sysdeps/unix/sysv/linux/sys/epoll.h

   1 /* Copyright (C) 2002-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _SYS_EPOLL_H
  19 #define _SYS_EPOLL_H    1
  20
  21 #include <stdint.h>
  22 #include <sys/types.h>
  23
  24 /* Get __sigset_t.  */
  25 #include <bits/sigset.h>
  26
  27 #ifndef __sigset_t_defined
  28 # define __sigset_t_defined
  29 typedef __sigset_t sigset_t;
  30 #endif
  31
  32 /* Get the platform-dependent flags.  */
  33 #include <bits/epoll.h>
  34
  35 #ifndef __EPOLL_PACKED
  36 # define __EPOLL_PACKED
  37 #endif
  38
  39
  40 enum EPOLL_EVENTS
  41   {
  42     EPOLLIN = 0x001,
  43 #define EPOLLIN EPOLLIN
  44     EPOLLPRI = 0x002,
  45 #define EPOLLPRI EPOLLPRI
  46     EPOLLOUT = 0x004,
  47 #define EPOLLOUT EPOLLOUT
  48     EPOLLRDNORM = 0x040,
  49 #define EPOLLRDNORM EPOLLRDNORM
  50     EPOLLRDBAND = 0x080,
  51 #define EPOLLRDBAND EPOLLRDBAND
  52     EPOLLWRNORM = 0x100,
  53 #define EPOLLWRNORM EPOLLWRNORM
  54     EPOLLWRBAND = 0x200,
  55 #define EPOLLWRBAND EPOLLWRBAND
  56     EPOLLMSG = 0x400,
  57 #define EPOLLMSG EPOLLMSG
  58     EPOLLERR = 0x008,
  59 #define EPOLLERR EPOLLERR
  60     EPOLLHUP = 0x010,
  61 #define EPOLLHUP EPOLLHUP
  62     EPOLLRDHUP = 0x2000,
  63 #define EPOLLRDHUP EPOLLRDHUP
  64     EPOLLWAKEUP = 1u << 29,
  65 #define EPOLLWAKEUP EPOLLWAKEUP
  66     EPOLLONESHOT = 1u << 30,
  67 #define EPOLLONESHOT EPOLLONESHOT
  68     EPOLLET = 1u << 31
  69 #define EPOLLET EPOLLET
  70   };
  71
  72
  73 /* Valid opcodes ( "op" parameter ) to issue to epoll_ctl().  */
  74 #define EPOLL_CTL_ADD 1 /* Add a file descriptor to the interface.  */
  75 #define EPOLL_CTL_DEL 2 /* Remove a file descriptor from the interface.  */
  76 #define EPOLL_CTL_MOD 3 /* Change file descriptor epoll_event structure.  */
  77
  78
  79 typedef union epoll_data
  80 {
  81   void *ptr;
  82   int fd;
  83   uint32_t u32;
  84   uint64_t u64;
  85 } epoll_data_t;
  86
  87 struct epoll_event
  88 {
  89   uint32_t events;      /* Epoll events */
  90   epoll_data_t data;    /* User data variable */
  91 } __EPOLL_PACKED;
  92
  93
  94 __BEGIN_DECLS
  95
  96 /* Creates an epoll instance.  Returns an fd for the new instance.
  97    The "size" parameter is a hint specifying the number of file
  98    descriptors to be associated with the new instance.  The fd
  99    returned by epoll_create() should be closed with close().  */
 100 extern int epoll_create (int __size) __THROW;
 101
 102 /* Same as epoll_create but with an FLAGS parameter.  The unused SIZE
 103    parameter has been dropped.  */
 104 extern int epoll_create1 (int __flags) __THROW;
 105
 106
 107 /* Manipulate an epoll instance "epfd". Returns 0 in case of success,
 108    -1 in case of error ( the "errno" variable will contain the
 109    specific error code ) The "op" parameter is one of the EPOLL_CTL_*
 110    constants defined above. The "fd" parameter is the target of the
 111    operation. The "event" parameter describes which events the caller
 112    is interested in and any associated user data.  */
 113 extern int epoll_ctl (int __epfd, int __op, int __fd,
 114                       struct epoll_event *__event) __THROW;
 115
 116
 117 /* Wait for events on an epoll instance "epfd". Returns the number of
 118    triggered events returned in "events" buffer. Or -1 in case of
 119    error with the "errno" variable set to the specific error code. The
 120    "events" parameter is a buffer that will contain triggered
 121    events. The "maxevents" is the maximum number of events to be
 122    returned ( usually size of "events" ). The "timeout" parameter
 123    specifies the maximum wait time in milliseconds (-1 == infinite).
 124
 125    This function is a cancellation point and therefore not marked with
 126    __THROW.  */
 127 extern int epoll_wait (int __epfd, struct epoll_event *__events,
 128                        int __maxevents, int __timeout);
 129
 130
 131 /* Same as epoll_wait, but the thread's signal mask is temporarily
 132    and atomically replaced with the one provided as parameter.
 133
 134    This function is a cancellation point and therefore not marked with
 135    __THROW.  */
 136 extern int epoll_pwait (int __epfd, struct epoll_event *__events,
 137                         int __maxevents, int __timeout,
 138                         const __sigset_t *__ss);
 139
 140 __END_DECLS
 141
 142 #endif /* sys/epoll.h */