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->reader.opened ) |
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102 | roar_vio_cmd_wait(&(state->reader)); |
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103 | |
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104 | if ( state->writer.opened ) |
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105 | roar_vio_cmd_wait(&(state->writer)); |
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106 | |
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107 | if ( state->reader.cmd != NULL ) |
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108 | free(state->reader.cmd); |
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109 | |
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110 | if ( state->writer.cmd != NULL ) |
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111 | free(state->writer.cmd); |
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112 | |
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113 | roar_vio_close(state->next); |
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114 | |
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115 | free(state); |
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116 | |
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117 | return 0; |
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118 | } |
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119 | |
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120 | int roar_vio_cmd_fork(struct roar_vio_cmd_child * child) { |
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121 | int in[2], out[2]; |
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122 | |
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123 | if ( child == NULL ) |
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124 | return -1; |
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125 | |
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126 | if ( child->opened ) |
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127 | return 0; |
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128 | |
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129 | if ( child->cmd == NULL ) |
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130 | return -1; |
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131 | |
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132 | // open some pipes... |
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133 | if ( pipe(in) != 0 ) |
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134 | return -1; |
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135 | |
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136 | if ( pipe(out) != 0 ) { |
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137 | close(in[0]); |
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138 | close(in[1]); |
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139 | return -1; |
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140 | } |
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141 | |
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142 | child->pid = fork(); |
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143 | |
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144 | switch (child->pid) { |
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145 | case -1: |
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146 | close(in[0]); |
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147 | close(in[1]); |
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148 | close(out[0]); |
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149 | close(out[1]); |
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150 | return -1; |
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151 | break; |
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152 | case 0: |
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153 | close(in[0]); |
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154 | close(out[1]); |
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155 | close(ROAR_STDIN); |
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156 | close(ROAR_STDOUT); |
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157 | |
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158 | if ( dup2(out[0], ROAR_STDIN) == -1 ) |
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159 | _exit(1); |
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160 | |
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161 | if ( dup2(in[1], ROAR_STDOUT) == -1 ) |
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162 | _exit(1); |
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163 | |
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164 | execlp("/bin/sh", "/bin/sh", "-c", child->cmd, NULL); |
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165 | |
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166 | _exit(1); |
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167 | break; |
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168 | } |
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169 | |
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170 | close(in[1]); |
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171 | close(out[0]); |
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172 | |
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173 | child->opened = 1; |
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174 | child->in = in[0]; |
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175 | child->out = out[1]; |
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176 | |
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177 | return 0; |
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178 | } |
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179 | |
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180 | int roar_vio_cmd_wait(struct roar_vio_cmd_child * child) { |
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181 | int status; |
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182 | |
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183 | if ( child == NULL ) |
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184 | return -1; |
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185 | |
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186 | if ( !child->opened ) |
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187 | return 0; |
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188 | |
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189 | if ( child->out != -1 ) |
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190 | close(child->out); |
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191 | |
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192 | if ( child->in != -1 ) |
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193 | close(child->in); |
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194 | |
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195 | waitpid(child->pid, &status, 0); |
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196 | |
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197 | return 0; |
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198 | } |
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199 | |
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200 | // VIOs: |
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201 | |
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202 | ssize_t roar_vio_cmd_read (struct roar_vio_calls * vio, void *buf, size_t count) { |
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203 | struct roar_vio_cmd_state * state = (struct roar_vio_cmd_state *)vio->inst; |
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204 | fd_set rfhs[1], wfhs[1]; |
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205 | struct timeval tv; |
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206 | size_t done = 0; |
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207 | int max_fh; |
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208 | int ret; |
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209 | char tbuf[ROAR_VIO_CMD_BUFSIZE]; |
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210 | char * tp = NULL; |
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211 | size_t tlen = 0; |
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212 | |
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213 | ROAR_DBG("roar_vio_cmd_read(*) = ?"); |
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214 | |
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215 | if ( !state->reader.opened ) { |
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216 | if ( buf == NULL && count == 0 ) /* sync: no need to do anything if no reader is forked :) */ |
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217 | return 0; |
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218 | |
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219 | if ( !(state->options & ROAR_VIO_CMD_OPTS_ON_DEMAND) ) /* we are not on demand and no reader exists? -> err */ |
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220 | return -1; |
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221 | |
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222 | if ( roar_vio_cmd_fork(&(state->reader)) == -1 ) |
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223 | return -1; |
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224 | } |
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225 | |
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226 | while (done < count) { |
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227 | if ( state->options & ROAR_VIO_CMD_OPTS_NONBLOCK ) { |
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228 | tv.tv_sec = 0; |
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229 | tv.tv_usec = 1; |
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230 | } else { |
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231 | tv.tv_sec = 3600; |
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232 | tv.tv_usec = 0; |
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233 | } |
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234 | |
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235 | FD_ZERO(rfhs); |
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236 | FD_ZERO(wfhs); |
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237 | |
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238 | FD_SET(state->reader.in, rfhs); |
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239 | |
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240 | if ( state->reader.out != -1 ) { |
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241 | FD_SET(state->reader.out, wfhs); |
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242 | } |
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243 | |
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244 | #ifdef DEBUG |
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245 | if ( FD_ISSET(state->reader.in, rfhs) ) { |
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246 | ROAR_DBG("roar_vio_cmd_read(*): reader set in fh group"); |
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247 | } |
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248 | #endif |
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249 | |
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250 | max_fh = state->reader.in > state->reader.out ? state->reader.in : state->reader.out; |
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251 | ROAR_DBG("roar_vio_cmd_read(*): max_fh=%i", max_fh); |
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252 | |
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253 | if ( (ret = select(max_fh + 1, rfhs, wfhs, NULL, &tv)) == -1 ) |
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254 | return -1; |
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255 | |
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256 | ROAR_DBG("roar_vio_cmd_read(*): select(*) = %i", ret); |
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257 | ROAR_DBG("roar_vio_cmd_read(*): reader=%i, writer=%i", state->reader.in, state->reader.out); |
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258 | |
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259 | if ( ret > 0 ) { |
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260 | if ( FD_ISSET(state->reader.in, rfhs) ) { |
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261 | ROAR_DBG("roar_vio_cmd_read(*): event on reader"); |
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262 | |
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263 | if ( (ret = read(state->reader.in, buf+done, count-done)) == -1 ) |
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264 | break; |
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265 | |
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266 | if ( ret == 0 ) |
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267 | break; |
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268 | |
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269 | done += ret; |
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270 | } |
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271 | |
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272 | if ( state->reader.out != -1 && FD_ISSET(state->reader.out, wfhs) ) { |
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273 | ROAR_DBG("roar_vio_cmd_read(*): event on writer"); |
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274 | |
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275 | if ( !tlen ) { |
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276 | tp = tbuf; |
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277 | tlen = 0; |
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278 | if ( (tlen = roar_vio_read(state->next, tp, ROAR_VIO_CMD_BUFSIZE)) == -1 ) |
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279 | continue; |
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280 | } |
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281 | |
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282 | if ( tlen ) { |
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283 | if ( (ret = write(state->reader.out, tp, tlen)) > 0 ) { |
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284 | tlen -= ret; |
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285 | tp += ret; |
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286 | } |
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287 | } else { |
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288 | close(state->reader.out); |
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289 | state->reader.out = -1; |
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290 | } |
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291 | } |
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292 | } |
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293 | |
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294 | if ( state->options & ROAR_VIO_CMD_OPTS_NONBLOCK ) |
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295 | break; |
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296 | } |
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297 | |
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298 | if ( tlen ) { /* we have some data to write to the child... */ |
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299 | // TODO: try to write it out... |
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300 | return -1; |
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301 | } |
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302 | |
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303 | return done; |
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304 | } |
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305 | |
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306 | ssize_t roar_vio_cmd_write (struct roar_vio_calls * vio, void *buf, size_t count) { |
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307 | struct roar_vio_cmd_state * state = (struct roar_vio_cmd_state *)vio->inst; |
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308 | |
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309 | if ( !state->writer.opened ) { |
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310 | if ( buf == NULL && count == 0 ) /* sync: no need to do anything if no writer is forked :) */ |
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311 | return 0; |
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312 | |
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313 | if ( !(state->options & ROAR_VIO_CMD_OPTS_ON_DEMAND) ) /* we are not on demand and no writer exists? -> err */ |
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314 | return -1; |
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315 | |
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316 | if ( roar_vio_cmd_fork(&(state->writer)) == -1 ) |
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317 | return -1; |
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318 | } |
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319 | |
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320 | |
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321 | return -1; |
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322 | } |
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323 | |
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324 | int roar_vio_cmd_nonblock(struct roar_vio_calls * vio, int state) { |
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325 | struct roar_vio_cmd_state * self = (struct roar_vio_cmd_state *)vio->inst; |
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326 | |
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327 | self->options |= ROAR_VIO_CMD_OPTS_NONBLOCK; |
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328 | |
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329 | if ( state == ROAR_SOCKET_BLOCK ) |
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330 | self->options -= ROAR_VIO_CMD_OPTS_NONBLOCK; |
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331 | |
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332 | roar_vio_nonblock(self->next, state); // this should help, but may not nessessery. |
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333 | |
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334 | return 0; |
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335 | } |
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336 | |
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337 | int roar_vio_cmd_sync (struct roar_vio_calls * vio) { |
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338 | struct roar_vio_cmd_state * state = (struct roar_vio_cmd_state *)vio->inst; |
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339 | int oldblock; |
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340 | int ret = 0; |
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341 | |
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342 | oldblock = state->options & ROAR_VIO_CMD_OPTS_NONBLOCK ? ROAR_SOCKET_NONBLOCK : ROAR_SOCKET_BLOCK; |
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343 | |
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344 | if ( roar_vio_cmd_nonblock(vio, ROAR_SOCKET_BLOCK) == -1 ) |
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345 | return -1; |
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346 | |
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347 | if ( roar_vio_cmd_write(vio, NULL, 0) == -1 ) |
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348 | ret = -1; |
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349 | |
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350 | if ( roar_vio_cmd_read(vio, NULL, 0) == -1 ) |
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351 | ret = -1; |
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352 | |
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353 | if ( roar_vio_cmd_nonblock(vio, oldblock) == -1 ) |
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354 | return -1; |
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355 | |
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356 | return ret; |
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357 | } |
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358 | |
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359 | //ll |
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