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* include/sys/select.h: Make select FD_COPY and FD_ZERO macros single statements. [ Bugzilla 1001986 ]
author jld
date Mon, 16 Jun 2014 10:03:58 +0000
parents 74dbf4c3f2e1
children
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1 /*========================================================================
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2 //
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3 // sys/select.h
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4 //
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5 // POSIX definitions for select()
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6 //
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7 //========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2014 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): jlarmour
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43 // Contributors:
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44 // Date: 2001-07-26
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45 // Purpose: This file provides the macros, types and functions
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46 // required by POSIX 1003.1.
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47 // Description: Much of the real contents of this file get set from the
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48 // configuration (set by the implementation)
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49 // Usage: #include <sys/select.h>
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //======================================================================
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54 */
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55
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56 /* CONFIGURATION */
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57
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58 #include <pkgconf/system.h>
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59 #include <pkgconf/isoinfra.h> /* Configuration header */
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60
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61 #ifdef CYGPKG_IO_FILEIO
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62 #include <pkgconf/io_fileio.h>
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63 #define FD_SETSIZE CYGNUM_FILEIO_NFD
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64 #endif
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65
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66 /* ------------------------------------------------------------------- */
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67
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68 #if !defined(_POSIX_SOURCE)
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69
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70 #ifdef CYGINT_ISO_SELECT
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71 # ifdef CYGBLD_ISO_SELECT_HEADER
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72 # include CYGBLD_ISO_SELECT_HEADER
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73 # else
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74
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75 # ifndef CYGONCE_ISO_SYS_SELECT_FD_SETS
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76 # define CYGONCE_ISO_SYS_SELECT_FD_SETS
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77
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78 #define NBBY 8 /* number of bits in a byte */
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79
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80 /*
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81 * Select uses bit masks of file descriptors in longs. These macros
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82 * manipulate such bit fields (the filesystem macros use chars).
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83 * FD_SETSIZE may be defined by the user, but the default here should
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84 * be enough for most uses.
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85 */
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86 #ifndef FD_SETSIZE
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87 #define FD_SETSIZE 256
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88 #endif
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89
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90 typedef unsigned int fd_mask;
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91 #define __NFDBITS (sizeof(fd_mask) * NBBY) /* bits per mask */
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92
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93 #ifndef __howmany
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94 #define __howmany(__x, __y) (((__x) + ((__y) - 1)) / (__y))
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95 #endif
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96
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97 typedef struct fd_set {
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98 fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];
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99 } fd_set;
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100
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101 #define FD_SET(__n, __p) ((__p)->fds_bits[(__n)/__NFDBITS] |= (1 << ((__n) % __NFDBITS)))
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102 #define FD_CLR(__n, __p) ((__p)->fds_bits[(__n)/__NFDBITS] &= ~(1 << ((__n) % __NFDBITS)))
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103 #define FD_ISSET(__n, __p) ((__p)->fds_bits[(__n)/__NFDBITS] & (1 << ((__n) % __NFDBITS)))
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104
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105 #define FD_COPY(__f, __t) CYG_MACRO_START \
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106 unsigned int _i; \
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107 for( _i = 0; _i < __howmany(FD_SETSIZE, __NFDBITS) ; _i++ ) \
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108 (__t)->fds_bits[_i] = (__f)->fds_bits[_i]; \
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109 CYG_MACRO_END
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110
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111 #define FD_ZERO(__p) CYG_MACRO_START \
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112 unsigned int _i; \
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113 for( _i = 0; _i < __howmany(FD_SETSIZE, __NFDBITS) ; _i++ ) \
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114 (__p)->fds_bits[_i] = 0; \
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115 CYG_MACRO_END
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116
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117 # endif /* CYGONCE_ISO_SYS_SELECT_FD_SETS */
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118
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119 # ifndef __NEED_FD_SETS_ONLY
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120
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121 # ifndef CYGONCE_ISO_SYS_SELECT_H
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122 # define CYGONCE_ISO_SYS_SELECT_H
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123
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124 # ifdef __cplusplus
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125 extern "C" {
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126 # endif
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127
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128 struct timeval;
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129 extern int
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130 select( int /* nfd */, fd_set * /* in */, fd_set * /* out */,
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131 fd_set * /* ex */, struct timeval * /* tv */ );
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132
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133 #ifdef CYGPKG_POSIX
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134 # include <pkgconf/posix.h>
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135 # ifdef CYGPKG_POSIX_SIGNALS
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136 # include <signal.h>
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137 struct timespec;
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138 extern int
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139 pselect( int /* nfd */, fd_set * /* in */, fd_set * /* out */,
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140 fd_set * /* ex */, const struct timespec * /* ts */,
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141 const sigset_t * /* mask */);
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142 # endif
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143 #endif
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144
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145 # ifdef __cplusplus
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146 } /* extern "C" */
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147 # endif
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148
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149 # endif /* CYGONCE_ISO_SYS_SELECT_H multiple inclusion protection */
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150
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151 # endif /* __NEED_FD_SETS_ONLY */
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152
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153 # endif
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154 #endif
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155
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156
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157 #endif /* if !defined(_POSIX_SOURCE) */
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158 /* ------------------------------------------------------------------- */
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159
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160 /* EOF sys/select.h */