.TH TYPES 5
.CT 2 sa data_man
.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 the operating system.
Some data of these types are useful in user code.
.PP
.EX
.ta \w'typedef 'u +\w'unsigned short 'u +\w'label_t[14]; 'u
typedef	long	daddr_t;	\fRdisk block number, see \fIfilsys\fR(5)\f5
typedef	char *	caddr_t;	\fRgeneral memory pointer\f5
typedef	unsigned short	ino_t;	\fRinode number, \fIfilsys\fR(5)\f5
typedef	long	size_t;	\fRfile size, \fIstat\fR(2)\f5
typedef	long	time_t;	\fRtime, \fItime\fR(2)\f5
typedef	unsigned short	dev_t;	\fRdevice code, \fIstat\fR(2)\f5
typedef	long	off_t;	\fRfile offset, \fIlseek\fR(2)\f5
.EE
.PP
The following macros analyze and synthesize device numbers;
see
.IR intro (4).
.PP
.EX
#define	major(x)	((int)(((unsigned)(x)>>8)&0377))
#define	minor(x)	((int)((x)&0377))
#define	makedev(x,y)	((dev_t)(((x)<<8) | (y)))
.EE
.PP
The file contains other definitions as well,
internal to the system
or specific to particular system calls.
Pages in section 2
tell which calls need
.BR <sys/types.h> .
.SH SEE ALSO
.IR filsys (5), 
.IR time (2),
.IR intro (4)