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freebsd-skq/sys/kern/tty_tty.c

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When we use DEVFS, we don't need the /dev/tty pseudo-driver to do more than return ENXIO from its open routine, so most of this file is unneeded. A straight #ifdef'ing would look quite messy, and make the file quite unreadable, so instead I have simply added the DEVFS version of the file at the top, protected by #ifndef NODEVFS. Once we have removed NODEVFS option, we can retain 86 the 86 lines at the top and drop the other 287 lines.
2003-01-19 10:23:47 +00:00
/*-
* Copyright (c) 2003 Poul-Henning Kamp. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
Use __FBSDID().
2003-06-11 00:56:59 +00:00
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
When we use DEVFS, we don't need the /dev/tty pseudo-driver to do more than return ENXIO from its open routine, so most of this file is unneeded. A straight #ifdef'ing would look quite messy, and make the file quite unreadable, so instead I have simply added the DEVFS version of the file at the top, protected by #ifndef NODEVFS. Once we have removed NODEVFS option, we can retain 86 the 86 lines at the top and drop the other 287 lines.
2003-01-19 10:23:47 +00:00
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/proc.h>
Lock Giant and proctree lock around dereferencing p_session->s_ttyvp->v_rdev. Lock cdev mutex too to close the race with tty being freed. Relock clone_drain_lock to prevent the LOR with proctree lock, thus add #include <fs/devfs/devfs_int.h>. Suggested by: tegge Debugging help and testing by: Peter Holm Approved by: re (kensmith)
2007-07-03 17:46:37 +00:00
#include <sys/sx.h>
When we use DEVFS, we don't need the /dev/tty pseudo-driver to do more than return ENXIO from its open routine, so most of this file is unneeded. A straight #ifdef'ing would look quite messy, and make the file quite unreadable, so instead I have simply added the DEVFS version of the file at the top, protected by #ifndef NODEVFS. Once we have removed NODEVFS option, we can retain 86 the 86 lines at the top and drop the other 287 lines.
2003-01-19 10:23:47 +00:00
#include <sys/vnode.h>
Lock Giant and proctree lock around dereferencing p_session->s_ttyvp->v_rdev. Lock cdev mutex too to close the race with tty being freed. Relock clone_drain_lock to prevent the LOR with proctree lock, thus add #include <fs/devfs/devfs_int.h>. Suggested by: tegge Debugging help and testing by: Peter Holm Approved by: re (kensmith)
2007-07-03 17:46:37 +00:00
#include <fs/devfs/devfs.h>
#include <fs/devfs/devfs_int.h>
When we use DEVFS, we don't need the /dev/tty pseudo-driver to do more than return ENXIO from its open routine, so most of this file is unneeded. A straight #ifdef'ing would look quite messy, and make the file quite unreadable, so instead I have simply added the DEVFS version of the file at the top, protected by #ifndef NODEVFS. Once we have removed NODEVFS option, we can retain 86 the 86 lines at the top and drop the other 287 lines.
2003-01-19 10:23:47 +00:00
static d_open_t cttyopen;
static struct cdevsw ctty_cdevsw = {
Device megapatch 4/6: Introduce d_version field in struct cdevsw, this must always be initialized to D_VERSION. Flip sense of D_NOGIANT flag to D_NEEDGIANT, this involves removing four D_NOGIANT flags and adding 145 D_NEEDGIANT flags.
2004-02-21 21:10:55 +00:00
.d_version = D_VERSION,
Gigacommit to improve device-driver source compatibility between branches: Initialize struct cdevsw using C99 sparse initializtion and remove all initializations to default values. This patch is automatically generated and has been tested by compiling LINT with all the fields in struct cdevsw in reverse order on alpha, sparc64 and i386. Approved by: re(scottl)
2003-03-03 12:15:54 +00:00
.d_open = cttyopen,
.d_name = "ctty",
When we use DEVFS, we don't need the /dev/tty pseudo-driver to do more than return ENXIO from its open routine, so most of this file is unneeded. A straight #ifdef'ing would look quite messy, and make the file quite unreadable, so instead I have simply added the DEVFS version of the file at the top, protected by #ifndef NODEVFS. Once we have removed NODEVFS option, we can retain 86 the 86 lines at the top and drop the other 287 lines.
2003-01-19 10:23:47 +00:00
};
Do the dreaded s/dev_t/struct cdev */ Bump __FreeBSD_version accordingly.
2004-06-16 09:47:26 +00:00
static struct cdev *ctty;
When we use DEVFS, we don't need the /dev/tty pseudo-driver to do more than return ENXIO from its open routine, so most of this file is unneeded. A straight #ifdef'ing would look quite messy, and make the file quite unreadable, so instead I have simply added the DEVFS version of the file at the top, protected by #ifndef NODEVFS. Once we have removed NODEVFS option, we can retain 86 the 86 lines at the top and drop the other 287 lines.
2003-01-19 10:23:47 +00:00
static int
Do the dreaded s/dev_t/struct cdev */ Bump __FreeBSD_version accordingly.
2004-06-16 09:47:26 +00:00
cttyopen(struct cdev *dev, int flag, int mode, struct thread *td)
When we use DEVFS, we don't need the /dev/tty pseudo-driver to do more than return ENXIO from its open routine, so most of this file is unneeded. A straight #ifdef'ing would look quite messy, and make the file quite unreadable, so instead I have simply added the DEVFS version of the file at the top, protected by #ifndef NODEVFS. Once we have removed NODEVFS option, we can retain 86 the 86 lines at the top and drop the other 287 lines.
2003-01-19 10:23:47 +00:00
{
return (ENXIO);
}
static void
Merge the dev_clone and dev_clone_cred event handlers into a single event handler, dev_clone, which accepts a credential argument. Implementors of the event can ignore it if they're not interested, and most do. This avoids having multiple event handler types and fall-back/precedence logic in devfs. This changes the kernel API for /dev cloning, and may affect third party packages containg cloning kernel modules. Requested by: phk MFC after: 3 days
2005-08-08 19:55:32 +00:00
ctty_clone(void *arg, struct ucred *cred, char *name, int namelen,
struct cdev **dev)
When we use DEVFS, we don't need the /dev/tty pseudo-driver to do more than return ENXIO from its open routine, so most of this file is unneeded. A straight #ifdef'ing would look quite messy, and make the file quite unreadable, so instead I have simply added the DEVFS version of the file at the top, protected by #ifndef NODEVFS. Once we have removed NODEVFS option, we can retain 86 the 86 lines at the top and drop the other 287 lines.
2003-01-19 10:23:47 +00:00
{
Second half of the dev_t cleanup. The big lines are: NODEV -> NULL NOUDEV -> NODEV udev_t -> dev_t udev2dev() -> findcdev() Various minor adjustments including handling of userland access to kernel space struct cdev etc.
2004-06-17 17:16:53 +00:00
if (*dev != NULL)
When we use DEVFS, we don't need the /dev/tty pseudo-driver to do more than return ENXIO from its open routine, so most of this file is unneeded. A straight #ifdef'ing would look quite messy, and make the file quite unreadable, so instead I have simply added the DEVFS version of the file at the top, protected by #ifndef NODEVFS. Once we have removed NODEVFS option, we can retain 86 the 86 lines at the top and drop the other 287 lines.
2003-01-19 10:23:47 +00:00
return;
if (strcmp(name, "tty"))
return;
Lock Giant and proctree lock around dereferencing p_session->s_ttyvp->v_rdev. Lock cdev mutex too to close the race with tty being freed. Relock clone_drain_lock to prevent the LOR with proctree lock, thus add #include <fs/devfs/devfs_int.h>. Suggested by: tegge Debugging help and testing by: Peter Holm Approved by: re (kensmith)
2007-07-03 17:46:37 +00:00
sx_sunlock(&clone_drain_lock);
sx_slock(&proctree_lock);
sx_slock(&clone_drain_lock);
dev_lock();
Don't dereference null vnode pointer if controling terminal was revoked. Submitted by: "Peter Edwards" <pmedwards@eircom.net>
2003-01-27 16:54:17 +00:00
if (!(curthread->td_proc->p_flag & P_CONTROLT))
*dev = ctty;
else if (curthread->td_proc->p_session->s_ttyvp == NULL)
When we use DEVFS, we don't need the /dev/tty pseudo-driver to do more than return ENXIO from its open routine, so most of this file is unneeded. A straight #ifdef'ing would look quite messy, and make the file quite unreadable, so instead I have simply added the DEVFS version of the file at the top, protected by #ifndef NODEVFS. Once we have removed NODEVFS option, we can retain 86 the 86 lines at the top and drop the other 287 lines.
2003-01-19 10:23:47 +00:00
*dev = ctty;
If /dev/tty gets opened after your controlling terminal has been revoked you can't call tty_clone afterwords. OpenBSD and NetBSD both fail the open call in that case, so we should do so as well. This can be done in ctty_clone by returning with *dev==NULL. Admittedly this causes open to return ENOENT, instead of ENXIO as on the other BSDs, but this way requires the least touching of code. Submitted by: Nate Eldredge <nge@cs.hmc.edu> PR: 83375 MFC: 1 week
2006-09-23 14:44:14 +00:00
else if (curthread->td_proc->p_session->s_ttyvp->v_type == VBAD ||
curthread->td_proc->p_session->s_ttyvp->v_rdev == NULL) {
/* e.g. s_ttyvp was revoked */
Use ctty instead of just returning. ctty just has a simple open that returns ENXIO. Submitted by: jhb
2006-09-27 16:41:15 +00:00
*dev = ctty;
If /dev/tty gets opened after your controlling terminal has been revoked you can't call tty_clone afterwords. OpenBSD and NetBSD both fail the open call in that case, so we should do so as well. This can be done in ctty_clone by returning with *dev==NULL. Admittedly this causes open to return ENOENT, instead of ENXIO as on the other BSDs, but this way requires the least touching of code. Submitted by: Nate Eldredge <nge@cs.hmc.edu> PR: 83375 MFC: 1 week
2006-09-23 14:44:14 +00:00
} else
Don't dereference null vnode pointer if controling terminal was revoked. Submitted by: "Peter Edwards" <pmedwards@eircom.net>
2003-01-27 16:54:17 +00:00
*dev = curthread->td_proc->p_session->s_ttyvp->v_rdev;
Lock Giant and proctree lock around dereferencing p_session->s_ttyvp->v_rdev. Lock cdev mutex too to close the race with tty being freed. Relock clone_drain_lock to prevent the LOR with proctree lock, thus add #include <fs/devfs/devfs_int.h>. Suggested by: tegge Debugging help and testing by: Peter Holm Approved by: re (kensmith)
2007-07-03 17:46:37 +00:00
dev_refl(*dev);
dev_unlock();
sx_sunlock(&proctree_lock);
When we use DEVFS, we don't need the /dev/tty pseudo-driver to do more than return ENXIO from its open routine, so most of this file is unneeded. A straight #ifdef'ing would look quite messy, and make the file quite unreadable, so instead I have simply added the DEVFS version of the file at the top, protected by #ifndef NODEVFS. Once we have removed NODEVFS option, we can retain 86 the 86 lines at the top and drop the other 287 lines.
2003-01-19 10:23:47 +00:00
}
static void
ctty_drvinit(void *unused)
{
EVENTHANDLER_REGISTER(dev_clone, ctty_clone, 0, 1000);
ctty = make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "ctty");
}
In keeping with style(9)'s recommendations on macros, use a ';' after each SYSINIT() macro invocation. This makes a number of lightweight C parsers much happier with the FreeBSD kernel source, including cflow's prcc and lxr. MFC after: 1 month Discussed with: imp, rink
2008-03-16 10:58:09 +00:00
SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,ctty_drvinit,NULL);
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