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 weak _cuserid = cuserid
31
32 #include "lint.h"
33 #include <stdio.h>
34 #include <pwd.h>
35 #include <string.h>
36 #include <stdlib.h>
37 #include <unistd.h>
38 #include <pthread.h>
39
40 static char res[L_cuserid];
41
42 char *
cuserid(char * s)43 cuserid(char *s)
44 {
45 struct passwd *pw;
46 struct passwd pwd;
47 char buffer[BUFSIZ];
48 char utname[L_cuserid];
49 char *p;
50 int cancel_state;
51
52 /*
53 * The UNIX98 Posix conformance test suite requires
54 * cuserid() to not be a cancellation point.
55 */
56 (void) pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cancel_state);
57
58 if (s == NULL)
59 s = res;
60 if ((p = getlogin_r(utname, L_cuserid)) != NULL) {
61 (void) strlcpy(s, p, L_cuserid);
62 } else if ((pw = getpwuid_r(getuid(), &pwd, buffer, BUFSIZ)) != NULL) {
63 (void) strlcpy(s, pw->pw_name, L_cuserid);
64 } else {
65 *s = '\0';
66 s = NULL;
67 }
68
69 (void) pthread_setcancelstate(cancel_state, NULL);
70 return (s);
71 }
72