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 throughout the system).

    #ifndef _SYS_TYPES_H_
    #define	_SYS_TYPES_H_
    /* Machine type dependent parameters. */
    #include <machine/types.h>
    #include <machine/ansi.h>
    #include <machine/endian.h>
    #if !defined(_POSIX_SOURCE) && !defined(_XOPEN_SOURCE)
    typedef	unsigned char	u_char;
    typedef	unsigned short	u_short;
    typedef	unsigned int	u_int;
    typedef	unsigned long	u_long;
    typedef unsigned char	unchar;		/* Sys V compatibility */
    typedef	unsigned short	ushort;		/* Sys V compatibility */
    typedef	unsigned int	uint;		/* Sys V compatibility */
    typedef unsigned long	ulong;		/* Sys V compatibility */
    #endif
    typedef	u_int64_t	u_quad_t;	/* quads */
    typedef	int64_t		quad_t;
    typedef	quad_t *	qaddr_t;
    typedef	char *		caddr_t;	/* core address */
    typedef	int32_t		daddr_t;	/* disk address */
    typedef	int32_t		dev_t;		/* device number */
    typedef	u_int32_t	fixpt_t;	/* fixed point number */
    typedef	u_int32_t	gid_t;		/* group id */
    typedef	u_int32_t	ino_t;		/* inode number */
    typedef	long		key_t;		/* IPC key (for Sys V IPC) */
    typedef	u_int16_t	mode_t;		/* permissions */
    typedef	u_int16_t	nlink_t;	/* link count */
    typedef	quad_t		off_t;		/* file offset */
    typedef	int32_t		pid_t;		/* process id */
    typedef quad_t		rlim_t;		/* resource limit */
    typedef	int32_t		segsz_t;	/* segment size */
    typedef	int32_t		swblk_t;	/* swap offset */
    typedef	u_int32_t	uid_t;		/* user id */
    #if !defined(_POSIX_SOURCE) && !defined(_XOPEN_SOURCE)
    /* Major, minor numbers, dev_t's. */
    #define	major(x)	((int32_t)(((u_int32_t)(x) >> 8) & 0xff))
    #define	minor(x)	((int32_t)((x) & 0xff))
    #define	makedev(x,y)	((dev_t)(((x) << 8) | (y)))
    #endif
    #ifdef	_BSD_CLOCK_T_
    typedef	_BSD_CLOCK_T_	clock_t;
    #undef	_BSD_CLOCK_T_
    #endif
    #ifdef	_BSD_SIZE_T_
    typedef	_BSD_SIZE_T_	size_t;
    #undef	_BSD_SIZE_T_
    #endif
    #ifdef	_BSD_SSIZE_T_
    typedef	_BSD_SSIZE_T_	ssize_t;
    #undef	_BSD_SSIZE_T_
    #endif
    #ifdef	_BSD_TIME_T_
    typedef	_BSD_TIME_T_	time_t;
    #undef	_BSD_TIME_T_
    #endif
    #ifdef	_BSD_CLOCKID_T_
    typedef	_BSD_CLOCKID_T_	clockid_t;
    #undef	_BSD_CLOCKID_T_
    #endif
    #ifdef	_BSD_TIMER_T_
    typedef	_BSD_TIMER_T_	timer_t;
    #undef	_BSD_TIMER_T_
    #endif
    #if !defined(_POSIX_SOURCE) && !defined(_XOPEN_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 enough for most uses.
     */
    #ifndef	FD_SETSIZE
    #define	FD_SETSIZE	256
    #endif
    typedef int32_t	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_COPY(f, t)	memcpy(t, f, sizeof(*(f)))
    #define	FD_ZERO(p)	memset(p, 0, sizeof(*(p)))
    #endif /* !defined(_POSIX_SOURCE) ... */
    #endif /* !_SYS_TYPES_H_ */

SEE ALSO
lseek(2), select(2), truncate(2), byteorder(3), time(3), fs(5)

HISTORY
A types file appeared in AT&T UNIX.