static int n_tty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) { int retval; switch (cmd) { case TIOCOUTQ: return put_user(tty_chars_in_buffer(tty), (int __user *) arg); case TIOCINQ: retval = tty->read_cnt; if (L_ICANON(tty)) retval = inq_canon(tty); return put_user(retval, (unsigned int __user *) arg); default: return n_tty_ioctl_helper(tty, file, cmd, arg); } }
int tty_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg) { struct tty_struct * tty; struct tty_struct * other_tty; struct tty_struct * termios_tty; pid_t pgrp; int dev; int termios_dev; int retval; if (MAJOR(file->f_rdev) != TTY_MAJOR) { printk("tty_ioctl: tty pseudo-major != TTY_MAJOR\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; if (IS_A_PTY_MASTER(dev)) { termios_tty = other_tty; termios_dev = PTY_OTHER(dev); } else { termios_tty = tty; termios_dev = dev; } switch (cmd) { case TCGETS: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (struct termios)); if (retval) return retval; memcpy_tofs((struct termios *) arg, termios_tty->termios, sizeof (struct termios)); return 0; case TCSETSF: case TCSETSW: case TCSETS: retval = check_change(termios_tty, termios_dev); if (retval) return retval; if (cmd == TCSETSF || cmd == TCSETSW) { if (cmd == TCSETSF) flush_input(termios_tty); wait_until_sent(termios_tty, 0); } return set_termios(termios_tty, (struct termios *) arg, termios_dev); case TCGETA: return get_termio(termios_tty,(struct termio *) arg); case TCSETAF: case TCSETAW: case TCSETA: retval = check_change(termios_tty, termios_dev); if (retval) return retval; if (cmd == TCSETAF || cmd == TCSETAW) { if (cmd == TCSETAF) flush_input(termios_tty); wait_until_sent(termios_tty, 0); } return set_termio(termios_tty, (struct termio *) arg, termios_dev); case TCXONC: retval = check_change(tty, dev); if (retval) return retval; switch (arg) { case TCOOFF: stop_tty(tty); break; case TCOON: start_tty(tty); break; case TCIOFF: if (STOP_CHAR(tty) != __DISABLED_CHAR) put_tty_queue(STOP_CHAR(tty), &tty->write_q); break; case TCION: if (START_CHAR(tty) != __DISABLED_CHAR) put_tty_queue(START_CHAR(tty), &tty->write_q); break; default: return -EINVAL; } return 0; case TCFLSH: retval = check_change(tty, dev); if (retval) return retval; switch (arg) { case TCIFLUSH: flush_input(tty); break; case TCIOFLUSH: flush_input(tty); /* fall through */ case TCOFLUSH: flush_output(tty); break; default: return -EINVAL; } return 0; case TIOCEXCL: set_bit(TTY_EXCLUSIVE, &tty->flags); return 0; case TIOCNXCL: clear_bit(TTY_EXCLUSIVE, &tty->flags); return 0; case TIOCSCTTY: if (current->leader && (current->session == tty->session)) return 0; /* * The process must be a session leader and * not have a controlling tty already. */ if (!current->leader || (current->tty >= 0)) return -EPERM; if (tty->session > 0) { /* * This tty is already the controlling * tty for another session group! */ if ((arg == 1) && suser()) { /* * Steal it away */ struct task_struct *p; for_each_task(p) if (p->tty == dev) p->tty = -1; } else return -EPERM; } current->tty = dev; tty->session = current->session; tty->pgrp = current->pgrp; return 0; case TIOCGPGRP: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (pid_t)); if (retval) return retval; if (current->tty != termios_dev) return -ENOTTY; put_fs_long(termios_tty->pgrp, (pid_t *) arg); return 0; case TIOCSPGRP: retval = check_change(termios_tty, termios_dev); if (retval) return retval; if ((current->tty < 0) || (current->tty != termios_dev) || (termios_tty->session != current->session)) return -ENOTTY; pgrp = get_fs_long((pid_t *) arg); if (pgrp < 0) return -EINVAL; if (session_of_pgrp(pgrp) != current->session) return -EPERM; termios_tty->pgrp = pgrp; return 0; case TIOCOUTQ: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (unsigned long)); if (retval) return retval; put_fs_long(CHARS(&tty->write_q), (unsigned long *) arg); return 0; case TIOCINQ: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (unsigned long)); if (retval) return retval; if (L_ICANON(tty)) put_fs_long(inq_canon(tty), (unsigned long *) arg); else put_fs_long(CHARS(&tty->secondary), (unsigned long *) arg); return 0; case TIOCSTI: if ((current->tty != dev) && !suser()) return -EPERM; retval = verify_area(VERIFY_READ, (void *) arg, 1); if (retval) return retval; put_tty_queue(get_fs_byte((char *) arg), &tty->read_q); TTY_READ_FLUSH(tty); return 0; case TIOCGWINSZ: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (struct winsize)); if (retval) return retval; memcpy_tofs((struct winsize *) arg, &tty->winsize, sizeof (struct winsize)); return 0; 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 TIOCLINUX: switch (get_fs_byte((char *)arg)) { case 0: return do_screendump(arg); case 1: return do_get_ps_info(arg); #ifdef CONFIG_SELECTION case 2: return set_selection(arg); case 3: return paste_selection(tty); case 4: unblank_screen(); return 0; #endif /* CONFIG_SELECTION */ default: return -EINVAL; } case TIOCCONS: if (IS_A_CONSOLE(dev)) { if (!suser()) return -EPERM; redirect = NULL; return 0; } if (redirect) return -EBUSY; if (!suser()) return -EPERM; if (IS_A_PTY_MASTER(dev)) redirect = other_tty; else if (IS_A_PTY_SLAVE(dev)) redirect = tty; else return -ENOTTY; return 0; case FIONBIO: arg = get_fs_long((unsigned long *) arg); if (arg) file->f_flags |= O_NONBLOCK; else file->f_flags &= ~O_NONBLOCK; return 0; case TIOCNOTTY: if (current->tty != dev) return -ENOTTY; if (current->leader) disassociate_ctty(0); current->tty = -1; return 0; case TIOCGETD: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (unsigned long)); if (retval) return retval; put_fs_long(tty->disc, (unsigned long *) arg); return 0; case TIOCSETD: retval = check_change(tty, dev); if (retval) return retval; arg = get_fs_long((unsigned long *) arg); return tty_set_ldisc(tty, arg); case TIOCGLCKTRMIOS: arg = get_fs_long((unsigned long *) arg); retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (struct termios)); if (retval) return retval; memcpy_tofs((struct termios *) arg, &termios_locked[termios_dev], sizeof (struct termios)); return 0; case TIOCSLCKTRMIOS: if (!suser()) return -EPERM; arg = get_fs_long((unsigned long *) arg); memcpy_fromfs(&termios_locked[termios_dev], (struct termios *) arg, sizeof (struct termios)); return 0; case TIOCPKT: if (!IS_A_PTY_MASTER(dev)) return -ENOTTY; retval = verify_area(VERIFY_READ, (void *) arg, sizeof (unsigned long)); if (retval) return retval; if (get_fs_long(arg)) { if (!tty->packet) { tty->packet = 1; tty->link->ctrl_status = 0; } } else tty->packet = 0; return 0; case TCSBRK: case TCSBRKP: retval = check_change(tty, dev); if (retval) return retval; wait_until_sent(tty, 0); if (!tty->ioctl) return 0; tty->ioctl(tty, file, cmd, arg); return 0; default: if (tty->ioctl) { retval = (tty->ioctl)(tty, file, cmd, arg); if (retval != -EINVAL) return retval; } if (ldiscs[tty->disc].ioctl) { retval = (ldiscs[tty->disc].ioctl) (tty, file, cmd, arg); return retval; } return -EINVAL; }
int n_tty_ioctl(struct tty_struct * tty, struct file * file, unsigned int cmd, unsigned long arg) { struct tty_struct * real_tty; int retval; if (tty->driver->type == TTY_DRIVER_TYPE_PTY && tty->driver->subtype == PTY_TYPE_MASTER) real_tty = tty->link; else real_tty = tty; switch (cmd) { #ifdef TIOCGETP case TIOCGETP: return get_sgttyb(real_tty, (struct sgttyb *) arg); case TIOCSETP: case TIOCSETN: return set_sgttyb(real_tty, (struct sgttyb *) arg); #endif #ifdef TIOCGETC case TIOCGETC: return get_tchars(real_tty, (struct tchars *) arg); case TIOCSETC: return set_tchars(real_tty, (struct tchars *) arg); #endif #ifdef TIOCGLTC case TIOCGLTC: return get_ltchars(real_tty, (struct ltchars *) arg); case TIOCSLTC: return set_ltchars(real_tty, (struct ltchars *) arg); #endif case TCGETS: if (kernel_termios_to_user_termios((struct termios *)arg, real_tty->termios)) return -EFAULT; return 0; case TCSETSF: return set_termios(real_tty, arg, TERMIOS_FLUSH | TERMIOS_WAIT); case TCSETSW: return set_termios(real_tty, arg, TERMIOS_WAIT); case TCSETS: return set_termios(real_tty, arg, 0); case TCGETA: return get_termio(real_tty,(struct termio *) arg); case TCSETAF: return set_termios(real_tty, arg, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO); case TCSETAW: return set_termios(real_tty, arg, TERMIOS_WAIT | TERMIOS_TERMIO); case TCSETA: return set_termios(real_tty, arg, TERMIOS_TERMIO); case TCXONC: retval = tty_check_change(tty); if (retval) return retval; switch (arg) { case TCOOFF: if (!tty->flow_stopped) { tty->flow_stopped = 1; stop_tty(tty); } break; case TCOON: if (tty->flow_stopped) { tty->flow_stopped = 0; start_tty(tty); } break; case TCIOFF: if (STOP_CHAR(tty) != __DISABLED_CHAR) send_prio_char(tty, STOP_CHAR(tty)); break; case TCION: if (START_CHAR(tty) != __DISABLED_CHAR) send_prio_char(tty, START_CHAR(tty)); break; default: return -EINVAL; } return 0; case TCFLSH: retval = tty_check_change(tty); if (retval) return retval; switch (arg) { case TCIFLUSH: if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty); break; case TCIOFLUSH: if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty); /* fall through */ case TCOFLUSH: if (tty->driver->flush_buffer) tty->driver->flush_buffer(tty); break; default: return -EINVAL; } return 0; case TIOCOUTQ: return put_user(tty->driver->chars_in_buffer ? tty->driver->chars_in_buffer(tty) : 0, (int *) arg); case TIOCINQ: retval = tty->read_cnt; if (L_ICANON(tty)) retval = inq_canon(tty); return put_user(retval, (unsigned int *) arg); case TIOCGLCKTRMIOS: if (kernel_termios_to_user_termios((struct termios *)arg, real_tty->termios_locked)) return -EFAULT; return 0; case TIOCSLCKTRMIOS: if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios *) arg)) return -EFAULT; return 0; case TIOCPKT: { int pktmode; if (tty->driver->type != TTY_DRIVER_TYPE_PTY || tty->driver->subtype != PTY_TYPE_MASTER) return -ENOTTY; if (get_user(pktmode, (int *) arg)) return -EFAULT; if (pktmode) { if (!tty->packet) { tty->packet = 1; tty->link->ctrl_status = 0; } } else tty->packet = 0; return 0; } case TIOCGSOFTCAR: return put_user(C_CLOCAL(tty) ? 1 : 0, (int *) arg); case TIOCSSOFTCAR: if (get_user(arg, (unsigned int *) arg)) return -EFAULT; tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0)); return 0; default: return -ENOIOCTLCMD; } }