Redirecting Standard Input

Redirecting Standard Input

[Scott A. Hill]

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I have a small Fortran project that reads 
a data file from standard input in order to obtain required 
paramaters.  Normally, the code is executed with the following 
command
 
    ./multivar < 
multivar.inf
 
During debugging sessions on my NT 4.0 box 
(using GDB 5.0 & cygwin 1.1.7), GDB  or bash is not redirecting 
the input file to standard input.  However, on my Win98 machine at 
home, the debugging session runs as anticipated.  The command I use to 
initiate the debugging session on either machine is 
 
    gdb ./multivar < 
multivar.inf
 
Now for my question.  Am I doing something 
wrong on the NT box or is NT doing something that won't allow the 
redirection?  I did a search on the mail list archives but couldn't 
find anything.  I'd appreciate any information.  Also, please respond 
back to me since I'm not a member of this list.  Thanks
 
 
Scott  
 
 

Re: Redirecting Standard Input

[Fernando Nasser]

Scott, please send your messages as plain text.  Not all e-mail
readers can handle HTML.

> "Scott A. Hill" wrote:
> 
> I have a small Fortran project that reads a data file from standard input in order to obtain required paramaters.  Normally, the code is executed with the following command
> 
>     ./multivar < multivar.inf
> 
> During debugging sessions on my NT 4.0 box (using GDB 5.0 & cygwin 1.1.7), GDB  or bash is not redirecting the input file to standard input.  However, on my Win98 machine at home, the debugging session runs as anticipated.  The command I use to initiate the debugging session on either machine is
> 
>     gdb ./multivar < multivar.inf
> 
> Now for my question.  Am I doing something wrong on the NT box or is NT doing something that won't allow the redirection?  I did a search on the mail list archives but couldn't find anything.  I'd appreciate any information.  Also, please respond back to me since I'm not a member of this list.  Thanks
> 

Maybe you should post to the Cygwin list.  You can find the list address at:

        http://sources.redhat.com/cygwin/


However, can't you avoid this problem by reading your data from a separate
file instead of standard input?  You can even do that while you are
debuging only.

-- 
Fernando Nasser
Red Hat - Toronto                       E-Mail:  fnasser@redhat.com
2323 Yonge Street, Suite #300
Toronto, Ontario   M4P 2C9

Re: Redirecting Standard Input

[Tom Tromey]

>>>>> "Scott" == Scott A Hill <s.a.hill@larc.nasa.gov> writes:

Scott> The command I use to initiate the debugging session on
Scott> either machine is

Scott>     gdb ./multivar < multivar.inf

This is wrong.

Instead invoke `gdb ./multivar', and then in gdb use `r < multivar.inf'.
Or use `set args < multivar.inf' and then plain `r'.

It would be nice if gdb could work the way you want -- I've wanted
that (plus some additional features to make it very useful) for years.
However, it doesn't work that way.

Tom

Re: Redirecting Standard Input

[Scott A. Hill]

Thanks for the help Tom, Fernando, and Nicholas, but your suggestions didn't
work.  For clarification, I'm using
the Insight GUI on top of gdb.  But after your suggestions I tried using the
setargs option in the basic gdb
debugger.  No dice.  I have also used the option in the Insight GUI to no
avail also.  I realize that I could change
the code during debugging so that the file it's reading from is hard coded
(and I have in the past, but now I'm just
being lazy), but I was wondering why it worked in Win98 but not in NT.  As
in the first e-mail, with Win98 I can
type the following command

    gdb ./multivar.exe < ./multivar.inf

and the Insight GDB debugger pops up and I can step all the way through the
code.  If this is more probably a
cygwin/bash issue, then I'll pop a questions over to the guys on the cygwin
list.  Again, thanks for the quick replies
and help.


Scott