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initgroups(3)
NAME
  initgroups - Initializes concurrent group set

LIBRARY
  Standard C Library (libc.a)

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

PARAMETERS
  user	    Specifies the user whose groups are to be used to initialize the
	    group set.

  base_gid  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:

  [EPERM]   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)