Index: kern_jail.c
===================================================================
RCS file: /home/dcvs/src/sys/kern/kern_jail.c,v
retrieving revision 1.9
diff -u -r1.9 kern_jail.c
--- kern_jail.c	8 Oct 2005 11:43:02 -0000	1.9
+++ kern_jail.c	19 Mar 2006 20:26:29 -0000
@@ -317,6 +317,20 @@
 SYSCTL_OID(_jail, OID_AUTO, list, CTLTYPE_STRUCT | CTLFLAG_RD, NULL, 0,
 	   sysctl_jail_list, "S", "List of active jails");
 
+static int
+sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
+{
+	struct proc *p = curthread->td_proc;
+	int error, injail;
+
+	injail = jailed(p->p_ucred);
+	error = SYSCTL_OUT(req, &injail, sizeof(injail));
+	return(error);
+}
+
+SYSCTL_PROC(_jail, OID_AUTO, jailed, CTLTYPE_INT | CTLFLAG_RD, NULL, 0,
+	    sysctl_jail_jailed, "I", "Process in jail?");
+
 void
 prison_hold(struct prison *pr)
 {