lib/poll.in.h

   1 /* Header for poll(2) emulation
   2    Contributed by Paolo Bonzini.
   3
   4    Copyright 2001-2003, 2007, 2009-2020 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 <https://www.gnu.org/licenses/>.  */
  20
  21 #ifndef _@GUARD_PREFIX@_POLL_H
  22
  23 #if __GNUC__ >= 3
  24 @PRAGMA_SYSTEM_HEADER@
  25 #endif
  26 @PRAGMA_COLUMNS@
  27
  28 /* The include_next requires a split double-inclusion guard.  */
  29 #if @HAVE_POLL_H@
  30 # @INCLUDE_NEXT@ @NEXT_POLL_H@
  31 #endif
  32
  33 #ifndef _@GUARD_PREFIX@_POLL_H
  34 #define _@GUARD_PREFIX@_POLL_H
  35
  36 /* On native Windows, get the 'struct pollfd' type and the POLL* macro
  37    definitions before we override them.  mingw defines them in <winsock2.h>
  38    if _WIN32_WINNT >= 0x0600.  */
  39 #if @HAVE_WINSOCK2_H@
  40 # include <winsock2.h>
  41 #endif
  42
  43
  44 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
  45
  46 /* The definition of _GL_WARN_ON_USE is copied here.  */
  47
  48
  49 #if !@HAVE_POLL_H@
  50
  51 # if @HAVE_WINSOCK2_H@
  52 /* Override the definitions from <winsock2.h>.  */
  53 #  undef POLLIN
  54 #  undef POLLPRI
  55 #  undef POLLOUT
  56 #  undef POLLERR
  57 #  undef POLLHUP
  58 #  undef POLLNVAL
  59 #  undef POLLRDNORM
  60 #  undef POLLRDBAND
  61 #  undef POLLWRNORM
  62 #  undef POLLWRBAND
  63 #  define pollfd rpl_pollfd
  64 # endif
  65
  66 /* fake a poll(2) environment */
  67 # define POLLIN      0x0001      /* any readable data available   */
  68 # define POLLPRI     0x0002      /* OOB/Urgent readable data      */
  69 # define POLLOUT     0x0004      /* file descriptor is writable   */
  70 # define POLLERR     0x0008      /* some poll error occurred      */
  71 # define POLLHUP     0x0010      /* file descriptor was "hung up" */
  72 # define POLLNVAL    0x0020      /* requested events "invalid"    */
  73 # define POLLRDNORM  0x0040
  74 # define POLLRDBAND  0x0080
  75 # define POLLWRNORM  0x0100
  76 # define POLLWRBAND  0x0200
  77
  78 # if !GNULIB_defined_poll_types
  79
  80 struct pollfd
  81 {
  82   int fd;                       /* which file descriptor to poll */
  83   short events;                 /* events we are interested in   */
  84   short revents;                /* events found on return        */
  85 };
  86
  87 typedef unsigned long nfds_t;
  88
  89 #  define GNULIB_defined_poll_types 1
  90 # endif
  91
  92 /* Define INFTIM only if doing so conforms to POSIX.  */
  93 # if !defined (_POSIX_C_SOURCE) && !defined (_XOPEN_SOURCE)
  94 #  define INFTIM (-1)
  95 # endif
  96
  97 #endif
  98
  99
 100 #if @GNULIB_POLL@
 101 # if @REPLACE_POLL@
 102 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 103 #   undef poll
 104 #   define poll rpl_poll
 105 #  endif
 106 _GL_FUNCDECL_RPL (poll, int, (struct pollfd *pfd, nfds_t nfd, int timeout));
 107 _GL_CXXALIAS_RPL (poll, int, (struct pollfd *pfd, nfds_t nfd, int timeout));
 108 # else
 109 #  if !@HAVE_POLL@
 110 _GL_FUNCDECL_SYS (poll, int, (struct pollfd *pfd, nfds_t nfd, int timeout));
 111 #  endif
 112 _GL_CXXALIAS_SYS (poll, int, (struct pollfd *pfd, nfds_t nfd, int timeout));
 113 # endif
 114 _GL_CXXALIASWARN (poll);
 115 #elif defined GNULIB_POSIXCHECK
 116 # undef poll
 117 # if HAVE_RAW_DECL_POLL
 118 _GL_WARN_ON_USE (poll, "poll is unportable - "
 119                  "use gnulib module poll for portability");
 120 # endif
 121 #endif
 122
 123
 124 #endif /* _@GUARD_PREFIX@_POLL_H */
 125 #endif /* _@GUARD_PREFIX@_POLL_H */