1 | //mainloop-signal.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 | * The code (may) include prototypes and comments (and maybe |
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6 | * other code fragements) from libpulse*. They are mostly copyrighted by: |
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7 | * Lennart Poettering <poettering@users.sourceforge.net> and |
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8 | * Pierre Ossman <drzeus@drzeus.cx> |
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9 | * |
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10 | * This file is part of libroarpulse a part of RoarAudio, |
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11 | * a cross-platform sound system for both, home and professional use. |
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12 | * See README for details. |
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13 | * |
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14 | * This file is free software; you can redistribute it and/or modify |
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15 | * it under the terms of the GNU General Public License version 3 |
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16 | * as published by the Free Software Foundation. |
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17 | * |
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18 | * RoarAudio is distributed in the hope that it will be useful, |
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19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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21 | * GNU General Public License for more details. |
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22 | * |
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23 | * You should have received a copy of the GNU General Public License |
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24 | * along with this software; see the file COPYING. If not, write to |
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25 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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26 | * Boston, MA 02110-1301, USA. |
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27 | * |
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28 | * NOTE for everyone want's to change something and send patches: |
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29 | * read README and HACKING! There a addition information on |
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30 | * the license of this document you need to read before you send |
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31 | * any patches. |
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32 | * |
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33 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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34 | * or libpulse*: |
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35 | * The libs libroaresd, libroararts and libroarpulse link this libroar |
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36 | * and are therefore GPL. Because of this it may be illigal to use |
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37 | * them with any software that uses libesd, libartsc or libpulse*. |
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38 | */ |
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39 | |
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40 | #include <libroarpulse/libroarpulse.h> |
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41 | |
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42 | #define MAX_SIG 64 /* there is no way to find out */ |
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43 | |
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44 | typedef void (*pa_signal_cb_t) (pa_mainloop_api *api, pa_signal_event*e, int sig, void *userdata); |
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45 | |
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46 | struct pa_signal_event { |
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47 | int used; |
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48 | int sig; |
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49 | pa_signal_cb_t cb; |
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50 | void * userdata; |
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51 | }; |
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52 | |
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53 | static int _roar_pa_signal_inited = 0; |
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54 | |
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55 | static struct { |
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56 | pa_mainloop_api * api; |
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57 | pa_signal_event sig[MAX_SIG]; |
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58 | #ifdef ROAR_HAVE_PIPE |
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59 | int pipefh[2]; |
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60 | pa_io_event * io_event; |
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61 | #endif |
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62 | } _roar_pa_signal; |
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63 | |
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64 | static void _roar_pa_signal_iocb( |
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65 | #ifndef ROAR_HAVE_PIPE |
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66 | int sig |
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67 | #else |
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68 | pa_mainloop_api * a, |
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69 | pa_io_event * e, |
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70 | int fd, |
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71 | pa_io_event_flags_t f, |
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72 | void *userdata |
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73 | #endif |
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74 | ) { |
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75 | pa_signal_event * se; |
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76 | #ifdef ROAR_HAVE_PIPE |
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77 | int sig; |
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78 | size_t ret; |
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79 | |
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80 | ret = read(fd, &sig, sizeof(sig)); |
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81 | |
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82 | if ( ret != sizeof(sig) ) |
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83 | return; |
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84 | #endif |
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85 | |
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86 | if ( sig >= MAX_SIG ) |
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87 | return; |
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88 | |
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89 | se = &(_roar_pa_signal.sig[sig]); |
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90 | |
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91 | if ( !se->used ) |
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92 | return; |
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93 | |
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94 | ROAR_DBG("_roar_pa_signal_iocb(*): sig=%s(%i), se->cb=%p", strsignal(sig), sig, se->cb); |
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95 | |
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96 | if ( se->cb != NULL ) |
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97 | se->cb(_roar_pa_signal.api, se, sig, se->userdata); |
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98 | } |
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99 | |
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100 | static void _roar_pa_signal_handler (int sig) { |
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101 | #ifdef ROAR_HAVE_PIPE |
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102 | write(_roar_pa_signal.pipefh[1], &sig, sizeof(sig)); |
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103 | #else |
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104 | _roar_pa_signal_iocb(sig); |
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105 | #endif |
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106 | } |
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107 | |
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108 | /** Initialize the UNIX signal subsystem and bind it to the specified main loop */ |
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109 | int pa_signal_init(pa_mainloop_api *api) { |
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110 | |
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111 | if ( _roar_pa_signal_inited ) |
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112 | return -1; |
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113 | |
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114 | memset(&_roar_pa_signal, 0, sizeof(_roar_pa_signal)); |
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115 | |
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116 | _roar_pa_signal.api = api; |
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117 | |
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118 | #ifdef ROAR_HAVE_PIPE |
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119 | if ( pipe(_roar_pa_signal.pipefh) == -1 ) |
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120 | return -1; |
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121 | |
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122 | _roar_pa_signal.io_event = api->io_new(api, _roar_pa_signal.pipefh[0], PA_IO_EVENT_INPUT, _roar_pa_signal_iocb, NULL); |
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123 | #endif |
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124 | |
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125 | _roar_pa_signal_inited = 1; |
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126 | |
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127 | return 0; |
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128 | } |
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129 | |
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130 | /** Cleanup the signal subsystem */ |
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131 | void pa_signal_done(void) { |
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132 | int i; |
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133 | |
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134 | for (i = 0; i < MAX_SIG; i++) { |
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135 | _roar_pa_signal.sig[i].used = 0; |
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136 | } |
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137 | |
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138 | #ifdef ROAR_HAVE_PIPE |
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139 | _roar_pa_signal.api->io_free(_roar_pa_signal.io_event); |
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140 | #endif |
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141 | |
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142 | _roar_pa_signal_inited = 0; |
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143 | } |
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144 | |
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145 | /** Create a new UNIX signal event source object */ |
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146 | pa_signal_event* pa_signal_new(int sig, pa_signal_cb_t callback, void *userdata) { |
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147 | if ( !_roar_pa_signal_inited ) |
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148 | return NULL; |
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149 | |
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150 | if ( sig >= MAX_SIG ) |
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151 | return NULL; |
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152 | |
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153 | _roar_pa_signal.sig[sig].used = 1; |
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154 | _roar_pa_signal.sig[sig].sig = sig; |
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155 | _roar_pa_signal.sig[sig].cb = callback; |
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156 | _roar_pa_signal.sig[sig].userdata = userdata; |
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157 | |
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158 | signal(sig, _roar_pa_signal_handler); |
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159 | |
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160 | return &(_roar_pa_signal.sig[sig]); |
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161 | } |
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162 | |
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163 | /** Free a UNIX signal event source object */ |
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164 | void pa_signal_free(pa_signal_event *e) { |
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165 | if ( !_roar_pa_signal_inited ) |
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166 | return; |
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167 | |
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168 | if ( e == NULL ) |
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169 | return; |
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170 | |
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171 | signal(e->sig, SIG_DFL); |
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172 | |
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173 | e->used = 0; |
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174 | } |
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175 | |
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176 | /** Set a function that is called when the signal event source is destroyed. Use this to free the userdata argument if required */ |
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177 | void pa_signal_set_destroy(pa_signal_event *e, void (*callback) (pa_mainloop_api *api, pa_signal_event*e, void *userdata)); |
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178 | |
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179 | //ll |
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