1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | /* $NetBSD: rpc_dtablesize.c,v 1.14 1998/11/15 17:32:43 christos Exp $ */ |
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4 | |
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5 | /*- |
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6 | * Copyright (c) 2009, Sun Microsystems, Inc. |
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7 | * All rights reserved. |
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8 | * |
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9 | * Redistribution and use in source and binary forms, with or without |
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10 | * modification, are permitted provided that the following conditions are met: |
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11 | * - Redistributions of source code must retain the above copyright notice, |
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12 | * this list of conditions and the following disclaimer. |
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13 | * - Redistributions in binary form must reproduce the above copyright notice, |
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14 | * this list of conditions and the following disclaimer in the documentation |
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15 | * and/or other materials provided with the distribution. |
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16 | * - Neither the name of Sun Microsystems, Inc. nor the names of its |
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17 | * contributors may be used to endorse or promote products derived |
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18 | * from this software without specific prior written permission. |
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19 | * |
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20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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21 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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24 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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30 | * POSSIBILITY OF SUCH DAMAGE. |
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31 | */ |
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32 | |
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33 | #if defined(LIBC_SCCS) && !defined(lint) |
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34 | static char *sccsid2 = "@(#)rpc_dtablesize.c 1.2 87/08/11 Copyr 1987 Sun Micro"; |
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35 | static char *sccsid = "@(#)rpc_dtablesize.c 2.1 88/07/29 4.0 RPCSRC"; |
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36 | #endif |
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37 | #include <sys/cdefs.h> |
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38 | __FBSDID("$FreeBSD$"); |
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39 | |
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40 | #include "namespace.h" |
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41 | #include <unistd.h> |
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42 | #include "un-namespace.h" |
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43 | |
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44 | int _rpc_dtablesize(void); /* XXX */ |
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45 | |
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46 | /* |
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47 | * Cache the result of getdtablesize(), so we don't have to do an |
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48 | * expensive system call every time. |
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49 | */ |
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50 | /* |
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51 | * XXX In FreeBSD 2.x, you can have the maximum number of open file |
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52 | * descriptors be greater than FD_SETSIZE (which us 256 by default). |
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53 | * |
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54 | * Since old programs tend to use this call to determine the first arg |
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55 | * for _select(), having this return > FD_SETSIZE is a Bad Idea(TM)! |
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56 | */ |
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57 | int |
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58 | _rpc_dtablesize(void) |
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59 | { |
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60 | static int size; |
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61 | |
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62 | if (size == 0) { |
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63 | size = getdtablesize(); |
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64 | if (size > FD_SETSIZE) |
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65 | size = FD_SETSIZE; |
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66 | } |
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67 | return (size); |
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68 | } |
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