--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/compat/closefrom.c	Fri Sep 01 22:33:41 2017 +0200
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2017 Guido Berhoerster <guido+pwm@berhoerster.name>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int
+closefrom(int fd_min)
+{
+#ifdef	F_CLOSEM
+	return fcntl(fd_min, F_CLOSEM, 0);
+#else /* !F_CLOSEM */
+	int	fd_max;
+	int	fd;
+
+	fd_max = sysconf(_SC_OPEN_MAX);
+	for (fd = fd_min; fd < fd_max; fd++) {
+		if ((close(fd) < 0) && (errno != EBADF)) {
+			return (-1);
+		}
+	}
+
+	return (0);
+#endif /* !F_CLOSEM */
+}