1c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef _LINUX_POLL_H 2c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define _LINUX_POLL_H 3c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 4c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <asm/poll.h> 5c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 6c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef __KERNEL__ 7c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 8c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/compiler.h> 9c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/wait.h> 10c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/string.h> 11c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/mm.h> 12c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <asm/uaccess.h> 13c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 14c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* ~832 bytes of stack space used max in sys_select/sys_poll before allocating 15c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru additional memory. */ 16c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAX_STACK_ALLOC 832 17c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FRONTEND_STACK_ALLOC 256 18c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SELECT_STACK_ALLOC FRONTEND_STACK_ALLOC 19c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define POLL_STACK_ALLOC FRONTEND_STACK_ALLOC 20c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define WQUEUES_STACK_ALLOC (MAX_STACK_ALLOC - FRONTEND_STACK_ALLOC) 21c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define N_INLINE_POLL_ENTRIES (WQUEUES_STACK_ALLOC / sizeof(struct poll_table_entry)) 22c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 23c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct poll_table_struct; 24c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 25c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 26c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * structures and helpers for f_op->poll implementations 27c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 28c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef void (*poll_queue_proc)(struct file *, wait_queue_head_t *, struct poll_table_struct *); 29c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 30c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef struct poll_table_struct { 31c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru poll_queue_proc qproc; 32c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} poll_table; 33c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 34c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p) 35c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 36c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (p && wait_address) 37c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru p->qproc(filp, wait_address, p); 38c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 39c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 40c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void init_poll_funcptr(poll_table *pt, poll_queue_proc qproc) 41c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 42c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru pt->qproc = qproc; 43c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 44c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 45c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct poll_table_entry { 46c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file * filp; 47c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru wait_queue_t wait; 48c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru wait_queue_head_t * wait_address; 49c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 50c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 51c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 52c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Structures and helpers for sys_poll/sys_poll 53c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 54c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct poll_wqueues { 55c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru poll_table pt; 56c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct poll_table_page * table; 57c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int error; 58c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int inline_index; 59c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct poll_table_entry inline_entries[N_INLINE_POLL_ENTRIES]; 60c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 61c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 62c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void poll_initwait(struct poll_wqueues *pwq); 63c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void poll_freewait(struct poll_wqueues *pwq); 64c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 65c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 66c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Scaleable version of the fd_set. 67c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 68c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 69c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef struct { 70c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long *in, *out, *ex; 71c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long *res_in, *res_out, *res_ex; 72c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} fd_set_bits; 73c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 74c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 75c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * How many longwords for "nr" bits? 76c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 77c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FDS_BITPERLONG (8*sizeof(long)) 78c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FDS_LONGS(nr) (((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG) 79c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FDS_BYTES(nr) (FDS_LONGS(nr)*sizeof(long)) 80c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 81c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 82c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * We do a VERIFY_WRITE here even though we are only reading this time: 83c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * we'll write to it eventually.. 84c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 85c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Use "unsigned long" accesses to let user-mode fd_set's be long-aligned. 86c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 87c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline 88c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint get_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) 89c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 90c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru nr = FDS_BYTES(nr); 91c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (ufdset) 92c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return copy_from_user(fdset, ufdset, nr) ? -EFAULT : 0; 93c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 94c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru memset(fdset, 0, nr); 95c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return 0; 96c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 97c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 98c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline unsigned long __must_check 99c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruset_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) 100c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 101c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (ufdset) 102c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return __copy_to_user(ufdset, fdset, FDS_BYTES(nr)); 103c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return 0; 104c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 105c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 106c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline 107c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid zero_fd_set(unsigned long nr, unsigned long *fdset) 108c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 109c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru memset(fdset, 0, FDS_BYTES(nr)); 110c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 111c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 112c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAX_INT64_SECONDS (((s64)(~((u64)0)>>1)/HZ)-1) 113c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 114c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int do_select(int n, fd_set_bits *fds, s64 *timeout); 115c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int do_sys_poll(struct pollfd __user * ufds, unsigned int nfds, 116c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru s64 *timeout); 117c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 118c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* KERNEL */ 119c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 120c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* _LINUX_POLL_H */ 121