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1 | .\" Copyright (c) 1983, 1991 The Regents of the University of California. |
2 | .\" All rights reserved. | |
3 | .\" | |
4 | .\" Redistribution and use in source and binary forms, with or without | |
5 | .\" modification, are permitted provided that the following conditions | |
6 | .\" are met: | |
7 | .\" 1. Redistributions of source code must retain the above copyright | |
8 | .\" notice, this list of conditions and the following disclaimer. | |
9 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
10 | .\" notice, this list of conditions and the following disclaimer in the | |
11 | .\" documentation and/or other materials provided with the distribution. | |
12 | .\" 3. All advertising materials mentioning features or use of this software | |
13 | .\" must display the following acknowledgement: | |
14 | .\" This product includes software developed by the University of | |
15 | .\" California, Berkeley and its contributors. | |
16 | .\" 4. Neither the name of the University nor the names of its contributors | |
17 | .\" may be used to endorse or promote products derived from this software | |
18 | .\" without specific prior written permission. | |
19 | .\" | |
20 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
21 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
22 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
23 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
24 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
25 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
26 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
27 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
28 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
29 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
30 | .\" SUCH DAMAGE. | |
31 | .\" | |
32 | .\" @(#)setregid.2 6.4 (Berkeley) 3/10/91 | |
33 | .\" | |
34 | .\" Modified Sat Jul 24 09:08:49 1993 by Rik Faith <faith@cs.unc.edu> | |
35 | .\" Portions extracted from linux/kernel/sys.c: | |
36 | .\" Copyright (C) 1991, 1992 Linus Torvalds | |
37 | .\" May be distributed under the GNU General Public License | |
38 | .\" Changes: 1994-07-29 by Wilf <G.Wilford@ee.surrey.ac.uk> | |
39 | .\" 1994-08-02 by Wilf due to change in kernel. | |
40 | .\" 2004-07-04 by aeb | |
41 | .\" 2004-05-27 by Michael Kerrisk | |
42 | .\" | |
cc4615cc | 43 | .TH SETREUID 2 2007-07-26 "Linux" "Linux Programmer's Manual" |
fea681da MK |
44 | .SH NAME |
45 | setreuid, setregid \- set real and/or effective user or group ID | |
46 | .SH SYNOPSIS | |
47 | .B #include <sys/types.h> | |
48 | .br | |
49 | .B #include <unistd.h> | |
50 | .sp | |
51 | .BI "int setreuid(uid_t " ruid ", uid_t " euid ); | |
52 | .br | |
53 | .BI "int setregid(gid_t " rgid ", gid_t " egid ); | |
cc4615cc MK |
54 | .sp |
55 | .in -4n | |
56 | Feature Test Macro Requirements for glibc (see | |
57 | .BR feature_test_macros (7)): | |
58 | .in | |
59 | .sp | |
60 | .BR setreuid (), | |
61 | .BR setregid (): | |
62 | _BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500 | |
fea681da | 63 | .SH DESCRIPTION |
e511ffb6 | 64 | .BR setreuid () |
a1ffe9f5 | 65 | sets real and effective user IDs of the calling process. |
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66 | |
67 | Supplying a value of \-1 for either the real or effective user ID forces | |
68 | the system to leave that ID unchanged. | |
69 | ||
70 | Unprivileged processes may only set the effective user ID to the real user ID, | |
d9df8ff8 | 71 | the effective user ID or the saved set-user-ID. |
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72 | |
73 | POSIX: It is unspecified whether unprivileged processes may set the | |
d9df8ff8 MK |
74 | real user ID to the real user ID, the effective user ID or the |
75 | saved set-user-ID. | |
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76 | |
77 | Linux: Unprivileged users may only set the real user ID to | |
78 | the real user ID or the effective user ID. | |
79 | ||
c13182ef | 80 | Linux: If the real user ID is set or the effective user ID is set to a value |
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81 | not equal to the previous real user ID, |
82 | the saved set-user-ID will be set to the new effective user ID. | |
fea681da MK |
83 | |
84 | Completely analogously, | |
e511ffb6 | 85 | .BR setregid () |
a1ffe9f5 | 86 | sets real and effective group ID's of the calling process, |
fea681da | 87 | and all of the above holds with "group" instead of "user". |
fea681da | 88 | .SH "RETURN VALUE" |
c13182ef MK |
89 | On success, zero is returned. |
90 | On error, \-1 is returned, and | |
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91 | .I errno |
92 | is set appropriately. | |
93 | .SH ERRORS | |
94 | .TP | |
95 | .B EPERM | |
a1ffe9f5 | 96 | The calling process is not privileged |
fea681da MK |
97 | (Linux: does not have the |
98 | .B CAP_SETUID | |
99 | capability in the case of | |
c13182ef MK |
100 | .BR setreuid (), |
101 | or the | |
fea681da MK |
102 | .B CAP_SETGID |
103 | capability in the case of | |
104 | .BR setregid ()) | |
105 | and a change other than (i) | |
106 | swapping the effective user (group) ID with the real user (group) ID, | |
107 | or (ii) setting one to the value of the other or (iii) setting the | |
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108 | effective user (group) ID to the value of the |
109 | saved set-user-ID (saved set-group-ID) was specified. | |
fea681da | 110 | .SH "CONFORMING TO" |
97c1eac8 | 111 | POSIX.1-2001, 4.3BSD (the |
e511ffb6 | 112 | .BR setreuid () |
fea681da | 113 | and |
e511ffb6 | 114 | .BR setregid () |
fea681da | 115 | function calls first appeared in 4.2BSD). |
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116 | .SH NOTES |
117 | Setting the effective user (group) ID to the | |
118 | saved set-user-ID (saved set-group-ID) is | |
119 | possible since Linux 1.1.37 (1.1.38). | |
fea681da MK |
120 | .SH "SEE ALSO" |
121 | .BR getgid (2), | |
122 | .BR getuid (2), | |
123 | .BR seteuid (2), | |
124 | .BR setgid (2), | |
125 | .BR setresuid (2), | |
126 | .BR setuid (2), | |
127 | .BR capabilities (7) |