isatty bug

Igor Pechtchanski pechtcha@cs.nyu.edu
Tue Sep 16 17:37:00 GMT 2003


On Tue, 16 Sep 2003, Sam Steingold wrote:

> > * Christopher Faylor <pts-epz@pltjva.pbz> [2003-09-16 13:19:51 -0400]:
> >
> > On Tue, Sep 16, 2003 at 10:42:49AM -0400, Sam Steingold wrote:
> > >>* Corinna Vinschen <pbevaan-pltjva@pltjva.pbz> [2003-09-16 12:01:08 +0200]:
> > >>
> > >> On Mon, Sep 15, 2003 at 05:19:16PM -0400, Sam Steingold wrote:
> > >> > calling isatty(0) in a program results in a segfault:
> > >> And the version number of the DLL is ...
> > >
> > >1.5.4(0.94/3/2)
> > >
> > >> Fd 0 is a tty, a console window, a tape drive, a ...
> > >
> > >I am doing this in a windows console, as created by clicking on the
> > >cygwin icon, i.e., in the bash shell.
> > >I assume that 0 means stdin.
> > >
> > >> Reproducible testcase is ...
> > >
> > >------- scratch.c ----
> > >#include <stdio.h>
> > >int main (void) {
> > >#define Y_N(x)  ((x) ? "(TTY)" : "(not a TTY)")
> > >  printf("0: %s %s\n1: %s %s\n2: %s %s\n",
> > >         ttyname(0),Y_N(isatty(0)),ttyname(1),Y_N(isatty(1)),
> > >         ttyname(2),Y_N(isatty(2)))
                                        ^
> > >#undef Y_N
> > >  return 0;
> > >}
> > >------- scratch.c ----
> >
> > Fixing the obvious typo in the above provides the desired results both
> > inside gdb and outside gdb.  With CYGWIN=tty and with CYGWIN=notty.
>
> what is the "obvious typo"?

Aw, come on, try to at least *compile* the code you posted, will ya? ;-)
	Igor
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