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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [char/] [tty_ioctl.c] - Rev 1772
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/* * linux/drivers/char/tty_ioctl.c * * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds * * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines * which can be dynamically activated and de-activated by the line * discipline handling modules (like SLIP). */ #include <linux/types.h> #include <linux/termios.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/major.h> #include <linux/tty.h> #include <linux/fcntl.h> #include <linux/string.h> #include <linux/mm.h> #include <asm/io.h> #include <asm/bitops.h> #include <asm/segment.h> #include <asm/system.h> #undef TTY_DEBUG_WAIT_UNTIL_SENT #undef DEBUG #ifdef DEBUG # define PRINTK(x) printk (x) #else # define PRINTK(x) /**/ #endif /* * Internal flag options for termios setting behavior */ #define TERMIOS_FLUSH 1 #define TERMIOS_WAIT 2 #define TERMIOS_TERMIO 4 void tty_wait_until_sent(struct tty_struct * tty, int timeout) { struct wait_queue wait = { current, NULL }; #ifdef TTY_DEBUG_WAIT_UNTIL_SENT printk("%s wait until sent...\n", tty_name(tty)); #endif if (!tty->driver.chars_in_buffer || !tty->driver.chars_in_buffer(tty)) return; add_wait_queue(&tty->write_wait, &wait); current->counter = 0; /* make us low-priority */ if (timeout) current->timeout = timeout + jiffies; else current->timeout = (unsigned) -1; do { #ifdef TTY_DEBUG_WAIT_UNTIL_SENT printk("waiting %s...(%d)\n", tty_name(tty), tty->driver.chars_in_buffer(tty)); #endif current->state = TASK_INTERRUPTIBLE; if (current->signal & ~current->blocked) break; if (!tty->driver.chars_in_buffer(tty)) break; schedule(); } while (current->timeout); current->state = TASK_RUNNING; remove_wait_queue(&tty->write_wait, &wait); } static void unset_locked_termios(struct termios *termios, struct termios *old, struct termios *locked) { int i; #define NOSET_MASK(x,y,z) (x = ((x) & ~(z)) | ((y) & (z))) if (!locked) { printk("Warning?!? termios_locked is NULL.\n"); return; } NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); termios->c_line = locked->c_line ? old->c_line : termios->c_line; for (i=0; i < NCCS; i++) termios->c_cc[i] = locked->c_cc[i] ? old->c_cc[i] : termios->c_cc[i]; } static void change_termios(struct tty_struct * tty, struct termios * new_termios) { int canon_change; struct termios old_termios = *tty->termios; cli(); *tty->termios = *new_termios; unset_locked_termios(tty->termios, &old_termios, tty->termios_locked); canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON; if (canon_change) { memset(&tty->read_flags, 0, sizeof tty->read_flags); tty->canon_head = tty->read_tail; tty->canon_data = 0; tty->erasing = 0; } sti(); if (canon_change && !L_ICANON(tty) && tty->read_cnt) /* Get characters left over from canonical mode. */ wake_up_interruptible(&tty->read_wait); /* see if packet mode change of state */ if (tty->link && tty->link->packet) { int old_flow = ((old_termios.c_iflag & IXON) && (old_termios.c_cc[VSTOP] == '\023') && (old_termios.c_cc[VSTART] == '\021')); int new_flow = (I_IXON(tty) && STOP_CHAR(tty) == '\023' && START_CHAR(tty) == '\021'); if (old_flow != new_flow) { tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); if (new_flow) tty->ctrl_status |= TIOCPKT_DOSTOP; else tty->ctrl_status |= TIOCPKT_NOSTOP; wake_up_interruptible(&tty->link->read_wait); } } if (tty->driver.set_termios) (*tty->driver.set_termios)(tty, &old_termios); if (tty->ldisc.set_termios) (*tty->ldisc.set_termios)(tty, &old_termios); } static int set_termios(struct tty_struct * tty, unsigned long arg, int opt) { struct termios tmp_termios; int retval; retval = tty_check_change(tty); if (retval) return retval; if (opt & TERMIOS_TERMIO) { struct termio tmp_termio; retval = verify_area(VERIFY_READ, (void *) arg, sizeof(struct termio)); if (retval) return retval; tmp_termios = *tty->termios; memcpy_fromfs(&tmp_termio, (struct termio *) arg, sizeof (struct termio)); trans_from_termio(&tmp_termio, &tmp_termios); } else { retval = verify_area(VERIFY_READ, (void *) arg, sizeof(struct termios)); if (retval) return retval; memcpy_fromfs(&tmp_termios, (struct termios *) arg, sizeof (struct termios)); } if ((opt & TERMIOS_FLUSH) && tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty); if (opt & TERMIOS_WAIT) tty_wait_until_sent(tty, 0); change_termios(tty, &tmp_termios); return 0; } static int get_termio(struct tty_struct * tty, struct termio * termio) { int i; struct termio tmp_termio; i = verify_area(VERIFY_WRITE, termio, sizeof (struct termio)); if (i) return i; trans_to_termio(tty->termios, &tmp_termio); memcpy_tofs(termio, &tmp_termio, sizeof (struct termio)); return 0; } static unsigned long inq_canon(struct tty_struct * tty) { int nr, head, tail; if (!tty->canon_data || !tty->read_buf) return 0; head = tty->canon_head; tail = tty->read_tail; nr = (head - tail) & (N_TTY_BUF_SIZE-1); /* Skip EOF-chars.. */ while (head != tail) { if (test_bit(tail, &tty->read_flags) && tty->read_buf[tail] == __DISABLED_CHAR) nr--; tail = (tail+1) & (N_TTY_BUF_SIZE-1); } return nr; } #ifdef TIOCGETP /* * These are deprecated, but there is limited support.. * * The "sg_flags" translation is a joke.. */ static int get_sgflags(struct tty_struct * tty) { int flags = 0; if (!(tty->termios->c_lflag & ICANON)) if (tty->termios->c_lflag & ISIG) flags |= 0x02; /* cbreak */ else flags |= 0x20; /* raw */ if (tty->termios->c_lflag & ECHO) flags |= 0x08; /* echo */ if (tty->termios->c_oflag & OPOST) if (tty->termios->c_oflag & ONLCR) flags |= 0x10; /* crmod */ return flags; } static int get_sgttyb(struct tty_struct * tty, struct sgttyb * sgttyb) { int retval; struct sgttyb tmp; retval = verify_area(VERIFY_WRITE, sgttyb, sizeof(struct sgttyb)); if (retval) return retval; tmp.sg_ispeed = 0; tmp.sg_ospeed = 0; tmp.sg_erase = tty->termios->c_cc[VERASE]; tmp.sg_kill = tty->termios->c_cc[VKILL]; tmp.sg_flags = get_sgflags(tty); memcpy_tofs(sgttyb, &tmp, sizeof(tmp)); return 0; } static void set_sgflags(struct termios * termios, int flags) { termios->c_iflag = ICRNL | IXON; termios->c_oflag = 0; termios->c_lflag = ISIG | ICANON; if (flags & 0x02) { /* cbreak */ termios->c_iflag = 0; termios->c_lflag &= ~ICANON; } if (flags & 0x08) { /* echo */ termios->c_lflag |= ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN; } if (flags & 0x10) { /* crmod */ termios->c_oflag |= OPOST | ONLCR; } if (flags & 0x20) { /* raw */ termios->c_iflag = 0; termios->c_lflag &= ~(ISIG | ICANON); } if (!(termios->c_lflag & ICANON)) { termios->c_cc[VMIN] = 1; termios->c_cc[VTIME] = 0; } } static int set_sgttyb(struct tty_struct * tty, struct sgttyb * sgttyb) { int retval; struct sgttyb tmp; struct termios termios; retval = verify_area(VERIFY_READ, sgttyb, sizeof(struct sgttyb)); if (retval) return retval; retval = tty_check_change(tty); if (retval) return retval; termios = *tty->termios; memcpy_fromfs(&tmp, sgttyb, sizeof(tmp)); termios.c_cc[VERASE] = tmp.sg_erase; termios.c_cc[VKILL] = tmp.sg_kill; set_sgflags(&termios, tmp.sg_flags); change_termios(tty, &termios); return 0; } #endif #ifdef TIOCGETC static int get_tchars(struct tty_struct * tty, struct tchars * tchars) { int retval; struct tchars tmp; retval = verify_area(VERIFY_WRITE, tchars, sizeof(struct tchars)); if (retval) return retval; tmp.t_intrc = tty->termios->c_cc[VINTR]; tmp.t_quitc = tty->termios->c_cc[VQUIT]; tmp.t_startc = tty->termios->c_cc[VSTART]; tmp.t_stopc = tty->termios->c_cc[VSTOP]; tmp.t_eofc = tty->termios->c_cc[VEOF]; tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */ memcpy_tofs(tchars, &tmp, sizeof(tmp)); return 0; } static int set_tchars(struct tty_struct * tty, struct tchars * tchars) { int retval; struct tchars tmp; retval = verify_area(VERIFY_READ, tchars, sizeof(struct tchars)); if (retval) return retval; memcpy_fromfs(&tmp, tchars, sizeof(tmp)); tty->termios->c_cc[VINTR] = tmp.t_intrc; tty->termios->c_cc[VQUIT] = tmp.t_quitc; tty->termios->c_cc[VSTART] = tmp.t_startc; tty->termios->c_cc[VSTOP] = tmp.t_stopc; tty->termios->c_cc[VEOF] = tmp.t_eofc; tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ return 0; } #endif #ifdef TIOCGLTC static int get_ltchars(struct tty_struct * tty, struct ltchars * ltchars) { int retval; struct ltchars tmp; retval = verify_area(VERIFY_WRITE, ltchars, sizeof(struct ltchars)); if (retval) return retval; tmp.t_suspc = tty->termios->c_cc[VSUSP]; tmp.t_dsuspc = tty->termios->c_cc[VSUSP]; /* what is dsuspc anyway? */ tmp.t_rprntc = tty->termios->c_cc[VREPRINT]; tmp.t_flushc = tty->termios->c_cc[VEOL2]; /* what is flushc anyway? */ tmp.t_werasc = tty->termios->c_cc[VWERASE]; tmp.t_lnextc = tty->termios->c_cc[VLNEXT]; memcpy_tofs(ltchars, &tmp, sizeof(tmp)); return 0; } static int set_ltchars(struct tty_struct * tty, struct ltchars * ltchars) { int retval; struct ltchars tmp; retval = verify_area(VERIFY_READ, ltchars, sizeof(struct ltchars)); if (retval) return retval; memcpy_fromfs(&tmp, ltchars, sizeof(tmp)); tty->termios->c_cc[VSUSP] = tmp.t_suspc; tty->termios->c_cc[VEOL2] = tmp.t_dsuspc; /* what is dsuspc anyway? */ tty->termios->c_cc[VREPRINT] = tmp.t_rprntc; tty->termios->c_cc[VEOL2] = tmp.t_flushc; /* what is flushc anyway? */ tty->termios->c_cc[VWERASE] = tmp.t_werasc; tty->termios->c_cc[VLNEXT] = tmp.t_lnextc; return 0; } #endif 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: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (struct termios)); if (retval) return retval; memcpy_tofs((struct termios *) arg, real_tty->termios, sizeof (struct termios)); return 0; case TCSETSF: return set_termios(real_tty, arg, TERMIOS_FLUSH); 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_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: stop_tty(tty); break; case TCOON: start_tty(tty); break; case TCIOFF: if (STOP_CHAR(tty) != __DISABLED_CHAR) tty->driver.write(tty, 0, &STOP_CHAR(tty), 1); break; case TCION: if (START_CHAR(tty) != __DISABLED_CHAR) tty->driver.write(tty, 0, &START_CHAR(tty), 1); 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: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (int)); if (retval) return retval; if (tty->driver.chars_in_buffer) put_user(tty->driver.chars_in_buffer(tty), (int *) arg); else put_user(0, (int *) 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(tty->read_cnt, (unsigned long *) arg); return 0; case TIOCGLCKTRMIOS: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (struct termios)); if (retval) return retval; memcpy_tofs((struct termios *) arg, real_tty->termios_locked, sizeof (struct termios)); return 0; case TIOCSLCKTRMIOS: if (!suser()) return -EPERM; retval = verify_area(VERIFY_READ, (void *) arg, sizeof (struct termios)); if (retval) return retval; memcpy_fromfs(real_tty->termios_locked, (struct termios *) arg, sizeof (struct termios)); return 0; case TIOCPKT: if (tty->driver.type != TTY_DRIVER_TYPE_PTY || tty->driver.subtype != PTY_TYPE_MASTER) return -ENOTTY; retval = verify_area(VERIFY_READ, (void *) arg, sizeof (int)); if (retval) return retval; if (get_user((int*)arg)) { if (!tty->packet) { tty->packet = 1; tty->link->ctrl_status = 0; } } else tty->packet = 0; return 0; /* These two ioctl's always return success; even if */ /* the driver doesn't support them. */ case TCSBRK: case TCSBRKP: retval = tty_check_change(tty); if (retval) return retval; tty_wait_until_sent(tty, 0); if (!tty->driver.ioctl) return 0; tty->driver.ioctl(tty, file, cmd, arg); return 0; default: return -ENOIOCTLCMD; } }
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