--- libaitio/src/pty.c	2011/09/28 14:36:31	1.1.2.9
+++ libaitio/src/pty.c	2012/04/02 09:10:31	1.3.2.1
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@openbsd-bg.org>
 *
 * $Author: misho $
-* $Id: pty.c,v 1.1.2.9 2011/09/28 14:36:31 misho Exp $
+* $Id: pty.c,v 1.3.2.1 2012/04/02 09:10:31 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -12,7 +12,7 @@ terms:
 All of the documentation and software included in the ELWIX and AITNET
 Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
 
-Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
+Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
 	by Michael Pounov <misho@elwix.org>.  All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
@@ -47,7 +47,8 @@ SUCH DAMAGE.
 
 
 /*
- * ioAllocPTY() Allocate new PTY and TTY
+ * ioAllocPTY() - Allocate new PTY and TTY
+ *
  * @ptyfd = master fd, pty
  * @ttyfd = slave fd, tty
  * @name = tty device name if not null
@@ -76,7 +77,8 @@ ioAllocPTY(int *ptyfd, int *ttyfd, char * __restrict n
 }
 
 /*
- * ioFreePTY() Release PTY and TTY device
+ * ioFreePTY() - Release PTY and TTY device
+ *
  * @ptyfd = master fd, pty (==-1 skip closing pty)
  * @ttyname = tty filename
  * return: none
@@ -90,12 +92,15 @@ ioFreePTY(int ptyfd, const char *ttyname)
 
 	if (ptyfd != -1)
 		close(ptyfd);
-	chown(ttyname, (uid_t) 0, (gid_t) 0);
-	chmod(ttyname, (mode_t) 0666);
+	if (ttyname) {
+		chown(ttyname, (uid_t) 0, (gid_t) 0);
+		chmod(ttyname, (mode_t) 0666);
+	}
 }
 
 /*
- * ioChgWinPTY() Change window size of PTY
+ * ioChgWinPTY() - Change window size of PTY
+ *
  * @ptyfd = master fd, pty
  * @row = row
  * @col = col
@@ -122,7 +127,8 @@ ioChgWinPTY(int ptyfd, u_short row, u_short col, u_sho
 }
 
 /*
- * ioSetOwnerTTY() Set owner to TTY
+ * ioSetOwnerTTY() - Set owner to TTY
+ *
  * @ttyname = tty filename
  * @UID = uid
  * @GID = gid
@@ -171,7 +177,8 @@ ioSetOwnerTTY(const char *ttyname, uid_t UID, gid_t GI
 }
 
 /*
- * ioSetSidTTY() Makes the process's controlling TTY and sets it to sane modes.
+ * ioSetSidTTY() - Makes the process's controlling TTY and sets it to sane modes.
+ *
  * @ttyfd = slave fd, tty
  * @ttyname = tty filename
  * return: -1 error or 0 ok
@@ -232,7 +239,8 @@ ioSetSidTTY(int *ttyfd, const char *ttyname)
 }
 
 /*
- * ioSetRAWMode() Enter into RAW mode
+ * ioSetRAWMode() - Enter into RAW mode
+ *
  * @fd = tty fd
  * @otio = saved old termios for later restore if !=NULL
  * return: -1 error or 0 ok
@@ -271,7 +279,8 @@ ioSetRAWMode(int fd, struct termios *otio)
 }
 
 /*
- * ioRestoreMode() Restore termios to tty fd
+ * ioRestoreMode() - Restore termios to tty fd
+ *
  * @fd = tty fd
  * @tio = termios structure for restore
  * return: -1 error or 0 ok
@@ -288,7 +297,8 @@ ioRestoreMode(int fd, struct termios tio)
 }
 
 /*
- * ioForkPTY() Fork new process with session leader and new TTY
+ * ioForkPTY() - Fork new process with session leader and new TTY
+ *
  * @ptyfd = master fd, pty
  * @name = tty device name if not null
  * @namesiz = name length, must be above 63 bytes.