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TOMOYO Linux Cross Reference
Linux/include/linux/eventpoll.h

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  1 /*
  2  *  include/linux/eventpoll.h ( Efficient event polling implementation )
  3  *  Copyright (C) 2001,...,2006  Davide Libenzi
  4  *
  5  *  This program is free software; you can redistribute it and/or modify
  6  *  it under the terms of the GNU General Public License as published by
  7  *  the Free Software Foundation; either version 2 of the License, or
  8  *  (at your option) any later version.
  9  *
 10  *  Davide Libenzi <davidel@xmailserver.org>
 11  *
 12  */
 13 #ifndef _LINUX_EVENTPOLL_H
 14 #define _LINUX_EVENTPOLL_H
 15 
 16 #include <uapi/linux/eventpoll.h>
 17 #include <uapi/linux/kcmp.h>
 18 
 19 
 20 /* Forward declarations to avoid compiler errors */
 21 struct file;
 22 
 23 
 24 #ifdef CONFIG_EPOLL
 25 
 26 #ifdef CONFIG_CHECKPOINT_RESTORE
 27 struct file *get_epoll_tfile_raw_ptr(struct file *file, int tfd, unsigned long toff);
 28 #endif
 29 
 30 /* Used to initialize the epoll bits inside the "struct file" */
 31 static inline void eventpoll_init_file(struct file *file)
 32 {
 33         INIT_LIST_HEAD(&file->f_ep_links);
 34         INIT_LIST_HEAD(&file->f_tfile_llink);
 35 }
 36 
 37 
 38 /* Used to release the epoll bits inside the "struct file" */
 39 void eventpoll_release_file(struct file *file);
 40 
 41 /*
 42  * This is called from inside fs/file_table.c:__fput() to unlink files
 43  * from the eventpoll interface. We need to have this facility to cleanup
 44  * correctly files that are closed without being removed from the eventpoll
 45  * interface.
 46  */
 47 static inline void eventpoll_release(struct file *file)
 48 {
 49 
 50         /*
 51          * Fast check to avoid the get/release of the semaphore. Since
 52          * we're doing this outside the semaphore lock, it might return
 53          * false negatives, but we don't care. It'll help in 99.99% of cases
 54          * to avoid the semaphore lock. False positives simply cannot happen
 55          * because the file in on the way to be removed and nobody ( but
 56          * eventpoll ) has still a reference to this file.
 57          */
 58         if (likely(list_empty(&file->f_ep_links)))
 59                 return;
 60 
 61         /*
 62          * The file is being closed while it is still linked to an epoll
 63          * descriptor. We need to handle this by correctly unlinking it
 64          * from its containers.
 65          */
 66         eventpoll_release_file(file);
 67 }
 68 
 69 #else
 70 
 71 static inline void eventpoll_init_file(struct file *file) {}
 72 static inline void eventpoll_release(struct file *file) {}
 73 
 74 #endif
 75 
 76 #endif /* #ifndef _LINUX_EVENTPOLL_H */
 77 

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