]>
Commit | Line | Data |
---|---|---|
fea681da MK |
1 | .\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu) |
2 | .\" | |
93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
fea681da MK |
4 | .\" Permission is granted to make and distribute verbatim copies of this |
5 | .\" manual provided the copyright notice and this permission notice are | |
6 | .\" preserved on all copies. | |
7 | .\" | |
8 | .\" Permission is granted to copy and distribute modified versions of this | |
9 | .\" manual under the conditions for verbatim copying, provided that the | |
10 | .\" entire resulting derived work is distributed under the terms of a | |
11 | .\" permission notice identical to this one. | |
c13182ef | 12 | .\" |
fea681da MK |
13 | .\" Since the Linux kernel and libraries are constantly changing, this |
14 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
15 | .\" responsibility for errors or omissions, or for damages resulting from | |
16 | .\" the use of the information contained herein. The author(s) may not | |
17 | .\" have taken the same level of care in the production of this manual, | |
18 | .\" which is licensed free of charge, as they might when working | |
19 | .\" professionally. | |
c13182ef | 20 | .\" |
fea681da MK |
21 | .\" Formatted or processed versions of this manual, if unaccompanied by |
22 | .\" the source, must acknowledge the copyright and authors of this work. | |
4b72fb64 | 23 | .\" %%%LICENSE_END |
fea681da MK |
24 | .\" |
25 | .\" Modified Thu Oct 31 12:04:29 1996 by Eric S. Raymond <esr@thyrsus.com> | |
c11b1abf | 26 | .\" Modified, 27 May 2004, Michael Kerrisk <mtk.manpages@gmail.com> |
fea681da | 27 | .\" Added notes on capability requirements |
f95ef6d5 MK |
28 | .\" 2008-05-03, mtk, expanded and rewrote parts of DESCRIPTION and RETURN |
29 | .\" VALUE, made style of page more consistent with man-pages style. | |
fea681da | 30 | .\" |
de1fb253 | 31 | .TH GETGROUPS 2 2010-11-22 "Linux" "Linux Programmer's Manual" |
fea681da MK |
32 | .SH NAME |
33 | getgroups, setgroups \- get/set list of supplementary group IDs | |
34 | .SH SYNOPSIS | |
35 | .B #include <sys/types.h> | |
36 | .br | |
37 | .B #include <unistd.h> | |
38 | .sp | |
39 | .BI "int getgroups(int " size ", gid_t " list []); | |
40 | .sp | |
41 | .B #include <grp.h> | |
42 | .sp | |
43 | .BI "int setgroups(size_t " size ", const gid_t *" list ); | |
cc4615cc MK |
44 | .sp |
45 | .in -4n | |
46 | Feature Test Macro Requirements for glibc (see | |
47 | .BR feature_test_macros (7)): | |
48 | .in | |
49 | .sp | |
50 | .BR setgroups (): | |
51 | _BSD_SOURCE | |
fea681da | 52 | .SH DESCRIPTION |
f95ef6d5 | 53 | .PP |
e511ffb6 | 54 | .BR getgroups () |
f95ef6d5 MK |
55 | returns the supplementary group IDs of the calling process in |
56 | .IR list . | |
57 | The argument | |
fea681da | 58 | .I size |
f95ef6d5 MK |
59 | should be set to the maximum number of items that can be stored in the |
60 | buffer pointed to by | |
fea681da | 61 | .IR list . |
f95ef6d5 MK |
62 | If the calling process is a member of more than |
63 | .I size | |
64 | supplementary groups, then an error results. | |
fea681da | 65 | It is unspecified whether the effective group ID of the calling process |
c13182ef MK |
66 | is included in the returned list. |
67 | (Thus, an application should also call | |
fea681da MK |
68 | .BR getegid (2) |
69 | and add or remove the resulting value.) | |
f95ef6d5 | 70 | |
fea681da MK |
71 | If |
72 | .I size | |
73 | is zero, | |
74 | .I list | |
75 | is not modified, but the total number of supplementary group IDs for the | |
76 | process is returned. | |
f95ef6d5 MK |
77 | This allows the caller to determine the size of a dynamically allocated |
78 | .I list | |
79 | to be used in a further call to | |
80 | .BR getgroups (). | |
81 | .PP | |
e511ffb6 | 82 | .BR setgroups () |
f95ef6d5 | 83 | sets the supplementary group IDs for the calling process. |
fea681da MK |
84 | Appropriate privileges (Linux: the |
85 | .B CAP_SETGID | |
86 | capability) are required. | |
f95ef6d5 MK |
87 | The |
88 | .I size | |
89 | argument specifies the number of supplementary group IDs | |
90 | in the buffer pointed to by | |
91 | .IR list . | |
47297adb | 92 | .SH RETURN VALUE |
f95ef6d5 | 93 | On success, |
e511ffb6 | 94 | .BR getgroups () |