bf8e8a6e8f
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.
2700 lines
63 KiB
C
2700 lines
63 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1990, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Copyright (c) 2002 Networks Associates Technologies, Inc.
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* All rights reserved.
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*
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* Portions of this software were developed for the FreeBSD Project by
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* ThinkSec AS and NAI Labs, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tty.c 8.8 (Berkeley) 1/21/94
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* $FreeBSD$
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*/
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/*-
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* TODO:
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* o Fix races for sending the start char in ttyflush().
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* o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
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* With luck, there will be MIN chars before select() returns().
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* o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
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* o Don't allow input in TS_ZOMBIE case. It would be visible through
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* FIONREAD.
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* o Do the new sio locking stuff here and use it to avoid special
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* case for EXTPROC?
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* o Lock PENDIN too?
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* o Move EXTPROC and/or PENDIN to t_state?
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* o Wrap most of ttioctl in spltty/splx.
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* o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
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* o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
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* o Don't allow certain termios flags to affect disciplines other
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* than TTYDISC. Cancel their effects before switch disciplines
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* and ignore them if they are set while we are in another
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* discipline.
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* o Now that historical speed conversions are handled here, don't
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* do them in drivers.
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* o Check for TS_CARR_ON being set while everything is closed and not
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* waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
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* so it would live until the next open even if carrier drops.
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* o Restore TS_WOPEN since it is useful in pstat. It must be cleared
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* only when _all_ openers leave open().
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*/
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/filio.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/sx.h>
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#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
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#include <sys/ioctl_compat.h>
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#endif
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#include <sys/proc.h>
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#define TTYDEFCHARS
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#include <sys/tty.h>
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#undef TTYDEFCHARS
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#include <sys/fcntl.h>
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#include <sys/conf.h>
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#include <sys/dkstat.h>
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#include <sys/poll.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/signalvar.h>
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#include <sys/resourcevar.h>
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#include <sys/malloc.h>
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#include <sys/filedesc.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
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static int proc_compare(struct proc *p1, struct proc *p2);
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static int ttnread(struct tty *tp);
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static void ttyecho(int c, struct tty *tp);
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static int ttyoutput(int c, struct tty *tp);
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static void ttypend(struct tty *tp);
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static void ttyretype(struct tty *tp);
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static void ttyrub(int c, struct tty *tp);
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static void ttyrubo(struct tty *tp, int cnt);
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static void ttyunblock(struct tty *tp);
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static int ttywflush(struct tty *tp);
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static int filt_ttyread(struct knote *kn, long hint);
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static void filt_ttyrdetach(struct knote *kn);
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static int filt_ttywrite(struct knote *kn, long hint);
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static void filt_ttywdetach(struct knote *kn);
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/*
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* Table with character classes and parity. The 8th bit indicates parity,
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* the 7th bit indicates the character is an alphameric or underscore (for
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* ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
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* are 0 then the character needs no special processing on output; classes
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* other than 0 might be translated or (not currently) require delays.
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*/
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#define E 0x00 /* Even parity. */
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#define O 0x80 /* Odd parity. */
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#define PARITY(c) (char_type[c] & O)
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#define ALPHA 0x40 /* Alpha or underscore. */
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#define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
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#define CCLASSMASK 0x3f
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#define CCLASS(c) (char_type[c] & CCLASSMASK)
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#define BS BACKSPACE
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#define CC CONTROL
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#define CR RETURN
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#define NA ORDINARY | ALPHA
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#define NL NEWLINE
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#define NO ORDINARY
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#define TB TAB
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#define VT VTAB
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static u_char const char_type[] = {
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E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
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O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
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O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
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E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
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O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
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E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
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E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
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O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
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O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
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E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
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E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
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O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
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E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
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O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
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O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
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E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
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/*
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* Meta chars; should be settable per character set;
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* for now, treat them all as normal characters.
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*/
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA,
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};
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#undef BS
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#undef CC
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#undef CR
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#undef NA
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#undef NL
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#undef NO
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#undef TB
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#undef VT
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/* Macros to clear/set/test flags. */
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#define SET(t, f) (t) |= (f)
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#define CLR(t, f) (t) &= ~(f)
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#define ISSET(t, f) ((t) & (f))
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#undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
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#define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
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/*
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* list of struct tty where pstat(8) can pick it up with sysctl
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*/
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static SLIST_HEAD(, tty) tty_list;
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static int drainwait = 5*60;
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SYSCTL_INT(_kern, OID_AUTO, drainwait, CTLFLAG_RW, &drainwait,
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0, "Output drain timeout in seconds");
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/*
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* Initial open of tty, or (re)entry to standard tty line discipline.
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*/
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int
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ttyopen(dev_t device, struct tty *tp)
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{
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int s;
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s = spltty();
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tp->t_dev = device;
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if (!ISSET(tp->t_state, TS_ISOPEN)) {
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SET(tp->t_state, TS_ISOPEN);
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if (ISSET(tp->t_cflag, CLOCAL))
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SET(tp->t_state, TS_CONNECTED);
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bzero(&tp->t_winsize, sizeof(tp->t_winsize));
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}
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/* XXX don't hang forever on output */
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if (tp->t_timeout < 0)
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tp->t_timeout = drainwait*hz;
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ttsetwater(tp);
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splx(s);
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return (0);
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}
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/*
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* Handle close() on a tty line: flush and set to initial state,
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* bumping generation number so that pending read/write calls
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* can detect recycling of the tty.
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* XXX our caller should have done `spltty(); l_close(); ttyclose();'
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* and l_close() should have flushed, but we repeat the spltty() and
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* the flush in case there are buggy callers.
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*/
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int
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ttyclose(struct tty *tp)
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{
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int s;
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funsetown(&tp->t_sigio);
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s = spltty();
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if (constty == tp)
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constty = NULL;
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ttyflush(tp, FREAD | FWRITE);
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clist_free_cblocks(&tp->t_canq);
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clist_free_cblocks(&tp->t_outq);
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clist_free_cblocks(&tp->t_rawq);
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tp->t_gen++;
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tp->t_line = TTYDISC;
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tp->t_pgrp = NULL;
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tp->t_session = NULL;
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tp->t_state = 0;
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splx(s);
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return (0);
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}
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#define FLUSHQ(q) { \
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if ((q)->c_cc) \
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ndflush(q, (q)->c_cc); \
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}
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/* Is 'c' a line delimiter ("break" character)? */
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#define TTBREAKC(c, lflag) \
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((c) == '\n' || (((c) == cc[VEOF] || \
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(c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
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(c) != _POSIX_VDISABLE))
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/*
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* Process input of a single character received on a tty.
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*/
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int
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ttyinput(int c, struct tty *tp)
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{
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tcflag_t iflag, lflag;
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cc_t *cc;
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int i, err;
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/*
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* If input is pending take it first.
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*/
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lflag = tp->t_lflag;
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if (ISSET(lflag, PENDIN))
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ttypend(tp);
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/*
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* Gather stats.
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*/
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if (ISSET(lflag, ICANON)) {
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++tk_cancc;
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++tp->t_cancc;
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} else {
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++tk_rawcc;
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++tp->t_rawcc;
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}
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++tk_nin;
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|
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/*
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* Block further input iff:
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* current input > threshold AND input is available to user program
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* AND input flow control is enabled and not yet invoked.
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* The 3 is slop for PARMRK.
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*/
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iflag = tp->t_iflag;
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if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
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(!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
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(ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
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!ISSET(tp->t_state, TS_TBLOCK))
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ttyblock(tp);
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|
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/* Handle exceptional conditions (break, parity, framing). */
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cc = tp->t_cc;
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err = (ISSET(c, TTY_ERRORMASK));
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if (err) {
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CLR(c, TTY_ERRORMASK);
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if (ISSET(err, TTY_BI)) {
|
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if (ISSET(iflag, IGNBRK))
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return (0);
|
|
if (ISSET(iflag, BRKINT)) {
|
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ttyflush(tp, FREAD | FWRITE);
|
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if (tp->t_pgrp != NULL) {
|
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PGRP_LOCK(tp->t_pgrp);
|
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pgsignal(tp->t_pgrp, SIGINT, 1);
|
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PGRP_UNLOCK(tp->t_pgrp);
|
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}
|
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goto endcase;
|
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}
|
|
if (ISSET(iflag, PARMRK))
|
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goto parmrk;
|
|
} else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
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|| ISSET(err, TTY_FE)) {
|
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if (ISSET(iflag, IGNPAR))
|
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return (0);
|
|
else if (ISSET(iflag, PARMRK)) {
|
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parmrk:
|
|
if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
|
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MAX_INPUT - 3)
|
|
goto input_overflow;
|
|
(void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
|
|
(void)putc(0 | TTY_QUOTE, &tp->t_rawq);
|
|
(void)putc(c | TTY_QUOTE, &tp->t_rawq);
|
|
goto endcase;
|
|
} else
|
|
c = 0;
|
|
}
|
|
}
|
|
|
|
if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
|
|
CLR(c, 0x80);
|
|
if (!ISSET(lflag, EXTPROC)) {
|
|
/*
|
|
* Check for literal nexting very first
|
|
*/
|
|
if (ISSET(tp->t_state, TS_LNCH)) {
|
|
SET(c, TTY_QUOTE);
|
|
CLR(tp->t_state, TS_LNCH);
|
|
}
|
|
/*
|
|
* Scan for special characters. This code
|
|
* is really just a big case statement with
|
|
* non-constant cases. The bottom of the
|
|
* case statement is labeled ``endcase'', so goto
|
|
* it after a case match, or similar.
|
|
*/
|
|
|
|
/*
|
|
* Control chars which aren't controlled
|
|
* by ICANON, ISIG, or IXON.
|
|
*/
|
|
if (ISSET(lflag, IEXTEN)) {
|
|
if (CCEQ(cc[VLNEXT], c)) {
|
|
if (ISSET(lflag, ECHO)) {
|
|
if (ISSET(lflag, ECHOE)) {
|
|
(void)ttyoutput('^', tp);
|
|
(void)ttyoutput('\b', tp);
|
|
} else
|
|
ttyecho(c, tp);
|
|
}
|
|
SET(tp->t_state, TS_LNCH);
|
|
goto endcase;
|
|
}
|
|
if (CCEQ(cc[VDISCARD], c)) {
|
|
if (ISSET(lflag, FLUSHO))
|
|
CLR(tp->t_lflag, FLUSHO);
|
|
else {
|
|
ttyflush(tp, FWRITE);
|
|
ttyecho(c, tp);
|
|
if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
|
|
ttyretype(tp);
|
|
SET(tp->t_lflag, FLUSHO);
|
|
}
|
|
goto startoutput;
|
|
}
|
|
}
|
|
/*
|
|
* Signals.
|
|
*/
|
|
if (ISSET(lflag, ISIG)) {
|
|
if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
|
|
if (!ISSET(lflag, NOFLSH))
|
|
ttyflush(tp, FREAD | FWRITE);
|
|
ttyecho(c, tp);
|
|
if (tp->t_pgrp != NULL) {
|
|
PGRP_LOCK(tp->t_pgrp);
|
|
pgsignal(tp->t_pgrp,
|
|
CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
|
|
PGRP_UNLOCK(tp->t_pgrp);
|
|
}
|
|
goto endcase;
|
|
}
|
|
if (CCEQ(cc[VSUSP], c)) {
|
|
if (!ISSET(lflag, NOFLSH))
|
|
ttyflush(tp, FREAD);
|
|
ttyecho(c, tp);
|
|
if (tp->t_pgrp != NULL) {
|
|
PGRP_LOCK(tp->t_pgrp);
|
|
pgsignal(tp->t_pgrp, SIGTSTP, 1);
|
|
PGRP_UNLOCK(tp->t_pgrp);
|
|
}
|
|
goto endcase;
|
|
}
|
|
}
|
|
/*
|
|
* Handle start/stop characters.
|
|
*/
|
|
if (ISSET(iflag, IXON)) {
|
|
if (CCEQ(cc[VSTOP], c)) {
|
|
if (!ISSET(tp->t_state, TS_TTSTOP)) {
|
|
SET(tp->t_state, TS_TTSTOP);
|
|
(*tp->t_stop)(tp, 0);
|
|
return (0);
|
|
}
|
|
if (!CCEQ(cc[VSTART], c))
|
|
return (0);
|
|
/*
|
|
* if VSTART == VSTOP then toggle
|
|
*/
|
|
goto endcase;
|
|
}
|
|
if (CCEQ(cc[VSTART], c))
|
|
goto restartoutput;
|
|
}
|
|
/*
|
|
* IGNCR, ICRNL, & INLCR
|
|
*/
|
|
if (c == '\r') {
|
|
if (ISSET(iflag, IGNCR))
|
|
return (0);
|
|
else if (ISSET(iflag, ICRNL))
|
|
c = '\n';
|
|
} else if (c == '\n' && ISSET(iflag, INLCR))
|
|
c = '\r';
|
|
}
|
|
if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
|
|
/*
|
|
* From here on down canonical mode character
|
|
* processing takes place.
|
|
*/
|
|
/*
|
|
* erase or erase2 (^H / ^?)
|
|
*/
|
|
if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
|
|
if (tp->t_rawq.c_cc)
|
|
ttyrub(unputc(&tp->t_rawq), tp);
|
|
goto endcase;
|
|
}
|
|
/*
|
|
* kill (^U)
|
|
*/
|
|
if (CCEQ(cc[VKILL], c)) {
|
|
if (ISSET(lflag, ECHOKE) &&
|
|
tp->t_rawq.c_cc == tp->t_rocount &&
|
|
!ISSET(lflag, ECHOPRT))
|
|
while (tp->t_rawq.c_cc)
|
|
ttyrub(unputc(&tp->t_rawq), tp);
|
|
else {
|
|
ttyecho(c, tp);
|
|
if (ISSET(lflag, ECHOK) ||
|
|
ISSET(lflag, ECHOKE))
|
|
ttyecho('\n', tp);
|
|
FLUSHQ(&tp->t_rawq);
|
|
tp->t_rocount = 0;
|
|
}
|
|
CLR(tp->t_state, TS_LOCAL);
|
|
goto endcase;
|
|
}
|
|
/*
|
|
* word erase (^W)
|
|
*/
|
|
if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
|
|
int ctype;
|
|
|
|
/*
|
|
* erase whitespace
|
|
*/
|
|
while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
|
|
ttyrub(c, tp);
|
|
if (c == -1)
|
|
goto endcase;
|
|
/*
|
|
* erase last char of word and remember the
|
|
* next chars type (for ALTWERASE)
|
|
*/
|
|
ttyrub(c, tp);
|
|
c = unputc(&tp->t_rawq);
|
|
if (c == -1)
|
|
goto endcase;
|
|
if (c == ' ' || c == '\t') {
|
|
(void)putc(c, &tp->t_rawq);
|
|
goto endcase;
|
|
}
|
|
ctype = ISALPHA(c);
|
|
/*
|
|
* erase rest of word
|
|
*/
|
|
do {
|
|
ttyrub(c, tp);
|
|
c = unputc(&tp->t_rawq);
|
|
if (c == -1)
|
|
goto endcase;
|
|
} while (c != ' ' && c != '\t' &&
|
|
(!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
|
|
(void)putc(c, &tp->t_rawq);
|
|
goto endcase;
|
|
}
|
|
/*
|
|
* reprint line (^R)
|
|
*/
|
|
if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
|
|
ttyretype(tp);
|
|
goto endcase;
|
|
}
|
|
/*
|
|
* ^T - kernel info and generate SIGINFO
|
|
*/
|
|
if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
|
|
if (ISSET(lflag, ISIG) && tp->t_pgrp != NULL) {
|
|
PGRP_LOCK(tp->t_pgrp);
|
|
pgsignal(tp->t_pgrp, SIGINFO, 1);
|
|
PGRP_UNLOCK(tp->t_pgrp);
|
|
}
|
|
if (!ISSET(lflag, NOKERNINFO))
|
|
ttyinfo(tp);
|
|
goto endcase;
|
|
}
|
|
}
|
|
/*
|
|
* Check for input buffer overflow
|
|
*/
|
|
if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
|
|
input_overflow:
|
|
if (ISSET(iflag, IMAXBEL)) {
|
|
if (tp->t_outq.c_cc < tp->t_ohiwat)
|
|
(void)ttyoutput(CTRL('g'), tp);
|
|
}
|
|
goto endcase;
|
|
}
|
|
|
|
if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
|
|
&& ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
|
|
(void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
|
|
|
|
/*
|
|
* Put data char in q for user and
|
|
* wakeup on seeing a line delimiter.
|
|
*/
|
|
if (putc(c, &tp->t_rawq) >= 0) {
|
|
if (!ISSET(lflag, ICANON)) {
|
|
ttwakeup(tp);
|
|
ttyecho(c, tp);
|
|
goto endcase;
|
|
}
|
|
if (TTBREAKC(c, lflag)) {
|
|
tp->t_rocount = 0;
|
|
catq(&tp->t_rawq, &tp->t_canq);
|
|
ttwakeup(tp);
|
|
} else if (tp->t_rocount++ == 0)
|
|
tp->t_rocol = tp->t_column;
|
|
if (ISSET(tp->t_state, TS_ERASE)) {
|
|
/*
|
|
* end of prterase \.../
|
|
*/
|
|
CLR(tp->t_state, TS_ERASE);
|
|
(void)ttyoutput('/', tp);
|
|
}
|
|
i = tp->t_column;
|
|
ttyecho(c, tp);
|
|
if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
|
|
/*
|
|
* Place the cursor over the '^' of the ^D.
|
|
*/
|
|
i = imin(2, tp->t_column - i);
|
|
while (i > 0) {
|
|
(void)ttyoutput('\b', tp);
|
|
i--;
|
|
}
|
|
}
|
|
}
|
|
endcase:
|
|
/*
|
|
* IXANY means allow any character to restart output.
|
|
*/
|
|
if (ISSET(tp->t_state, TS_TTSTOP) &&
|
|
!ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
|
|
return (0);
|
|
restartoutput:
|
|
CLR(tp->t_lflag, FLUSHO);
|
|
CLR(tp->t_state, TS_TTSTOP);
|
|
startoutput:
|
|
return (ttstart(tp));
|
|
}
|
|
|
|
/*
|
|
* Output a single character on a tty, doing output processing
|
|
* as needed (expanding tabs, newline processing, etc.).
|
|
* Returns < 0 if succeeds, otherwise returns char to resend.
|
|
* Must be recursive.
|
|
*/
|
|
static int
|
|
ttyoutput(int c, struct tty *tp)
|
|
{
|
|
tcflag_t oflag;
|
|
int col, s;
|
|
|
|
oflag = tp->t_oflag;
|
|
if (!ISSET(oflag, OPOST)) {
|
|
if (ISSET(tp->t_lflag, FLUSHO))
|
|
return (-1);
|
|
if (putc(c, &tp->t_outq))
|
|
return (c);
|
|
tk_nout++;
|
|
tp->t_outcc++;
|
|
return (-1);
|
|
}
|
|
/*
|
|
* Do tab expansion if OXTABS is set. Special case if we external
|
|
* processing, we don't do the tab expansion because we'll probably
|
|
* get it wrong. If tab expansion needs to be done, let it happen
|
|
* externally.
|
|
*/
|
|
CLR(c, ~TTY_CHARMASK);
|
|
if (c == '\t' &&
|
|
ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
|
|
c = 8 - (tp->t_column & 7);
|
|
if (!ISSET(tp->t_lflag, FLUSHO)) {
|
|
s = spltty(); /* Don't interrupt tabs. */
|
|
c -= b_to_q(" ", c, &tp->t_outq);
|
|
tk_nout += c;
|
|
tp->t_outcc += c;
|
|
splx(s);
|
|
}
|
|
tp->t_column += c;
|
|
return (c ? -1 : '\t');
|
|
}
|
|
if (c == CEOT && ISSET(oflag, ONOEOT))
|
|
return (-1);
|
|
|
|
/*
|
|
* Newline translation: if ONLCR is set,
|
|
* translate newline into "\r\n".
|
|
*/
|
|
if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
|
|
tk_nout++;
|
|
tp->t_outcc++;
|
|
if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq))
|
|
return (c);
|
|
}
|
|
/* If OCRNL is set, translate "\r" into "\n". */
|
|
else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
|
|
c = '\n';
|
|
/* If ONOCR is set, don't transmit CRs when on column 0. */
|
|
else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
|
|
return (-1);
|
|
|
|
tk_nout++;
|
|
tp->t_outcc++;
|
|
if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
|
|
return (c);
|
|
|
|
col = tp->t_column;
|
|
switch (CCLASS(c)) {
|
|
case BACKSPACE:
|
|
if (col > 0)
|
|
--col;
|
|
break;
|
|
case CONTROL:
|
|
break;
|
|
case NEWLINE:
|
|
if (ISSET(tp->t_oflag, ONLCR | ONLRET))
|
|
col = 0;
|
|
break;
|
|
case RETURN:
|
|
col = 0;
|
|
break;
|
|
case ORDINARY:
|
|
++col;
|
|
break;
|
|
case TAB:
|
|
col = (col + 8) & ~7;
|
|
break;
|
|
}
|
|
tp->t_column = col;
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Ioctls for all tty devices. Called after line-discipline specific ioctl
|
|
* has been called to do discipline-specific functions and/or reject any
|
|
* of these ioctl commands.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
|
|
{
|
|
struct proc *p;
|
|
struct thread *td;
|
|
struct pgrp *pgrp;
|
|
int s, error;
|
|
|
|
td = curthread; /* XXX */
|
|
p = td->td_proc;
|
|
|
|
/* If the ioctl involves modification, hang if in the background. */
|
|
switch (cmd) {
|
|
case TIOCCBRK:
|
|
case TIOCCONS:
|
|
case TIOCDRAIN:
|
|
case TIOCEXCL:
|
|
case TIOCFLUSH:
|
|
#ifdef TIOCHPCL
|
|
case TIOCHPCL:
|
|
#endif
|
|
case TIOCNXCL:
|
|
case TIOCSBRK:
|
|
case TIOCSCTTY:
|
|
case TIOCSDRAINWAIT:
|
|
case TIOCSETA:
|
|
case TIOCSETAF:
|
|
case TIOCSETAW:
|
|
case TIOCSETD:
|
|
case TIOCSPGRP:
|
|
case TIOCSTART:
|
|
case TIOCSTAT:
|
|
case TIOCSTI:
|
|
case TIOCSTOP:
|
|
case TIOCSWINSZ:
|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
|
|
case TIOCLBIC:
|
|
case TIOCLBIS:
|
|
case TIOCLSET:
|
|
case TIOCSETC:
|
|
case OTIOCSETD:
|
|
case TIOCSETN:
|
|
case TIOCSETP:
|
|
case TIOCSLTC:
|
|
#endif
|
|
sx_slock(&proctree_lock);
|
|
PROC_LOCK(p);
|
|
while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
|
|
!SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
|
|
!SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
|
|
pgrp = p->p_pgrp;
|
|
PROC_UNLOCK(p);
|
|
if (pgrp->pg_jobc == 0) {
|
|
sx_sunlock(&proctree_lock);
|
|
return (EIO);
|
|
}
|
|
PGRP_LOCK(pgrp);
|
|
sx_sunlock(&proctree_lock);
|
|
pgsignal(pgrp, SIGTTOU, 1);
|
|
PGRP_UNLOCK(pgrp);
|
|
error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1",
|
|
0);
|
|
if (error)
|
|
return (error);
|
|
sx_slock(&proctree_lock);
|
|
PROC_LOCK(p);
|
|
}
|
|
PROC_UNLOCK(p);
|
|
sx_sunlock(&proctree_lock);
|
|
break;
|
|
}
|
|
|
|
switch (cmd) { /* Process the ioctl. */
|
|
case FIOASYNC: /* set/clear async i/o */
|
|
s = spltty();
|
|
if (*(int *)data)
|
|
SET(tp->t_state, TS_ASYNC);
|
|
else
|
|
CLR(tp->t_state, TS_ASYNC);
|
|
splx(s);
|
|
break;
|
|
case FIONBIO: /* set/clear non-blocking i/o */
|
|
break; /* XXX: delete. */
|
|
case FIONREAD: /* get # bytes to read */
|
|
s = spltty();
|
|
*(int *)data = ttnread(tp);
|
|
splx(s);
|
|
break;
|
|
|
|
case FIOSETOWN:
|
|
/*
|
|
* Policy -- Don't allow FIOSETOWN on someone else's
|
|
* controlling tty
|
|
*/
|
|
if (tp->t_session != NULL && !isctty(p, tp))
|
|
return (ENOTTY);
|
|
|
|
error = fsetown(*(int *)data, &tp->t_sigio);
|
|
if (error)
|
|
return (error);
|
|
break;
|
|
case FIOGETOWN:
|
|
if (tp->t_session != NULL && !isctty(p, tp))
|
|
return (ENOTTY);
|
|
*(int *)data = fgetown(&tp->t_sigio);
|
|
break;
|
|
|
|
case TIOCEXCL: /* set exclusive use of tty */
|
|
s = spltty();
|
|
SET(tp->t_state, TS_XCLUDE);
|
|
splx(s);
|
|
break;
|
|
case TIOCFLUSH: { /* flush buffers */
|
|
int flags = *(int *)data;
|
|
|
|
if (flags == 0)
|
|
flags = FREAD | FWRITE;
|
|
else
|
|
flags &= FREAD | FWRITE;
|
|
ttyflush(tp, flags);
|
|
break;
|
|
}
|
|
case TIOCCONS: /* become virtual console */
|
|
if (*(int *)data) {
|
|
struct nameidata nid;
|
|
|
|
if (constty && constty != tp &&
|
|
ISSET(constty->t_state, TS_CONNECTED))
|
|
return (EBUSY);
|
|
|
|
/* Ensure user can open the real console. */
|
|
NDINIT(&nid, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE,
|
|
"/dev/console", td);
|
|
if ((error = namei(&nid)) != 0)
|
|
return (error);
|
|
NDFREE(&nid, NDF_ONLY_PNBUF);
|
|
error = VOP_ACCESS(nid.ni_vp, VREAD, td->td_ucred, td);
|
|
vput(nid.ni_vp);
|
|
if (error)
|
|
return (error);
|
|
|
|
constty = tp;
|
|
} else if (tp == constty)
|
|
constty = NULL;
|
|
break;
|
|
case TIOCDRAIN: /* wait till output drained */
|
|
error = ttywait(tp);
|
|
if (error)
|
|
return (error);
|
|
break;
|
|
case TIOCGETA: { /* get termios struct */
|
|
struct termios *t = (struct termios *)data;
|
|
|
|
bcopy(&tp->t_termios, t, sizeof(struct termios));
|
|
break;
|
|
}
|
|
case TIOCGETD: /* get line discipline */
|
|
*(int *)data = tp->t_line;
|
|
break;
|
|
case TIOCGWINSZ: /* get window size */
|
|
*(struct winsize *)data = tp->t_winsize;
|
|
break;
|
|
case TIOCGPGRP: /* get pgrp of tty */
|
|
if (!isctty(p, tp))
|
|
return (ENOTTY);
|
|
*(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
|
|
break;
|
|
#ifdef TIOCHPCL
|
|
case TIOCHPCL: /* hang up on last close */
|
|
s = spltty();
|
|
SET(tp->t_cflag, HUPCL);
|
|
splx(s);
|
|
break;
|
|
#endif
|
|
case TIOCNXCL: /* reset exclusive use of tty */
|
|
s = spltty();
|
|
CLR(tp->t_state, TS_XCLUDE);
|
|
splx(s);
|
|
break;
|
|
case TIOCOUTQ: /* output queue size */
|
|
*(int *)data = tp->t_outq.c_cc;
|
|
break;
|
|
case TIOCSETA: /* set termios struct */
|
|
case TIOCSETAW: /* drain output, set */
|
|
case TIOCSETAF: { /* drn out, fls in, set */
|
|
struct termios *t = (struct termios *)data;
|
|
|
|
if (t->c_ispeed == 0)
|
|
t->c_ispeed = t->c_ospeed;
|
|
if (t->c_ispeed == 0)
|
|
t->c_ispeed = tp->t_ospeed;
|
|
if (t->c_ispeed == 0)
|
|
return (EINVAL);
|
|
s = spltty();
|
|
if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
|
|
error = ttywait(tp);
|
|
if (error) {
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
if (cmd == TIOCSETAF)
|
|
ttyflush(tp, FREAD);
|
|
}
|
|
if (!ISSET(t->c_cflag, CIGNORE)) {
|
|
/*
|
|
* Set device hardware.
|
|
*/
|
|
if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
if (ISSET(t->c_cflag, CLOCAL) &&
|
|
!ISSET(tp->t_cflag, CLOCAL)) {
|
|
/*
|
|
* XXX disconnections would be too hard to
|
|
* get rid of without this kludge. The only
|
|
* way to get rid of controlling terminals
|
|
* is to exit from the session leader.
|
|
*/
|
|
CLR(tp->t_state, TS_ZOMBIE);
|
|
|
|
wakeup(TSA_CARR_ON(tp));
|
|
ttwakeup(tp);
|
|
ttwwakeup(tp);
|
|
}
|
|
if ((ISSET(tp->t_state, TS_CARR_ON) ||
|
|
ISSET(t->c_cflag, CLOCAL)) &&
|
|
!ISSET(tp->t_state, TS_ZOMBIE))
|
|
SET(tp->t_state, TS_CONNECTED);
|
|
else
|
|
CLR(tp->t_state, TS_CONNECTED);
|
|
tp->t_cflag = t->c_cflag;
|
|
tp->t_ispeed = t->c_ispeed;
|
|
if (t->c_ospeed != 0)
|
|
tp->t_ospeed = t->c_ospeed;
|
|
ttsetwater(tp);
|
|
}
|
|
if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
|
|
cmd != TIOCSETAF) {
|
|
if (ISSET(t->c_lflag, ICANON))
|
|
SET(tp->t_lflag, PENDIN);
|
|
else {
|
|
/*
|
|
* XXX we really shouldn't allow toggling
|
|
* ICANON while we're in a non-termios line
|
|
* discipline. Now we have to worry about
|
|
* panicing for a null queue.
|
|
*/
|
|
if (tp->t_canq.c_cbreserved > 0 &&
|
|
tp->t_rawq.c_cbreserved > 0) {
|
|
catq(&tp->t_rawq, &tp->t_canq);
|
|
/*
|
|
* XXX the queue limits may be
|
|
* different, so the old queue
|
|
* swapping method no longer works.
|
|
*/
|
|
catq(&tp->t_canq, &tp->t_rawq);
|
|
}
|
|
CLR(tp->t_lflag, PENDIN);
|
|
}
|
|
ttwakeup(tp);
|
|
}
|
|
tp->t_iflag = t->c_iflag;
|
|
tp->t_oflag = t->c_oflag;
|
|
/*
|
|
* Make the EXTPROC bit read only.
|
|
*/
|
|
if (ISSET(tp->t_lflag, EXTPROC))
|
|
SET(t->c_lflag, EXTPROC);
|
|
else
|
|
CLR(t->c_lflag, EXTPROC);
|
|
tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
|
|
if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
|
|
t->c_cc[VTIME] != tp->t_cc[VTIME])
|
|
ttwakeup(tp);
|
|
bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
|
|
splx(s);
|
|
break;
|
|
}
|
|
case TIOCSETD: { /* set line discipline */
|
|
int t = *(int *)data;
|
|
dev_t device = tp->t_dev;
|
|
|
|
if ((u_int)t >= nlinesw)
|
|
return (ENXIO);
|
|
if (t != tp->t_line) {
|
|
s = spltty();
|
|
(*linesw[tp->t_line].l_close)(tp, flag);
|
|
error = (*linesw[t].l_open)(device, tp);
|
|
if (error) {
|
|
(void)(*linesw[tp->t_line].l_open)(device, tp);
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
tp->t_line = t;
|
|
splx(s);
|
|
}
|
|
break;
|
|
}
|
|
case TIOCSTART: /* start output, like ^Q */
|
|
s = spltty();
|
|
if (ISSET(tp->t_state, TS_TTSTOP) ||
|
|
ISSET(tp->t_lflag, FLUSHO)) {
|
|
CLR(tp->t_lflag, FLUSHO);
|
|
CLR(tp->t_state, TS_TTSTOP);
|
|
ttstart(tp);
|
|
}
|
|
splx(s);
|
|
break;
|
|
case TIOCSTI: /* simulate terminal input */
|
|
if ((flag & FREAD) == 0 && suser(td))
|
|
return (EPERM);
|
|
if (!isctty(p, tp) && suser(td))
|
|
return (EACCES);
|
|
s = spltty();
|
|
(*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
|
|
splx(s);
|
|
break;
|
|
case TIOCSTOP: /* stop output, like ^S */
|
|
s = spltty();
|
|
if (!ISSET(tp->t_state, TS_TTSTOP)) {
|
|
SET(tp->t_state, TS_TTSTOP);
|
|
(*tp->t_stop)(tp, 0);
|
|
}
|
|
splx(s);
|
|
break;
|
|
case TIOCSCTTY: /* become controlling tty */
|
|
/* Session ctty vnode pointer set in vnode layer. */
|
|
sx_slock(&proctree_lock);
|
|
if (!SESS_LEADER(p) ||
|
|
((p->p_session->s_ttyvp || tp->t_session) &&
|
|
(tp->t_session != p->p_session))) {
|
|
sx_sunlock(&proctree_lock);
|
|
return (EPERM);
|
|
}
|
|
tp->t_session = p->p_session;
|
|
tp->t_pgrp = p->p_pgrp;
|
|
SESS_LOCK(p->p_session);
|
|
p->p_session->s_ttyp = tp;
|
|
SESS_UNLOCK(p->p_session);
|
|
PROC_LOCK(p);
|
|
p->p_flag |= P_CONTROLT;
|
|
PROC_UNLOCK(p);
|
|
sx_sunlock(&proctree_lock);
|
|
break;
|
|
case TIOCSPGRP: { /* set pgrp of tty */
|
|
sx_slock(&proctree_lock);
|
|
pgrp = pgfind(*(int *)data);
|
|
if (!isctty(p, tp)) {
|
|
if (pgrp != NULL)
|
|
PGRP_UNLOCK(pgrp);
|
|
sx_sunlock(&proctree_lock);
|
|
return (ENOTTY);
|
|
}
|
|
if (pgrp == NULL) {
|
|
sx_sunlock(&proctree_lock);
|
|
return (EPERM);
|
|
}
|
|
PGRP_UNLOCK(pgrp);
|
|
if (pgrp->pg_session != p->p_session) {
|
|
sx_sunlock(&proctree_lock);
|
|
return (EPERM);
|
|
}
|
|
sx_sunlock(&proctree_lock);
|
|
tp->t_pgrp = pgrp;
|
|
break;
|
|
}
|
|
case TIOCSTAT: /* simulate control-T */
|
|
s = spltty();
|
|
ttyinfo(tp);
|
|
splx(s);
|
|
break;
|
|
case TIOCSWINSZ: /* set window size */
|
|
if (bcmp((caddr_t)&tp->t_winsize, data,
|
|
sizeof (struct winsize))) {
|
|
tp->t_winsize = *(struct winsize *)data;
|
|
if (tp->t_pgrp != NULL) {
|
|
PGRP_LOCK(tp->t_pgrp);
|
|
pgsignal(tp->t_pgrp, SIGWINCH, 1);
|
|
PGRP_UNLOCK(tp->t_pgrp);
|
|
}
|
|
}
|
|
break;
|
|
case TIOCSDRAINWAIT:
|
|
error = suser(td);
|
|
if (error)
|
|
return (error);
|
|
tp->t_timeout = *(int *)data * hz;
|
|
wakeup(TSA_OCOMPLETE(tp));
|
|
wakeup(TSA_OLOWAT(tp));
|
|
break;
|
|
case TIOCGDRAINWAIT:
|
|
*(int *)data = tp->t_timeout / hz;
|
|
break;
|
|
default:
|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
|
|
return (ttcompat(tp, cmd, data, flag));
|
|
#else
|
|
return (ENOIOCTL);
|
|
#endif
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
ttypoll(dev_t dev, int events, struct thread *td)
|
|
{
|
|
int s;
|
|
int revents = 0;
|
|
struct tty *tp;
|
|
|
|
tp = dev->si_tty;
|
|
if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
|
|
return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
|
|
| POLLHUP);
|
|
|
|
s = spltty();
|
|
if (events & (POLLIN | POLLRDNORM)) {
|
|
if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
else
|
|
selrecord(td, &tp->t_rsel);
|
|
}
|
|
if (events & (POLLOUT | POLLWRNORM)) {
|
|
if ((tp->t_outq.c_cc <= tp->t_olowat &&
|
|
ISSET(tp->t_state, TS_CONNECTED))
|
|
|| ISSET(tp->t_state, TS_ZOMBIE))
|
|
revents |= events & (POLLOUT | POLLWRNORM);
|
|
else
|
|
selrecord(td, &tp->t_wsel);
|
|
}
|
|
splx(s);
|
|
return (revents);
|
|
}
|
|
|
|
static struct filterops ttyread_filtops =
|
|
{ 1, NULL, filt_ttyrdetach, filt_ttyread };
|
|
static struct filterops ttywrite_filtops =
|
|
{ 1, NULL, filt_ttywdetach, filt_ttywrite };
|
|
|
|
int
|
|
ttykqfilter(dev_t dev, struct knote *kn)
|
|
{
|
|
struct tty *tp = dev->si_tty;
|
|
struct klist *klist;
|
|
int s;
|
|
|
|
switch (kn->kn_filter) {
|
|
case EVFILT_READ:
|
|
klist = &tp->t_rsel.si_note;
|
|
kn->kn_fop = &ttyread_filtops;
|
|
break;
|
|
case EVFILT_WRITE:
|
|
klist = &tp->t_wsel.si_note;
|
|
kn->kn_fop = &ttywrite_filtops;
|
|
break;
|
|
default:
|
|
return (1);
|
|
}
|
|
|
|
kn->kn_hook = (caddr_t)dev;
|
|
|
|
s = spltty();
|
|
SLIST_INSERT_HEAD(klist, kn, kn_selnext);
|
|
splx(s);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
filt_ttyrdetach(struct knote *kn)
|
|
{
|
|
struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
|
|
int s = spltty();
|
|
|
|
SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
|
|
splx(s);
|
|
}
|
|
|
|
static int
|
|
filt_ttyread(struct knote *kn, long hint)
|
|
{
|
|
struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
|
|
|
|
kn->kn_data = ttnread(tp);
|
|
if (ISSET(tp->t_state, TS_ZOMBIE)) {
|
|
kn->kn_flags |= EV_EOF;
|
|
return (1);
|
|
}
|
|
return (kn->kn_data > 0);
|
|
}
|
|
|
|
static void
|
|
filt_ttywdetach(struct knote *kn)
|
|
{
|
|
struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
|
|
int s = spltty();
|
|
|
|
SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
|
|
splx(s);
|
|
}
|
|
|
|
static int
|
|
filt_ttywrite(struct knote *kn, long hint)
|
|
{
|
|
struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
|
|
|
|
kn->kn_data = tp->t_outq.c_cc;
|
|
if (ISSET(tp->t_state, TS_ZOMBIE))
|
|
return (1);
|
|
return (kn->kn_data <= tp->t_olowat &&
|
|
ISSET(tp->t_state, TS_CONNECTED));
|
|
}
|
|
|
|
/*
|
|
* Must be called at spltty().
|
|
*/
|
|
static int
|
|
ttnread(struct tty *tp)
|
|
{
|
|
int nread;
|
|
|
|
if (ISSET(tp->t_lflag, PENDIN))
|
|
ttypend(tp);
|
|
nread = tp->t_canq.c_cc;
|
|
if (!ISSET(tp->t_lflag, ICANON)) {
|
|
nread += tp->t_rawq.c_cc;
|
|
if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
|
|
nread = 0;
|
|
}
|
|
return (nread);
|
|
}
|
|
|
|
/*
|
|
* Wait for output to drain.
|
|
*/
|
|
int
|
|
ttywait(struct tty *tp)
|
|
{
|
|
int error, s;
|
|
|
|
error = 0;
|
|
s = spltty();
|
|
while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
|
|
ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
|
|
(*tp->t_oproc)(tp);
|
|
if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
|
|
ISSET(tp->t_state, TS_CONNECTED)) {
|
|
SET(tp->t_state, TS_SO_OCOMPLETE);
|
|
error = ttysleep(tp, TSA_OCOMPLETE(tp),
|
|
TTOPRI | PCATCH, "ttywai",
|
|
tp->t_timeout);
|
|
if (error) {
|
|
if (error == EWOULDBLOCK)
|
|
error = EIO;
|
|
break;
|
|
}
|
|
} else
|
|
break;
|
|
}
|
|
if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
|
|
error = EIO;
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Flush if successfully wait.
|
|
*/
|
|
static int
|
|
ttywflush(struct tty *tp)
|
|
{
|
|
int error;
|
|
|
|
if ((error = ttywait(tp)) == 0)
|
|
ttyflush(tp, FREAD);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Flush tty read and/or write queues, notifying anyone waiting.
|
|
*/
|
|
void
|
|
ttyflush(struct tty *tp, int rw)
|
|
{
|
|
int s;
|
|
|
|
s = spltty();
|
|
#if 0
|
|
again:
|
|
#endif
|
|
if (rw & FWRITE) {
|
|
FLUSHQ(&tp->t_outq);
|
|
CLR(tp->t_state, TS_TTSTOP);
|
|
}
|
|
(*tp->t_stop)(tp, rw);
|
|
if (rw & FREAD) {
|
|
FLUSHQ(&tp->t_canq);
|
|
FLUSHQ(&tp->t_rawq);
|
|
CLR(tp->t_lflag, PENDIN);
|
|
tp->t_rocount = 0;
|
|
tp->t_rocol = 0;
|
|
CLR(tp->t_state, TS_LOCAL);
|
|
ttwakeup(tp);
|
|
if (ISSET(tp->t_state, TS_TBLOCK)) {
|
|
if (rw & FWRITE)
|
|
FLUSHQ(&tp->t_outq);
|
|
ttyunblock(tp);
|
|
|
|
/*
|
|
* Don't let leave any state that might clobber the
|
|
* next line discipline (although we should do more
|
|
* to send the START char). Not clearing the state
|
|
* may have caused the "putc to a clist with no
|
|
* reserved cblocks" panic/printf.
|
|
*/
|
|
CLR(tp->t_state, TS_TBLOCK);
|
|
|
|
#if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
|
|
if (ISSET(tp->t_iflag, IXOFF)) {
|
|
/*
|
|
* XXX wait a bit in the hope that the stop
|
|
* character (if any) will go out. Waiting
|
|
* isn't good since it allows races. This
|
|
* will be fixed when the stop character is
|
|
* put in a special queue. Don't bother with
|
|
* the checks in ttywait() since the timeout
|
|
* will save us.
|
|
*/
|
|
SET(tp->t_state, TS_SO_OCOMPLETE);
|
|
ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI,
|
|
"ttyfls", hz / 10);
|
|
/*
|
|
* Don't try sending the stop character again.
|
|
*/
|
|
CLR(tp->t_state, TS_TBLOCK);
|
|
goto again;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
if (rw & FWRITE) {
|
|
FLUSHQ(&tp->t_outq);
|
|
ttwwakeup(tp);
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Copy in the default termios characters.
|
|
*/
|
|
void
|
|
termioschars(struct termios *t)
|
|
{
|
|
|
|
bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
|
|
}
|
|
|
|
/*
|
|
* Old interface.
|
|
*/
|
|
void
|
|
ttychars(struct tty *tp)
|
|
{
|
|
|
|
termioschars(&tp->t_termios);
|
|
}
|
|
|
|
/*
|
|
* Handle input high water. Send stop character for the IXOFF case. Turn
|
|
* on our input flow control bit and propagate the changes to the driver.
|
|
* XXX the stop character should be put in a special high priority queue.
|
|
*/
|
|
void
|
|
ttyblock(struct tty *tp)
|
|
{
|
|
|
|
SET(tp->t_state, TS_TBLOCK);
|
|
if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
|
|
putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
|
|
CLR(tp->t_state, TS_TBLOCK); /* try again later */
|
|
ttstart(tp);
|
|
}
|
|
|
|
/*
|
|
* Handle input low water. Send start character for the IXOFF case. Turn
|
|
* off our input flow control bit and propagate the changes to the driver.
|
|
* XXX the start character should be put in a special high priority queue.
|
|
*/
|
|
static void
|
|
ttyunblock(struct tty *tp)
|
|
{
|
|
|
|
CLR(tp->t_state, TS_TBLOCK);
|
|
if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
|
|
putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
|
|
SET(tp->t_state, TS_TBLOCK); /* try again later */
|
|
ttstart(tp);
|
|
}
|
|
|
|
#ifdef notyet
|
|
/* Not used by any current (i386) drivers. */
|
|
/*
|
|
* Restart after an inter-char delay.
|
|
*/
|
|
void
|
|
ttrstrt(void *tp_arg)
|
|
{
|
|
struct tty *tp;
|
|
int s;
|
|
|
|
KASSERT(tp_arg != NULL, ("ttrstrt"));
|
|
|
|
tp = tp_arg;
|
|
s = spltty();
|
|
|
|
CLR(tp->t_state, TS_TIMEOUT);
|
|
ttstart(tp);
|
|
|
|
splx(s);
|
|
}
|
|
#endif
|
|
|
|
int
|
|
ttstart(struct tty *tp)
|
|
{
|
|
|
|
if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
|
|
(*tp->t_oproc)(tp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* "close" a line discipline
|
|
*/
|
|
int
|
|
ttylclose(struct tty *tp, int flag)
|
|
{
|
|
|
|
if (flag & FNONBLOCK || ttywflush(tp))
|
|
ttyflush(tp, FREAD | FWRITE);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Handle modem control transition on a tty.
|
|
* Flag indicates new state of carrier.
|
|
* Returns 0 if the line should be turned off, otherwise 1.
|
|
*/
|
|
int
|
|
ttymodem(struct tty *tp, int flag)
|
|
{
|
|
|
|
if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
|
|
/*
|
|
* MDMBUF: do flow control according to carrier flag
|
|
* XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
|
|
* works if IXON and IXANY are clear.
|
|
*/
|
|
if (flag) {
|
|
CLR(tp->t_state, TS_CAR_OFLOW);
|
|
CLR(tp->t_state, TS_TTSTOP);
|
|
ttstart(tp);
|
|
} else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
|
|
SET(tp->t_state, TS_CAR_OFLOW);
|
|
SET(tp->t_state, TS_TTSTOP);
|
|
(*tp->t_stop)(tp, 0);
|
|
}
|
|
} else if (flag == 0) {
|
|
/*
|
|
* Lost carrier.
|
|
*/
|
|
CLR(tp->t_state, TS_CARR_ON);
|
|
if (ISSET(tp->t_state, TS_ISOPEN) &&
|
|
!ISSET(tp->t_cflag, CLOCAL)) {
|
|
SET(tp->t_state, TS_ZOMBIE);
|
|
CLR(tp->t_state, TS_CONNECTED);
|
|
if (tp->t_session) {
|
|
sx_slock(&proctree_lock);
|
|
if (tp->t_session->s_leader) {
|
|
struct proc *p;
|
|
|
|
p = tp->t_session->s_leader;
|
|
PROC_LOCK(p);
|
|
psignal(p, SIGHUP);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
sx_sunlock(&proctree_lock);
|
|
}
|
|
ttyflush(tp, FREAD | FWRITE);
|
|
return (0);
|
|
}
|
|
} else {
|
|
/*
|
|
* Carrier now on.
|
|
*/
|
|
SET(tp->t_state, TS_CARR_ON);
|
|
if (!ISSET(tp->t_state, TS_ZOMBIE))
|
|
SET(tp->t_state, TS_CONNECTED);
|
|
wakeup(TSA_CARR_ON(tp));
|
|
ttwakeup(tp);
|
|
ttwwakeup(tp);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Reinput pending characters after state switch
|
|
* call at spltty().
|
|
*/
|
|
static void
|
|
ttypend(struct tty *tp)
|
|
{
|
|
struct clist tq;
|
|
int c;
|
|
|
|
CLR(tp->t_lflag, PENDIN);
|
|
SET(tp->t_state, TS_TYPEN);
|
|
/*
|
|
* XXX this assumes too much about clist internals. It may even
|
|
* fail if the cblock slush pool is empty. We can't allocate more
|
|
* cblocks here because we are called from an interrupt handler
|
|
* and clist_alloc_cblocks() can wait.
|
|
*/
|
|
tq = tp->t_rawq;
|
|
bzero(&tp->t_rawq, sizeof tp->t_rawq);
|
|
tp->t_rawq.c_cbmax = tq.c_cbmax;
|
|
tp->t_rawq.c_cbreserved = tq.c_cbreserved;
|
|
while ((c = getc(&tq)) >= 0)
|
|
ttyinput(c, tp);
|
|
CLR(tp->t_state, TS_TYPEN);
|
|
}
|
|
|
|
/*
|
|
* Process a read call on a tty device.
|
|
*/
|
|
int
|
|
ttread(struct tty *tp, struct uio *uio, int flag)
|
|
{
|
|
struct clist *qp;
|
|
int c;
|
|
tcflag_t lflag;
|
|
cc_t *cc = tp->t_cc;
|
|
struct proc *p = curproc;
|
|
int s, first, error = 0;
|
|
int has_stime = 0, last_cc = 0;
|
|
long slp = 0; /* XXX this should be renamed `timo'. */
|
|
struct timeval stime;
|
|
struct pgrp *pg;
|
|
|
|
loop:
|
|
s = spltty();
|
|
lflag = tp->t_lflag;
|
|
/*
|
|
* take pending input first
|
|
*/
|
|
if (ISSET(lflag, PENDIN)) {
|
|
ttypend(tp);
|
|
splx(s); /* reduce latency */
|
|
s = spltty();
|
|
lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
|
|
}
|
|
|
|
/*
|
|
* Hang process if it's in the background.
|
|
*/
|
|
if (isbackground(p, tp)) {
|
|
splx(s);
|
|
sx_slock(&proctree_lock);
|
|
PROC_LOCK(p);
|
|
if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
|
|
SIGISMEMBER(p->p_sigmask, SIGTTIN) ||
|
|
(p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0) {
|
|
PROC_UNLOCK(p);
|
|
sx_sunlock(&proctree_lock);
|
|
return (EIO);
|
|
}
|
|
pg = p->p_pgrp;
|
|
PROC_UNLOCK(p);
|
|
PGRP_LOCK(pg);
|
|
sx_sunlock(&proctree_lock);
|
|
pgsignal(pg, SIGTTIN, 1);
|
|
PGRP_UNLOCK(pg);
|
|
error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0);
|
|
if (error)
|
|
return (error);
|
|
goto loop;
|
|
}
|
|
|
|
if (ISSET(tp->t_state, TS_ZOMBIE)) {
|
|
splx(s);
|
|
return (0); /* EOF */
|
|
}
|
|
|
|
/*
|
|
* If canonical, use the canonical queue,
|
|
* else use the raw queue.
|
|
*
|
|
* (should get rid of clists...)
|
|
*/
|
|
qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
|
|
|
|
if (flag & IO_NDELAY) {
|
|
if (qp->c_cc > 0)
|
|
goto read;
|
|
if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
splx(s);
|
|
return (EWOULDBLOCK);
|
|
}
|
|
if (!ISSET(lflag, ICANON)) {
|
|
int m = cc[VMIN];
|
|
long t = cc[VTIME];
|
|
struct timeval timecopy;
|
|
|
|
/*
|
|
* Check each of the four combinations.
|
|
* (m > 0 && t == 0) is the normal read case.
|
|
* It should be fairly efficient, so we check that and its
|
|
* companion case (m == 0 && t == 0) first.
|
|
* For the other two cases, we compute the target sleep time
|
|
* into slp.
|
|
*/
|
|
if (t == 0) {
|
|
if (qp->c_cc < m)
|
|
goto sleep;
|
|
if (qp->c_cc > 0)
|
|
goto read;
|
|
|
|
/* m, t and qp->c_cc are all 0. 0 is enough input. */
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
t *= 100000; /* time in us */
|
|
#define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
|
|
((t1).tv_usec - (t2).tv_usec))
|
|
if (m > 0) {
|
|
if (qp->c_cc <= 0)
|
|
goto sleep;
|
|
if (qp->c_cc >= m)
|
|
goto read;
|
|
getmicrotime(&timecopy);
|
|
if (!has_stime) {
|
|
/* first character, start timer */
|
|
has_stime = 1;
|
|
stime = timecopy;
|
|
slp = t;
|
|
} else if (qp->c_cc > last_cc) {
|
|
/* got a character, restart timer */
|
|
stime = timecopy;
|
|
slp = t;
|
|
} else {
|
|
/* nothing, check expiration */
|
|
slp = t - diff(timecopy, stime);
|
|
if (slp <= 0)
|
|
goto read;
|
|
}
|
|
last_cc = qp->c_cc;
|
|
} else { /* m == 0 */
|
|
if (qp->c_cc > 0)
|
|
goto read;
|
|
getmicrotime(&timecopy);
|
|
if (!has_stime) {
|
|
has_stime = 1;
|
|
stime = timecopy;
|
|
slp = t;
|
|
} else {
|
|
slp = t - diff(timecopy, stime);
|
|
if (slp <= 0) {
|
|
/* Timed out, but 0 is enough input. */
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
}
|
|
}
|
|
#undef diff
|
|
/*
|
|
* Rounding down may make us wake up just short
|
|
* of the target, so we round up.
|
|
* The formula is ceiling(slp * hz/1000000).
|
|
* 32-bit arithmetic is enough for hz < 169.
|
|
* XXX see tvtohz() for how to avoid overflow if hz
|
|
* is large (divide by `tick' and/or arrange to
|
|
* use tvtohz() if hz is large).
|
|
*/
|
|
slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
|
|
goto sleep;
|
|
}
|
|
if (qp->c_cc <= 0) {
|
|
sleep:
|
|
/*
|
|
* There is no input, or not enough input and we can block.
|
|
*/
|
|
error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH,
|
|
ISSET(tp->t_state, TS_CONNECTED) ?
|
|
"ttyin" : "ttyhup", (int)slp);
|
|
splx(s);
|
|
if (error == EWOULDBLOCK)
|
|
error = 0;
|
|
else if (error)
|
|
return (error);
|
|
/*
|
|
* XXX what happens if another process eats some input
|
|
* while we are asleep (not just here)? It would be
|
|
* safest to detect changes and reset our state variables
|
|
* (has_stime and last_cc).
|
|
*/
|
|
slp = 0;
|
|
goto loop;
|
|
}
|
|
read:
|
|
splx(s);
|
|
/*
|
|
* Input present, check for input mapping and processing.
|
|
*/
|
|
first = 1;
|
|
if (ISSET(lflag, ICANON | ISIG))
|
|
goto slowcase;
|
|
for (;;) {
|
|
char ibuf[IBUFSIZ];
|
|
int icc;
|
|
|
|
icc = imin(uio->uio_resid, IBUFSIZ);
|
|
icc = q_to_b(qp, ibuf, icc);
|
|
if (icc <= 0) {
|
|
if (first)
|
|
goto loop;
|
|
break;
|
|
}
|
|
error = uiomove(ibuf, icc, uio);
|
|
/*
|
|
* XXX if there was an error then we should ungetc() the
|
|
* unmoved chars and reduce icc here.
|
|
*/
|
|
if (error)
|
|
break;
|
|
if (uio->uio_resid == 0)
|
|
break;
|
|
first = 0;
|
|
}
|
|
goto out;
|
|
slowcase:
|
|
for (;;) {
|
|
c = getc(qp);
|
|
if (c < 0) {
|
|
if (first)
|
|
goto loop;
|
|
break;
|
|
}
|
|
/*
|
|
* delayed suspend (^Y)
|
|
*/
|
|
if (CCEQ(cc[VDSUSP], c) &&
|
|
ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
|
|
if (tp->t_pgrp != NULL) {
|
|
PGRP_LOCK(tp->t_pgrp);
|
|
pgsignal(tp->t_pgrp, SIGTSTP, 1);
|
|
PGRP_UNLOCK(tp->t_pgrp);
|
|
}
|
|
if (first) {
|
|
error = ttysleep(tp, &lbolt, TTIPRI | PCATCH,
|
|
"ttybg3", 0);
|
|
if (error)
|
|
break;
|
|
goto loop;
|
|
}
|
|
break;
|
|
}
|
|
/*
|
|
* Interpret EOF only in canonical mode.
|
|
*/
|
|
if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
|
|
break;
|
|
/*
|
|
* Give user character.
|
|
*/
|
|
error = ureadc(c, uio);
|
|
if (error)
|
|
/* XXX should ungetc(c, qp). */
|
|
break;
|
|
if (uio->uio_resid == 0)
|
|
break;
|
|
/*
|
|
* In canonical mode check for a "break character"
|
|
* marking the end of a "line of input".
|
|
*/
|
|
if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
|
|
break;
|
|
first = 0;
|
|
}
|
|
|
|
out:
|
|
/*
|
|
* Look to unblock input now that (presumably)
|
|
* the input queue has gone down.
|
|
*/
|
|
s = spltty();
|
|
if (ISSET(tp->t_state, TS_TBLOCK) &&
|
|
tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
|
|
ttyunblock(tp);
|
|
splx(s);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Check the output queue on tp for space for a kernel message (from uprintf
|
|
* or tprintf). Allow some space over the normal hiwater mark so we don't
|
|
* lose messages due to normal flow control, but don't let the tty run amok.
|
|
* Sleeps here are not interruptible, but we return prematurely if new signals
|
|
* arrive.
|
|
*/
|
|
int
|
|
ttycheckoutq(struct tty *tp, int wait)
|
|
{
|
|
int hiwat, s;
|
|
sigset_t oldmask;
|
|
|
|
hiwat = tp->t_ohiwat;
|
|
SIGEMPTYSET(oldmask);
|
|
s = spltty();
|
|
if (wait)
|
|
oldmask = curproc->p_siglist;
|
|
if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100)
|
|
while (tp->t_outq.c_cc > hiwat) {
|
|
ttstart(tp);
|
|
if (tp->t_outq.c_cc <= hiwat)
|
|
break;
|
|
if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) {
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
SET(tp->t_state, TS_SO_OLOWAT);
|
|
tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz);
|
|
}
|
|
splx(s);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Process a write call on a tty device.
|
|
*/
|
|
int
|
|
ttwrite(struct tty *tp, struct uio *uio, int flag)
|
|
{
|
|
char *cp = NULL;
|
|
int cc, ce;
|
|
struct proc *p;
|
|
int i, hiwat, cnt, error, s;
|
|
char obuf[OBUFSIZ];
|
|
|
|
hiwat = tp->t_ohiwat;
|
|
cnt = uio->uio_resid;
|
|
error = 0;
|
|
cc = 0;
|
|
loop:
|
|
s = spltty();
|
|
if (ISSET(tp->t_state, TS_ZOMBIE)) {
|
|
splx(s);
|
|
if (uio->uio_resid == cnt)
|
|
error = EIO;
|
|
goto out;
|
|
}
|
|
if (!ISSET(tp->t_state, TS_CONNECTED)) {
|
|
if (flag & IO_NDELAY) {
|
|
splx(s);
|
|
error = EWOULDBLOCK;
|
|
goto out;
|
|
}
|
|
error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
|
|
"ttydcd", 0);
|
|
splx(s);
|
|
if (error)
|
|
goto out;
|
|
goto loop;
|
|
}
|
|
splx(s);
|
|
/*
|
|
* Hang the process if it's in the background.
|
|
*/
|
|
p = curproc;
|
|
sx_slock(&proctree_lock);
|
|
PROC_LOCK(p);
|
|
if (isbackground(p, tp) &&
|
|
ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) &&
|
|
!SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
|
|
!SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
|
|
if (p->p_pgrp->pg_jobc == 0) {
|
|
PROC_UNLOCK(p);
|
|
sx_sunlock(&proctree_lock);
|
|
error = EIO;
|
|
goto out;
|
|
}
|
|
PROC_UNLOCK(p);
|
|
PGRP_LOCK(p->p_pgrp);
|
|
sx_sunlock(&proctree_lock);
|
|
pgsignal(p->p_pgrp, SIGTTOU, 1);
|
|
PGRP_UNLOCK(p->p_pgrp);
|
|
error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0);
|
|
if (error)
|
|
goto out;
|
|
goto loop;
|
|
} else {
|
|
PROC_UNLOCK(p);
|
|
sx_sunlock(&proctree_lock);
|
|
}
|
|
/*
|
|
* Process the user's data in at most OBUFSIZ chunks. Perform any
|
|
* output translation. Keep track of high water mark, sleep on
|
|
* overflow awaiting device aid in acquiring new space.
|
|
*/
|
|
while (uio->uio_resid > 0 || cc > 0) {
|
|
if (ISSET(tp->t_lflag, FLUSHO)) {
|
|
uio->uio_resid = 0;
|
|
return (0);
|
|
}
|
|
if (tp->t_outq.c_cc > hiwat)
|
|
goto ovhiwat;
|
|
/*
|
|
* Grab a hunk of data from the user, unless we have some
|
|
* leftover from last time.
|
|
*/
|
|
if (cc == 0) {
|
|
cc = imin(uio->uio_resid, OBUFSIZ);
|
|
cp = obuf;
|
|
error = uiomove(cp, cc, uio);
|
|
if (error) {
|
|
cc = 0;
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* If nothing fancy need be done, grab those characters we
|
|
* can handle without any of ttyoutput's processing and
|
|
* just transfer them to the output q. For those chars
|
|
* which require special processing (as indicated by the
|
|
* bits in char_type), call ttyoutput. After processing
|
|
* a hunk of data, look for FLUSHO so ^O's will take effect
|
|
* immediately.
|
|
*/
|
|
while (cc > 0) {
|
|
if (!ISSET(tp->t_oflag, OPOST))
|
|
ce = cc;
|
|
else {
|
|
ce = cc - scanc((u_int)cc, (u_char *)cp,
|
|
char_type, CCLASSMASK);
|
|
/*
|
|
* If ce is zero, then we're processing
|
|
* a special character through ttyoutput.
|
|
*/
|
|
if (ce == 0) {
|
|
tp->t_rocount = 0;
|
|
if (ttyoutput(*cp, tp) >= 0) {
|
|
/* No Clists, wait a bit. */
|
|
ttstart(tp);
|
|
if (flag & IO_NDELAY) {
|
|
error = EWOULDBLOCK;
|
|
goto out;
|
|
}
|
|
error = ttysleep(tp, &lbolt,
|
|
TTOPRI|PCATCH,
|
|
"ttybf1", 0);
|
|
if (error)
|
|
goto out;
|
|
goto loop;
|
|
}
|
|
cp++;
|
|
cc--;
|
|
if (ISSET(tp->t_lflag, FLUSHO) ||
|
|
tp->t_outq.c_cc > hiwat)
|
|
goto ovhiwat;
|
|
continue;
|
|
}
|
|
}
|
|
/*
|
|
* A bunch of normal characters have been found.
|
|
* Transfer them en masse to the output queue and
|
|
* continue processing at the top of the loop.
|
|
* If there are any further characters in this
|
|
* <= OBUFSIZ chunk, the first should be a character
|
|
* requiring special handling by ttyoutput.
|
|
*/
|
|
tp->t_rocount = 0;
|
|
i = b_to_q(cp, ce, &tp->t_outq);
|
|
ce -= i;
|
|
tp->t_column += ce;
|
|
cp += ce, cc -= ce, tk_nout += ce;
|
|
tp->t_outcc += ce;
|
|
if (i > 0) {
|
|
/* No Clists, wait a bit. */
|
|
ttstart(tp);
|
|
if (flag & IO_NDELAY) {
|
|
error = EWOULDBLOCK;
|
|
goto out;
|
|
}
|
|
error = ttysleep(tp, &lbolt, TTOPRI | PCATCH,
|
|
"ttybf2", 0);
|
|
if (error)
|
|
goto out;
|
|
goto loop;
|
|
}
|
|
if (ISSET(tp->t_lflag, FLUSHO) ||
|
|
tp->t_outq.c_cc > hiwat)
|
|
break;
|
|
}
|
|
ttstart(tp);
|
|
}
|
|
out:
|
|
/*
|
|
* If cc is nonzero, we leave the uio structure inconsistent, as the
|
|
* offset and iov pointers have moved forward, but it doesn't matter
|
|
* (the call will either return short or restart with a new uio).
|
|
*/
|
|
uio->uio_resid += cc;
|
|
return (error);
|
|
|
|
ovhiwat:
|
|
ttstart(tp);
|
|
s = spltty();
|
|
/*
|
|
* This can only occur if FLUSHO is set in t_lflag,
|
|
* or if ttstart/oproc is synchronous (or very fast).
|
|
*/
|
|
if (tp->t_outq.c_cc <= hiwat) {
|
|
splx(s);
|
|
goto loop;
|
|
}
|
|
if (flag & IO_NDELAY) {
|
|
splx(s);
|
|
uio->uio_resid += cc;
|
|
return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
|
|
}
|
|
SET(tp->t_state, TS_SO_OLOWAT);
|
|
error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri",
|
|
tp->t_timeout);
|
|
splx(s);
|
|
if (error == EWOULDBLOCK)
|
|
error = EIO;
|
|
if (error)
|
|
goto out;
|
|
goto loop;
|
|
}
|
|
|
|
/*
|
|
* Rubout one character from the rawq of tp
|
|
* as cleanly as possible.
|
|
*/
|
|
static void
|
|
ttyrub(int c, struct tty *tp)
|
|
{
|
|
char *cp;
|
|
int savecol;
|
|
int tabc, s;
|
|
|
|
if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
|
|
return;
|
|
CLR(tp->t_lflag, FLUSHO);
|
|
if (ISSET(tp->t_lflag, ECHOE)) {
|
|
if (tp->t_rocount == 0) {
|
|
/*
|
|
* Screwed by ttwrite; retype
|
|
*/
|
|
ttyretype(tp);
|
|
return;
|
|
}
|
|
if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
|
|
ttyrubo(tp, 2);
|
|
else {
|
|
CLR(c, ~TTY_CHARMASK);
|
|
switch (CCLASS(c)) {
|
|
case ORDINARY:
|
|
ttyrubo(tp, 1);
|
|
break;
|
|
case BACKSPACE:
|
|
case CONTROL:
|
|
case NEWLINE:
|
|
case RETURN:
|
|
case VTAB:
|
|
if (ISSET(tp->t_lflag, ECHOCTL))
|
|
ttyrubo(tp, 2);
|
|
break;
|
|
case TAB:
|
|
if (tp->t_rocount < tp->t_rawq.c_cc) {
|
|
ttyretype(tp);
|
|
return;
|
|
}
|
|
s = spltty();
|
|
savecol = tp->t_column;
|
|
SET(tp->t_state, TS_CNTTB);
|
|
SET(tp->t_lflag, FLUSHO);
|
|
tp->t_column = tp->t_rocol;
|
|
cp = tp->t_rawq.c_cf;
|
|
if (cp)
|
|
tabc = *cp; /* XXX FIX NEXTC */
|
|
for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
|
|
ttyecho(tabc, tp);
|
|
CLR(tp->t_lflag, FLUSHO);
|
|
CLR(tp->t_state, TS_CNTTB);
|
|
splx(s);
|
|
|
|
/* savecol will now be length of the tab. */
|
|
savecol -= tp->t_column;
|
|
tp->t_column += savecol;
|
|
if (savecol > 8)
|
|
savecol = 8; /* overflow screw */
|
|
while (--savecol >= 0)
|
|
(void)ttyoutput('\b', tp);
|
|
break;
|
|
default: /* XXX */
|
|
#define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
|
|
(void)printf(PANICSTR, c, CCLASS(c));
|
|
#ifdef notdef
|
|
panic(PANICSTR, c, CCLASS(c));
|
|
#endif
|
|
}
|
|
}
|
|
} else if (ISSET(tp->t_lflag, ECHOPRT)) {
|
|
if (!ISSET(tp->t_state, TS_ERASE)) {
|
|
SET(tp->t_state, TS_ERASE);
|
|
(void)ttyoutput('\\', tp);
|
|
}
|
|
ttyecho(c, tp);
|
|
} else {
|
|
ttyecho(tp->t_cc[VERASE], tp);
|
|
/*
|
|
* This code may be executed not only when an ERASE key
|
|
* is pressed, but also when ^U (KILL) or ^W (WERASE) are.
|
|
* So, I didn't think it was worthwhile to pass the extra
|
|
* information (which would need an extra parameter,
|
|
* changing every call) needed to distinguish the ERASE2
|
|
* case from the ERASE.
|
|
*/
|
|
}
|
|
--tp->t_rocount;
|
|
}
|
|
|
|
/*
|
|
* Back over cnt characters, erasing them.
|
|
*/
|
|
static void
|
|
ttyrubo(struct tty *tp, int cnt)
|
|
{
|
|
|
|
while (cnt-- > 0) {
|
|
(void)ttyoutput('\b', tp);
|
|
(void)ttyoutput(' ', tp);
|
|
(void)ttyoutput('\b', tp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ttyretype --
|
|
* Reprint the rawq line. Note, it is assumed that c_cc has already
|
|
* been checked.
|
|
*/
|
|
static void
|
|
ttyretype(struct tty *tp)
|
|
{
|
|
char *cp;
|
|
int s, c;
|
|
|
|
/* Echo the reprint character. */
|
|
if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
|
|
ttyecho(tp->t_cc[VREPRINT], tp);
|
|
|
|
(void)ttyoutput('\n', tp);
|
|
|
|
/*
|
|
* XXX
|
|
* FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
|
|
* BIT OF FIRST CHAR.
|
|
*/
|
|
s = spltty();
|
|
for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
|
|
cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
|
|
ttyecho(c, tp);
|
|
for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
|
|
cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
|
|
ttyecho(c, tp);
|
|
CLR(tp->t_state, TS_ERASE);
|
|
splx(s);
|
|
|
|
tp->t_rocount = tp->t_rawq.c_cc;
|
|
tp->t_rocol = 0;
|
|
}
|
|
|
|
/*
|
|
* Echo a typed character to the terminal.
|
|
*/
|
|
static void
|
|
ttyecho(int c, struct tty *tp)
|
|
{
|
|
|
|
if (!ISSET(tp->t_state, TS_CNTTB))
|
|
CLR(tp->t_lflag, FLUSHO);
|
|
if ((!ISSET(tp->t_lflag, ECHO) &&
|
|
(c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
|
|
ISSET(tp->t_lflag, EXTPROC))
|
|
return;
|
|
if (ISSET(tp->t_lflag, ECHOCTL) &&
|
|
((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
|
|
ISSET(c, TTY_CHARMASK) == 0177)) {
|
|
(void)ttyoutput('^', tp);
|
|
CLR(c, ~TTY_CHARMASK);
|
|
if (c == 0177)
|
|
c = '?';
|
|
else
|
|
c += 'A' - 1;
|
|
}
|
|
(void)ttyoutput(c, tp);
|
|
}
|
|
|
|
/*
|
|
* Wake up any readers on a tty.
|
|
*/
|
|
void
|
|
ttwakeup(struct tty *tp)
|
|
{
|
|
|
|
if (SEL_WAITING(&tp->t_rsel))
|
|
selwakeup(&tp->t_rsel);
|
|
if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
|
|
pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
|
|
wakeup(TSA_HUP_OR_INPUT(tp));
|
|
KNOTE(&tp->t_rsel.si_note, 0);
|
|
}
|
|
|
|
/*
|
|
* Wake up any writers on a tty.
|
|
*/
|
|
void
|
|
ttwwakeup(struct tty *tp)
|
|
{
|
|
|
|
if (SEL_WAITING(&tp->t_wsel) && tp->t_outq.c_cc <= tp->t_olowat)
|
|
selwakeup(&tp->t_wsel);
|
|
if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
|
|
pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
|
|
if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
|
|
TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
|
|
CLR(tp->t_state, TS_SO_OCOMPLETE);
|
|
wakeup(TSA_OCOMPLETE(tp));
|
|
}
|
|
if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
|
|
tp->t_outq.c_cc <= tp->t_olowat) {
|
|
CLR(tp->t_state, TS_SO_OLOWAT);
|
|
wakeup(TSA_OLOWAT(tp));
|
|
}
|
|
KNOTE(&tp->t_wsel.si_note, 0);
|
|
}
|
|
|
|
/*
|
|
* Look up a code for a specified speed in a conversion table;
|
|
* used by drivers to map software speed values to hardware parameters.
|
|
*/
|
|
int
|
|
ttspeedtab(int speed, struct speedtab *table)
|
|
{
|
|
|
|
for ( ; table->sp_speed != -1; table++)
|
|
if (table->sp_speed == speed)
|
|
return (table->sp_code);
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Set input and output watermarks and buffer sizes. For input, the
|
|
* high watermark is about one second's worth of input above empty, the
|
|
* low watermark is slightly below high water, and the buffer size is a
|
|
* driver-dependent amount above high water. For output, the watermarks
|
|
* are near the ends of the buffer, with about 1 second's worth of input
|
|
* between them. All this only applies to the standard line discipline.
|
|
*/
|
|
void
|
|
ttsetwater(struct tty *tp)
|
|
{
|
|
int cps, ttmaxhiwat, x;
|
|
|
|
/* Input. */
|
|
clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
|
|
switch (tp->t_ispeedwat) {
|
|
case (speed_t)-1:
|
|
cps = tp->t_ispeed / 10;
|
|
break;
|
|
case 0:
|
|
/*
|
|
* This case is for old drivers that don't know about
|
|
* t_ispeedwat. Arrange for them to get the old buffer
|
|
* sizes and watermarks.
|
|
*/
|
|
cps = TTYHOG - 2 * 256;
|
|
tp->t_ififosize = 2 * 256;
|
|
break;
|
|
default:
|
|
cps = tp->t_ispeedwat / 10;
|
|
break;
|
|
}
|
|
tp->t_ihiwat = cps;
|
|
tp->t_ilowat = 7 * cps / 8;
|
|
x = cps + tp->t_ififosize;
|
|
clist_alloc_cblocks(&tp->t_rawq, x, x);
|
|
|
|
/* Output. */
|
|
switch (tp->t_ospeedwat) {
|
|
case (speed_t)-1:
|
|
cps = tp->t_ospeed / 10;
|
|
ttmaxhiwat = 2 * TTMAXHIWAT;
|
|
break;
|
|
case 0:
|
|
cps = tp->t_ospeed / 10;
|
|
ttmaxhiwat = TTMAXHIWAT;
|
|
break;
|
|
default:
|
|
cps = tp->t_ospeedwat / 10;
|
|
ttmaxhiwat = 8 * TTMAXHIWAT;
|
|
break;
|
|
}
|
|
#define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
|
|
tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
|
|
x += cps;
|
|
x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
|
|
tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
|
|
x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
|
|
x += OBUFSIZ + 100;
|
|
clist_alloc_cblocks(&tp->t_outq, x, x);
|
|
#undef CLAMP
|
|
}
|
|
|
|
/*
|
|
* Report on state of foreground process group.
|
|
*/
|
|
void
|
|
ttyinfo(struct tty *tp)
|
|
{
|
|
struct proc *p, *pick;
|
|
struct timeval utime, stime;
|
|
const char *stmp;
|
|
long ltmp;
|
|
int tmp;
|
|
struct thread *td;
|
|
|
|
if (ttycheckoutq(tp,0) == 0)
|
|
return;
|
|
|
|
/* Print load average. */
|
|
tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
|
|
ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
|
|
|
|
if (tp->t_session == NULL)
|
|
ttyprintf(tp, "not a controlling terminal\n");
|
|
else if (tp->t_pgrp == NULL)
|
|
ttyprintf(tp, "no foreground process group\n");
|
|
else {
|
|
PGRP_LOCK(tp->t_pgrp);
|
|
if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
|
|
PGRP_UNLOCK(tp->t_pgrp);
|
|
ttyprintf(tp, "empty foreground process group\n");
|
|
} else {
|
|
mtx_lock_spin(&sched_lock);
|
|
|
|
/* Pick interesting process. */
|
|
for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist))
|
|
if (proc_compare(pick, p))
|
|
pick = p;
|
|
PGRP_UNLOCK(tp->t_pgrp);
|
|
|
|
td = FIRST_THREAD_IN_PROC(pick);
|
|
if (pick->p_flag & P_KSES) {
|
|
stmp = "KSE" ; /* XXXKSE */
|
|
} else {
|
|
if (td) {
|
|
if (TD_ON_RUNQ(td) ||
|
|
(TD_IS_RUNNING(td))) {
|
|
stmp = "running";
|
|
} else if (TD_ON_LOCK(td)) {
|
|
stmp = td->td_lockname;
|
|
} else if (td->td_wmesg) {
|
|
stmp = td->td_wmesg;
|
|
} else {
|
|
stmp = "iowait";
|
|
}
|
|
} else {
|
|
stmp = "threadless";
|
|
panic("ttyinfo: no thread!?");
|
|
}
|
|
}
|
|
calcru(pick, &utime, &stime, NULL);
|
|
/* XXXKSE The TDS_IWAIT line is Dubious */
|
|
if (pick->p_state == PRS_NEW ||
|
|
(td && (TD_AWAITING_INTR(td))) ||
|
|
pick->p_state == PRS_ZOMBIE) {
|
|
ltmp = 0;
|
|
} else {
|
|
ltmp = pgtok(
|
|
vmspace_resident_count(pick->p_vmspace));
|
|
}
|
|
mtx_unlock_spin(&sched_lock);
|
|
|
|
ttyprintf(tp, " cmd: %s %d [%s%s] ", pick->p_comm,
|
|
pick->p_pid,
|
|
TD_ON_LOCK(td) ? "*" : "",
|
|
stmp);
|
|
|
|
/* Print user time. */
|
|
ttyprintf(tp, "%ld.%02ldu ",
|
|
utime.tv_sec, utime.tv_usec / 10000);
|
|
|
|
/* Print system time. */
|
|
ttyprintf(tp, "%ld.%02lds ",
|
|
(long)stime.tv_sec, stime.tv_usec / 10000);
|
|
|
|
/* Print percentage cpu, resident set size. */
|
|
ttyprintf(tp, "%d%% %ldk\n", tmp / 100, ltmp);
|
|
|
|
}
|
|
}
|
|
tp->t_rocount = 0; /* so pending input will be retyped if BS */
|
|
}
|
|
|
|
/*
|
|
* Returns 1 if p2 is "better" than p1
|
|
*
|
|
* The algorithm for picking the "interesting" process is thus:
|
|
*
|
|
* 1) Only foreground processes are eligible - implied.
|
|
* 2) Runnable processes are favored over anything else. The runner
|
|
* with the highest cpu utilization is picked (p_estcpu). Ties are
|
|
* broken by picking the highest pid.
|
|
* 3) The sleeper with the shortest sleep time is next. With ties,
|
|
* we pick out just "short-term" sleepers (P_SINTR == 0).
|
|
* 4) Further ties are broken by picking the highest pid.
|
|
*/
|
|
#define ISRUN(p, val) \
|
|
do { \
|
|
struct thread *td; \
|
|
val = 0; \
|
|
FOREACH_THREAD_IN_PROC(p, td) { \
|
|
if (TD_ON_RUNQ(td) || \
|
|
TD_IS_RUNNING(td)) { \
|
|
val = 1; \
|
|
break; \
|
|
} \
|
|
} \
|
|
} while (0)
|
|
|
|
#define TESTAB(a, b) ((a)<<1 | (b))
|
|
#define ONLYA 2
|
|
#define ONLYB 1
|
|
#define BOTH 3
|
|
|
|
static int
|
|
proc_compare(struct proc *p1, struct proc *p2)
|
|
{
|
|
|
|
int esta, estb;
|
|
struct ksegrp *kg;
|
|
mtx_assert(&sched_lock, MA_OWNED);
|
|
if (p1 == NULL)
|
|
return (1);
|
|
|
|
ISRUN(p1, esta);
|
|
ISRUN(p2, estb);
|
|
|
|
/*
|
|
* see if at least one of them is runnable
|
|
*/
|
|
switch (TESTAB(esta, estb)) {
|
|
case ONLYA:
|
|
return (0);
|
|
case ONLYB:
|
|
return (1);
|
|
case BOTH:
|
|
/*
|
|
* tie - favor one with highest recent cpu utilization
|
|
*/
|
|
esta = estb = 0;
|
|
FOREACH_KSEGRP_IN_PROC(p1,kg) {
|
|
esta += kg->kg_estcpu;
|
|
}
|
|
FOREACH_KSEGRP_IN_PROC(p2,kg) {
|
|
estb += kg->kg_estcpu;
|
|
}
|
|
if (estb > esta)
|
|
return (1);
|
|
if (esta > estb)
|
|
return (0);
|
|
return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
|
|
}
|
|
/*
|
|
* weed out zombies
|
|
*/
|
|
switch (TESTAB(p1->p_state == PRS_ZOMBIE, p2->p_state == PRS_ZOMBIE)) {
|
|
case ONLYA:
|
|
return (1);
|
|
case ONLYB:
|
|
return (0);
|
|
case BOTH:
|
|
return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
|
|
}
|
|
|
|
#if 0 /* XXXKSE */
|
|
/*
|
|
* pick the one with the smallest sleep time
|
|
*/
|
|
if (p2->p_slptime > p1->p_slptime)
|
|
return (0);
|
|
if (p1->p_slptime > p2->p_slptime)
|
|
return (1);
|
|
/*
|
|
* favor one sleeping in a non-interruptible sleep
|
|
*/
|
|
if (p1->p_sflag & PS_SINTR && (p2->p_sflag & PS_SINTR) == 0)
|
|
return (1);
|
|
if (p2->p_sflag & PS_SINTR && (p1->p_sflag & PS_SINTR) == 0)
|
|
return (0);
|
|
#endif
|
|
return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
|
|
}
|
|
|
|
/*
|
|
* Output char to tty; console putchar style.
|
|
*/
|
|
int
|
|
tputchar(int c, struct tty *tp)
|
|
{
|
|
int s;
|
|
|
|
s = spltty();
|
|
if (!ISSET(tp->t_state, TS_CONNECTED)) {
|
|
splx(s);
|
|
return (-1);
|
|
}
|
|
if (c == '\n')
|
|
(void)ttyoutput('\r', tp);
|
|
(void)ttyoutput(c, tp);
|
|
ttstart(tp);
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Sleep on chan, returning ERESTART if tty changed while we napped and
|
|
* returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
|
|
* the tty is revoked, restarting a pending call will redo validation done
|
|
* at the start of the call.
|
|
*/
|
|
int
|
|
ttysleep(struct tty *tp, void *chan, int pri, char *wmesg, int timo)
|
|
{
|
|
int error;
|
|
int gen;
|
|
|
|
gen = tp->t_gen;
|
|
error = tsleep(chan, pri, wmesg, timo);
|
|
if (error)
|
|
return (error);
|
|
return (tp->t_gen == gen ? 0 : ERESTART);
|
|
}
|
|
|
|
/*
|
|
* Allocate a tty struct. Clists in the struct will be allocated by
|
|
* ttyopen().
|
|
*/
|
|
struct tty *
|
|
ttymalloc(struct tty *tp)
|
|
{
|
|
|
|
if (tp)
|
|
return(tp);
|
|
tp = malloc(sizeof *tp, M_TTYS, M_ZERO);
|
|
ttyregister(tp);
|
|
return (tp);
|
|
}
|
|
|
|
#if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */
|
|
/*
|
|
* Free a tty struct. Clists in the struct should have been freed by
|
|
* ttyclose().
|
|
*/
|
|
void
|
|
ttyfree(struct tty *tp)
|
|
{
|
|
free(tp, M_TTYS);
|
|
}
|
|
#endif /* 0 */
|
|
|
|
void
|
|
ttyregister(struct tty *tp)
|
|
{
|
|
tp->t_timeout = -1;
|
|
SLIST_INSERT_HEAD(&tty_list, tp, t_list);
|
|
}
|
|
|
|
static int
|
|
sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct tty *tp;
|
|
struct xtty xt;
|
|
int error;
|
|
|
|
SLIST_FOREACH(tp, &tty_list, t_list) {
|
|
bzero(&xt, sizeof xt);
|
|
xt.xt_size = sizeof xt;
|
|
#define XT_COPY(field) xt.xt_##field = tp->t_##field
|
|
xt.xt_rawcc = tp->t_rawq.c_cc;
|
|
xt.xt_cancc = tp->t_canq.c_cc;
|
|
xt.xt_outcc = tp->t_outq.c_cc;
|
|
XT_COPY(line);
|
|
if (tp->t_dev)
|
|
xt.xt_dev = dev2udev(tp->t_dev);
|
|
XT_COPY(state);
|
|
XT_COPY(flags);
|
|
XT_COPY(timeout);
|
|
if (tp->t_pgrp)
|
|
xt.xt_pgid = tp->t_pgrp->pg_id;
|
|
if (tp->t_session)
|
|
xt.xt_sid = tp->t_session->s_sid;
|
|
XT_COPY(termios);
|
|
XT_COPY(winsize);
|
|
XT_COPY(column);
|
|
XT_COPY(rocount);
|
|
XT_COPY(rocol);
|
|
XT_COPY(ififosize);
|
|
XT_COPY(ihiwat);
|
|
XT_COPY(ilowat);
|
|
XT_COPY(ispeedwat);
|
|
XT_COPY(ohiwat);
|
|
XT_COPY(olowat);
|
|
XT_COPY(ospeedwat);
|
|
#undef XT_COPY
|
|
error = SYSCTL_OUT(req, &xt, sizeof xt);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
|
|
0, 0, sysctl_kern_ttys, "S,xtty", "All ttys");
|
|
SYSCTL_LONG(_kern, OID_AUTO, tty_nin, CTLFLAG_RD,
|
|
&tk_nin, 0, "Total TTY in characters");
|
|
SYSCTL_LONG(_kern, OID_AUTO, tty_nout, CTLFLAG_RD,
|
|
&tk_nout, 0, "Total TTY out characters");
|
|
|
|
void
|
|
nottystop(struct tty *tp, int rw)
|
|
{
|
|
|
|
return;
|
|
}
|
|
|
|
int
|
|
ttyread(dev_t dev, struct uio *uio, int flag)
|
|
{
|
|
struct tty *tp;
|
|
|
|
tp = dev->si_tty;
|
|
if (tp == NULL)
|
|
return (ENODEV);
|
|
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
|
|
}
|
|
|
|
int
|
|
ttywrite(dev_t dev, struct uio *uio, int flag)
|
|
{
|
|
struct tty *tp;
|
|
|
|
tp = dev->si_tty;
|
|
if (tp == NULL)
|
|
return (ENODEV);
|
|
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
|
|
}
|