| 1 | /* $Id: poll.h,v 1.1.1.1 2003/07/02 13:57:00 eleph Exp $ */
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| 2 |
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| 3 | #ifndef _LINUX_POLL_H
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| 4 | #define _LINUX_POLL_H
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| 5 |
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| 6 | #include <asm/poll.h>
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| 7 | #include <linux/mm.h>
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| 8 | #include <asm/uaccess.h>
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| 9 | #include <linux/wait.h>
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| 10 | #include <linux/fs.h>
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| 11 |
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| 12 | #ifdef __KERNEL__
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| 13 |
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| 14 | struct poll_table_entry {
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| 15 | struct file * filp;
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| 16 | wait_queue_t wait;
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| 17 | wait_queue_head_t * wait_address;
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| 18 | };
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| 19 |
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| 20 | typedef struct poll_table_struct {
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| 21 | struct poll_table_struct * next;
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| 22 | unsigned int nr;
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| 23 | struct poll_table_entry * entry;
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| 24 | } poll_table;
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| 25 |
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| 26 | #define __MAX_POLL_TABLE_ENTRIES ((PAGE_SIZE - sizeof (poll_table)) / sizeof (struct poll_table_entry))
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| 27 |
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| 28 | void init_waitqueue_head(wait_queue_head_t *q);
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| 29 |
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| 30 | extern void __pollwait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p);
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| 31 |
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| 32 | extern void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p);
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| 33 |
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| 34 | /*
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| 35 | * For the kernel fd_set we use a fixed set-size for allocation purposes.
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| 36 | * This set-size doesn't necessarily bear any relation to the size the user
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| 37 | * uses, but should preferably obviously be larger than any possible user
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| 38 | * size (NR_OPEN bits).
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| 39 | *
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| 40 | * We need 6 bitmaps (in/out/ex for both incoming and outgoing), and we
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| 41 | * allocate one page for all the bitmaps. Thus we have 8*PAGE_SIZE bits,
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| 42 | * to be divided by 6. And we'd better make sure we round to a full
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| 43 | * long-word (in fact, we'll round to 64 bytes).
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| 44 | */
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| 45 |
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| 46 |
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| 47 | #define KFDS_64BLOCK ((PAGE_SIZE/(6*64))*64)
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| 48 | #define KFDS_NR (KFDS_64BLOCK*8 > NR_OPEN ? NR_OPEN : KFDS_64BLOCK*8)
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| 49 | typedef unsigned long kernel_fd_set[KFDS_NR/__NFDBITS];
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| 50 |
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| 51 | /*
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| 52 | * Scaleable version of the fd_set.
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| 53 | */
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| 54 |
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| 55 | typedef struct {
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| 56 | unsigned long *in, *out, *ex;
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| 57 | unsigned long *res_in, *res_out, *res_ex;
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| 58 | } fd_set_bits;
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| 59 |
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| 60 | /*
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| 61 | * How many longwords for "nr" bits?
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| 62 | */
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| 63 | #define FDS_BITPERLONG (8*sizeof(long))
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| 64 | #define FDS_LONGS(nr) (((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG)
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| 65 | #define FDS_BYTES(nr) (FDS_LONGS(nr)*sizeof(long))
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| 66 |
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| 67 | /*
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| 68 | * We do a VERIFY_WRITE here even though we are only reading this time:
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| 69 | * we'll write to it eventually..
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| 70 | *
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| 71 | * Use "unsigned long" accesses to let user-mode fd_set's be long-aligned.
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| 72 | */
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| 73 | static int get_fd_set(unsigned long nr, void *ufdset, unsigned long *fdset);
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| 74 |
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| 75 | static void set_fd_set(unsigned long nr, void *ufdset, unsigned long *fdset);
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| 76 |
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| 77 | static void zero_fd_set(unsigned long nr, unsigned long *fdset);
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| 78 |
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| 79 | extern int do_select(int n, fd_set_bits *fds, long *timeout);
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| 80 |
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| 81 | #endif /* KERNEL */
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| 82 |
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| 83 | #endif /* _LINUX_POLL_H */
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