[Bug 536] no access to tty on Linux 2.0 and 2.4+libc5

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http://bugzilla.mindrot.org/show_bug.cgi?id=536





------- Additional Comments From dtucker at zip.com.au  2003-05-07 21:05 -------
Created an attachment (id=283)
 --> (http://bugzilla.mindrot.org/attachment.cgi?id=283&action=view)
cttytest.c: Test for broken Linux/glibc/openpty controlling terminal behaviour

OK, the data points we've got are:
broken: 2.0.34 kernel, unknown libc
broken: 2.4.? kernel, libc5
broken: 2.0.38 kernel, glibc 2.0.7 (Debian Slink)
working: kernel 2.4.18, glibc 2.3.2 (Redhat 8)

So it looks like a libc thing.	Searching the glibc ChangeLog:

1999-05-24  Ulrich Drepper  <drepper at cygnus.com>
	* login/openpty.c (openpty): Make sure pty does not because
	controlling TTY.

So it looks like openpty is the culprit.  I have attached a test program that
should detect this.  You made need to link with -lutil.

On Debian Slink:
$ gcc cttytest.c -lutil
$ ./a.out
Test failed: reacquired controlling tty

And on Redhat 8:
$ ./a.out 
Test passed.

I'll wrap it into a configure test and attach a patch.



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