busybox/libbb/sysconf.c
Denys Vlasenko ca9c4653a9 libbb: add sanity check in bb_arg_max()
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2014-12-24 01:46:29 +01:00

31 lines
648 B
C

/* vi: set sw=4 ts=4: */
/*
* Various system configuration helpers.
*
* Copyright (C) 2014 Bartosz Golaszewski <bartekgola@gmail.com>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
#if !defined(bb_arg_max)
unsigned FAST_FUNC bb_arg_max(void)
{
long r = sysconf(_SC_ARG_MAX);
/* I've seen a version of uclibc which returned -1.
* Guard about it, and also avoid insanely large values
*/
if ((unsigned long)r > 64*1024*1024)
r = 64*1024*1024;
return r;
}
#endif
/* Return the number of clock ticks per second. */
unsigned FAST_FUNC bb_clk_tck(void)
{
return sysconf(_SC_CLK_TCK);
}