TYPES(5)

NAME
types - system data types

SYNOPSIS
#include <sys/types.h>

DESCRIPTION
The file sys/types.h contains the defined data types used in the kernel (most are used through out the system).

    #ifndef _TYPES_H_
    #define	_TYPES_H_
    typedef	short	dev_t;
    #ifndef _POSIX_SOURCE
    					/* major part of a device */
    #define	major(x)	((int)(((unsigned)(x)>>8)&0377))
    					/* minor part of a device */
    #define	minor(x)	((int)((x)&0377))
    					/* make a device number */
    #define	makedev(x,y)	((dev_t)(((x)<<8) | (y)))
    #endif
    typedef	unsigned char	u_char;
    typedef	unsigned short	u_short;
    typedef	unsigned int	u_int;
    typedef	unsigned long	u_long;
    typedef	unsigned short	ushort;		/* Sys V compatibility */
    #include <machine/ansi.h>
    #if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
    #include <machine/types.h>
    #endif
    #ifdef	_CLOCK_T_
    typedef	_CLOCK_T_	clock_t;
    #undef	_CLOCK_T_
    #endif
    #ifdef	_SIZE_T_
    typedef	_SIZE_T_	size_t;
    #undef	_SIZE_T_
    #endif
    #ifdef	_TIME_T_
    typedef	_TIME_T_	time_t;
    #undef	_TIME_T_
    #endif
    #ifndef _POSIX_SOURCE
    typedef	struct	_uquad { unsigned long val[2]; } u_quad;
    typedef	struct	_quad { long val[2]; } quad;
    #endif
    typedef	long *	qaddr_t;	/* should be typedef quad * qaddr_t; */
    typedef	long	daddr_t;
    typedef	char *	caddr_t;
    typedef	u_long	ino_t;
    typedef	long	swblk_t;
    typedef	long	segsz_t;
    typedef	long	off_t;
    typedef	u_short	uid_t;
    typedef	u_short	gid_t;
    typedef	short	pid_t;
    typedef	u_short	nlink_t;
    typedef	u_short	mode_t;
    typedef u_long	fixpt_t;
    #ifndef _POSIX_SOURCE
    #define	NBBY	8		/* number of bits in a byte */
    /*
     * Select uses bit masks of file descriptors in longs.  These macros
     * manipulate such bit fields (the filesystem macros use chars).
     * FD_SETSIZE may be defined by the user, but the default here should
     * be >= NOFILE (param.h).
     */
    #ifndef	FD_SETSIZE
    #define	FD_SETSIZE	256
    #endif
    typedef long	fd_mask;
    #define NFDBITS	(sizeof(fd_mask) * NBBY)	/* bits per mask */
    #ifndef howmany
    #define	howmany(x, y)	(((x)+((y)-1))/(y))
    #endif
    typedef	struct fd_set {
    	fd_mask	fds_bits[howmany(FD_SETSIZE, NFDBITS)];
    } fd_set;
    #define	FD_SET(n, p)	((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
    #define	FD_CLR(n, p)	((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
    #define	FD_ISSET(n, p)	((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
    #define	FD_ZERO(p)	bzero((char *)(p), sizeof(*(p)))
    #endif /* !_POSIX_SOURCE */
    #endif /* !_TYPES_H_ */

SEE ALSO
fs(5), time(3), lseek(2), adb(1)

HISTORY
A types file appeared in AT&T UNIX.