| #ifndef _LINUX_POLL_H |
| #define _LINUX_POLL_H |
| |
| #include <asm/poll.h> |
| |
| #ifdef __KERNEL__ |
| |
| #include <linux/wait.h> |
| #include <linux/string.h> |
| #include <linux/mm.h> |
| #include <asm/uaccess.h> |
| |
| struct poll_table_page; |
| |
| typedef struct poll_table_struct { |
| int error; |
| struct poll_table_page * table; |
| } poll_table; |
| |
| extern void __pollwait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p); |
| |
| static inline void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p) |
| { |
| if (p && wait_address) |
| __pollwait(filp, wait_address, p); |
| } |
| |
| static inline void poll_initwait(poll_table* pt) |
| { |
| pt->error = 0; |
| pt->table = NULL; |
| } |
| extern void poll_freewait(poll_table* pt); |
| |
| |
| /* |
| * Scaleable version of the fd_set. |
| */ |
| |
| typedef struct { |
| unsigned long *in, *out, *ex; |
| unsigned long *res_in, *res_out, *res_ex; |
| } fd_set_bits; |
| |
| /* |
| * How many longwords for "nr" bits? |
| */ |
| #define FDS_BITPERLONG (8*sizeof(long)) |
| #define FDS_LONGS(nr) (((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG) |
| #define FDS_BYTES(nr) (FDS_LONGS(nr)*sizeof(long)) |
| |
| /* |
| * We do a VERIFY_WRITE here even though we are only reading this time: |
| * we'll write to it eventually.. |
| * |
| * Use "unsigned long" accesses to let user-mode fd_set's be long-aligned. |
| */ |
| static inline |
| int get_fd_set(unsigned long nr, void *ufdset, unsigned long *fdset) |
| { |
| nr = FDS_BYTES(nr); |
| if (ufdset) { |
| int error; |
| error = verify_area(VERIFY_WRITE, ufdset, nr); |
| if (!error && __copy_from_user(fdset, ufdset, nr)) |
| error = -EFAULT; |
| return error; |
| } |
| memset(fdset, 0, nr); |
| return 0; |
| } |
| |
| static inline |
| void set_fd_set(unsigned long nr, void *ufdset, unsigned long *fdset) |
| { |
| if (ufdset) |
| __copy_to_user(ufdset, fdset, FDS_BYTES(nr)); |
| } |
| |
| static inline |
| void zero_fd_set(unsigned long nr, unsigned long *fdset) |
| { |
| memset(fdset, 0, FDS_BYTES(nr)); |
| } |
| |
| extern int do_select(int n, fd_set_bits *fds, long *timeout); |
| |
| #endif /* KERNEL */ |
| |
| #endif /* _LINUX_POLL_H */ |