Desktop/xinu_mips-1.0.2.tar/xinu_mips-1.0.2/tty/ttyAlloc.c

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/* Embedded XINU, Copyright (C) 2007.  All rights reserved. */

#include <kernel.h>
#include <device.h>
#include <tty.h>

struct tty *ttyAlloc(void)
{
        irqmask  ps;
        int      i;

        ps = disable();
        for (i = 0; i < NTTY; ++i)
    {
                if (TTY_STATE_FREE == ttytab[i].state) 
                {
                        ttytab[i].state = TTY_STATE_ALLOC;
                        restore(ps);
                        return &ttytab[i];
                }
    }
        restore(ps);
        return NULL;
}

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