1 files changed, 65 insertions, 0 deletions
diff --git a/lib/libc/stdio/fwalk.c b/lib/libc/stdio/fwalk.c
new file mode 100644
index 0000000..151837b
--- /dev/null
+++ b/lib/libc/stdio/fwalk.c
@@ -0,0 +1,65 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * 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.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 sccsid[] = "@(#)fwalk.c	8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <stdio.h>
+#include "local.h"
+#include "glue.h"
+
+int
+_fwalk(int (*function)(FILE *))
+{
+	FILE *fp;
+	int n, ret;
+	struct glue *g;
+
+	ret = 0;
+	/*
+	 * It should be safe to walk the list without locking it;
+	 * new nodes are only added to the end and none are ever
+	 * removed.
+	 *
+	 * Avoid locking this list while walking it or else you will
+	 * introduce a potential deadlock in [at least] refill.c.
+	 */
+	for (g = &__sglue; g != NULL; g = g->next)
+		for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)
+			if ((fp->_flags != 0) && ((fp->_flags & __SIGN) == 0))
+				ret |= (*function)(fp);
+	return (ret);
+}