glibc/sysdeps/unix/sysv/linux/sys/param.h

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#ifndef _SYS_PARAM_H
#define _SYS_PARAM_H
#include <limits.h>
#include <linux/limits.h>
#include <linux/param.h>
#include <sys/types.h>
/* Don't change it. H.J. */
#ifdef OLD_LINUX
#undef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 8 /* max length of hostname */
#endif
#ifndef howmany
#define howmany(x, y) (((x)+((y)-1))/(y))
#endif
#ifndef roundup
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
#endif
#define MAXPATHLEN PATH_MAX
#define NOFILE OPEN_MAX
/* Following the information of some of the kernel people I here assume
* that block size (i.e. the value of stat.st_blocks) for all filesystem
* is 512 bytes. If not tell me or HJ. -- Uli */
#define DEV_BSIZE 512
#endif