.po 1i
.TH TYPES 5 Bell
.V 08/15/84 17:36:14
.\"@[$]types.5	1.6	08/15/84 17:36:14 - Zilog Inc.
.ad
.SH NAME
types \- primitive system data types
.SH SYNOPSIS
.B #include <sys/types.h>
.SH DESCRIPTION
The data types defined in the include file
are used in ZEUS system code;
some data of these types are accessible to user code:
.PP
.nf
.\" .SO /usr/include/sys/types.h
/* @[$]types.h	1.1  12/11/81 17:21:31 - Zilog Inc */
typedef   struct { int r[1]; } *physadr;
typedef   unsigned short  ushort;
typedef   char            cnt_t;
typedef   long            daddr_t;  	/* disk address      */
typedef   char            *caddr_t;  	/* core address      */
typedef   long            saddr_t;      /* segmented address */
typedef   long            paddr_t;      /* physical address  */
typedef   long            uaddr_t;      /* user address      */
typedef   unsigned in     ino_t;     	/* i-node number     */
typedef   long            time_t;   	/* a time            */
typedef   int             label_t[9]; 	/* program status    */
typedef   int             dev_t;    	/* device code       */
typedef   long            off_t;    	/* offset in file    */

	/* selectors and constructor for device code         */

#define	major(x)  	(int)(((unsigned)x>>8))
#define	minor(x)  	(int)(x&0377)
#define	makedev(x,y)	(dev_t)((x)<<8|(y))
.fi
.PP
The form
.I daddr_t
is used for disk addresses except in an
i-node on disk, see
.BR filsys (5).
Times are encoded in seconds since 00:00:00 GMT, January 1, 1970.
The major and minor parts of a device code
specify kind and unit number of a device
and are installation-dependent.
Offsets are measured in bytes from the beginning of a file.
The
.I label_t
variables are used to save the processor state
while another process is running.
.SH SEE ALSO
adb(1),
lseek(2),
time(2),
filsys(5).