text: /* Copyright (C) 2002-2021 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, see
     <https://www.gnu.org/licenses/>.  */
  
  #ifndef	_SYS_EPOLL_H
  #define	_SYS_EPOLL_H	1
  
  #include <stdint.h>
  #include <sys/types.h>
  
  #include <bits/types/sigset_t.h>
  
  /* Get the platform-dependent flags.  */
  #include <bits/epoll.h>
  
  #ifndef __EPOLL_PACKED
  # define __EPOLL_PACKED
  #endif
  
  
  enum EPOLL_EVENTS
    {
      EPOLLIN = 0x001,
  #define EPOLLIN EPOLLIN
      EPOLLPRI = 0x002,
  #define EPOLLPRI EPOLLPRI
      EPOLLOUT = 0x004,
  #define EPOLLOUT EPOLLOUT
      EPOLLRDNORM = 0x040,
  #define EPOLLRDNORM EPOLLRDNORM
      EPOLLRDBAND = 0x080,
  #define EPOLLRDBAND EPOLLRDBAND
      EPOLLWRNORM = 0x100,
  #define EPOLLWRNORM EPOLLWRNORM
      EPOLLWRBAND = 0x200,
  #define EPOLLWRBAND EPOLLWRBAND
      EPOLLMSG = 0x400,
  #define EPOLLMSG EPOLLMSG
      EPOLLERR = 0x008,
  #define EPOLLERR EPOLLERR
      EPOLLHUP = 0x010,
  #define EPOLLHUP EPOLLHUP
      EPOLLRDHUP = 0x2000,
  #define EPOLLRDHUP EPOLLRDHUP
      EPOLLEXCLUSIVE = 1u << 28,
  #define EPOLLEXCLUSIVE EPOLLEXCLUSIVE
      EPOLLWAKEUP = 1u << 29,
  #define EPOLLWAKEUP EPOLLWAKEUP
      EPOLLONESHOT = 1u << 30,
  #define EPOLLONESHOT EPOLLONESHOT
      EPOLLET = 1u << 31
  #define EPOLLET EPOLLET
    };
  
  
  /* Valid opcodes ( "op" parameter ) to issue to epoll_ctl().  */
  #define EPOLL_CTL_ADD 1	/* Add a file descriptor to the interface.  */
  #define EPOLL_CTL_DEL 2	/* Remove a file descriptor from the interface.  */
  #define EPOLL_CTL_MOD 3	/* Change file descriptor epoll_event structure.  */
  
  
  typedef union epoll_data
  {
    void *ptr;
    int fd;
    uint32_t u32;
    uint64_t u64;
  } epoll_data_t;
  
  struct epoll_event
  {
    uint32_t events;	/* Epoll events */
    epoll_data_t data;	/* User data variable */
  } __EPOLL_PACKED;
  
  
  __BEGIN_DECLS
  
  /* Creates an epoll instance.  Returns an fd for the new instance.
     The "size" parameter is a hint specifying the number of file
     descriptors to be associated with the new instance.  The fd
     returned by epoll_create() should be closed with close().  */
  extern int epoll_create (int __size) __THROW;
  
  /* Same as epoll_create but with an FLAGS parameter.  The unused SIZE
     parameter has been dropped.  */
  extern int epoll_create1 (int __flags) __THROW;
  
  
  /* Manipulate an epoll instance "epfd". Returns 0 in case of success,
     -1 in case of error ( the "errno" variable will contain the
     specific error code ) The "op" parameter is one of the EPOLL_CTL_*
     constants defined above. The "fd" parameter is the target of the
     operation. The "event" parameter describes which events the caller
     is interested in and any associated user data.  */
  extern int epoll_ctl (int __epfd, int __op, int __fd,
  		      struct epoll_event *__event) __THROW;
  
  
  /* Wait for events on an epoll instance "epfd". Returns the number of
     triggered events returned in "events" buffer. Or -1 in case of
     error with the "errno" variable set to the specific error code. The
     "events" parameter is a buffer that will contain triggered
     events. The "maxevents" is the maximum number of events to be
     returned ( usually size of "events" ). The "timeout" parameter
     specifies the maximum wait time in milliseconds (-1 == infinite).
  
     This function is a cancellation point and therefore not marked with
     __THROW.  */
  extern int epoll_wait (int __epfd, struct epoll_event *__events,
  		       int __maxevents, int __timeout);
  
  
  /* Same as epoll_wait, but the thread's signal mask is temporarily
     and atomically replaced with the one provided as parameter.
  
     This function is a cancellation point and therefore not marked with
     __THROW.  */
  extern int epoll_pwait (int __epfd, struct epoll_event *__events,
  			int __maxevents, int __timeout,
  			const __sigset_t *__ss);
  
  __END_DECLS
  
  #endif /* sys/epoll.h */