NAME

       initgroups - initialize the supplementary group access list

SYNOPSIS

       #include <sys/types.h>
       #include <grp.h>

       int initgroups(const char *user, gid_t group);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       initgroups():
           Since glibc 2.19:
               _DEFAULT_SOURCE
           Glibc 2.19 and earlier:
               _BSD_SOURCE

DESCRIPTION

       The  initgroups() function initializes the group access list by reading the group database /etc/group and
       using all groups of which user is a member.  The additional group group is also added to the list.

       The user argument must be non-NULL.

RETURN VALUE

       The initgroups()  function  returns  0  on  success.   On  error,  -1  is  returned,  and  errno  is  set
       appropriately.

ERRORS

       ENOMEM Insufficient memory to allocate group information structure.

       EPERM  The calling process has insufficient privilege.  See the underlying system call setgroups(2).

FILES

       /etc/group
              group database file

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).
       ┌──────────────┬───────────────┬────────────────┐
       │ Interface    │ Attribute     │ Value          │
       ├──────────────┼───────────────┼────────────────┤
       │ initgroups() │ Thread safety │ MT-Safe locale │
       └──────────────┴───────────────┴────────────────┘

CONFORMING TO

       SVr4, 4.3BSD.

SEE ALSO

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

COLOPHON

       This  page  is  part  of  release  5.05  of  the  Linux man-pages project.  A description of the project,
       information  about  reporting  bugs,  and  the  latest  version  of  this   page,   can   be   found   at
       https://www.kernel.org/doc/man-pages/.

GNU                                                2017-09-15                                      INITGROUPS(3)