u-boot/include/asm-i386/posix_types.h

#ifndef __ARCH_I386_POSIX_TYPES_H
#define __ARCH_I386_POSIX_TYPES_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 short	__kernel_dev_t;
typedef unsigned long	__kernel_ino_t;
typedef unsigned short	__kernel_mode_t;
typedef unsigned short	__kernel_nlink_t;
typedef long		__kernel_off_t;
typedef int		__kernel_pid_t;
typedef unsigned short	__kernel_ipc_pid_t;
typedef unsigned short	__kernel_uid_t;
typedef unsigned short	__kernel_gid_t;
typedef unsigned int	__kernel_size_t;
typedef int		__kernel_ssize_t;
typedef int		__kernel_ptrdiff_t;
typedef long		__kernel_time_t;
typedef long		__kernel_suseconds_t;
typedef long		__kernel_clock_t;
typedef int		__kernel_daddr_t;
typedef char *		__kernel_caddr_t;
typedef unsigned short	__kernel_uid16_t;
typedef unsigned short	__kernel_gid16_t;
typedef unsigned int	__kernel_uid32_t;
typedef unsigned int	__kernel_gid32_t;

typedef unsigned short	__kernel_old_uid_t;
typedef unsigned short	__kernel_old_gid_t;

#ifdef __GNUC__
typedef long long	__kernel_loff_t;
#endif

typedef struct {
#if defined(__KERNEL__) || defined(__USE_ALL)
	int	val[2];
#else /* !defined(__KERNEL__) && !defined(__USE_ALL) */
	int	__val[2];
#endif /* !defined(__KERNEL__) && !defined(__USE_ALL) */
} __kernel_fsid_t;

#if defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2)

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

#undef	__FD_CLR
#define __FD_CLR(fd,fdsetp) \
		__asm__ __volatile__("btrl %1,%0": \
			"=m" (*(__kernel_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" (*(__kernel_fd_set *) (fdsetp))); \
		__result; }))

#undef	__FD_ZERO
#define __FD_ZERO(fdsetp) \
do { \
	int __d0, __d1; \
	__asm__ __volatile__("cld ; rep ; stosl" \
			:"=m" (*(__kernel_fd_set *) (fdsetp)), \
			  "=&c" (__d0), "=&D" (__d1) \
			:"a" (0), "1" (__FDSET_LONGS), \
			"2" ((__kernel_fd_set *) (fdsetp)) : "memory"); \
} while (0)

#endif /* defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2) */

#endif