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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> | |
f23f6e08 AV |
11 | #include <linux/fs.h> |
12 | #include <linux/sched.h> | |
1da177e4 LT |
13 | #include <asm/uaccess.h> |
14 | ||
70674f95 AK |
15 | /* ~832 bytes of stack space used max in sys_select/sys_poll before allocating |
16 | additional memory. */ | |
17 | #define MAX_STACK_ALLOC 832 | |
18 | #define FRONTEND_STACK_ALLOC 256 | |
19 | #define SELECT_STACK_ALLOC FRONTEND_STACK_ALLOC | |
20 | #define POLL_STACK_ALLOC FRONTEND_STACK_ALLOC | |
21 | #define WQUEUES_STACK_ALLOC (MAX_STACK_ALLOC - FRONTEND_STACK_ALLOC) | |
22 | #define N_INLINE_POLL_ENTRIES (WQUEUES_STACK_ALLOC / sizeof(struct poll_table_entry)) | |
23 | ||
dd23aae4 AD |
24 | #define DEFAULT_POLLMASK (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM) |
25 | ||
1da177e4 LT |
26 | struct poll_table_struct; |
27 | ||
28 | /* | |
29 | * structures and helpers for f_op->poll implementations | |
30 | */ | |
31 | typedef void (*poll_queue_proc)(struct file *, wait_queue_head_t *, struct poll_table_struct *); | |
32 | ||
33 | typedef struct poll_table_struct { | |
34 | poll_queue_proc qproc; | |
35 | } poll_table; | |
36 | ||
37 | static inline void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p) | |
38 | { | |
39 | if (p && wait_address) | |
40 | p->qproc(filp, wait_address, p); | |
41 | } | |
42 | ||
43 | static inline void init_poll_funcptr(poll_table *pt, poll_queue_proc qproc) | |
44 | { | |
45 | pt->qproc = qproc; | |
46 | } | |
47 | ||
70674f95 AK |
48 | struct poll_table_entry { |
49 | struct file * filp; | |
50 | wait_queue_t wait; | |
51 | wait_queue_head_t * wait_address; | |
52 | }; | |
53 | ||
1da177e4 LT |
54 | /* |
55 | * Structures and helpers for sys_poll/sys_poll | |
56 | */ | |
57 | struct poll_wqueues { | |
58 | poll_table pt; | |
59 | struct poll_table_page * table; | |
60 | int error; | |
70674f95 AK |
61 | int inline_index; |
62 | struct poll_table_entry inline_entries[N_INLINE_POLL_ENTRIES]; | |
1da177e4 LT |
63 | }; |
64 | ||
65 | extern void poll_initwait(struct poll_wqueues *pwq); | |
66 | extern void poll_freewait(struct poll_wqueues *pwq); | |
67 | ||
68 | /* | |
69 | * Scaleable version of the fd_set. | |
70 | */ | |
71 | ||
72 | typedef struct { | |
73 | unsigned long *in, *out, *ex; | |
74 | unsigned long *res_in, *res_out, *res_ex; | |
75 | } fd_set_bits; | |
76 | ||
77 | /* | |
78 | * How many longwords for "nr" bits? | |
79 | */ | |
80 | #define FDS_BITPERLONG (8*sizeof(long)) | |
81 | #define FDS_LONGS(nr) (((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG) | |
82 | #define FDS_BYTES(nr) (FDS_LONGS(nr)*sizeof(long)) | |
83 | ||
84 | /* | |
85 | * We do a VERIFY_WRITE here even though we are only reading this time: | |
86 | * we'll write to it eventually.. | |
87 | * | |
88 | * Use "unsigned long" accesses to let user-mode fd_set's be long-aligned. | |
89 | */ | |
90 | static inline | |
91 | int get_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) | |
92 | { | |
93 | nr = FDS_BYTES(nr); | |
94 | if (ufdset) | |
95 | return copy_from_user(fdset, ufdset, nr) ? -EFAULT : 0; | |
96 | ||
97 | memset(fdset, 0, nr); | |
98 | return 0; | |
99 | } | |
100 | ||
101 | static inline unsigned long __must_check | |
102 | set_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) | |
103 | { | |
104 | if (ufdset) | |
105 | return __copy_to_user(ufdset, fdset, FDS_BYTES(nr)); | |
106 | return 0; | |
107 | } | |
108 | ||
109 | static inline | |
110 | void zero_fd_set(unsigned long nr, unsigned long *fdset) | |
111 | { | |
112 | memset(fdset, 0, FDS_BYTES(nr)); | |
113 | } | |
114 | ||
9f72949f DW |
115 | #define MAX_INT64_SECONDS (((s64)(~((u64)0)>>1)/HZ)-1) |
116 | ||
117 | extern int do_select(int n, fd_set_bits *fds, s64 *timeout); | |
118 | extern int do_sys_poll(struct pollfd __user * ufds, unsigned int nfds, | |
119 | s64 *timeout); | |
a2dcb44c AV |
120 | extern int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp, |
121 | fd_set __user *exp, s64 *timeout); | |
1da177e4 LT |
122 | |
123 | #endif /* KERNEL */ | |
124 | ||
125 | #endif /* _LINUX_POLL_H */ |