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 */ 100