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.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)
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