Move nss_compat from nis to nss subdir and install it unconditionally

This has been tested that local lookup still works with and
without an installed libnss_nis, and that NIS lookup works when
libnss_nis is available.

1 files changed, 58 insertions, 0 deletions

diff --git a/nss/nss_compat/nisdomain.c b/nss/nss_compat/nisdomain.c
new file mode 100644
index 0000000000..220ae27234
--- /dev/null
+++ b/nss/nss_compat/nisdomain.c
@@ -0,0 +1,58 @@
+/* Copyright (C) 2017 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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <libc-lock.h>
+#include "nisdomain.h"
+
+#define MAXDOMAINNAMELEN 1024
+
+static char domainname[MAXDOMAINNAMELEN];
+
+__libc_lock_define_initialized (static, domainname_lock)
+
+int
+__nss_get_default_domain (char **outdomain)
+{
+  int result = 0;
+  *outdomain = NULL;
+
+  __libc_lock_lock (domainname_lock);
+
+  if (domainname[0] != '\0')
+    {
+      if (getdomainname (domainname, MAXDOMAINNAMELEN) < 0)
+	result = errno;
+      else if (strcmp (domainname, "(none)") == 0)
+	{
+	  /* If domainname is not set, some systems will return "(none)" */
+	  domainname[0] = '\0';
+	  result = ENOENT;
+	}
+      else
+	*outdomain = domainname;
+    }
+  else
+    *outdomain = domainname;
+
+  __libc_lock_unlock (domainname_lock);
+
+  return result;
+}