908 lines
22 KiB
C
908 lines
22 KiB
C
/*
|
|
* Copyright (c) 2006 Robert N. M. Watson
|
|
* Copyright (c) 2006 Olivier Houchard
|
|
* Copyright (c) 2003 Networks Associates Technology, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This software was developed for the FreeBSD Project in part by Network
|
|
* Associates Laboratories, the Security Research Division of Network
|
|
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
|
|
* as part of the DARPA CHATS research program.
|
|
*
|
|
* Copyright (c) 1982, 1986, 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* Pseudo-teletype Driver
|
|
* (Actually two drivers, requiring two entries in 'cdevsw')
|
|
*/
|
|
#include "opt_compat.h"
|
|
#include "opt_tty.h"
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/sx.h>
|
|
#if defined(COMPAT_43TTY)
|
|
#include <sys/ioctl_compat.h>
|
|
#endif
|
|
#include <sys/proc.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/tty.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/filio.h>
|
|
|
|
static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
|
|
|
|
static void ptsstart(struct tty *tp);
|
|
static void ptsstop(struct tty *tp, int rw);
|
|
static void ptcwakeup(struct tty *tp, int flag);
|
|
|
|
static d_open_t ptsopen;
|
|
static d_close_t ptsclose;
|
|
static d_read_t ptsread;
|
|
static d_write_t ptswrite;
|
|
static d_ioctl_t ptsioctl;
|
|
static d_ioctl_t ptcioctl;
|
|
static d_open_t ptcopen;
|
|
static d_close_t ptcclose;
|
|
static d_read_t ptcread;
|
|
static d_write_t ptcwrite;
|
|
static d_poll_t ptcpoll;
|
|
|
|
static struct cdevsw pts_cdevsw = {
|
|
.d_version = D_VERSION,
|
|
.d_open = ptsopen,
|
|
.d_close = ptsclose,
|
|
.d_read = ptsread,
|
|
.d_write = ptswrite,
|
|
.d_ioctl = ptsioctl,
|
|
.d_poll = ttypoll,
|
|
.d_name = "pts",
|
|
.d_flags = D_TTY | D_NEEDGIANT,
|
|
.d_kqfilter = ttykqfilter,
|
|
};
|
|
|
|
static struct cdevsw ptc_cdevsw = {
|
|
.d_version = D_VERSION,
|
|
.d_open = ptcopen,
|
|
.d_close = ptcclose,
|
|
.d_read = ptcread,
|
|
.d_write = ptcwrite,
|
|
.d_ioctl = ptcioctl,
|
|
.d_poll = ptcpoll,
|
|
.d_name = "ptc",
|
|
.d_flags = D_TTY | D_NEEDGIANT,
|
|
.d_kqfilter = ttykqfilter,
|
|
};
|
|
|
|
#define BUFSIZ 100 /* Chunk size iomoved to/from user */
|
|
|
|
#define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf)
|
|
#define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl)
|
|
#define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq)
|
|
|
|
#define NUM_TO_MINOR(c) ((c & 0xff) | ((c & ~0xff) << 16))
|
|
/*-
|
|
* Once a tty is allocated, it cannot (currently) be freed. As such,
|
|
* we keep a global list of ptys that have been used so we can recycle
|
|
* them. Another list is provided for released pts, which are
|
|
* not currently allocated, permitting reuse. pt_flags holds state
|
|
* associated with a particular session, so isn't overloaded for this.
|
|
* When a pty descriptor is unused, its number is set to -1 giving
|
|
* more consistent and traditional allocation orders to pty numbers.
|
|
*
|
|
* Locking: (p) indicates that the field is locked by the global pt_mtx.
|
|
* (c) indicates the value is constant after allocation. Other fields
|
|
* await tty locking generally, and are protected by Giant.
|
|
*/
|
|
struct pt_desc {
|
|
int pt_num; /* (c) pty number */
|
|
LIST_ENTRY(pt_desc) pt_list; /* (p) global pty list */
|
|
|
|
int pt_flags;
|
|
struct selinfo pt_selr, pt_selw;
|
|
u_char pt_send;
|
|
u_char pt_ucntl;
|
|
struct tty *pt_tty;
|
|
struct cdev *pt_devs, *pt_devc;
|
|
int pt_pts_open, pt_ptc_open;
|
|
struct prison *pt_prison;
|
|
};
|
|
|
|
static struct mtx pt_mtx;
|
|
static LIST_HEAD(,pt_desc) pt_list;
|
|
static LIST_HEAD(,pt_desc) pt_free_list;
|
|
|
|
#define PF_PKT 0x008 /* packet mode */
|
|
#define PF_STOPPED 0x010 /* user told stopped */
|
|
#define PF_NOSTOP 0x040
|
|
#define PF_UCNTL 0x080 /* user control mode */
|
|
|
|
static unsigned int next_avail_nb;
|
|
|
|
static int use_pts = 0;
|
|
|
|
static unsigned int max_pts = 1000;
|
|
|
|
static unsigned int nb_allocated;
|
|
|
|
TUNABLE_INT("kern.pts.enable", &use_pts);
|
|
|
|
SYSCTL_NODE(_kern, OID_AUTO, pts, CTLFLAG_RD, 0, "pts");
|
|
|
|
SYSCTL_INT(_kern_pts, OID_AUTO, enable, CTLFLAG_RW, &use_pts, 0,
|
|
"enable pts");
|
|
|
|
SYSCTL_INT(_kern_pts, OID_AUTO, max, CTLFLAG_RW, &max_pts, 0, "max pts");
|
|
|
|
/*
|
|
* If there's a free pty descriptor in the pty descriptor list, retrieve it.
|
|
* Otherwise, allocate a new one, initialize it, and hook it up. If there's
|
|
* not a tty number, reject.
|
|
*/
|
|
static struct pt_desc *
|
|
pty_new(void)
|
|
{
|
|
struct pt_desc *pt;
|
|
int nb;
|
|
|
|
mtx_lock(&pt_mtx);
|
|
if (nb_allocated >= max_pts || nb_allocated == 0xffffff) {
|
|
mtx_unlock(&pt_mtx);
|
|
return (NULL);
|
|
}
|
|
nb_allocated++;
|
|
pt = LIST_FIRST(&pt_free_list);
|
|
if (pt) {
|
|
LIST_REMOVE(pt, pt_list);
|
|
LIST_INSERT_HEAD(&pt_list, pt, pt_list);
|
|
mtx_unlock(&pt_mtx);
|
|
} else {
|
|
nb = next_avail_nb++;
|
|
mtx_unlock(&pt_mtx);
|
|
pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
|
|
mtx_lock(&pt_mtx);
|
|
pt->pt_num = nb;
|
|
LIST_INSERT_HEAD(&pt_list, pt, pt_list);
|
|
mtx_unlock(&pt_mtx);
|
|
pt->pt_tty = ttyalloc();
|
|
}
|
|
return (pt);
|
|
}
|
|
|
|
/*
|
|
* Release a pty descriptor back to the pool for reuse. The pty number
|
|
* remains allocated.
|
|
*/
|
|
static void
|
|
pty_release(struct pt_desc *pt)
|
|
{
|
|
|
|
KASSERT(pt->pt_ptc_open == 0 && pt->pt_pts_open == 0,
|
|
("pty_release: pts/%d freed while open\n", pt->pt_num));
|
|
KASSERT(pt->pt_devs == NULL && pt->pt_devc == NULL,
|
|
("pty_release: pts/%d freed whith non-null struct cdev\n", pt->pt_num));
|
|
mtx_assert(&pt_mtx, MA_OWNED);
|
|
nb_allocated--;
|
|
LIST_REMOVE(pt, pt_list);
|
|
LIST_INSERT_HEAD(&pt_free_list, pt, pt_list);
|
|
}
|
|
|
|
/*
|
|
* Given a pty descriptor, if both endpoints are closed, release all
|
|
* resources and destroy the device nodes to flush file system level
|
|
* state for the tty (owner, avoid races, etc).
|
|
*/
|
|
static void
|
|
pty_maybecleanup(struct pt_desc *pt)
|
|
{
|
|
|
|
if (pt->pt_ptc_open || pt->pt_pts_open)
|
|
return;
|
|
|
|
if (pt->pt_tty->t_refcnt > 1)
|
|
return;
|
|
|
|
if (bootverbose)
|
|
printf("destroying pty %d\n", pt->pt_num);
|
|
|
|
destroy_dev(pt->pt_devs);
|
|
destroy_dev(pt->pt_devc);
|
|
pt->pt_devs = pt->pt_devc = NULL;
|
|
pt->pt_tty->t_dev = NULL;
|
|
ttyrel(pt->pt_tty);
|
|
pt->pt_tty = NULL;
|
|
|
|
mtx_lock(&pt_mtx);
|
|
pty_release(pt);
|
|
mtx_unlock(&pt_mtx);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td)
|
|
{
|
|
struct tty *tp;
|
|
int error;
|
|
struct pt_desc *pt;
|
|
|
|
pt = dev->si_drv1;
|
|
tp = dev->si_tty;
|
|
if ((tp->t_state & TS_ISOPEN) == 0)
|
|
ttyinitmode(tp, 1, 0);
|
|
else if (tp->t_state & TS_XCLUDE && suser(td)) {
|
|
return (EBUSY);
|
|
} else if (pt->pt_prison != td->td_ucred->cr_prison && suser(td)) {
|
|
return (EBUSY);
|
|
}
|
|
if (tp->t_oproc) /* Ctrlr still around. */
|
|
ttyld_modem(tp, 1);
|
|
while ((tp->t_state & TS_CARR_ON) == 0) {
|
|
if (flag & FNONBLOCK)
|
|
break;
|
|
error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
|
|
"ptsopn", 0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
error = ttyld_open(tp, dev);
|
|
if (error == 0) {
|
|
ptcwakeup(tp, FREAD|FWRITE);
|
|
pt->pt_pts_open = 1;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ptsclose(struct cdev *dev, int flag, int mode, struct thread *td)
|
|
{
|
|
struct pt_desc *pt = dev->si_drv1;
|
|
struct tty *tp;
|
|
int err;
|
|
|
|
tp = dev->si_tty;
|
|
err = ttyld_close(tp, flag);
|
|
ptsstop(tp, FREAD|FWRITE);
|
|
(void) tty_close(tp);
|
|
pt->pt_pts_open = 0;
|
|
pty_maybecleanup(pt);
|
|
return (err);
|
|
}
|
|
|
|
static int
|
|
ptsread(struct cdev *dev, struct uio *uio, int flag)
|
|
{
|
|
struct tty *tp = dev->si_tty;
|
|
int error = 0;
|
|
|
|
if (tp->t_oproc)
|
|
error = ttyld_read(tp, uio, flag);
|
|
ptcwakeup(tp, FWRITE);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Write to pseudo-tty.
|
|
* Wakeups of controlling tty will happen
|
|
* indirectly, when tty driver calls ptsstart.
|
|
*/
|
|
static int
|
|
ptswrite(struct cdev *dev, struct uio *uio, int flag)
|
|
{
|
|
struct tty *tp;
|
|
|
|
tp = dev->si_tty;
|
|
if (tp->t_oproc == 0)
|
|
return (EIO);
|
|
return (ttyld_write(tp, uio, flag));
|
|
}
|
|
|
|
/*
|
|
* Start output on pseudo-tty.
|
|
* Wake up process selecting or sleeping for input from controlling tty.
|
|
*/
|
|
static void
|
|
ptsstart(struct tty *tp)
|
|
{
|
|
struct pt_desc *pt = tp->t_dev->si_drv1;
|
|
|
|
if (tp->t_state & TS_TTSTOP)
|
|
return;
|
|
if (pt->pt_flags & PF_STOPPED) {
|
|
pt->pt_flags &= ~PF_STOPPED;
|
|
pt->pt_send = TIOCPKT_START;
|
|
}
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
|
|
static void
|
|
ptcwakeup(struct tty *tp, int flag)
|
|
{
|
|
struct pt_desc *pt = tp->t_dev->si_drv1;
|
|
|
|
if (flag & FREAD) {
|
|
selwakeup(&pt->pt_selr);
|
|
wakeup(TSA_PTC_READ(tp));
|
|
}
|
|
if (flag & FWRITE) {
|
|
selwakeup(&pt->pt_selw);
|
|
wakeup(TSA_PTC_WRITE(tp));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ptcopen implementes exclusive access to the master/control device
|
|
* as well as creating the slave device based on the credential of the
|
|
* process opening the master. By creating the slave here, we avoid
|
|
* a race to access the master in terms of having a process with access
|
|
* to an incorrectly owned slave, but it does create the possibility
|
|
* that a racing process can cause a ptmx user to get EIO if it gets
|
|
* there first. Consumers of ptmx must look for EIO and retry if it
|
|
* happens. VFS locking may actually prevent this from occurring due
|
|
* to the lookup into devfs holding the vnode lock through open, but
|
|
* it's better to be careful.
|
|
*/
|
|
static int
|
|
ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td)
|
|
{
|
|
struct pt_desc *pt;
|
|
struct tty *tp;
|
|
struct cdev *devs;
|
|
|
|
pt = dev->si_drv1;
|
|
/*
|
|
* In case we have destroyed the struct tty at the last connect time,
|
|
* we need to recreate it.
|
|
*/
|
|
if (pt->pt_tty == NULL) {
|
|
pt->pt_tty = ttyalloc();
|
|
dev->si_tty = pt->pt_tty;
|
|
}
|
|
tp = dev->si_tty;
|
|
if (tp->t_oproc)
|
|
return (EIO);
|
|
|
|
/*
|
|
* XXX: Might want to make the ownership/permissions here more
|
|
* configurable.
|
|
*/
|
|
if (pt->pt_devs)
|
|
devs = pt->pt_devs;
|
|
else
|
|
pt->pt_devs = devs = make_dev_cred(&pts_cdevsw,
|
|
NUM_TO_MINOR(pt->pt_num),
|
|
td->td_ucred, UID_ROOT, GID_WHEEL, 0666, "pts/%d",
|
|
pt->pt_num);
|
|
devs->si_drv1 = pt;
|
|
devs->si_tty = pt->pt_tty;
|
|
pt->pt_tty->t_dev = devs;
|
|
|
|
tp->t_timeout = -1;
|
|
tp->t_oproc = ptsstart;
|
|
tp->t_stop = ptsstop;
|
|
ttyld_modem(tp, 1);
|
|
tp->t_lflag &= ~EXTPROC;
|
|
pt = dev->si_drv1;
|
|
pt->pt_prison = td->td_ucred->cr_prison;
|
|
pt->pt_flags = 0;
|
|
pt->pt_send = 0;
|
|
pt->pt_ucntl = 0;
|
|
pt->pt_ptc_open = 1;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td)
|
|
{
|
|
struct pt_desc *pt = dev->si_drv1;
|
|
struct tty *tp;
|
|
|
|
tp = dev->si_tty;
|
|
ttyld_modem(tp, 0);
|
|
|
|
/*
|
|
* XXX MDMBUF makes no sense for ptys but would inhibit the above
|
|
* l_modem(). CLOCAL makes sense but isn't supported. Special
|
|
* l_modem()s that ignore carrier drop make no sense for ptys but
|
|
* may be in use because other parts of the line discipline make
|
|
* sense for ptys. Recover by doing everything that a normal
|
|
* ttymodem() would have done except for sending a SIGHUP.
|
|
*/
|
|
if (tp->t_state & TS_ISOPEN) {
|
|
tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
|
|
tp->t_state |= TS_ZOMBIE;
|
|
ttyflush(tp, FREAD | FWRITE);
|
|
}
|
|
|
|
tp->t_oproc = 0; /* mark closed */
|
|
pt->pt_ptc_open = 0;
|
|
pty_maybecleanup(pt);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ptcread(struct cdev *dev, struct uio *uio, int flag)
|
|
{
|
|
struct tty *tp = dev->si_tty;
|
|
struct pt_desc *pt = dev->si_drv1;
|
|
char buf[BUFSIZ];
|
|
int error = 0, cc;
|
|
|
|
/*
|
|
* We want to block until the slave
|
|
* is open, and there's something to read;
|
|
* but if we lost the slave or we're NBIO,
|
|
* then return the appropriate error instead.
|
|
*/
|
|
for (;;) {
|
|
if (tp->t_state&TS_ISOPEN) {
|
|
if (pt->pt_flags&PF_PKT && pt->pt_send) {
|
|
error = ureadc((int)pt->pt_send, uio);
|
|
if (error)
|
|
return (error);
|
|
if (pt->pt_send & TIOCPKT_IOCTL) {
|
|
cc = min(uio->uio_resid,
|
|
sizeof(tp->t_termios));
|
|
uiomove(&tp->t_termios, cc, uio);
|
|
}
|
|
pt->pt_send = 0;
|
|
return (0);
|
|
}
|
|
if (pt->pt_flags&PF_UCNTL && pt->pt_ucntl) {
|
|
error = ureadc((int)pt->pt_ucntl, uio);
|
|
if (error)
|
|
return (error);
|
|
pt->pt_ucntl = 0;
|
|
return (0);
|
|
}
|
|
if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
|
|
break;
|
|
}
|
|
if ((tp->t_state & TS_CONNECTED) == 0)
|
|
return (0); /* EOF */
|
|
if (flag & O_NONBLOCK)
|
|
return (EWOULDBLOCK);
|
|
error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
if (pt->pt_flags & (PF_PKT|PF_UCNTL))
|
|
error = ureadc(0, uio);
|
|
while (uio->uio_resid > 0 && error == 0) {
|
|
cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
|
|
if (cc <= 0)
|
|
break;
|
|
error = uiomove(buf, cc, uio);
|
|
}
|
|
ttwwakeup(tp);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
ptsstop(struct tty *tp, int flush)
|
|
{
|
|
struct pt_desc *pt = tp->t_dev->si_drv1;
|
|
int flag;
|
|
|
|
/* note: FLUSHREAD and FLUSHWRITE already ok */
|
|
if (flush == 0) {
|
|
flush = TIOCPKT_STOP;
|
|
pt->pt_flags |= PF_STOPPED;
|
|
} else
|
|
pt->pt_flags &= ~PF_STOPPED;
|
|
pt->pt_send |= flush;
|
|
/* change of perspective */
|
|
flag = 0;
|
|
if (flush & FREAD)
|
|
flag |= FWRITE;
|
|
if (flush & FWRITE)
|
|
flag |= FREAD;
|
|
ptcwakeup(tp, flag);
|
|
}
|
|
|
|
static int
|
|
ptcpoll(struct cdev *dev, int events, struct thread *td)
|
|
{
|
|
struct tty *tp = dev->si_tty;
|
|
struct pt_desc *pt = dev->si_drv1;
|
|
int revents = 0;
|
|
int s;
|
|
|
|
if ((tp->t_state & TS_CONNECTED) == 0)
|
|
return (events &
|
|
(POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM));
|
|
|
|
/*
|
|
* Need to block timeouts (ttrstart).
|
|
*/
|
|
s = spltty();
|
|
|
|
if (events & (POLLIN | POLLRDNORM))
|
|
if ((tp->t_state & TS_ISOPEN) &&
|
|
((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
|
|
((pt->pt_flags & PF_PKT) && pt->pt_send) ||
|
|
((pt->pt_flags & PF_UCNTL) && pt->pt_ucntl)))
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
|
|
if (events & (POLLOUT | POLLWRNORM))
|
|
if (tp->t_state & TS_ISOPEN &&
|
|
(((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
|
|
(tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
|
|
revents |= events & (POLLOUT | POLLWRNORM);
|
|
|
|
if (events & POLLHUP)
|
|
if ((tp->t_state & TS_CARR_ON) == 0)
|
|
revents |= POLLHUP;
|
|
|
|
if (revents == 0) {
|
|
if (events & (POLLIN | POLLRDNORM))
|
|
selrecord(td, &pt->pt_selr);
|
|
|
|
if (events & (POLLOUT | POLLWRNORM))
|
|
selrecord(td, &pt->pt_selw);
|
|
}
|
|
splx(s);
|
|
|
|
return (revents);
|
|
}
|
|
|
|
static int
|
|
ptcwrite(struct cdev *dev, struct uio *uio, int flag)
|
|
{
|
|
struct tty *tp = dev->si_tty;
|
|
u_char *cp = 0;
|
|
int cc = 0;
|
|
u_char locbuf[BUFSIZ];
|
|
int cnt = 0;
|
|
int error = 0;
|
|
|
|
again:
|
|
if ((tp->t_state&TS_ISOPEN) == 0)
|
|
goto block;
|
|
while (uio->uio_resid > 0 || cc > 0) {
|
|
if (cc == 0) {
|
|
cc = min(uio->uio_resid, BUFSIZ);
|
|
cp = locbuf;
|
|
error = uiomove(cp, cc, uio);
|
|
if (error)
|
|
return (error);
|
|
/* check again for safety */
|
|
if ((tp->t_state & TS_ISOPEN) == 0) {
|
|
/* adjust for data copied in but not written */
|
|
uio->uio_resid += cc;
|
|
return (EIO);
|
|
}
|
|
}
|
|
while (cc > 0) {
|
|
if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
|
|
(tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
|
|
wakeup(TSA_HUP_OR_INPUT(tp));
|
|
goto block;
|
|
}
|
|
ttyld_rint(tp, *cp++);
|
|
cnt++;
|
|
cc--;
|
|
}
|
|
cc = 0;
|
|
}
|
|
return (0);
|
|
block:
|
|
/*
|
|
* Come here to wait for slave to open, for space
|
|
* in outq, or space in rawq, or an empty canq.
|
|
*/
|
|
if ((tp->t_state & TS_CONNECTED) == 0) {
|
|
/* adjust for data copied in but not written */
|
|
uio->uio_resid += cc;
|
|
return (EIO);
|
|
}
|
|
if (flag & IO_NDELAY) {
|
|
/* adjust for data copied in but not written */
|
|
uio->uio_resid += cc;
|
|
if (cnt == 0)
|
|
return (EWOULDBLOCK);
|
|
return (0);
|
|
}
|
|
error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
|
|
if (error) {
|
|
/* adjust for data copied in but not written */
|
|
uio->uio_resid += cc;
|
|
return (error);
|
|
}
|
|
goto again;
|
|
}
|
|
|
|
static int
|
|
ptcioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
|
|
{
|
|
struct tty *tp = dev->si_tty;
|
|
struct pt_desc *pt = dev->si_drv1;
|
|
#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
|
|
int ival;
|
|
#endif
|
|
|
|
switch (cmd) {
|
|
|
|
case TIOCGPGRP:
|
|
/*
|
|
* We avoid calling ttioctl on the controller since,
|
|
* in that case, tp must be the controlling terminal.
|
|
*/
|
|
*(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
|
|
return (0);
|
|
|
|
case TIOCPKT:
|
|
if (*(int *)data) {
|
|
if (pt->pt_flags & PF_UCNTL)
|
|
return (EINVAL);
|
|
pt->pt_flags |= PF_PKT;
|
|
} else
|
|
pt->pt_flags &= ~PF_PKT;
|
|
return (0);
|
|
|
|
case TIOCUCNTL:
|
|
if (*(int *)data) {
|
|
if (pt->pt_flags & PF_PKT)
|
|
return (EINVAL);
|
|
pt->pt_flags |= PF_UCNTL;
|
|
} else
|
|
pt->pt_flags &= ~PF_UCNTL;
|
|
return (0);
|
|
case TIOCGPTN:
|
|
*(unsigned int *)data = pt->pt_num;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* The rest of the ioctls shouldn't be called until
|
|
* the slave is open.
|
|
*/
|
|
if ((tp->t_state & TS_ISOPEN) == 0) {
|
|
if (cmd == TIOCGETA) {
|
|
/*
|
|
* TIOCGETA is used by isatty() to make sure it's
|
|
* a tty. Linux openpty() calls isatty() very early,
|
|
* before the slave is opened, so don't actually
|
|
* fill the struct termios, but just let isatty()
|
|
* know it's a tty.
|
|
*/
|
|
return (0);
|
|
}
|
|
if (cmd != FIONBIO && cmd != FIOASYNC)
|
|
return (EAGAIN);
|
|
}
|
|
|
|
switch (cmd) {
|
|
#ifdef COMPAT_43TTY
|
|
case TIOCSETP:
|
|
case TIOCSETN:
|
|
#endif
|
|
case TIOCSETD:
|
|
case TIOCSETA:
|
|
case TIOCSETAW:
|
|
case TIOCSETAF:
|
|
/*
|
|
* IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
|
|
* ttywflush(tp) will hang if there are characters in
|
|
* the outq.
|
|
*/
|
|
ndflush(&tp->t_outq, tp->t_outq.c_cc);
|
|
break;
|
|
|
|
#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
|
|
case _IO('t', 95):
|
|
ival = IOCPARM_IVAL(data);
|
|
data = (caddr_t)&ival;
|
|
/* FALLTHROUGH */
|
|
#endif
|
|
case TIOCSIG:
|
|
if (*(unsigned int *)data >= NSIG ||
|
|
*(unsigned int *)data == 0)
|
|
return(EINVAL);
|
|
if ((tp->t_lflag&NOFLSH) == 0)
|
|
ttyflush(tp, FREAD|FWRITE);
|
|
if (tp->t_pgrp != NULL) {
|
|
PGRP_LOCK(tp->t_pgrp);
|
|
pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
|
|
PGRP_UNLOCK(tp->t_pgrp);
|
|
}
|
|
if ((*(unsigned int *)data == SIGINFO) &&
|
|
((tp->t_lflag&NOKERNINFO) == 0))
|
|
ttyinfo(tp);
|
|
return(0);
|
|
}
|
|
return (ptsioctl(dev, cmd, data, flag, td));
|
|
}
|
|
/*ARGSUSED*/
|
|
static int
|
|
ptsioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
|
|
{
|
|
struct tty *tp = dev->si_tty;
|
|
struct pt_desc *pt = dev->si_drv1;
|
|
u_char *cc = tp->t_cc;
|
|
int stop, error;
|
|
|
|
if (cmd == TIOCEXT) {
|
|
/*
|
|
* When the EXTPROC bit is being toggled, we need
|
|
* to send an TIOCPKT_IOCTL if the packet driver
|
|
* is turned on.
|
|
*/
|
|
if (*(int *)data) {
|
|
if (pt->pt_flags & PF_PKT) {
|
|
pt->pt_send |= TIOCPKT_IOCTL;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
tp->t_lflag |= EXTPROC;
|
|
} else {
|
|
if ((tp->t_lflag & EXTPROC) &&
|
|
(pt->pt_flags & PF_PKT)) {
|
|
pt->pt_send |= TIOCPKT_IOCTL;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
tp->t_lflag &= ~EXTPROC;
|
|
}
|
|
return(0);
|
|
}
|
|
error = ttioctl(tp, cmd, data, flag);
|
|
if (error == ENOTTY) {
|
|
if (pt->pt_flags & PF_UCNTL &&
|
|
(cmd & ~0xff) == UIOCCMD(0)) {
|
|
if (cmd & 0xff) {
|
|
pt->pt_ucntl = (u_char)cmd;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
return (0);
|
|
}
|
|
error = ENOTTY;
|
|
}
|
|
/*
|
|
* If external processing and packet mode send ioctl packet.
|
|
*/
|
|
if ((tp->t_lflag&EXTPROC) && (pt->pt_flags & PF_PKT)) {
|
|
switch(cmd) {
|
|
case TIOCSETA:
|
|
case TIOCSETAW:
|
|
case TIOCSETAF:
|
|
#ifdef COMPAT_43TTY
|
|
case TIOCSETP:
|
|
case TIOCSETN:
|
|
case TIOCSETC:
|
|
case TIOCSLTC:
|
|
case TIOCLBIS:
|
|
case TIOCLBIC:
|
|
case TIOCLSET:
|
|
#endif
|
|
pt->pt_send |= TIOCPKT_IOCTL;
|
|
ptcwakeup(tp, FREAD);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
|
|
&& CCEQ(cc[VSTART], CTRL('q'));
|
|
if (pt->pt_flags & PF_NOSTOP) {
|
|
if (stop) {
|
|
pt->pt_send &= ~TIOCPKT_NOSTOP;
|
|
pt->pt_send |= TIOCPKT_DOSTOP;
|
|
pt->pt_flags &= ~PF_NOSTOP;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
} else {
|
|
if (!stop) {
|
|
pt->pt_send &= ~TIOCPKT_DOSTOP;
|
|
pt->pt_send |= TIOCPKT_NOSTOP;
|
|
pt->pt_flags |= PF_NOSTOP;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Match lookups on /dev/ptmx, find the next free pty (if any), set up
|
|
* the pty descriptor, register it, and return a reference to the master.
|
|
*
|
|
* pts == /dev/pts/xxx (oldstyle: ttyp...)
|
|
* ptc == /dev/pty/xxx (oldstyle: ptyp...)
|
|
*/
|
|
static void
|
|
pty_clone(void *arg, struct ucred *cred, char *name, int namelen,
|
|
struct cdev **dev)
|
|
{
|
|
struct pt_desc *pt;
|
|
struct cdev *devc;
|
|
|
|
if (!use_pts)
|
|
return;
|
|
|
|
if (*dev != NULL)
|
|
return;
|
|
|
|
if (strcmp(name, "ptmx") != 0)
|
|
return;
|
|
|
|
pt = pty_new();
|
|
if (pt == NULL)
|
|
return;
|
|
|
|
/*
|
|
* XXX: Lack of locking here considered worrying. We expose the
|
|
* pts/pty device nodes before they are fully initialized, although
|
|
* Giant likely protects us (unless make_dev blocks...?).
|
|
*
|
|
* XXX: If a process performs a lookup on /dev/ptmx but never an
|
|
* open, we won't GC the device node. We should have a callout
|
|
* sometime later that GC's device instances that were never
|
|
* opened, or some way to tell devfs that "this had better be for
|
|
* an open() or we won't create a device".
|
|
*/
|
|
pt->pt_devc = devc = make_dev_cred(&ptc_cdevsw,
|
|
NUM_TO_MINOR(pt->pt_num), cred, UID_ROOT, GID_WHEEL, 0666,
|
|
"pty/%d", pt->pt_num);
|
|
|
|
dev_ref(devc);
|
|
devc->si_drv1 = pt;
|
|
devc->si_tty = pt->pt_tty;
|
|
*dev = devc;
|
|
|
|
if (bootverbose)
|
|
printf("pty_clone: allocated pty %d to uid %d\n", pt->pt_num,
|
|
cred->cr_ruid);
|
|
|
|
return;
|
|
}
|
|
|
|
static void
|
|
pty_drvinit(void *unused)
|
|
{
|
|
|
|
mtx_init(&pt_mtx, "pt_mtx", NULL, MTX_DEF);
|
|
LIST_INIT(&pt_list);
|
|
LIST_INIT(&pt_free_list);
|
|
EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000);
|
|
}
|
|
|
|
SYSINIT(ptydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,pty_drvinit,NULL)
|