src/osx/core/utilsexc_cf.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/osx/corefoundation/utilsexec_cf.cpp
   3 // Purpose:     Execution-related utilities for Darwin
   4 // Author:      David Elliott, Ryan Norton (wxMacExecute)
   5 // Modified by: Stefan Csomor (added necessary wxT for unicode builds)
   6 // Created:     2004-11-04
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) David Elliott, Ryan Norton
   9 // Licence:     wxWindows licence
  10 // Notes:       This code comes from src/osx/carbon/utilsexc.cpp,1.11
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 #include "wx/wxprec.h"
  14 #ifndef WX_PRECOMP
  15     #include "wx/log.h"
  16     #include "wx/utils.h"
  17 #endif //ndef WX_PRECOMP
  18 #include "wx/unix/execute.h"
  19 #include "wx/stdpaths.h"
  20 #include "wx/app.h"
  21 #include "wx/apptrait.h"
  22 #include "wx/thread.h"
  23 #include "wx/process.h"
  24
  25 #include <sys/wait.h>
  26
  27 #include <CoreFoundation/CFSocket.h>
  28
  29 /*!
  30     Called due to source signal detected by the CFRunLoop.
  31     This is nearly identical to the wxGTK equivalent.
  32  */
  33 extern "C" void WXCF_EndProcessDetector(CFSocketRef s,
  34                                         CFSocketCallBackType WXUNUSED(callbackType),
  35                                         CFDataRef WXUNUSED(address),
  36                                         void const *WXUNUSED(data),
  37                                         void *info)
  38 {
  39     /*
  40         Either our pipe was closed or the process ended successfully.  Either way,
  41         we're done.  It's not if waitpid is going to magically succeed when
  42         we get fired again.  CFSocketInvalidate closes the fd for us and also
  43         invalidates the run loop source for us which should cause it to
  44         release the CFSocket (thus causing it to be deallocated) and remove
  45         itself from the runloop which should release it and cause it to also
  46         be deallocated.  Of course, it's possible the RunLoop hangs onto
  47         one or both of them by retaining/releasing them within its stack
  48         frame.  However, that shouldn't be depended on.  Assume that s is
  49         deallocated due to the following call.
  50      */
  51     CFSocketInvalidate(s);
  52
  53     // Now tell wx that the process has ended.
  54     wxHandleProcessTermination(static_cast<wxEndProcessData *>(info));
  55 }
  56
  57 /*!
  58     Implements the GUI-specific AddProcessCallback() for both wxMac and
  59     wxCocoa using the CFSocket/CFRunLoop API which is available to both.
  60     Takes advantage of the fact that sockets on UNIX are just regular
  61     file descriptors and thus even a non-socket file descriptor can
  62     apparently be used with CFSocket so long as you only tell CFSocket
  63     to do things with it that would be valid for a non-socket fd.
  64  */
  65 int wxGUIAppTraits::AddProcessCallback(wxEndProcessData *proc_data, int fd)
  66 {
  67     static int s_last_tag = 0;
  68     CFSocketContext context =
  69     {   0
  70     ,   static_cast<void*>(proc_data)
  71     ,   NULL
  72     ,   NULL
  73     ,   NULL
  74     };
  75     CFSocketRef cfSocket = CFSocketCreateWithNative(kCFAllocatorDefault,fd,kCFSocketReadCallBack,&WXCF_EndProcessDetector,&context);
  76     if(cfSocket == NULL)
  77     {
  78         wxLogError(wxT("Failed to create socket for end process detection"));
  79         return 0;
  80     }
  81     CFRunLoopSourceRef runLoopSource = CFSocketCreateRunLoopSource(kCFAllocatorDefault, cfSocket, /*highest priority:*/0);
  82     if(runLoopSource == NULL)
  83     {
  84         wxLogError(wxT("Failed to create CFRunLoopSource from CFSocket for end process detection"));
  85         // closes the fd.. we can't really stop it, nor do we necessarily want to.
  86         CFSocketInvalidate(cfSocket);
  87         CFRelease(cfSocket);
  88         return 0;
  89     }
  90     // Now that the run loop source has the socket retained and we no longer
  91     // need to refer to it within this method, we can release it.
  92     CFRelease(cfSocket);
  93
  94     CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopCommonModes);
  95     // Now that the run loop has the source retained we can release it.
  96     CFRelease(runLoopSource);
  97
  98     /*
  99         Feed wx some bullshit.. we don't use it since CFSocket helpfully passes
 100         itself into our callback and that's enough to be able to
 101         CFSocketInvalidate it which is all we need to do to get everything we
 102         just created to be deallocated.
 103      */
 104     return ++s_last_tag;
 105 }
 106
 107 /////////////////////////////////////////////////////////////////////////////
 108
 109 // NOTE: This doesn't really belong here but this was a handy file to
 110 // put it in because it's already compiled for wxCocoa and wxMac GUI lib.
 111 #if wxUSE_STDPATHS
 112 static wxStandardPathsCF gs_stdPaths;
 113 wxStandardPaths& wxGUIAppTraits::GetStandardPaths()
 114 {
 115     return gs_stdPaths;
 116 }
 117 #endif
 118