LCOV - code coverage report
Current view: top level - include/linux - poll.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 1 1 100.0 %
Date: 2017-01-25 Functions: 0 0 -

          Line data    Source code
       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/ktime.h>
      10             : #include <linux/wait.h>
      11             : #include <linux/string.h>
      12             : #include <linux/fs.h>
      13             : #include <asm/uaccess.h>
      14             : 
      15             : /* ~832 bytes of stack space used max in sys_select/sys_poll before allocating
      16             :    additional memory. */
      17             : #define MAX_STACK_ALLOC 832
      18             : #define FRONTEND_STACK_ALLOC    256
      19             : #define SELECT_STACK_ALLOC      FRONTEND_STACK_ALLOC
      20             : #define POLL_STACK_ALLOC        FRONTEND_STACK_ALLOC
      21             : #define WQUEUES_STACK_ALLOC     (MAX_STACK_ALLOC - FRONTEND_STACK_ALLOC)
      22             : #define N_INLINE_POLL_ENTRIES   (WQUEUES_STACK_ALLOC / sizeof(struct poll_table_entry))
      23             : 
      24             : #define DEFAULT_POLLMASK (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)
      25             : 
      26             : struct poll_table_struct;
      27             : 
      28             : /* 
      29             :  * structures and helpers for f_op->poll implementations
      30             :  */
      31             : typedef void (*poll_queue_proc)(struct file *, wait_queue_head_t *, struct poll_table_struct *);
      32           1 : 
      33             : typedef struct poll_table_struct {
      34             :         poll_queue_proc qproc;
      35             :         unsigned long key;
      36             : } poll_table;
      37             : 
      38             : static inline void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p)
      39             : {
      40             :         if (p && wait_address)
      41             :                 p->qproc(filp, wait_address, p);
      42             : }
      43             : 
      44             : static inline void init_poll_funcptr(poll_table *pt, poll_queue_proc qproc)
      45             : {
      46             :         pt->qproc = qproc;
      47             :         pt->key   = ~0UL; /* all events enabled */
      48             : }
      49             : 
      50             : struct poll_table_entry {
      51             :         struct file *filp;
      52             :         unsigned long key;
      53             :         wait_queue_t wait;
      54             :         wait_queue_head_t *wait_address;
      55             : };
      56             : 
      57             : /*
      58             :  * Structures and helpers for sys_poll/sys_poll
      59             :  */
      60             : struct poll_wqueues {
      61             :         poll_table pt;
      62             :         struct poll_table_page *table;
      63             :         struct task_struct *polling_task;
      64             :         int triggered;
      65             :         int error;
      66             :         int inline_index;
      67             :         struct poll_table_entry inline_entries[N_INLINE_POLL_ENTRIES];
      68             : };
      69             : 
      70             : extern void poll_initwait(struct poll_wqueues *pwq);
      71             : extern void poll_freewait(struct poll_wqueues *pwq);
      72             : extern int poll_schedule_timeout(struct poll_wqueues *pwq, int state,
      73             :                                  ktime_t *expires, unsigned long slack);
      74             : 
      75             : static inline int poll_schedule(struct poll_wqueues *pwq, int state)
      76             : {
      77             :         return poll_schedule_timeout(pwq, state, NULL, 0);
      78             : }
      79             : 
      80             : /*
      81             :  * Scaleable version of the fd_set.
      82             :  */
      83             : 
      84             : typedef struct {
      85             :         unsigned long *in, *out, *ex;
      86             :         unsigned long *res_in, *res_out, *res_ex;
      87             : } fd_set_bits;
      88             : 
      89             : /*
      90             :  * How many longwords for "nr" bits?
      91             :  */
      92             : #define FDS_BITPERLONG  (8*sizeof(long))
      93             : #define FDS_LONGS(nr)   (((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG)
      94             : #define FDS_BYTES(nr)   (FDS_LONGS(nr)*sizeof(long))
      95             : 
      96             : /*
      97             :  * We do a VERIFY_WRITE here even though we are only reading this time:
      98             :  * we'll write to it eventually..
      99             :  *
     100             :  * Use "unsigned long" accesses to let user-mode fd_set's be long-aligned.
     101             :  */
     102             : static inline
     103             : int get_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset)
     104             : {
     105             :         nr = FDS_BYTES(nr);
     106             :         if (ufdset)
     107             :                 return copy_from_user(fdset, ufdset, nr) ? -EFAULT : 0;
     108             : 
     109             :         memset(fdset, 0, nr);
     110             :         return 0;
     111             : }
     112             : 
     113             : static inline unsigned long __must_check
     114             : set_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset)
     115             : {
     116             :         if (ufdset)
     117             :                 return __copy_to_user(ufdset, fdset, FDS_BYTES(nr));
     118             :         return 0;
     119             : }
     120             : 
     121             : static inline
     122             : void zero_fd_set(unsigned long nr, unsigned long *fdset)
     123             : {
     124             :         memset(fdset, 0, FDS_BYTES(nr));
     125             : }
     126             : 
     127             : #define MAX_INT64_SECONDS (((s64)(~((u64)0)>>1)/HZ)-1)
     128             : 
     129             : extern int do_select(int n, fd_set_bits *fds, struct timespec *end_time);
     130             : extern int do_sys_poll(struct pollfd __user * ufds, unsigned int nfds,
     131             :                        struct timespec *end_time);
     132             : extern int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
     133             :                            fd_set __user *exp, struct timespec *end_time);
     134             : 
     135             : extern int poll_select_set_timeout(struct timespec *to, long sec, long nsec);
     136             : 
     137             : #endif /* KERNEL */
     138             : 
     139             : #endif /* _LINUX_POLL_H */

Generated by: LCOV version 1.10