xapian-core/common/safesysselect.h

   1 /** @file safesysselect.h
   2  * @brief #include <sys/select.h> with portability workarounds.
   3  */
   4 /* Copyright (C) 2007,2011 Olly Betts
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2 of the
   9  * License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #ifndef XAPIAN_INCLUDED_SAFESYSSELECT_H
  22 #define XAPIAN_INCLUDED_SAFESYSSELECT_H
  23
  24 #ifndef PACKAGE
  25 # error You must #include <config.h> before #include "safesysselect.h"
  26 #endif
  27
  28 #ifndef __WIN32__
  29 # ifdef HAVE_SYS_SELECT_H
  30 // According to POSIX 1003.1-2001.
  31 #  include <sys/select.h>
  32 # else
  33 // According to earlier standards.
  34 #  include <sys/time.h>
  35 #  include <sys/types.h>
  36 #  include <unistd.h>
  37 # endif
  38
  39 // On Solaris FD_SET uses memset but fails to prototype it.
  40 # include <cstring>
  41
  42 #else
  43 // Under __WIN32__, socket() returns the unsigned type SOCKET.  We can safely
  44 // assign that to an int (it'll be a non-negative fd or INVALID_SOCKET, which
  45 // will cast to -1 as an int), but when we use int in FD_SET, we get a warning
  46 // about comparing signed and unsigned, so we add a wrapper to cast the fd
  47 // argument of FD_SET to unsigned.
  48
  49 // select() and FD_SET() are defined in <winsock2.h>:
  50 # include "safewinsock2.h"
  51 inline void xapian_FD_SET_(int fd, fd_set *set) {
  52     FD_SET(unsigned(fd), set);
  53 }
  54 # ifdef FD_SET
  55 #  undef FD_SET
  56 # endif
  57 # define FD_SET(FD,SET) xapian_FD_SET_(FD,SET)
  58 #endif
  59
  60 #endif // XAPIAN_INCLUDED_SAFESYSSELECT_H