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