arch/x86/include/asm/posix_types_64.h

#ifndef _ASM_X86_POSIX_TYPES_64_H
#define _ASM_X86_POSIX_TYPES_64_H

/*
 * This file is generally used by user-level software, so you need to
 * be a little careful about namespace pollution etc.  Also, we cannot
 * assume GCC is being used.
 */

typedef unsigned long	__kernel_ino_t;
typedef unsigned int	__kernel_mode_t;
typedef unsigned long	__kernel_nlink_t;
typedef long		__kernel_off_t;
typedef int		__kernel_pid_t;
typedef int		__kernel_ipc_pid_t;
typedef unsigned int	__kernel_uid_t;
typedef unsigned int	__kernel_gid_t;
typedef unsigned long	__kernel_size_t;
typedef long		__kernel_ssize_t;
typedef long		__kernel_ptrdiff_t;
typedef long		__kernel_time_t;
typedef long		__kernel_suseconds_t;
typedef long		__kernel_clock_t;
typedef int		__kernel_timer_t;
typedef int		__kernel_clockid_t;
typedef int		__kernel_daddr_t;
typedef char *		__kernel_caddr_t;
typedef unsigned short	__kernel_uid16_t;
typedef unsigned short	__kernel_gid16_t;

#ifdef __GNUC__
typedef long long	__kernel_loff_t;
#endif

typedef struct {
	int	val[2];
} __kernel_fsid_t;

typedef unsigned short __kernel_old_uid_t;
typedef unsigned short __kernel_old_gid_t;
typedef __kernel_uid_t __kernel_uid32_t;
typedef __kernel_gid_t __kernel_gid32_t;

typedef unsigned long	__kernel_old_dev_t;

#ifdef __KERNEL__

#undef __FD_SET
static inline void __FD_SET(unsigned long fd, __kernel_fd_set *fdsetp)
{
	unsigned long _tmp = fd / __NFDBITS;
	unsigned long _rem = fd % __NFDBITS;
	fdsetp->fds_bits[_tmp] |= (1UL<<_rem);
}

#undef __FD_CLR
static inline void __FD_CLR(unsigned long fd, __kernel_fd_set *fdsetp)
{
	unsigned long _tmp = fd / __NFDBITS;
	unsigned long _rem = fd % __NFDBITS;
	fdsetp->fds_bits[_tmp] &= ~(1UL<<_rem);
}

#undef __FD_ISSET
static inline int __FD_ISSET(unsigned long fd, __const__ __kernel_fd_set *p)
{
	unsigned long _tmp = fd / __NFDBITS;
	unsigned long _rem = fd % __NFDBITS;
	return (p->fds_bits[_tmp] & (1UL<<_rem)) != 0;
}

/*
 * This will unroll the loop for the normal constant cases (8 or 32 longs,
 * for 256 and 1024-bit fd_sets respectively)
 */
#undef __FD_ZERO
static inline void __FD_ZERO(__kernel_fd_set *p)
{
	unsigned long *tmp = p->fds_bits;
	int i;

	if (__builtin_constant_p(__FDSET_LONGS)) {
		switch (__FDSET_LONGS) {
		case 32:
			tmp[ 0] = 0; tmp[ 1] = 0; tmp[ 2] = 0; tmp[ 3] = 0;
			tmp[ 4] = 0; tmp[ 5] = 0; tmp[ 6] = 0; tmp[ 7] = 0;
			tmp[ 8] = 0; tmp[ 9] = 0; tmp[10] = 0; tmp[11] = 0;
			tmp[12] = 0; tmp[13] = 0; tmp[14] = 0; tmp[15] = 0;
			tmp[16] = 0; tmp[17] = 0; tmp[18] = 0; tmp[19] = 0;
			tmp[20] = 0; tmp[21] = 0; tmp[22] = 0; tmp[23] = 0;
			tmp[24] = 0; tmp[25] = 0; tmp[26] = 0; tmp[27] = 0;
			tmp[28] = 0; tmp[29] = 0; tmp[30] = 0; tmp[31] = 0;
			return;
		case 16:
			tmp[ 0] = 0; tmp[ 1] = 0; tmp[ 2] = 0; tmp[ 3] = 0;
			tmp[ 4] = 0; tmp[ 5] = 0; tmp[ 6] = 0; tmp[ 7] = 0;
			tmp[ 8] = 0; tmp[ 9] = 0; tmp[10] = 0; tmp[11] = 0;
			tmp[12] = 0; tmp[13] = 0; tmp[14] = 0; tmp[15] = 0;
			return;
		case 8:
			tmp[ 0] = 0; tmp[ 1] = 0; tmp[ 2] = 0; tmp[ 3] = 0;
			tmp[ 4] = 0; tmp[ 5] = 0; tmp[ 6] = 0; tmp[ 7] = 0;
			return;
		case 4:
			tmp[ 0] = 0; tmp[ 1] = 0; tmp[ 2] = 0; tmp[ 3] = 0;
			return;
		}
	}
	i = __FDSET_LONGS;
	while (i) {
		i--;
		*tmp = 0;
		tmp++;
	}
}

#endif /* defined(__KERNEL__) */

#endif /* _ASM_X86_POSIX_TYPES_64_H */