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 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #pragma weak _getlogin = getlogin 33 #pragma weak _getlogin_r = getlogin_r 34 35 #include "lint.h" 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 #include <fcntl.h> 39 #include <string.h> 40 #include <stdlib.h> 41 #include <limits.h> 42 #include "utmpx.h" 43 #include <unistd.h> 44 #include <errno.h> 45 #include <thread.h> 46 #include <synch.h> 47 #include <mtlib.h> 48 #include "tsd.h" 49 50 /* 51 * XXX - _POSIX_LOGIN_NAME_MAX limits the length of a login name. The utmpx 52 * interface provides for a 32 character login name, but for the sake of 53 * compatibility, we are still using the old utmp-imposed limit. 54 */ 55 56 /* 57 * POSIX.1c Draft-6 version of the function getlogin_r. 58 * It was implemented by Solaris 2.3. 59 */ 60 char * 61 getlogin_r(char *answer, int namelen) 62 { 63 int uf; 64 off64_t me; 65 struct futmpx ubuf; 66 67 if (namelen < _POSIX_LOGIN_NAME_MAX) { 68 errno = ERANGE; 69 return (NULL); 70 } 71 72 if ((me = (off64_t)ttyslot()) < 0) 73 return (NULL); 74 if ((uf = open64(UTMPX_FILE, 0)) < 0) 75 return (NULL); 76 (void) lseek64(uf, me * sizeof (ubuf), SEEK_SET); 77 if (read(uf, &ubuf, sizeof (ubuf)) != sizeof (ubuf)) { 78 (void) close(uf); 79 return (NULL); 80 } 81 (void) close(uf); 82 if (ubuf.ut_user[0] == '\0') 83 return (NULL); 84 (void) strncpy(&answer[0], &ubuf.ut_user[0], 85 _POSIX_LOGIN_NAME_MAX - 1); 86 answer[_POSIX_LOGIN_NAME_MAX - 1] = '\0'; 87 return (&answer[0]); 88 } 89 90 /* 91 * POSIX.1c standard version of the function getlogin_r. 92 * User gets it via static getlogin_r from the header file. 93 */ 94 int 95 __posix_getlogin_r(char *name, int namelen) 96 { 97 int nerrno = 0; 98 int oerrno = errno; 99 100 errno = 0; 101 if (getlogin_r(name, namelen) == NULL) { 102 if (errno == 0) 103 nerrno = EINVAL; 104 else 105 nerrno = errno; 106 } 107 errno = oerrno; 108 return (nerrno); 109 } 110 111 char * 112 getlogin(void) 113 { 114 char *answer = tsdalloc(_T_LOGIN, _POSIX_LOGIN_NAME_MAX, NULL); 115 116 if (answer == NULL) 117 return (NULL); 118 return (getlogin_r(answer, _POSIX_LOGIN_NAME_MAX)); 119 } 120