| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |