#  File src/library/base/R/sys.R
#  Part of the R package, http://www.R-project.org
#
#  Copyright (C) 1995-2012 The R Core Team
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  A copy of the GNU General Public License is available at
#  http://www.r-project.org/Licenses/

sys.call <- function(which = 0L)
    .Internal(sys.call(which))

sys.calls <- function()
    .Internal(sys.calls())

sys.frame <- function(which = 0L)
    .Internal(sys.frame(which))

sys.function <- function(which = 0L)
    .Internal(sys.function(which))

sys.frames <- function()
    .Internal(sys.frames())

sys.nframe <- function()
    .Internal(sys.nframe())

sys.parent <- function(n = 1L)
    .Internal(sys.parent(n))

sys.parents <- function()
    .Internal(sys.parents())

sys.status <- function()
    list(sys.calls = sys.calls(), sys.parents = sys.parents(),
         sys.frames = sys.frames())

sys.on.exit <- function()
    .Internal(sys.on.exit())