_t(fs.f_bavail) * blockSize;
1140 }
1141
1142 return true;
1143 #else // !HAVE_STATFS && !HAVE_STATVFS
1144 return false;
1145 #endif // HAVE_STATFS
1146 }
1147
1148 // ----------------------------------------------------------------------------
1149 // env vars
1150 // ----------------------------------------------------------------------------
1151
1152 #if USE_PUTENV
1153
1154 WX_DECLARE_STRING_HASH_MAP(char *, wxEnvVars);
1155
1156 static wxEnvVars gs_envVars;
1157
1158 class wxSetEnvModule : public wxModule
1159 {
1160 public:
1161 virtual bool OnInit() { return true; }
1162 virtual void OnExit()
1163 {
1164 for ( wxEnvVars::const_iterator i = gs_envVars.begin();
1165 i != gs_envVars.end();
1166 ++i )
1167 {
1168 free(i->second);
1169 }
1170
1171 gs_envVars.clear();
1172 }
1173
1174 DECLARE_DYNAMIC_CLASS(wxSetEnvModule)
1175 };
1176
1177 IMPLEMENT_DYNAMIC_CLASS(wxSetEnvModule, wxModule)
1178
1179 #endif // USE_PUTENV
1180
1181 bool wxGetEnv(const wxString& var, wxString *value)
1182 {
1183 // wxGetenv is defined as getenv()
1184 char *p = wxGetenv(var);
1185 if ( !p )
1186 return false;
1187
1188 if ( value )
1189 {
1190 *value = p;
1191 }
1192
1193 return true;
1194 }
1195
1196 static bool wxDoSetEnv(const wxString& variable, const char *value)
1197 {
1198 #if defined(HAVE_SETENV)
1199 if ( !value )
1200 {
1201 #ifdef HAVE_UNSETENV
1202 // don't test unsetenv() return value: it's void on some systems (at
1203 // least Darwin)
1204 unsetenv(variable.mb_str());
1205 return true;
1206 #else
1207 value = ""; // we can't pass NULL to setenv()
1208 #endif
1209 }
1210
1211 return setenv(variable.mb_str(), value, 1 /* overwrite */) == 0;
1212 #elif defined(HAVE_PUTENV)
1213 wxString s = variable;
1214 if ( value )
1215 s << wxT('=') << value;
1216
1217 // transform to ANSI
1218 const wxWX2MBbuf p = s.mb_str();
1219
1220 char *buf = (char *)malloc(strlen(p) + 1);
1221 strcpy(buf, p);
1222
1223 // store the string to free() it later
1224 wxEnvVars::iterator i = gs_envVars.find(variable);
1225 if ( i != gs_envVars.end() )
1226 {
1227 free(i->second);
1228 i->second = buf;
1229 }
1230 else // this variable hadn't been set before
1231 {
1232 gs_envVars[variable] = buf;
1233 }
1234
1235 return putenv(buf) == 0;
1236 #else // no way to set an env var
1237 return false;
1238 #endif
1239 }
1240
1241 bool wxSetEnv(const wxString& variable, const wxString& value)
1242 {
1243 return wxDoSetEnv(variable, value.mb_str());
1244 }
1245
1246 bool wxUnsetEnv(const wxString& variable)
1247 {
1248 return wxDoSetEnv(variable, NULL);
1249 }
1250
1251 // ----------------------------------------------------------------------------
1252 // signal handling
1253 // ----------------------------------------------------------------------------
1254
1255 #if wxUSE_ON_FATAL_EXCEPTION
1256
1257 #include <signal.h>
1258
1259 extern "C" void wxFatalSignalHandler(wxTYPE_SA_HANDLER)
1260 {
1261 if ( wxTheApp )
1262 {
1263 // give the user a chance to do something special about this
1264 wxTheApp->OnFatalException();
1265 }
1266
1267 abort();
1268 }
1269
1270 bool wxHandleFatalExceptions(bool doit)
1271 {
1272 // old sig handlers
1273 static bool s_savedHandlers = false;
1274 static struct sigaction s_handlerFPE,
1275 s_handlerILL,
1276 s_handlerBUS,
1277 s_handlerSEGV;
1278
1279 bool ok = true;
1280 if ( doit && !s_savedHandlers )
1281 {
1282 // install the signal handler
1283 struct sigaction act;
1284
1285 // some systems extend it with non std fields, so zero everything
1286 memset(&act, 0, sizeof(act));
1287
1288 act.sa_handler = wxFatalSignalHandler;
1289 sigemptyset(&act.sa_mask);
1290 act.sa_flags = 0;
1291
1292 ok &= sigaction(SIGFPE, &act, &s_handlerFPE) == 0;
1293 ok &= sigaction(SIGILL, &act, &s_handlerILL) == 0;
1294 ok &= sigaction(SIGBUS, &act, &s_handlerBUS) == 0;
1295 ok &= sigaction(SIGSEGV, &act, &s_handlerSEGV) == 0;
1296 if ( !ok )
1297 {
1298 wxLogDebug(wxT("Failed to install our signal handler."));
1299 }
1300
1301 s_savedHandlers = true;
1302 }
1303 else if ( s_savedHandlers )
1304 {
1305 // uninstall the signal handler
1306 ok &= sigaction(SIGFPE, &s_handlerFPE, NULL) == 0;
1307 ok &= sigaction(SIGILL, &s_handlerILL, NULL) == 0;
1308 ok &= sigaction(SIGBUS, &s_handlerBUS, NULL) == 0;
1309 ok &= sigaction(SIGSEGV, &s_handlerSEGV, NULL) == 0;
1310 if ( !ok )
1311 {
1312 wxLogDebug(wxT("Failed to uninstall our signal handler."));
1313 }
1314
1315 s_savedHandlers = false;
1316 }
1317 //else: nothing to do
1318
1319 return ok;
1320 }
1321
1322 #endif // wxUSE_ON_FATAL_EXCEPTION
1323
1324 // ----------------------------------------------------------------------------
1325 // wxExecute support
1326 // ----------------------------------------------------------------------------
1327
1328 int wxAppTraits::AddProcessCallback(wxEndProcessData *data, int fd)
1329 {
1330 // define a custom handler processing only the closure of the descriptor
1331 struct wxEndProcessFDIOHandler : public wxFDIOHandler
1332 {
1333 wxEndProcessFDIOHandler(wxEndProcessData *data, int fd)
1334 : m_data(data), m_fd(fd)
1335 {
1336 }
1337
1338 virtual void OnReadWaiting()
1339 {
1340 wxFDIODispatcher::Get()->UnregisterFD(m_fd);
1341 close(m_fd);
1342
1343 wxHandleProcessTermination(m_data);
1344
1345 delete this;
1346 }
1347
1348 virtual void OnWriteWaiting() { wxFAIL_MSG("unreachable"); }
1349 virtual void OnExceptionWaiting() { wxFAIL_MSG("unreachable"); }
1350
1351 wxEndProcessData * const m_data;
1352 const int m_fd;
1353 };
1354
1355 wxFDIODispatcher::Get()->RegisterFD
1356 (
1357 fd,
1358 new wxEndProcessFDIOHandler(data, fd),
1359 wxFDIO_INPUT
1360 );
1361 return fd; // unused, but return something unique for the tag
1362 }
1363
1364 bool wxAppTraits::CheckForRedirectedIO(wxExecuteData& execData)
1365 {
1366 #if HAS_PIPE_STREAMS
1367 bool hasIO = false;
1368
1369 if ( execData.bufOut && execData.bufOut->Update() )
1370 hasIO = true;
1371
1372 if ( execData.bufErr && execData.bufErr->Update() )
1373 hasIO = true;
1374
1375 return hasIO;
1376 #else // !HAS_PIPE_STREAMS
1377 wxUnusedVar(execData);
1378
1379 return false;
1380 #endif // HAS_PIPE_STREAMS/!HAS_PIPE_STREAMS
1381 }
1382
1383 // helper classes/functions used by WaitForChild()
1384 namespace
1385 {
1386
1387 // convenient base class for IO handlers which are registered for read
1388 // notifications only and which also stores the FD we're reading from
1389 //
1390 // the derived classes still have to implement OnReadWaiting()
1391 class wxReadFDIOHandler : public wxFDIOHandler
1392 {
1393 public:
1394 wxReadFDIOHandler(wxFDIODispatcher& disp, int fd) : m_fd(fd)
1395 {
1396 if ( fd )
1397 disp.RegisterFD(fd, this, wxFDIO_INPUT);
1398 }
1399
1400 virtual void OnWriteWaiting() { wxFAIL_MSG("unreachable"); }
1401 virtual void OnExceptionWaiting() { wxFAIL_MSG("unreachable"); }
1402
1403 protected:
1404 const int m_fd;
1405
1406 wxDECLARE_NO_COPY_CLASS(wxReadFDIOHandler);
1407 };
1408
1409 // class for monitoring our end of the process detection pipe, simply sets a
1410 // flag when input on the pipe (which must be due to EOF) is detected
1411 class wxEndHandler : public wxReadFDIOHandler
1412 {
1413 public:
1414 wxEndHandler(wxFDIODispatcher& disp, int fd)
1415 : wxReadFDIOHandler(disp, fd)
1416 {
1417 m_terminated = false;
1418 }
1419
1420 bool Terminated() const { return m_terminated; }
1421
1422 virtual void OnReadWaiting() { m_terminated = true; }
1423
1424 private:
1425 bool m_terminated;
1426
1427 wxDECLARE_NO_COPY_CLASS(wxEndHandler);
1428 };
1429
1430 #if HAS_PIPE_STREAMS
1431
1432 // class for monitoring our ends of child stdout/err, should be constructed
1433 // with the FD and stream from wxExecuteData and will do nothing if they're
1434 // invalid
1435 //
1436 // unlike wxEndHandler this class registers itself with the provided dispatcher
1437 class wxRedirectedIOHandler : public wxReadFDIOHandler
1438 {
1439 public:
1440 wxRedirectedIOHandler(wxFDIODispatcher& disp,
1441 int fd,
1442 wxStreamTempInputBuffer *buf)
1443 : wxReadFDIOHandler(disp, fd),
1444 m_buf(buf)
1445 {
1446 }
1447
1448 virtual void OnReadWaiting()
1449 {
1450 m_buf->Update();
1451 }
1452
1453 private:
1454 wxStreamTempInputBuffer * const m_buf;
1455
1456 wxDECLARE_NO_COPY_CLASS(wxRedirectedIOHandler);
1457 };
1458
1459 #endif // HAS_PIPE_STREAMS
1460
1461 // helper function which calls waitpid() and analyzes the result
1462 int DoWaitForChild(int pid, int flags = 0)
1463 {
1464 wxASSERT_MSG( pid > 0, "invalid PID" );
1465
1466 int status, rc;
1467
1468 // loop while we're getting EINTR
1469 for ( ;; )
1470 {
1471 rc = waitpid(pid, &status, flags);
1472
1473 if ( rc != -1 || errno != EINTR )
1474 break;
1475 }
1476
1477 if ( rc == 0 )
1478 {
1479 // This can only happen if the child application closes our dummy pipe
1480 // that is used to monitor its lifetime; in that case, our best bet is
1481 // to pretend the process did terminate, because otherwise wxExecute()
1482 // would hang indefinitely (OnReadWaiting() won't be called again, the
1483 // descriptor is closed now).
1484 wxLogDebug("Child process (PID %d) still alive but pipe closed so "
1485 "generating a close notification", pid);
1486 }
1487 else if ( rc == -1 )
1488 {
1489 wxLogLastError(wxString::Format("waitpid(%d)", pid));
1490 }
1491 else // child did terminate
1492 {
1493 wxASSERT_MSG( rc == pid, "unexpected waitpid() return value" );
1494
1495 // notice that the caller expects the exit code to be signed, e.g. -1
1496 // instead of 255 so don't assign WEXITSTATUS() to an int
1497 signed char exitcode;
1498 if ( WIFEXITED(status) )
1499 exitcode = WEXITSTATUS(status);
1500 else if ( WIFSIGNALED(status) )
1501 exitcode = -WTERMSIG(status);
1502 else
1503 {
1504 wxLogError("Child process (PID %d) exited for unknown reason, "
1505 "status = %d", pid, status);
1506 exitcode = -1;
1507 }
1508
1509 return exitcode;
1510 }
1511
1512 return -1;
1513 }
1514
1515 } // anonymous namespace
1516
1517 int wxAppTraits::WaitForChild(wxExecuteData& execData)
1518 {
1519 if ( !(execData.flags & wxEXEC_SYNC) )
1520 {
1521 // asynchronous execution: just launch the process and return,
1522 // endProcData will be destroyed when it terminates (currently we leak
1523 // it if the process doesn't terminate before we do and this should be
1524 // fixed but it's not a real leak so it's not really very high
1525 // priority)
1526 wxEndProcessData *endProcData = new wxEndProcessData;
1527 endProcData->process = execData.process;
1528 endProcData->pid = execData.pid;
1529 endProcData->tag = AddProcessCallback
1530 (
1531 endProcData,
1532 execData.GetEndProcReadFD()
1533 );
1534 endProcData->async = true;
1535
1536 return execData.pid;
1537 }
1538 //else: synchronous execution case
1539
1540 #if HAS_PIPE_STREAMS && wxUSE_SOCKETS
1541 wxProcess * const process = execData.process;
1542 if ( process && process->IsRedirected() )
1543 {
1544 // we can't simply block waiting for the child to terminate as we would
1545 // dead lock if it writes more than the pipe buffer size (typically
1546 // 4KB) bytes of output -- it would then block waiting for us to read
1547 // the data while we'd block waiting for it to terminate
1548 //
1549 // so multiplex here waiting for any input from the child or closure of
1550 // the pipe used to indicate its termination
1551 wxSelectDispatcher disp;
1552
1553 wxEndHandler endHandler(disp, execData.GetEndProcReadFD());
1554
1555 wxRedirectedIOHandler outHandler(disp, execData.fdOut, execData.bufOut),
1556 errHandler(disp, execData.fdErr, execData.bufErr);
1557
1558 while ( !endHandler.Terminated() )
1559 {
1560 disp.Dispatch();
1561 }
1562 }
1563 //else: no IO redirection, just block waiting for the child to exit
1564 #endif // HAS_PIPE_STREAMS
1565
1566 return DoWaitForChild(execData.pid);
1567 }
1568
1569 void wxHandleProcessTermination(wxEndProcessData *data)
1570 {
1571 data->exitcode = DoWaitForChild(data->pid, WNOHANG);
1572
1573 // notify user about termination if required
1574 if ( data->process )
1575 {
1576 data->process->OnTerminate(data->pid, data->exitcode);
1577 }
1578
1579 if ( data->async )
1580 {
1581 // in case of asynchronous execution we don't need this data any more
1582 // after the child terminates
1583 delete data;
1584 }
1585 else // sync execution
1586 {
1587 // let wxExecute() know that the process has terminated
1588 data->pid = 0;
1589 }
1590 }
1591