1 | //vio_pipe.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009 |
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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_pipe (struct roar_vio_calls * s0, struct roar_vio_calls * s1, int type, int flags) { |
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38 | struct roar_vio_pipe * self; |
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39 | int rw = flags & (O_RDONLY|O_WRONLY|O_RDWR); |
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40 | |
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41 | if ( s0 == NULL || s1 == NULL ) |
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42 | return -1; |
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43 | |
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44 | if ( (self = malloc(sizeof(struct roar_vio_pipe))) == NULL ) |
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45 | return -1; |
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46 | |
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47 | memset(self, 0, sizeof(struct roar_vio_pipe)); |
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48 | |
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49 | self->refcount = 2; |
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50 | self->flags = flags; |
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51 | |
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52 | if ( type == ROAR_VIO_PIPE_TYPE_AUTO ) { |
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53 | #ifdef ROAR_TARGET_WIN32 |
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54 | type = ROAR_VIO_PIPE_TYPE_BUFFER; |
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55 | #else |
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56 | type = ROAR_VIO_PIPE_TYPE_SOCKET; |
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57 | #endif |
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58 | } |
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59 | |
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60 | self->type = type; |
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61 | |
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62 | switch (type) { |
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63 | case ROAR_VIO_PIPE_TYPE_BUFFER: |
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64 | // no buffers need to be set up here, |
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65 | // we handle the NULL pointer in the reader and writer func |
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66 | free(self); |
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67 | return -1; |
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68 | break; |
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69 | case ROAR_VIO_PIPE_TYPE_PIPE: |
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70 | if ( rw == O_RDWR || rw == O_RDONLY ) |
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71 | if ( pipe(self->b.p) == -1 ) { |
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72 | free(self); |
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73 | return -1; |
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74 | } |
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75 | if ( rw == O_RDWR || rw == O_WRONLY ) |
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76 | if ( pipe((self->b.p) + 2) == -1 ) { |
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77 | close(self->b.p[0]); |
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78 | close(self->b.p[1]); |
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79 | free(self); |
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80 | return -1; |
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81 | } |
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82 | break; |
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83 | case ROAR_VIO_PIPE_TYPE_SOCKET: |
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84 | if ( socketpair(AF_UNIX, SOCK_STREAM, 0, self->b.p) == -1 ) { |
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85 | free(self); |
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86 | return -1; |
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87 | } |
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88 | |
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89 | if ( rw == O_RDONLY ) { |
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90 | shutdown(self->b.p[0], SHUT_WR); |
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91 | shutdown(self->b.p[1], SHUT_RD); |
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92 | } else if ( rw == O_WRONLY ) { |
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93 | shutdown(self->b.p[0], SHUT_RD); |
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94 | shutdown(self->b.p[1], SHUT_WR); |
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95 | } |
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96 | break; |
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97 | default: |
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98 | free(self); |
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99 | return -1; |
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100 | } |
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101 | |
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102 | roar_vio_pipe_init(s0, self, flags); |
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103 | roar_vio_pipe_init(s1, self, flags); |
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104 | |
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105 | self->s0 = s0; |
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106 | |
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107 | return 0; |
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108 | } |
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109 | |
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110 | int roar_vio_pipe_init (struct roar_vio_calls * s, struct roar_vio_pipe * self, int flags) { |
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111 | if ( s == NULL || self == NULL ) |
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112 | return -1; |
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113 | |
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114 | memset(s, 0, sizeof(struct roar_vio_calls)); |
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115 | |
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116 | s->close = roar_vio_pipe_close; |
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117 | s->read = roar_vio_pipe_read; |
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118 | s->write = roar_vio_pipe_write; |
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119 | s->nonblock = roar_vio_pipe_nonblock; |
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120 | s->sync = roar_vio_pipe_sync; |
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121 | |
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122 | s->inst = (void*) self; |
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123 | |
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124 | if ( flags & O_NONBLOCK ) { |
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125 | roar_vio_pipe_nonblock(s, ROAR_SOCKET_NONBLOCK); |
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126 | } |
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127 | |
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128 | return 0; |
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129 | } |
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130 | |
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131 | int roar_vio_pipe_close (struct roar_vio_calls * vio) { |
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132 | struct roar_vio_pipe * self; |
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133 | int idx; |
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134 | |
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135 | if ( vio == NULL ) |
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136 | return -1; |
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137 | |
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138 | if ( (self = (struct roar_vio_pipe *)vio->inst) == NULL ) |
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139 | return -1; |
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140 | |
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141 | self->refcount--; |
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142 | |
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143 | switch (self->type) { |
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144 | case ROAR_VIO_PIPE_TYPE_BUFFER: |
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145 | // this will be a bit more complex as we need to change the flags, too. |
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146 | break; |
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147 | case ROAR_VIO_PIPE_TYPE_PIPE: |
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148 | switch (ROAR_VIO_PIPE_S(self, vio)) { |
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149 | case 0: |
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150 | close(self->b.p[0]); |
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151 | close(self->b.p[3]); |
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152 | self->b.p[0] = -1; |
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153 | self->b.p[3] = -1; |
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154 | break; |
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155 | case 1: |
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156 | close(self->b.p[1]); |
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157 | close(self->b.p[2]); |
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158 | self->b.p[1] = -1; |
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159 | self->b.p[2] = -1; |
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160 | break; |
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161 | } |
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162 | break; |
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163 | case ROAR_VIO_PIPE_TYPE_SOCKET: |
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164 | close(self->b.p[idx = ROAR_VIO_PIPE_S(self, vio)]); |
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165 | self->b.p[idx] = -1; |
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166 | break; |
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167 | } |
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168 | |
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169 | if ( ! self->refcount ) { |
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170 | free(self); |
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171 | } |
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172 | |
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173 | vio->inst = NULL; |
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174 | return 0; |
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175 | } |
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176 | |
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177 | int roar_vio_pipe_nonblock(struct roar_vio_calls * vio, int state) { |
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178 | return -1; |
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179 | } |
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180 | |
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181 | int roar_vio_pipe_sync (struct roar_vio_calls * vio) { |
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182 | // we may add fdatasync() calls here depending on the type |
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183 | // but in general they should not be needed on pipes. |
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184 | return 0; |
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185 | } |
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186 | |
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187 | ssize_t roar_vio_pipe_read (struct roar_vio_calls * vio, void *buf, size_t count) { |
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188 | struct roar_vio_pipe * self; |
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189 | |
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190 | if ( vio == NULL ) |
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191 | return -1; |
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192 | |
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193 | if ( (self = (struct roar_vio_pipe *)vio->inst) == NULL ) |
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194 | return -1; |
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195 | |
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196 | switch (self->type) { |
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197 | case ROAR_VIO_PIPE_TYPE_BUFFER: |
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198 | // this will be a bit more complex as we need to check the flags, too. |
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199 | break; |
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200 | case ROAR_VIO_PIPE_TYPE_PIPE: |
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201 | return read(self->b.p[ROAR_VIO_PIPE_S(self,vio)*2], buf, count); |
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202 | break; |
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203 | case ROAR_VIO_PIPE_TYPE_SOCKET: |
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204 | return read(self->b.p[ROAR_VIO_PIPE_S(self,vio)], buf, count); |
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205 | break; |
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206 | } |
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207 | |
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208 | return -1; |
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209 | } |
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210 | |
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211 | ssize_t roar_vio_pipe_write (struct roar_vio_calls * vio, void *buf, size_t count) { |
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212 | struct roar_vio_pipe * self; |
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213 | |
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214 | if ( vio == NULL ) |
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215 | return -1; |
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216 | |
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217 | if ( (self = (struct roar_vio_pipe *)vio->inst) == NULL ) |
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218 | return -1; |
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219 | |
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220 | switch (self->type) { |
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221 | case ROAR_VIO_PIPE_TYPE_BUFFER: |
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222 | // this will be a bit more complex as we need to check the flags, too. |
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223 | break; |
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224 | case ROAR_VIO_PIPE_TYPE_PIPE: |
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225 | return write(self->b.p[(ROAR_VIO_PIPE_SR(self,vio)*2)+1], buf, count); |
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226 | break; |
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227 | case ROAR_VIO_PIPE_TYPE_SOCKET: |
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228 | return write(self->b.p[ROAR_VIO_PIPE_S(self,vio)], buf, count); |
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229 | break; |
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230 | } |
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231 | |
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232 | return -1; |
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233 | } |
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234 | |
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235 | //ll |
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