X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/1d043598b7e6baae2e0a472a4133b8d60f0f45ec..2ff0354a3a81557f70a8811a63769b6a42fa4084:/src/unix/utilsunx.cpp

diff --git a/src/unix/utilsunx.cpp b/src/unix/utilsunx.cpp
index e47af5bf55..1c92ba8982 100644
--- a/src/unix/utilsunx.cpp
+++ b/src/unix/utilsunx.cpp
@@ -1,6 +1,6 @@
 /////////////////////////////////////////////////////////////////////////////
 // Name:        src/unix/utilsunx.cpp
-// Purpose:     generic Unix implementation of many wx functions
+// Purpose:     generic Unix implementation of many wx functions (for wxBase)
 // Author:      Vadim Zeitlin
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling, Vadim Zeitlin
@@ -39,8 +39,11 @@
 #include "wx/process.h"
 #include "wx/thread.h"
 
+#include "wx/cmdline.h"
+
 #include "wx/wfstream.h"
 
+#include "wx/private/selectdispatcher.h"
 #include "wx/private/fdiodispatcher.h"
 #include "wx/unix/execute.h"
 #include "wx/unix/private.h"
@@ -66,8 +69,6 @@
 
 #endif // HAS_PIPE_INPUT_STREAM
 
-#if wxUSE_BASE
-
 #if defined(__MWERKS__) && defined(__MACH__)
     #ifndef WXWIN_OS_DESCRIPTION
         #define WXWIN_OS_DESCRIPTION "MacOS X"
@@ -201,7 +202,7 @@ void wxMicroSleep(unsigned long microseconds)
     tmReq.tv_nsec = (microseconds % 1000000) * 1000;
 
     // we're not interested in remaining time nor in return value
-    (void)nanosleep(&tmReq, (timespec *)NULL);
+    (void)nanosleep(&tmReq, NULL);
 #elif defined(HAVE_USLEEP)
     // uncomment this if you feel brave or if you are sure that your version
     // of Solaris has a safe usleep() function but please notice that usleep()
@@ -264,106 +265,80 @@ int wxKill(long pid, wxSignal sig, wxKillError *rc, int flags)
     return err;
 }
 
-#define WXEXECUTE_NARGS   127
-
-#if defined(__DARWIN__)
-long wxMacExecute(wxChar **argv,
-               int flags,
-               wxProcess *process);
-#endif
-
-long wxExecute( const wxString& command, int flags, wxProcess *process )
+// Shutdown or reboot the PC
+bool wxShutdown(int flags)
 {
-    wxCHECK_MSG( !command.empty(), 0, wxT("can't exec empty command") );
+    flags &= ~wxSHUTDOWN_FORCE;
 
-    wxLogTrace(wxT("exec"), wxT("Executing \"%s\""), command.c_str());
+    wxChar level;
+    switch ( flags )
+    {
+        case wxSHUTDOWN_POWEROFF:
+            level = _T('0');
+            break;
 
-#if wxUSE_THREADS
-    // fork() doesn't mix well with POSIX threads: on many systems the program
-    // deadlocks or crashes for some reason. Probably our code is buggy and
-    // doesn't do something which must be done to allow this to work, but I
-    // don't know what yet, so for now just warn the user (this is the least we
-    // can do) about it
-    wxASSERT_MSG( wxThread::IsMain(),
-                    _T("wxExecute() can be called only from the main thread") );
-#endif // wxUSE_THREADS
+        case wxSHUTDOWN_REBOOT:
+            level = _T('6');
+            break;
 
-    int argc = 0;
-    wxChar *argv[WXEXECUTE_NARGS];
-    wxString argument;
-    const wxChar *cptr = command.c_str();
-    wxChar quotechar = wxT('\0'); // is arg quoted?
-    bool escaped = false;
+        case wxSHUTDOWN_LOGOFF:
+            // TODO: use dcop to log off?
+            return false;
 
-    // split the command line in arguments
-    do
-    {
-        argument = wxEmptyString;
-        quotechar = wxT('\0');
+        default:
+            wxFAIL_MSG( _T("unknown wxShutdown() flag") );
+            return false;
+    }
 
-        // eat leading whitespace:
-        while ( wxIsspace(*cptr) )
-            cptr++;
+    return system(wxString::Format("init %c", level).mb_str()) == 0;
+}
 
-        if ( *cptr == wxT('\'') || *cptr == wxT('"') )
-            quotechar = *cptr++;
+// ----------------------------------------------------------------------------
+// wxStream classes to support IO redirection in wxExecute
+// ----------------------------------------------------------------------------
 
-        do
-        {
-            if ( *cptr == wxT('\\') && ! escaped )
-            {
-                escaped = true;
-                cptr++;
-                continue;
-            }
+#if HAS_PIPE_INPUT_STREAM
 
-            // all other characters:
-            argument += *cptr++;
-            escaped = false;
+bool wxPipeInputStream::CanRead() const
+{
+    if ( m_lasterror == wxSTREAM_EOF )
+        return false;
 
-            // have we reached the end of the argument?
-            if ( (*cptr == quotechar && ! escaped)
-                 || (quotechar == wxT('\0') && wxIsspace(*cptr))
-                 || *cptr == wxT('\0') )
-            {
-                wxASSERT_MSG( argc < WXEXECUTE_NARGS,
-                              wxT("too many arguments in wxExecute") );
+    // check if there is any input available
+    struct timeval tv;
+    tv.tv_sec = 0;
+    tv.tv_usec = 0;
 
-                argv[argc] = new wxChar[argument.length() + 1];
-                wxStrcpy(argv[argc], argument.c_str());
-                argc++;
+    const int fd = m_file->fd();
 
-                // if not at end of buffer, swallow last character:
-                if(*cptr)
-                    cptr++;
+    fd_set readfds;
 
-                break; // done with this one, start over
-            }
-        } while(*cptr);
-    } while(*cptr);
-    argv[argc] = NULL;
+    wxFD_ZERO(&readfds);
+    wxFD_SET(fd, &readfds);
 
-    long lRc;
-#if defined(__DARWIN__)
-    // wxMacExecute only executes app bundles.
-    // It returns an error code if the target is not an app bundle, thus falling
-    // through to the regular wxExecute for non app bundles.
-    lRc = wxMacExecute(argv, flags, process);
-    if( lRc != ((flags & wxEXEC_SYNC) ? -1 : 0))
-        return lRc;
-#endif
+    switch ( select(fd + 1, &readfds, NULL, NULL, &tv) )
+    {
+        case -1:
+            wxLogSysError(_("Impossible to get child process input"));
+            // fall through
 
-    // do execute the command
-    lRc = wxExecute(argv, flags, process);
+        case 0:
+            return false;
 
-    // clean up
-    argc = 0;
-    while( argv[argc] )
-        delete [] argv[argc++];
+        default:
+            wxFAIL_MSG(_T("unexpected select() return value"));
+            // still fall through
 
-    return lRc;
+        case 1:
+            // input available -- or maybe not, as select() returns 1 when a
+            // read() will complete without delay, but it could still not read
+            // anything
+            return !Eof();
+    }
 }
 
+#endif // HAS_PIPE_INPUT_STREAM
+
 // ----------------------------------------------------------------------------
 // wxShell
 // ----------------------------------------------------------------------------
@@ -397,79 +372,97 @@ bool wxShell(const wxString& command, wxArrayString& output)
     return wxExecute(wxMakeShellCommand(command), output);
 }
 
-// Shutdown or reboot the PC
-bool wxShutdown(wxShutdownFlags wFlags)
+namespace
 {
-    wxChar level;
-    switch ( wFlags )
+
+// helper class for storing arguments as char** array suitable for passing to
+// execvp(), whatever form they were passed to us
+class ArgsArray
+{
+public:
+    ArgsArray(const wxArrayString& args)
     {
-        case wxSHUTDOWN_POWEROFF:
-            level = _T('0');
-            break;
+        Init(args.size());
 
-        case wxSHUTDOWN_REBOOT:
-            level = _T('6');
-            break;
+        for ( int i = 0; i < m_argc; i++ )
+        {
+            m_argv[i] = wxStrdup(args[i]);
+        }
+    }
 
-        default:
-            wxFAIL_MSG( _T("unknown wxShutdown() flag") );
-            return false;
+#if wxUSE_UNICODE
+    ArgsArray(wchar_t **wargv)
+    {
+        int argc = 0;
+        while ( *wargv++ )
+            argc++;
+
+        Init(argc);
+
+        for ( int i = 0; i < m_argc; i++ )
+        {
+            m_argv[i] = wxSafeConvertWX2MB(wargv[i]).release();
+        }
     }
+#endif // wxUSE_UNICODE
 
-    return system(wxString::Format(_T("init %c"), level).mb_str()) == 0;
-}
+    ~ArgsArray()
+    {
+        for ( int i = 0; i < m_argc; i++ )
+        {
+            free(m_argv[i]);
+        }
 
-// ----------------------------------------------------------------------------
-// wxStream classes to support IO redirection in wxExecute
-// ----------------------------------------------------------------------------
+        delete [] m_argv;
+    }
 
-#if HAS_PIPE_INPUT_STREAM
+    operator char**() const { return m_argv; }
 
-bool wxPipeInputStream::CanRead() const
-{
-    if ( m_lasterror == wxSTREAM_EOF )
-        return false;
+private:
+    void Init(int argc)
+    {
+        m_argc = argc;
+        m_argv = new char *[m_argc + 1];
+        m_argv[m_argc] = NULL;
+    }
 
-    // check if there is any input available
-    struct timeval tv;
-    tv.tv_sec = 0;
-    tv.tv_usec = 0;
+    int m_argc;
+    char **m_argv;
 
-    const int fd = m_file->fd();
+    wxDECLARE_NO_COPY_CLASS(ArgsArray);
+};
 
-    fd_set readfds;
+} // anonymous namespace
 
-    wxFD_ZERO(&readfds);
-    wxFD_SET(fd, &readfds);
+// ----------------------------------------------------------------------------
+// wxExecute implementations
+// ----------------------------------------------------------------------------
 
-    switch ( select(fd + 1, &readfds, NULL, NULL, &tv) )
-    {
-        case -1:
-            wxLogSysError(_("Impossible to get child process input"));
-            // fall through
+#if defined(__DARWIN__)
+bool wxMacLaunch(char **argv);
+#endif
 
-        case 0:
-            return false;
+long wxExecute(const wxString& command, int flags, wxProcess *process)
+{
+    ArgsArray argv(wxCmdLineParser::ConvertStringToArgs(command,
+                                                        wxCMD_LINE_SPLIT_UNIX));
 
-        default:
-            wxFAIL_MSG(_T("unexpected select() return value"));
-            // still fall through
+    return wxExecute(argv, flags, process);
+}
 
-        case 1:
-            // input available -- or maybe not, as select() returns 1 when a
-            // read() will complete without delay, but it could still not read
-            // anything
-            return !Eof();
-    }
+#if wxUSE_UNICODE
+
+long wxExecute(wchar_t **wargv, int flags, wxProcess *process)
+{
+    ArgsArray argv(wargv);
+
+    return wxExecute(argv, flags, process);
 }
 
-#endif // HAS_PIPE_INPUT_STREAM
+#endif // wxUSE_UNICODE
 
-// ----------------------------------------------------------------------------
 // wxExecute: the real worker function
-// ----------------------------------------------------------------------------
-
-long wxExecute(wxChar **argv, int flags, wxProcess *process)
+long wxExecute(char **argv, int flags, wxProcess *process)
 {
     // for the sync execution, we return -1 to indicate failure, but for async
     // case we return 0 which is never a valid PID
@@ -480,49 +473,38 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process)
 
     wxCHECK_MSG( *argv, ERROR_RETURN_CODE, wxT("can't exec empty command") );
 
-#if wxUSE_UNICODE
-    int mb_argc = 0;
-    char *mb_argv[WXEXECUTE_NARGS];
+#if wxUSE_THREADS
+    // fork() doesn't mix well with POSIX threads: on many systems the program
+    // deadlocks or crashes for some reason. Probably our code is buggy and
+    // doesn't do something which must be done to allow this to work, but I
+    // don't know what yet, so for now just warn the user (this is the least we
+    // can do) about it
+    wxASSERT_MSG( wxThread::IsMain(),
+                    _T("wxExecute() can be called only from the main thread") );
+#endif // wxUSE_THREADS
 
-    while (argv[mb_argc])
+#if defined(__WXCOCOA__) || ( defined(__WXOSX_MAC__) && wxOSX_USE_COCOA_OR_CARBON )
+    // wxMacLaunch() only executes app bundles and only does it asynchronously.
+    // It returns false if the target is not an app bundle, thus falling
+    // through to the regular code for non app bundles.
+    if ( !(flags & wxEXEC_SYNC) && wxMacLaunch(argv) )
     {
-        wxWX2MBbuf mb_arg = wxSafeConvertWX2MB(argv[mb_argc]);
-        mb_argv[mb_argc] = strdup(mb_arg);
-        mb_argc++;
+        // we don't have any PID to return so just make up something non null
+        return -1;
     }
-    mb_argv[mb_argc] = (char *) NULL;
-
-    // this macro will free memory we used above
-    #define ARGS_CLEANUP                                 \
-        for ( mb_argc = 0; mb_argv[mb_argc]; mb_argc++ ) \
-            free(mb_argv[mb_argc])
-#else // ANSI
-    // no need for cleanup
-    #define ARGS_CLEANUP
-
-    wxChar **mb_argv = argv;
-#endif // Unicode/ANSI
-
-    // we want this function to work even if there is no wxApp so ensure that
-    // we have a valid traits pointer
-    wxConsoleAppTraits traitsConsole;
-    wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
-    if ( !traits )
-        traits = &traitsConsole;
-
-    // this struct contains all information which we pass to and from
-    // wxAppTraits methods
+#endif // __DARWIN__
+
+
+    // this struct contains all information which we use for housekeeping
     wxExecuteData execData;
     execData.flags = flags;
     execData.process = process;
 
     // create pipes
-    if ( !traits->CreateEndProcessPipe(execData) )
+    if ( !execData.pipeEndProcDetect.Create() )
     {
         wxLogError( _("Failed to execute '%s'\n"), *argv );
 
-        ARGS_CLEANUP;
-
         return ERROR_RETURN_CODE;
     }
 
@@ -537,8 +519,6 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process)
         {
             wxLogError( _("Failed to execute '%s'\n"), *argv );
 
-            ARGS_CLEANUP;
-
             return ERROR_RETURN_CODE;
         }
     }
@@ -558,36 +538,14 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process)
     {
         wxLogSysError( _("Fork failed") );
 
-        ARGS_CLEANUP;
-
         return ERROR_RETURN_CODE;
     }
     else if ( pid == 0 )  // we're in child
     {
-        // These lines close the open file descriptors to to avoid any
-        // input/output which might block the process or irritate the user. If
-        // one wants proper IO for the subprocess, the right thing to do is to
-        // start an xterm executing it.
-        if ( !(flags & wxEXEC_SYNC) )
-        {
-            // FD_SETSIZE is unsigned under BSD, signed under other platforms
-            // so we need a cast to avoid warnings on all platforms
-            for ( int fd = 0; fd < (int)FD_SETSIZE; fd++ )
-            {
-                if ( fd == pipeIn[wxPipe::Read]
-                        || fd == pipeOut[wxPipe::Write]
-                        || fd == pipeErr[wxPipe::Write]
-                        || traits->IsWriteFDOfEndProcessPipe(execData, fd) )
-                {
-                    // don't close this one, we still need it
-                    continue;
-                }
-
-                // leave stderr opened too, it won't do any harm
-                if ( fd != STDERR_FILENO )
-                    close(fd);
-            }
-        }
+        // NB: we used to close all the unused descriptors of the child here
+        //     but this broke some programs which relied on e.g. FD 1 being
+        //     always opened so don't do it any more, after all there doesn't
+        //     seem to be any real problem with keeping them opened
 
 #if !defined(__VMS) && !defined(__EMX__)
         if ( flags & wxEXEC_MAKE_GROUP_LEADER )
@@ -599,8 +557,10 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process)
 #endif // !__VMS
 
         // reading side can be safely closed but we should keep the write one
-        // opened
-        traits->DetachWriteFDOfEndProcessPipe(execData);
+        // opened, it will be only closed when the process terminates resulting
+        // in a read notification to the parent
+        execData.pipeEndProcDetect.Detach(wxPipe::Write);
+        execData.pipeEndProcDetect.Close();
 
         // redirect stdin, stdout and stderr
         if ( pipeIn.IsOk() )
@@ -617,12 +577,11 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process)
             pipeErr.Close();
         }
 
-        execvp (*mb_argv, mb_argv);
+        execvp(*argv, argv);
 
         fprintf(stderr, "execvp(");
-        // CS changed ppc to ppc_ as ppc is not available under mac os CW Mach-O
-        for ( char **ppc_ = mb_argv; *ppc_; ppc_++ )
-            fprintf(stderr, "%s%s", ppc_ == mb_argv ? "" : ", ", *ppc_);
+        for ( char **a = argv; *a; a++ )
+            fprintf(stderr, "%s%s", a == argv ? "" : ", ", *a);
         fprintf(stderr, ") failed with error %d!\n", errno);
 
         // there is no return after successful exec()
@@ -640,10 +599,10 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process)
     }
     else // we're in parent
     {
-        ARGS_CLEANUP;
-
         // save it for WaitForChild() use
         execData.pid = pid;
+        if (execData.process)
+            execData.process->SetPid(pid);  // and also in the wxProcess
 
         // prepare for IO redirection
 
@@ -652,19 +611,17 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process)
         // called bufOut and not bufIn
         wxStreamTempInputBuffer bufOut,
                                 bufErr;
-#endif // HAS_PIPE_INPUT_STREAM
 
         if ( process && process->IsRedirected() )
         {
-#if HAS_PIPE_INPUT_STREAM
             wxOutputStream *inStream =
                 new wxFileOutputStream(pipeIn.Detach(wxPipe::Write));
 
-            wxPipeInputStream *outStream =
-                new wxPipeInputStream(pipeOut.Detach(wxPipe::Read));
+            const int fdOut = pipeOut.Detach(wxPipe::Read);
+            wxPipeInputStream *outStream = new wxPipeInputStream(fdOut);
 
-            wxPipeInputStream *errStream =
-                new wxPipeInputStream(pipeErr.Detach(wxPipe::Read));
+            const int fdErr = pipeErr.Detach(wxPipe::Read);
+            wxPipeInputStream *errStream = new wxPipeInputStream(fdErr);
 
             process->SetPipeStreams(outStream, inStream, errStream);
 
@@ -673,8 +630,11 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process)
 
             execData.bufOut = &bufOut;
             execData.bufErr = &bufErr;
-#endif // HAS_PIPE_INPUT_STREAM
+
+            execData.fdOut = fdOut;
+            execData.fdErr = fdErr;
         }
+#endif // HAS_PIPE_INPUT_STREAM
 
         if ( pipeIn.IsOk() )
         {
@@ -683,6 +643,13 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process)
             pipeErr.Close();
         }
 
+        // we want this function to work even if there is no wxApp so ensure
+        // that we have a valid traits pointer
+        wxConsoleAppTraits traitsConsole;
+        wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
+        if ( !traits )
+            traits = &traitsConsole;
+
         return traits->WaitForChild(execData);
     }
 
@@ -692,7 +659,6 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process)
 }
 
 #undef ERROR_RETURN_CODE
-#undef ARGS_CLEANUP
 
 // ----------------------------------------------------------------------------
 // file and directory functions
@@ -793,16 +759,14 @@ static bool wxGetHostNameInternal(wxChar *buf, int sz)
     bool ok = uname(&uts) != -1;
     if ( ok )
     {
-        wxStrncpy(buf, wxSafeConvertMB2WX(uts.nodename), sz - 1);
-        buf[sz] = wxT('\0');
+        wxStrlcpy(buf, wxSafeConvertMB2WX(uts.nodename), sz);
     }
 #elif defined(HAVE_GETHOSTNAME)
     char cbuf[sz];
     bool ok = gethostname(cbuf, sz) != -1;
     if ( ok )
     {
-        wxStrncpy(buf, wxSafeConvertMB2WX(cbuf), sz - 1);
-        buf[sz] = wxT('\0');
+        wxStrlcpy(buf, wxSafeConvertMB2WX(cbuf), sz);
     }
 #else // no uname, no gethostname
     wxFAIL_MSG(wxT("don't know host name for this machine"));
@@ -855,7 +819,7 @@ bool wxGetFullHostName(wxChar *buf, int sz)
             else
             {
                 // the canonical name
-                wxStrncpy(buf, wxSafeConvertMB2WX(host->h_name), sz);
+                wxStrlcpy(buf, wxSafeConvertMB2WX(host->h_name), sz);
             }
         }
         //else: it's already a FQDN (BSD behaves this way)
@@ -871,7 +835,7 @@ bool wxGetUserId(wxChar *buf, int sz)
     *buf = wxT('\0');
     if ((who = getpwuid(getuid ())) != NULL)
     {
-        wxStrncpy (buf, wxSafeConvertMB2WX(who->pw_name), sz - 1);
+        wxStrlcpy (buf, wxSafeConvertMB2WX(who->pw_name), sz);
         return true;
     }
 
@@ -889,7 +853,7 @@ bool wxGetUserName(wxChar *buf, int sz)
        char *comma = strchr(who->pw_gecos, ',');
        if (comma)
            *comma = '\0'; // cut off non-name comment fields
-       wxStrncpy (buf, wxSafeConvertMB2WX(who->pw_gecos), sz - 1);
+       wxStrlcpy(buf, wxSafeConvertMB2WX(who->pw_gecos), sz);
        return true;
     }
 
@@ -909,7 +873,7 @@ bool wxIsPlatform64Bit()
                 machine.Contains(wxT("alpha"));
 }
 
-// these functions are in mac/utils.cpp for wxMac
+// these functions are in src/osx/utilsexc_base.cpp for wxMac
 #ifndef __WXMAC__
 
 wxOperatingSystemId wxGetOsVersion(int *verMaj, int *verMin)
@@ -1225,22 +1189,6 @@ bool wxHandleFatalExceptions(bool doit)
 // wxExecute support
 // ----------------------------------------------------------------------------
 
-bool wxAppTraits::CreateEndProcessPipe(wxExecuteData& execData)
-{
-    return execData.pipeEndProcDetect.Create();
-}
-
-bool wxAppTraits::IsWriteFDOfEndProcessPipe(wxExecuteData& execData, int fd)
-{
-    return fd == (execData.pipeEndProcDetect)[wxPipe::Write];
-}
-
-void wxAppTraits::DetachWriteFDOfEndProcessPipe(wxExecuteData& execData)
-{
-    execData.pipeEndProcDetect.Detach(wxPipe::Write);
-    execData.pipeEndProcDetect.Close();
-}
-
 int wxAppTraits::AddProcessCallback(wxEndProcessData *data, int fd)
 {
     // define a custom handler processing only the closure of the descriptor
@@ -1248,47 +1196,11 @@ int wxAppTraits::AddProcessCallback(wxEndProcessData *data, int fd)
     {
         wxEndProcessFDIOHandler(wxEndProcessData *data, int fd)
             : m_data(data), m_fd(fd)
-        {}
+        {
+        }
 
         virtual void OnReadWaiting()
-            { wxFAIL_MSG("this isn't supposed to happen"); }
-        virtual void OnWriteWaiting()
-            { wxFAIL_MSG("this isn't supposed to happen"); }
-
-        virtual void OnExceptionWaiting()
         {
-            const int pid = m_data->pid > 0 ? m_data->pid : -(m_data->pid);
-            int status = 0;
-
-            // has the process really terminated?
-            int rc = waitpid(pid, &status, WNOHANG);
-            if ( rc == 0 )
-            {
-                // This can only happen if the child application closes our
-                // dummy pipe that is used to monitor its lifetime; in that
-                // case, our best bet is to pretend the process did terminate,
-                // because otherwise wxExecute() would hang indefinitely
-                // (OnExceptionWaiting() won't be called again, the descriptor
-                // is closed now).
-                wxLogDebug("Child process (PID %d) still alive, "
-                           "even though pipe was closed.", pid);
-            }
-            else if ( rc == -1 )
-            {
-                // As above, if waitpid() fails, the best we can do is to log the
-                // error and pretend the child terminated:
-                wxLogSysError(_("Failed to check child process' status"));
-            }
-
-            // set exit code to -1 if something bad happened
-            m_data->exitcode = rc > 0 && WIFEXITED(status) ? WEXITSTATUS(status)
-                                                           : -1;
-
-            wxLogTrace("exec",
-                       "Child process (PID %d) terminated with exit code %d",
-                       pid, m_data->exitcode);
-
-            // child exited, end waiting
             wxFDIODispatcher::Get()->UnregisterFD(m_fd);
             close(m_fd);
 
@@ -1297,6 +1209,9 @@ int wxAppTraits::AddProcessCallback(wxEndProcessData *data, int fd)
             delete this;
         }
 
+        virtual void OnWriteWaiting() { wxFAIL_MSG("unreachable"); }
+        virtual void OnExceptionWaiting() { wxFAIL_MSG("unreachable"); }
+
         wxEndProcessData * const m_data;
         const int m_fd;
     };
@@ -1305,185 +1220,228 @@ int wxAppTraits::AddProcessCallback(wxEndProcessData *data, int fd)
                              (
                                  fd,
                                  new wxEndProcessFDIOHandler(data, fd),
-                                 wxFDIO_EXCEPTION
+                                 wxFDIO_INPUT
                              );
     return fd; // unused, but return something unique for the tag
 }
 
-int wxAppTraits::WaitForChild(wxExecuteData& execData)
+bool wxAppTraits::CheckForRedirectedIO(wxExecuteData& execData)
 {
-    if ( execData.flags & wxEXEC_SYNC )
-    {
-        // just block waiting for the child to exit
-        int status = 0;
-
-        int result = waitpid(execData.pid, &status, 0);
-#ifdef __DARWIN__
-        /*  DE: waitpid manpage states that waitpid can fail with EINTR
-            if the call is interrupted by a caught signal.  I suppose
-            that means that this ought to be a while loop.
-
-            The odd thing is that it seems to fail EVERY time.  It fails
-            with a quickly exiting process (e.g. echo), and fails with a
-            slowly exiting process (e.g. sleep 2) but clearly after
-            having waited for the child to exit. Maybe it's a bug in
-            my particular version.
-
-            It works, however, from the CFSocket callback without this
-            trick but in that case it's used only after CFSocket calls
-            the callback and with the WNOHANG flag which would seem to
-            preclude it from being interrupted or at least make it much
-            less likely since it would not then be waiting.
-
-            If Darwin's man page is to be believed then this is definitely
-            necessary.  It's just weird that I've never seen it before
-            and apparently no one else has either or you'd think they'd
-            have reported it by now.  Perhaps blocking the GUI while
-            waiting for a child process to exit is simply not that common.
-         */
-        if ( result == -1 && errno == EINTR )
-        {
-            result = waitpid(execData.pid, &status, 0);
-        }
-#endif // __DARWIN__
+#if HAS_PIPE_INPUT_STREAM
+    bool hasIO = false;
 
-        if ( result == -1 )
-        {
-            wxLogLastError("waitpid");
-        }
-        else // child terminated
-        {
-            wxASSERT_MSG( result == execData.pid,
-                          "unexpected waitpid() return value" );
+    if ( execData.bufOut && execData.bufOut->Update() )
+        hasIO = true;
 
-            if ( WIFEXITED(status) )
-            {
-                return WEXITSTATUS(status);
-            }
-            else // abnormal termination?
-            {
-                wxASSERT_MSG( WIFSIGNALED(status),
-                              "unexpected child wait status" );
-            }
-        }
+    if ( execData.bufErr && execData.bufErr->Update() )
+        hasIO = true;
+
+    return hasIO;
+#else // !HAS_PIPE_INPUT_STREAM
+    return false;
+#endif // HAS_PIPE_INPUT_STREAM/!HAS_PIPE_INPUT_STREAM
+}
 
-        wxLogSysError(_("Waiting for subprocess termination failed"));
+// helper classes/functions used by WaitForChild()
+namespace
+{
 
-        return -1;
-    }
-    else // asynchronous execution
+// convenient base class for IO handlers which are registered for read
+// notifications only and which also stores the FD we're reading from
+//
+// the derived classes still have to implement OnReadWaiting()
+class wxReadFDIOHandler : public wxFDIOHandler
+{
+public:
+    wxReadFDIOHandler(wxFDIODispatcher& disp, int fd) : m_fd(fd)
     {
-        wxEndProcessData *endProcData = new wxEndProcessData;
-        endProcData->process  = execData.process;
-        endProcData->pid      = execData.pid;
-        endProcData->tag = AddProcessCallback
-                           (
-                             endProcData,
-                             execData.pipeEndProcDetect.Detach(wxPipe::Read)
-                           );
+        if ( fd )
+            disp.RegisterFD(fd, this, wxFDIO_INPUT);
+    }
 
-        execData.pipeEndProcDetect.Close();
-        return execData.pid;
+    virtual void OnWriteWaiting() { wxFAIL_MSG("unreachable"); }
+    virtual void OnExceptionWaiting() { wxFAIL_MSG("unreachable"); }
 
-    }
-}
+protected:
+    const int m_fd;
 
-void wxHandleProcessTermination(wxEndProcessData *proc_data)
+    wxDECLARE_NO_COPY_CLASS(wxReadFDIOHandler);
+};
+
+// class for monitoring our end of the process detection pipe, simply sets a
+// flag when input on the pipe (which must be due to EOF) is detected
+class wxEndHandler : public wxReadFDIOHandler
 {
-    // notify user about termination if required
-    if ( proc_data->process )
+public:
+    wxEndHandler(wxFDIODispatcher& disp, int fd)
+        : wxReadFDIOHandler(disp, fd)
     {
-        proc_data->process->OnTerminate(proc_data->pid, proc_data->exitcode);
+        m_terminated = false;
     }
 
-    // clean up
-    if ( proc_data->pid > 0 )
+    bool Terminated() const { return m_terminated; }
+
+    virtual void OnReadWaiting() { m_terminated = true; }
+
+private:
+    bool m_terminated;
+
+    wxDECLARE_NO_COPY_CLASS(wxEndHandler);
+};
+
+#if HAS_PIPE_INPUT_STREAM
+
+// class for monitoring our ends of child stdout/err, should be constructed
+// with the FD and stream from wxExecuteData and will do nothing if they're
+// invalid
+//
+// unlike wxEndHandler this class registers itself with the provided dispatcher
+class wxRedirectedIOHandler : public wxReadFDIOHandler
+{
+public:
+    wxRedirectedIOHandler(wxFDIODispatcher& disp,
+                          int fd,
+                          wxStreamTempInputBuffer *buf)
+        : wxReadFDIOHandler(disp, fd),
+          m_buf(buf)
     {
-        // async execution
-        delete proc_data;
     }
-    else // sync execution
+
+    virtual void OnReadWaiting()
     {
-        // let wxExecute() know that the process has terminated
-        proc_data->pid = 0;
+        m_buf->Update();
     }
-}
 
-#endif // wxUSE_BASE
+private:
+    wxStreamTempInputBuffer * const m_buf;
 
-#if wxUSE_GUI
+    wxDECLARE_NO_COPY_CLASS(wxRedirectedIOHandler);
+};
+
+#endif // HAS_PIPE_INPUT_STREAM
 
-int wxGUIAppTraits::WaitForChild(wxExecuteData& execData)
+// helper function which calls waitpid() and analyzes the result
+int DoWaitForChild(int pid, int flags = 0)
 {
-    const int flags = execData.flags;
-    if ( !(flags & wxEXEC_SYNC) || (flags & wxEXEC_NOEVENTS) )
+    wxASSERT_MSG( pid > 0, "invalid PID" );
+
+    int status, rc;
+
+    // loop while we're getting EINTR
+    for ( ;; )
     {
-        // async or blocking sync cases are already handled by the base class
-        // just fine, no need to duplicate its code here
-        return wxAppTraits::WaitForChild(execData);
+        rc = waitpid(pid, &status, flags);
+
+        if ( rc != -1 || errno != EINTR )
+            break;
     }
 
-    // here we're dealing with the case of synchronous execution when we want
-    // to process the GUI events while waiting for the child termination
+    if ( rc == 0 )
+    {
+        // This can only happen if the child application closes our dummy pipe
+        // that is used to monitor its lifetime; in that case, our best bet is
+        // to pretend the process did terminate, because otherwise wxExecute()
+        // would hang indefinitely (OnReadWaiting() won't be called again, the
+        // descriptor is closed now).
+        wxLogDebug("Child process (PID %d) still alive but pipe closed so "
+                   "generating a close notification", pid);
+    }
+    else if ( rc == -1 )
+    {
+        wxLogLastError(wxString::Format("waitpid(%d)", pid));
+    }
+    else // child did terminate
+    {
+        wxASSERT_MSG( rc == pid, "unexpected waitpid() return value" );
 
-    wxEndProcessData endProcData;
+        if ( WIFEXITED(status) )
+            return WEXITSTATUS(status);
+        else if ( WIFSIGNALED(status) )
+            return -WTERMSIG(status);
+        else
+        {
+            wxLogError("Child process (PID %d) exited for unknown reason, "
+                       "status = %d", pid, status);
+        }
+    }
 
-    // we may have process for capturing the program output, but it's
-    // not used in wxEndProcessData in the case of sync execution
-    endProcData.process = NULL;
+    return -1;
+}
 
-    // sync execution: indicate it by negating the pid
-    endProcData.pid = -execData.pid;
+} // anonymous namespace
 
-    endProcData.tag = AddProcessCallback
-                      (
-                         &endProcData,
-                         execData.pipeEndProcDetect.Detach(wxPipe::Read)
-                      );
+int wxAppTraits::WaitForChild(wxExecuteData& execData)
+{
+    if ( !(execData.flags & wxEXEC_SYNC) )
+    {
+        // asynchronous execution: just launch the process and return,
+        // endProcData will be destroyed when it terminates (currently we leak
+        // it if the process doesn't terminate before we do and this should be
+        // fixed but it's not a real leak so it's not really very high
+        // priority)
+        wxEndProcessData *endProcData = new wxEndProcessData;
+        endProcData->process = execData.process;
+        endProcData->pid = execData.pid;
+        endProcData->tag = AddProcessCallback
+                           (
+                             endProcData,
+                             execData.GetEndProcReadFD()
+                           );
+        endProcData->async = true;
 
-    execData.pipeEndProcDetect.Close();
+        return execData.pid;
+    }
+    //else: synchronous execution case
 
+#if HAS_PIPE_INPUT_STREAM
+    wxProcess * const process = execData.process;
+    if ( process && process->IsRedirected() )
+    {
+        // we can't simply block waiting for the child to terminate as we would
+        // dead lock if it writes more than the pipe buffer size (typically
+        // 4KB) bytes of output -- it would then block waiting for us to read
+        // the data while we'd block waiting for it to terminate
+        //
+        // so multiplex here waiting for any input from the child or closure of
+        // the pipe used to indicate its termination
+        wxSelectDispatcher disp;
 
-    // prepare to wait for the child termination: show to the user that we're
-    // busy and refuse all input unless explicitly told otherwise
-    wxBusyCursor bc;
-    wxWindowDisabler *wd = flags & wxEXEC_NODISABLE ? NULL
-                                                    : new wxWindowDisabler;
+        wxEndHandler endHandler(disp, execData.GetEndProcReadFD());
 
-    // endProcData.pid will be set to 0 from wxHandleProcessTermination() when
-    // the process terminates
-    while ( endProcData.pid != 0 )
-    {
-#if HAS_PIPE_INPUT_STREAM
-        bool idle = true;
+        wxRedirectedIOHandler outHandler(disp, execData.fdOut, execData.bufOut),
+                              errHandler(disp, execData.fdErr, execData.bufErr);
 
-        if ( execData.bufOut )
+        while ( !endHandler.Terminated() )
         {
-            execData.bufOut->Update();
-            idle = false;
+            disp.Dispatch();
         }
+    }
+    //else: no IO redirection, just block waiting for the child to exit
+#endif // HAS_PIPE_INPUT_STREAM
 
-        if ( execData.bufErr )
-        {
-            execData.bufErr->Update();
-            idle = false;
-        }
+    return DoWaitForChild(execData.pid);
+}
 
-        // don't consume 100% of the CPU while we're sitting in this
-        // loop
-        if ( idle )
-#endif // HAS_PIPE_INPUT_STREAM
-            wxMilliSleep(1);
+void wxHandleProcessTermination(wxEndProcessData *data)
+{
+    data->exitcode = DoWaitForChild(data->pid, WNOHANG);
 
-        // give the toolkit a chance to call wxHandleProcessTermination() here
-        // and also repaint the GUI and handle other accumulated events
-        wxYield();
+    // notify user about termination if required
+    if ( data->process )
+    {
+        data->process->OnTerminate(data->pid, data->exitcode);
     }
 
-    delete wd;
-
-    return endProcData.exitcode;
+    if ( data->async )
+    {
+        // in case of asynchronous execution we don't need this data any more
+        // after the child terminates
+        delete data;
+    }
+    else // sync execution
+    {
+        // let wxExecute() know that the process has terminated
+        data->pid = 0;
+    }
 }
 
-#endif //wxUSE_GUI
-