osf1 man page for initgroups

initgroups(3)						     Library Functions Manual						     initgroups(3)

NAME
       initgroups - Initializes concurrent group set

LIBRARY
       Standard C Library (libc.a)

SYNOPSIS
       int initgroups (      char *user,      gid_t base_gid );

PARAMETERS
       Specifies the user whose groups are to be used to initialize the group set.  Specifies an additional group to include in the group set.

DESCRIPTION
       The initgroups() function reads the defined group membership of the specified user and sets the concurrent group set of the current process
       to that value. The base_gid parameter is always included in the concurrent group set, and is normally the principal user's  group.  If  the
       user is in more than NGROUPS_MAX groups, only NGROUPS_MAX groups are set, including the base_gid group.

CAUTION
       The  initgroups() function uses the sia_get_groups() function to set up the group array.  If the program that invokes initgroups() uses any
       of these functions, then calling initgroups() overwrites the static group structure.

RETURN VALUES
       Upon successful completion, the initgroups() function returns 0 (zero). If the initgroups() function fails, 1 is returned and errno is  set
       to indicate the error.

ERRORS
       If the initgroups() function fails, errno may be set to the following value: The calling process does not have the appropriate privilege in
       its current effective privilege set.

RELATED INFORMATION
       Functions: getgroups(2), setgroups(2), getgid(2) sia_get_groups(3)

       Commands: groups(1) delim off

																     initgroups(3)