usr/src/cmd/ttymon/tmlock.c

   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
  44 assert(char *s1, char *s2, int i1, char *s3, int i2)
  45 {}
  46
  47 void
  48 cleanup(){}
  49
  50 /*ARGSUSED*/
  51 void
  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 *
  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
  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
  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
 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 }