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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; | |
4938d7e0 | 35 | unsigned long key; |
1da177e4 LT |
36 | } poll_table; |
37 | ||
38 | static inline void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p) | |
39 | { | |
40 | if (p && wait_address) | |
41 | p->qproc(filp, wait_address, p); | |
42 | } | |
43 | ||
44 | static inline void init_poll_funcptr(poll_table *pt, poll_queue_proc qproc) | |
45 | { | |
46 | pt->qproc = qproc; | |
4938d7e0 | 47 | pt->key = ~0UL; /* all events enabled */ |
1da177e4 LT |
48 | } |
49 | ||
70674f95 | 50 | struct poll_table_entry { |
5f820f64 | 51 | struct file *filp; |
4938d7e0 | 52 | unsigned long key; |
70674f95 | 53 | wait_queue_t wait; |
5f820f64 | 54 | wait_queue_head_t *wait_address; |
70674f95 AK |
55 | }; |
56 | ||
1da177e4 LT |
57 | /* |
58 | * Structures and helpers for sys_poll/sys_poll | |
59 | */ | |
60 | struct poll_wqueues { | |
61 | poll_table pt; | |
5f820f64 TH |
62 | struct poll_table_page *table; |
63 | struct task_struct *polling_task; | |
64 | int triggered; | |
1da177e4 | 65 | int error; |
70674f95 AK |
66 | int inline_index; |
67 | struct poll_table_entry inline_entries[N_INLINE_POLL_ENTRIES]; | |
1da177e4 LT |
68 | }; |
69 | ||
70 | extern void poll_initwait(struct poll_wqueues *pwq); | |
71 | extern void poll_freewait(struct poll_wqueues *pwq); | |
5f820f64 TH |
72 | extern int poll_schedule_timeout(struct poll_wqueues *pwq, int state, |
73 | ktime_t *expires, unsigned long slack); | |
74 | ||
75 | static inline int poll_schedule(struct poll_wqueues *pwq, int state) | |
76 | { | |
77 | return poll_schedule_timeout(pwq, state, NULL, 0); | |
78 | } | |
1da177e4 LT |
79 | |
80 | /* | |
81 | * Scaleable version of the fd_set. | |
82 | */ | |
83 | ||
84 | typedef struct { | |
85 | unsigned long *in, *out, *ex; | |
86 | unsigned long *res_in, *res_out, *res_ex; | |
87 | } fd_set_bits; | |
88 | ||
89 | /* | |
90 | * How many longwords for "nr" bits? | |
91 | */ | |
92 | #define FDS_BITPERLONG (8*sizeof(long)) | |
93 | #define FDS_LONGS(nr) (((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG) | |
94 | #define FDS_BYTES(nr) (FDS_LONGS(nr)*sizeof(long)) | |
95 | ||
96 | /* | |
97 | * We do a VERIFY_WRITE here even though we are only reading this time: | |
98 | * we'll write to it eventually.. | |
99 | * | |
100 | * Use "unsigned long" accesses to let user-mode fd_set's be long-aligned. | |
101 | */ | |
102 | static inline | |
103 | int get_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) | |
104 | { | |
105 | nr = FDS_BYTES(nr); | |
106 | if (ufdset) | |
107 | return copy_from_user(fdset, ufdset, nr) ? -EFAULT : 0; | |
108 | ||
109 | memset(fdset, 0, nr); | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static inline unsigned long __must_check | |
114 | set_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) | |
115 | { | |
116 | if (ufdset) | |
117 | return __copy_to_user(ufdset, fdset, FDS_BYTES(nr)); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static inline | |
122 | void zero_fd_set(unsigned long nr, unsigned long *fdset) | |
123 | { | |
124 | memset(fdset, 0, FDS_BYTES(nr)); | |
125 | } | |
126 | ||
9f72949f DW |
127 | #define MAX_INT64_SECONDS (((s64)(~((u64)0)>>1)/HZ)-1) |
128 | ||
8ff3e8e8 | 129 | extern int do_select(int n, fd_set_bits *fds, struct timespec *end_time); |
9f72949f | 130 | extern int do_sys_poll(struct pollfd __user * ufds, unsigned int nfds, |
8ff3e8e8 | 131 | struct timespec *end_time); |
a2dcb44c | 132 | extern int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp, |
8ff3e8e8 | 133 | fd_set __user *exp, struct timespec *end_time); |
1da177e4 | 134 | |
b773ad40 TG |
135 | extern int poll_select_set_timeout(struct timespec *to, long sec, long nsec); |
136 | ||
1da177e4 LT |
137 | #endif /* KERNEL */ |
138 | ||
139 | #endif /* _LINUX_POLL_H */ |