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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * Copyright (c) 1984 Regents of the University of California. 29 * All rights reserved. The Berkeley software License Agreement 30 * specifies the terms and conditions for redistribution. 31 */ 32 33 /* 34 * Return the number of the slot in the utmp file 35 * corresponding to the current user: try for file 0, 1, 2. 36 * To mimic the behavior of getttyent, we loop through utmp 37 * and try to find an entry with a matching line number. 38 * If we don't find one we return the index of the end of 39 * the file, so that the record can be added to the end of 40 * the file. 41 */ 42 #include "../../sys/common/compat.h" 43 #include <sys/syscall.h> 44 #include <sys/fcntl.h> 45 #include <stdio.h> 46 #include <unistd.h> 47 #include <strings.h> 48 49 int 50 ttyslot(void) 51 { 52 char *tp, *p; 53 int s; 54 int fd; 55 struct utmpx utx; 56 57 58 if ((tp = ttyname(0)) == NULL && 59 (tp = ttyname(1)) == NULL && 60 (tp = ttyname(2)) == NULL) 61 return (0); 62 if ((p = rindex(tp, '/')) == NULL) 63 p = tp; 64 else 65 p++; 66 67 if ((fd = _syscall(SYS_openat, 68 AT_FDCWD, "/etc/utmpx", O_RDONLY)) == -1) { 69 perror("ttyslot: open of /etc/utmpx failed:"); 70 return (0); 71 } 72 73 s = 0; 74 while (_read(fd, &utx, sizeof (struct utmpx)) > 0) { 75 s++; 76 if (strncmp(utx.ut_line, p, sizeof (utx.ut_line)) == 0) { 77 _syscall(SYS_close, fd); 78 return (s); 79 } 80 } 81 _syscall(SYS_close, fd); 82 return (s); 83 } 84