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 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 #pragma weak getlogin = _getlogin 34 #pragma weak getlogin_r = _getlogin_r 35 36 #include "synonyms.h" 37 #include <sys/types.h> 38 #include <sys/stat.h> 39 #include <fcntl.h> 40 #include <string.h> 41 #include <stdlib.h> 42 #include <limits.h> 43 #include "utmpx.h" 44 #include <unistd.h> 45 #include <errno.h> 46 #include <thread.h> 47 #include <synch.h> 48 #include <mtlib.h> 49 #include "tsd.h" 50 51 /* 52 * XXX - _POSIX_LOGIN_NAME_MAX limits the length of a login name. The utmpx 53 * interface provides for a 32 character login name, but for the sake of 54 * compatibility, we are still using the old utmp-imposed limit. 55 */ 56 57 /* 58 * POSIX.1c Draft-6 version of the function getlogin_r. 59 * It was implemented by Solaris 2.3. 60 */ 61 char * 62 _getlogin_r(char *answer, int namelen) 63 { 64 int uf; 65 off64_t me; 66 struct futmpx ubuf; 67 68 if (namelen < _POSIX_LOGIN_NAME_MAX) { 69 errno = ERANGE; 70 return (NULL); 71 } 72 73 if ((me = (off64_t)ttyslot()) < 0) 74 return (NULL); 75 if ((uf = open64(UTMPX_FILE, 0)) < 0) 76 return (NULL); 77 (void) lseek64(uf, me * sizeof (ubuf), SEEK_SET); 78 if (read(uf, &ubuf, sizeof (ubuf)) != sizeof (ubuf)) { 79 (void) close(uf); 80 return (NULL); 81 } 82 (void) close(uf); 83 if (ubuf.ut_user[0] == '\0') 84 return (NULL); 85 (void) strncpy(&answer[0], &ubuf.ut_user[0], 86 _POSIX_LOGIN_NAME_MAX - 1); 87 answer[_POSIX_LOGIN_NAME_MAX - 1] = '\0'; 88 return (&answer[0]); 89 } 90 91 /* 92 * POSIX.1c standard version of the function getlogin_r. 93 * User gets it via static getlogin_r from the header file. 94 */ 95 int 96 __posix_getlogin_r(char *name, int namelen) 97 { 98 int nerrno = 0; 99 int oerrno = errno; 100 101 errno = 0; 102 if (_getlogin_r(name, namelen) == NULL) { 103 if (errno == 0) 104 nerrno = EINVAL; 105 else 106 nerrno = errno; 107 } 108 errno = oerrno; 109 return (nerrno); 110 } 111 112 char * 113 getlogin(void) 114 { 115 char *answer = tsdalloc(_T_LOGIN, _POSIX_LOGIN_NAME_MAX, NULL); 116 117 if (answer == NULL) 118 return (NULL); 119 return (_getlogin_r(answer, _POSIX_LOGIN_NAME_MAX)); 120 } 121