int tty_read(unsigned channel, char * buf, int nr)
{
struct tty_struct * tty;
char c, * b=buf;
int minimum,time,flag=0;
long oldalarm;
if (channel>2 || nr<0) return -1;
tty = &tty_table[channel];
oldalarm = current->alarm;
time = 10L*tty->termios.c_cc[VTIME];
minimum = tty->termios.c_cc[VMIN];
if (time && !minimum) {
minimum=1;
if (flag=(!oldalarm || time+jiffies<oldalarm))
current->alarm = time+jiffies;
}
if (minimum>nr)
minimum=nr;
while (nr>0) {
if (flag && (current->signal & ALRMMASK)) {
current->signal &= ~ALRMMASK;
break;
}
if (current->signal)
break;
if (EMPTY(tty->secondary) || (L_CANON(tty) &&
!tty->secondary.data && LEFT(tty->secondary)>20)) {
sleep_if_empty(&tty->secondary);
continue;
}
do {
GETCH(tty->secondary,c);
if (c==EOF_CHAR(tty) || c==10)
tty->secondary.data--;
if (c==EOF_CHAR(tty) && L_CANON(tty))
return (b-buf);
else {
put_fs_byte(c,b++);
if (!--nr)
break;
}
} while (nr>0 && !EMPTY(tty->secondary));
if (time && !L_CANON(tty))
if (flag=(!oldalarm || time+jiffies<oldalarm))
current->alarm = time+jiffies;
else
current->alarm = oldalarm;
if (L_CANON(tty)) {
if (b-buf)
break;
} else if (b-buf >= minimum)
break;
}
current->alarm = oldalarm;
if (current->signal && !(b-buf))
return -EINTR;
return (b-buf);
}
int tty_ioctl(struct inode * inode, struct file * file,
unsigned int cmd, unsigned int arg)
{
struct tty_struct * tty;
struct tty_struct * other_tty;
int pgrp;
int dev;
if (MAJOR(file->f_rdev) != 4) {
printk("tty_ioctl: tty pseudo-major != 4\n");
return -EINVAL;
}
dev = MINOR(file->f_rdev);
tty = TTY_TABLE(dev);
if (!tty)
return -EINVAL;
if (IS_A_PTY(dev))
other_tty = tty_table[PTY_OTHER(dev)];
else
other_tty = NULL;
switch (cmd) {
case TCGETS:
return get_termios(tty,(struct termios *) arg);
case TCSETSF:
flush_input(tty);
/* fallthrough */
case TCSETSW:
wait_until_sent(tty);
/* fallthrough */
case TCSETS:
return set_termios(tty,(struct termios *) arg, dev);
case TCGETA:
return get_termio(tty,(struct termio *) arg);
case TCSETAF:
flush_input(tty);
/* fallthrough */
case TCSETAW:
wait_until_sent(tty); /* fallthrough */
case TCSETA:
return set_termio(tty,(struct termio *) arg, dev);
case TCXONC:
switch (arg) {
case TCOOFF:
tty->stopped = 1;
TTY_WRITE_FLUSH(tty);
return 0;
case TCOON:
tty->stopped = 0;
TTY_WRITE_FLUSH(tty);
return 0;
case TCIOFF:
if (STOP_CHAR(tty))
put_tty_queue(STOP_CHAR(tty),
&tty->write_q);
return 0;
case TCION:
if (START_CHAR(tty))
put_tty_queue(START_CHAR(tty),
&tty->write_q);
return 0;
}
return -EINVAL; /* not implemented */
case TCFLSH:
if (arg==0)
flush_input(tty);
else if (arg==1)
flush_output(tty);
else if (arg==2) {
flush_input(tty);
flush_output(tty);
} else
return -EINVAL;
return 0;
case TIOCEXCL:
return -EINVAL; /* not implemented */
case TIOCNXCL:
return -EINVAL; /* not implemented */
case TIOCSCTTY:
return -EINVAL; /* set controlling term NI */
case TIOCGPGRP:
verify_area((void *) arg,4);
put_fs_long(tty->pgrp,(unsigned long *) arg);
return 0;
case TIOCSPGRP:
if ((current->tty < 0) ||
(current->tty != dev) ||
(tty->session != current->session))
return -ENOTTY;
pgrp=get_fs_long((unsigned long *) arg);
if (pgrp < 0)
return -EINVAL;
if (session_of_pgrp(pgrp) != current->session)
return -EPERM;
tty->pgrp = pgrp;
return 0;
case TIOCOUTQ:
verify_area((void *) arg,4);
put_fs_long(CHARS(&tty->write_q),
(unsigned long *) arg);
return 0;
case TIOCINQ:
verify_area((void *) arg,4);
if (L_CANON(tty) && !tty->secondary.data)
put_fs_long(0, (unsigned long *) arg);
else
put_fs_long(CHARS(&tty->secondary),
(unsigned long *) arg);
return 0;
case TIOCSTI:
return -EINVAL; /* not implemented */
case TIOCGWINSZ:
return get_window_size(tty,(struct winsize *) arg);
case TIOCSWINSZ:
if (IS_A_PTY_MASTER(dev))
set_window_size(other_tty,(struct winsize *) arg);
return set_window_size(tty,(struct winsize *) arg);
case TIOCGSOFTCAR:
return -EINVAL; /* not implemented */
case TIOCSSOFTCAR:
return -EINVAL; /* not implemented */
case TIOCLINUX:
switch (get_fs_byte((char *)arg))
{
case 0:
return do_screendump(arg);
case 1:
return do_get_ps_info(arg);
default:
return -EINVAL;
}
case TIOCCONS:
if (!IS_A_PTY(dev))
return -EINVAL;
if (redirect)
return -EBUSY;
if (!suser())
return -EPERM;
if (IS_A_PTY_MASTER(dev))
redirect = other_tty;
else
redirect = tty;
return 0;
case FIONBIO:
if (arg)
file->f_flags |= O_NONBLOCK;
else
file->f_flags &= ~O_NONBLOCK;
return 0;
case TIOCNOTTY:
if (MINOR(file->f_rdev) != current->tty)
return -EINVAL;
current->tty = -1;
if (current->leader) {
if (tty->pgrp > 0)
kill_pg(tty->pgrp, SIGHUP, 0);
tty->pgrp = -1;
tty->session = 0;
}
return 0;
case TIOCPKT:
{
int on;
if (!IS_A_PTY_MASTER(dev))
return (-EINVAL);
verify_area ((unsigned long *)arg, sizeof (int));
on=get_fs_long ((unsigned long *)arg);
if (on )
tty->packet = 1;
else
tty->packet = 0;
return (0);
}
default:
if (tty->ioctl)
return (tty->ioctl)(tty, file, cmd, arg);
else
return -EINVAL;
}
}
void copy_to_cooked(struct tty_struct * tty)
{
signed char c;
while (!EMPTY(tty->read_q) && !FULL(tty->secondary)) {
GETCH(tty->read_q,c);
if (c==13)
if (I_CRNL(tty))
c=10;
else if (I_NOCR(tty))
continue;
else ;
else if (c==10 && I_NLCR(tty))
c=13;
if (I_UCLC(tty))
c=tolower(c);
if (L_CANON(tty)) {
if (c==ERASE_CHAR(tty)) {
if (EMPTY(tty->secondary) ||
(c=LAST(tty->secondary))==10 ||
c==EOF_CHAR(tty))
continue;
if (L_ECHO(tty)) {
if (c<32)
PUTCH(127,tty->write_q);
PUTCH(127,tty->write_q);
tty->write(tty);
}
DEC(tty->secondary.head);
continue;
}
if (c==STOP_CHAR(tty)) {
tty->stopped=1;
continue;
}
if (c==START_CHAR(tty)) {
tty->stopped=0;
continue;
}
}
if (!L_ISIG(tty)) {
if (c==INTR_CHAR(tty)) {
tty_intr(tty,SIGINT);
continue;
}
}
if (c==10 || c==EOF_CHAR(tty))
tty->secondary.data++;
if (L_ECHO(tty)) {
if (c==10) {
PUTCH(10,tty->write_q);
PUTCH(13,tty->write_q);
} else if (c<32) {
if (L_ECHOCTL(tty)) {
PUTCH('^',tty->write_q);
PUTCH(c+64,tty->write_q);
}
} else
PUTCH(c,tty->write_q);
tty->write(tty);
}
PUTCH(c,tty->secondary);
}
wake_up(&tty->secondary.proc_list);
}
