+#endif // !Darwin/Darwin
+
+int wxGUIAppTraits::WaitForChild(wxExecuteData& execData)
+{
+ wxEndProcessData *endProcData = new wxEndProcessData;
+
+ const int flags = execData.flags;
+
+ // wxAddProcessCallback is now (with DARWIN) allowed to call the
+ // callback function directly if the process terminates before
+ // the callback can be added to the run loop. Set up the endProcData.
+ if ( flags & wxEXEC_SYNC )
+ {
+ // 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;
+
+ // sync execution: indicate it by negating the pid
+ endProcData->pid = -execData.pid;
+ }
+ else
+ {
+ // async execution, nothing special to do -- caller will be
+ // notified about the process termination if process != NULL, endProcData
+ // will be deleted in GTK_EndProcessDetector
+ endProcData->process = execData.process;
+ endProcData->pid = execData.pid;
+ }
+
+
+ if ( !(flags & wxEXEC_NOEVENTS) )
+ {
+#if USE_OLD_DARWIN_END_PROCESS_DETECT
+ endProcData->tag = wxAddProcessCallbackForPid(endProcData, execData.pid);
+#else
+ endProcData->tag = wxAddProcessCallback
+ (
+ endProcData,
+ execData.pipeEndProcDetect.Detach(wxPipe::Read)
+ );
+
+ execData.pipeEndProcDetect.Close();
+#endif // USE_OLD_DARWIN_END_PROCESS_DETECT
+ }
+
+ if ( flags & wxEXEC_SYNC )
+ {
+ wxBusyCursor bc;
+ int exitcode = 0;
+
+ wxWindowDisabler *wd = flags & (wxEXEC_NODISABLE | wxEXEC_NOEVENTS)
+ ? NULL
+ : new wxWindowDisabler;
+
+ if ( flags & wxEXEC_NOEVENTS )
+ {
+ // 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
+
+ if ( result == -1 )
+ {
+ wxLogLastError(_T("waitpid"));
+ exitcode = -1;
+ }
+ else
+ {
+ wxASSERT_MSG( result == execData.pid,
+ _T("unexpected waitpid() return value") );
+
+ if ( WIFEXITED(status) )
+ {
+ exitcode = WEXITSTATUS(status);
+ }
+ else // abnormal termination?
+ {
+ wxASSERT_MSG( WIFSIGNALED(status),
+ _T("unexpected child wait status") );
+ exitcode = -1;
+ }
+ }
+ }
+ else // !wxEXEC_NOEVENTS
+ {
+ // endProcData->pid will be set to 0 from
+ // wxHandleProcessTermination when the process terminates
+ while ( endProcData->pid != 0 )
+ {
+ bool idle = true;
+
+#if HAS_PIPE_INPUT_STREAM
+ if ( execData.bufOut )
+ {
+ execData.bufOut->Update();
+ idle = false;
+ }
+
+ if ( execData.bufErr )
+ {
+ execData.bufErr->Update();
+ idle = false;
+ }
+#endif // HAS_PIPE_INPUT_STREAM
+
+ // don't consume 100% of the CPU while we're sitting in this
+ // loop
+ if ( idle )
+ wxMilliSleep(1);
+
+ // give GTK+ a chance to call GTK_EndProcessDetector here and
+ // also repaint the GUI
+ wxYield();
+ }
+
+ exitcode = endProcData->exitcode;
+ }
+
+ delete wd;
+ delete endProcData;
+
+ return exitcode;
+ }
+ else // async execution
+ {
+ return execData.pid;
+ }
+}
+
+#ifdef wxHAS_GENERIC_PROCESS_CALLBACK
+struct wxEndProcessFDIOHandler : public wxFDIOHandler
+{
+ 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()
+ {
+ 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 %i) still alive, even though notification was received that it terminated.", 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 %i) terminated with exit code %i",
+ pid, m_data->exitcode);
+
+ // child exited, end waiting
+ wxFDIODispatcher::Get()->UnregisterFD(m_fd);
+ close(m_fd);
+
+ m_data->fdioHandler = NULL;
+ wxHandleProcessTermination(m_data);
+
+ delete this;
+ }
+
+ wxEndProcessData *m_data;
+ int m_fd;
+};
+
+int wxAddProcessCallback(wxEndProcessData *proc_data, int fd)
+{
+ proc_data->fdioHandler = new wxEndProcessFDIOHandler(proc_data, fd);
+ wxFDIODispatcher::Get()->RegisterFD
+ (
+ fd,
+ proc_data->fdioHandler,
+ wxFDIO_EXCEPTION
+ );
+ return fd; // unused, but return something unique for the tag
+}
+#endif // wxHAS_GENERIC_PROCESS_CALLBACK
+
+#endif // wxUSE_GUI
+#if wxUSE_BASE
+
+void wxHandleProcessTermination(wxEndProcessData *proc_data)
+{
+ // notify user about termination if required
+ if ( proc_data->process )
+ {
+ proc_data->process->OnTerminate(proc_data->pid, proc_data->exitcode);
+ }
+
+ // clean up
+ if ( proc_data->pid > 0 )
+ {
+ delete proc_data;
+ }
+ else
+ {
+ // let wxExecute() know that the process has terminated
+ proc_data->pid = 0;
+ }
+}
projects / wxWidgets.git / blobdiff