[Bug libc/24941] Make grantpt usable after multi-threaded fork in more cases

["gabriel at inconstante dot net.br" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=24941

--- Comment #7 from Gabriel F. T. Gomes <gabriel at inconstante dot net.br> ---
Created attachment 12060
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12060&action=edit
Reproducer

(In reply to Florian Weimer from comment #5)
> Should we add your test program as a regular test case? Would you please
> attach it to this bug? Thanks.

I don't think we should add it as a new test case to the test suite, because it
is supposed to fail when --with-tty-gid is not used in the configure step (the
default).

Anyway, test case attached.  It hangs when built and ran with current glibc
sources, but doesn't hang when the patch is applied.

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