1 files changed, 82 insertions, 0 deletions
diff --git a/libiberty/xatexit.c b/libiberty/xatexit.c
new file mode 100644
index 00000000000..31476c29ddc
--- /dev/null
+++ b/libiberty/xatexit.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 1990 Regents of the University of California.
+ * All rights reserved.
+ *
+ * %sccs.include.redist.c%
+ */
+
+/* Adapted from newlib/libc/stdlib/{,at}exit.[ch].
+   If you use xatexit, you must call xexit instead of exit.  */
+
+#include "ansidecl.h"
+#include "libiberty.h"
+
+#include <stdio.h>
+
+#ifdef __STDC__
+#include <stddef.h>
+#else
+#define size_t unsigned long
+#endif
+
+/* For systems with larger pointers than ints, this must be declared.  */
+PTR malloc PARAMS ((size_t));
+
+static void xatexit_cleanup PARAMS ((void));
+
+/* Pointer to function run by xexit.  */
+extern void (*_xexit_cleanup) PARAMS ((void));
+
+#define	XATEXIT_SIZE 32
+
+struct xatexit {
+	struct	xatexit *next;		/* next in list */
+	int	ind;			/* next index in this table */
+	void	(*fns[XATEXIT_SIZE]) PARAMS ((void));	/* the table itself */
+};
+
+/* Allocate one struct statically to guarantee that we can register
+   at least a few handlers.  */
+static struct xatexit xatexit_first;
+
+/* Points to head of LIFO stack.  */
+static struct xatexit *xatexit_head = &xatexit_first;
+
+/* Register function FN to be run by xexit.
+   Return 0 if successful, -1 if not.  */
+
+int
+xatexit (fn)
+     void (*fn) PARAMS ((void));
+{
+  register struct xatexit *p;
+
+  /* Tell xexit to call xatexit_cleanup.  */
+  if (!_xexit_cleanup)
+    _xexit_cleanup = xatexit_cleanup;
+
+  p = xatexit_head;
+  if (p->ind >= XATEXIT_SIZE)
+    {
+      if ((p = (struct xatexit *) malloc (sizeof *p)) == NULL)
+	return -1;
+      p->ind = 0;
+      p->next = xatexit_head;
+      xatexit_head = p;
+    }
+  p->fns[p->ind++] = fn;
+  return 0;
+}
+
+/* Call any cleanup functions.  */
+
+static void
+xatexit_cleanup ()
+{
+  register struct xatexit *p;
+  register int n;
+
+  for (p = xatexit_head; p; p = p->next)
+    for (n = p->ind; --n >= 0;)
+      (*p->fns[n]) ();
+}