--- /dev/null
+++ Libc/Libc-498/util/pty.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 1999, 2007 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright (c) 1990, 1993, 1994
+ *	The Regents of the University of California.  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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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.
+ */
+
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <grp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+#include <util.h>
+#include <syslog.h>
+
+static char ptytemplate[] = "/dev/ptyXX";
+
+int openpty(amaster, aslave, name, termp, winp)
+	int *amaster, *aslave;
+	char *name;
+	struct termios *termp;
+	struct winsize *winp;
+{
+	int master, slave;
+	char *sname;
+
+	if ((master = posix_openpt(O_RDWR|O_NOCTTY)) < 0)
+		return -1;
+	if (grantpt(master) < 0 || unlockpt(master) < 0
+	    || (sname = ptsname(master)) == NULL
+	    || (slave = open(sname, O_RDWR|O_NOCTTY, 0)) < 0) {
+		(void) close(master);
+		return -1;
+	}
+	*amaster = master;
+	*aslave = slave;
+	if (name)
+		strcpy(name, sname);
+	if (termp)
+		(void) tcsetattr(slave, TCSAFLUSH, termp);
+	if (winp)
+		(void) ioctl(slave, TIOCSWINSZ, (char *)winp);
+	return (0);
+}
+
+int
+forkpty(amaster, name, termp, winp)
+	int *amaster;
+	char *name;
+	struct termios *termp;
+	struct winsize *winp;
+{
+	int master, slave, pid;
+
+	if (openpty(&master, &slave, name, termp, winp) == -1)
+		return (-1);
+	switch (pid = fork()) {
+	case -1:
+		return (-1);
+	case 0:
+		/* 
+		 * child
+		 */
+		(void) close(master);
+		/*
+		 * 4300297: login_tty() may fail to set the controlling tty.
+		 * Since we have already forked, the best we can do is to 
+		 * dup the slave as if login_tty() succeeded.
+		 */
+		if (login_tty(slave) < 0) {
+			syslog(LOG_ERR, "forkpty: login_tty could't make controlling tty");
+			(void) dup2(slave, 0);
+			(void) dup2(slave, 1);
+			(void) dup2(slave, 2);
+			if (slave > 2)
+				(void) close(slave);
+		}
+		return (0);
+	}
+	/*
+	 * parent
+	 */
+	*amaster = master;
+	(void) close(slave);
+	return (pid);
+}