types.h

LINUX1.0内核源代码,学习LINUX编程的一定要看。

#ifndef _LINUX_TYPES_H
#define _LINUX_TYPES_H

#ifndef _SIZE_T
#define _SIZE_T
typedef unsigned int size_t;
#endif

#ifndef _SSIZE_T
#define _SSIZE_T
typedef int ssize_t;
#endif

#ifndef _TIME_T
#define _TIME_T
typedef long time_t;
#endif

#ifndef _CLOCK_T
#define _CLOCK_T
typedef long clock_t;
#endif

#ifndef _PTRDIFF_T
#define _PTRDIFF_T
typedef int ptrdiff_t;
#endif

#ifndef NULL
#define NULL ((void *) 0)
#endif

typedef int pid_t;
typedef unsigned short uid_t;
typedef unsigned short gid_t;
typedef unsigned short dev_t;
#ifdef OLD_LINUX
typedef unsigned short ino_t;
#else
typedef unsigned long ino_t;
#endif
typedef unsigned short mode_t;
typedef unsigned short umode_t;
typedef unsigned short nlink_t;
typedef int daddr_t;
typedef long off_t;

/* bsd */
typedef unsigned char u_char;
typedef unsigned short u_short;
typedef unsigned int u_int;
typedef unsigned long u_long;

/* sysv */
typedef unsigned char unchar;
typedef unsigned short ushort;
typedef unsigned int uint;
typedef unsigned long ulong;

typedef char *caddr_t;

typedef unsigned char cc_t;
typedef unsigned int speed_t;
typedef unsigned long tcflag_t;

/*
 * This allows for 256 file descriptors: if NR_OPEN is ever grown beyond that
 * you'll have to change this too. But 256 fd's seem to be enough even for such
 * "real" unices like SunOS, so hopefully this is one limit that doesn't have
 * to be changed.
 *
 * Note that POSIX wants the FD_CLEAR(fd,fdsetp) defines to be in <sys/time.h>
 * (and thus <linux/time.h>) - but this is a more logical place for them. Solved
 * by having dummy defines in <sys/time.h>.
 */

/*
 * Those macros may have been defined in <gnu/types.h>. But we always
 * use the ones here. 
 */
#undef __FDSET_LONGS
#define __FDSET_LONGS 8

typedef struct fd_set {
	unsigned long fds_bits [__FDSET_LONGS];
} fd_set;

#undef __NFDBITS
#define __NFDBITS	(8 * sizeof(unsigned long))

#undef __FD_SETSIZE
#define __FD_SETSIZE	(__FDSET_LONGS*__NFDBITS)

#undef	__FD_SET
#define __FD_SET(fd,fdsetp) \
		__asm__ __volatile__("btsl %1,%0": \
			"=m" (*(fd_set *) (fdsetp)):"r" ((int) (fd)))

#undef	__FD_CLR
#define __FD_CLR(fd,fdsetp) \
		__asm__ __volatile__("btrl %1,%0": \
			"=m" (*(fd_set *) (fdsetp)):"r" ((int) (fd)))

#undef	__FD_ISSET
#define __FD_ISSET(fd,fdsetp) (__extension__ ({ \
		unsigned char __result; \
		__asm__ __volatile__("btl %1,%2 ; setb %0" \
			:"=q" (__result) :"r" ((int) (fd)), \
			"m" (*(fd_set *) (fdsetp))); \
		__result; }))

#undef	__FD_ZERO
#define __FD_ZERO(fdsetp) \
		__asm__ __volatile__("cld ; rep ; stosl" \
			:"=m" (*(fd_set *) (fdsetp)) \
			:"a" (0), "c" (__FDSET_LONGS), \
			"D" ((fd_set *) (fdsetp)) :"cx","di")

struct ustat {
	daddr_t f_tfree;
	ino_t f_tinode;
	char f_fname[6];
	char f_fpack[6];
};

#endif