src/pulsecore/modinfo.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5
   6   PulseAudio 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 the
   9   License, or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <ltdl.h>
  27
  28 #include <pulse/xmalloc.h>
  29
  30 #include <pulsecore/core-util.h>
  31 #include <pulsecore/log.h>
  32 #include <pulsecore/macro.h>
  33 #include <pulsecore/ltdl-helper.h>
  34
  35 #include "modinfo.h"
  36
  37 #define PA_SYMBOL_AUTHOR "pa__get_author"
  38 #define PA_SYMBOL_DESCRIPTION "pa__get_description"
  39 #define PA_SYMBOL_USAGE "pa__get_usage"
  40 #define PA_SYMBOL_VERSION "pa__get_version"
  41 #define PA_SYMBOL_DEPRECATED "pa__get_deprecated"
  42 #define PA_SYMBOL_LOAD_ONCE "pa__load_once"
  43
  44 pa_modinfo *pa_modinfo_get_by_handle(lt_dlhandle dl, const char *module_name) {
  45     pa_modinfo *i;
  46     const char* (*func)(void);
  47     pa_bool_t (*func2) (void);
  48
  49     pa_assert(dl);
  50
  51     i = pa_xnew0(pa_modinfo, 1);
  52
  53     if ((func = (const char* (*)(void)) pa_load_sym(dl, module_name, PA_SYMBOL_AUTHOR)))
  54         i->author = pa_xstrdup(func());
  55
  56     if ((func = (const char* (*)(void)) pa_load_sym(dl, module_name, PA_SYMBOL_DESCRIPTION)))
  57         i->description = pa_xstrdup(func());
  58
  59     if ((func = (const char* (*)(void)) pa_load_sym(dl, module_name, PA_SYMBOL_USAGE)))
  60         i->usage = pa_xstrdup(func());
  61
  62     if ((func = (const char* (*)(void)) pa_load_sym(dl, module_name, PA_SYMBOL_VERSION)))
  63         i->version = pa_xstrdup(func());
  64
  65     if ((func = (const char* (*)(void)) pa_load_sym(dl, module_name, PA_SYMBOL_DEPRECATED)))
  66         i->deprecated = pa_xstrdup(func());
  67
  68     if ((func2 = (pa_bool_t (*)(void)) pa_load_sym(dl, module_name, PA_SYMBOL_LOAD_ONCE)))
  69         i->load_once = func2();
  70
  71     return i;
  72 }
  73
  74 pa_modinfo *pa_modinfo_get_by_name(const char *name) {
  75     lt_dlhandle dl;
  76     pa_modinfo *i;
  77
  78     pa_assert(name);
  79
  80     if (!(dl = lt_dlopenext(name))) {
  81         pa_log("Failed to open module \"%s\": %s", name, lt_dlerror());
  82         return NULL;
  83     }
  84
  85     i = pa_modinfo_get_by_handle(dl, name);
  86     lt_dlclose(dl);
  87
  88     return i;
  89 }
  90
  91 void pa_modinfo_free(pa_modinfo *i) {
  92     pa_assert(i);
  93
  94     pa_xfree(i->author);
  95     pa_xfree(i->description);
  96     pa_xfree(i->usage);
  97     pa_xfree(i->version);
  98     pa_xfree(i->deprecated);
  99     pa_xfree(i);
 100 }