1INITGROUPS(3)              Linux Programmer's Manual             INITGROUPS(3)
2
3
4

NAME

6       initgroups - initialize the supplementary group access list
7

SYNOPSIS

9       #include <sys/types.h>
10       #include <grp.h>
11
12       int initgroups(const char *user, gid_t group);
13
14   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
15
16       initgroups():
17           Since glibc 2.19:
18               _DEFAULT_SOURCE
19           Glibc 2.19 and earlier:
20               _BSD_SOURCE
21

DESCRIPTION

23       The  initgroups() function initializes the group access list by reading
24       the group database /etc/group and using all groups of which user  is  a
25       member.  The additional group group is also added to the list.
26
27       The user argument must be non-NULL.
28

RETURN VALUE

30       The  initgroups()  function  returns 0 on success.  On error, -1 is re‐
31       turned, and errno is set to indicate the error.
32

ERRORS

34       ENOMEM Insufficient memory to allocate group information structure.
35
36       EPERM  The calling process has insufficient privilege.  See the  under‐
37              lying system call setgroups(2).
38

FILES

40       /etc/group
41              group database file
42

ATTRIBUTES

44       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
45       tributes(7).
46
47       ┌─────────────────────────────────────┬───────────────┬────────────────┐
48Interface                            Attribute     Value          
49       ├─────────────────────────────────────┼───────────────┼────────────────┤
50initgroups()                         │ Thread safety │ MT-Safe locale │
51       └─────────────────────────────────────┴───────────────┴────────────────┘
52

CONFORMING TO

54       SVr4, 4.3BSD.
55

SEE ALSO

57       getgroups(2), setgroups(2), credentials(7)
58

COLOPHON

60       This page is part of release 5.13 of the Linux  man-pages  project.   A
61       description  of  the project, information about reporting bugs, and the
62       latest    version    of    this    page,    can     be     found     at
63       https://www.kernel.org/doc/man-pages/.
64
65
66
67GNU                               2021-03-22                     INITGROUPS(3)
Impressum