Consolidate pthread_atfork

The pthread_atfork is similar between Linux and Hurd, only the compat
version bits differs.  The generic version is place at sysdeps/pthread
with a common name.

It also fixes an issue with Hurd license, where the static-only object
did not use LGPL + exception.

Checked on x86_64-linux-gnu, i686-linux-gnu, and with a build for
i686-gnu.

3 files changed, 4 insertions, 67 deletions

diff --git a/sysdeps/htl/old_pt-atfork.c b/sysdeps/htl/old_pt-atfork.c
deleted file mode 100644
index ca38d6ca42..0000000000
--- a/sysdeps/htl/old_pt-atfork.c
+++ /dev/null
@@ -1,26 +0,0 @@
-/* Register fork handlers.  Generic version.
-   Copyright (C) 2002-2021 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library;  if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#include <shlib-compat.h>
-
-#if SHLIB_COMPAT(libpthread, GLIBC_2_12, GLIBC_2_23)
-# define __pthread_atfork __dyn_pthread_atfork
-# include "pt-atfork.c"
-# undef __pthread_atfork
-compat_symbol (libpthread, __dyn_pthread_atfork, pthread_atfork, GLIBC_2_12);
-#endif
diff --git a/sysdeps/htl/pt-atfork.c b/sysdeps/htl/pt-atfork.c
deleted file mode 100644
index 3902f40835..0000000000
--- a/sysdeps/htl/pt-atfork.c
+++ /dev/null
@@ -1,41 +0,0 @@
-/* Register fork handlers.  Generic version.
-   Copyright (C) 2002-2021 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library;  if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#include <pthread.h>
-#include <pt-internal.h>
-#include <dso_handle.h>
-#include <register-atfork.h>
-
-/* Hide the symbol so that no definition but the one locally in the
-   executable or DSO is used.  */
-int
-#ifndef __pthread_atfork
-/* Don't mark the compatibility function as hidden.  */
-attribute_hidden
-#endif
-__pthread_atfork (void (*prepare) (void),
-		void (*parent) (void),
-		void (*child) (void))
-{
-  return __register_atfork (prepare, parent, child, __dso_handle);
-}
-#ifndef __pthread_atfork
-extern int pthread_atfork (void (*prepare) (void), void (*parent) (void),
-                           void (*child) (void)) attribute_hidden;
-weak_alias (__pthread_atfork, pthread_atfork)
-#endif
diff --git a/sysdeps/htl/pthread_atfork_compat.h b/sysdeps/htl/pthread_atfork_compat.h
new file mode 100644
index 0000000000..08afccbb3c
--- /dev/null
+++ b/sysdeps/htl/pthread_atfork_compat.h
@@ -0,0 +1,4 @@
+/* The compat version for the dynamic pthread_atfork provided by libpthread,
+   before supported __dso_handle was added.  */
+#define PTHREAD_ATFORK_COMPAT_INTRODUCED  GLIBC_2_12
+#define PTHREAD_ATFORK_COMPAT_OBSOLETED   GLIBC_2_23