int tty_ioctl(struct inode *inode, struct file *file, int cmd, register char *arg)
{
register struct tty *tty = determine_tty(inode->i_rdev);
int ret;
switch (cmd) {
case TCGETS:
ret = verified_memcpy_tofs(arg, &tty->termios, sizeof(struct termios));
break;
case TCSETS:
case TCSETSW:
case TCSETSF:
ret = verified_memcpy_fromfs(&tty->termios, arg, sizeof(struct termios));
/* Inform driver that things have changed */
if (tty->ops->ioctl != NULL)
tty->ops->ioctl(tty, cmd, arg);
break;
default:
ret = (tty->ops->ioctl == NULL)
? -EINVAL
: tty->ops->ioctl(tty, cmd, arg);
}
return ret;
}
int tty_open(struct inode *inode, struct file *file)
{
register struct tty *otty;
register __ptask currentp = current;
int err;
if (!(otty = determine_tty(inode->i_rdev)))
return -ENODEV;
#if 0
memcpy(&otty->termios, &def_vals, sizeof(struct termios));
#endif
err = otty->ops->open(otty);
if (err)
return err;
if (otty->pgrp == NULL && currentp->session == currentp->pid
&& currentp->tty == NULL) {
otty->pgrp = currentp->pgrp;
currentp->tty = otty;
}
otty->flags |= TTY_OPEN;
chq_init(&otty->inq, otty->inq_buf, INQ_SIZE);
chq_init(&otty->outq, otty->outq_buf, OUTQ_SIZE);
return 0;
}
int tty_release(struct inode *inode, struct file *file)
{
register struct tty *rtty;
rtty = determine_tty(inode->i_rdev);
if (!rtty)
return -ENODEV;
if (current->pid == rtty->pgrp) {
kill_pg(rtty->pgrp, SIGHUP, 1);
rtty->pgrp = NULL;
}
rtty->flags &= ~TTY_OPEN;
return rtty->ops->release(rtty);
}
int tty_write(struct inode *inode, struct file *file, char *data, int len)
{
register struct tty *tty = determine_tty(inode->i_rdev);
register char *pi;
#if 0
int blocking = (file->f_flags & O_NONBLOCK) ? 0 : 1;
#endif
pi = (char *)len;
while ((int)(pi--)) {
tty_charout(tty,
get_user_char((void *)(data++))
/* , blocking */ );
}
return len;
}
int tty_write(struct inode *inode, struct file *file, char *data, int len)
{
register struct tty *tty = determine_tty(inode->i_rdev);
register char *pi;
#if 0
int blocking = (file->f_flags & O_NONBLOCK) ? 0 : 1;
#endif
__u16 tmp;
pi = 0;
while (((int)pi) < len) {
tmp = peekb(current->t_regs.ds, (__u16) (data + ((int)pi)));
tty_charout(tty, (unsigned char) tmp /* , blocking */ );
++pi;
}
tty->ops->write(tty);
return (int)pi;
}
int tty_select(struct inode *inode, /* how revolting, K&R style defs */
struct file *file, int sel_type)
{
register struct tty *tty = determine_tty(inode->i_rdev);
register char *ret = 0;
switch (sel_type) {
case SEL_IN:
if (chq_peekch(&tty->inq))
return 1;
select_wait(&tty->inq.wq);
break;
case SEL_OUT:
ret = (char *)(!chq_full(&tty->outq));
if (!ret)
select_wait(&tty->outq.wq);
/*@fallthrough@*/
/* case SEL_EX: */
/* break; */
}
return (int) ret;
}
int tty_read(struct inode *inode, struct file *file, char *data, int len)
{
#if 1
register struct tty *tty = determine_tty(inode->i_rdev);
register char *pi = 0;
int j, k;
int rawmode = (tty->termios.c_lflag & ICANON) ? 0 : 1;
int blocking = (file->f_flags & O_NONBLOCK) ? 0 : 1;
unsigned char ch;
if (len != 0) {
do {
if (tty->ops->read) {
tty->ops->read(tty);
blocking = 0;
}
j = chq_getch(&tty->inq, &ch, blocking);
if (j == -1) {
if (!blocking)
break;
return -EINTR;
}
if (!rawmode && (j == 04)) /* CTRL-D */
break;
if (rawmode || (j != '\b')) {
pokeb(current->t_regs.ds, (__u16) (data + ((int)pi)), ch);
++pi;
tty_echo(tty, ch);
} else if (((int)pi) > 0) {
--pi;
k = ((peekb(current->t_regs.ds, (__u16) (data + ((int)pi)))
== '\t') ? TAB_SPACES : 1);
do {
tty_echo(tty, ch);
} while (--k);
}
} while (((int)pi) < len && (rawmode || j != '\n'));
}
return (int) pi;
#else
register struct tty *tty = determine_tty(inode->i_rdev);
int i = 0, j = 0, k, lch;
int rawmode = (tty->termios.c_lflag & ICANON) ? 0 : 1;
int blocking = (file->f_flags & O_NONBLOCK) ? 0 : 1;
unsigned char ch;
if (len == 0)
return 0;
do {
if (tty->ops->read) {
tty->ops->read(tty);
blocking = 0;
}
j = chq_getch(&tty->inq, &ch, blocking);
if (j == -1)
if (blocking)
return -EINTR;
else
break;
if (!rawmode && (j == 04)) /* CTRL-D */
break;
if (rawmode || (j != '\b')) {
pokeb(current->t_regs.ds, (__u16) (data + i++), ch);
tty_echo(tty, ch);
} else if (i > 0) {
lch = ((peekb(current->t_regs.ds, (__u16) (data + --i)) == '\t')
? TAB_SPACES : 1);
for (k = 0; k < lch; k++)
tty_echo(tty, ch);
}
} while (i < len && (rawmode || j != '\n'));
return i;
#endif
}