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tty_ioctl.c
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tty_ioctl.c
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/*
* linux/kernel/chr_drv/tty_ioctl.c
*
* (C) 1991 Linus Torvalds
*/
#include <errno.h>
#include <termios.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/tty.h>
#include <asm/io.h>
#include <asm/segment.h>
#include <asm/system.h>
extern int session_of_pgrp(int pgrp);
extern int tty_signal(int sig, struct tty_struct *tty);
static unsigned short quotient[] = {
0, 2304, 1536, 1047, 857,
768, 576, 384, 192, 96,
64, 48, 24, 12, 6, 3
};
static void change_speed(struct tty_struct * tty)
{
unsigned short port,quot;
if (!(port = tty->read_q->data))
return;
quot = quotient[tty->termios.c_cflag & CBAUD];
cli();
outb_p(0x80,port+3); /* set DLAB */
outb_p(quot & 0xff,port); /* LS of divisor */
outb_p(quot >> 8,port+1); /* MS of divisor */
outb(0x03,port+3); /* reset DLAB */
sti();
}
static void flush(struct tty_queue * queue)
{
cli();
queue->head = queue->tail;
sti();
}
static void wait_until_sent(struct tty_struct * tty)
{
/* do nothing - not implemented */
}
static void send_break(struct tty_struct * tty)
{
/* do nothing - not implemented */
}
static int get_termios(struct tty_struct * tty, struct termios * termios)
{
int i;
verify_area(termios, sizeof (*termios));
for (i=0 ; i< (sizeof (*termios)) ; i++)
put_fs_byte( ((char *)&tty->termios)[i] , i+(char *)termios );
return 0;
}
static int set_termios(struct tty_struct * tty, struct termios * termios,
int channel)
{
int i, retsig;
/* If we try to set the state of terminal and we're not in the
foreground, send a SIGTTOU. If the signal is blocked or
ignored, go ahead and perform the operation. POSIX 7.2) */
if ((current->tty == channel) && (tty->pgrp != current->pgrp)) {
retsig = tty_signal(SIGTTOU, tty);
if (retsig == -ERESTARTSYS || retsig == -EINTR)
return retsig;
}
for (i=0 ; i< (sizeof (*termios)) ; i++)
((char *)&tty->termios)[i]=get_fs_byte(i+(char *)termios);
change_speed(tty);
return 0;
}
static int get_termio(struct tty_struct * tty, struct termio * termio)
{
int i;
struct termio tmp_termio;
verify_area(termio, sizeof (*termio));
tmp_termio.c_iflag = tty->termios.c_iflag;
tmp_termio.c_oflag = tty->termios.c_oflag;
tmp_termio.c_cflag = tty->termios.c_cflag;
tmp_termio.c_lflag = tty->termios.c_lflag;
tmp_termio.c_line = tty->termios.c_line;
for(i=0 ; i < NCC ; i++)
tmp_termio.c_cc[i] = tty->termios.c_cc[i];
for (i=0 ; i< (sizeof (*termio)) ; i++)
put_fs_byte( ((char *)&tmp_termio)[i] , i+(char *)termio );
return 0;
}
/*
* This only works as the 386 is low-byt-first
*/
static int set_termio(struct tty_struct * tty, struct termio * termio,
int channel)
{
int i, retsig;
struct termio tmp_termio;
if ((current->tty == channel) && (tty->pgrp != current->pgrp)) {
retsig = tty_signal(SIGTTOU, tty);
if (retsig == -ERESTARTSYS || retsig == -EINTR)
return retsig;
}
for (i=0 ; i< (sizeof (*termio)) ; i++)
((char *)&tmp_termio)[i]=get_fs_byte(i+(char *)termio);
*(unsigned short *)&tty->termios.c_iflag = tmp_termio.c_iflag;
*(unsigned short *)&tty->termios.c_oflag = tmp_termio.c_oflag;
*(unsigned short *)&tty->termios.c_cflag = tmp_termio.c_cflag;
*(unsigned short *)&tty->termios.c_lflag = tmp_termio.c_lflag;
tty->termios.c_line = tmp_termio.c_line;
for(i=0 ; i < NCC ; i++)
tty->termios.c_cc[i] = tmp_termio.c_cc[i];
change_speed(tty);
return 0;
}
int tty_ioctl(int dev, int cmd, int arg)
{
struct tty_struct * tty;
int pgrp;
if (MAJOR(dev) == 5) {
dev=current->tty;
if (dev<0)
panic("tty_ioctl: dev<0");
} else
dev=MINOR(dev);
tty = tty_table + (dev ? ((dev < 64)? dev-1:dev) : fg_console);
switch (cmd) {
case TCGETS:
return get_termios(tty,(struct termios *) arg);
case TCSETSF:
flush(tty->read_q); /* 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(tty->read_q); /* fallthrough */
case TCSETAW:
wait_until_sent(tty); /* fallthrough */
case TCSETA:
return set_termio(tty,(struct termio *) arg, dev);
case TCSBRK:
if (!arg) {
wait_until_sent(tty);
send_break(tty);
}
return 0;
case TCXONC:
switch (arg) {
case TCOOFF:
tty->stopped = 1;
tty->write(tty);
return 0;
case TCOON:
tty->stopped = 0;
tty->write(tty);
return 0;
case TCIOFF:
if (STOP_CHAR(tty))
PUTCH(STOP_CHAR(tty),tty->write_q);
return 0;
case TCION:
if (START_CHAR(tty))
PUTCH(START_CHAR(tty),tty->write_q);
return 0;
}
return -EINVAL; /* not implemented */
case TCFLSH:
if (arg==0)
flush(tty->read_q);
else if (arg==1)
flush(tty->write_q);
else if (arg==2) {
flush(tty->read_q);
flush(tty->write_q);
} 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);
put_fs_long(CHARS(tty->secondary),
(unsigned long *) arg);
return 0;
case TIOCSTI:
return -EINVAL; /* not implemented */
case TIOCGWINSZ:
return -EINVAL; /* not implemented */
case TIOCSWINSZ:
return -EINVAL; /* not implemented */
case TIOCMGET:
return -EINVAL; /* not implemented */
case TIOCMBIS:
return -EINVAL; /* not implemented */
case TIOCMBIC:
return -EINVAL; /* not implemented */
case TIOCMSET:
return -EINVAL; /* not implemented */
case TIOCGSOFTCAR:
return -EINVAL; /* not implemented */
case TIOCSSOFTCAR:
return -EINVAL; /* not implemented */
default:
return -EINVAL;
}
}