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114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: getlogin.c,v 1.1 1997/09/21 06:02:56 gdr Exp $
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*
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* This file is formatted for tab stops every 8 columns.
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*/
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#ifdef __ORCAC__
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segment "libc_gen__";
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#endif
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)getlogin.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <pwd.h>
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#include <utmp.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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int _logname_valid; /* known to setlogin() */
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static char logname[MAXLOGNAME + 1];
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/*
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* We don't have the _getlogin(2) and setlogin(2) kernel traps for
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* GNO; fake them out.
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*/
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#ifdef __GNO__
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static int
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_getlogin (char *buffer, int length)
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{
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struct passwd *pw;
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int len;
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if ((pw = getpwuid(getuid())) == NULL) {
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return -1;
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}
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len = strlen(pw->pw_name);
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if (len > length) {
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return -1;
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}
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strcpy(buffer, pw->pw_name);
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len = strlen(logname);
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return 0;
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}
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int
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setlogin (const char *name)
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{
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if (name == NULL) {
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errno = EFAULT;
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return -1;
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}
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if (getuid() != 0) {
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errno = EPERM;
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return -1;
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}
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if (strlen(name) > MAXLOGNAME) {
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errno = EINVAL;
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return -1;
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}
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strcpy(logname, name);
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_logname_valid = 1;
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return 0;
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}
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#endif
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char *
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getlogin(void)
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{
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if (_logname_valid == 0) {
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if (_getlogin(logname, sizeof(logname) - 1) < 0)
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return ((char *)NULL);
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_logname_valid = 1;
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}
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return (*logname ? logname : (char *)NULL);
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}
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