uwrap: Add library constructor and move pthread_atfork inside.

Library constructor is used for pthread_atfork call. Moved here because
pthread_atfork is cumulative and should be called only once.

Signed-off-by: Robin Hack <hack.robin@gmail.com>
Reviewed-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/uid_wrapper/wscript b/lib/uid_wrapper/wscript
index 6b585956e0..bd797e5a72 100644
--- a/lib/uid_wrapper/wscript
+++ b/lib/uid_wrapper/wscript
@@ -21,6 +21,23 @@ def configure(conf):
             addmain=False,
             msg='Checking for thread local storage')
 
+        # check HAVE_CONSTRUCTOR_ATTRIBUTE
+        conf.CHECK_CODE('''
+            void test_constructor_attribute(void) __attribute__ ((constructor));
+
+            void test_constructor_attribute(void)
+            {
+                return;
+            }
+
+            int main(void) {
+                return 0;
+            }
+            ''',
+            'HAVE_CONSTRUCTOR_ATTRIBUTE',
+            addmain=False,
+            msg='Checking for library constructor support')
+
         # check HAVE_DESTRUCTOR_ATTRIBUTE
         conf.CHECK_CODE('''
             void test_destructor_attribute(void) __attribute__ ((destructor));