tty.c

Go to the documentation of this file.

 
#include <core/system.h>
#include <core/module.h>
#include <dev/ttydev.h>
#include <fs/posix.h>
#include <sys/sched.h>
#include <dev/tty.h>
#include <dev/vt.h>
#include <fs/vfs.h>

struct dev *sttydev_mux(struct devid *dd)
{
#ifdef CONFIG_DEV_UART
    if (dd->minor >= 64)
        return &uart;
#endif
 
#ifdef CONFIG_DEV_CONSOLE
    if (dd->minor <= VT_COUNT)
        return &vtdev;
#endif
 
    return NULL;
}

static int ctty_open(struct file *file)
{
    struct tty *tty = curproc->pgrp->session->ctty;
    struct vnode *vnode = file->vnode;
 
    if (!tty || !tty->vnode)
        return -ENXIO;
 
    tty->vnode->ref++;
    file->vnode = tty->vnode;
 
    int err = kdev_file_open(&VNODE_DEV(tty->vnode), file);
 
    if (err) {
        vfs_close(tty->vnode);
        file->vnode = vnode;
        return err;
    }
 
    vfs_close(vnode);
    return 0;
}
 
static struct dev cttydev = {
    .name = "ctty",
    .fops = {
        .open = ctty_open,
    },
};

struct dev *ttydev_mux(struct devid *dd)
{
    switch (dd->minor) {
        case 0: /* /dev/tty */
            return &cttydev;
        case 1: /* /dev/console: the first virtual terminal or, without
                 * them, the first UART (uart_get()) */
#if defined(CONFIG_DEV_CONSOLE)
            return &vtdev;
#elif defined(CONFIG_DEV_UART)
            return &uart;
#else
            return NULL;
#endif
#ifdef CONFIG_DEV_PTY
        case 2: /* /dev/ptmx */
            return &ptmdev;
#endif
    }
 
    return NULL;
}

int ttydev_probe()
{
    kdev_chrdev_register(4, &sttydev);
    kdev_chrdev_register(5, &ttydev);
    return 0;
}
 
struct dev sttydev = {
    .name  = "sttydev",
    .mux   = sttydev_mux,
};
 
struct dev ttydev = {
    .name  = "ttydev",
    .mux   = ttydev_mux,
};
 
MODULE_INIT(ttydev, ttydev_probe, NULL)