From 17432d7150bdab3bce2ea66c70ad6c920f54077a Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Fri, 28 Jun 2019 10:15:30 +0200
Subject: support: Add xdlvsym function

---
 support/xdlfcn.c | 20 ++++++++++++++++++++
 support/xdlfcn.h |  1 +
 2 files changed, 21 insertions(+)

(limited to 'support')

diff --git a/support/xdlfcn.c b/support/xdlfcn.c
index b2e5c21..11fe489 100644
--- a/support/xdlfcn.c
+++ b/support/xdlfcn.c
@@ -51,6 +51,26 @@ xdlsym (void *handle, const char *symbol)
   return sym;
 }
 
+void *
+xdlvsym (void *handle, const char *symbol, const char *version)
+{
+  /* Clear any pending errors.  */
+  dlerror ();
+
+  void *sym = dlvsym (handle, symbol, version);
+
+  if (sym == NULL)
+    {
+      const char *error = dlerror ();
+      if (error != NULL)
+        FAIL_EXIT1 ("error: dlvsym: %s\n", error);
+      /* If there was no error, we found a NULL symbol.  Return the
+         NULL value in this case.  */
+    }
+
+  return sym;
+}
+
 void
 xdlclose (void *handle)
 {
diff --git a/support/xdlfcn.h b/support/xdlfcn.h
index c9cd810..7f8d493 100644
--- a/support/xdlfcn.h
+++ b/support/xdlfcn.h
@@ -27,6 +27,7 @@ __BEGIN_DECLS
 void *xdlopen (const char *filename, int flags);
 void *xdlmopen (Lmid_t lmid, const char *filename, int flags);
 void *xdlsym (void *handle, const char *symbol);
+void *xdlvsym (void *handle, const char *symbol, const char *version);
 void xdlclose (void *handle);
 
 __END_DECLS
-- 
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