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Bring in a sysv-style pts implementation, as found in the rwatson_pts perforce branch. It works the same as its SysV/linux counterpart : You obtain a fd to the master pseudo terminal by opening /dev/ptmx, which craetes a node for the master as /dev/pty[num] and a node for the slave as /dev/pts/[num].

Browse Source 
It should play nicely with the existing BSD ptys.
By default, the system will use the BSD ptys, one can set the sysctl
kern.pts.enable to 1 to make it use the new pts system.
The max number of pty that can be allocated on a system can be changed with the
sysctl kern.pts.max. It defaults to 1000, and can be increased, but it is not
recommanded, as any pty with a number > 999 won't be handled by whatever uses
utmp(5).
This commit is contained in:
Olivier Houchard 2006-01-26 01:30:34 +00:00
parent 5cd7adbfe3
commit 12af2a0f4f
4 changed files with 1026 additions and 8 deletions
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1
sys/conf/files
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@ -1336,6 +1336,7 @@ kern/tty_compat.c optional compat_43tty
kern/tty_conf.c standard
kern/tty_cons.c standard
kern/tty_pty.c optional pty
kern/tty_pts.c optional pty
kern/tty_subr.c standard
kern/tty_tty.c standard
kern/uipc_accf.c optional inet

970
sys/kern/tty_pts.c Normal file
View File

@ -0,0 +1,970 @@
/*
* 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)
/*-
* 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. An another list is provided for released pts, whiiich 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_REMOTE 0x020 /* remote and flow controlled input */
#define PF_NOSTOP 0x040
#define PF_UCNTL 0x080 /* user control mode */
#define PF_COPEN 0x100 /* control half open */
#define PF_SOPEN 0x200 /* slave half open */
static unsigned int next_avail_nb;
static int use_old_pty = 0;
static unsigned int max_pts = 1000;
static unsigned int nb_allocated;
TUNABLE_INT("kern.pts.enable", &use_old_pty);
SYSCTL_NODE(_kern, OID_AUTO, pts, CTLFLAG_RD, 0, "pts");
SYSCTL_INT(_kern_pts, OID_AUTO, enable, CTLFLAG_RW, &use_old_pty, 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) {
mtx_unlock(&pt_mtx);
return (NULL);
}
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();
}
nb_allocated++;
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 (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;
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) {
ttychars(tp); /* Set up default chars */
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_lflag = TTYDEF_LFLAG;
tp->t_cflag = TTYDEF_CFLAG;
tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
} else if (tp->t_state & TS_XCLUDE && suser(td)) {
return (EBUSY);
} else if (pt->pt_prison != td->td_ucred->cr_prison) {
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 thread *td = curthread;
struct proc *p = td->td_proc;
struct tty *tp = dev->si_tty;
struct pt_desc *pt = dev->si_drv1;
struct pgrp *pg;
int error = 0;
again:
if (pt->pt_flags & PF_REMOTE) {
while (isbackground(p, tp)) {
sx_slock(&proctree_lock);
PROC_LOCK(p);
if (SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTIN) ||
SIGISMEMBER(td->td_sigmask, SIGTTIN) ||
p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) {
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, "ptsbg",
0);
if (error)
return (error);
}
if (tp->t_canq.c_cc == 0) {
if (flag & IO_NDELAY)
return (EWOULDBLOCK);
error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH,
"ptsin", 0);
if (error)
return (error);
goto again;
}
while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
if (ureadc(getc(&tp->t_canq), uio) < 0) {
error = EFAULT;
break;
}
if (tp->t_canq.c_cc == 1)
(void) getc(&tp->t_canq);
if (tp->t_canq.c_cc)
return (error);
} else
if (tp->t_oproc)
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 = dev->si_drv1;
struct tty *tp;
struct cdev *devs;
tp = dev->si_tty;
if (tp->t_oproc)
return (EIO);
/*
* XXX: Might want to make the ownership/permissions here more
* configurable.
*/
pt->pt_devs = devs = make_dev_cred(&pts_cdevsw, 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 & IO_NDELAY)
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 &&
((pt->pt_flags & PF_REMOTE) ?
(tp->t_canq.c_cc == 0) :
((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;
struct pt_desc *pt = dev->si_drv1;
int error = 0;
again:
if ((tp->t_state&TS_ISOPEN) == 0)
goto block;
if (pt->pt_flags & PF_REMOTE) {
if (tp->t_canq.c_cc)
goto block;
while ((uio->uio_resid > 0 || cc > 0) &&
tp->t_canq.c_cc < TTYHOG - 1) {
if (cc == 0) {
cc = min(uio->uio_resid, BUFSIZ);
cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
cp = locbuf;
error = uiomove(cp, cc, uio);
if (error)
return (error);
/* check again for safety */
if ((tp->t_state & TS_ISOPEN) == 0) {
/* adjust as usual */
uio->uio_resid += cc;
return (EIO);
}
}
if (cc > 0) {
cc = b_to_q((char *)cp, cc, &tp->t_canq);
/*
* XXX we don't guarantee that the canq size
* is >= TTYHOG, so the above b_to_q() may
* leave some bytes uncopied. However, space
* is guaranteed for the null terminator if
* we don't fail here since (TTYHOG - 1) is
* not a multiple of CBSIZE.
*/
if (cc > 0)
break;
}
}
/* adjust for data copied in but not written */
uio->uio_resid += cc;
(void) putc(0, &tp->t_canq);
ttwakeup(tp);
wakeup(TSA_PTS_READ(tp));
return (0);
}
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;
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;
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 (*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, 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)

61
sys/kern/tty_pty.c
View File

@ -107,6 +107,7 @@ struct ptsc {
u_char pt_ucntl;
struct tty *pt_tty;
struct cdev *devs, *devc;
int pt_devs_open, pt_devc_open;
struct prison *pt_prison;
};
@ -132,7 +133,6 @@ static char *names = "pqrsPQRS";
static struct cdev *
ptyinit(struct cdev *devc, struct thread *td)
{
struct cdev *devs;
struct ptsc *pt;
int n;
@ -143,19 +143,47 @@ ptyinit(struct cdev *devc, struct thread *td)
devc->si_flags &= ~SI_CHEAPCLONE;
/*
* Initially do not create a slave endpoint.
*/
pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
pt->devs = devs = make_dev_cred(&pts_cdevsw, n, td->td_ucred,
UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32);
pt->devc = devc;
pt->pt_tty = ttyalloc();
pt->pt_tty->t_sc = pt;
devs->si_drv1 = devc->si_drv1 = pt;
devs->si_tty = devc->si_tty = pt->pt_tty;
pt->pt_tty->t_dev = devs;
devc->si_drv1 = pt;
devc->si_tty = pt->pt_tty;
return (devc);
}
static void
pty_create_slave(struct ucred *cred, struct ptsc *pt, int n)
{
pt->devs = make_dev_cred(&pts_cdevsw, n, cred, UID_ROOT, GID_WHEEL,
0666, "tty%c%r", names[n / 32], n % 32);
pt->devs->si_drv1 = pt;
pt->devs->si_tty = pt->pt_tty;
pt->pt_tty->t_dev = pt->devs;
}
static void
pty_destroy_slave(struct ptsc *pt)
{
pt->pt_tty->t_dev = NULL;
destroy_dev(pt->devs);
pt->devs = NULL;
}
static void
pty_maybe_destroy_slave(struct ptsc *pt)
{
if (pt->pt_devc_open == 0 && pt->pt_devs_open == 0)
pty_destroy_slave(pt);
}
/*ARGSUSED*/
static int
ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td)
@ -185,20 +213,32 @@ ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td)
return (error);
}
error = ttyld_open(tp, dev);
if (error == 0)
if (error == 0) {
ptcwakeup(tp, FREAD|FWRITE);
pt->pt_devs_open = 1;
} else
pty_maybe_destroy_slave(pt);
return (error);
}
static int
ptsclose(struct cdev *dev, int flag, int mode, struct thread *td)
{
struct ptsc *pti;
struct tty *tp;
int err;
tp = dev->si_tty;
pti = dev->si_drv1;
KASSERT(dev == pti->devs, ("ptsclose: dev != pti->devs"));
err = ttyld_close(tp, flag);
(void) tty_close(tp);
pti->pt_devs_open = 0;
pty_maybe_destroy_slave(pti);
return (err);
}
@ -286,12 +326,17 @@ ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td)
pt->pt_flags = 0;
pt->pt_send = 0;
pt->pt_ucntl = 0;
pty_create_slave(td->td_ucred, pt, minor(dev));
pt->pt_devc_open = 1;
return (0);
}
static int
ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td)
{
struct ptsc *pti = dev->si_drv1;
struct tty *tp;
tp = dev->si_tty;
@ -312,6 +357,8 @@ ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td)
}
tp->t_oproc = 0; /* mark closed */
pti->pt_devc_open = 0;
pty_maybe_destroy_slave(pti);
return (0);
}

2
sys/sys/ttycom.h
View File

@ -63,7 +63,7 @@ struct winsize {
/* 11-12 obsolete or unused */
#define TIOCEXCL _IO('t', 13) /* set exclusive use of tty */
#define TIOCNXCL _IO('t', 14) /* reset exclusive use of tty */
/* 15 unused */
#define TIOCGPTN _IOR('t', 15, int) /* Get pts number. */
#define TIOCFLUSH _IOW('t', 16, int) /* flush buffers */
/* 17-18 compat */
#define TIOCGETA _IOR('t', 19, struct termios) /* get termios struct */