LCOV - code coverage report
Current view: top level - include/uapi/linux - eventpoll.h (source / functions) Hit Total Coverage
Test: combined.info Lines: 3 4 75.0 %
Date: 2022-04-01 13:59:58 Functions: 1 1 100.0 %
Branches: 1 4 25.0 %

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
       2                 :            : /*
       3                 :            :  *  include/linux/eventpoll.h ( Efficient event polling implementation )
       4                 :            :  *  Copyright (C) 2001,...,2006  Davide Libenzi
       5                 :            :  *
       6                 :            :  *  This program is free software; you can redistribute it and/or modify
       7                 :            :  *  it under the terms of the GNU General Public License as published by
       8                 :            :  *  the Free Software Foundation; either version 2 of the License, or
       9                 :            :  *  (at your option) any later version.
      10                 :            :  *
      11                 :            :  *  Davide Libenzi <davidel@xmailserver.org>
      12                 :            :  *
      13                 :            :  */
      14                 :            : 
      15                 :            : #ifndef _UAPI_LINUX_EVENTPOLL_H
      16                 :            : #define _UAPI_LINUX_EVENTPOLL_H
      17                 :            : 
      18                 :            : /* For O_CLOEXEC */
      19                 :            : #include <linux/fcntl.h>
      20                 :            : #include <linux/types.h>
      21                 :            : 
      22                 :            : /* Flags for epoll_create1.  */
      23                 :            : #define EPOLL_CLOEXEC O_CLOEXEC
      24                 :            : 
      25                 :            : /* Valid opcodes to issue to sys_epoll_ctl() */
      26                 :            : #define EPOLL_CTL_ADD 1
      27                 :            : #define EPOLL_CTL_DEL 2
      28                 :            : #define EPOLL_CTL_MOD 3
      29                 :            : 
      30                 :            : /* Epoll event masks */
      31                 :            : #define EPOLLIN         (__force __poll_t)0x00000001
      32                 :            : #define EPOLLPRI        (__force __poll_t)0x00000002
      33                 :            : #define EPOLLOUT        (__force __poll_t)0x00000004
      34                 :            : #define EPOLLERR        (__force __poll_t)0x00000008
      35                 :            : #define EPOLLHUP        (__force __poll_t)0x00000010
      36                 :            : #define EPOLLNVAL       (__force __poll_t)0x00000020
      37                 :            : #define EPOLLRDNORM     (__force __poll_t)0x00000040
      38                 :            : #define EPOLLRDBAND     (__force __poll_t)0x00000080
      39                 :            : #define EPOLLWRNORM     (__force __poll_t)0x00000100
      40                 :            : #define EPOLLWRBAND     (__force __poll_t)0x00000200
      41                 :            : #define EPOLLMSG        (__force __poll_t)0x00000400
      42                 :            : #define EPOLLRDHUP      (__force __poll_t)0x00002000
      43                 :            : 
      44                 :            : /* Set exclusive wakeup mode for the target file descriptor */
      45                 :            : #define EPOLLEXCLUSIVE  ((__force __poll_t)(1U << 28))
      46                 :            : 
      47                 :            : /*
      48                 :            :  * Request the handling of system wakeup events so as to prevent system suspends
      49                 :            :  * from happening while those events are being processed.
      50                 :            :  *
      51                 :            :  * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be
      52                 :            :  * re-allowed until epoll_wait is called again after consuming the wakeup
      53                 :            :  * event(s).
      54                 :            :  *
      55                 :            :  * Requires CAP_BLOCK_SUSPEND
      56                 :            :  */
      57                 :            : #define EPOLLWAKEUP     ((__force __poll_t)(1U << 29))
      58                 :            : 
      59                 :            : /* Set the One Shot behaviour for the target file descriptor */
      60                 :            : #define EPOLLONESHOT    ((__force __poll_t)(1U << 30))
      61                 :            : 
      62                 :            : /* Set the Edge Triggered behaviour for the target file descriptor */
      63                 :            : #define EPOLLET         ((__force __poll_t)(1U << 31))
      64                 :            : 
      65                 :            : /* 
      66                 :            :  * On x86-64 make the 64bit structure have the same alignment as the
      67                 :            :  * 32bit structure. This makes 32bit emulation easier.
      68                 :            :  *
      69                 :            :  * UML/x86_64 needs the same packing as x86_64
      70                 :            :  */
      71                 :            : #ifdef __x86_64__
      72                 :            : #define EPOLL_PACKED __attribute__((packed))
      73                 :            : #else
      74                 :            : #define EPOLL_PACKED
      75                 :            : #endif
      76                 :            : 
      77                 :            : struct epoll_event {
      78                 :            :         __poll_t events;
      79                 :            :         __u64 data;
      80                 :            : } EPOLL_PACKED;
      81                 :            : 
      82                 :            : #ifdef CONFIG_PM_SLEEP
      83                 :      16086 : static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
      84                 :            : {
      85   [ -  +  -  - ]:      16086 :         if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND))
      86                 :          0 :                 epev->events &= ~EPOLLWAKEUP;
      87                 :      16086 : }
      88                 :            : #else
      89                 :            : static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
      90                 :            : {
      91                 :            :         epev->events &= ~EPOLLWAKEUP;
      92                 :            : }
      93                 :            : #endif
      94                 :            : #endif /* _UAPI_LINUX_EVENTPOLL_H */

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