reactos/dll/win32/libtirpc/src/rpc_dtablesize.c

   1 /*
   2  * Copyright (c) 2009, Sun Microsystems, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  * - Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  * - Redistributions in binary form must reproduce the above copyright notice,
  10  *   this list of conditions and the following disclaimer in the documentation
  11  *   and/or other materials provided with the distribution.
  12  * - Neither the name of Sun Microsystems, Inc. nor the names of its
  13  *   contributors may be used to endorse or promote products derived
  14  *   from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <wintirpc.h>
  30 //#include <unistd.h>
  31
  32 //#include <sys/select.h>
  33
  34 int _rpc_dtablesize(void);      /* XXX */
  35
  36 /*
  37  * Cache the result of getdtablesize(), so we don't have to do an
  38  * expensive system call every time.
  39  */
  40 /*
  41  * XXX In FreeBSD 2.x, you can have the maximum number of open file
  42  * descriptors be greater than FD_SETSIZE (which is 256 by default).
  43  *
  44  * Since old programs tend to use this call to determine the first arg
  45  * for _select(), having this return > FD_SETSIZE is a Bad Idea(TM)!
  46  */
  47 int
  48 _rpc_dtablesize(void)
  49 {
  50 #ifdef _WIN32
  51         return FD_SETSIZE;
  52 #else
  53         static int size;
  54
  55         if (size == 0) {
  56                 size = getdtablesize();
  57                 if (size > FD_SETSIZE)
  58                         size = FD_SETSIZE;
  59         }
  60         return (size);
  61 #endif
  62 }