initgroups(3) [redhat man page]

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

NAME

       initgroups - initialize the supplementary group access list

SYNOPSIS

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

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

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.

RETURN VALUE

       The initgroups() function returns 0 on success, or -1 if an error occurs.

ERRORS

       EPERM  The calling process does not have sufficient privileges.

       ENOMEM Insufficient memory to allocate group information structure.

FILES

       /etc/group	   group database file

CONFORMING TO

       SVID 3, BSD 4.3

NOTES

       The prototype for initgroups is only available if _BSD_SOURCE is defined (either explicitly, or implicitly, by not  defining  _POSIX_SOURCE
       or compiling with the -ansi flag).

SEE ALSO

       getgroups(2), setgroups(2)

GNU
								    1993-04-05							     INITGROUPS(3)

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

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 4.15 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)