1 files changed, 49 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/nscd_setup_thread.c b/REORG.TODO/sysdeps/unix/sysv/linux/nscd_setup_thread.c
new file mode 100644
index 0000000000..0c5694dc15
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/sysv/linux/nscd_setup_thread.c
@@ -0,0 +1,49 @@
+/* Setup of nscd worker threads.  Linux verison.
+   Copyright (C) 2004-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published
+   by the Free Software Foundation; version 2 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.  */
+
+#include <string.h>
+#include <unistd.h>
+#include <nscd.h>
+#include <sysdep.h>
+
+
+int
+setup_thread (struct database_dyn *db)
+{
+#ifdef __NR_set_tid_address
+  /* Only supported when NPTL is used.  */
+  char buf[100];
+  if (confstr (_CS_GNU_LIBPTHREAD_VERSION, buf, sizeof (buf)) >= sizeof (buf)
+      || strncmp (buf, "NPTL", 4) != 0)
+    return 0;
+
+  /* Do not try this at home, kids.  We play with the SETTID address
+     even thought the process is multi-threaded.  This can only work
+     since none of the threads ever terminates.  */
+  INTERNAL_SYSCALL_DECL (err);
+  int r = INTERNAL_SYSCALL (set_tid_address, err, 1,
+			    &db->head->nscd_certainly_running);
+  if (!INTERNAL_SYSCALL_ERROR_P (r, err))
+    /* We know the kernel can reset this field when nscd terminates.
+       So, set the field to a nonzero value which indicates that nscd
+       is certainly running and clients can skip the test.  */
+    return db->head->nscd_certainly_running = 1;
+#endif
+
+  return 0;
+}