tty_ioctl.c
/* w tym pliku zdefiniowana jest  funkcja tty_ioctl dla dyscypliny
 * linii N_TTY - funkcja n_tty_ioctl */
/*
 *  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
 */
/* wewnetrzne flagi ustawienia struktury termios */
#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
   /* jeeli nie ma nic w buforze sterownika, to nic nie robi */
        if (!tty->driver.chars_in_buffer ||
            !tty->driver.chars_in_buffer(tty))
                return;
   /* proces sam wstawia si do kolejki czekajcych na pisanie do 
    * terminala */ 
        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();
   /* odczekuje odpowiedni ilo czasu (timeout) */
        } while (current->timeout);
   /* zmiana stanu na TASK_RUNNING i usunicie si z kolejki */
        current->state = TASK_RUNNING;
        remove_wait_queue(&tty->write_wait, &wait);
}

/* ustawienie flag i znakw sterujcych w termios tak jak byy ustawione
 * w old pod warunkiem, e termios_locked gwarantuje takie ustawienie */
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;
        }
   /* zmiana flag */
        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;
   /* zmiana znakw sterujcych */
        for (i=0; i < NCCS; i++)
                termios->c_cc[i] = locked->c_cc[i] ?
                        old->c_cc[i] : termios->c_cc[i];
}

/* zamienie struktur termios w tty_struct */
static void change_termios(struct tty_struct * tty, struct termios * new_termios)
{
        int canon_change;
        struct termios old_termios = *tty->termios;

   /* wyczenie przerwa */
        cli();
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E foc_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;
        }
}

/* wypenia struktur sgttyb znakami sterujcymi terminala */
static intset_sgttyb(struct tty_struct * tty, struct sgttyb * sgttyb)
{
        int retval;
        struct sgttyb tmp;
        struct termios termios;
   
   /* sprawdzenie obszaru */
        retval = verify_area(VERIFY_READ, sgttyb, sizeof(struct sgttyb));
        if (retval)
                return retval;
   /* wysya sygna SIGTTOU do procesu dla ktrego tty jest terminalem 
    * sterujcym */
        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
/* wypenienie struktury tchars znakami sterujcymi z terminala */
static int get_tchars(struct tty_struct * tty, struct tchars * tchars)
{
        int retval;
        struct tchars tmp;

   /* sprawdzenie obszaru */
        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;
}

/* ustawienie znakw sterujcych terminala tak, jak to okrelone w 
 * strukturze tchars */
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

/* wypenienie struktury ltchars znakamie ze struktury termios */
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;
}

/* ustawienie w strukturze termios znakw sterujcych tak jak w ltchars */
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

/* funkcja dyscypliny linii N_TTY; w interfejsie tty_ioctl */
int n_tty_ioctl(struct tty_struct * tty, struct file * file,
                       unsigned int cmd, unsigned long arg)
{
        struct tty_struct * real_tty;
        int retval;

   /* w przypadku wywoania tej funkcji dla czci nadrzdnej
    * pseudoterminala na real_tty podstawiana jest struktura opisujca
    * cz podrzdn */
        if (tty->driver.type == TTY_DRIVER_TYPE_PTY &&
            tty->driver.subtype == PTY_TYPE_MASTER)
                real_tty = tty->link;
        else
                real_tty = tty;

        switch (cmd) {
   /* zalenie od parametru cmd - polecenia */
#ifdef TIOCGETP
   /* komendy dotyczce pobrania albo ustawienia znakw sterujcych */
                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:
   /* pobranie na arg struktury termios */
                        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;
   /* pobranie lub ustawienie flag w strukturze termios */
                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:
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