1 files changed, 86 insertions, 0 deletions
diff --git a/ext/libelf/elf_end.c b/ext/libelf/elf_end.c
new file mode 100644
index 000000000..082ca2db4
--- /dev/null
+++ b/ext/libelf/elf_end.c
@@ -0,0 +1,86 @@
+/*-
+ * Copyright (c) 2006 Joseph Koshy
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+#include <sys/mman.h>
+
+#include <assert.h>
+#include "libelf.h"
+#include <stdlib.h>
+
+#include "_libelf.h"
+
+int
+elf_end(Elf *e)
+{
+        Elf *sv;
+        Elf_Scn *scn, *tscn;
+
+        if (e == NULL || e->e_activations == 0)
+                return (0);
+
+        if (--e->e_activations > 0)
+                return (e->e_activations);
+
+        assert(e->e_activations == 0);
+
+        while (e && e->e_activations == 0) {
+                switch (e->e_kind) {
+                case ELF_K_AR:
+                        /*
+                         * If we still have open child descriptors, we
+                         * need to defer reclaiming resources till all
+                         * the child descriptors for the archive are
+                         * closed.
+                         */
+                        if (e->e_u.e_ar.e_nchildren > 0)
+                                return (0);
+                        break;
+                case ELF_K_ELF:
+                        /*
+                         * Reclaim all section descriptors.
+                         */
+                        STAILQ_FOREACH_SAFE(scn, &e->e_u.e_elf.e_scn, s_next, tscn)
+                                scn = _libelf_release_scn(scn);
+                        break;
+                case ELF_K_NUM:
+                        assert(0);
+                default:
+                        break;
+                }
+
+                if (e->e_flags & LIBELF_F_MMAP)
+                        (void) munmap(e->e_rawfile, e->e_rawsize);
+
+                sv = e;
+                if ((e = e->e_parent) != NULL)
+                        e->e_u.e_ar.e_nchildren--;
+                sv = _libelf_release_elf(sv);
+        }
+
+        return (0);
+}
+