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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#ifndef _SYS_PTMS_H
#define _SYS_PTMS_H
#ifdef __cplusplus
extern "C" {
#endif
#ifdef _KERNEL
/*
* Structures and definitions supporting the pseudo-terminal drivers. This
* structure is private and should not be used by any applications.
*/
struct pt_ttys {
queue_t *ptm_rdq; /* manager's read queue pointer */
queue_t *pts_rdq; /* subsidiary's read queue pointer */
mblk_t *pt_nullmsg; /* 0-bytes message block for pts close */
pid_t pt_pid; /* process id (for debugging) */
minor_t pt_minor; /* Minor number of this pty */
int pt_refcnt; /* reference count for ptm_rdq/pts_rdq uses */
ushort_t pt_state; /* state of manager/subsidiary pair */
kcondvar_t pt_cv; /* condition variable for exclusive access */
kmutex_t pt_lock; /* Per-element lock */
zoneid_t pt_zoneid; /* Zone membership for this pty */
uid_t pt_ruid; /* Real owner of pty */
gid_t pt_rgid; /* Real group owner of pty */
};
/*
* pt_state values
*/
#define PTLOCK 0x01 /* manager/subsidiary pair is locked */
#define PTMOPEN 0x02 /* manager side is open */
#define PTSOPEN 0x04 /* subsidiary side is open */
#define PTSTTY 0x08 /* subsidiary side is tty */
/*
* Multi-threading primitives.
* Values of pt_refcnt: -1 if a writer is accessing the struct
* 0 if no one is reading or writing
* > 0 equals to the number of readers accessing the struct
*/
#define PT_ENTER_READ(p) { \
mutex_enter(&(p)->pt_lock); \
while ((p)->pt_refcnt < 0) \
cv_wait(&((p)->pt_cv), &(p)->pt_lock); \
(p)->pt_refcnt++; \
mutex_exit(&(p)->pt_lock); \
}
#define PT_ENTER_WRITE(p) { \
mutex_enter(&(p)->pt_lock); \
while ((p)->pt_refcnt != 0) \
cv_wait(&((p)->pt_cv), &(p)->pt_lock); \
(p)->pt_refcnt = -1; \
mutex_exit(&(p)->pt_lock); \
}
#define PT_EXIT_READ(p) { \
mutex_enter(&(p)->pt_lock); \
ASSERT((p)->pt_refcnt > 0); \
if ((--((p)->pt_refcnt)) == 0) \
cv_broadcast(&(p)->pt_cv); \
mutex_exit(&(p)->pt_lock); \
}
#define PT_EXIT_WRITE(p) { \
mutex_enter(&(p)->pt_lock); \
ASSERT((p)->pt_refcnt == -1); \
(p)->pt_refcnt = 0; \
cv_broadcast(&(p)->pt_cv); \
mutex_exit(&(p)->pt_lock); \
}
/*
* ptms_lock and pt_cnt are defined in ptms_conf.c
*/
extern kmutex_t ptms_lock;
extern dev_info_t *pts_dip; /* private copy of devinfo ptr */
extern void ptms_init(void);
extern struct pt_ttys *pt_ttys_alloc(void);
extern void ptms_close(struct pt_ttys *, uint_t);
extern struct pt_ttys *ptms_minor2ptty(minor_t);
extern int ptms_attach_subsidiary(void);
extern int ptms_minor_valid(minor_t ptmin, uid_t *uid, gid_t *gid);
extern int ptms_minor_exists(minor_t ptmin);
extern void ptms_set_owner(minor_t ptmin, uid_t uid, gid_t gid);
extern major_t ptms_subsidiary_attached(void);
#ifdef DEBUG
extern void ptms_log(char *, uint_t);
extern void ptms_logp(char *, uintptr_t);
#define DDBG(a, b) ptms_log(a, b)
#define DDBGP(a, b) ptms_logp(a, b)
#else
#define DDBG(a, b)
#define DDBGP(a, b)
#endif
#endif /* _KERNEL */
typedef struct pt_own {
uid_t pto_ruid;
gid_t pto_rgid;
} pt_own_t;
/*
* IOCTL COMMANDS
*
* ISPTM
* Determines whether the file descriptor is that of an open
* manager device. Return code of zero indicates that the file
* descriptor represents a manager device.
*
* UNLKPT
* Unlocks the manager and subsidiary devices. It returns 0 on
* success. On failure, the errno is set to EINVAL indicating
* that the manager device is not open.
*
* ZONEPT
* Sets the zoneid of the pair of manager and subsidiary devices.
* It returns 0 upon success. Used to force a pty 'into' a zone
* upon zone entry.
*
* PT_OWNER
* Sets uid and gid for subsidiary device. It returns 0 on
* success.
*/
#define ISPTM (('P'<<8)|1) /* query for manager */
#define UNLKPT (('P'<<8)|2) /* unlock manager/subsidiary pair */
#define PTSSTTY (('P'<<8)|3) /* set tty flag */
#define ZONEPT (('P'<<8)|4) /* set zone of manager/subsidiary pair */
#define OWNERPT (('P'<<8)|5) /* set owner/group for subsidiary */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_PTMS_H */
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