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350 lines
7.5 KiB
350 lines
7.5 KiB
3 years ago
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/*
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* linux/kernel/tty_io.c
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*
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* (C) 1991 Linus Torvalds
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*/
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/*
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* 'tty_io.c' gives an orthogonal feeling to tty's, be they consoles
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* or rs-channels. It also implements echoing, cooked mode etc.
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*
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* Kill-line thanks to John T Kohl.
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <signal.h>
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#define ALRMMASK (1<<(SIGALRM-1))
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#define KILLMASK (1<<(SIGKILL-1))
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#define INTMASK (1<<(SIGINT-1))
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#define QUITMASK (1<<(SIGQUIT-1))
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#define TSTPMASK (1<<(SIGTSTP-1))
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#include <linux/sched.h>
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#include <linux/tty.h>
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#include <asm/segment.h>
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#include <asm/system.h>
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#define _L_FLAG(tty,f) ((tty)->termios.c_lflag & f)
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#define _I_FLAG(tty,f) ((tty)->termios.c_iflag & f)
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#define _O_FLAG(tty,f) ((tty)->termios.c_oflag & f)
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#define L_CANON(tty) _L_FLAG((tty),ICANON)
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#define L_ISIG(tty) _L_FLAG((tty),ISIG)
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#define L_ECHO(tty) _L_FLAG((tty),ECHO)
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#define L_ECHOE(tty) _L_FLAG((tty),ECHOE)
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#define L_ECHOK(tty) _L_FLAG((tty),ECHOK)
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#define L_ECHOCTL(tty) _L_FLAG((tty),ECHOCTL)
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#define L_ECHOKE(tty) _L_FLAG((tty),ECHOKE)
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#define I_UCLC(tty) _I_FLAG((tty),IUCLC)
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#define I_NLCR(tty) _I_FLAG((tty),INLCR)
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#define I_CRNL(tty) _I_FLAG((tty),ICRNL)
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#define I_NOCR(tty) _I_FLAG((tty),IGNCR)
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#define O_POST(tty) _O_FLAG((tty),OPOST)
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#define O_NLCR(tty) _O_FLAG((tty),ONLCR)
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#define O_CRNL(tty) _O_FLAG((tty),OCRNL)
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#define O_NLRET(tty) _O_FLAG((tty),ONLRET)
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#define O_LCUC(tty) _O_FLAG((tty),OLCUC)
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struct tty_struct tty_table[] = {
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{
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{ICRNL, /* change incoming CR to NL */
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OPOST|ONLCR, /* change outgoing NL to CRNL */
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0,
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ISIG | ICANON | ECHO | ECHOCTL | ECHOKE,
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0, /* console termio */
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INIT_C_CC},
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0, /* initial pgrp */
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0, /* initial stopped */
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con_write,
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{0,0,0,0,""}, /* console read-queue */
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{0,0,0,0,""}, /* console write-queue */
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{0,0,0,0,""} /* console secondary queue */
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},{
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{0, /* no translation */
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0, /* no translation */
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B2400 | CS8,
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0,
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0,
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INIT_C_CC},
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0,
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0,
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rs_write,
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{0x3f8,0,0,0,""}, /* rs 1 */
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{0x3f8,0,0,0,""},
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{0,0,0,0,""}
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},{
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{0, /* no translation */
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0, /* no translation */
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B2400 | CS8,
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0,
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0,
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INIT_C_CC},
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0,
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0,
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rs_write,
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{0x2f8,0,0,0,""}, /* rs 2 */
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{0x2f8,0,0,0,""},
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{0,0,0,0,""}
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}
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};
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/*
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* these are the tables used by the machine code handlers.
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* you can implement pseudo-tty's or something by changing
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* them. Currently not done.
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*/
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struct tty_queue * table_list[]={
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&tty_table[0].read_q, &tty_table[0].write_q,
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&tty_table[1].read_q, &tty_table[1].write_q,
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&tty_table[2].read_q, &tty_table[2].write_q
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};
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void tty_init(void)
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{
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rs_init();
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con_init();
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}
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void tty_intr(struct tty_struct * tty, int mask)
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{
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int i;
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if (tty->pgrp <= 0)
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return;
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for (i=0;i<NR_TASKS;i++)
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if (task[i] && task[i]->pgrp==tty->pgrp)
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task[i]->signal |= mask;
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}
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static void sleep_if_empty(struct tty_queue * queue)
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{
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cli();
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while (!current->signal && EMPTY(*queue))
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interruptible_sleep_on(&queue->proc_list);
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sti();
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}
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static void sleep_if_full(struct tty_queue * queue)
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{
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if (!FULL(*queue))
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return;
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cli();
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while (!current->signal && LEFT(*queue)<128)
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interruptible_sleep_on(&queue->proc_list);
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sti();
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}
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void wait_for_keypress(void)
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{
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sleep_if_empty(&tty_table[0].secondary);
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}
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void copy_to_cooked(struct tty_struct * tty)
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{
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signed char c;
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while (!EMPTY(tty->read_q) && !FULL(tty->secondary)) {
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GETCH(tty->read_q,c);
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if (c==13)
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if (I_CRNL(tty))
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c=10;
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else if (I_NOCR(tty))
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continue;
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else ;
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else if (c==10 && I_NLCR(tty))
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c=13;
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if (I_UCLC(tty))
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c=tolower(c);
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if (L_CANON(tty)) {
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if (c==KILL_CHAR(tty)) {
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/* deal with killing the input line */
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while(!(EMPTY(tty->secondary) ||
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(c=LAST(tty->secondary))==10 ||
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c==EOF_CHAR(tty))) {
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if (L_ECHO(tty)) {
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if (c<32)
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PUTCH(127,tty->write_q);
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PUTCH(127,tty->write_q);
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tty->write(tty);
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}
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DEC(tty->secondary.head);
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}
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continue;
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}
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if (c==ERASE_CHAR(tty)) {
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if (EMPTY(tty->secondary) ||
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(c=LAST(tty->secondary))==10 ||
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c==EOF_CHAR(tty))
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continue;
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if (L_ECHO(tty)) {
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if (c<32)
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PUTCH(127,tty->write_q);
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PUTCH(127,tty->write_q);
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tty->write(tty);
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}
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DEC(tty->secondary.head);
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continue;
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}
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if (c==STOP_CHAR(tty)) {
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tty->stopped=1;
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continue;
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}
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if (c==START_CHAR(tty)) {
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tty->stopped=0;
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continue;
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}
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}
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if (L_ISIG(tty)) {
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if (c==INTR_CHAR(tty)) {
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tty_intr(tty,INTMASK);
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continue;
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}
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if (c==QUIT_CHAR(tty)) {
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tty_intr(tty,QUITMASK);
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continue;
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}
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}
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if (c==10 || c==EOF_CHAR(tty))
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tty->secondary.data++;
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if (L_ECHO(tty)) {
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if (c==10) {
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PUTCH(10,tty->write_q);
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PUTCH(13,tty->write_q);
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} else if (c<32) {
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if (L_ECHOCTL(tty)) {
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PUTCH('^',tty->write_q);
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PUTCH(c+64,tty->write_q);
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}
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} else
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PUTCH(c,tty->write_q);
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tty->write(tty);
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}
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PUTCH(c,tty->secondary);
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}
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wake_up(&tty->secondary.proc_list);
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}
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int tty_read(unsigned channel, char * buf, int nr)
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{
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struct tty_struct * tty;
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char c, * b=buf;
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int minimum,time,flag=0;
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long oldalarm;
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if (channel>2 || nr<0) return -1;
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tty = &tty_table[channel];
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oldalarm = current->alarm;
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time = 10L*tty->termios.c_cc[VTIME];
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minimum = tty->termios.c_cc[VMIN];
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if (time && !minimum) {
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minimum=1;
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if (flag=(!oldalarm || time+jiffies<oldalarm))
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current->alarm = time+jiffies;
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}
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if (minimum>nr)
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minimum=nr;
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while (nr>0) {
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if (flag && (current->signal & ALRMMASK)) {
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current->signal &= ~ALRMMASK;
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break;
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}
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if (current->signal)
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break;
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if (EMPTY(tty->secondary) || (L_CANON(tty) &&
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!tty->secondary.data && LEFT(tty->secondary)>20)) {
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sleep_if_empty(&tty->secondary);
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continue;
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}
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do {
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GETCH(tty->secondary,c);
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if (c==EOF_CHAR(tty) || c==10)
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tty->secondary.data--;
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if (c==EOF_CHAR(tty) && L_CANON(tty))
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return (b-buf);
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else {
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put_fs_byte(c,b++);
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if (!--nr)
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break;
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}
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} while (nr>0 && !EMPTY(tty->secondary));
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if (time && !L_CANON(tty))
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if (flag=(!oldalarm || time+jiffies<oldalarm))
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current->alarm = time+jiffies;
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else
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current->alarm = oldalarm;
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if (L_CANON(tty)) {
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if (b-buf)
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break;
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} else if (b-buf >= minimum)
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break;
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}
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current->alarm = oldalarm;
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if (current->signal && !(b-buf))
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return -EINTR;
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return (b-buf);
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}
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int tty_write(unsigned channel, char * buf, int nr)
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{
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static cr_flag=0;
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struct tty_struct * tty;
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char c, *b=buf;
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if (channel>2 || nr<0) return -1;
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tty = channel + tty_table;
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while (nr>0) {
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sleep_if_full(&tty->write_q);
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if (current->signal)
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break;
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while (nr>0 && !FULL(tty->write_q)) {
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c=get_fs_byte(b);
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if (O_POST(tty)) {
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if (c=='\r' && O_CRNL(tty))
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c='\n';
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else if (c=='\n' && O_NLRET(tty))
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c='\r';
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if (c=='\n' && !cr_flag && O_NLCR(tty)) {
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cr_flag = 1;
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PUTCH(13,tty->write_q);
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continue;
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}
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if (O_LCUC(tty))
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c=toupper(c);
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}
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b++; nr--;
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cr_flag = 0;
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PUTCH(c,tty->write_q);
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}
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tty->write(tty);
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if (nr>0)
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schedule();
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}
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return (b-buf);
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}
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/*
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* Jeh, sometimes I really like the 386.
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* This routine is called from an interrupt,
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* and there should be absolutely no problem
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* with sleeping even in an interrupt (I hope).
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* Of course, if somebody proves me wrong, I'll
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* hate intel for all time :-). We'll have to
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* be careful and see to reinstating the interrupt
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* chips before calling this, though.
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*
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* I don't think we sleep here under normal circumstances
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* anyway, which is good, as the task sleeping might be
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* totally innocent.
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*/
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void do_tty_interrupt(int tty)
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{
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copy_to_cooked(tty_table+tty);
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}
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void chr_dev_init(void)
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{
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}
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