/*
- * Copyright (c) 1997-2013 Apple Inc. All rights reserved.
+ * Copyright (c) 1997-2019 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* Pseudo-teletype Driver
* (Actually two drivers, requiring two entries in 'cdevsw')
*/
-#include "pty.h" /* XXX */
+#include "pty.h" /* XXX */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signalvar.h>
#include <sys/sysctl.h>
#include <miscfs/devfs/devfs.h>
-#include <miscfs/devfs/devfsdefs.h> /* DEVFS_LOCK()/DEVFS_UNLOCK() */
+#include <miscfs/devfs/devfsdefs.h> /* DEVFS_LOCK()/DEVFS_UNLOCK() */
#include <libkern/section_keywords.h>
#if CONFIG_MACF
static int ptmx_get_name(int minor, char *buffer, size_t size);
static void ptsd_revoke_knotes(int minor, struct tty *tp);
-extern d_open_t ptsopen;
-extern d_close_t ptsclose;
-extern d_read_t ptsread;
-extern d_write_t ptswrite;
-extern d_ioctl_t ptyioctl;
-extern d_stop_t ptsstop;
-extern d_reset_t ptsreset;
-extern d_select_t ptsselect;
-
-extern d_open_t ptcopen;
-extern d_close_t ptcclose;
-extern d_read_t ptcread;
-extern d_write_t ptcwrite;
-extern d_stop_t ptcstop;
-extern d_reset_t ptcreset;
-extern d_select_t ptcselect;
-
-static int ptmx_major; /* dynamically assigned major number */
-static struct cdevsw ptmx_cdev = {
- ptcopen, ptcclose, ptcread, ptcwrite,
- ptyioctl, ptcstop, ptcreset, 0,
- ptcselect, eno_mmap, eno_strat, eno_getc,
- eno_putc, D_TTY
+extern d_open_t ptsopen;
+extern d_close_t ptsclose;
+extern d_read_t ptsread;
+extern d_write_t ptswrite;
+extern d_ioctl_t ptyioctl;
+extern d_stop_t ptsstop;
+extern d_reset_t ptsreset;
+extern d_select_t ptsselect;
+
+extern d_open_t ptcopen;
+extern d_close_t ptcclose;
+extern d_read_t ptcread;
+extern d_write_t ptcwrite;
+extern d_stop_t ptcstop;
+extern d_reset_t ptcreset;
+extern d_select_t ptcselect;
+
+static int ptmx_major; /* dynamically assigned major number */
+static const struct cdevsw ptmx_cdev = {
+ .d_open = ptcopen,
+ .d_close = ptcclose,
+ .d_read = ptcread,
+ .d_write = ptcwrite,
+ .d_ioctl = ptyioctl,
+ .d_stop = ptcstop,
+ .d_reset = ptcreset,
+ .d_ttys = NULL,
+ .d_select = ptcselect,
+ .d_mmap = eno_mmap,
+ .d_strategy = eno_strat,
+ .d_reserved_1 = eno_getc,
+ .d_reserved_2 = eno_putc,
+ .d_type = D_TTY
};
-static int ptsd_major; /* dynamically assigned major number */
-static struct cdevsw ptsd_cdev = {
- ptsopen, ptsclose, ptsread, ptswrite,
- ptyioctl, ptsstop, ptsreset, 0,
- ptsselect, eno_mmap, eno_strat, eno_getc,
- eno_putc, D_TTY
+static int ptsd_major; /* dynamically assigned major number */
+static const struct cdevsw ptsd_cdev = {
+ .d_open = ptsopen,
+ .d_close = ptsclose,
+ .d_read = ptsread,
+ .d_write = ptswrite,
+ .d_ioctl = ptyioctl,
+ .d_stop = ptsstop,
+ .d_reset = ptsreset,
+ .d_ttys = NULL,
+ .d_select = ptsselect,
+ .d_mmap = eno_mmap,
+ .d_strategy = eno_strat,
+ .d_reserved_1 = eno_getc,
+ .d_reserved_2 = eno_putc,
+ .d_type = D_TTY
};
/*
* ptmx == /dev/ptmx
* ptsd == /dev/pts[0123456789]{3}
*/
-#define PTMX_TEMPLATE "ptmx"
-#define PTSD_TEMPLATE "ttys%03d"
+#define PTMX_TEMPLATE "ptmx"
+#define PTSD_TEMPLATE "ttys%03d"
/*
* System-wide limit on the max number of cloned ptys
*/
-#define PTMX_MAX_DEFAULT 127 /* 128 entries */
-#define PTMX_MAX_HARD 999 /* 1000 entries, due to PTSD_TEMPLATE */
+#define PTMX_MAX_DEFAULT 511 /* 512 entries */
+#define PTMX_MAX_HARD 999 /* 1000 entries, due to PTSD_TEMPLATE */
-static int ptmx_max = PTMX_MAX_DEFAULT; /* default # of clones we allow */
+static int ptmx_max = PTMX_MAX_DEFAULT; /* default # of clones we allow */
/* Range enforcement for the sysctl */
static int
sysctl_ptmx_max(__unused struct sysctl_oid *oidp, __unused void *arg1,
- __unused int arg2, struct sysctl_req *req)
+ __unused int arg2, struct sysctl_req *req)
{
int new_value, changed;
int error = sysctl_io_number(req, ptmx_max, sizeof(int), &new_value, &changed);
if (changed) {
- if (new_value > 0 && new_value <= PTMX_MAX_HARD)
+ if (new_value > 0 && new_value <= PTMX_MAX_HARD) {
ptmx_max = new_value;
- else
+ } else {
error = EINVAL;
+ }
}
- return(error);
+ return error;
}
-SYSCTL_NODE(_kern, KERN_TTY, tty, CTLFLAG_RW|CTLFLAG_LOCKED, 0, "TTY");
+SYSCTL_NODE(_kern, KERN_TTY, tty, CTLFLAG_RW | CTLFLAG_LOCKED, 0, "TTY");
SYSCTL_PROC(_kern_tty, OID_AUTO, ptmx_max,
- CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
- &ptmx_max, 0, &sysctl_ptmx_max, "I", "ptmx_max");
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &ptmx_max, 0, &sysctl_ptmx_max, "I", "ptmx_max");
-static int ptmx_clone(dev_t dev, int minor);
+static int ptmx_clone(dev_t dev, int minor);
static struct tty_dev_t _ptmx_driver;
/* Get a major number for /dev/ptmx */
if ((ptmx_major = cdevsw_add(-15, &ptmx_cdev)) == -1) {
printf("ptmx_init: failed to obtain /dev/ptmx major number\n");
- return (ENOENT);
+ return ENOENT;
}
if (cdevsw_setkqueueok(ptmx_major, &ptmx_cdev, CDEVSW_IS_PTC) == -1) {
if ((ptsd_major = cdevsw_add(-15, &ptsd_cdev)) == -1) {
(void)cdevsw_remove(ptmx_major, &ptmx_cdev);
printf("ptmx_init: failed to obtain /dev/ptmx major number\n");
- return (ENOENT);
+ return ENOENT;
}
if (cdevsw_setkqueueok(ptsd_major, &ptsd_cdev, CDEVSW_IS_PTS) == -1) {
/* Create the /dev/ptmx device {<major>,0} */
(void)devfs_make_node_clone(makedev(ptmx_major, 0),
- DEVFS_CHAR, UID_ROOT, GID_TTY, 0666,
- ptmx_clone, PTMX_TEMPLATE);
+ DEVFS_CHAR, UID_ROOT, GID_TTY, 0666,
+ ptmx_clone, PTMX_TEMPLATE);
_ptmx_driver.master = ptmx_major;
_ptmx_driver.slave = ptsd_major;
_ptmx_driver.revoke = &ptsd_revoke_knotes;
tty_dev_register(&_ptmx_driver);
- return (0);
+ return 0;
}
static struct _ptmx_ioctl_state {
- struct ptmx_ioctl **pis_ioctl_list; /* pointer vector */
- int pis_total; /* total slots */
- int pis_free; /* free slots */
+ struct ptmx_ioctl **pis_ioctl_list; /* pointer vector */
+ int pis_total; /* total slots */
+ int pis_free; /* free slots */
} _state;
-#define PTMX_GROW_VECTOR 16 /* Grow by this many slots at a time */
+#define PTMX_GROW_VECTOR 16 /* Grow by this many slots at a time */
/*
* Given a minor number, return the corresponding structure for that minor
static struct ptmx_ioctl *
ptmx_get_ioctl(int minor, int open_flag)
{
- struct ptmx_ioctl *new_ptmx_ioctl;
+ struct ptmx_ioctl *ptmx_ioctl = NULL;
if (open_flag & PF_OPEN_M) {
+ struct ptmx_ioctl *new_ptmx_ioctl;
+ DEVFS_LOCK();
/*
* If we are about to allocate more memory, but we have
* already hit the administrative limit, then fail the
* snapping to the nearest PTMX_GROW_VECTOR...
*/
if ((_state.pis_total - _state.pis_free) >= ptmx_max) {
- return (NULL);
+ DEVFS_UNLOCK();
+ return NULL;
}
+ DEVFS_UNLOCK();
- MALLOC(new_ptmx_ioctl, struct ptmx_ioctl *, sizeof(struct ptmx_ioctl), M_TTYS, M_WAITOK|M_ZERO);
+ MALLOC(new_ptmx_ioctl, struct ptmx_ioctl *, sizeof(struct ptmx_ioctl), M_TTYS, M_WAITOK | M_ZERO);
if (new_ptmx_ioctl == NULL) {
- return (NULL);
+ return NULL;
}
if ((new_ptmx_ioctl->pt_tty = ttymalloc()) == NULL) {
FREE(new_ptmx_ioctl, M_TTYS);
- return (NULL);
+ return NULL;
}
-
+
/*
* Hold the DEVFS_LOCK() over this whole operation; devfs
* itself does this over malloc/free as well, so this should
* doing so avoids a reallocation race on the minor number.
*/
DEVFS_LOCK();
+
+ /*
+ * Check again to ensure the limit is not reached after initial check
+ * when the lock was dropped momentarily for malloc.
+ */
+ if ((_state.pis_total - _state.pis_free) >= ptmx_max) {
+ ttyfree(new_ptmx_ioctl->pt_tty);
+ DEVFS_UNLOCK();
+ FREE(new_ptmx_ioctl, M_TTYS);
+ return NULL;
+ }
+
/* Need to allocate a larger vector? */
if (_state.pis_free == 0) {
struct ptmx_ioctl **new_pis_ioctl_list;
struct ptmx_ioctl **old_pis_ioctl_list = NULL;
/* Yes. */
- MALLOC(new_pis_ioctl_list, struct ptmx_ioctl **, sizeof(struct ptmx_ioctl *) * (_state.pis_total + PTMX_GROW_VECTOR), M_TTYS, M_WAITOK|M_ZERO);
+ MALLOC(new_pis_ioctl_list, struct ptmx_ioctl **, sizeof(struct ptmx_ioctl *) * (_state.pis_total + PTMX_GROW_VECTOR), M_TTYS, M_WAITOK | M_ZERO);
if (new_pis_ioctl_list == NULL) {
ttyfree(new_ptmx_ioctl->pt_tty);
DEVFS_UNLOCK();
FREE(new_ptmx_ioctl, M_TTYS);
- return (NULL);
+ return NULL;
}
/* If this is not the first time, copy the old over */
_state.pis_ioctl_list = new_pis_ioctl_list;
_state.pis_free += PTMX_GROW_VECTOR;
_state.pis_total += PTMX_GROW_VECTOR;
- if (old_pis_ioctl_list)
+ if (old_pis_ioctl_list) {
FREE(old_pis_ioctl_list, M_TTYS);
+ }
}
/* is minor in range now? */
ttyfree(new_ptmx_ioctl->pt_tty);
DEVFS_UNLOCK();
FREE(new_ptmx_ioctl, M_TTYS);
- return (NULL);
+ return NULL;
}
if (_state.pis_ioctl_list[minor] != NULL) {
/* Special error value so we know to redrive the open, we've been raced */
return (struct ptmx_ioctl*)-1;
-
}
/* Vector is large enough; grab a new ptmx_ioctl */
/* Create the /dev/ttysXXX device {<major>,XXX} */
_state.pis_ioctl_list[minor]->pt_devhandle = devfs_make_node(
- makedev(ptsd_major, minor),
- DEVFS_CHAR, UID_ROOT, GID_TTY, 0620,
- PTSD_TEMPLATE, minor);
+ makedev(ptsd_major, minor),
+ DEVFS_CHAR, UID_ROOT, GID_TTY, 0620,
+ PTSD_TEMPLATE, minor);
if (_state.pis_ioctl_list[minor]->pt_devhandle == NULL) {
printf("devfs_make_node() call failed for ptmx_get_ioctl()!!!!\n");
}
}
- if (minor < 0 || minor >= _state.pis_total) {
- return (NULL);
+ /*
+ * Lock is held here to protect race when the 'pis_ioctl_list' array is
+ * being reallocated to increase its slots.
+ */
+ DEVFS_LOCK();
+ if (minor >= 0 && minor < _state.pis_total) {
+ ptmx_ioctl = _state.pis_ioctl_list[minor];
}
+ DEVFS_UNLOCK();
- return (_state.pis_ioctl_list[minor]);
+ return ptmx_ioctl;
}
/*
if (minor < 0 || minor >= _state.pis_total) {
DEVFS_UNLOCK();
- return (-1);
+ return -1;
}
_state.pis_ioctl_list[minor]->pt_flags &= ~(open_flag);
* a notification on the last close of a device, and we will have
* cleared both the master and the slave open bits in the flags.
*/
- if (!(_state.pis_ioctl_list[minor]->pt_flags & (PF_OPEN_M|PF_OPEN_S))) {
+ if (!(_state.pis_ioctl_list[minor]->pt_flags & (PF_OPEN_M | PF_OPEN_S))) {
/* Mark as free so it can be reallocated later */
- old_ptmx_ioctl = _state.pis_ioctl_list[ minor];
+ old_ptmx_ioctl = _state.pis_ioctl_list[minor];
_state.pis_ioctl_list[minor] = NULL;
_state.pis_free++;
}
* XXX Conditional to be removed when/if tty/pty reference
* XXX counting and mutex implemented.
*/
- if (old_ptmx_ioctl->pt_devhandle != NULL)
+ if (old_ptmx_ioctl->pt_devhandle != NULL) {
devfs_remove(old_ptmx_ioctl->pt_devhandle);
+ }
ttyfree(old_ptmx_ioctl->pt_tty);
FREE(old_ptmx_ioctl, M_TTYS);
}
- return (0); /* Success */
+ return 0; /* Success */
}
static int
if (action == DEVFS_CLONE_ALLOC) {
/* First one */
- if (_state.pis_total == 0)
- return (0);
+ if (_state.pis_total == 0) {
+ return 0;
+ }
/*
* Note: We can add hinting on free slots, if this linear search
* ends up being a performance bottleneck...
*/
- for(i = 0; i < _state.pis_total; i++) {
- if (_state.pis_ioctl_list[ i] == NULL)
+ for (i = 0; i < _state.pis_total; i++) {
+ if (_state.pis_ioctl_list[i] == NULL) {
break;
+ }
}
/*
* XXX explicit return.
*/
- return (i); /* empty slot or next slot */
+ return i; /* empty slot or next slot */
}
- return(-1);
+ return -1;
}
int ptsd_kqfilter(dev_t dev, struct knote *kn);
static void ptsd_kqops_detach(struct knote *);
static int ptsd_kqops_event(struct knote *, long);
-static int ptsd_kqops_touch(struct knote *kn, struct kevent_internal_s *kev);
-static int ptsd_kqops_process(struct knote *kn, struct filt_process_s *data, struct kevent_internal_s *kev);
+static int ptsd_kqops_touch(struct knote *kn, struct kevent_qos_s *kev);
+static int ptsd_kqops_process(struct knote *kn, struct kevent_qos_s *kev);
SECURITY_READ_ONLY_EARLY(struct filterops) ptsd_kqops = {
.f_isfd = 1,
static void
ptsd_kqops_detach(struct knote *kn)
{
- struct tty *tp;
-
- tp = kn->kn_hook;
- assert(tp != NULL);
+ struct tty *tp = kn->kn_hook;
tty_lock(tp);
case EVFILT_READ:
KNOTE_DETACH(&tp->t_rsel.si_note, kn);
break;
-
case EVFILT_WRITE:
KNOTE_DETACH(&tp->t_wsel.si_note, kn);
break;
-
default:
panic("invalid knote %p detach, filter: %d", kn, kn->kn_filter);
break;
}
}
- kn->kn_hook = NULL;
tty_unlock(tp);
-
ttyfree(tp);
}
static int
-ptsd_kqops_common(struct knote *kn, struct tty *tp)
+ptsd_kqops_common(struct knote *kn, struct kevent_qos_s *kev, struct tty *tp)
{
int retval = 0;
+ int64_t data = 0;
TTY_LOCK_OWNED(tp);
switch (kn->kn_filter) {
case EVFILT_READ:
- kn->kn_data = ttnread(tp);
- if (kn->kn_data > 0) {
- retval = 1;
- }
+ /*
+ * ttnread can change the tty state,
+ * hence must be done upfront, before any other check.
+ */
+ data = ttnread(tp);
+ retval = (data > 0);
break;
case EVFILT_WRITE:
if ((tp->t_outq.c_cc <= tp->t_lowat) &&
- (tp->t_state & TS_CONNECTED)) {
- kn->kn_data = tp->t_outq.c_cn - tp->t_outq.c_cc;
+ (tp->t_state & TS_CONNECTED)) {
+ data = tp->t_outq.c_cn - tp->t_outq.c_cc;
retval = 1;
}
break;
default:
panic("ptsd kevent: unexpected filter: %d, kn = %p, tty = %p",
- kn->kn_filter, kn, tp);
+ kn->kn_filter, kn, tp);
break;
}
if (tp->t_state & TS_ZOMBIE) {
kn->kn_flags |= EV_EOF;
+ }
+ if (kn->kn_flags & EV_EOF) {
retval = 1;
}
-
+ if (retval && kev) {
+ knote_fill_kevent(kn, kev, data);
+ }
return retval;
}
{
struct tty *tp = kn->kn_hook;
int ret;
- bool revoked = hint & NOTE_REVOKE;
- hint &= ~NOTE_REVOKE;
- if (!hint) {
- tty_lock(tp);
- }
+ TTY_LOCK_OWNED(tp);
- if (revoked) {
+ if (hint & NOTE_REVOKE) {
kn->kn_flags |= EV_EOF | EV_ONESHOT;
ret = 1;
} else {
- ret = ptsd_kqops_common(kn, tp);
- }
-
- if (!hint) {
- tty_unlock(tp);
+ ret = ptsd_kqops_common(kn, NULL, tp);
}
return ret;
}
static int
-ptsd_kqops_touch(struct knote *kn, struct kevent_internal_s *kev)
+ptsd_kqops_touch(struct knote *kn, struct kevent_qos_s *kev)
{
- struct tty *tp;
+ struct tty *tp = kn->kn_hook;
int ret;
- tp = kn->kn_hook;
-
tty_lock(tp);
/* accept new kevent state */
kn->kn_sfflags = kev->fflags;
kn->kn_sdata = kev->data;
- if ((kn->kn_status & KN_UDATA_SPECIFIC) == 0) {
- kn->kn_udata = kev->udata;
- }
/* recapture fired state of knote */
- ret = ptsd_kqops_common(kn, tp);
+ ret = ptsd_kqops_common(kn, NULL, tp);
tty_unlock(tp);
}
static int
-ptsd_kqops_process(struct knote *kn, __unused struct filt_process_s *data,
- struct kevent_internal_s *kev)
+ptsd_kqops_process(struct knote *kn, struct kevent_qos_s *kev)
{
struct tty *tp = kn->kn_hook;
int ret;
tty_lock(tp);
- ret = ptsd_kqops_common(kn, tp);
- if (ret) {
- *kev = kn->kn_kevent;
- if (kn->kn_flags & EV_CLEAR) {
- kn->kn_fflags = 0;
- kn->kn_data = 0;
- }
- }
+ ret = ptsd_kqops_common(kn, kev, tp);
tty_unlock(tp);
return ret;
break;
default:
panic("ptsd kevent: unexpected filter: %d, kn = %p, tty = %p",
- kn->kn_filter, kn, tp);
+ kn->kn_filter, kn, tp);
break;
}
/* capture current event state */
- ret = ptsd_kqops_common(kn, tp);
+ ret = ptsd_kqops_common(kn, NULL, tp);
tty_unlock(tp);
tty_lock(tp);
ttwakeup(tp);
- KNOTE(&tp->t_rsel.si_note, NOTE_REVOKE | 1 /* the lock is already held */);
+ assert((tp->t_rsel.si_flags & SI_KNPOSTING) == 0);
+ KNOTE(&tp->t_rsel.si_note, NOTE_REVOKE);
ttwwakeup(tp);
- KNOTE(&tp->t_wsel.si_note, NOTE_REVOKE | 1);
+ assert((tp->t_wsel.si_flags & SI_KNPOSTING) == 0);
+ KNOTE(&tp->t_wsel.si_note, NOTE_REVOKE);
+
+ tty_unlock(tp);
+}
+
+/*
+ * kevent filter routines for the master side of a pty, a ptmx.
+ *
+ * Stuff the ptmx_ioctl structure into the hook for ptmx knotes. Use the
+ * embedded tty's lock for synchronization.
+ */
+
+int ptmx_kqfilter(dev_t dev, struct knote *kn);
+static void ptmx_kqops_detach(struct knote *);
+static int ptmx_kqops_event(struct knote *, long);
+static int ptmx_kqops_touch(struct knote *kn, struct kevent_qos_s *kev);
+static int ptmx_kqops_process(struct knote *kn, struct kevent_qos_s *kev);
+static int ptmx_kqops_common(struct knote *kn, struct kevent_qos_s *kev,
+ struct ptmx_ioctl *pti, struct tty *tp);
+
+SECURITY_READ_ONLY_EARLY(struct filterops) ptmx_kqops = {
+ .f_isfd = 1,
+ /* attach is handled by ptmx_kqfilter -- the dev node must be passed in */
+ .f_detach = ptmx_kqops_detach,
+ .f_event = ptmx_kqops_event,
+ .f_touch = ptmx_kqops_touch,
+ .f_process = ptmx_kqops_process,
+};
+
+static struct ptmx_ioctl *
+ptmx_knote_ioctl(struct knote *kn)
+{
+ return (struct ptmx_ioctl *)kn->kn_hook;
+}
+
+static struct tty *
+ptmx_knote_tty(struct knote *kn)
+{
+ return ptmx_knote_ioctl(kn)->pt_tty;
+}
+
+int
+ptmx_kqfilter(dev_t dev, struct knote *kn)
+{
+ struct tty *tp = NULL;
+ struct ptmx_ioctl *pti = NULL;
+ int ret;
+
+ /* make sure we're talking about the right device type */
+ if (cdevsw[major(dev)].d_open != ptcopen) {
+ knote_set_error(kn, ENODEV);
+ return 0;
+ }
+
+ if ((pti = ptmx_get_ioctl(minor(dev), 0)) == NULL) {
+ knote_set_error(kn, ENXIO);
+ return 0;
+ }
+
+ tp = pti->pt_tty;
+ tty_lock(tp);
+
+ kn->kn_filtid = EVFILTID_PTMX;
+ /* the tty will be freed when detaching the knote */
+ ttyhold(tp);
+ kn->kn_hook = pti;
+
+ /*
+ * Attach to the ptmx's selinfo structures. This is the major difference
+ * to the ptsd filtops, which use the selinfo structures in the tty
+ * structure.
+ */
+ switch (kn->kn_filter) {
+ case EVFILT_READ:
+ KNOTE_ATTACH(&pti->pt_selr.si_note, kn);
+ break;
+ case EVFILT_WRITE:
+ KNOTE_ATTACH(&pti->pt_selw.si_note, kn);
+ break;
+ default:
+ panic("ptmx kevent: unexpected filter: %d, kn = %p, tty = %p",
+ kn->kn_filter, kn, tp);
+ break;
+ }
+
+ /* capture current event state */
+ ret = ptmx_kqops_common(kn, NULL, pti, tp);
+
+ tty_unlock(tp);
+
+ return ret;
+}
+
+static void
+ptmx_kqops_detach(struct knote *kn)
+{
+ struct ptmx_ioctl *pti = kn->kn_hook;
+ struct tty *tp = pti->pt_tty;
+
+ tty_lock(tp);
+
+ switch (kn->kn_filter) {
+ case EVFILT_READ:
+ KNOTE_DETACH(&pti->pt_selr.si_note, kn);
+ break;
+ case EVFILT_WRITE:
+ KNOTE_DETACH(&pti->pt_selw.si_note, kn);
+ break;
+ default:
+ panic("invalid knote %p detach, filter: %d", kn, kn->kn_filter);
+ break;
+ }
tty_unlock(tp);
+ ttyfree(tp);
+}
+
+static int
+ptmx_kqops_common(struct knote *kn, struct kevent_qos_s *kev,
+ struct ptmx_ioctl *pti, struct tty *tp)
+{
+ int retval = 0;
+ int64_t data = 0;
+
+ TTY_LOCK_OWNED(tp);
+
+ switch (kn->kn_filter) {
+ case EVFILT_READ:
+ /* there's data on the TTY and it's not stopped */
+ if (tp->t_outq.c_cc && !(tp->t_state & TS_TTSTOP)) {
+ data = tp->t_outq.c_cc;
+ retval = data > 0;
+ } else if (((pti->pt_flags & PF_PKT) && pti->pt_send) ||
+ ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) {
+ retval = 1;
+ }
+ break;
+
+ case EVFILT_WRITE:
+ if (pti->pt_flags & PF_REMOTE) {
+ if (tp->t_canq.c_cc == 0) {
+ retval = TTYHOG - 1;
+ }
+ } else {
+ retval = (TTYHOG - 2) - (tp->t_rawq.c_cc + tp->t_canq.c_cc);
+ if (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)) {
+ retval = 1;
+ }
+ if (retval < 0) {
+ retval = 0;
+ }
+ }
+ break;
+
+ default:
+ panic("ptmx kevent: unexpected filter: %d, kn = %p, tty = %p",
+ kn->kn_filter, kn, tp);
+ break;
+ }
+
+ /* disconnects should force a wakeup (EOF) */
+ if (!(tp->t_state & TS_CONNECTED) || (tp->t_state & TS_ZOMBIE)) {
+ kn->kn_flags |= EV_EOF;
+ }
+ if (kn->kn_flags & EV_EOF) {
+ retval = 1;
+ }
+ if (retval && kev) {
+ knote_fill_kevent(kn, kev, data);
+ }
+ return retval;
+}
+
+static int
+ptmx_kqops_event(struct knote *kn, long hint)
+{
+ struct ptmx_ioctl *pti = ptmx_knote_ioctl(kn);
+ struct tty *tp = ptmx_knote_tty(kn);
+ int ret;
+
+ TTY_LOCK_OWNED(tp);
+
+ if (hint & NOTE_REVOKE) {
+ kn->kn_flags |= EV_EOF | EV_ONESHOT;
+ ret = 1;
+ } else {
+ ret = ptmx_kqops_common(kn, NULL, pti, tp);
+ }
+
+ return ret;
+}
+
+static int
+ptmx_kqops_touch(struct knote *kn, struct kevent_qos_s *kev)
+{
+ struct ptmx_ioctl *pti = ptmx_knote_ioctl(kn);
+ struct tty *tp = ptmx_knote_tty(kn);
+ int ret;
+
+ tty_lock(tp);
+
+ /* accept new kevent state */
+ kn->kn_sfflags = kev->fflags;
+ kn->kn_sdata = kev->data;
+
+ /* recapture fired state of knote */
+ ret = ptmx_kqops_common(kn, NULL, pti, tp);
+
+ tty_unlock(tp);
+
+ return ret;
+}
+
+static int
+ptmx_kqops_process(struct knote *kn, struct kevent_qos_s *kev)
+{
+ struct ptmx_ioctl *pti = ptmx_knote_ioctl(kn);
+ struct tty *tp = ptmx_knote_tty(kn);
+ int ret;
+
+ tty_lock(tp);
+ ret = ptmx_kqops_common(kn, kev, pti, tp);
+ tty_unlock(tp);
+
+ return ret;
}
projects / apple / xnu.git / blobdiff