xinu: Desktop/xinu_mips-1.0.2.tar/xinu_mips-1.0.2/tty/ttyClose.c Source File

00001 
00007 /* Embedded XINU, Copyright (C) 2007.  All rights reserved. */
00008 
00009 #include <kernel.h>
00010 #include <device.h>
00011 #include <tty.h>
00012 #include <stdlib.h>
00013 
00019 devcall ttyClose(device *pdev)
00020 {
00021         struct tty *ptty;
00022     
00023         ptty = (struct tty *)pdev->controlblk;
00024 
00025         ASSERT(NULL != ptty);
00026 
00027         bzero(ptty, sizeof(struct tty));   /* Clear TTY structure.         */
00028 
00029         pdev->controlblk = (char *)NULL;   /* Clear device IO block.       */
00030         ptty->state      = TTY_STATE_FREE;
00031         return OK;
00032 }