X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/0c530ab8987f0ae6a1a3d9284f40182b88852816..0a7de7458d150b5d4dffc935ba399be265ef0a1a:/bsd/kern/tty_tty.c
diff --git a/bsd/kern/tty_tty.c b/bsd/kern/tty_tty.c
index fa2a62135..8cbdfaf62 100644
--- a/bsd/kern/tty_tty.c
+++ b/bsd/kern/tty_tty.c
@@ -1,25 +1,30 @@
/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1997-2013 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * @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
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * 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,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
+ * 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@
*/
-/* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
/*-
* Copyright (c) 1982, 1986, 1991, 1993
* The Regents of the University of California. All rights reserved.
@@ -66,174 +71,217 @@
#include <sys/tty.h>
#include <sys/vnode_internal.h>
#include <sys/file_internal.h>
-#ifndef NeXT
-#include <sys/kernel.h>
-#ifdef DEVFS
-#include <sys/devfsext.h>
-#endif /*DEVFS*/
-
-static d_open_t cttyopen;
-static d_read_t cttyread;
-static d_write_t cttywrite;
-static d_ioctl_t cttyioctl;
-static d_select_t cttyselect;
-
-#endif /* !NeXT */
+#include <sys/kauth.h>
/* Forward declarations for cdevsw[] entry */
/* XXX we should consider making these static */
-int cttyopen(dev_t dev, int flag, int mode, struct proc *p);
+int cttyopen(dev_t dev, int flag, int mode, proc_t p);
int cttyread(dev_t dev, struct uio *uio, int flag);
int cttywrite(dev_t dev, struct uio *uio, int flag);
-int cttyioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p);
-int cttyselect(dev_t dev, int flag, void* wql, struct proc *p);
-
-#ifndef NeXT
+int cttyioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, proc_t p);
+int cttyselect(dev_t dev, int flag, void* wql, proc_t p);
+static vnode_t cttyvp(proc_t p);
-#define CDEV_MAJOR 1
-/* Don't make static, fdesc_vnops uses this. */
-struct cdevsw ctty_cdevsw =
- { cttyopen, nullclose, cttyread, cttywrite, /*1*/
- cttyioctl, nullstop, nullreset, nodevtotty,/* tty */
- cttyselect, nommap, NULL, "ctty", NULL, -1 };
-
-#endif /* !NeXT */
-
-#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
-
-/*ARGSUSED*/
int
-cttyopen(__unused dev_t dev, int flag, __unused int mode, struct proc *p)
+cttyopen(dev_t dev, int flag, __unused int mode, proc_t p)
{
- struct vnode *ttyvp = cttyvp(p);
+ vnode_t ttyvp = cttyvp(p);
struct vfs_context context;
- int error;
+ int error = 0;
+ int cttyflag, doclose = 0;
+ struct session *sessp;
- if (ttyvp == NULL)
- return (ENXIO);
+ if (ttyvp == NULL) {
+ return ENXIO;
+ }
- context.vc_proc = p;
+ context.vc_thread = current_thread();
context.vc_ucred = kauth_cred_proc_ref(p);
- error = VNOP_OPEN(ttyvp, flag, &context);
+
+ sessp = proc_session(p);
+ session_lock(sessp);
+ cttyflag = sessp->s_flags & S_CTTYREF;
+ session_unlock(sessp);
+
+ /*
+ * A little hack--this device, used by many processes,
+ * happens to do an open on another device, which can
+ * cause unhappiness if the second-level open blocks indefinitely
+ * (as could be the case if the master side has hung up). Since
+ * we know that this driver doesn't care about the serializing
+ * opens and closes, we can drop the lock. To avoid opencount leak,
+ * open the vnode only for the first time.
+ */
+ if (cttyflag == 0) {
+ devsw_unlock(dev, S_IFCHR);
+ error = VNOP_OPEN(ttyvp, flag, &context);
+ devsw_lock(dev, S_IFCHR);
+
+ if (error) {
+ goto out;
+ }
+
+ /*
+ * If S_CTTYREF is set, some other thread did an open
+ * and was able to set the flag, now perform a close, else
+ * set the flag.
+ */
+ session_lock(sessp);
+ if (cttyflag == (sessp->s_flags & S_CTTYREF)) {
+ sessp->s_flags |= S_CTTYREF;
+ } else {
+ doclose = 1;
+ }
+ session_unlock(sessp);
+
+ /*
+ * We have to take a reference here to make sure a close
+ * gets called during revoke. Note that once a controlling
+ * tty gets opened by this driver, the only way close will
+ * get called is when the session leader , whose controlling
+ * tty is ttyvp, exits and vnode is revoked. We cannot
+ * redirect close from this driver because underlying controlling
+ * terminal might change and close may get redirected to a
+ * wrong vnode causing panic.
+ */
+ if (doclose) {
+ devsw_unlock(dev, S_IFCHR);
+ VNOP_CLOSE(ttyvp, flag, &context);
+ devsw_lock(dev, S_IFCHR);
+ } else {
+ error = vnode_ref(ttyvp);
+ }
+ }
+out:
+ session_rele(sessp);
+
+ vnode_put(ttyvp);
kauth_cred_unref(&context.vc_ucred);
- return (error);
+ return error;
}
-/*ARGSUSED*/
int
cttyread(__unused dev_t dev, struct uio *uio, int flag)
{
- struct proc *p = current_proc();
- register struct vnode *ttyvp = cttyvp(p);
+ vnode_t ttyvp = cttyvp(current_proc());
struct vfs_context context;
int error;
- if (ttyvp == NULL)
- return (EIO);
+ if (ttyvp == NULL) {
+ return EIO;
+ }
- context.vc_proc = p;
+ context.vc_thread = current_thread();
context.vc_ucred = NOCRED;
error = VNOP_READ(ttyvp, uio, flag, &context);
+ vnode_put(ttyvp);
- return (error);
+ return error;
}
-/*ARGSUSED*/
int
cttywrite(__unused dev_t dev, struct uio *uio, int flag)
{
- struct proc *p = current_proc();
- register struct vnode *ttyvp = cttyvp(p);
+ vnode_t ttyvp = cttyvp(current_proc());
struct vfs_context context;
int error;
- if (ttyvp == NULL)
- return (EIO);
+ if (ttyvp == NULL) {
+ return EIO;
+ }
- context.vc_proc = p;
+ context.vc_thread = current_thread();
context.vc_ucred = NOCRED;
error = VNOP_WRITE(ttyvp, uio, flag, &context);
+ vnode_put(ttyvp);
- return (error);
+ return error;
}
-/*ARGSUSED*/
-#ifndef NeXT
-static int
-cttyioctl(dev, cmd, addr, flag, p)
- dev_t dev;
- int cmd;
- caddr_t addr;
- int flag;
- struct proc *p;
-#else
int
-cttyioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag,
- struct proc *p)
-#endif /* !NeXT */
+cttyioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag, proc_t p)
{
- struct vnode *ttyvp = cttyvp(p);
+ vnode_t ttyvp = cttyvp(current_proc());
struct vfs_context context;
+ struct session *sessp;
+ int error = 0;
- if (ttyvp == NULL)
- return (EIO);
- if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */
- return EINVAL; /* to controlling tty -- infinite recursion */
+ if (ttyvp == NULL) {
+ return EIO;
+ }
+ if (cmd == TIOCSCTTY) { /* don't allow controlling tty to be set */
+ error = EINVAL; /* to controlling tty -- infinite recursion */
+ goto out;
+ }
if (cmd == TIOCNOTTY) {
- if (!SESS_LEADER(p)) {
- p->p_flag &= ~P_CONTROLT;
- return (0);
- } else
- return (EINVAL);
+ sessp = proc_session(p);
+ if (!SESS_LEADER(p, sessp)) {
+ OSBitAndAtomic(~((uint32_t)P_CONTROLT), &p->p_flag);
+ if (sessp != SESSION_NULL) {
+ session_rele(sessp);
+ }
+ error = 0;
+ goto out;
+ } else {
+ if (sessp != SESSION_NULL) {
+ session_rele(sessp);
+ }
+ error = EINVAL;
+ goto out;
+ }
}
- context.vc_proc = p;
+ context.vc_thread = current_thread();
context.vc_ucred = NOCRED;
- return (VNOP_IOCTL(ttyvp, cmd, addr, flag, &context));
+ error = VNOP_IOCTL(ttyvp, cmd, addr, flag, &context);
+out:
+ vnode_put(ttyvp);
+ return error;
}
-/*ARGSUSED*/
int
-cttyselect(__unused dev_t dev, int flag, void* wql, struct proc *p)
+cttyselect(__unused dev_t dev, int flag, void* wql, __unused proc_t p)
{
- struct vnode *ttyvp = cttyvp(p);
+ vnode_t ttyvp = cttyvp(current_proc());
struct vfs_context context;
+ int error;
- context.vc_proc = p;
+ context.vc_thread = current_thread();
context.vc_ucred = NOCRED;
- if (ttyvp == NULL)
- return (1); /* try operation to get EOF/failure */
- return (VNOP_SELECT(ttyvp, flag, FREAD|FWRITE, wql, &context));
+ if (ttyvp == NULL) {
+ return 1; /* try operation to get EOF/failure */
+ }
+ error = VNOP_SELECT(ttyvp, flag, FREAD | FWRITE, wql, &context);
+ vnode_put(ttyvp);
+ return error;
}
-#ifndef NeXT
-static ctty_devsw_installed = 0;
-#ifdef DEVFS
-static void *ctty_devfs_token;
-#endif
-
-static void
-ctty_drvinit(void *unused)
+/* This returns vnode with ioref */
+static vnode_t
+cttyvp(proc_t p)
{
- dev_t dev;
-
- if( ! ctty_devsw_installed ) {
- dev = makedev(CDEV_MAJOR,0);
- cdevsw_add(&dev,&ctty_cdevsw,NULL);
- ctty_devsw_installed = 1;
-#ifdef DEVFS
- ctty_devfs_token =
- devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0,
- 0666, "tty");
-#endif
- }
-}
+ vnode_t vp;
+ int vid;
+ struct session *sessp;
-SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
+ sessp = proc_session(p);
+ session_lock(sessp);
+ vp = (p->p_flag & P_CONTROLT ? sessp->s_ttyvp : NULLVP);
+ vid = sessp->s_ttyvid;
+ session_unlock(sessp);
-#endif /* !NeXT */
+ session_rele(sessp);
+
+ if (vp != NULLVP) {
+ /* cannot get an IO reference, return NULLVP */
+ if (vnode_getwithvid(vp, vid) != 0) {
+ vp = NULLVP;
+ }
+ }
+ return vp;
+}