1 '\" te
2 .\" Copyright (c) 2004 Sun Microsystems, Inc. All Rights Reserved.
3 .\" Copyright 1989 AT&T
4 .\" Portions Copyright (c) 1992, X/Open Company Limited. All Rights Reserved.
5 .\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at
6 .\" http://www.opengroup.org/bookstore/.
7 .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html.
8 .\" This notice shall appear on any product containing this material.
9 .\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
10 .\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
11 .\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
12 .TH GETLOGIN 3C "May 18, 2004"
13 .SH NAME
14 getlogin, getlogin_r \- get login name
15 .SH SYNOPSIS
16 .LP
17 .nf
18 #include <unistd.h>
19
20 \fBchar *\fR\fBgetlogin\fR(\fBvoid\fR);
21 .fi
22
23 .LP
24 .nf
25 \fBchar *\fR\fBgetlogin_r\fR(\fBchar *\fR\fIname\fR, \fBint\fR \fInamelen\fR);
26 .fi
27
28 .SS "Standard conforming"
29 .LP
30 .nf
31 cc [ \fIflag \fR... ] \fIfile\fR... \fB-D_POSIX_PTHREAD_SEMANTICS\fR [ \fIlibrary \fR... ]
32
33 \fBint\fR \fBgetlogin_r\fR(\fBchar *\fR\fIname\fR, \fBsize_t\fR \fInamesize\fR);
34 .fi
35
36 .SH DESCRIPTION
37 .sp
38 .LP
39 The \fBgetlogin()\fR function returns a pointer to the login name as found in
40 \fB/var/adm/utmpx\fR. It can be used in conjunction with \fBgetpwnam\fR(3C) to
41 locate the correct password file entry when the same user \fBID\fR is shared by
42 several login names.
43 .sp
44 .LP
45 If \fBgetlogin()\fR is called within a process that is not attached to a
46 terminal, it returns a null pointer. The correct procedure for determining the
47 login name is to call \fBcuserid\fR(3C), or to call \fBgetlogin()\fR and if it
48 fails to call \fBgetpwuid\fR(3C).
49 .sp
50 .LP
51 The \fBgetlogin_r()\fR function has the same functionality as \fBgetlogin()\fR
52 except that the caller must supply a buffer \fIname\fR with length
53 \fInamelen\fR to store the result. The \fIname\fR buffer must be at least
54 \fB_POSIX_LOGIN_NAME_MAX\fR bytes in size (defined in <\fBlimits.h\fR>). The
55 POSIX version (see \fBstandards\fR(5)) of \fBgetlogin_r()\fR takes a
56 \fInamesize\fR parameter of type \fBsize_t\fR.
57 .SH RETURN VALUES
58 .sp
59 .LP
60 Upon successful completion, \fBgetlogin()\fR returns a pointer to the login
61 name or a null pointer if the user's login name cannot be found. Otherwise it
62 returns a null pointer and sets \fBerrno\fR to indicate the error.
63 .sp
64 .LP
65 The standard-conforming \fBgetlogin_r()\fR returns \fB0\fR if successful, or
66 the error number upon failure.
67 .SH ERRORS
68 .sp
69 .LP
70 The \fBgetlogin_r()\fR function will fail if:
71 .sp
72 .ne 2
73 .na
74 \fB\fBERANGE\fR\fR
134 .LP
135 The return value of \fBgetlogin()\fR points to thread-specific data whose
136 content is overwritten on each call by the same thread.
137 .sp
138 .LP
139 Three names associated with the current process can be determined:
140 \fBgetpwuid(\fR\fBgeteuid()\fR\fB)\fR returns the name associated with the
141 effective user ID of the process; \fBgetlogin()\fR returns the name associated
142 with the current login activity; and \fBgetpwuid(\fR\fBgetuid()\fR\fB)\fR
143 returns the name associated with the real user ID of the process.
144 .SH FILES
145 .sp
146 .ne 2
147 .na
148 \fB\fB/var/adm/utmpx\fR\fR
149 .ad
150 .RS 18n
151 user access and administration information
152 .RE
153
154 .SH ATTRIBUTES
155 .sp
156 .LP
157 See \fBattributes\fR(5) for descriptions of the following attributes:
158 .sp
159
160 .sp
161 .TS
162 box;
163 c | c
164 l | l .
165 ATTRIBUTE TYPE ATTRIBUTE VALUE
166 _
167 Interface Stability Standard
168 _
169 MT-Level See below.
170 .TE
171
172 .SH SEE ALSO
173 .sp
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1 '\" te
2 .\" Copyright (c) 2013 Gary Mills
3 .\" Copyright (c) 2004 Sun Microsystems, Inc. All Rights Reserved.
4 .\" Copyright 1989 AT&T
5 .\" Portions Copyright (c) 1992, X/Open Company Limited. All Rights Reserved.
6 .\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at
7 .\" http://www.opengroup.org/bookstore/.
8 .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html.
9 .\" This notice shall appear on any product containing this material.
10 .\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
11 .\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
12 .\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
13 .TH GETLOGIN 3C "May 25, 2013"
14 .SH NAME
15 getlogin, getlogin_r \- get login name
16 .SH SYNOPSIS
17 .LP
18 .nf
19 #include <unistd.h>
20
21 \fBchar *\fR\fBgetlogin\fR(\fBvoid\fR);
22 .fi
23
24 .LP
25 .nf
26 \fBchar *\fR\fBgetlogin_r\fR(\fBchar *\fR\fIname\fR, \fBint\fR \fInamelen\fR);
27 .fi
28
29 .SS "Standard conforming"
30 .LP
31 .nf
32 cc [ \fIflag \fR... ] \fIfile\fR... \fB-D_POSIX_PTHREAD_SEMANTICS\fR [ \fIlibrary \fR... ]
33
34 \fBint\fR \fBgetlogin_r\fR(\fBchar *\fR\fIname\fR, \fBsize_t\fR \fInamesize\fR);
35 .fi
36
37 .SH DESCRIPTION
38 .sp
39 .LP
40 The \fBgetlogin()\fR function returns a pointer to the login name as found in
41 \fB/var/adm/utmpx\fR. It can be used in conjunction with \fBgetpwnam\fR(3C) to
42 locate the correct password file entry when the same user \fBID\fR is shared by
43 several login names.
44 .sp
45 .LP
46 The login name plus the terminating null byte can be up to 33 characters
47 in length.
48 Newly-compiled programs should use the \fBLOGIN_NAME_MAX\fR symbol,
49 defined in <\fBlimits.h\fR>, to size the buffer.
50 Older programs that call \fBgetlogin()\fR expect only the legacy
51 9-character length.
52 These automatically link to a version of the \fBgetlogin()\fR functions that
53 truncates longer login names.
54 It's also possible to compile new programs that link to truncating versions
55 of these functions by defining \fB__USE_LEGACY_LOGNAME__\fR in the
56 compile environment.
57 .sp
58 .LP
59 Some older programs will correctly handle long login names returned
60 by the \fBgetlogin()\fR function.
61 For this case, the user compatibility library
62 \fB/usr/lib/getloginx.so.1\fR redirects to a version of the \fBgetlogin()\fR
63 function that returns the long name.
64 This library should be added to such an application
65 at runtime using \fBLD_PRELOAD\fR.
66 .sp
67 .LP
68 If \fBgetlogin()\fR is called within a process that is not attached to a
69 terminal, it returns a null pointer. The correct procedure for determining the
70 login name is to call \fBcuserid\fR(3C), or to call \fBgetlogin()\fR and if it
71 fails to call \fBgetpwuid\fR(3C).
72 .sp
73 .LP
74 The \fBgetlogin_r()\fR function has the same functionality as \fBgetlogin()\fR
75 except that the caller must supply a buffer \fIname\fR with length
76 \fInamelen\fR to store the result. The \fIname\fR buffer must be at least
77 \fBLOGIN_NAME_MAX\fR bytes in size (defined in <\fBlimits.h\fR>). The
78 POSIX version (see \fBstandards\fR(5)) of \fBgetlogin_r()\fR takes a
79 \fInamesize\fR parameter of type \fBsize_t\fR.
80 .SH RETURN VALUES
81 .sp
82 .LP
83 Upon successful completion, \fBgetlogin()\fR returns a pointer to the login
84 name or a null pointer if the user's login name cannot be found. Otherwise it
85 returns a null pointer and sets \fBerrno\fR to indicate the error.
86 .sp
87 .LP
88 The standard-conforming \fBgetlogin_r()\fR returns \fB0\fR if successful, or
89 the error number upon failure.
90 .SH ERRORS
91 .sp
92 .LP
93 The \fBgetlogin_r()\fR function will fail if:
94 .sp
95 .ne 2
96 .na
97 \fB\fBERANGE\fR\fR
157 .LP
158 The return value of \fBgetlogin()\fR points to thread-specific data whose
159 content is overwritten on each call by the same thread.
160 .sp
161 .LP
162 Three names associated with the current process can be determined:
163 \fBgetpwuid(\fR\fBgeteuid()\fR\fB)\fR returns the name associated with the
164 effective user ID of the process; \fBgetlogin()\fR returns the name associated
165 with the current login activity; and \fBgetpwuid(\fR\fBgetuid()\fR\fB)\fR
166 returns the name associated with the real user ID of the process.
167 .SH FILES
168 .sp
169 .ne 2
170 .na
171 \fB\fB/var/adm/utmpx\fR\fR
172 .ad
173 .RS 18n
174 user access and administration information
175 .RE
176
177 .sp
178 .ne 2
179 .na
180 \fB\fB/usr/lib/getloginx.so.1\fR\fR
181 .ad
182 .RS 18n
183 A compatibility library that returns long login names to older applications.
184 .RE
185
186 .sp
187 .ne 2
188 .na
189 \fB\fB/usr/lib/64/getloginx.so.1\fR\fR
190 .ad
191 .RS 18n
192 A 64-bit compatibility library to return long login names.
193 .RE
194
195 .SH ATTRIBUTES
196 .sp
197 .LP
198 See \fBattributes\fR(5) for descriptions of the following attributes:
199 .sp
200
201 .sp
202 .TS
203 box;
204 c | c
205 l | l .
206 ATTRIBUTE TYPE ATTRIBUTE VALUE
207 _
208 Interface Stability Standard
209 _
210 MT-Level See below.
211 .TE
212
213 .SH SEE ALSO
214 .sp
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