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001: /* Copyright (C) 2002-2008, 2010, 2011 Free Software Foundation, Inc.
002:    This file is part of the GNU C Library.
003: 
004:    The GNU C Library is free software; you can redistribute it and/or
005:    modify it under the terms of the GNU Lesser General Public
006:    License as published by the Free Software Foundation; either
007:    version 2.1 of the License, or (at your option) any later version.
008: 
009:    The GNU C Library is distributed in the hope that it will be useful,
010:    but WITHOUT ANY WARRANTY; without even the implied warranty of
011:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
012:    Lesser General Public License for more details.
013: 
014:    You should have received a copy of the GNU Lesser General Public
015:    License along with the GNU C Library; if not, write to the Free
016:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
017:    02111-1307 USA.  */
018: 
019: #ifndef _SYS_EPOLL_H
020: #define _SYS_EPOLL_H    1
021: 
022: #include <stdint.h>
023: #include <sys/types.h>
024: 
025: /* Get __sigset_t.  */
026: #include <bits/sigset.h>
027: 
028: #ifndef __sigset_t_defined
029: # define __sigset_t_defined
030: typedef __sigset_t sigset_t;
031: #endif
032: 
033: 
034: /* Flags to be passed to epoll_create1.  */
035: enum
036:   {
037:     EPOLL_CLOEXEC = 02000000,
038: #define EPOLL_CLOEXEC EPOLL_CLOEXEC
039:     EPOLL_NONBLOCK = 04000
040: #define EPOLL_NONBLOCK EPOLL_NONBLOCK
041:   };
042: 
043: 
044: enum EPOLL_EVENTS
045:   {
046:     EPOLLIN = 0x001,
047: #define EPOLLIN EPOLLIN
048:     EPOLLPRI = 0x002,
049: #define EPOLLPRI EPOLLPRI
050:     EPOLLOUT = 0x004,
051: #define EPOLLOUT EPOLLOUT
052:     EPOLLRDNORM = 0x040,
053: #define EPOLLRDNORM EPOLLRDNORM
054:     EPOLLRDBAND = 0x080,
055: #define EPOLLRDBAND EPOLLRDBAND
056:     EPOLLWRNORM = 0x100,
057: #define EPOLLWRNORM EPOLLWRNORM
058:     EPOLLWRBAND = 0x200,
059: #define EPOLLWRBAND EPOLLWRBAND
060:     EPOLLMSG = 0x400,
061: #define EPOLLMSG EPOLLMSG
062:     EPOLLERR = 0x008,
063: #define EPOLLERR EPOLLERR
064:     EPOLLHUP = 0x010,
065: #define EPOLLHUP EPOLLHUP
066:     EPOLLRDHUP = 0x2000,
067: #define EPOLLRDHUP EPOLLRDHUP
068:     EPOLLONESHOT = 1u << 30,
069: #define EPOLLONESHOT EPOLLONESHOT
070:     EPOLLET = 1u << 31
071: #define EPOLLET EPOLLET
072:   };
073: 
074: 
075: /* Valid opcodes ( "op" parameter ) to issue to epoll_ctl().  */
076: #define EPOLL_CTL_ADD 1 /* Add a file decriptor to the interface.  */
077: #define EPOLL_CTL_DEL 2 /* Remove a file decriptor from the interface.  */
078: #define EPOLL_CTL_MOD 3 /* Change file decriptor epoll_event structure.  */
079: 
080: 
081: typedef union epoll_data
082: {
083:   void *ptr;
084:   int fd;
085:   uint32_t u32;
086:   uint64_t u64;
087: } epoll_data_t;
088: 
089: struct epoll_event
090: {
091:   uint32_t events;      /* Epoll events */
092:   epoll_data_t data;    /* User data variable */
093: } __attribute__ ((__packed__));
094: 
095: 
096: __BEGIN_DECLS
097: 
098: /* Creates an epoll instance.  Returns an fd for the new instance.
099:    The "size" parameter is a hint specifying the number of file
100:    descriptors to be associated with the new instance.  The fd
101:    returned by epoll_create() should be closed with close().  */
102: extern int epoll_create (int __size) __THROW;
103: 
104: /* Same as epoll_create but with an FLAGS parameter.  The unused SIZE
105:    parameter has been dropped.  */
106: extern int epoll_create1 (int __flags) __THROW;
107: 
108: 
109: /* Manipulate an epoll instance "epfd". Returns 0 in case of success,
110:    -1 in case of error ( the "errno" variable will contain the
111:    specific error code ) The "op" parameter is one of the EPOLL_CTL_*
112:    constants defined above. The "fd" parameter is the target of the
113:    operation. The "event" parameter describes which events the caller
114:    is interested in and any associated user data.  */
115: extern int epoll_ctl (int __epfd, int __op, int __fd,
116:                       struct epoll_event *__event) __THROW;
117: 
118: 
119: /* Wait for events on an epoll instance "epfd". Returns the number of
120:    triggered events returned in "events" buffer. Or -1 in case of
121:    error with the "errno" variable set to the specific error code. The
122:    "events" parameter is a buffer that will contain triggered
123:    events. The "maxevents" is the maximum number of events to be
124:    returned ( usually size of "events" ). The "timeout" parameter
125:    specifies the maximum wait time in milliseconds (-1 == infinite).
126: 
127:    This function is a cancellation point and therefore not marked with
128:    __THROW.  */
129: extern int epoll_wait (int __epfd, struct epoll_event *__events,
130:                        int __maxevents, int __timeout);
131: 
132: 
133: /* Same as epoll_wait, but the thread's signal mask is temporarily
134:    and atomically replaced with the one provided as parameter.
135: 
136:    This function is a cancellation point and therefore not marked with
137:    __THROW.  */
138: extern int epoll_pwait (int __epfd, struct epoll_event *__events,
139:                         int __maxevents, int __timeout,
140:                         __const __sigset_t *__ss);
141: 
142: __END_DECLS
143: 
144: #endif /* sys/epoll.h */
145: 

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