1 | //vio_select.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009-2010 |
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5 | * |
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6 | * This file is part of libroar a part of RoarAudio, |
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7 | * a cross-platform sound system for both, home and professional use. |
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8 | * See README for details. |
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9 | * |
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10 | * This file is free software; you can redistribute it and/or modify |
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11 | * it under the terms of the GNU General Public License version 3 |
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12 | * as published by the Free Software Foundation. |
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13 | * |
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14 | * libroar is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with this software; see the file COPYING. If not, write to |
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21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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22 | * Boston, MA 02110-1301, USA. |
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23 | * |
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24 | * NOTE for everyone want's to change something and send patches: |
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25 | * read README and HACKING! There a addition information on |
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26 | * the license of this document you need to read before you send |
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27 | * any patches. |
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28 | * |
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29 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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30 | * or libpulse*: |
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31 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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32 | * and are therefore GPL. Because of this it may be illigal to use |
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33 | * them with any software that uses libesd, libartsc or libpulse*. |
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34 | */ |
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35 | |
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36 | #include "libroar.h" |
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37 | |
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38 | ssize_t roar_vio_select(struct roar_vio_select * vios, size_t len, struct roar_vio_selecttv * rtv, struct roar_vio_selectctl * ctl) { |
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39 | struct timeval tv; |
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40 | size_t i; |
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41 | int max_fh = -1; |
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42 | int ret; |
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43 | fd_set rfds, wfds, efds; |
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44 | |
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45 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p) = ?", vios, (long long unsigned int)len, rtv, ctl); |
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46 | |
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47 | if ( len == 0 ) { |
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48 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p) = 0", vios, (long long unsigned int)len, rtv, ctl); |
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49 | return 0; |
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50 | } |
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51 | |
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52 | if ( vios == NULL ) { |
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53 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p) = -1", vios, (long long unsigned int)len, rtv, ctl); |
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54 | return -1; |
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55 | } |
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56 | |
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57 | // pepaer interl structs: |
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58 | for (i = 0; i < len; i++) { |
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59 | if ( vios[i].fh == -1 ) { |
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60 | vios[i].internal.action = ROAR_VIO_SELECT_ACTION_NONE; |
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61 | |
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62 | if ( vios[i].eventsq & ROAR_VIO_SELECT_READ ) { |
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63 | if ( roar_vio_ctl(vios[i].vio, ROAR_VIO_CTL_GET_SELECT_READ_FH, &(vios[i].internal.fh[0])) == -1 ) { |
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64 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_VIOS; |
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65 | vios[i].internal.fh[0] = -1; |
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66 | } else { |
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67 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_SELECT; |
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68 | } |
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69 | } |
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70 | |
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71 | if ( vios[i].eventsq & ROAR_VIO_SELECT_WRITE ) { |
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72 | if ( roar_vio_ctl(vios[i].vio, ROAR_VIO_CTL_GET_SELECT_WRITE_FH, &(vios[i].internal.fh[1])) == -1 ) { |
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73 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_VIOS; |
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74 | vios[i].internal.fh[1] = -1; |
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75 | } else { |
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76 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_SELECT; |
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77 | } |
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78 | } |
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79 | |
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80 | if ( vios[i].eventsq & ROAR_VIO_SELECT_EXCEPT ) { |
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81 | if ( roar_vio_ctl(vios[i].vio, ROAR_VIO_CTL_GET_SELECT_FH, &(vios[i].internal.fh[2])) == -1 ) { |
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82 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_VIOS; |
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83 | vios[i].internal.fh[2] = -1; |
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84 | } else { |
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85 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_SELECT; |
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86 | } |
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87 | } |
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88 | } else { |
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89 | vios[i].internal.action = ROAR_VIO_SELECT_ACTION_SELECT; |
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90 | vios[i].internal.fh[0] = vios[i].fh; |
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91 | vios[i].internal.fh[1] = vios[i].fh; |
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92 | vios[i].internal.fh[2] = vios[i].fh; |
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93 | } |
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94 | } |
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95 | |
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96 | // check: |
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97 | for (i = 0; i < len; i++) { |
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98 | if ( !( vios[i].internal.action == 0 || vios[i].internal.action == ROAR_VIO_SELECT_ACTION_SELECT ) ) { |
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99 | // we currently do not support non-select selects. |
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100 | // TODO: Fix this. |
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101 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p) = -1", vios, (long long unsigned int)len, rtv, ctl); |
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102 | return -1; |
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103 | } |
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104 | } |
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105 | |
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106 | // prepaer fdsets: |
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107 | FD_ZERO(&rfds); |
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108 | FD_ZERO(&wfds); |
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109 | FD_ZERO(&efds); |
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110 | |
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111 | for (i = 0; i < len; i++) { |
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112 | if ( vios[i].eventsq & ROAR_VIO_SELECT_READ ) { |
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113 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p): vios[i=%i] is READ, fh=%i", vios, (long long unsigned int)len, rtv, ctl, i, vios[i].internal.fh[0]); |
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114 | FD_SET(vios[i].internal.fh[0], &rfds); |
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115 | if ( vios[i].internal.fh[0] > max_fh ) |
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116 | max_fh = vios[i].internal.fh[0]; |
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117 | } |
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118 | |
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119 | if ( vios[i].eventsq & ROAR_VIO_SELECT_WRITE ) { |
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120 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p): vios[i=%i] is WRITE, fh=%i", vios, (long long unsigned int)len, rtv, ctl, i, vios[i].internal.fh[1]); |
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121 | FD_SET(vios[i].internal.fh[1], &wfds); |
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122 | if ( vios[i].internal.fh[1] > max_fh ) |
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123 | max_fh = vios[i].internal.fh[1]; |
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124 | } |
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125 | |
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126 | if ( vios[i].eventsq & ROAR_VIO_SELECT_EXCEPT ) { |
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127 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p): vios[i=%i] is EXCEPT, fh=%i", vios, (long long unsigned int)len, rtv, ctl, i, vios[i].internal.fh[2]); |
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128 | FD_SET(vios[i].internal.fh[2], &efds); |
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129 | if ( vios[i].internal.fh[2] > max_fh ) |
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130 | max_fh = vios[i].internal.fh[2]; |
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131 | } |
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132 | } |
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133 | |
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134 | // the the select: |
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135 | if ( rtv == NULL ) { |
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136 | tv.tv_sec = 1024; |
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137 | tv.tv_usec = 0; |
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138 | } else { |
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139 | tv.tv_sec = rtv->sec; |
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140 | tv.tv_usec = rtv->nsec / 1000; |
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141 | } |
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142 | |
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143 | |
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144 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p): Doing select() with max_fh=%i", vios, (long long unsigned int)len, rtv, ctl, max_fh); |
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145 | ret = select(max_fh + 1, &rfds, &wfds, &efds, &tv); |
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146 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p): select() returned %i", vios, (long long unsigned int)len, rtv, ctl, ret); |
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147 | |
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148 | // ret == -1 -> Error |
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149 | // ret == 0 -> No data |
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150 | if ( ret < 1 ) { |
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151 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p) = %lli", vios, (long long unsigned int)len, rtv, ctl, (long long int)ret); |
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152 | return ret; |
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153 | } |
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154 | |
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155 | // set eventsa: |
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156 | for (i = 0; i < len; i++) { |
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157 | vios[i].eventsa = ROAR_VIO_SELECT_NONE; |
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158 | |
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159 | if ( vios[i].eventsq & ROAR_VIO_SELECT_READ ) |
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160 | if ( FD_ISSET(vios[i].internal.fh[0], &rfds) ) |
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161 | vios[i].eventsa |= ROAR_VIO_SELECT_READ; |
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162 | |
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163 | if ( vios[i].eventsq & ROAR_VIO_SELECT_WRITE ) |
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164 | if ( FD_ISSET(vios[i].internal.fh[1], &wfds) ) |
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165 | vios[i].eventsa |= ROAR_VIO_SELECT_WRITE; |
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166 | |
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167 | if ( vios[i].eventsq & ROAR_VIO_SELECT_EXCEPT ) |
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168 | if ( FD_ISSET(vios[i].internal.fh[2], &efds) ) |
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169 | vios[i].eventsa |= ROAR_VIO_SELECT_EXCEPT; |
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170 | } |
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171 | |
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172 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p) = %lli", vios, (long long unsigned int)len, rtv, ctl, (long long int)ret); |
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173 | return ret; |
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174 | } |
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175 | |
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176 | //ll |
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