1 | //vio_cmd.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008 |
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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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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22 | * |
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23 | * NOTE for everyone want's to change something and send patches: |
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24 | * read README and HACKING! There a addition information on |
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25 | * the license of this document you need to read before you send |
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26 | * any patches. |
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27 | * |
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28 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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29 | * or libpulse*: |
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30 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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31 | * and are therefore GPL. Because of this it may be illigal to use |
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32 | * them with any software that uses libesd, libartsc or libpulse*. |
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33 | */ |
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34 | |
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35 | #include "libroar.h" |
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36 | |
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37 | int roar_vio_open_cmd(struct roar_vio_calls * calls, struct roar_vio_calls * dst, |
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38 | char * reader, char * writer, int options) { |
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39 | struct roar_vio_cmd_state * state; |
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40 | |
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41 | if ( calls == NULL || dst == NULL ) |
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42 | return -1; |
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43 | |
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44 | if ( reader == NULL && writer == NULL ) |
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45 | return -1; |
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46 | |
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47 | if ( (state = malloc(sizeof(struct roar_vio_cmd_state))) == NULL ) |
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48 | return -1; |
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49 | |
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50 | ROAR_DBG("roar_vio_open_cmd(*): pre reqs are OK"); |
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51 | |
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52 | // clear all |
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53 | memset(calls, 0, sizeof(struct roar_vio_calls)); |
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54 | memset(state, 0, sizeof(struct roar_vio_cmd_state)); |
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55 | |
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56 | // init reader and writer: |
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57 | state->reader.pid = -1; |
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58 | state->reader.in = -1; |
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59 | state->reader.out = -1; |
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60 | |
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61 | if ( reader != NULL ) |
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62 | state->reader.cmd = strdup(reader); |
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63 | |
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64 | state->writer.pid = -1; |
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65 | state->writer.in = -1; |
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66 | state->writer.out = -1; |
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67 | |
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68 | if ( writer != NULL ) |
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69 | state->writer.cmd = strdup(writer); |
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70 | |
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71 | // init state |
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72 | state->next = dst; |
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73 | state->options = options; |
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74 | |
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75 | // init calls |
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76 | calls->close = roar_vio_cmd_close; |
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77 | calls->read = roar_vio_cmd_read; |
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78 | calls->write = roar_vio_cmd_write; |
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79 | calls->nonblock = roar_vio_cmd_nonblock; |
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80 | calls->sync = roar_vio_cmd_sync; |
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81 | calls->inst = (void*) state; |
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82 | |
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83 | ROAR_DBG("roar_vio_open_cmd(*): var setup OK"); |
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84 | |
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85 | if ( !(options & ROAR_VIO_CMD_OPTS_ON_DEMAND) ) { |
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86 | if ( reader != NULL ) |
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87 | if ( roar_vio_cmd_fork(&(state->reader)) == -1 ) |
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88 | return roar_vio_cmd_close(calls); |
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89 | |
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90 | if ( writer != NULL ) |
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91 | if ( roar_vio_cmd_fork(&(state->writer)) == -1 ) |
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92 | return roar_vio_cmd_close(calls); |
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93 | } |
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94 | |
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95 | return 0; |
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96 | } |
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97 | |
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98 | int roar_vio_cmd_close(struct roar_vio_calls * vio) { |
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99 | struct roar_vio_cmd_state * state = (struct roar_vio_cmd_state *)vio->inst; |
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100 | |
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101 | if ( state->writer.opened ) { |
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102 | if ( state->writer.out != -1 ) { |
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103 | close(state->writer.out); |
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104 | state->writer.out = -1; |
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105 | } |
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106 | } |
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107 | |
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108 | roar_vio_cmd_sync(vio); |
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109 | |
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110 | if ( state->reader.opened ) |
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111 | roar_vio_cmd_wait(&(state->reader)); |
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112 | |
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113 | if ( state->writer.opened ) |
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114 | roar_vio_cmd_wait(&(state->writer)); |
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115 | |
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116 | if ( state->reader.cmd != NULL ) |
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117 | free(state->reader.cmd); |
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118 | |
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119 | if ( state->writer.cmd != NULL ) |
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120 | free(state->writer.cmd); |
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121 | |
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122 | roar_vio_close(state->next); |
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123 | |
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124 | free(state); |
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125 | |
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126 | return 0; |
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127 | } |
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128 | |
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129 | int roar_vio_cmd_fork(struct roar_vio_cmd_child * child) { |
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130 | int in[2], out[2]; |
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131 | |
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132 | if ( child == NULL ) |
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133 | return -1; |
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134 | |
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135 | if ( child->opened ) |
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136 | return 0; |
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137 | |
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138 | if ( child->cmd == NULL ) |
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139 | return -1; |
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140 | |
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141 | // open some pipes... |
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142 | if ( pipe(in) != 0 ) |
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143 | return -1; |
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144 | |
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145 | if ( pipe(out) != 0 ) { |
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146 | close(in[0]); |
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147 | close(in[1]); |
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148 | return -1; |
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149 | } |
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150 | |
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151 | child->pid = fork(); |
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152 | |
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153 | switch (child->pid) { |
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154 | case -1: |
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155 | close(in[0]); |
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156 | close(in[1]); |
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157 | close(out[0]); |
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158 | close(out[1]); |
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159 | return -1; |
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160 | break; |
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161 | case 0: |
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162 | close(in[0]); |
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163 | close(out[1]); |
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164 | close(ROAR_STDIN); |
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165 | close(ROAR_STDOUT); |
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166 | |
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167 | if ( dup2(out[0], ROAR_STDIN) == -1 ) |
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168 | _exit(1); |
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169 | |
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170 | if ( dup2(in[1], ROAR_STDOUT) == -1 ) |
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171 | _exit(1); |
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172 | |
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173 | execlp("/bin/sh", "/bin/sh", "-c", child->cmd, NULL); |
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174 | |
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175 | _exit(1); |
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176 | break; |
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177 | } |
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178 | |
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179 | close(in[1]); |
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180 | close(out[0]); |
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181 | |
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182 | child->opened = 1; |
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183 | child->in = in[0]; |
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184 | child->out = out[1]; |
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185 | |
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186 | return 0; |
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187 | } |
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188 | |
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189 | int roar_vio_cmd_wait(struct roar_vio_cmd_child * child) { |
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190 | int status; |
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191 | |
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192 | if ( child == NULL ) |
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193 | return -1; |
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194 | |
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195 | if ( !child->opened ) |
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196 | return 0; |
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197 | |
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198 | if ( child->out != -1 ) |
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199 | close(child->out); |
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200 | |
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201 | if ( child->in != -1 ) |
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202 | close(child->in); |
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203 | |
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204 | waitpid(child->pid, &status, 0); |
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205 | |
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206 | return 0; |
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207 | } |
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208 | |
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209 | // VIOs: |
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210 | |
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211 | ssize_t roar_vio_cmd_read (struct roar_vio_calls * vio, void *buf, size_t count) { |
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212 | struct roar_vio_cmd_state * state = (struct roar_vio_cmd_state *)vio->inst; |
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213 | fd_set rfhs[1], wfhs[1]; |
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214 | struct timeval tv; |
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215 | size_t done = 0; |
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216 | int max_fh; |
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217 | int ret; |
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218 | char tbuf[ROAR_VIO_CMD_BUFSIZE]; |
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219 | char * tp = NULL; |
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220 | size_t tlen = 0; |
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221 | int nonblock = state->options & ROAR_VIO_CMD_OPTS_NONBLOCK; |
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222 | int in, out; |
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223 | |
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224 | ROAR_DBG("roar_vio_cmd_read(*) = ?"); |
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225 | |
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226 | if ( !state->reader.opened ) { |
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227 | if ( buf == NULL && count == 0 ) /* sync: no need to do anything if no reader is forked :) */ |
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228 | return 0; |
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229 | |
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230 | if ( !(state->options & ROAR_VIO_CMD_OPTS_ON_DEMAND) ) /* we are not on demand and no reader exists? -> err */ |
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231 | return -1; |
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232 | |
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233 | if ( roar_vio_cmd_fork(&(state->reader)) == -1 ) |
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234 | return -1; |
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235 | } |
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236 | |
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237 | in = state->reader.in; |
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238 | out = state->reader.out; |
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239 | |
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240 | while (done < count) { |
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241 | if ( nonblock ) { |
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242 | tv.tv_sec = 0; |
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243 | tv.tv_usec = 1; |
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244 | } else { |
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245 | tv.tv_sec = 3600; |
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246 | tv.tv_usec = 0; |
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247 | } |
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248 | |
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249 | FD_ZERO(rfhs); |
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250 | FD_ZERO(wfhs); |
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251 | |
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252 | FD_SET(in, rfhs); |
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253 | |
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254 | if ( out != -1 ) { |
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255 | FD_SET(out, wfhs); |
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256 | } |
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257 | |
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258 | #ifdef DEBUG |
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259 | if ( FD_ISSET(in, rfhs) ) { |
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260 | ROAR_DBG("roar_vio_cmd_read(*): reader set in fh group"); |
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261 | } |
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262 | #endif |
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263 | |
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264 | max_fh = in > out ? in : out; |
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265 | ROAR_DBG("roar_vio_cmd_read(*): max_fh=%i", max_fh); |
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266 | |
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267 | if ( (ret = select(max_fh + 1, rfhs, wfhs, NULL, &tv)) == -1 ) |
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268 | return -1; |
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269 | |
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270 | ROAR_DBG("roar_vio_cmd_read(*): select(*) = %i", ret); |
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271 | ROAR_DBG("roar_vio_cmd_read(*): reader=%i, writer=%i", in, out); |
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272 | |
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273 | if ( ret > 0 ) { |
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274 | if ( FD_ISSET(in, rfhs) ) { |
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275 | ROAR_DBG("roar_vio_cmd_read(*): event on reader"); |
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276 | |
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277 | if ( (ret = read(in, buf+done, count-done)) == -1 ) |
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278 | break; |
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279 | |
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280 | if ( ret == 0 ) |
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281 | break; |
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282 | |
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283 | done += ret; |
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284 | } |
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285 | |
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286 | if ( out != -1 && FD_ISSET(out, wfhs) ) { |
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287 | ROAR_DBG("roar_vio_cmd_read(*): event on writer"); |
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288 | |
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289 | if ( !tlen ) { |
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290 | tp = tbuf; |
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291 | tlen = 0; |
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292 | if ( (tlen = roar_vio_read(state->next, tp, ROAR_VIO_CMD_BUFSIZE)) == -1 ) |
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293 | continue; |
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294 | } |
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295 | |
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296 | if ( tlen ) { |
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297 | if ( (ret = write(out, tp, tlen)) > 0 ) { |
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298 | tlen -= ret; |
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299 | tp += ret; |
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300 | } |
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301 | } else { |
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302 | close(out); |
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303 | state->reader.out = out = -1; |
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304 | } |
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305 | } |
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306 | } |
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307 | |
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308 | if ( nonblock ) |
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309 | break; |
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310 | } |
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311 | |
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312 | if ( tlen ) { /* we have some data to write to the child... */ |
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313 | // TODO: try to write it out... |
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314 | return -1; |
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315 | } |
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316 | |
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317 | return done; |
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318 | } |
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319 | |
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320 | ssize_t roar_vio_cmd_write (struct roar_vio_calls * vio, void *buf, size_t count) { |
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321 | struct roar_vio_cmd_state * state = (struct roar_vio_cmd_state *)vio->inst; |
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322 | fd_set rfhs[1], wfhs[1]; |
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323 | struct timeval tv; |
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324 | size_t done = 0; |
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325 | int max_fh; |
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326 | int ret; |
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327 | char tbuf[ROAR_VIO_CMD_BUFSIZE]; |
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328 | int nonblock = state->options & ROAR_VIO_CMD_OPTS_NONBLOCK; |
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329 | int in, out; |
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330 | |
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331 | if ( !state->writer.opened ) { |
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332 | if ( buf == NULL && count == 0 ) /* sync: no need to do anything if no writer is forked :) */ |
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333 | return 0; |
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334 | |
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335 | if ( !(state->options & ROAR_VIO_CMD_OPTS_ON_DEMAND) ) /* we are not on demand and no writer exists? -> err */ |
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336 | return -1; |
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337 | |
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338 | if ( roar_vio_cmd_fork(&(state->writer)) == -1 ) |
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339 | return -1; |
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340 | } |
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341 | |
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342 | in = state->writer.in; |
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343 | out = state->writer.out; |
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344 | |
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345 | if ( buf == NULL ) { // we are requested to sync |
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346 | if ( in != -1 ) { |
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347 | ret = 1; |
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348 | done = 0; |
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349 | while (ret > 0) { |
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350 | tv.tv_sec = 0; |
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351 | tv.tv_usec = done ? 1 : 500000; // half a sec |
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352 | |
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353 | done++; |
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354 | |
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355 | FD_ZERO(rfhs); |
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356 | FD_SET(in, rfhs); |
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357 | |
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358 | if ( select(in+1, rfhs, NULL, NULL, &tv) < 1 ) |
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359 | break; |
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360 | |
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361 | ret = read(in, tbuf, ROAR_VIO_CMD_BUFSIZE); |
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362 | |
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363 | if ( roar_vio_write(state->next, tbuf, ret) != ret ) |
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364 | return -1; |
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365 | } |
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366 | } |
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367 | |
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368 | return 0; |
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369 | } |
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370 | |
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371 | while (done < count) { |
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372 | if ( nonblock ) { |
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373 | tv.tv_sec = 0; |
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374 | tv.tv_usec = 1; |
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375 | } else { |
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376 | tv.tv_sec = 3600; |
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377 | tv.tv_usec = 0; |
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378 | } |
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379 | |
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380 | FD_ZERO(rfhs); |
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381 | FD_ZERO(wfhs); |
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382 | |
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383 | FD_SET(out, wfhs); |
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384 | |
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385 | if ( in != -1 ) { |
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386 | FD_SET(in, rfhs); |
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387 | } |
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388 | |
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389 | max_fh = in > out ? in : out; |
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390 | |
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391 | if ( (ret = select(max_fh + 1, rfhs, wfhs, NULL, &tv)) == -1 ) |
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392 | return -1; |
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393 | |
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394 | if ( ret > 0 ) { |
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395 | if ( FD_ISSET(out, wfhs) ) { |
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396 | |
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397 | if ( (ret = write(out, buf+done, count-done)) == -1 ) |
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398 | break; |
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399 | |
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400 | if ( ret == 0 ) |
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401 | break; |
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402 | |
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403 | done += ret; |
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404 | } |
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405 | if ( in != -1 && FD_ISSET(in, wfhs) ) { |
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406 | if ( (ret = read(in, tbuf, ROAR_VIO_CMD_BUFSIZE)) == -1 ) { /* error case: can not read on reader -> EOF */ |
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407 | close(in); |
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408 | state->writer.in = in = -1; |
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409 | break; |
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410 | } |
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411 | |
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412 | if ( roar_vio_write(state->next, tbuf, ret) != ret ) |
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413 | return -1; |
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414 | } |
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415 | } |
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416 | |
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417 | if ( nonblock ) |
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418 | break; |
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419 | } |
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420 | |
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421 | return -1; |
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422 | } |
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423 | |
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424 | int roar_vio_cmd_nonblock(struct roar_vio_calls * vio, int state) { |
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425 | struct roar_vio_cmd_state * self = (struct roar_vio_cmd_state *)vio->inst; |
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426 | |
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427 | self->options |= ROAR_VIO_CMD_OPTS_NONBLOCK; |
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428 | |
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429 | if ( state == ROAR_SOCKET_BLOCK ) |
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430 | self->options -= ROAR_VIO_CMD_OPTS_NONBLOCK; |
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431 | |
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432 | roar_vio_nonblock(self->next, state); // this should help, but may not nessessery. |
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433 | |
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434 | return 0; |
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435 | } |
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436 | |
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437 | int roar_vio_cmd_sync (struct roar_vio_calls * vio) { |
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438 | struct roar_vio_cmd_state * state = (struct roar_vio_cmd_state *)vio->inst; |
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439 | int oldblock; |
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440 | int ret = 0; |
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441 | |
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442 | oldblock = state->options & ROAR_VIO_CMD_OPTS_NONBLOCK ? ROAR_SOCKET_NONBLOCK : ROAR_SOCKET_BLOCK; |
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443 | |
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444 | if ( roar_vio_cmd_nonblock(vio, ROAR_SOCKET_BLOCK) == -1 ) |
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445 | return -1; |
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446 | |
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447 | if ( roar_vio_cmd_write(vio, NULL, 0) == -1 ) |
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448 | ret = -1; |
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449 | |
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450 | if ( roar_vio_cmd_read(vio, NULL, 0) == -1 ) |
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451 | ret = -1; |
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452 | |
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453 | if ( roar_vio_cmd_nonblock(vio, oldblock) == -1 ) |
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454 | return -1; |
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455 | |
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456 | return ret; |
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457 | } |
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458 | |
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459 | // MISC: |
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460 | int roar_vio_open_gzip(struct roar_vio_calls * calls, struct roar_vio_calls * dst, int level) { |
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461 | #ifdef ROAR_HAVE_BIN_GZIP |
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462 | char wbuf[80]; |
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463 | char * writer = ROAR_HAVE_BIN_GZIP " -c"; |
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464 | |
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465 | if ( level != -1 ) { |
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466 | snprintf(wbuf, 80, "%s -c%i", ROAR_HAVE_BIN_GZIP, level); |
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467 | writer = wbuf; |
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468 | } |
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469 | |
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470 | return roar_vio_open_cmd(calls, dst, ROAR_HAVE_BIN_GZIP " -dc", writer, ROAR_VIO_CMD_OPTS_ON_DEMAND); |
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471 | #else |
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472 | return -1; |
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473 | #endif |
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474 | } |
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475 | |
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476 | int roar_vio_open_gpg(struct roar_vio_calls * calls, struct roar_vio_calls * dst, char * pw, int wronly, char * opts, int options) { |
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477 | #ifdef ROAR_HAVE_BIN_GPG |
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478 | char command[1024]; |
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479 | char para[1024] = {0}; |
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480 | int pwpipe[2]; |
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481 | int ret; |
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482 | |
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483 | /* |
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484 | #define ROAR_VIO_PGP_OPTS_NONE 0x00 |
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485 | #define ROAR_VIO_PGP_OPTS_ASCII 0x01 |
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486 | #define ROAR_VIO_PGP_OPTS_SIGN 0x02 |
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487 | #define ROAR_VIO_PGP_OPTS_TEXTMODE 0x04 |
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488 | */ |
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489 | |
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490 | if ( options & ROAR_VIO_PGP_OPTS_ASCII ) |
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491 | strncat(para, "--armor ", 16); |
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492 | |
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493 | if ( options & ROAR_VIO_PGP_OPTS_SIGN ) |
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494 | strncat(para, "--sign ", 16); |
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495 | |
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496 | if ( options & ROAR_VIO_PGP_OPTS_TEXTMODE ) |
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497 | strncat(para, "--textmode ", 16); |
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498 | |
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499 | if ( pw != NULL ) { |
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500 | if ( pipe(pwpipe) == -1 ) |
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501 | return -1; |
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502 | |
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503 | snprintf(command, 1024, "%s --batch --no-verbose --quiet --passphrase-repeat 0 --passphrase-fd %i %s %s", ROAR_HAVE_BIN_GPG, pwpipe[0], para, opts); |
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504 | |
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505 | write(pwpipe[1], pw, strlen(pw)); |
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506 | |
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507 | close(pwpipe[1]); |
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508 | } else { |
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509 | snprintf(command, 1024, "%s --no-verbose --quiet --batch %s %s", ROAR_HAVE_BIN_GPG, para, opts); |
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510 | } |
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511 | |
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512 | if ( wronly ) { |
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513 | ret = roar_vio_open_cmd(calls, dst, NULL, command, 0); |
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514 | } else { |
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515 | ret = roar_vio_open_cmd(calls, dst, command, NULL, 0); |
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516 | } |
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517 | |
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518 | if ( pw != NULL ) |
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519 | close(pwpipe[0]); |
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520 | |
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521 | return ret; |
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522 | #else |
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523 | return -1; |
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524 | #endif |
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525 | } |
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526 | |
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527 | int roar_vio_open_pgp_decrypt(struct roar_vio_calls * calls, struct roar_vio_calls * dst, char * pw) { |
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528 | return roar_vio_open_gpg(calls, dst, pw, 0, "-d", ROAR_VIO_PGP_OPTS_NONE); |
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529 | } |
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530 | |
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531 | int roar_vio_open_pgp_store(struct roar_vio_calls * calls, struct roar_vio_calls * dst, int options) { |
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532 | return roar_vio_open_gpg(calls, dst, NULL, 1, "--store", options); |
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533 | } |
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534 | |
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535 | int roar_vio_open_pgp_encrypt_sym(struct roar_vio_calls * calls, struct roar_vio_calls * dst, char * pw, int options) { |
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536 | return roar_vio_open_gpg(calls, dst, pw, 1, "--symmetric", options); |
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537 | } |
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538 | int roar_vio_open_pgp_encrypt_pub(struct roar_vio_calls * calls, struct roar_vio_calls * dst, char * pw, int options, char * recipient) { |
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539 | char buf[1024]; |
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540 | |
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541 | snprintf(buf, 1024, "-e -r %s", recipient); |
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542 | return roar_vio_open_gpg(calls, dst, pw, 1, buf, options); |
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543 | } |
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544 | |
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545 | //ll |
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