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  1. /* Compatibility definitions for System V `poll' interface.
  2.    Copyright (C) 1994,1996-2001,2004,2005,2006 Free Software Foundation, Inc.
  3.    This file is part of the GNU C Library.
  4.  
  5.    The GNU C Library is free software; you can redistribute it and/or
  6.    modify it under the terms of the GNU Lesser General Public
  7.    License as published by the Free Software Foundation; either
  8.    version 2.1 of the License, or (at your option) any later version.
  9.  
  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.