initgroups(3C)

NAME

     initgroups - initialize the supplementary group access list

SYNOPSIS

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

     int initgroups(const char *name, gid_t basegid);

DESCRIPTION

     The initgroups() function reads the group  database  to  get
     the  group  membership  for  the user specified by name, and
     initializes the supplementary group access list of the  cal-
     ling  process (see getgrnam(3C) and getgroups(2)). The base-
     gid group ID is also included  in  the  supplementary  group
     access  list.  This  is typically the real group ID from the
     user database.

     While scanning the group database, if the number of  groups,
     including the basegid entry, exceeds NGROUPS_MAX, subsequent
     group entries are ignored.

RETURN VALUES

     Upon successful completion, 0 is returned. Otherwise, -1  is
     returned and errno is set to indicate the error.

ERRORS

     The initgroups() function will fail and not change the  sup-
     plementary group access list if:

      EPERM
           The effective user ID is not super-user.

ATTRIBUTES

     See attributes(5) for descriptions of the  following  attri-
     butes:

     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | MT-Level                    | MT-Safe                     |
    |_____________________________|_____________________________|

SEE ALSO

     getgroups(2), getgrnam(3C), attributes(5)