Re: insight debugger locks up

[Keith Seitz <keiths at redhat dot com>]

On Fri, 2003-11-14 at 12:44, y2bismil@engmail.uwaterloo.ca wrote:
> Weird.  It appears it is a kbhit problem.  For some reason even on that line way
> up top, if I just press a key on the console screen from the debugger, the
> program continues.  But stepping through appears to be messed up.  I have to put
> breakpoints everywhere.
> 
> Is there some incompatibility with stepping through code and kbhit.
> 
> Yamin

I've never used mingw, so I cannot comment on how well gdb works with it
-- especially when using windows system calls.

> Quoting y2bismil@engmail.uwaterloo.ca:
> > Hi all,
> > 
> > i'm using the insight debugger from the lastest cygwin package.  It seems to
> > be
> > locking up when trying to step through code.  The following program isolates
> > the
> > issue on my system
> > 
> > ******************************************************
> > #include <io.h>
> > #include <stdio.h>
> > #include  <fcntl.h>
> > #include <sys/stat.h>
> > #include <conio.h>
> > 
> > int main()
> > {
> >    int handle;
> >    handle= creat("hello.txt", 0);
> >    if (handle == -1)
> >    {
> >       printf("Unable to creat file hello.txt\r\n");
> >    }
> > 
> >    write(handle, "Hello\r\n",7);
> >    close(handle);
> > 
> >    handle= open("hello.txt", O_RDWR|O_BINARY, S_IREAD | S_IWRITE);
> >    if (handle == -1)
> >    {
> >       printf("Unable to open file hello.txt\r\n");
> >    }
> >    write(handle, "urdum\r\n",7);
> >    close(handle);
> > 
> >   while(1)
> >  {
> > 	char c = kbhit();
> >        if(c)
> >        {
> >             c = getch();
> >             char buffer[12];
> >             buffer[0] = c;
> >             buffer[1] = '\0';
> >             printf(buffer);
> >             break;
> >        }
> >         
> >  }
> > }
> > 
> > 
> > Compile line:
> > 
> > g++ -g -mno-cygwin -isystemC:/cygwin/usr/include/mingw -o main.exe  main.cpp
> > ******************************************************
> > What I do:
> > Start the insight debugger.  Use Next (not even step into).  Stepping over
> > this
> > line:  handle= creat("hello.txt", 0); causes a lockup of insight.  Yet, I
> > get
> > the printfs:
> > 
> > printf("Unable to creat file hello.txt\r\n");
> > printf("Unable to open file hello.txt\r\n").
> > 
> > My problem first arose after trying out kbhit, which locks up.  Then I went
> > to
> > my little file test program and it has the same problem.
> > Any ideas?

Offhand, it sounds like the debug info is messed up (or gdb is messed up
trying to use that information). Have you tried running just vanilla
gdb? ("insight -nw" or just "gdb")

My suspicion is that since your program is not using cygwin, the console
stuff is all messed up. Consequently, you're having to type into the
console that started insight (or something like that).

Keith