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01: /* Compatibility definitions for System V `poll' interface.
02:    Copyright (C) 1994,1996-2001,2004,2005,2006 Free Software Foundation, Inc.
03:    This file is part of the GNU C Library.
04: 
05:    The GNU C Library is free software; you can redistribute it and/or
06:    modify it under the terms of the GNU Lesser General Public
07:    License as published by the Free Software Foundation; either
08:    version 2.1 of the License, or (at your option) any later version.
09: 
10:    The GNU C Library is distributed in the hope that it will be useful,
11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13:    Lesser General Public License for more details.
14: 
15:    You should have received a copy of the GNU Lesser General Public
16:    License along with the GNU C Library; if not, write to the Free
17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18:    02111-1307 USA.  */
19: 
20: #ifndef _SYS_POLL_H
21: #define _SYS_POLL_H     1
22: 
23: #include <features.h>
24: 
25: /* Get the platform dependent bits of `poll'.  */
26: #include <bits/poll.h>
27: #ifdef __USE_GNU
28: /* Get the __sigset_t definition.  */
29: # include <bits/sigset.h>
30: /* Get the timespec definition.  */
31: # define __need_timespec
32: # include <time.h>
33: #endif
34: 
35: 
36: /* Type used for the number of file descriptors.  */
37: typedef unsigned long int nfds_t;
38: 
39: /* Data structure describing a polling request.  */
40: struct pollfd
41:   {
42:     int fd;                     /* File descriptor to poll.  */
43:     short int events;           /* Types of events poller cares about.  */
44:     short int revents;          /* Types of events that actually occurred.  */
45:   };
46: 
47: 
48: __BEGIN_DECLS
49: 
50: /* Poll the file descriptors described by the NFDS structures starting at
51:    FDS.  If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
52:    an event to occur; if TIMEOUT is -1, block until an event occurs.
53:    Returns the number of file descriptors with events, zero if timed out,
54:    or -1 for errors.
55: 
56:    This function is a cancellation point and therefore not marked with
57:    __THROW.  */
58: extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout);
59: 
60: #ifdef __USE_GNU
61: /* Like poll, but before waiting the threads signal mask is replaced
62:    with that specified in the fourth parameter.  For better usability,
63:    the timeout value is specified using a TIMESPEC object.
64: 
65:    This function is a cancellation point and therefore not marked with
66:    __THROW.  */
67: extern int ppoll (struct pollfd *__fds, nfds_t __nfds,
68:                   __const struct timespec *__timeout,
69:                   __const __sigset_t *__ss);
70: #endif
71: 
72: __END_DECLS
73: 
74: #endif  /* sys/poll.h */
75: 

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