Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 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_struct; |
||
| 14 | |||
| 15 | /* |
||
| 16 | * structures and helpers for f_op->poll implementations |
||
| 17 | */ |
||
| 18 | typedef void (*poll_queue_proc)(struct file *, wait_queue_head_t *, struct poll_table_struct *); |
||
| 19 | |||
| 20 | typedef struct poll_table_struct { |
||
| 21 | poll_queue_proc qproc; |
||
| 22 | } poll_table; |
||
| 23 | |||
| 24 | static inline void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p) |
||
| 25 | { |
||
| 26 | if (p && wait_address) |
||
| 27 | p->qproc(filp, wait_address, p); |
||
| 28 | } |
||
| 29 | |||
| 30 | static inline void init_poll_funcptr(poll_table *pt, poll_queue_proc qproc) |
||
| 31 | { |
||
| 32 | pt->qproc = qproc; |
||
| 33 | } |
||
| 34 | |||
| 35 | /* |
||
| 36 | * Structures and helpers for sys_poll/sys_poll |
||
| 37 | */ |
||
| 38 | struct poll_wqueues { |
||
| 39 | poll_table pt; |
||
| 40 | struct poll_table_page * table; |
||
| 41 | int error; |
||
| 42 | }; |
||
| 43 | |||
| 44 | extern void poll_initwait(struct poll_wqueues *pwq); |
||
| 45 | extern void poll_freewait(struct poll_wqueues *pwq); |
||
| 46 | |||
| 47 | /* |
||
| 48 | * Scaleable version of the fd_set. |
||
| 49 | */ |
||
| 50 | |||
| 51 | typedef struct { |
||
| 52 | unsigned long *in, *out, *ex; |
||
| 53 | unsigned long *res_in, *res_out, *res_ex; |
||
| 54 | } fd_set_bits; |
||
| 55 | |||
| 56 | /* |
||
| 57 | * How many longwords for "nr" bits? |
||
| 58 | */ |
||
| 59 | #define FDS_BITPERLONG (8*sizeof(long)) |
||
| 60 | #define FDS_LONGS(nr) (((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG) |
||
| 61 | #define FDS_BYTES(nr) (FDS_LONGS(nr)*sizeof(long)) |
||
| 62 | |||
| 63 | /* |
||
| 64 | * We do a VERIFY_WRITE here even though we are only reading this time: |
||
| 65 | * we'll write to it eventually.. |
||
| 66 | * |
||
| 67 | * Use "unsigned long" accesses to let user-mode fd_set's be long-aligned. |
||
| 68 | */ |
||
| 69 | static inline |
||
| 70 | int get_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) |
||
| 71 | { |
||
| 72 | nr = FDS_BYTES(nr); |
||
| 73 | if (ufdset) { |
||
| 74 | int error; |
||
| 75 | error = verify_area(VERIFY_WRITE, ufdset, nr); |
||
| 76 | if (!error && __copy_from_user(fdset, ufdset, nr)) |
||
| 77 | error = -EFAULT; |
||
| 78 | return error; |
||
| 79 | } |
||
| 80 | memset(fdset, 0, nr); |
||
| 81 | return 0; |
||
| 82 | } |
||
| 83 | |||
| 84 | static inline |
||
| 85 | void set_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) |
||
| 86 | { |
||
| 87 | if (ufdset) |
||
| 88 | __copy_to_user(ufdset, fdset, FDS_BYTES(nr)); |
||
| 89 | } |
||
| 90 | |||
| 91 | static inline |
||
| 92 | void zero_fd_set(unsigned long nr, unsigned long *fdset) |
||
| 93 | { |
||
| 94 | memset(fdset, 0, FDS_BYTES(nr)); |
||
| 95 | } |
||
| 96 | |||
| 97 | extern int do_select(int n, fd_set_bits *fds, long *timeout); |
||
| 98 | |||
| 99 | #endif /* KERNEL */ |
||
| 100 | |||
| 101 | #endif /* _LINUX_POLL_H */ |