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initgroups(3)
NAME
  initgroups - Initialize concurrent group set

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

LIBRARY
  Standard C Library (libc)

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.

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.

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.

SEE ALSO
  Functions: getgroups(2), setgroups(2), getgid(2) sia_get_groups(3)

  Commands: groups(1)

Index for Section 3

Alphabetical listing for I

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