1 files changed, 83 insertions, 0 deletions

diff --git a/src/lib/libc/stdlib/atexit.c b/src/lib/libc/stdlib/atexit.c
new file mode 100644
index 0000000000..92c4884f28
--- /dev/null
+++ b/src/lib/libc/stdlib/atexit.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2002 Daniel Hartmeier
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *    - Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    - 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT HOLDERS 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.
+ *
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char *rcsid = "$OpenBSD: atexit.c,v 1.5 2002/08/30 07:58:07 dhartmei Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <stdlib.h>
+#include "atexit.h"
+
+int __atexit_invalid = 1;
+struct atexit *__atexit;
+
+/*
+ * Register a function to be performed at exit.
+ */
+int
+atexit(fn)
+        void (*fn)();
+{
+        register struct atexit *p = __atexit;
+        register int pgsize = getpagesize();
+
+        if (pgsize < sizeof(*p))
+                return (-1);
+        if (p != NULL) {
+                if (p->ind + 1 >= p->max)
+                        p = NULL;
+                else if (mprotect(p, pgsize, PROT_READ | PROT_WRITE))
+                        return (-1);
+        }
+        if (p == NULL) {
+                if (__atexit_invalid) {
+                        /* malloc.c wants the first mmap() for sbrk()
+                           games ('nice hack'), so enforce
+                           malloc_init() with a dummy call.  */
+                        free(malloc(1));
+                        __atexit_invalid = 0;
+                }
+                p = mmap(NULL, pgsize, PROT_READ | PROT_WRITE,
+                    MAP_ANON | MAP_PRIVATE, -1, 0);
+                if (p == MAP_FAILED)
+                        return (-1);
+                p->ind = 0;
+                p->max = (pgsize - ((char *)&p->fns[0] - (char *)p)) /
+                    sizeof(p->fns[0]);
+                p->next = __atexit;
+                __atexit = p;
+        }
+        p->fns[p->ind++] = fn;
+        if (mprotect(p, pgsize, PROT_READ))
+                return (-1);
+        return (0);
+}