1INITGROUPS(3)              Linux Programmer's Manual             INITGROUPS(3)
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NAME

6       initgroups - initialize the supplementary group access list
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SYNOPSIS

9       #include <sys/types.h>
10       #include <grp.h>
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12       int initgroups(const char *user, gid_t group);
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14   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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16       initgroups():
17           Since glibc 2.19:
18               _DEFAULT_SOURCE
19           Glibc 2.19 and earlier:
20               _BSD_SOURCE
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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.
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27       The user argument must be non-NULL.
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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.
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ERRORS

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

40       /etc/group
41              group database file
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ATTRIBUTES

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

54       SVr4, 4.3BSD.
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SEE ALSO

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

60       This page is part of release 5.12 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/.
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67GNU                               2021-03-22                     INITGROUPS(3)
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