On 05/03/2011 05:19 AM, peng zhang wrote: > Hi, folks, > > I have a simple app which emulate multitouch events by send continous MT > event to /dev/input/eventX (that file related with real touch device.), > but after a while, that would lead to the X crash. > Even I already reduce the frequency to 3 times per second, or even one > per second, those events sent to /dev/input/eventX as below (send the > whole sequence 3/s or 1/s and wait for several mins): > > /* emulate finger 1*/ > event.type = EV_ABS; > event.code = ABS_MT_TRACKING_ID; > event.value = 1; > write(fd, &event, sizeof(struct input_event)); > > event.type = EV_ABS; > event.code = ABS_MT_POSITION_X; > event.value = 1000; > write(fd, &event, sizeof(struct input_event)); > > event.type = EV_ABS; > event.code = ABS_MT_POSITION_Y; > event.value = 1000; > write(fd, &event, sizeof(struct input_event)); > > event.type = EV_SYN; > event.code = SYN_MT_REPORT; > event.value = 0; > write(fd, &event, sizeof(struct input_event)); > > /* emulate finger 2*/ > ... > > event.type = EV_SYN; > event.code = SYN_REPORT; > event.value = 0; > write(fd, &event, sizeof(struct input_event)); > > I can read back those events from the /dev/input/eventX by evtest. > > After several mins (at most 15 mins), the X crash with many info in log > like: > [ 3967.109] (EE) libmtdev sent SYN_MT_REPORT(EE) libmtdev sent > SYN_MT_REPORT(EE) > (many many "(EE) libmtdev sent SYN_MT_REPORT"). > > Some backtrace like: > Fatal server error: > [ 4054.156] Wrong event type 0. > and > [ 4054.194] 0: /usr/bin/Xorg (xorg_backtrace+0x3c) [0x809c4cc] > [ 4054.194] 1: /usr/bin/Xorg (0x8047000+0x64396) [0x80ab396] > [ 4054.195] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb777640c] > [ 4054.195] 3: /usr/lib/libmtdev.so.1 (mtdev_empty+0xd) [0xb5cacc0d] > [ 4054.195] 4: /usr/lib/libmtdev.so.1 (mtdev_get+0x63) [0xb5cacce3] > > > But interface with touchpanel with real fingers doesn't lead to this issue. > Anything wrong with above emulation steps?
I've not heard of any crashes like this in real world usage, but your methods seem reasonable. I would suggest filing a bug on launchpad.net: https://bugs.launchpad.net/mtdev/+filebug Thanks! -- Chase _______________________________________________ Mailing list: https://launchpad.net/~multi-touch-dev Post to : multi-touch-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~multi-touch-dev More help : https://help.launchpad.net/ListHelp
