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
  51 struct 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
  58 typedef unsigned long nfds_t;
  59
  60 extern 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 */