struct user {
	int	u_rsav[2];		/* must be first */
	int	u_fsav[25];		/* must be second */
	char	u_segflg;
	char	u_error;
	char	u_uid;
	char	u_gid;
	char	u_ruid;
	char	u_rgid;
	int	u_procp;
	char	*u_base;
	char	*u_count;
	char	*u_offset[2];
	int	*u_cdir;
	char	u_dbuf[DIRSIZ];
	char	*u_dirp;
	struct	(
		int	u_ino;
		char	u_name[DIRSIZ];
	) u_dent;
	int	*u_pdir;
	int	u_uisa[8];
	int	u_uisd[8];
	int	u_ofile[NOFILE];
	int	u_arg[5];
	int	u_tsize;
	int	u_dsize;
	int	u_ssize;
	int	u_qsav[2];
	int	u_ssav[2];
	int	u_signal[NSIG];
	int	u_utime;
	int	u_stime;
	int	u_cutime[2];
	int	u_cstime[2];
	int	*u_ar0;
} u;	/* u = 140000 */

/* u_error codes */
#define	EFAULT	106
#define	EPERM	1
#define	ENOENT	2
#define	ESRCH	3
#define	EIO	5
#define	ENXIO	6
#define	E2BIG	7
#define	ENOEXEC	8
#define	EBADF	9
#define	ECHILD	10
#define	EAGAIN	11
#define	ENOMEM	12
#define	EACCES	13
#define	ENOTBLK	15
#define	EBUSY	16
#define	EEXIST	17
#define	EXDEV	18
#define	ENODEV	19
#define	ENOTDIR	20
#define	EISDIR	21
#define	EINVAL	22
#define	ENFILE	23
#define	EMFILE	24
#define	ENOTTY	25
#define	ETXTBSY	26
#define	EFBIG	27
#define	ENOSPC	28