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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [linux/] [poll.h] - Blame information for rev 1275

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#ifndef _LINUX_POLL_H
#define _LINUX_POLL_H
 
#include <asm/poll.h>
 
#ifdef __KERNEL__
 
#include <linux/wait.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <asm/uaccess.h>
 
struct poll_table_page;
 
typedef struct poll_table_struct {
        int error;
        struct poll_table_page * table;
} poll_table;
 
extern void __pollwait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p);
 
static inline void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p)
{
        if (p && wait_address)
                __pollwait(filp, wait_address, p);
}
 
static inline void poll_initwait(poll_table* pt)
{
        pt->error = 0;
        pt->table = NULL;
}
extern void poll_freewait(poll_table* pt);
 
 
/*
 * 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 *ufdset, unsigned long *fdset)
{
        nr = FDS_BYTES(nr);
        if (ufdset) {
                int error;
                error = verify_area(VERIFY_WRITE, ufdset, nr);
                if (!error && __copy_from_user(fdset, ufdset, nr))
                        error = -EFAULT;
                return error;
        }
        memset(fdset, 0, nr);
        return 0;
}
 
static inline
void set_fd_set(unsigned long nr, void *ufdset, unsigned long *fdset)
{
        if (ufdset)
                __copy_to_user(ufdset, fdset, FDS_BYTES(nr));
}
 
static inline
void zero_fd_set(unsigned long nr, unsigned long *fdset)
{
        memset(fdset, 0, FDS_BYTES(nr));
}
 
extern int do_select(int n, fd_set_bits *fds, long *timeout);
 
#endif /* KERNEL */
 
#endif /* _LINUX_POLL_H */

Line No.	Rev	Author	Line
1	1275	phoenix	`#ifndef _LINUX_POLL_H`
2			`#define _LINUX_POLL_H`
3
4			`#include <asm/poll.h>`
5
6			`#ifdef __KERNEL__`
7
8			`#include <linux/wait.h>`
9			`#include <linux/string.h>`
10			`#include <linux/mm.h>`
11			`#include <asm/uaccess.h>`
12
13			`struct poll_table_page;`
14
15			`typedef struct poll_table_struct {`
16			`int error;`
17			`struct poll_table_page * table;`
18			`} poll_table;`
19
20			`extern void __pollwait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p);`
21
22			`static inline void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p)`
23			`{`
24			`if (p && wait_address)`
25			`__pollwait(filp, wait_address, p);`
26			`}`
27
28			`static inline void poll_initwait(poll_table* pt)`
29			`{`
30			`pt->error = 0;`
31			`pt->table = NULL;`
32			`}`
33			`extern void poll_freewait(poll_table* pt);`
34
35
36			`/*`
37			`* Scaleable version of the fd_set.`
38			`*/`
39
40			`typedef struct {`
41			`unsigned long in, out, *ex;`
42			`unsigned long res_in, res_out, *res_ex;`
43			`} fd_set_bits;`
44
45			`/*`
46			`* How many longwords for "nr" bits?`
47			`*/`
48			`#define FDS_BITPERLONG (8*sizeof(long))`
49			`#define FDS_LONGS(nr) (((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG)`
50			`#define FDS_BYTES(nr) (FDS_LONGS(nr)*sizeof(long))`
51
52			`/*`
53			`* We do a VERIFY_WRITE here even though we are only reading this time:`
54			`* we'll write to it eventually..`
55			`*`
56			`* Use "unsigned long" accesses to let user-mode fd_set's be long-aligned.`
57			`*/`
58			`static inline`
59			`int get_fd_set(unsigned long nr, void ufdset, unsigned long fdset)`
60			`{`
61			`nr = FDS_BYTES(nr);`
62			`if (ufdset) {`
63			`int error;`
64			`error = verify_area(VERIFY_WRITE, ufdset, nr);`
65			`if (!error && __copy_from_user(fdset, ufdset, nr))`
66			`error = -EFAULT;`
67			`return error;`
68			`}`
69			`memset(fdset, 0, nr);`
70			`return 0;`
71			`}`
72
73			`static inline`
74			`void set_fd_set(unsigned long nr, void ufdset, unsigned long fdset)`
75			`{`
76			`if (ufdset)`
77			`__copy_to_user(ufdset, fdset, FDS_BYTES(nr));`
78			`}`
79
80			`static inline`
81			`void zero_fd_set(unsigned long nr, unsigned long *fdset)`
82			`{`
83			`memset(fdset, 0, FDS_BYTES(nr));`
84			`}`
85
86			`extern int do_select(int n, fd_set_bits fds, long timeout);`
87
88			`#endif /* KERNEL */`
89
90			`#endif /* _LINUX_POLL_H */`

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [linux/] [poll.h] - Blame information for rev 1275