cregit-Linux how code gets into the kernel

Release 4.15 include/linux/eventpoll.h

Directory: include/linux
/*
 *  include/linux/eventpoll.h ( Efficient event polling implementation )
 *  Copyright (C) 2001,...,2006  Davide Libenzi
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  Davide Libenzi <davidel@xmailserver.org>
 *
 */
#ifndef _LINUX_EVENTPOLL_H

#define _LINUX_EVENTPOLL_H

#include <uapi/linux/eventpoll.h>
#include <uapi/linux/kcmp.h>


/* Forward declarations to avoid compiler errors */
struct file;


#ifdef CONFIG_EPOLL

#ifdef CONFIG_CHECKPOINT_RESTORE
struct file *get_epoll_tfile_raw_ptr(struct file *file, int tfd, unsigned long toff);
#endif

/* Used to initialize the epoll bits inside the "struct file" */

static inline void eventpoll_init_file(struct file *file) { INIT_LIST_HEAD(&file->f_ep_links); INIT_LIST_HEAD(&file->f_tfile_llink); }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin LaHaise1242.86%125.00%
Davide Libenzi828.57%250.00%
Jason Baron828.57%125.00%
Total28100.00%4100.00%

/* Used to release the epoll bits inside the "struct file" */ void eventpoll_release_file(struct file *file); /* * This is called from inside fs/file_table.c:__fput() to unlink files * from the eventpoll interface. We need to have this facility to cleanup * correctly files that are closed without being removed from the eventpoll * interface. */
static inline void eventpoll_release(struct file *file) { /* * Fast check to avoid the get/release of the semaphore. Since * we're doing this outside the semaphore lock, it might return * false negatives, but we don't care. It'll help in 99.99% of cases * to avoid the semaphore lock. False positives simply cannot happen * because the file in on the way to be removed and nobody ( but * eventpoll ) has still a reference to this file. */ if (likely(list_empty(&file->f_ep_links))) return; /* * The file is being closed while it is still linked to an epoll * descriptor. We need to handle this by correctly unlinking it * from its containers. */ eventpoll_release_file(file); }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton33100.00%1100.00%
Total33100.00%1100.00%

#else
static inline void eventpoll_init_file(struct file *file) {}

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton11100.00%1100.00%
Total11100.00%1100.00%


static inline void eventpoll_release(struct file *file) {}

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton11100.00%1100.00%
Total11100.00%1100.00%

#endif #endif /* #ifndef _LINUX_EVENTPOLL_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton6746.21%215.38%
Davide Libenzi3020.69%538.46%
Cyrill V. Gorcunov2617.93%215.38%
Benjamin LaHaise128.28%17.69%
Jason Baron85.52%17.69%
David Howells10.69%17.69%
Lucas De Marchi10.69%17.69%
Total145100.00%13100.00%
Directory: include/linux
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