1 /* 2 * Mixer Interface - simple abstact module - base library (dlopen function) 3 * Copyright (c) 2005 by Jaroslav Kysela <perex (at) perex.cz> 4 * 5 * 6 * This library is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU Lesser General Public License as 8 * published by the Free Software Foundation; either version 2.1 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <unistd.h> 26 #include <string.h> 27 #include <fcntl.h> 28 #include <sys/ioctl.h> 29 #include <math.h> 30 #include <dlfcn.h> 31 #include "config.h" 32 #include "asoundlib.h" 33 #include "mixer_abst.h" 34 #include "sbase.h" 35 36 #define SO_PATH ALSA_PLUGIN_DIR "/smixer" 37 38 int mixer_simple_basic_dlopen(snd_mixer_class_t *class, 39 bclass_base_ops_t **ops) 40 { 41 struct bclass_private *priv = snd_mixer_sbasic_get_private(class); 42 const char *lib = "smixer-sbase.so"; 43 void (*initpriv)(snd_mixer_class_t *class, struct bclass_private *priv); 44 char *xlib, *path; 45 void *h; 46 int initflag = 0; 47 48 if (priv == NULL) { 49 priv = calloc(1, sizeof(*priv)); 50 if (priv == NULL) 51 return -ENOMEM; 52 initflag = 1; 53 } 54 path = getenv("ALSA_MIXER_SIMPLE_MODULES"); 55 if (!path) 56 path = SO_PATH; 57 xlib = malloc(strlen(lib) + strlen(path) + 1 + 1); 58 if (xlib == NULL) { 59 if (initflag) 60 free(priv); 61 return -ENOMEM; 62 } 63 strcpy(xlib, path); 64 strcat(xlib, "/"); 65 strcat(xlib, lib); 66 h = snd_dlopen(xlib, RTLD_NOW); 67 if (h == NULL) { 68 SNDERR("Unable to open library '%s'", xlib); 69 goto __error; 70 } 71 initpriv = dlsym(h, "alsa_mixer_sbasic_initpriv"); 72 if (initpriv == NULL) { 73 SNDERR("Symbol 'alsa_mixer_sbasic_initpriv' was not found in '%s'", xlib); 74 goto __error; 75 } 76 priv->ops.event = dlsym(h, "alsa_mixer_sbasic_event"); 77 if (priv->ops.event == NULL) { 78 SNDERR("Symbol 'alsa_mixer_sbasic_event' was not found in '%s'", xlib); 79 goto __error; 80 } 81 priv->ops.selreg = dlsym(h, "alsa_mixer_sbasic_selreg"); 82 if (priv->ops.selreg == NULL) { 83 SNDERR("Symbol 'alsa_mixer_sbasic_selreg' was not found in '%s'", xlib); 84 goto __error; 85 } 86 priv->ops.sidreg = dlsym(h, "alsa_mixer_sbasic_sidreg"); 87 if (priv->ops.sidreg == NULL) { 88 SNDERR("Symbol 'alsa_mixer_sbasic_sidreg' was not found in '%s'", xlib); 89 goto __error; 90 } 91 free(xlib); 92 if (initflag) 93 initpriv(class, priv); 94 priv->dl_sbase = h; 95 if (ops) 96 *ops = &priv->ops; 97 return 1; 98 99 __error: 100 if (initflag) 101 free(priv); 102 if (h == NULL) 103 snd_dlclose(h); 104 free(xlib); 105 return -ENXIO; 106 } 107
