Re: Cannot run Qt5 applications.
On 05/02/2015 01:40, Jon TURNEY wrote:
On 04/02/2015 23:20, David Stacey wrote:
I'm having difficulty running any Qt5 application. These are the
commands I'm issuing:
XWin -multiwindow &
export DISPLAY=:0.0
xclock &
and I see the clock, so X is up and running. Then:
/usr/lib/qt5/examples/gui/analogclock/analogclock
QXcbConnection: XCB error: 145 (Unknown), sequence: 162, resource
id: 0, major c
ode: 140 (Unknown), minor code: 20
Bad system call (core dumped)
Possibly you need to install and start cygserver (See [1])
If so, this is because Qt5 is assuming shared memory is available, which
could possibly be handled in a better way...
[1] http://x.cygwin.com/docs/ug/using-shared-memory.html
Yaakov,
This looks like a portability problem in Qt5, where it only handles
shmget() failing with a return value of -1, not with SIGSYS, to fallback
to using an image in unshared memory.
Patch attached.
--
Jon TURNEY
Volunteer Cygwin/X X Server maintainer
---
origsrc/qtbase-opensource-src-5.3.2/src/plugins/platforms/xcb/qxcbbackingstore.cpp
2014-09-11 11:48:06.0 +0100
+++
src/qtbase-opensource-src-5.3.2/src/plugins/platforms/xcb/qxcbbackingstore.cpp
2015-02-13 17:30:11.410525500 +
@@ -75,6 +75,7 @@ public:
private:
void destroy();
+static bool isShmSupported();
xcb_shm_segment_info_t m_shm_info;
@@ -88,6 +89,44 @@ private:
QRegion m_dirty;
};
+static bool shmNotSupported = false;
+
+static void
+SigSysHandler(int signo)
+{
+shmNotSupported = true;
+}
+
+bool
+QXcbShmImage::isShmSupported()
+{
+static bool checked = false;
+if (!checked)
+ {
+void (*oldHandler)(int);
+int shmid = -1;
+
+/* If no SHM support in the kernel, the bad syscall will generate
SIGSYS */
+oldHandler = signal(SIGSYS, SigSysHandler);
+
+shmNotSupported = false;
+shmid = shmget(IPC_PRIVATE, 4096, IPC_CREAT);
+if (shmid != -1)
+ {
+/* Successful allocation - clean up */
+shmctl(shmid, IPC_RMID, NULL);
+ }
+else
+ {
+/* Allocation failed */
+shmNotSupported = true;
+ }
+signal(SIGSYS, oldHandler);
+checked = true;
+ }
+return (!shmNotSupported);
+}
+
QXcbShmImage::QXcbShmImage(QXcbScreen *screen, const QSize &size, uint depth,
QImage::Format format)
: QXcbObject(screen->connection())
, m_gc(0)
@@ -116,7 +155,9 @@ QXcbShmImage::QXcbShmImage(QXcbScreen *s
if (!segmentSize)
return;
-int id = shmget(IPC_PRIVATE, segmentSize, IPC_CREAT | 0600);
+int id = -1;
+if (isShmSupported())
+ id = shmget(IPC_PRIVATE, segmentSize, IPC_CREAT | 0600);
if (id == -1)
qWarning("QXcbShmImage: shmget() failed (%d) for size %d (%dx%d)",
errno, segmentSize, size.width(), size.height());
@@ -130,7 +171,7 @@ QXcbShmImage::QXcbShmImage(QXcbScreen *s
xcb_generic_error_t *error = NULL;
if (shm_present)
error = xcb_request_check(xcb_connection(),
xcb_shm_attach_checked(xcb_connection(), m_shm_info.shmseg, m_shm_info.shmid,
false));
-if (!shm_present || error) {
+if (!shm_present || error || (id == -1)) {
free(error);
shmdt(m_shm_info.shmaddr);
--
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===
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==
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* NEW piecewise functions via separate sampling ranges for each plot element
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Re: Cygwin/X XDMCP Issue
On 13/02/2015 07:24, Maarten Hoes wrote: > On 2-2-2015 16:20, Jon TURNEY wrote: > If you can provide the details of the linux distribution and release > you are using on your remote host, I can see if I can try to > reproduce the problem. I was wondering if you managed to reproduce the issue ? Yes, I can reproduce it. It seems that the XRANDR data which XWin returns isn't quite complete, which tickles a bug in Gnome [1] "primaryMonitor is undefined", which prevents the login greeter from being displayed. I've been testing a fix for that issue in XWin. This gets you the greeter login screen. Unfortunately there seem to be other bugs, which prevent login from working. These also occur when starting an XDMCP session from linux, so I don't think these are XWin issues. [1] https://bugzilla.gnome.org/show_bug.cgi?id=736054 -- Jon TURNEY Volunteer Cygwin/X X Server maintainer -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://x.cygwin.com/docs/ FAQ: http://x.cygwin.com/docs/faq/
