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 5.10 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/.