LXR busybox/libbb/sysconf.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Various system configuration helpers.
   4 *
   5 * Copyright (C) 2014 Bartosz Golaszewski <bartekgola@gmail.com>
   6 *
   7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8 */
   9#include "libbb.h"
  10
  11#if !defined(bb_arg_max)
  12unsigned FAST_FUNC bb_arg_max(void)
  13{
  14        long r = sysconf(_SC_ARG_MAX);
  15
  16        /* I've seen a version of uclibc which returned -1.
  17         * Guard about it, and also avoid insanely large values
  18         */
  19        if ((unsigned long)r > 64*1024*1024)
  20                r = 64*1024*1024;
  21
  22        return r;
  23}
  24#endif
  25
  26/* Return the number of clock ticks per second. */
  27unsigned FAST_FUNC bb_clk_tck(void)
  28{
  29        return sysconf(_SC_CLK_TCK);
  30}
  31