1 #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 extern 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 */
91
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