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      1 /*	$NetBSD: getlogin.c,v 1.17 2024/01/20 14:52:47 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 /*
     30  * Copyright (c) 1988, 1993
     31  *	The Regents of the University of California.  All rights reserved.
     32  *
     33  * Redistribution and use in source and binary forms, with or without
     34  * modification, are permitted provided that the following conditions
     35  * are met:
     36  * 1. Redistributions of source code must retain the above copyright
     37  *    notice, this list of conditions and the following disclaimer.
     38  * 2. Redistributions in binary form must reproduce the above copyright
     39  *    notice, this list of conditions and the following disclaimer in the
     40  *    documentation and/or other materials provided with the distribution.
     41  * 3. Neither the name of the University nor the names of its contributors
     42  *    may be used to endorse or promote products derived from this software
     43  *    without specific prior written permission.
     44  *
     45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     55  * SUCH DAMAGE.
     56  */
     57 
     58 #include <sys/cdefs.h>
     59 #if defined(LIBC_SCCS) && !defined(lint)
     60 #if 0
     61 static char sccsid[] = "@(#)getlogin.c	8.1 (Berkeley) 6/4/93";
     62 #else
     63 __RCSID("$NetBSD: getlogin.c,v 1.17 2024/01/20 14:52:47 christos Exp $");
     64 #endif
     65 #endif /* LIBC_SCCS and not lint */
     66 
     67 #include "namespace.h"
     68 #include <sys/param.h>
     69 #include <pwd.h>
     70 #include <utmp.h>
     71 #include <stdio.h>
     72 #include <string.h>
     73 #include <unistd.h>
     74 #include <errno.h>
     75 #include "reentrant.h"
     76 #include "extern.h"
     77 
     78 #ifdef __weak_alias
     79 __weak_alias(getlogin,_getlogin)
     80 __weak_alias(getlogin_r,_getlogin_r)
     81 __weak_alias(setlogin,_setlogin)
     82 #endif
     83 
     84 static int	__logname_valid;		/* known to setlogin() */
     85 static char logname[MAXLOGNAME + 1];
     86 
     87 #ifdef _REENTRANT
     88 static mutex_t	logname_mutex = MUTEX_INITIALIZER;
     89 #endif
     90 
     91 char *
     92 getlogin(void)
     93 {
     94 	char *rv;
     95 
     96 	mutex_lock(&logname_mutex);
     97 	if (__logname_valid == 0) {
     98 		if (__getlogin(logname, sizeof(logname) - 1) < 0) {
     99 			mutex_unlock(&logname_mutex);
    100 			return ((char *)NULL);
    101 		}
    102 		__logname_valid = 1;
    103 	}
    104 	rv = (*logname ? logname : (char *)NULL);
    105 	mutex_unlock(&logname_mutex);
    106 
    107 	return rv;
    108 }
    109 
    110 int
    111 getlogin_r(char *name, size_t namelen)
    112 {
    113 	size_t len;
    114 	int rv;
    115 
    116 	mutex_lock(&logname_mutex);
    117 	if (__logname_valid == 0) {
    118 		if (__getlogin(logname, sizeof(logname) - 1) < 0) {
    119 			rv = errno;
    120 			mutex_unlock(&logname_mutex);
    121 			return (rv);
    122 		}
    123 		__logname_valid = 1;
    124 	}
    125 	len = strlen(logname) + 1;
    126 	if (len > namelen) {
    127 		rv = ERANGE;
    128 	} else {
    129 		strcpy(name, logname);
    130 		rv = 0;
    131 	}
    132 	mutex_unlock(&logname_mutex);
    133 
    134 	return (rv);
    135 }
    136 
    137 int
    138 setlogin(const char *name)
    139 {
    140 	int retval;
    141 
    142 	retval = __setlogin(name);
    143 	__logname_valid = 0;
    144 
    145 	return (retval);
    146 }
    147