--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/docs/jls.c	Fri Aug 15 15:43:38 2008 +0000
@@ -0,0 +1,82 @@
+/*-
+ * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
+ * 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.
+ *
+ * $FreeBSD: src/usr.sbin/jls/jls.c,v 1.3 2003/04/22 13:24:56 mike Exp $
+ * $DragonFly: src/usr.sbin/jls/jls.c,v 1.1 2005/01/31 22:29:59 joerg Exp $
+ */
+
+#include <sys/param.h>
+#include <sys/kinfo.h>
+#include <sys/sysctl.h>
+
+#include <err.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+int
+main(void)
+{ 
+	struct kinfo_prison *sxp, *xp;
+	struct in_addr in;
+	size_t i, len;
+
+	if (sysctlbyname("jail.list", NULL, &len, NULL, 0) == -1)
+		err(1, "sysctlbyname(): jail.list");
+retry:
+	if (len == 0)
+		exit(0);	
+
+	sxp = xp = malloc(len);
+	if (sxp == NULL)
+		err(1, "malloc failed");
+
+	if (sysctlbyname("jail.list", xp, &len, NULL, 0) == -1) {
+		if (errno == ENOMEM) {
+			free(sxp);
+			goto retry;
+		}
+		err(1, "sysctlbyname(): jail.list");
+	}
+	if (len < sizeof(*xp) || len % sizeof(*xp) ||
+	    xp->pr_version != KINFO_PRISON_VERSION)
+		errx(1, "Kernel and userland out of sync");
+
+	len /= sizeof(*xp);
+	printf("   JID  IP Address      Hostname                      Path\n");
+	for (i = 0; i < len; i++) {
+		in.s_addr = ntohl(xp->pr_ip);
+		printf("%6d  %-15.15s %-29.29s %.74s\n",
+		    xp->pr_id, inet_ntoa(in), xp->pr_host, xp->pr_path);
+		xp++;
+	}
+	free(sxp);
+	exit(0);
+}
+