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List: linux-arm-kernel
Subject: RE: Segfault when reading event device.
From: "Robertson, Ezban" <ezban.robertson () homeauto ! com>
Date: 2005-06-29 18:53:50
Message-ID: ED3CB89794C8C9469511DFC53A8C737030C8BF () sbs2003 ! HAI ! local
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I believed I've solved part of the problem, however I'm getting quite a
few of these messages:
[tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]
I suspect it'll come back to bite me later if go unnoticed. Does anyone
have any ideas what could cause this?
Thanks.
> -----Original Message-----
> From: Marc Singer [mailto:elf@buici.com]
> Sent: Tuesday, June 28, 2005 4:14 PM
> To: Robertson, Ezban
> Cc: linux-arm-kernel@lists.arm.linux.org.uk
> Subject: Re: Segfault when reading event device.
>
> On Tue, Jun 28, 2005 at 02:59:02PM -0500, Robertson, Ezban wrote:
> > Although the values of ts_read below looks good to me, one
> things that
> > bothers me is ts->list argument (First arg in ts_read). I
> realize this
> > package doesn't have much docs but maybe someone can
> indicate it that
> > looks ok or not.
> >
> >
[tcsetpgrp failed in terminal_inferior: Inappropriate ioctl
> > for device] [tcsetpgrp failed in terminal_inferior: Inappropriate
> > ioctl for device] [tcsetpgrp failed in terminal_inferior:
> > Inappropriate ioctl for device] lh7a40x_clcd_mmap
> > createfont: (height == 0) found builtin font System (0)
> > PD_OPEN: TS DEVICE: /dev/input/event0: fd: 8
> > createfont: (height == 0) found builtin font System (0)
> > PD_Read:
> > Program received signal SIGSEGV, Segmentation fault.
> > 0x4002263c in ts_read (ts=0x0, samp=0xbefffb88, nr=1) at
> ts_read.c:38
> > 38 ts_read.c: No such file or directory.
>
> This is the interesting part, but without a source listing
> we're still blind.
>
> If the code is dereferencing ts and ts is NULL, look to see
> why ts is zero.
>
> > in ts_read.c
> > (gdb) bt
> > #0 0x4002263c in ts_read (ts=0x0, samp=0xbefffb88, nr=0) at
> > ts_read.c:38
> > #1 0x00025794 in PD_Read (px=0xbefffc04, py=0xbefffc00,
> pz=0xbefffbfc,
> > pb=0xbefffbf8, mode=283428)
> > at /touchscreen/packages/mwx91/src/drivers/mou_touch
> > screen.c:97
> > #2 0x0000efc4 in GdReadMouse (px=0xbefffc34, py=0xbefffc30,
> > pb=0xbefffc2c)
> > at /touchscreen/packages/mwx91/src/engine/devmouse.c
> > :241
> > #3 0x0002c4dc in GsCheckMouseEvent ()
> > at /touchscreen/packages/mwx91/src/mwx/srvevent.c:
> > 168
> > #4 0x00025fcc in GsSelect (timeout=0)
> > at /touchscreen/packages/mwx91/src/mwx/srvmain.c:5
> > 71
> > #5 0x0002591c in main (argc=1, argv=0xbefffd44)
> > at /touchscreen/packages/mwx91/src/mwx/srvmain.c:2
> > 06
> >
> >
> >
> > > -----Original Message-----
> > > From: Marc Singer [mailto:elf@buici.com]
> > > Sent: Tuesday, June 28, 2005 12:43 PM
> > > To: Robertson, Ezban
> > > Cc: linux-arm-kernel@lists.arm.linux.org.uk
> > > Subject: Re: Segfault when reading event device.
> > >
> > > On Tue, Jun 28, 2005 at 10:59:12AM -0500, Robertson, Ezban wrote:
> > > > I've ran into a problem while reading the event device
> 0 (a touch
> > > > panel device). The driver is working after being able
> to execute
> > > > ts_calibrate, but executing the code fragment below from an
> > > app causes
> > > > a seg fault and I not sure why.
> > > > Maybe someone can identify what's possibly wrong.
> > > >
> > > >
> > > > struct ts_event event;
> > > >
> > > > /* read a data point */
> > > >
> > > > ret = ts_read(ts,&event,1);
> > > > if(ret < 0 ) {
> > > > EPRINTF("[%s] Error %d reading from touch
> > > > panel\n", TS_DEVICE, errno);
> > > > return -1;
> > > > }
> > > >
> > > > Where ts_event is
> > > > {
> > > > int x;
> > > > int y;
> > > > unsigned int pressure;
> > > > struct timeval timestamp;
> > > > }
> > > >
> > > > ts_read in the source is doing a
> ts->list->ops->read(ts->list,
> > > > samp, nr);
> > >
> > > There isn't enough code here to see what is going on. Have you
> > > tried loading the program into GDB and letting it show
> you where the
> > > segfault is occurring.?
> > >
> > > >
> > > > Msg log:
> > > >
> > > > #
> > > > createfont: (height == 0) found builtin font System (0)
> > > > PD_OPEN: TS DEVICE: /dev/input/event0: fd: 5
> > > > createfont: (height == 0) found builtin font System (0)
> > > > CLCD: SINGLE PANEL
> > > > CLCD: LCD is in Color STN Interface
> > > > CLCD: 16 BPP mode
> > > > CLCD: disabling LCD
> > > > CLCD: enabling LCD
> > > > CLCD: Registers set to
> > > > TIM0: 0505054c TIM1: 000000ef TIM2: 007707d7 TIM3: 00000000
> > > > UBAS: c1c00000 LBAS: c1c12c00 IENB: 00000000 CNTL:
> > > 00010909 PD_Read
> > > > signal 11 caught
> > > >
> > > >
> ------------------------------------------------------------------
> > > > -
> > > > List admin:
> > > http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm-kernel
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> > >
>
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