Don't share the wakeup pipe with child processes

Create a new pipe in the child process.

In a normal desktop LibreOffice each fork() will be followed quickly
by an exec(), so the FD_CLOEXEC would be enough for that. In
LibreOfficeKit-based software that uses the preinit mechanism, though,
the intent is that one can fork child processes without exec().

This solution uses pthread_atfork(). Another way would be to add
suitable public API callable from the LibreOfficeKit client
initialisation code in desktop/source/lib/init.cxx to explicitly close
and reopen the wakeup pipe in the default SvpSalInstance.

Reviewed-on: https://gerrit.libreoffice.org/24256
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>
(cherry picked from commit 57295468a6770d7831437d83248e68bbe667d86b)

Change-Id: I03fad4ce4adf14c16cb0f537b3baab58fba38922

1 files changed, 8 insertions, 1 deletions

diff --git a/vcl/inc/headless/svpinst.hxx b/vcl/inc/headless/svpinst.hxx
index 2d2716eb1d4f..a633cc3d3e57 100644
--- a/vcl/inc/headless/svpinst.hxx
+++ b/vcl/inc/headless/svpinst.hxx
@@ -30,6 +30,7 @@
 #include <basebmp/scanlineformats.hxx>
 
 #include <list>
+#include <map>
 
 #include <time.h>
 
@@ -87,13 +88,19 @@ class VCL_DLLPUBLIC SvpSalInstance : public SalGenericInstance
 
     void                    DoReleaseYield( int nTimeoutMS );
 
+    typedef std::map< sal_uInt16, ::basebmp::Format > BitCountFormatMap;
+    BitCountFormatMap m_aBitCountFormatMap;
+
 public:
     static SvpSalInstance*  s_pDefaultInstance;
 
     SvpSalInstance( SalYieldMutex *pMutex );
     virtual ~SvpSalInstance();
 
-    void                    PostEvent(const SalFrame* pFrame, ImplSVEvent* pData, sal_uInt16 nEvent);
+    void                    CloseWakeupPipe();
+    void                    CreateWakeupPipe();
+
+    void                    PostEvent(const SalFrame* pFrame, ImplSVEvent* pData, sal_uInt16 nEvent );
 
 #ifdef ANDROID
     bool                    PostedEventsInQueue();