Andrew's git - gitweb.git/blob - compat/poll/poll.h

   1/* Header for poll(2) emulation
   2   Contributed by Paolo Bonzini.
   3
   4   Copyright 2001, 2002, 2003, 2007, 2009, 2010 Free Software Foundation, Inc.
   5
   6   This file is part of gnulib.
   7
   8   This program is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2, or (at your option)
  11   any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License along
  19   with this program; if not, see <http://www.gnu.org/licenses/>.  */
  20
  21#ifndef _GL_POLL_H
  22#define _GL_POLL_H
  23
  24#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x600
  25/* Vista has its own, socket-only poll() */
  26#undef POLLIN
  27#undef POLLPRI
  28#undef POLLOUT
  29#undef POLLERR
  30#undef POLLHUP
  31#undef POLLNVAL
  32#undef POLLRDNORM
  33#undef POLLRDBAND
  34#undef POLLWRNORM
  35#undef POLLWRBAND
  36#define pollfd compat_pollfd
  37#endif
  38
  39/* fake a poll(2) environment */
  40#define POLLIN      0x0001      /* any readable data available   */
  41#define POLLPRI     0x0002      /* OOB/Urgent readable data      */
  42#define POLLOUT     0x0004      /* file descriptor is writeable  */
  43#define POLLERR     0x0008      /* some poll error occurred      */
  44#define POLLHUP     0x0010      /* file descriptor was "hung up" */
  45#define POLLNVAL    0x0020      /* requested events "invalid"    */
  46#define POLLRDNORM  0x0040
  47#define POLLRDBAND  0x0080
  48#define POLLWRNORM  0x0100
  49#define POLLWRBAND  0x0200
  50
  51struct pollfd
  52{
  53  int fd;                       /* which file descriptor to poll */
  54  short events;                 /* events we are interested in   */
  55  short revents;                /* events found on return        */
  56};
  57
  58typedef unsigned long nfds_t;
  59
  60extern int poll (struct pollfd *pfd, nfds_t nfd, int timeout);
  61
  62/* Define INFTIM only if doing so conforms to POSIX.  */
  63#if !defined (_POSIX_C_SOURCE) && !defined (_XOPEN_SOURCE)
  64#define INFTIM (-1)
  65#endif
  66
  67#endif /* _GL_POLL_H */