/*
- * Copyright (c) 1997-2006 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1997-2019 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* 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/uio_internal.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
-#include <sys/vnode_internal.h> /* _devfs_setattr() */
-#include <sys/stat.h> /* _devfs_setattr() */
#include <sys/user.h>
#include <sys/signalvar.h>
#include <sys/sysctl.h>
#include <miscfs/devfs/devfs.h>
-#include <miscfs/devfs/devfsdefs.h> /* DEVFS_LOCK()/DEVFS_UNLOCK() */
-
-/* XXX belongs in devfs somewhere - LATER */
-int _devfs_setattr(void *, unsigned short, uid_t, gid_t);
+#include <miscfs/devfs/devfsdefs.h> /* DEVFS_LOCK()/DEVFS_UNLOCK() */
+#include <libkern/section_keywords.h>
+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif
-#define FREE_BSDSTATIC __private_extern__
-#define d_devtotty_t struct tty **
+#include "tty_dev.h"
/*
* Forward declarations
*/
int ptmx_init(int n_ptys);
-static void ptsd_start(struct tty *tp);
-static void ptmx_wakeup(struct tty *tp, int flag);
-FREE_BSDSTATIC d_open_t ptsd_open;
-FREE_BSDSTATIC d_close_t ptsd_close;
-FREE_BSDSTATIC d_read_t ptsd_read;
-FREE_BSDSTATIC d_write_t ptsd_write;
-FREE_BSDSTATIC d_ioctl_t cptyioctl; /* common ioctl */
-FREE_BSDSTATIC d_stop_t ptsd_stop;
-FREE_BSDSTATIC d_reset_t ptsd_reset;
-FREE_BSDSTATIC d_devtotty_t ptydevtotty;
-FREE_BSDSTATIC d_open_t ptmx_open;
-FREE_BSDSTATIC d_close_t ptmx_close;
-FREE_BSDSTATIC d_read_t ptmx_read;
-FREE_BSDSTATIC d_write_t ptmx_write;
-FREE_BSDSTATIC d_stop_t ptmx_stop; /* NO-OP */
-FREE_BSDSTATIC d_reset_t ptmx_reset;
-FREE_BSDSTATIC d_select_t ptmx_select;
-FREE_BSDSTATIC d_select_t ptsd_select;
-
-static int ptmx_major; /* dynamically assigned major number */
-static struct cdevsw ptmx_cdev = {
- ptmx_open, ptmx_close, ptmx_read, ptmx_write,
- cptyioctl, ptmx_stop, ptmx_reset, 0,
- ptmx_select, eno_mmap, eno_strat, eno_getc,
- eno_putc, D_TTY
+static struct ptmx_ioctl *ptmx_get_ioctl(int minor, int open_flag);
+static int ptmx_free_ioctl(int minor, int open_flag);
+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 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 = {
- ptsd_open, ptsd_close, ptsd_read, ptsd_write,
- cptyioctl, ptsd_stop, ptsd_reset, 0,
- ptsd_select, 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
};
-/*
- * XXX Should be devfs function... and use VATTR mechanisms, per
- * XXX vnode_setattr2(); only we maybe can't really get back to the
- * XXX vnode here for cloning devices (but it works for *cloned* devices
- * XXX that are not themselves cloning).
- *
- * Returns: 0 Success
- * namei:???
- * vnode_setattr:???
- */
-int
-_devfs_setattr(void * handle, unsigned short mode, uid_t uid, gid_t gid)
-{
- devdirent_t *direntp = (devdirent_t *)handle;
- devnode_t *devnodep;
- int error = EACCES;
- vfs_context_t ctx = vfs_context_current();;
- struct vnode_attr va;
-
- VATTR_INIT(&va);
- VATTR_SET(&va, va_uid, uid);
- VATTR_SET(&va, va_gid, gid);
- VATTR_SET(&va, va_mode, mode & ALLPERMS);
-
- /*
- * If the TIOCPTYGRANT loses the race with the clone operation because
- * this function is not part of devfs, and therefore can't take the
- * devfs lock to protect the direntp update, then force user space to
- * redrive the grant request.
- */
- if (direntp == NULL || (devnodep = direntp->de_dnp) == NULL) {
- error = ERESTART;
- goto out;
- }
-
- /*
- * Only do this if we are operating on device that doesn't clone
- * each time it's referenced. We perform a lookup on the device
- * to insure we get the right instance. We can't just use the call
- * to devfs_dntovn() to get the vp for the operation, because
- * dn_dvm may not have been initialized.
- */
- if (devnodep->dn_clone == NULL) {
- struct nameidata nd;
- char name[128];
-
- snprintf(name, sizeof(name), "/dev/%s", direntp->de_name);
- NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, CAST_USER_ADDR_T(name), ctx);
- error = namei(&nd);
- if (error)
- goto out;
- error = vnode_setattr(nd.ni_vp, &va, ctx);
- vnode_put(nd.ni_vp);
- nameidone(&nd);
- goto out;
- }
-
-out:
- return(error);
-}
-
-
-
-#define BUFSIZ 100 /* Chunk size iomoved to/from user */
-
/*
* 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,
- &ptmx_max, 0, &sysctl_ptmx_max, "I", "ptmx_max");
-
-
-/*
- * ptmx_ioctl is a pointer to a list of pointers to tty structures which is
- * grown, as necessary, copied, and replaced, but never shrunk. The ioctl
- * structures themselves pointed to from this list come and go as needed.
- */
-struct ptmx_ioctl {
- struct tty *pt_tty; /* pointer to ttymalloc()'ed data */
- int pt_flags;
- struct selinfo pt_selr;
- struct selinfo pt_selw;
- u_char pt_send;
- u_char pt_ucntl;
- void *pt_devhandle; /* cloned slave device handle */
-};
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &ptmx_max, 0, &sysctl_ptmx_max, "I", "ptmx_max");
-#define PF_PKT 0x0008 /* packet mode */
-#define PF_STOPPED 0x0010 /* user told stopped */
-#define PF_REMOTE 0x0020 /* remote and flow controlled input */
-#define PF_NOSTOP 0x0040
-#define PF_UCNTL 0x0080 /* user control mode */
-#define PF_UNLOCKED 0x0100 /* slave unlock (master open resets) */
-#define PF_OPEN_M 0x0200 /* master is open */
-#define PF_OPEN_S 0x0400 /* slave is open */
+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;
int
ptmx_init( __unused int config_count)
*/
/* Get a major number for /dev/ptmx */
- if((ptmx_major = cdevsw_add(-15, &ptmx_cdev)) == -1) {
+ 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) {
+ panic("Failed to set flags on ptmx cdevsw entry.");
}
/* Get a major number for /dev/pts/nnn */
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) {
+ panic("Failed to set flags on ptmx cdevsw entry.");
}
/* 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);
- return (0);
+ DEVFS_CHAR, UID_ROOT, GID_TTY, 0666,
+ ptmx_clone, PTMX_TEMPLATE);
+
+ _ptmx_driver.master = ptmx_major;
+ _ptmx_driver.slave = ptsd_major;
+ _ptmx_driver.fix_7828447 = 1;
+ _ptmx_driver.fix_7070978 = 1;
+#if CONFIG_MACF
+ _ptmx_driver.mac_notify = 1;
+#endif
+ _ptmx_driver.open = &ptmx_get_ioctl;
+ _ptmx_driver.free = &ptmx_free_ioctl;
+ _ptmx_driver.name = &ptmx_get_name;
+ _ptmx_driver.revoke = &ptsd_revoke_knotes;
+ tty_dev_register(&_ptmx_driver);
+
+ 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? */
+ if (minor < 0 || minor >= _state.pis_total) {
+ ttyfree(new_ptmx_ioctl->pt_tty);
+ DEVFS_UNLOCK();
+ FREE(new_ptmx_ioctl, M_TTYS);
+ return NULL;
+ }
+
if (_state.pis_ioctl_list[minor] != NULL) {
ttyfree(new_ptmx_ioctl->pt_tty);
DEVFS_UNLOCK();
FREE(new_ptmx_ioctl, M_TTYS);
/* Special error value so we know to redrive the open, we've been raced */
- return (struct ptmx_ioctl*)-1;
-
+ 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");
}
- } else if (open_flag & PF_OPEN_S) {
- DEVFS_LOCK();
- _state.pis_ioctl_list[minor]->pt_flags |= PF_OPEN_S;
- DEVFS_UNLOCK();
}
- return (_state.pis_ioctl_list[minor]);
+
+ /*
+ * 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 ptmx_ioctl;
}
/*
struct ptmx_ioctl *old_ptmx_ioctl = NULL;
DEVFS_LOCK();
+
+ if (minor < 0 || minor >= _state.pis_total) {
+ DEVFS_UNLOCK();
+ 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++;
}
DEVFS_UNLOCK();
* 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);
-
- /* Don't remove the entry until the devfs slot is free */
- DEVFS_LOCK();
- _state.pis_ioctl_list[ minor] = NULL;
- _state.pis_free++;
- DEVFS_UNLOCK();
}
- return (0); /* Success */
+ return 0; /* Success */
}
+static int
+ptmx_get_name(int minor, char *buffer, size_t size)
+{
+ return snprintf(buffer, size, "/dev/" PTSD_TEMPLATE, minor);
+}
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;
}
-FREE_BSDSTATIC int
-ptsd_open(dev_t dev, int flag, __unused int devtype, __unused proc_t p)
-{
- struct tty *tp;
- struct ptmx_ioctl *pti;
- int error;
-
- if ((pti = ptmx_get_ioctl(minor(dev), 0)) == NULL) {
- return (ENXIO);
- }
- if (!(pti->pt_flags & PF_UNLOCKED)) {
- return (EAGAIN);
- }
+/*
+ * kqueue support.
+ */
+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_qos_s *kev);
+static int ptsd_kqops_process(struct knote *kn, struct kevent_qos_s *kev);
- tp = pti->pt_tty;
- tty_lock(tp);
+SECURITY_READ_ONLY_EARLY(struct filterops) ptsd_kqops = {
+ .f_isfd = 1,
+ /* attach is handled by ptsd_kqfilter -- the dev node must be passed in */
+ .f_detach = ptsd_kqops_detach,
+ .f_event = ptsd_kqops_event,
+ .f_touch = ptsd_kqops_touch,
+ .f_process = ptsd_kqops_process,
+};
- if ((tp->t_state & TS_ISOPEN) == 0) {
- termioschars(&tp->t_termios); /* 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;
- ttsetwater(tp); /* would be done in xxparam() */
- } else if (tp->t_state&TS_XCLUDE && suser(kauth_cred_get(), NULL)) {
- error = EBUSY;
- goto out;
- }
- if (tp->t_oproc) /* Ctrlr still around. */
- (void)(*linesw[tp->t_line].l_modem)(tp, 1);
- while ((tp->t_state & TS_CARR_ON) == 0) {
- if (flag&FNONBLOCK)
- break;
- error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
- "ptsd_opn", 0);
- if (error)
- goto out;
- }
- error = (*linesw[tp->t_line].l_open)(dev, tp);
- /* Successful open; mark as open by the slave */
- pti->pt_flags |= PF_OPEN_S;
- if (error == 0)
- ptmx_wakeup(tp, FREAD|FWRITE);
-out:
- tty_unlock(tp);
- return (error);
-}
+/*
+ * In the normal case, by the time the driver_close() routine is called
+ * on the slave, all knotes have been detached. However in the revoke(2)
+ * case, the driver's close routine is called while there are knotes active
+ * that reference the handlers below. And we have no obvious means to
+ * reach from the driver out to the kqueue's that reference them to get
+ * them to stop.
+ */
-FREE_BSDSTATIC int
-ptsd_close(dev_t dev, int flag, __unused int mode, __unused proc_t p)
+static void
+ptsd_kqops_detach(struct knote *kn)
{
- struct tty *tp;
- struct ptmx_ioctl *pti;
- int err;
+ struct tty *tp = kn->kn_hook;
- /*
- * This is temporary until the VSX conformance tests
- * are fixed. They are hanging with a deadlock
- * where close(ptsd) will not complete without t_timeout set
- */
-#define FIX_VSX_HANG 1
-#ifdef FIX_VSX_HANG
- int save_timeout;
-#endif
- pti = ptmx_get_ioctl(minor(dev), 0);
-
- tp = pti->pt_tty;
tty_lock(tp);
-#ifdef FIX_VSX_HANG
- save_timeout = tp->t_timeout;
- tp->t_timeout = 60;
-#endif
- err = (*linesw[tp->t_line].l_close)(tp, flag);
- ptsd_stop(tp, FREAD|FWRITE);
- (void) ttyclose(tp);
-#ifdef FIX_VSX_HANG
- tp->t_timeout = save_timeout;
-#endif
+ /*
+ * Only detach knotes from open ttys -- ttyclose detaches all knotes
+ * under the lock and unsets TS_ISOPEN.
+ */
+ if (tp->t_state & TS_ISOPEN) {
+ switch (kn->kn_filter) {
+ 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;
+ }
+ }
tty_unlock(tp);
-
- /* unconditional, just like ttyclose() */
- ptmx_free_ioctl(minor(dev), PF_OPEN_S);
-
- return (err);
+ ttyfree(tp);
}
-FREE_BSDSTATIC int
-ptsd_read(dev_t dev, struct uio *uio, int flag)
+static int
+ptsd_kqops_common(struct knote *kn, struct kevent_qos_s *kev, struct tty *tp)
{
- proc_t p = current_proc();
-
- struct tty *tp;
- struct ptmx_ioctl *pti;
- int error = 0;
- struct uthread *ut;
- struct pgrp * pg;
+ int retval = 0;
+ int64_t data = 0;
- pti = ptmx_get_ioctl(minor(dev), 0);
+ TTY_LOCK_OWNED(tp);
- tp = pti->pt_tty;
- tty_lock(tp);
+ switch (kn->kn_filter) {
+ case EVFILT_READ:
+ /*
+ * ttnread can change the tty state,
+ * hence must be done upfront, before any other check.
+ */
+ data = ttnread(tp);
+ retval = (data > 0);
+ break;
- ut = (struct uthread *)get_bsdthread_info(current_thread());
-again:
- if (pti->pt_flags & PF_REMOTE) {
- while (isbackground(p, tp)) {
- if ((p->p_sigignore & sigmask(SIGTTIN)) ||
- (ut->uu_sigmask & sigmask(SIGTTIN)) ||
- p->p_lflag & P_LPPWAIT) {
- error = EIO;
- goto out;
- }
- pg = proc_pgrp(p);
- if (pg == PGRP_NULL) {
- error = EIO;
- goto out;
- }
- /*
- * SAFE: We about to drop the lock ourselves by
- * SAFE: erroring out or sleeping anyway.
- */
- tty_unlock(tp);
- if (pg->pg_jobc == 0) {
- pg_rele(pg);
- tty_lock(tp);
- error = EIO;
- goto out;
- }
- pgsignal(pg, SIGTTIN, 1);
- pg_rele(pg);
- tty_lock(tp);
-
- error = ttysleep(tp, &lbolt, TTIPRI | PCATCH | PTTYBLOCK, "ptsd_bg",
- 0);
- if (error)
- goto out;
- }
- if (tp->t_canq.c_cc == 0) {
- if (flag & IO_NDELAY) {
- error = EWOULDBLOCK;
- goto out;
- }
- error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH,
- "ptsd_in", 0);
- if (error)
- goto out;
- goto again;
- }
- while (tp->t_canq.c_cc > 1 && uio_resid(uio) > 0) {
- int cc;
- char buf[BUFSIZ];
-
- cc = min(uio_resid(uio), BUFSIZ);
- // Don't copy the very last byte
- cc = min(cc, tp->t_canq.c_cc - 1);
- cc = q_to_b(&tp->t_canq, (u_char *)buf, cc);
- error = uiomove(buf, cc, uio);
- if (error)
- break;
+ case EVFILT_WRITE:
+ if ((tp->t_outq.c_cc <= tp->t_lowat) &&
+ (tp->t_state & TS_CONNECTED)) {
+ data = tp->t_outq.c_cn - tp->t_outq.c_cc;
+ retval = 1;
}
- if (tp->t_canq.c_cc == 1)
- (void) getc(&tp->t_canq);
- if (tp->t_canq.c_cc)
- goto out;
- } else
- if (tp->t_oproc)
- error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
- ptmx_wakeup(tp, FWRITE);
-out:
- tty_unlock(tp);
- return (error);
-}
-
-/*
- * Write to pseudo-tty.
- * Wakeups of controlling tty will happen
- * indirectly, when tty driver calls ptsd_start.
- */
-FREE_BSDSTATIC int
-ptsd_write(dev_t dev, struct uio *uio, int flag)
-{
- struct tty *tp;
- struct ptmx_ioctl *pti;
- int error;
-
- pti = ptmx_get_ioctl(minor(dev), 0);
-
- tp = pti->pt_tty;
- tty_lock(tp);
-
- if (tp->t_oproc == 0)
- error = EIO;
- else
- error = (*linesw[tp->t_line].l_write)(tp, uio, flag);
-
- tty_unlock(tp);
- return (error);
-}
-
-/*
- * Start output on pseudo-tty.
- * Wake up process selecting or sleeping for input from controlling tty.
- *
- * t_oproc for this driver; called from within the line discipline
- *
- * Locks: Assumes tp is locked on entry, remains locked on exit
- */
-static void
-ptsd_start(struct tty *tp)
-{
- struct ptmx_ioctl *pti;
-
- pti = ptmx_get_ioctl(minor(tp->t_dev), 0);
+ break;
- if (tp->t_state & TS_TTSTOP)
- goto out;
- if (pti->pt_flags & PF_STOPPED) {
- pti->pt_flags &= ~PF_STOPPED;
- pti->pt_send = TIOCPKT_START;
+ default:
+ panic("ptsd kevent: unexpected filter: %d, kn = %p, tty = %p",
+ kn->kn_filter, kn, tp);
+ break;
}
- ptmx_wakeup(tp, FREAD);
-out:
- return;
-}
-/*
- * Locks: Assumes tty_lock() is held over this call.
- */
-static void
-ptmx_wakeup(struct tty *tp, int flag)
-{
- struct ptmx_ioctl *pti;
-
- pti = ptmx_get_ioctl(minor(tp->t_dev), 0);
-
- if (flag & FREAD) {
- selwakeup(&pti->pt_selr);
- wakeup(TSA_PTC_READ(tp));
+ if (tp->t_state & TS_ZOMBIE) {
+ kn->kn_flags |= EV_EOF;
+ }
+ if (kn->kn_flags & EV_EOF) {
+ retval = 1;
}
- if (flag & FWRITE) {
- selwakeup(&pti->pt_selw);
- wakeup(TSA_PTC_WRITE(tp));
+ if (retval && kev) {
+ knote_fill_kevent(kn, kev, data);
}
+ return retval;
}
-FREE_BSDSTATIC int
-ptmx_open(dev_t dev, __unused int flag, __unused int devtype, __unused proc_t p)
+static int
+ptsd_kqops_event(struct knote *kn, long hint)
{
- struct tty *tp;
- struct ptmx_ioctl *pti;
- int error = 0;
-
- pti = ptmx_get_ioctl(minor(dev), PF_OPEN_M);
- if (pti == NULL) {
- return (ENXIO);
- } else if (pti == (struct ptmx_ioctl*)-1) {
- return (EREDRIVEOPEN);
- }
+ struct tty *tp = kn->kn_hook;
+ int ret;
- tp = pti->pt_tty;
- tty_lock(tp);
+ TTY_LOCK_OWNED(tp);
- /* If master is open OR slave is still draining, pty is still busy */
- if (tp->t_oproc || (tp->t_state & TS_ISOPEN)) {
- tty_unlock(tp);
- /*
- * If master is closed, we are the only reference, so we
- * need to clear the master open bit
- */
- if (!tp->t_oproc)
- ptmx_free_ioctl(minor(dev), PF_OPEN_M);
- error = EBUSY;
- goto err;
+ if (hint & NOTE_REVOKE) {
+ kn->kn_flags |= EV_EOF | EV_ONESHOT;
+ ret = 1;
+ } else {
+ ret = ptsd_kqops_common(kn, NULL, tp);
}
- tp->t_oproc = ptsd_start;
- CLR(tp->t_state, TS_ZOMBIE);
-#ifdef sun4c
- tp->t_stop = ptsd_stop;
-#endif
- (void)(*linesw[tp->t_line].l_modem)(tp, 1);
- tp->t_lflag &= ~EXTPROC;
- tty_unlock(tp);
-err:
- return (error);
+ return ret;
}
-FREE_BSDSTATIC int
-ptmx_close(dev_t dev, __unused int flags, __unused int fmt, __unused proc_t p)
+static int
+ptsd_kqops_touch(struct knote *kn, struct kevent_qos_s *kev)
{
- struct tty *tp;
- struct ptmx_ioctl *pti;
+ struct tty *tp = kn->kn_hook;
+ int ret;
- pti = ptmx_get_ioctl(minor(dev), 0);
-
- tp = pti->pt_tty;
tty_lock(tp);
- (void)(*linesw[tp->t_line].l_modem)(tp, 0);
+ /* accept new kevent state */
+ kn->kn_sfflags = kev->fflags;
+ kn->kn_sdata = kev->data;
- /*
- * 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 */
+ /* recapture fired state of knote */
+ ret = ptsd_kqops_common(kn, NULL, tp);
tty_unlock(tp);
- ptmx_free_ioctl(minor(dev), PF_OPEN_M);
-
- return (0);
+ return ret;
}
-FREE_BSDSTATIC int
-ptmx_read(dev_t dev, struct uio *uio, int flag)
+static int
+ptsd_kqops_process(struct knote *kn, struct kevent_qos_s *kev)
{
- struct tty *tp;
- struct ptmx_ioctl *pti;
- char buf[BUFSIZ];
- int error = 0, cc;
+ struct tty *tp = kn->kn_hook;
+ int ret;
- pti = ptmx_get_ioctl(minor(dev), 0);
-
- tp = pti->pt_tty;
tty_lock(tp);
-
- /*
- * 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 (pti->pt_flags & PF_PKT && pti->pt_send) {
- error = ureadc((int)pti->pt_send, uio);
- if (error)
- goto out;
- if (pti->pt_send & TIOCPKT_IOCTL) {
- cc = min(uio_resid(uio),
- sizeof(tp->t_termios));
- uiomove((caddr_t)&tp->t_termios, cc,
- uio);
- }
- pti->pt_send = 0;
- goto out;
- }
- if (pti->pt_flags & PF_UCNTL && pti->pt_ucntl) {
- error = ureadc((int)pti->pt_ucntl, uio);
- if (error)
- goto out;
- pti->pt_ucntl = 0;
- goto out;
- }
- if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
- break;
- }
- if ((tp->t_state & TS_CONNECTED) == 0)
- goto out; /* EOF */
- if (flag & IO_NDELAY) {
- error = EWOULDBLOCK;
- goto out;
- }
- error = ttysleep(tp, TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptmx_in", 0);
- if (error)
- goto out;
- }
- if (pti->pt_flags & (PF_PKT|PF_UCNTL))
- error = ureadc(0, uio);
- while (uio_resid(uio) > 0 && error == 0) {
- cc = q_to_b(&tp->t_outq, (u_char *)buf, min(uio_resid(uio), BUFSIZ));
- if (cc <= 0)
- break;
- error = uiomove(buf, cc, uio);
- }
- (*linesw[tp->t_line].l_start)(tp);
-
-out:
+ ret = ptsd_kqops_common(kn, kev, tp);
tty_unlock(tp);
- return (error);
-}
-/*
- * Line discipline callback
- *
- * Locks: tty_lock() is assumed held on entry and exit.
- */
-FREE_BSDSTATIC int
-ptsd_stop(struct tty *tp, int flush)
-{
- struct ptmx_ioctl *pti;
- int flag;
-
- pti = ptmx_get_ioctl(minor(tp->t_dev), 0);
-
- /* note: FLUSHREAD and FLUSHWRITE already ok */
- if (flush == 0) {
- flush = TIOCPKT_STOP;
- pti->pt_flags |= PF_STOPPED;
- } else
- pti->pt_flags &= ~PF_STOPPED;
- pti->pt_send |= flush;
- /* change of perspective */
- flag = 0;
- if (flush & FREAD)
- flag |= FWRITE;
- if (flush & FWRITE)
- flag |= FREAD;
- ptmx_wakeup(tp, flag);
-
- return (0);
-}
-
-FREE_BSDSTATIC int
-ptsd_reset(__unused int uban)
-{
- return (0);
+ return ret;
}
-/*
- * Reinput pending characters after state switch
- * call at spltty().
- *
- * XXX Code duplication: static function, should be inlined
- */
-static void
-ttypend(struct tty *tp)
+int
+ptsd_kqfilter(dev_t dev, struct knote *kn)
{
- struct clist tq;
- int c;
-
- CLR(tp->t_lflag, PENDIN);
- SET(tp->t_state, TS_TYPEN);
- tq = tp->t_rawq;
- tp->t_rawq.c_cc = 0;
- tp->t_rawq.c_cf = tp->t_rawq.c_cl = 0;
- while ((c = getc(&tq)) >= 0)
- ttyinput(c, tp);
- CLR(tp->t_state, TS_TYPEN);
-}
+ struct tty *tp = NULL;
+ struct ptmx_ioctl *pti = NULL;
+ int ret;
-/*
- * Must be called at spltty().
- *
- * XXX Code duplication: static function, should be inlined
- */
-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;
+ /* make sure we're talking about the right device type */
+ if (cdevsw[major(dev)].d_open != ptsopen) {
+ knote_set_error(kn, ENODEV);
+ return 0;
}
- return (nread);
-}
-
-int
-ptsd_select(dev_t dev, int rw, void *wql, proc_t p)
-{
- struct ptmx_ioctl *pti;
- struct tty *tp;
- int retval = 0;
- pti = ptmx_get_ioctl(minor(dev), 0);
+ if ((pti = ptmx_get_ioctl(minor(dev), 0)) == NULL) {
+ knote_set_error(kn, ENXIO);
+ return 0;
+ }
tp = pti->pt_tty;
+ tty_lock(tp);
- if (tp == NULL)
- return (ENXIO);
+ assert(tp->t_state & TS_ISOPEN);
- tty_lock(tp);
+ kn->kn_filtid = EVFILTID_PTSD;
+ /* the tty will be freed when detaching the knote */
+ ttyhold(tp);
+ kn->kn_hook = tp;
- switch (rw) {
- case FREAD:
- if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE)) {
- retval = 1;
- break;
- }
- selrecord(p, &tp->t_rsel, wql);
+ switch (kn->kn_filter) {
+ case EVFILT_READ:
+ KNOTE_ATTACH(&tp->t_rsel.si_note, kn);
break;
- case FWRITE:
- if ((tp->t_outq.c_cc <= tp->t_lowat &&
- ISSET(tp->t_state, TS_CONNECTED))
- || ISSET(tp->t_state, TS_ZOMBIE)) {
- retval = 1;
- break;
- }
- selrecord(p, &tp->t_wsel, wql);
+ case EVFILT_WRITE:
+ KNOTE_ATTACH(&tp->t_wsel.si_note, kn);
+ break;
+ default:
+ panic("ptsd kevent: unexpected filter: %d, kn = %p, tty = %p",
+ kn->kn_filter, kn, tp);
break;
}
+ /* capture current event state */
+ ret = ptsd_kqops_common(kn, NULL, tp);
+
tty_unlock(tp);
- return (retval);
+
+ return ret;
}
-FREE_BSDSTATIC int
-ptmx_select(dev_t dev, int rw, void *wql, proc_t p)
+/*
+ * Support for revoke(2).
+ */
+static void
+ptsd_revoke_knotes(__unused int minor, struct tty *tp)
{
- struct tty *tp;
- struct ptmx_ioctl *pti;
- int retval = 0;
-
- pti = ptmx_get_ioctl(minor(dev), 0);
-
- tp = pti->pt_tty;
tty_lock(tp);
- if ((tp->t_state & TS_CONNECTED) == 0) {
- retval = 1;
- goto out;
- }
- switch (rw) {
- case FREAD:
- /*
- * Need to block timeouts (ttrstart).
- */
- if ((tp->t_state&TS_ISOPEN) &&
- tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) {
- retval = 1;
- break;
- }
- /* FALLTHROUGH */
+ ttwakeup(tp);
+ assert((tp->t_rsel.si_flags & SI_KNPOSTING) == 0);
+ KNOTE(&tp->t_rsel.si_note, NOTE_REVOKE);
- case 0: /* exceptional */
- if ((tp->t_state&TS_ISOPEN) &&
- ((pti->pt_flags & PF_PKT && pti->pt_send) ||
- (pti->pt_flags & PF_UCNTL && pti->pt_ucntl))) {
- retval = 1;
- break;
- }
- selrecord(p, &pti->pt_selr, wql);
- break;
+ ttwwakeup(tp);
+ assert((tp->t_wsel.si_flags & SI_KNPOSTING) == 0);
+ KNOTE(&tp->t_wsel.si_note, NOTE_REVOKE);
- case FWRITE:
- if (tp->t_state&TS_ISOPEN) {
- if (pti->pt_flags & PF_REMOTE) {
- if (tp->t_canq.c_cc == 0) {
- retval = 1;
- break;
- }
- } else {
- if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) {
- retval = 1;
- break;
- }
- if (tp->t_canq.c_cc == 0 && (tp->t_lflag&ICANON)) {
- retval = 1;
- break;
- }
- }
- }
- selrecord(p, &pti->pt_selw, wql);
- break;
-
- }
-out:
tty_unlock(tp);
- return (retval);
}
-FREE_BSDSTATIC int
-ptmx_stop(__unused struct tty *tp, __unused int flush)
+/*
+ * 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 (0);
+ return (struct ptmx_ioctl *)kn->kn_hook;
}
-FREE_BSDSTATIC int
-ptmx_reset(__unused int uban)
+static struct tty *
+ptmx_knote_tty(struct knote *kn)
{
- return (0);
+ return ptmx_knote_ioctl(kn)->pt_tty;
}
-FREE_BSDSTATIC int
-ptmx_write(dev_t dev, struct uio *uio, int flag)
+int
+ptmx_kqfilter(dev_t dev, struct knote *kn)
{
- struct tty *tp;
- struct ptmx_ioctl *pti;
- u_char *cp = NULL;
- int cc = 0;
- u_char locbuf[BUFSIZ];
- int wcnt = 0;
- int error = 0;
-
- pti = ptmx_get_ioctl(minor(dev), 0);
-
- tp = pti->pt_tty;
- tty_lock(tp);
+ struct tty *tp = NULL;
+ struct ptmx_ioctl *pti = NULL;
+ int ret;
-again:
- if ((tp->t_state&TS_ISOPEN) == 0)
- goto block;
- if (pti->pt_flags & PF_REMOTE) {
- if (tp->t_canq.c_cc)
- goto block;
- while ((uio_resid(uio) > 0 || cc > 0) &&
- tp->t_canq.c_cc < TTYHOG - 1) {
- if (cc == 0) {
- cc = min(uio_resid(uio), BUFSIZ);
- cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
- cp = locbuf;
- error = uiomove((caddr_t)cp, cc, uio);
- if (error)
- goto out;
- /* check again for safety */
- if ((tp->t_state & TS_ISOPEN) == 0) {
- /* adjust as usual */
- uio_setresid(uio, (uio_resid(uio) + cc));
- error = EIO;
- goto out;
- }
- }
- if (cc > 0) {
- cc = b_to_q((u_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_setresid(uio, (uio_resid(uio) + cc));
- (void) putc(0, &tp->t_canq);
- ttwakeup(tp);
- wakeup(TSA_PTS_READ(tp));
- goto out;
- }
- while (uio_resid(uio) > 0 || cc > 0) {
- if (cc == 0) {
- cc = min(uio_resid(uio), BUFSIZ);
- cp = locbuf;
- error = uiomove((caddr_t)cp, cc, uio);
- if (error)
- goto out;
- /* check again for safety */
- if ((tp->t_state & TS_ISOPEN) == 0) {
- /* adjust for data copied in but not written */
- uio_setresid(uio, (uio_resid(uio) + cc));
- error = EIO;
- goto out;
- }
- }
- 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;
- }
- (*linesw[tp->t_line].l_rint)(*cp++, tp);
- wcnt++;
- cc--;
- }
- cc = 0;
+ /* make sure we're talking about the right device type */
+ if (cdevsw[major(dev)].d_open != ptcopen) {
+ knote_set_error(kn, ENODEV);
+ return 0;
}
-out:
- tty_unlock(tp);
- return (error);
-
-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_setresid(uio, (uio_resid(uio) + cc));
- error = EIO;
- goto out;
- }
- if (flag & IO_NDELAY) {
- /* adjust for data copied in but not written */
- uio_setresid(uio, (uio_resid(uio) + cc));
- if (wcnt == 0)
- error = EWOULDBLOCK;
- goto out;
- }
- error = ttysleep(tp, TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptmx_out", 0);
- if (error) {
- /* adjust for data copied in but not written */
- uio_setresid(uio, (uio_resid(uio) + cc));
- goto out;
+ if ((pti = ptmx_get_ioctl(minor(dev), 0)) == NULL) {
+ knote_set_error(kn, ENXIO);
+ return 0;
}
- goto again;
-}
-
-
-FREE_BSDSTATIC int
-cptyioctl(dev_t dev, u_long cmd, caddr_t data, int flag, proc_t p)
-{
- struct tty *tp;
- struct ptmx_ioctl *pti;
- u_char *cc;
- int stop, error = 0;
-
- pti = ptmx_get_ioctl(minor(dev), 0);
tp = pti->pt_tty;
tty_lock(tp);
- cc = tp->t_cc;
+ kn->kn_filtid = EVFILTID_PTMX;
+ /* the tty will be freed when detaching the knote */
+ ttyhold(tp);
+ kn->kn_hook = pti;
/*
- * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
- * ttywflush(tp) will hang if there are characters in the outq.
+ * 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.
*/
- 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 (pti->pt_flags & PF_PKT) {
- pti->pt_send |= TIOCPKT_IOCTL;
- ptmx_wakeup(tp, FREAD);
- }
- tp->t_lflag |= EXTPROC;
- } else {
- if ((tp->t_lflag & EXTPROC) &&
- (pti->pt_flags & PF_PKT)) {
- pti->pt_send |= TIOCPKT_IOCTL;
- ptmx_wakeup(tp, FREAD);
- }
- tp->t_lflag &= ~EXTPROC;
- }
- goto out;
- } else
- if (cdevsw[major(dev)].d_open == ptmx_open)
- switch (cmd) {
-
- case TIOCGPGRP:
- /*
- * We aviod 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;
- goto out;
-
- case TIOCPKT:
- if (*(int *)data) {
- if (pti->pt_flags & PF_UCNTL) {
- error = EINVAL;
- goto out;
- }
- pti->pt_flags |= PF_PKT;
- } else
- pti->pt_flags &= ~PF_PKT;
- goto out;
-
- case TIOCUCNTL:
- if (*(int *)data) {
- if (pti->pt_flags & PF_PKT) {
- error = EINVAL;
- goto out;
- }
- pti->pt_flags |= PF_UCNTL;
- } else
- pti->pt_flags &= ~PF_UCNTL;
- goto out;
-
- case TIOCREMOTE:
- if (*(int *)data)
- pti->pt_flags |= PF_REMOTE;
- else
- pti->pt_flags &= ~PF_REMOTE;
- ttyflush(tp, FREAD|FWRITE);
- goto out;
-
- case TIOCSETP:
- case TIOCSETN:
- case TIOCSETD:
- case TIOCSETA_32:
- case TIOCSETAW_32:
- case TIOCSETAF_32:
- case TIOCSETA_64:
- case TIOCSETAW_64:
- case TIOCSETAF_64:
- ndflush(&tp->t_outq, tp->t_outq.c_cc);
- break;
-
- case TIOCSIG:
- if (*(unsigned int *)data >= NSIG ||
- *(unsigned int *)data == 0) {
- error = EINVAL;
- goto out;
- }
- if ((tp->t_lflag&NOFLSH) == 0)
- ttyflush(tp, FREAD|FWRITE);
- if ((*(unsigned int *)data == SIGINFO) &&
- ((tp->t_lflag&NOKERNINFO) == 0))
- ttyinfo_locked(tp);
- /*
- * SAFE: All callers drop the lock on return and
- * SAFE: the linesw[] will short circut this call
- * SAFE: if the ioctl() is eaten before the lower
- * SAFE: level code gets to see it.
- */
- tty_unlock(tp);
- tty_pgsignal(tp, *(unsigned int *)data, 1);
- tty_lock(tp);
- goto out;
-
- case TIOCPTYGRANT: /* grantpt(3) */
- /*
- * Change the uid of the slave to that of the calling
- * thread, change the gid of the slave to GID_TTY,
- * change the mode to 0620 (rw--w----).
- */
- {
- error = _devfs_setattr(pti->pt_devhandle, 0620, kauth_getuid(), GID_TTY);
- goto out;
- }
-
- case TIOCPTYGNAME: /* ptsname(3) */
- /*
- * Report the name of the slave device in *data
- * (128 bytes max.). Use the same template string
- * used for calling devfs_make_node() to create it.
- */
- snprintf(data, 128, "/dev/" PTSD_TEMPLATE, minor(dev));
- error = 0;
- goto out;
-
- case TIOCPTYUNLK: /* unlockpt(3) */
- /*
- * Unlock the slave device so that it can be opened.
- */
- pti->pt_flags |= PF_UNLOCKED;
- error = 0;
- goto out;
- }
- error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
- if (error == ENOTTY) {
- error = ttioctl_locked(tp, cmd, data, flag, p);
- if (error == ENOTTY) {
- if (pti->pt_flags & PF_UCNTL && (cmd & ~0xff) == UIOCCMD(0)) {
- /* Process the UIOCMD ioctl group */
- if (cmd & 0xff) {
- pti->pt_ucntl = (u_char)cmd;
- ptmx_wakeup(tp, FREAD);
- }
- error = 0;
- goto out;
- } else if (cmd == TIOCSBRK || cmd == TIOCCBRK) {
- /*
- * POSIX conformance; rdar://3936338
- *
- * Clear ENOTTY in the case of setting or
- * clearing a break failing because pty's
- * don't support break like real serial
- * ports.
- */
- error = 0;
- goto out;
- }
- }
+ 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;
}
- /*
- * If external processing and packet mode send ioctl packet.
- */
- if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
- switch(cmd) {
- case TIOCSETA_32:
- case TIOCSETAW_32:
- case TIOCSETAF_32:
- case TIOCSETA_64:
- case TIOCSETAW_64:
- case TIOCSETAF_64:
- case TIOCSETP:
- case TIOCSETN:
- case TIOCSETC:
- case TIOCSLTC:
- case TIOCLBIS:
- case TIOCLBIC:
- case TIOCLSET:
- pti->pt_send |= TIOCPKT_IOCTL;
- ptmx_wakeup(tp, FREAD);
- default:
- break;
- }
- }
- stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
- && CCEQ(cc[VSTART], CTRL('q'));
- if (pti->pt_flags & PF_NOSTOP) {
- if (stop) {
- pti->pt_send &= ~TIOCPKT_NOSTOP;
- pti->pt_send |= TIOCPKT_DOSTOP;
- pti->pt_flags &= ~PF_NOSTOP;
- ptmx_wakeup(tp, FREAD);
- }
- } else {
- if (!stop) {
- pti->pt_send &= ~TIOCPKT_DOSTOP;
- pti->pt_send |= TIOCPKT_NOSTOP;
- pti->pt_flags |= PF_NOSTOP;
- ptmx_wakeup(tp, FREAD);
- }
- }
-out:
- tty_unlock(tp);
- return (error);
-}
+ /* capture current event state */
+ ret = ptmx_kqops_common(kn, NULL, pti, tp);
-/*
- * kqueue support.
- */
-int ptsd_kqfilter(dev_t, struct knote *);
-static void ptsd_kqops_read_detach(struct knote *);
-static int ptsd_kqops_read_event(struct knote *, long);
-static void ptsd_kqops_write_detach(struct knote *);
-static int ptsd_kqops_write_event(struct knote *, long);
+ tty_unlock(tp);
-static struct filterops ptsd_kqops_read = {
- .f_isfd = 1,
- .f_detach = ptsd_kqops_read_detach,
- .f_event = ptsd_kqops_read_event,
-};
-static struct filterops ptsd_kqops_write = {
- .f_isfd = 1,
- .f_detach = ptsd_kqops_write_detach,
- .f_event = ptsd_kqops_write_event,
-};
+ return ret;
+}
static void
-ptsd_kqops_read_detach(struct knote *kn)
+ptmx_kqops_detach(struct knote *kn)
{
- struct ptmx_ioctl *pti;
- struct tty *tp;
- dev_t dev = (dev_t) kn->kn_hookid;
+ struct ptmx_ioctl *pti = kn->kn_hook;
+ struct tty *tp = pti->pt_tty;
- pti = ptmx_get_ioctl(minor(dev), 0);
- tp = pti->pt_tty;
+ tty_lock(tp);
- if (tp == NULL)
- return;
+ 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_lock(tp);
- KNOTE_DETACH(&tp->t_rsel.si_note, kn);
tty_unlock(tp);
-
- kn->kn_hookid = 0;
+ ttyfree(tp);
}
static int
-ptsd_kqops_read_event(struct knote *kn, long hint)
+ptmx_kqops_common(struct knote *kn, struct kevent_qos_s *kev,
+ struct ptmx_ioctl *pti, struct tty *tp)
{
- struct ptmx_ioctl *pti;
- struct tty *tp;
- dev_t dev = (dev_t) kn->kn_hookid;
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;
- pti = ptmx_get_ioctl(minor(dev), 0);
- tp = pti->pt_tty;
-
- if (tp == NULL)
- return (ENXIO);
-
- if (hint == 0)
- tty_lock(tp);
+ 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;
- kn->kn_data = ttnread(tp);
- if (kn->kn_data > 0) {
- retval = 1;
+ default:
+ panic("ptmx kevent: unexpected filter: %d, kn = %p, tty = %p",
+ kn->kn_filter, kn, tp);
+ break;
}
- if (ISSET(tp->t_state, TS_ZOMBIE)) {
+ /* 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;
+}
- if (hint == 0)
- tty_unlock(tp);
- return (retval);
-}
-static void
-ptsd_kqops_write_detach(struct knote *kn)
+static int
+ptmx_kqops_event(struct knote *kn, long hint)
{
- struct ptmx_ioctl *pti;
- struct tty *tp;
- dev_t dev = (dev_t) kn->kn_hookid;
+ struct ptmx_ioctl *pti = ptmx_knote_ioctl(kn);
+ struct tty *tp = ptmx_knote_tty(kn);
+ int ret;
- pti = ptmx_get_ioctl(minor(dev), 0);
- tp = pti->pt_tty;
-
- if (tp == NULL)
- return;
+ TTY_LOCK_OWNED(tp);
- tty_lock(tp);
- KNOTE_DETACH(&tp->t_wsel.si_note, kn);
- tty_unlock(tp);
+ if (hint & NOTE_REVOKE) {
+ kn->kn_flags |= EV_EOF | EV_ONESHOT;
+ ret = 1;
+ } else {
+ ret = ptmx_kqops_common(kn, NULL, pti, tp);
+ }
- kn->kn_hookid = 0;
+ return ret;
}
static int
-ptsd_kqops_write_event(struct knote *kn, long hint)
+ptmx_kqops_touch(struct knote *kn, struct kevent_qos_s *kev)
{
- struct ptmx_ioctl *pti;
- struct tty *tp;
- dev_t dev = (dev_t) kn->kn_hookid;
- int retval = 0;
+ struct ptmx_ioctl *pti = ptmx_knote_ioctl(kn);
+ struct tty *tp = ptmx_knote_tty(kn);
+ int ret;
- pti = ptmx_get_ioctl(minor(dev), 0);
- tp = pti->pt_tty;
+ tty_lock(tp);
- if (tp == NULL)
- return (ENXIO);
+ /* accept new kevent state */
+ kn->kn_sfflags = kev->fflags;
+ kn->kn_sdata = kev->data;
- if (hint == 0)
- tty_lock(tp);
+ /* recapture fired state of knote */
+ ret = ptmx_kqops_common(kn, NULL, pti, tp);
- if ((tp->t_outq.c_cc <= tp->t_lowat) &&
- ISSET(tp->t_state, TS_CONNECTED)) {
- kn->kn_data = tp->t_outq.c_cn - tp->t_outq.c_cc;
- retval = 1;
- }
-
- if (ISSET(tp->t_state, TS_ZOMBIE)) {
- kn->kn_flags |= EV_EOF;
- retval = 1;
- }
-
- if (hint == 0)
- tty_unlock(tp);
- return (retval);
+ tty_unlock(tp);
+ return ret;
}
-int
-ptsd_kqfilter(dev_t dev, struct knote *kn)
+static int
+ptmx_kqops_process(struct knote *kn, struct kevent_qos_s *kev)
{
- struct tty *tp = NULL;
- struct ptmx_ioctl *pti = NULL;
- int retval = 0;
-
- /* make sure we're talking about the right device type */
- if (cdevsw[major(dev)].d_open != ptsd_open) {
- return (EINVAL);
- }
+ struct ptmx_ioctl *pti = ptmx_knote_ioctl(kn);
+ struct tty *tp = ptmx_knote_tty(kn);
+ int ret;
- if ((pti = ptmx_get_ioctl(minor(dev), 0)) == NULL) {
- return (ENXIO);
- }
-
- tp = pti->pt_tty;
tty_lock(tp);
+ ret = ptmx_kqops_common(kn, kev, pti, tp);
+ tty_unlock(tp);
- kn->kn_hookid = dev;
-
- switch (kn->kn_filter) {
- case EVFILT_READ:
- kn->kn_fop = &ptsd_kqops_read;
- SLIST_INIT(&tp->t_rsel.si_note);
- KNOTE_ATTACH(&tp->t_rsel.si_note, kn);
- break;
- case EVFILT_WRITE:
- kn->kn_fop = &ptsd_kqops_write;
- SLIST_INIT(&tp->t_wsel.si_note);
- KNOTE_ATTACH(&tp->t_wsel.si_note, kn);
- break;
- default:
- retval = EINVAL;
- break;
- }
-
- tty_unlock(tp);
- return (retval);
+ return ret;
}
-
projects / apple / xnu.git / blobdiff