Blame 0001-tdf-95843-Wait-for-fire_glxtest_process-also-in-head.patch

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From 1b3cf7e967aa103181a3203f5d504d49b49a5ab2 Mon Sep 17 00:00:00 2001
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From: Stephan Bergmann <sbergman@redhat.com>
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Date: Thu, 19 Apr 2018 13:59:16 +0200
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Subject: [PATCH] tdf#95843: Wait for fire_glxtest_process also in --headless
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 mode
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Discussed with mmeeks on IRC that fire_glxtest_process is probably called as
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early as possible so that its reuslt is ready by the time it is needed in the
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non-headless case.  So best fix for headless is probably to just wait for the
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sub-process at an opportune point, instead of redesigning the whole mess so that
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fire_glxtest_process would only be called once its result is actually needed.
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Change-Id: I4ea9c9d54b83c9695a3b72317e68fed0c410da0e
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Reviewed-on: https://gerrit.libreoffice.org/53154
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Tested-by: Jenkins <ci@libreoffice.org>
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Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
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(cherry picked from commit 4bacf58f4af44ac8c4632b43289ccfcc07e5820c)
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---
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 desktop/inc/app.hxx                |  1 +
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 desktop/source/app/app.cxx         |  9 +++++++++
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 desktop/source/app/sofficemain.cxx |  4 ++++
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 vcl/inc/opengl/x11/glxtest.hxx     |  2 ++
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 vcl/unx/glxtest.cxx                | 16 ++++++++++++++++
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 5 files changed, 32 insertions(+)
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diff --git a/desktop/inc/app.hxx b/desktop/inc/app.hxx
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index 0e5f8774d3c3..d0ef2a66818a 100644
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--- a/desktop/inc/app.hxx
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+++ b/desktop/inc/app.hxx
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@@ -181,6 +181,7 @@ OUString ReplaceStringHookProc(const OUString& rStr);
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 #if defined( UNX ) && !defined MACOSX && !defined IOS && !defined ANDROID && !defined LIBO_HEADLESS
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 bool fire_glxtest_process();
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+void reap_glxtest_process();
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 #endif
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 #endif // INCLUDED_DESKTOP_INC_APP_HXX
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diff --git a/desktop/source/app/app.cxx b/desktop/source/app/app.cxx
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index 192793ea42f1..583ea189165f 100644
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--- a/desktop/source/app/app.cxx
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+++ b/desktop/source/app/app.cxx
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@@ -1595,6 +1595,15 @@ int Desktop::Main()
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         CheckOpenCLCompute(xDesktop);
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 #endif
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+        // In headless mode, reap the process started by fire_glxtest_process() early in soffice_main
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+        // (desktop/source/app/sofficemain.cxx), in a code block that needs to be covered by the same
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+        // #if condition as this code block:
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+#if defined( UNX ) && !defined MACOSX && !defined IOS && !defined ANDROID && !defined(LIBO_HEADLESS) && HAVE_FEATURE_OPENGL
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+        if (rCmdLineArgs.IsHeadless()) {
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+            reap_glxtest_process();
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+        }
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+#endif
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+
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         // Release solar mutex just before we wait for our client to connect
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         {
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             SolarMutexReleaser aReleaser;
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diff --git a/desktop/source/app/sofficemain.cxx b/desktop/source/app/sofficemain.cxx
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index 657614962489..67c1efe4a799 100644
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--- a/desktop/source/app/sofficemain.cxx
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+++ b/desktop/source/app/sofficemain.cxx
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@@ -122,6 +122,10 @@ extern "C" int DESKTOP_DLLPUBLIC soffice_main()
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 #if defined( UNX ) && !defined MACOSX && !defined IOS && !defined ANDROID && !defined(LIBO_HEADLESS) && HAVE_FEATURE_OPENGL
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     /* Run test for OpenGL support in own process to avoid crash with broken
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      * OpenGL drivers. Start process as early as possible.
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+     * In non-headless mode, the process will be reaped in X11OpenGLDeviceInfo::GetData
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+     * (vcl/opengl/x11/X11DeviceInfo.cxx).  In headless mode, the process will be reaped late in
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+     * Desktop::Main (desktop/source/app/app.cxx), in a code block that needs to be covered by the
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+     * same #if condition as this code block.
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      */
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     bool bSuccess = fire_glxtest_process();
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     SAL_WARN_IF(!bSuccess, "desktop.opengl", "problems with glxtest");
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diff --git a/vcl/inc/opengl/x11/glxtest.hxx b/vcl/inc/opengl/x11/glxtest.hxx
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index 979f795de139..d74436aae111 100644
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--- a/vcl/inc/opengl/x11/glxtest.hxx
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+++ b/vcl/inc/opengl/x11/glxtest.hxx
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@@ -18,6 +18,8 @@ VCL_DLLPUBLIC pid_t* getGlxPid();
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 bool fire_glxtest_process();
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+void reap_glxtest_process();
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+
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 #endif
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 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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diff --git a/vcl/unx/glxtest.cxx b/vcl/unx/glxtest.cxx
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index b0cdde234c2b..70d34fb7318d 100644
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--- a/vcl/unx/glxtest.cxx
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+++ b/vcl/unx/glxtest.cxx
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@@ -27,6 +27,8 @@
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 #include <string.h>
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 #include <signal.h>
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+#include <sys/wait.h>
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+
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 #include <opengl/x11/glxtest.hxx>
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 #ifdef __SUNPRO_CC
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@@ -36,6 +38,8 @@
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 #include <X11/Xlib.h>
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 #include <X11/Xutil.h>
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+#include <sal/log.hxx>
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+
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 // stuff from glx.h
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 typedef struct __GLXcontextRec *GLXContext;
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 typedef XID GLXPixmap;
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@@ -275,3 +279,15 @@ bool fire_glxtest_process()
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   *glxtest_pid = pid;
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   return true;
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 }
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+
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+void reap_glxtest_process() {
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+    pid_t * pid = getGlxPid();
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+    if (*pid != 0) {
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+        // Use WNOHANG, as it is probably better to have a (rather harmless) zombie child process
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+        // hanging around for the duration of the calling process, than to potentially block the
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+        // calling process here:
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+        pid_t e = waitpid(*pid, nullptr, WNOHANG);
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+        SAL_INFO_IF(
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+            e <= 0, "vcl.opengl", "waiting for glxtest process " << *pid << " failed with " << e);
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+    }
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+}
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-- 
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2.14.3
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