1 select.h |
1 /*- |
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2 * Copyright (c) 1992, 1993 |
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3 * The Regents of the University of California. All rights reserved. |
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4 * |
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5 * Redistribution and use in source and binary forms, with or without |
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6 * modification, are permitted provided that the following conditions |
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7 * are met: |
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8 * 1. Redistributions of source code must retain the above copyright |
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9 * notice, this list of conditions and the following disclaimer. |
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10 * 2. Redistributions in binary form must reproduce the above copyright |
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11 * notice, this list of conditions and the following disclaimer in the |
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12 * documentation and/or other materials provided with the distribution. |
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13 * 4. Neither the name of the University nor the names of its contributors |
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14 * may be used to endorse or promote products derived from this software |
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15 * without specific prior written permission. |
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16 * |
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17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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27 * SUCH DAMAGE. |
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28 * |
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29 * $FreeBSD: src/sys/sys/select.h,v 1.19 2004/04/07 04:19:49 imp Exp $ |
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30 */ |
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31 |
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32 #ifndef _SYS_SELECT_H_ |
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33 #define _SYS_SELECT_H_ |
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34 |
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35 #include <sys/cdefs.h> |
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36 #include <sys/_types.h> |
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37 |
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38 #include <sys/_sigset.h> |
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39 #include <sys/_timeval.h> |
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40 #include <sys/timespec.h> |
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41 |
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42 |
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43 typedef unsigned long __fd_mask; |
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44 #if __BSD_VISIBLE |
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45 typedef __fd_mask fd_mask; |
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46 #endif |
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47 |
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48 #ifndef _SIGSET_T_DECLARED |
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49 #define _SIGSET_T_DECLARED |
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50 typedef __uint64_t sigset_t; |
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51 #endif |
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52 |
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53 /* |
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54 * Select uses bit masks of file descriptors in longs. These macros |
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55 * manipulate such bit fields (the filesystem macros use chars). |
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56 * FD_SETSIZE may be defined by the user, but the default here should |
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57 * be enough for most uses. |
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58 */ |
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59 #ifndef FD_SETSIZE |
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60 #define FD_SETSIZE 1024U |
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61 #endif |
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62 |
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63 #define _NFDBITS (sizeof(__fd_mask) * 8) /* bits per mask */ |
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64 #if __BSD_VISIBLE |
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65 #define NFDBITS _NFDBITS |
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66 #endif |
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67 |
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68 #ifndef _howmany |
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69 #define _howmany(x, y) (((x) + ((y) - 1)) / (y)) |
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70 #endif |
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71 |
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72 typedef struct fd_set { |
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73 __fd_mask __fds_bits[_howmany(FD_SETSIZE, _NFDBITS)]; |
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74 } fd_set; |
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75 #if __BSD_VISIBLE |
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76 #define fds_bits __fds_bits |
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77 #endif |
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78 |
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79 #define __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS)) |
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80 #define FD_CLR(n, p) ((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n)) |
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81 #if __BSD_VISIBLE |
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82 #define FD_COPY(f, t) (void)(*(t) = *(f)) |
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83 #endif |
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84 #define FD_ISSET(n, p) ((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n)) |
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85 #define FD_SET(n, p) ((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n)) |
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86 #define FD_ZERO(p) do { \ |
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87 fd_set *_p; \ |
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88 __size_t _n; \ |
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89 \ |
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90 _p = (p); \ |
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91 _n = _howmany(FD_SETSIZE, _NFDBITS); \ |
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92 while (_n > 0) \ |
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93 _p->__fds_bits[--_n] = 0; \ |
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94 } while (0) |
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95 |
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96 #ifndef _KERNEL |
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97 |
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98 __BEGIN_DECLS |
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99 #ifndef _SELECT_DECLARED |
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100 #define _SELECT_DECLARED |
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101 /* XXX missing restrict type-qualifier */ |
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102 IMPORT_C int select(int, fd_set *, fd_set *, fd_set *, struct timeval *); |
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103 #endif |
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104 __END_DECLS |
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105 #endif /* !_KERNEL */ |
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106 |
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107 #endif /* _SYS_SELECT_H_ */ |