665198b4c2
As a side effect, remove the clone style, as the normal device style supports device cloning now. Change-Id: Ie82d1ef0385514a04a8faa139129a617895780b5
640 lines
18 KiB
C
640 lines
18 KiB
C
/* pty.c - pseudo terminal driver Author: Kees J. Bot
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* 30 Dec 1995
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* PTYs can be seen as a bidirectional pipe with TTY
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* input and output processing. For example a simple rlogin session:
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*
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* keyboard -> rlogin -> in.rld -> /dev/ptypX -> /dev/ttypX -> shell
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* shell -> /dev/ttypX -> /dev/ptypX -> in.rld -> rlogin -> screen
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*
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* This file takes care of copying data between the tty/pty device pairs and
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* the open/read/write/close calls on the pty devices. The TTY task takes
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* care of the input and output processing (interrupt, backspace, raw I/O,
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* etc.) using the pty_slave_read() and pty_slave_write() functions as the
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* "keyboard" and "screen" functions of the ttypX devices.
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* Be careful when reading this code, the terms "reading" and "writing" are
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* used both for the tty (slave) and the pty (master) end of the pseudo tty.
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* Writes to one end are to be read at the other end and vice-versa.
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*/
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#include <minix/drivers.h>
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#include <termios.h>
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#include <signal.h>
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#include "tty.h"
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#if NR_PTYS > 0
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/* PTY bookkeeping structure, one per pty/tty pair. */
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typedef struct pty {
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tty_t *tty; /* associated TTY structure */
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char state; /* flags: busy, closed, ... */
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/* Read call on master (/dev/ptypX). */
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endpoint_t rdcaller; /* process making the call, or NONE if none */
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cdev_id_t rdid; /* ID of suspended read request */
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cp_grant_id_t rdgrant; /* grant for reader's address space */
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size_t rdleft; /* # bytes yet to be read */
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size_t rdcum; /* # bytes written so far */
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/* Write call to master (/dev/ptypX). */
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endpoint_t wrcaller; /* process making the call, or NONE if none*/
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cdev_id_t wrid; /* ID of suspended write request */
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cp_grant_id_t wrgrant; /* grant for writer's address space */
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size_t wrleft; /* # bytes yet to be written */
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size_t wrcum; /* # bytes written so far */
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/* Output buffer. */
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int ocount; /* # characters in the buffer */
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char *ohead, *otail; /* head and tail of the circular buffer */
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char obuf[2048]; /* buffer for bytes going to the pty reader */
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/* select() data. */
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unsigned int select_ops; /* Which operations do we want to know about? */
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endpoint_t select_proc; /* Who wants to know about it? */
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} pty_t;
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#define TTY_ACTIVE 0x01 /* tty is open/active */
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#define PTY_ACTIVE 0x02 /* pty is open/active */
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#define TTY_CLOSED 0x04 /* tty side has closed down */
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#define PTY_CLOSED 0x08 /* pty side has closed down */
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static pty_t pty_table[NR_PTYS]; /* PTY bookkeeping */
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static void pty_start(pty_t *pp);
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static void pty_finish(pty_t *pp);
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static int pty_master_open(devminor_t minor, int access,
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endpoint_t user_endpt);
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static int pty_master_close(devminor_t minor);
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static ssize_t pty_master_read(devminor_t minor, u64_t position,
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endpoint_t endpt, cp_grant_id_t grant, size_t size, int flags,
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cdev_id_t id);
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static ssize_t pty_master_write(devminor_t minor, u64_t position,
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endpoint_t endpt, cp_grant_id_t grant, size_t size, int flags,
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cdev_id_t id);
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static int pty_master_cancel(devminor_t minor, endpoint_t endpt, cdev_id_t id);
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static int pty_master_select(devminor_t minor, unsigned int ops,
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endpoint_t endpt);
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static struct chardriver pty_master_tab = {
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.cdr_open = pty_master_open,
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.cdr_close = pty_master_close,
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.cdr_read = pty_master_read,
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.cdr_write = pty_master_write,
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.cdr_cancel = pty_master_cancel,
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.cdr_select = pty_master_select
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};
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/*===========================================================================*
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* pty_master_open *
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*===========================================================================*/
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static int pty_master_open(devminor_t minor, int UNUSED(access),
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endpoint_t UNUSED(user_endpt))
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{
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tty_t *tp;
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pty_t *pp;
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if ((tp = line2tty(minor)) == NULL)
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return ENXIO;
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pp = tp->tty_priv;
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if (pp->state & PTY_ACTIVE)
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return EIO;
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pp->state |= PTY_ACTIVE;
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pp->rdcum = 0;
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pp->wrcum = 0;
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return OK;
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}
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/*===========================================================================*
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* pty_master_close *
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*===========================================================================*/
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static int pty_master_close(devminor_t minor)
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{
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tty_t *tp;
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pty_t *pp;
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if ((tp = line2tty(minor)) == NULL)
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return ENXIO;
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pp = tp->tty_priv;
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if ((pp->state & (TTY_ACTIVE | TTY_CLOSED)) != TTY_ACTIVE) {
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pp->state = 0;
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} else {
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pp->state |= PTY_CLOSED;
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sigchar(tp, SIGHUP, 1);
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}
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return OK;
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}
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/*===========================================================================*
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* pty_master_read *
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*===========================================================================*/
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static ssize_t pty_master_read(devminor_t minor, u64_t UNUSED(position),
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endpoint_t endpt, cp_grant_id_t grant, size_t size, int flags,
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cdev_id_t id)
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{
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tty_t *tp;
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pty_t *pp;
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ssize_t r;
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if ((tp = line2tty(minor)) == NULL)
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return ENXIO;
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pp = tp->tty_priv;
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/* Check, store information on the reader, do I/O. */
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if (pp->state & TTY_CLOSED)
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return 0; /* EOF */
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if (pp->rdcaller != NONE || pp->rdleft != 0 || pp->rdcum != 0)
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return EIO;
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if (size <= 0)
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return EINVAL;
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pp->rdcaller = endpt;
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pp->rdid = id;
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pp->rdgrant = grant;
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pp->rdleft = size;
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pty_start(pp);
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handle_events(tp);
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if (pp->rdleft == 0) {
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pp->rdcaller = NONE;
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return EDONTREPLY; /* already done */
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}
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if (flags & CDEV_NONBLOCK) {
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r = pp->rdcum > 0 ? pp->rdcum : EAGAIN;
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pp->rdleft = pp->rdcum = 0;
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pp->rdcaller = NONE;
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return r;
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}
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return EDONTREPLY; /* do suspend */
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}
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/*===========================================================================*
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* pty_master_write *
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*===========================================================================*/
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static ssize_t pty_master_write(devminor_t minor, u64_t UNUSED(position),
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endpoint_t endpt, cp_grant_id_t grant, size_t size, int flags,
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cdev_id_t id)
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{
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tty_t *tp;
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pty_t *pp;
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ssize_t r;
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if ((tp = line2tty(minor)) == NULL)
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return ENXIO;
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pp = tp->tty_priv;
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/* Check, store information on the writer, do I/O. */
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if (pp->state & TTY_CLOSED)
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return EIO;
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if (pp->wrcaller != NONE || pp->wrleft != 0 || pp->wrcum != 0)
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return EIO;
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if (size <= 0)
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return EINVAL;
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pp->wrcaller = endpt;
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pp->wrid = id;
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pp->wrgrant = grant;
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pp->wrleft = size;
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handle_events(tp);
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if (pp->wrleft == 0) {
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pp->wrcaller = NONE;
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return EDONTREPLY; /* already done */
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}
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if (flags & CDEV_NONBLOCK) {
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r = pp->wrcum > 0 ? pp->wrcum : EAGAIN;
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pp->wrleft = pp->wrcum = 0;
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pp->wrcaller = NONE;
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return r;
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}
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return EDONTREPLY; /* do suspend */
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}
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/*===========================================================================*
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* pty_master_cancel *
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*===========================================================================*/
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static int pty_master_cancel(devminor_t minor, endpoint_t endpt, cdev_id_t id)
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{
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tty_t *tp;
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pty_t *pp;
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int r;
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if ((tp = line2tty(minor)) == NULL)
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return ENXIO;
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pp = tp->tty_priv;
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if (pp->rdcaller == endpt && pp->rdid == id) {
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/* Cancel a read from a PTY. */
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r = pp->rdcum > 0 ? pp->rdcum : EINTR;
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pp->rdleft = pp->rdcum = 0;
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pp->rdcaller = NONE;
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return r;
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}
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if (pp->wrcaller == endpt && pp->wrid == id) {
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/* Cancel a write to a PTY. */
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r = pp->wrcum > 0 ? pp->wrcum : EINTR;
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pp->wrleft = pp->wrcum = 0;
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pp->wrcaller = NONE;
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return r;
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}
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/* Request not found. */
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return EDONTREPLY;
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}
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/*===========================================================================*
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* select_try_pty *
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*===========================================================================*/
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static int select_try_pty(tty_t *tp, int ops)
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{
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pty_t *pp = tp->tty_priv;
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int r = 0;
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if (ops & CDEV_OP_WR) {
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/* Write won't block on error. */
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if (pp->state & TTY_CLOSED) r |= CDEV_OP_WR;
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else if (pp->wrleft != 0 || pp->wrcum != 0) r |= CDEV_OP_WR;
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else if (tp->tty_inleft > 0) r |= CDEV_OP_WR; /* There's a reader. */
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}
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if (ops & CDEV_OP_RD) {
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/* Read won't block on error. */
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if (pp->state & TTY_CLOSED) r |= CDEV_OP_RD;
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else if (pp->rdleft != 0 || pp->rdcum != 0) r |= CDEV_OP_RD;
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else if (pp->ocount > 0) r |= CDEV_OP_RD; /* Actual data. */
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}
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return r;
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}
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/*===========================================================================*
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* select_retry_pty *
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*===========================================================================*/
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void select_retry_pty(tty_t *tp)
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{
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pty_t *pp = tp->tty_priv;
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devminor_t minor;
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int r;
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/* See if the pty side of a pty is ready to return a select. */
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if (pp->select_ops && (r = select_try_pty(tp, pp->select_ops))) {
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minor = PTYPX_MINOR + (int) (pp - pty_table);
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chardriver_reply_select(pp->select_proc, minor, r);
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pp->select_ops &= ~r;
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}
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}
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/*===========================================================================*
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* pty_master_select *
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*===========================================================================*/
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static int pty_master_select(devminor_t minor, unsigned int ops,
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endpoint_t endpt)
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{
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tty_t *tp;
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pty_t *pp;
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int ready_ops, watch;
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if ((tp = line2tty(minor)) == NULL)
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return ENXIO;
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pp = tp->tty_priv;
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watch = (ops & CDEV_NOTIFY);
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ops &= (CDEV_OP_RD | CDEV_OP_WR | CDEV_OP_ERR);
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ready_ops = select_try_pty(tp, ops);
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ops &= ~ready_ops;
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if (ops && watch) {
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pp->select_ops |= ops;
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pp->select_proc = endpt;
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}
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return ready_ops;
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}
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/*===========================================================================*
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* do_pty *
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*===========================================================================*/
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void do_pty(message *m_ptr, int ipc_status)
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{
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/* Process a request for a PTY master (/dev/ptypX) device. */
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chardriver_process(&pty_master_tab, m_ptr, ipc_status);
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}
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/*===========================================================================*
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* pty_slave_write *
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*===========================================================================*/
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static int pty_slave_write(tty_t *tp, int try)
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{
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/* (*dev_write)() routine for PTYs. Transfer bytes from the writer on
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* /dev/ttypX to the output buffer.
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*/
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pty_t *pp = tp->tty_priv;
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int count, ocount, s;
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/* PTY closed down? */
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if (pp->state & PTY_CLOSED) {
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if (try) return 1;
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if (tp->tty_outleft > 0) {
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chardriver_reply_task(tp->tty_outcaller, tp->tty_outid, EIO);
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tp->tty_outleft = tp->tty_outcum = 0;
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tp->tty_outcaller = NONE;
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}
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return 0;
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}
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/* While there is something to do. */
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for (;;) {
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ocount = buflen(pp->obuf) - pp->ocount;
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if (try) return (ocount > 0);
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count = bufend(pp->obuf) - pp->ohead;
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if (count > ocount) count = ocount;
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if (count > tp->tty_outleft) count = tp->tty_outleft;
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if (count == 0 || tp->tty_inhibited)
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break;
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/* Copy from user space to the PTY output buffer. */
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if (tp->tty_outcaller == KERNEL) {
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/* We're trying to print on kernel's behalf */
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memcpy(pp->ohead, (void *) tp->tty_outgrant + tp->tty_outcum,
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count);
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} else {
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if ((s = sys_safecopyfrom(tp->tty_outcaller, tp->tty_outgrant,
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tp->tty_outcum, (vir_bytes) pp->ohead,
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count)) != OK) {
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break;
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}
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}
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/* Perform output processing on the output buffer. */
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out_process(tp, pp->obuf, pp->ohead, bufend(pp->obuf), &count, &ocount);
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if (count == 0) break;
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/* Assume echoing messed up by output. */
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tp->tty_reprint = TRUE;
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/* Bookkeeping. */
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pp->ocount += ocount;
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if ((pp->ohead += ocount) >= bufend(pp->obuf))
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pp->ohead -= buflen(pp->obuf);
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pty_start(pp);
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tp->tty_outcum += count;
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if ((tp->tty_outleft -= count) == 0) {
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/* Output is finished, reply to the writer. */
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chardriver_reply_task(tp->tty_outcaller, tp->tty_outid,
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tp->tty_outcum);
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tp->tty_outcum = 0;
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tp->tty_outcaller = NONE;
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}
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}
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pty_finish(pp);
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return 1;
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}
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/*===========================================================================*
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* pty_slave_echo *
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*===========================================================================*/
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static void pty_slave_echo(tty_t *tp, int c)
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{
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/* Echo one character. (Like pty_write, but only one character, optionally.) */
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pty_t *pp = tp->tty_priv;
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int count, ocount;
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ocount = buflen(pp->obuf) - pp->ocount;
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if (ocount == 0) return; /* output buffer full */
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count = 1;
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*pp->ohead = c; /* add one character */
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out_process(tp, pp->obuf, pp->ohead, bufend(pp->obuf), &count, &ocount);
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if (count == 0) return;
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pp->ocount += ocount;
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if ((pp->ohead += ocount) >= bufend(pp->obuf)) pp->ohead -= buflen(pp->obuf);
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pty_start(pp);
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}
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/*===========================================================================*
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* pty_start *
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*===========================================================================*/
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static void pty_start(pty_t *pp)
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{
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/* Transfer bytes written to the output buffer to the PTY reader. */
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int count;
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/* While there are things to do. */
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for (;;) {
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int s;
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count = bufend(pp->obuf) - pp->otail;
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if (count > pp->ocount) count = pp->ocount;
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if (count > pp->rdleft) count = pp->rdleft;
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if (count == 0) break;
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/* Copy from the output buffer to the readers address space. */
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if((s = sys_safecopyto(pp->rdcaller, pp->rdgrant, pp->rdcum,
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(vir_bytes) pp->otail, count)) != OK) {
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break;
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}
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/* Bookkeeping. */
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pp->ocount -= count;
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if ((pp->otail += count) == bufend(pp->obuf)) pp->otail = pp->obuf;
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pp->rdcum += count;
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pp->rdleft -= count;
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}
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}
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/*===========================================================================*
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* pty_finish *
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*===========================================================================*/
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static void pty_finish(pty_t *pp)
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{
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/* Finish the read request of a PTY reader if there is at least one byte
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* transferred.
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*/
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if (pp->rdcum > 0) {
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chardriver_reply_task(pp->rdcaller, pp->rdid, pp->rdcum);
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pp->rdleft = pp->rdcum = 0;
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pp->rdcaller = NONE;
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}
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}
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/*===========================================================================*
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* pty_slave_read *
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*===========================================================================*/
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static int pty_slave_read(tty_t *tp, int try)
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{
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/* Offer bytes from the PTY writer for input on the TTY. (Do it one byte at
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* a time, 99% of the writes will be for one byte, so no sense in being smart.)
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*/
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pty_t *pp = tp->tty_priv;
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char c;
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if (pp->state & PTY_CLOSED) {
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if (try) return 1;
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if (tp->tty_inleft > 0) {
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chardriver_reply_task(tp->tty_incaller, tp->tty_inid,
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tp->tty_incum);
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tp->tty_inleft = tp->tty_incum = 0;
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tp->tty_incaller = NONE;
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}
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return 1;
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}
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|
if (try) {
|
|
if (pp->wrleft > 0)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
while (pp->wrleft > 0) {
|
|
int s;
|
|
|
|
/* Transfer one character to 'c'. */
|
|
if ((s = sys_safecopyfrom(pp->wrcaller, pp->wrgrant, pp->wrcum,
|
|
(vir_bytes) &c, 1)) != OK) {
|
|
printf("pty: safecopy failed (error %d)\n", s);
|
|
break;
|
|
}
|
|
|
|
/* Input processing. */
|
|
if (in_process(tp, &c, 1, -1) == 0) break;
|
|
|
|
/* PTY writer bookkeeping. */
|
|
pp->wrcum++;
|
|
if (--pp->wrleft == 0) {
|
|
chardriver_reply_task(pp->wrcaller, pp->wrid, pp->wrcum);
|
|
pp->wrcum = 0;
|
|
pp->wrcaller = NONE;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* pty_slave_open *
|
|
*===========================================================================*/
|
|
static int pty_slave_open(tty_t *tp, int UNUSED(try))
|
|
{
|
|
/* The tty side has been opened. */
|
|
pty_t *pp = tp->tty_priv;
|
|
|
|
/* TTY_ACTIVE may already be set, which would indicate that the slave is
|
|
* reopened after being fully closed while the master is still open. In that
|
|
* case TTY_CLOSED will also be set, so clear that one.
|
|
*/
|
|
pp->state |= TTY_ACTIVE;
|
|
pp->state &= ~TTY_CLOSED;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* pty_slave_close *
|
|
*===========================================================================*/
|
|
static int pty_slave_close(tty_t *tp, int UNUSED(try))
|
|
{
|
|
/* The tty side has closed, so shut down the pty side. */
|
|
pty_t *pp = tp->tty_priv;
|
|
|
|
if (!(pp->state & PTY_ACTIVE)) return 0;
|
|
|
|
if (pp->rdleft > 0) {
|
|
chardriver_reply_task(pp->rdcaller, pp->rdid, pp->rdcum);
|
|
pp->rdleft = pp->rdcum = 0;
|
|
pp->rdcaller = NONE;
|
|
}
|
|
|
|
if (pp->wrleft > 0) {
|
|
chardriver_reply_task(pp->wrcaller, pp->wrid, pp->wrcum);
|
|
pp->wrleft = pp->wrcum = 0;
|
|
pp->wrcaller = NONE;
|
|
}
|
|
|
|
if (pp->state & PTY_CLOSED) pp->state = 0;
|
|
else pp->state |= TTY_CLOSED;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* pty_slave_icancel *
|
|
*===========================================================================*/
|
|
static int pty_slave_icancel(tty_t *tp, int UNUSED(try))
|
|
{
|
|
/* Discard waiting input. */
|
|
pty_t *pp = tp->tty_priv;
|
|
|
|
if (pp->wrleft > 0) {
|
|
chardriver_reply_task(pp->wrcaller, pp->wrid, pp->wrcum + pp->wrleft);
|
|
pp->wrcum = pp->wrleft = 0;
|
|
pp->wrcaller = NONE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* pty_slave_ocancel *
|
|
*===========================================================================*/
|
|
static int pty_slave_ocancel(tty_t *tp, int UNUSED(try))
|
|
{
|
|
/* Drain the output buffer. */
|
|
pty_t *pp = tp->tty_priv;
|
|
|
|
pp->ocount = 0;
|
|
pp->otail = pp->ohead;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* pty_init *
|
|
*===========================================================================*/
|
|
void pty_init(tty_t *tp)
|
|
{
|
|
pty_t *pp;
|
|
int line;
|
|
|
|
/* Associate PTY and TTY structures. */
|
|
line = tp - &tty_table[NR_CONS + NR_RS_LINES];
|
|
pp = tp->tty_priv = &pty_table[line];
|
|
pp->tty = tp;
|
|
pp->select_ops = 0;
|
|
pp->rdcaller = NONE;
|
|
pp->wrcaller = NONE;
|
|
|
|
/* Set up output queue. */
|
|
pp->ohead = pp->otail = pp->obuf;
|
|
|
|
/* Fill in TTY function hooks. */
|
|
tp->tty_devread = pty_slave_read;
|
|
tp->tty_devwrite = pty_slave_write;
|
|
tp->tty_echo = pty_slave_echo;
|
|
tp->tty_icancel = pty_slave_icancel;
|
|
tp->tty_ocancel = pty_slave_ocancel;
|
|
tp->tty_open = pty_slave_open;
|
|
tp->tty_close = pty_slave_close;
|
|
tp->tty_select_ops = 0;
|
|
}
|
|
|
|
#endif /* NR_PTYS > 0 */
|