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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 | ||
95 | extern int do_select(int n, fd_set_bits *fds, long *timeout); | |
96 | ||
97 | #endif /* KERNEL */ | |
98 | ||
99 | #endif /* _LINUX_POLL_H */ |