xref: /titanic_41/usr/src/cmd/ttymon/tmlock.c (revision 7c478bd95313f5f23a4c958a745db2134aa03244)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28 /*	  All Rights Reserved  	*/
29 
30 
31 #pragma ident	"%Z%%M%	%I%	%E% SMI"
32 
33 #include	<unistd.h>
34 #include	<string.h>
35 #include	<sys/termios.h>
36 /*--------------------------------------------------------- */
37 /* the follwing are here so we can use routines in ulockf.c */
38 int	Debug = 0;
39 char	*Bnptr;
40 /* dummies for using uucp .o routines */
41 /*VARARGS*/
42 /*ARGSUSED*/
43 void
assert(char * s1,char * s2,int i1,char * s3,int i2)44 assert(char *s1, char *s2, int i1, char *s3, int i2)
45 {}
46 
47 void
cleanup()48 cleanup(){}
49 
50 /*ARGSUSED*/
51 void
logent(char * s1,char * s2)52 logent(char *s1, char *s2)
53 {}		/* so we can load ulockf() */
54 /*---------------------------------------------------------- */
55 extern	int	lockf();
56 
57 /*
58  *	lastname	- If the path name starts with "/dev/",
59  *			  return the rest of the string.
60  *			- Otherwise, return the last token of the path name
61  */
62 char *
lastname(char * name)63 lastname(char *name)
64 {
65 	char	*sp, *p;
66 
67 	sp = name;
68 	if (strncmp(sp, "/dev/", 5) == 0)
69 		sp += 5;
70 	else
71 		while ((p = (char *)strchr(sp,'/')) != (char *)NULL) {
72 			sp = ++p;
73 		}
74 	return (sp);
75 }
76 
77 /*
78  *	tm_lock(fd)	- set advisory lock on the device
79  */
80 int
tm_lock(int fd)81 tm_lock(int fd)
82 {
83 	extern	int	fd_mklock();
84 	return (fd_mklock(fd));
85 }
86 
87 /*
88  *	tm_checklock	- check if advisory lock is on
89  */
90 int
tm_checklock(int fd)91 tm_checklock(int fd)
92 {
93 	extern	int	fd_cklock();
94 	return (fd_cklock(fd));
95 }
96 
97 /*
98  * check_session(fd) - check if a session established on fd
99  *		       return 1 if session exists, otherwise, return 0.
100  *
101  */
102 int
check_session(int fd)103 check_session(int fd)
104 {
105 	pid_t	sid;
106 
107 	if (ioctl(fd, TIOCGSID, &sid) == -1)
108 		return(0);
109 	else if (sid == 0)
110 		return(0);
111 	else
112 		return(1);
113 }
114