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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 | .\" | |
43 | .TH SETREUID 2 2004-07-04 "Linux 2.6" "Linux Programmer's Manual" | |
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 ); | |
54 | .SH DESCRIPTION | |
e511ffb6 | 55 | .BR setreuid () |
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56 | sets real and effective user IDs of the current process. |
57 | ||
58 | Supplying a value of \-1 for either the real or effective user ID forces | |
59 | the system to leave that ID unchanged. | |
60 | ||
61 | Unprivileged processes may only set the effective user ID to the real user ID, | |
d9df8ff8 | 62 | the effective user ID or the saved set-user-ID. |
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63 | |
64 | POSIX: It is unspecified whether unprivileged processes may set the | |
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65 | real user ID to the real user ID, the effective user ID or the |
66 | saved set-user-ID. | |
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67 | |
68 | Linux: Unprivileged users may only set the real user ID to | |
69 | the real user ID or the effective user ID. | |
70 | ||
71 | Linux: If the real user ID is set or the effective user ID is set to a value | |
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72 | not equal to the previous real user ID, |
73 | the saved set-user-ID will be set to the new effective user ID. | |
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74 | |
75 | Completely analogously, | |
e511ffb6 | 76 | .BR setregid () |
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77 | sets real and effective group ID's of the current process, |
78 | and all of the above holds with "group" instead of "user". | |
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79 | .SH "RETURN VALUE" |
80 | On success, zero is returned. On error, \-1 is returned, and | |
81 | .I errno | |
82 | is set appropriately. | |
83 | .SH ERRORS | |
84 | .TP | |
85 | .B EPERM | |
86 | The current process is not privileged | |
87 | (Linux: does not have the | |
88 | .B CAP_SETUID | |
89 | capability in the case of | |
90 | .BR setreuid (), | |
91 | or the | |
92 | .B CAP_SETGID | |
93 | capability in the case of | |
94 | .BR setregid ()) | |
95 | and a change other than (i) | |
96 | swapping the effective user (group) ID with the real user (group) ID, | |
97 | or (ii) setting one to the value of the other or (iii) setting the | |
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98 | effective user (group) ID to the value of the |
99 | saved set-user-ID (saved set-group-ID) was specified. | |
fea681da | 100 | .SH NOTES |
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101 | Setting the effective user (group) ID to the |
102 | saved set-user-ID (saved set-group-ID) is | |
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103 | possible since Linux 1.1.37 (1.1.38). |
104 | .SH "CONFORMING TO" | |
97c1eac8 | 105 | POSIX.1-2001, 4.3BSD (the |
e511ffb6 | 106 | .BR setreuid () |
fea681da | 107 | and |
e511ffb6 | 108 | .BR setregid () |
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109 | function calls first appeared in 4.2BSD). |
110 | .SH "SEE ALSO" | |
111 | .BR getgid (2), | |
112 | .BR getuid (2), | |
113 | .BR seteuid (2), | |
114 | .BR setgid (2), | |
115 | .BR setresuid (2), | |
116 | .BR setuid (2), | |
117 | .BR capabilities (7) |