Mail Archives: cygwin/2005/03/04/12:13:44
On Fri, 4 Mar 2005, Igor Pechtchanski wrote:
> On Fri, 4 Mar 2005, Pat Kane wrote:
>
> > I am having problems using /dev/clipboard. When there is a text
> > selection on the Windows clipboard things work as expected, but if
> > there is some other type of selection I get: "Segmentation fault (core
> > dumped)"
> >
> > To duplicate the problem try: cat /dev/clipboard
> > first with a text selection and then after using Windows to copy a program
> > (right click, copy),
> > or after taking a screen snapshot (cntrl-alt-prntScrn).
> >
> > I am using Cygwin DLL 1.5.13-1 on Win2k V5 SP4,
>
> Ok, I can reproduce this on WinXP Pro SP1. The last few lines of strace
> before the exception[*] show a read call that executes normally, and then
> a SEGV. Someone with a debug version of Cygwin should be able to trace
> through this in gdb.
As I hit "Send", I realized that I have a (slightly older) debug version
of the DLL compiled from CVS, that also exhibits this problem. I don't
have time to delve into this now, but, just in case it helps, here's the
gdb trace:
(gdb) info threads
* 3 thread 9564.0x534 0x77f75a59 in ?? ()
from /cygdrive/c/WINDOWS/System32/ntdll.dll
2 thread 9564.0x2488 0x7ffe0304 in ?? ()
1 thread 9564.0x24fc 0x610b3df1 in strlen ()
at /usr/src/cygwin-cvs/src/winsup/cygwin/cygserver.h:82
Current language: auto; currently c++
(gdb) thread 1
[Switching to thread 1 (thread 9564.0x24fc)]#0 0x610b3df1 in strlen ()
at /usr/src/cygwin-cvs/src/winsup/cygwin/cygserver.h:82
82 ssize_t error_code () const { return _header.error_code; };
(gdb) where
#0 0x610b3df1 in strlen ()
at /usr/src/cygwin-cvs/src/winsup/cygwin/cygserver.h:82
#1 0x6101da6f in fhandler_dev_clipboard::read (this=0x61804d50,
ptr=0x100102d8, len=@0x77e75a90)
at /usr/src/cygwin-cvs/src/winsup/cygwin/fhandler_clipboard.cc:230
#2 0x0022ed8c in ?? ()
#3 0x77f5abb5 in ?? () from /cygdrive/c/WINDOWS/System32/ntdll.dll
#4 0x77e75a90 in KERNEL32!IsBadWritePtr ()
from /cygdrive/c/WINDOWS/system32/kernel32.dll
#5 0x00000400 in ?? ()
#6 0x0022ee60 in ?? ()
#7 0x00000001 in ?? ()
#8 0x10010000 in ?? ()
#9 0x00000000 in ?? () from
(gdb) list
77 size_t bufsiz = 0);
78 virtual ~client_request ();
79
80 request_code_t request_code () const { return _header.request_code; }
81
82 ssize_t error_code () const { return _header.error_code; };
83 void error_code (ssize_t error_code) { _header.error_code = error_code; };
84
85 size_t msglen () const { return _header.msglen; };
86 void msglen (size_t len) { _header.msglen = len; };
(gdb) up
#1 0x6101da6f in fhandler_dev_clipboard::read (this=0x61804d50,
ptr=0x100102d8, len=@0x77e75a90)
at /usr/src/cygwin-cvs/src/winsup/cygwin/fhandler_clipboard.cc:230
(gdb) list
230 ret = ((len > (strlen (lpstr) - pos)) ? (strlen (lpstr) - pos)
225 else
226 {
227 LPSTR lpstr;
228 lpstr = (LPSTR) GlobalLock (hglb);
229
230 ret = ((len > (strlen (lpstr) - pos)) ? (strlen (lpstr) - pos)
231 : len);
232
233 memcpy (ptr, lpstr + pos, ret);
234 //ret = snprintf((char *) ptr, len, "%s", lpstr);//+pos);
(gdb) quit
HTH,
Igor
--
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