isatty bug

Christopher Faylor cgf-rcm@cygwin.com
Tue Sep 16 17:22:00 GMT 2003


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.

So, I can't duplicate this problem.

cgf

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