158f0484fSRodney W. Grimes /* 258f0484fSRodney W. Grimes * Copyright (c) 1988, 1993 358f0484fSRodney W. Grimes * The Regents of the University of California. All rights reserved. 458f0484fSRodney W. Grimes * 558f0484fSRodney W. Grimes * Redistribution and use in source and binary forms, with or without 658f0484fSRodney W. Grimes * modification, are permitted provided that the following conditions 758f0484fSRodney W. Grimes * are met: 858f0484fSRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 958f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer. 1058f0484fSRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 1158f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 1258f0484fSRodney W. Grimes * documentation and/or other materials provided with the distribution. 13fbbd9655SWarner Losh * 3. Neither the name of the University nor the names of its contributors 1458f0484fSRodney W. Grimes * may be used to endorse or promote products derived from this software 1558f0484fSRodney W. Grimes * without specific prior written permission. 1658f0484fSRodney W. Grimes * 1758f0484fSRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1858f0484fSRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1958f0484fSRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2058f0484fSRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2158f0484fSRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2258f0484fSRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2358f0484fSRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2458f0484fSRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2558f0484fSRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2658f0484fSRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2758f0484fSRodney W. Grimes * SUCH DAMAGE. 2858f0484fSRodney W. Grimes */ 2958f0484fSRodney W. Grimes 3058f0484fSRodney W. Grimes #if defined(LIBC_SCCS) && !defined(lint) 3158f0484fSRodney W. Grimes static char sccsid[] = "@(#)getlogin.c 8.1 (Berkeley) 6/4/93"; 3258f0484fSRodney W. Grimes #endif /* LIBC_SCCS and not lint */ 33ea8d448aSDavid E. O'Brien #include <sys/cdefs.h> 34ea8d448aSDavid E. O'Brien __FBSDID("$FreeBSD$"); 3558f0484fSRodney W. Grimes 3658f0484fSRodney W. Grimes #include <sys/param.h> 37fc1d3c6dSDaniel Eischen #include <errno.h> 3858f0484fSRodney W. Grimes #include <pwd.h> 3958f0484fSRodney W. Grimes #include <stdio.h> 4058f0484fSRodney W. Grimes #include <string.h> 4158f0484fSRodney W. Grimes #include <unistd.h> 42d201fe46SDaniel Eischen #include "namespace.h" 43d201fe46SDaniel Eischen #include <pthread.h> 44d201fe46SDaniel Eischen #include "un-namespace.h" 4558f0484fSRodney W. Grimes 464cd01193SMark Murray #include "libc_private.h" 47fc1d3c6dSDaniel Eischen 48d201fe46SDaniel Eischen #define THREAD_LOCK() if (__isthreaded) _pthread_mutex_lock(&logname_mutex) 49d201fe46SDaniel Eischen #define THREAD_UNLOCK() if (__isthreaded) _pthread_mutex_unlock(&logname_mutex) 50d201fe46SDaniel Eischen 51d201fe46SDaniel Eischen extern int _getlogin(char *, int); 52fc1d3c6dSDaniel Eischen 530f3a4d80SJilles Tjoelker int _logname_valid __hidden; /* known to setlogin() */ 54d201fe46SDaniel Eischen static pthread_mutex_t logname_mutex = PTHREAD_MUTEX_INITIALIZER; 5558f0484fSRodney W. Grimes 56fc1d3c6dSDaniel Eischen static char * 57fc1d3c6dSDaniel Eischen getlogin_basic(int *status) 5858f0484fSRodney W. Grimes { 5909f37791SAndrey A. Chernov static char logname[MAXLOGNAME]; 6058f0484fSRodney W. Grimes 6158f0484fSRodney W. Grimes if (_logname_valid == 0) { 62fc1d3c6dSDaniel Eischen if (_getlogin(logname, sizeof(logname)) < 0) { 63fc1d3c6dSDaniel Eischen *status = errno; 64fc1d3c6dSDaniel Eischen return (NULL); 65fc1d3c6dSDaniel Eischen } 6658f0484fSRodney W. Grimes _logname_valid = 1; 6758f0484fSRodney W. Grimes } 68fc1d3c6dSDaniel Eischen *status = 0; 69fc1d3c6dSDaniel Eischen return (*logname ? logname : NULL); 7058f0484fSRodney W. Grimes } 718166f7fdSWes Peters 728166f7fdSWes Peters char * 73fc1d3c6dSDaniel Eischen getlogin(void) 74fc1d3c6dSDaniel Eischen { 75fc1d3c6dSDaniel Eischen char *result; 76fc1d3c6dSDaniel Eischen int status; 77fc1d3c6dSDaniel Eischen 78fc1d3c6dSDaniel Eischen THREAD_LOCK(); 79fc1d3c6dSDaniel Eischen result = getlogin_basic(&status); 80fc1d3c6dSDaniel Eischen THREAD_UNLOCK(); 81fc1d3c6dSDaniel Eischen return (result); 82fc1d3c6dSDaniel Eischen } 83fc1d3c6dSDaniel Eischen 84fc1d3c6dSDaniel Eischen int 858166f7fdSWes Peters getlogin_r(char *logname, int namelen) 868166f7fdSWes Peters { 87fc1d3c6dSDaniel Eischen char *result; 88fc1d3c6dSDaniel Eischen int len; 89fc1d3c6dSDaniel Eischen int status; 90fc1d3c6dSDaniel Eischen 91eef9f6d2SMarcel Moolenaar if (namelen < 1) 92eef9f6d2SMarcel Moolenaar return (ERANGE); 93eef9f6d2SMarcel Moolenaar logname[0] = '\0'; 94eef9f6d2SMarcel Moolenaar 95fc1d3c6dSDaniel Eischen THREAD_LOCK(); 96fc1d3c6dSDaniel Eischen result = getlogin_basic(&status); 97eef9f6d2SMarcel Moolenaar if (status == 0 && result != NULL) { 98eef9f6d2SMarcel Moolenaar len = strlen(result) + 1; 99eef9f6d2SMarcel Moolenaar if (len > namelen) 100fc1d3c6dSDaniel Eischen status = ERANGE; 101fc1d3c6dSDaniel Eischen else 102fc1d3c6dSDaniel Eischen strncpy(logname, result, len); 1038166f7fdSWes Peters } 104fc1d3c6dSDaniel Eischen THREAD_UNLOCK(); 105fc1d3c6dSDaniel Eischen return (status); 1068166f7fdSWes Peters } 107