blob: 8c1caef5cd73e7d367d1af261a6137b98d59b4e7
| 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) |
| 12 | unsigned 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. */ |
| 27 | unsigned FAST_FUNC bb_clk_tck(void) |
| 28 | { |
| 29 | return sysconf(_SC_CLK_TCK); |
| 30 | } |
| 31 |