1 | //libroaross.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010 |
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5 | * |
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6 | * This file is part of libroar a part of RoarAudio, |
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7 | * a cross-platform sound system for both, home and professional use. |
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8 | * See README for details. |
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9 | * |
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10 | * This file is free software; you can redistribute it and/or modify |
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11 | * it under the terms of the GNU General Public License version 3 |
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12 | * as published by the Free Software Foundation. |
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13 | * |
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14 | * libroar is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with this software; see the file COPYING. If not, write to |
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21 | * the Free Software Foundation, 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 "roaraudio.h" |
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36 | |
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37 | #if defined(ROAR_HAVE_OSS_BSD) || defined(ROAR_HAVE_OSS) |
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38 | #if defined(__OpenBSD__) || defined(__NetBSD__) |
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39 | #include <soundcard.h> |
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40 | #else |
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41 | #include <sys/soundcard.h> |
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42 | #endif |
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43 | #include <sys/ioctl.h> |
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44 | |
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45 | #ifdef ROAR_HAVE_H_SYS_TYPES |
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46 | #include <sys/types.h> |
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47 | #endif |
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48 | |
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49 | #ifdef ROAR_HAVE_H_FCNTL |
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50 | #include <fcntl.h> |
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51 | #endif |
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52 | |
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53 | #ifdef ROAR_HAVE_H_UNISTD |
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54 | #include <unistd.h> |
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55 | #endif |
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56 | |
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57 | #include <sys/stat.h> |
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58 | #include <dlfcn.h> |
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59 | |
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60 | #if defined(RTLD_NEXT) |
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61 | #define REAL_LIBC RTLD_NEXT |
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62 | #else |
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63 | #define REAL_LIBC ((void *) -1L) |
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64 | #endif |
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65 | |
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66 | #define _MAX_POINTER 8 |
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67 | |
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68 | // handle type: |
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69 | #define HT_NONE 0 |
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70 | #define HT_STREAM 1 |
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71 | #define HT_MIXER 2 |
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72 | |
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73 | struct session { |
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74 | int refc; |
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75 | struct roar_connection con; |
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76 | }; |
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77 | |
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78 | static struct session _session = {.refc = 0}; |
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79 | |
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80 | struct handle { |
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81 | int refc; // refrence counter |
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82 | struct session * session; |
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83 | int type; |
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84 | struct roar_stream stream; |
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85 | struct roar_vio_calls stream_vio; |
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86 | int stream_opened; |
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87 | }; |
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88 | |
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89 | static struct { |
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90 | int (*open)(const char *pathname, int flags, mode_t mode); |
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91 | int (*close)(int fd); |
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92 | ssize_t (*write)(int fd, const void *buf, size_t count); |
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93 | ssize_t (*read)(int fd, void *buf, size_t count); |
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94 | } _os; |
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95 | |
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96 | static struct pointer { |
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97 | int fh; |
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98 | struct handle * handle; |
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99 | } _ptr[_MAX_POINTER]; |
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100 | |
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101 | static void _init_os (void) { |
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102 | memset(&_os, 0, sizeof(_os)); |
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103 | |
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104 | _os.open = dlsym(REAL_LIBC, "open"); |
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105 | _os.close = dlsym(REAL_LIBC, "close"); |
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106 | _os.write = dlsym(REAL_LIBC, "write"); |
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107 | _os.read = dlsym(REAL_LIBC, "read"); |
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108 | } |
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109 | |
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110 | static void _init_ptr (void) { |
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111 | int i; |
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112 | |
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113 | for (i = 0; i < _MAX_POINTER; i++) { |
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114 | _ptr[i].fh = -1; |
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115 | } |
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116 | } |
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117 | |
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118 | static void _init (void) { |
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119 | static int inited = 0; |
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120 | |
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121 | if ( !inited ) { |
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122 | _init_os(); |
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123 | _init_ptr(); |
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124 | inited++; |
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125 | } |
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126 | } |
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127 | |
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128 | static int _open_dummy (void) { |
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129 | int p[2]; |
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130 | |
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131 | if ( pipe(p) == -1 ) |
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132 | return -1; |
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133 | |
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134 | close(p[1]); |
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135 | |
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136 | return p[0]; |
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137 | } |
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138 | |
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139 | static struct session * _open_session (char * server, char * name) { |
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140 | if ( _session.refc == 0 ) { |
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141 | |
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142 | if ( name == NULL ) |
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143 | name = "libroaross client"; |
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144 | |
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145 | if ( roar_simple_connect(&(_session.con), server, name) == -1 ) |
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146 | return NULL; |
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147 | |
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148 | _session.refc++; |
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149 | } else { |
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150 | _session.refc++; |
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151 | return &_session; |
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152 | } |
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153 | } |
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154 | |
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155 | static void _close_session(struct session * session) { |
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156 | if ( session == NULL ) |
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157 | return; |
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158 | |
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159 | session->refc--; |
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160 | |
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161 | if ( session->refc == 0 ) { |
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162 | roar_disconnect(&(session->con)); |
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163 | } |
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164 | } |
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165 | |
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166 | static struct handle * _open_handle(struct session * session) { |
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167 | struct handle * handle; |
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168 | |
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169 | if ( (handle = roar_mm_malloc(sizeof(struct handle))) == NULL ) |
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170 | return NULL; |
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171 | |
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172 | memset(handle, 0, sizeof(struct handle)); |
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173 | |
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174 | handle->refc = 1; |
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175 | handle->session = session; |
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176 | session->refc++; // TODO: better warp this |
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177 | handle->type = HT_NONE; |
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178 | roar_stream_new_empty(&(handle->stream)); |
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179 | |
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180 | return handle; |
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181 | } |
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182 | |
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183 | static void _close_handle(struct handle * handle) { |
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184 | if (handle == NULL) |
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185 | return; |
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186 | |
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187 | handle->refc--; |
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188 | |
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189 | if ( handle->refc == 0 ) { |
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190 | _close_session(handle->session); |
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191 | |
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192 | if ( handle->stream_opened ) |
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193 | roar_vio_close(&(handle->stream_vio)); |
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194 | |
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195 | roar_mm_free(handle); |
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196 | } |
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197 | } |
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198 | |
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199 | static int _open_stream (struct handle * handle) { |
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200 | return -1; |
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201 | } |
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202 | |
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203 | static struct pointer * _get_pointer_by_fh (int fh) { |
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204 | int i; |
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205 | |
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206 | for (i = 0; i < _MAX_POINTER; i++) { |
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207 | if ( _ptr[i].fh == fh ) |
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208 | return &(_ptr[i]); |
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209 | } |
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210 | |
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211 | return NULL; |
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212 | } |
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213 | |
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214 | static struct pointer * _open_pointer(struct handle * handle) { |
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215 | struct pointer * ret = _get_pointer_by_fh(-1); |
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216 | |
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217 | if ( ret == NULL ) |
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218 | return NULL; |
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219 | |
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220 | if ( (ret->fh = _open_dummy()) == -1 ) |
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221 | return NULL; |
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222 | |
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223 | ret->handle = handle; |
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224 | |
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225 | return ret; |
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226 | } |
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227 | |
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228 | static void _close_pointer(struct pointer * pointer) { |
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229 | if ( pointer == NULL ) |
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230 | return; |
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231 | |
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232 | _os.close(pointer->fh); |
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233 | |
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234 | pointer->fh = -1; |
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235 | |
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236 | _close_handle(pointer->handle); |
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237 | } |
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238 | |
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239 | // ------------------------------------- |
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240 | // emulated functions follow: |
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241 | // ------------------------------------- |
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242 | |
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243 | int open(const char *pathname, int flags, ...) { |
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244 | mode_t mode = 0; |
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245 | va_list args; |
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246 | |
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247 | _init(); |
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248 | |
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249 | if (flags & O_CREAT) { |
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250 | va_start(args, flags); |
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251 | mode = va_arg(args, mode_t); |
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252 | va_end(args); |
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253 | } |
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254 | |
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255 | return _os.open(pathname, flags, mode); |
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256 | } |
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257 | |
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258 | int close(int fd) { |
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259 | struct pointer * pointer; |
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260 | _init(); |
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261 | |
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262 | if ( (pointer = _get_pointer_by_fh(fd)) != NULL ) { |
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263 | _close_pointer(pointer); |
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264 | return 0; |
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265 | } |
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266 | |
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267 | return _os.close(fd); |
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268 | } |
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269 | |
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270 | ssize_t write(int fd, const void *buf, size_t count) { |
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271 | struct pointer * pointer; |
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272 | |
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273 | _init(); |
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274 | |
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275 | if ( (pointer = _get_pointer_by_fh(fd)) != NULL ) { |
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276 | if ( pointer->handle->type == HT_STREAM ) { |
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277 | if ( pointer->handle->stream_opened == 0 ) { |
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278 | if ( _open_stream(pointer->handle) == -1 ) { |
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279 | errno = EIO; |
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280 | return -1; |
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281 | } |
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282 | } |
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283 | return roar_vio_write(&(pointer->handle->stream_vio), buf, count); |
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284 | } else { |
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285 | errno = EINVAL; |
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286 | return -1; |
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287 | } |
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288 | } |
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289 | |
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290 | return _os.write(fd, buf, count); |
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291 | } |
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292 | |
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293 | ssize_t read(int fd, void *buf, size_t count) { |
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294 | struct pointer * pointer; |
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295 | |
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296 | _init(); |
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297 | |
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298 | if ( (pointer = _get_pointer_by_fh(fd)) != NULL ) { |
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299 | if ( pointer->handle->type == HT_STREAM ) { |
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300 | if ( pointer->handle->stream_opened == 0 ) { |
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301 | if ( _open_stream(pointer->handle) == -1 ) { |
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302 | errno = EIO; |
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303 | return -1; |
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304 | } |
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305 | } |
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306 | return roar_vio_read(&(pointer->handle->stream_vio), buf, count); |
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307 | } else { |
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308 | errno = EINVAL; |
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309 | return -1; |
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310 | } |
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311 | } |
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312 | |
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313 | return _os.read(fd, buf, count); |
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314 | } |
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315 | |
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316 | #endif |
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317 | |
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318 | //ll |
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