[mirror_ubuntu-artful-kernel.git] / include / linux / poll.h

#ifndef _LINUX_POLL_H
#define _LINUX_POLL_H

#include <asm/poll.h>

#ifdef __KERNEL__

#include <linux/compiler.h>
#include <linux/wait.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <asm/uaccess.h>

struct poll_table_struct;

/* 
 * structures and helpers for f_op->poll implementations
 */
typedef void (*poll_queue_proc)(struct file *, wait_queue_head_t *, struct poll_table_struct *);

typedef struct poll_table_struct {
	poll_queue_proc qproc;
} poll_table;

static inline void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p)
{
	if (p && wait_address)
		p->qproc(filp, wait_address, p);
}

static inline void init_poll_funcptr(poll_table *pt, poll_queue_proc qproc)
{
	pt->qproc = qproc;
}

/*
 * Structures and helpers for sys_poll/sys_poll
 */
struct poll_wqueues {
	poll_table pt;
	struct poll_table_page * table;
	int error;
};

extern void poll_initwait(struct poll_wqueues *pwq);
extern void poll_freewait(struct poll_wqueues *pwq);

/*
 * Scaleable version of the fd_set.
 */

typedef struct {
	unsigned long *in, *out, *ex;
	unsigned long *res_in, *res_out, *res_ex;
} fd_set_bits;

/*
 * How many longwords for "nr" bits?
 */
#define FDS_BITPERLONG	(8*sizeof(long))
#define FDS_LONGS(nr)	(((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG)
#define FDS_BYTES(nr)	(FDS_LONGS(nr)*sizeof(long))

/*
 * We do a VERIFY_WRITE here even though we are only reading this time:
 * we'll write to it eventually..
 *
 * Use "unsigned long" accesses to let user-mode fd_set's be long-aligned.
 */
static inline
int get_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset)
{
	nr = FDS_BYTES(nr);
	if (ufdset)
		return copy_from_user(fdset, ufdset, nr) ? -EFAULT : 0;

	memset(fdset, 0, nr);
	return 0;
}

static inline unsigned long __must_check
set_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset)
{
	if (ufdset)
		return __copy_to_user(ufdset, fdset, FDS_BYTES(nr));
	return 0;
}

static inline
void zero_fd_set(unsigned long nr, unsigned long *fdset)
{
	memset(fdset, 0, FDS_BYTES(nr));
}

#define MAX_INT64_SECONDS (((s64)(~((u64)0)>>1)/HZ)-1)

extern int do_select(int n, fd_set_bits *fds, s64 *timeout);
extern int do_sys_poll(struct pollfd __user * ufds, unsigned int nfds,
		       s64 *timeout);

#endif /* KERNEL */

#endif /* _LINUX_POLL_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_POLL_H
	2	#define _LINUX_POLL_H
	3
	4	#include <asm/poll.h>
	5
	6	#ifdef __KERNEL__
	7
	8	#include <linux/compiler.h>
	9	#include <linux/wait.h>
	10	#include <linux/string.h>
	11	#include <linux/mm.h>
	12	#include <asm/uaccess.h>
	13
	14	struct poll_table_struct;
	15
	16	/*
	17	* structures and helpers for f_op->poll implementations
	18	*/
	19	typedef void (poll_queue_proc)(struct file , wait_queue_head_t , struct poll_table_struct );
	20
	21	typedef struct poll_table_struct {
	22	poll_queue_proc qproc;
	23	} poll_table;
	24
	25	static inline void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p)
	26	{
	27	if (p && wait_address)
	28	p->qproc(filp, wait_address, p);
	29	}
	30
	31	static inline void init_poll_funcptr(poll_table *pt, poll_queue_proc qproc)
	32	{
	33	pt->qproc = qproc;
	34	}
	35
	36	/*
	37	* Structures and helpers for sys_poll/sys_poll
	38	*/
	39	struct poll_wqueues {
	40	poll_table pt;
	41	struct poll_table_page * table;
	42	int error;
	43	};
	44
	45	extern void poll_initwait(struct poll_wqueues *pwq);
	46	extern void poll_freewait(struct poll_wqueues *pwq);
	47
	48	/*
	49	* Scaleable version of the fd_set.
	50	*/
	51
	52	typedef struct {
	53	unsigned long in, out, *ex;
	54	unsigned long res_in, res_out, *res_ex;
	55	} fd_set_bits;
	56
	57	/*
	58	* How many longwords for "nr" bits?
	59	*/
	60	#define FDS_BITPERLONG (8*sizeof(long))
	61	#define FDS_LONGS(nr) (((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG)
	62	#define FDS_BYTES(nr) (FDS_LONGS(nr)*sizeof(long))
	63
	64	/*
65	* We do a VERIFY_WRITE here even though we are only reading this time:
66	* we'll write to it eventually..
67	*
68	* Use "unsigned long" accesses to let user-mode fd_set's be long-aligned.
69	*/
70	static inline
71	int get_fd_set(unsigned long nr, void __user ufdset, unsigned long fdset)
72	{
73	nr = FDS_BYTES(nr);
74	if (ufdset)
75	return copy_from_user(fdset, ufdset, nr) ? -EFAULT : 0;
76
77	memset(fdset, 0, nr);
78	return 0;
79	}
80
81	static inline unsigned long __must_check
82	set_fd_set(unsigned long nr, void __user ufdset, unsigned long fdset)
83	{
84	if (ufdset)
85	return __copy_to_user(ufdset, fdset, FDS_BYTES(nr));
86	return 0;
87	}
88
89	static inline
90	void zero_fd_set(unsigned long nr, unsigned long *fdset)
91	{
92	memset(fdset, 0, FDS_BYTES(nr));
93	}
94
9f72949f DW	95	#define MAX_INT64_SECONDS (((s64)(~((u64)0)>>1)/HZ)-1)
	96
	97	extern int do_select(int n, fd_set_bits fds, s64 timeout);
	98	extern int do_sys_poll(struct pollfd __user * ufds, unsigned int nfds,
	99	s64 *timeout);
1da177e4 LT	100
	101	#endif /* KERNEL */
	102
	103	#endif /* _LINUX_POLL_H */